US3497005A - Sonic energy process - Google Patents
Sonic energy process Download PDFInfo
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- US3497005A US3497005A US619944A US3497005DA US3497005A US 3497005 A US3497005 A US 3497005A US 619944 A US619944 A US 619944A US 3497005D A US3497005D A US 3497005DA US 3497005 A US3497005 A US 3497005A
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- agent
- sonic energy
- shale
- oil
- recovery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/10—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing sonic or ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G15/00—Cracking of hydrocarbon oils by electric means, electromagnetic or mechanical vibrations, by particle radiation or with gases superheated in electric arcs
- C10G15/08—Cracking of hydrocarbon oils by electric means, electromagnetic or mechanical vibrations, by particle radiation or with gases superheated in electric arcs by electric means or by electromagnetic or mechanical vibrations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/003—Vibrating earth formations
Definitions
- This invention relates to processes for modifying the molecular structure of materials. More particularly the invention relates to processes for rupturing molecular bonds and forcing chemical reactions by means of sonic energy. The invention has particular application to recovery of shale oil in situ.
- the present invention provides a method for rupturing and otherwise affect molecular bonds at temperatures substantially below that of the prior art and further without the necessity for a separate catalyst.
- the method of this invention is useful for the recovery of shale oil in situ, cracking of crude petroleum oil in the absence of a catalyst, increasing the caloric value of organic fuels, removing pollutant products resulting from the combustion of fuels in combustion engines, causing unique chemical reactions to take place, for mining of metal in metal bearing ores, and secondary recovery of residual petroleum products.
- the present invention includes the process of subjecting materials to the action of sonic energy and in a modification of the process, contacting the materials with a carrier agent prior to the sonic treatment, drawing off a portion of the sonically treated materials, and recovering one of the materials as a product from the removed materials.
- the process has particular utility in the recovery of shale oil in situ and will be described in one embodiment in connection therewith.
- Shale oil is similar to petroleum. It includes in its composition hydrocarbons in addition to sulfur-, nitrogen-, and oxygen derivatives of hydrocarbons. Shale oil, how- 3,497,005 Patented Feb. 2 1, 1970 ever, is more like coal than liquid petroleum in that it is substantially a solid type material with almost no solubility in the common organic solvents nor in inorganic acids, bases, salts, and water. Shale oils are mainly found in subterranean deposits intimately associated with mineral matter. Generally oil shale contains at least mineral matter and in this respect is unlike coal which commonly contains only minor proportions of minerals. The organic components of oil shale is referred to as kerogen and may be pyrolyzed to form a flowable oil. This is the common method for recovery of the petroleum value of shale oil. There is general agreement that if kerogen could be made readily available from oil shale deposits, enough petroleum would be made available for the requirements of approximately the next thousand years.
- the process of this invention provides for flooding oil shale deposits with a carrier agent, preferably a liquid in which pyrolyzed products or kerogen are insoluble.
- a carrier agent preferably a liquid in which pyrolyzed products or kerogen are insoluble.
- Sonic probes are immersed into the shale layer and actuated to transmit sonic energy.
- a portion of the added agent is removed and treated to separate petroleum products which are suspended kerogen and pyrolyzed kerogen products.
- a continuous stream of the materials comprising the hydrocarbon fraction and the carrier agent are removed, treated to remove the hydrocarbon products, and the agent recycled to the oil shale deposit for additional treatment in a continuous operation.
- the carrier agent added to the oil shale deposit is water which may be indigenous to the area, such as spring water or a saline or brine solution.
- Other agents include miscible materials and solvents, such as acetic acid, nitric acid, aqua regia, sodium hydroxide, ammonium hydroxide, calcium hydroxide, benzene, toluene, carbon tetrachloride, heptane, nonane, lower ketones and aldehydes, and similar materials and mixtures thereof.
- a limitation on the use of these carrier agents is that pyrolyzed shale oil hydrocar bons may be soluble therein resulting in additional recovery problems.
- solubilization of the hydrocarbon fraction in a carrier agent improves the yield of the product and may be justifiable. This consideration however, is not a limitation upon this invention.
- the sonic energy is supplied in any convenient form and preferably by the activation of one or more transducer probes which have been placed in oil shale deposits on location in the subterranean chamber.
- the probe may be inserted into the chamber by means of passing the probe through a previously drilled shaft.
- the sonic energy used is preferably in the ultrasonic range with the recovery efficiency being proportional to the intensity of the sonic energy used. It is noted, however, that the cost of producing high intensity sonic energy is generally considerable and the economics of the situation may not justify expenditure of the full theoretical power needed for high speed operation. Since recovery of the hydrocarbon portion is at a slower rate when a lower intensity sonic energy is used, a balance determines the optimum operation rate.
- Frequencies of the order of about 10-1000 kilocycles per second are effective for recovery of hydrocarbons with a minimum of 16 kilocycles per second being needed for best results. Higher frequencies are also operative, however, the cost of reaching these frequencies may not be justified since the rate of the hydrocarbon recovery does not increase in the same proportion at higher levels.
- the sonic power requirement is in the order of 500-5000 watts per square centimeter or greater, of transmitting cross-sectional area.
- the process requires no additional costs for raw materials since available water is preferred. Storage space, however, is provided and the proportion thereof is a function of the hydrocarbon material removed. Equally, the recovered carrier agent and recovered hydrocarbon fraction can be shipped or pumped to a recovery facility at a central or existing location.
- An additional advantage of this process is that the heat generated by the activated probes in the shale deposit is used to furnish a portion of the generator power required. Heat may be recovered by exchange thereof in units at the surface in conventional manner as by heat exchangers and turbines.
- the hydrocarbon materials and carrier agent may be removed from subterranean locations by pump means or by pressure means well known in the petroleum recovery arts.
- emulsifying agent or surfactant as otherwise generally known
- the emulsifying agent may be any of the well known available materials which include detergents, soaps, amine salts, quaternary ammonium compounds and polyether alcohols, sulfonates and sulfates. Specific examples include: diamyl sodium sulfosuccinate, sorbitan monolaurate, sodium Z-ethyl-n-heptyl sulfate, and the like.
- Recovered yields of shale oil are substantially improved when the process is carried out in fragmented oil shale. Due to the considerableity of the oil shale deposits, conventional methods of fragmentation such as standard explosives have not provided a generally satisfactory solution. However, detonation of nuclear devices for creation of subterranean caverns provides a method for causing the oil shale to fragmentize and fissure. Lekas et al. have described a process for fracturing oil shale with nuclear explosives with an accompanying chimney effect in the subterranean cavern. The instant invention is used to advantage in such fragmentized oil shale by carrying out the process described in the resulting chimney.
- the carrier agent can be eliminated since the heat of the atomic detonation is suflicient to liquify freed hydrocarbons at substantial distances from the blast center.
- the hydrocarbon fraction is recovered by merely pumping the liquid hydrocarbons to the surface as disclosed by Lekas et al. This invention provides a unique method for more rapid and more efficient recovery of the shale oil.
- Recovery of the hydrocarbon product from the added carrier agent is readily accomplished by means of quiescent storage of the removed fluids wherein the hydrocarbon fraction or portion separates from the carrier agent on standing.
- the recovery operation is simplified by merely skimming the lighter material from the top of the storage container or conversely removing the heavy material as the bottom layer.
- Other recovery procedures include congealing, liquid-liquid extraction, distillation or any other known method. Apparatus for these operations are well known.
- the molecular weight of the recovered hydrocarbon product is determined and the various hydrocarbon fractions present therein are analyzed.
- the recovered hydrocarbon product has therein approximately up to about 30% by weight of pyrolyzed kerogen, including ring and linear hydrocarbons.
- pyrolyzed kerogen including ring and linear hydrocarbons.
- such materials comprise benzene and derivatives thereof and aliphatic compounds such as C -C alkyl and unsaturated molecules,
- Oxy and sulfur derivatives of these compounds are also present as well as amines derivatives.
- the described process also has application: in recovery of petroleum and hydrocarbon values from tar sands by similar process; in the secondary recovery of petroleum residual oil by transmitting sonic energy into a strata of residual crude which has been flooded with a carrier agent such as water or brine and recovery as in the shale oil process; and, also in the recovery of asphaltic oil by similar process.
- the proportion of the pyrolyzed fraction is a function of the frequency and intensity of the sonic energy used and the length of time of exposure to the sonic energy; the greater the level of sonic energy used, the greater the proportion of cracked hydrocarbons present in the product.
- a carrier agent such as water is admixed with the crude in the cracking tower and subject to sonic energy while being maintained under quiescent conditions.
- a preferred embodiment includes a continuous process wherein a portion of the agent is removed subsequent to being treated by the sonic energy and, thereafter eifectuating recovery of the petroleum portion from the removed agent.
- Continuous operation is highly desirable as for example, by continuously feeding fresh agent, continuously transmitting sonic energy into the system and continuously withdrawing a portion of the agent layer, and recovering the petroleum portion therefrom.
- an emulsifying agent as described is included in the agent.
- the recovered petroleum portion there is a high proportion of cracked hydrocarbon molecules substantially within the C C group of aliphatic compounds.
- higher molecular weight organic fuels are treated as described above with a carrier agent and sonic energy.
- the recovered product therefrom contains lower molecular weight molecules than originally found in the fuel. Since lower molecular weight hydrocarbons provide more caloric energy for a given weight than do higher molecular weight molecules for the same weight of fuel, this process provides a simplified method for imparting greater caloric energy to fuels.
- the sonic energy may be put into the fuel directly at the use site without the use of the carrier agent.
- This embodiment provides the advantage of transporting a relatively low-energy, low-volatility fuel, and converting that fuel into a high-volatility fuel having a higher caloric content immediately prior to its use. This also overcomes the problem of volatilization losses resulting from the handling of low molecular weight fuels.
- Another embodiment of this invention includes a method and apparatus for removing higher molecular weight exhaust products of combustion from combustion engines and particularly internal combustion engines.
- the products of combustion are mainly hot gases which may contain molecular structures having carcinogenic properties, as well as other atmospheric pollutants.
- Additives to the fuel generally contain organometallic compounds which add to the undesirable features of the combustion products.
- the hot exhaust gases are passed through a chamber wherein a sonic probe transmits sonic energy into the gas stream.
- a carrier agent is present at the chamber outlet such as water or an adsorbing agent such as carbon, i.e., granulated activated charcoal.
- Sonic energy causes the molecular rupture of the pollutants into lower molecular weight products thus facilitating more efficient retention of the combustion products by the agent; in particular, it retains lower molecular weight products resulting from the sonic energy treatment.
- a portion of the agent is preferably continuously removed, and separated into the agent and a concentrate of the hydrocarbon fuel, pyrolyzed products thereof, and fuel additives as described. Recovered combustible products may be recycled to the combustion engine for utilization together with the original fuel. Where a solid agent is used, removal and purification is required less frequently since the adsorbent capacity of the solid agent is substantially greater than the retention capacity of a fluid agent.
- the capability of sonic energy to rupture molecular bonds is used to cause unique chemical reactions to proceed.
- alkanes are reacted with organic acids to form the esters and hydrogen gas.
- organic acids include organic acids, and mono, di-, and poly-carboxylic acids of both the saturated and unsaturated type having up to 24 and more carbon atoms in its molecule in the monomeric state. Above about 24 carbon atoms the material is difficult to handle in this manner since it is a harder solid.
- Polymeric carboxylic acids may be used to advantage as may also polymeric alkanes such as polyethylene, polypropylene, and mixtures thereof.
- acids examples include acetic, butyric, acrylic, methacrylic, stearic, rnaleic, phthalic, glutaric, pimelic, succinic, sebacic acid and the like.
- Polyacrylic and polymethacrylic acid are also used to advantage. Also operative are multifunctional organic molecules having an acid moiety thereon such as hydroxy acids.
- the process comprises admixing the reactants in a vessel and submitting the combination to sonic energy.
- acetic acid and butane were reacted to form butyl acetate by treating an admixture of these compounds in a vessel with ultrasonic energy havin a frequency of 28.3 kilocycles per second and an intensity of between 50-10O watts per square centimeter while maintaining a pressure of about 100 pounds per square inch and a temperature of 572 F.
- metal containing ores are mined to free the metal by flooding a mine, such as a gold mine, with a carrier agent such as water.
- a mine such as a gold mine
- the ore is then subjected to sonic energy, as described above.
- the disruptive forces due to the sonic energy input tends to free the metal from the mineral matter and facilitates recovery of the metal.
- the process is less efficient, and recovery is made by mechanically separating the loosened metal.
- Shale is impermeable and has an extremely low porosity thereby lending itself to be used as a piezoelectric transducer.
- Slant channels are drilled into a suitable shale strata and are flooded with a carrier agent as described into which a surfactant has been added.
- T ransmission lines are connected to the shale.
- Generators are activated and the electrical energy is passed through the transmission lines into the shale strata.
- the shale strata resonates at a frequency peculiar to itself and destroys itself.
- the kerogen and/or petroleum product pass into the agent and the agent is forced to the surface by displacement with additional agent. The products are separated from the agent and recycled.
- EXAMPLE 1 A 3 lb. sample of oil shale containing about 60% inorganic mineral material, the balance being kerogen, is placed in a stainless steel chamber approximately 6 inches cube. Water and sorbitan monolaurate surfactant are added to the container so that the entire sample is immersed. A water inlet line is provided in the top of the chamber and a discharge line is provided near the bottom of the chamber. Transducer probe elements are placed into cavities in the shale oil and secured in place. Ap-
- Samples taken in the lower frequency range have minor proportions of hydrocarbon products. As the frequency level is raised, however, the proportion of hydrocarbon products is increased. Over about 1000 kilocycles per second, the rate of increase of the hydrocarbon products falls off and is no longer in about proportional relation with increased frequency.
- the hydrocarbon product contains both aromatic and aliphatic compounds, and oxygen, sulphur, and nitrogen derivatives thereof. Also, the proportion of polymerized and higher molecular weight materials significantly decreases with increasing frequency. Added surfactants improve recovery yields.
- EXAMPLE 2 This example describes cracking of crude petroleum oil with sonic energy in the absence of catalyst. Into a simulated cracking tower of laboratory scale is added crude oil to about one-third of the capacity. Water is added to an additional one-third of the capacity. Tem peratures are increased within the range of l00200 F. and maintained. Sonic probes are inserted into the oilwater system. The process steps described above for the shale oil recovery are repeated in this example by taking samples at various energy levels. The hydrocarbon product analysis shows a substantially high proportion of C C aliphatic compounds in general proportional relationship to the frequency level and the time of exposure.
- a carrier agent is not used and the crude oil is sampled after various periods of exposure to the sonic energy.
- the sampled crude has a similar proportion of a pyrolyzed hydrocarbons as found in the carrier agent samples described.
- a fuel oil comprising substantially C -C aliphatic hydrocarbons is treated with sonic energy by means of a probe within the frequency range described above for periods of time in the range of between l 60 minutes per pound of fuel.
- the fuel is analyzed. With increasing time, frequency, and intensity, the proportion of C C aliphatic hydrocarbons is increased.
- the higher molecular weight fuel is continuously fed into a transducer containing chamber. The transducer is activiated and portions of the fuel are continuously removed therefrom. The removed fuel has a substantially increased proportion of lower molecular weight hydrocarbons therein. The longer the fuel is exposed to the activated transducer and also the higher the frequency of the sonic energy introduced into the fuel, the greater is the proportion of lower molecular weight material.
- EXAMPLE 4 combustion product of fuels of an internal combustion engine such as gasoline engine, are passed through a transducer element containing chamber at the outlet of which is placed charcoal.
- the transducer is activated to emit sonic energy in the range of between 101500 kilocycles per second.
- the exhaust fumes are retained by the charcoal.
- Analysis of the fumes retained by the charcoal shows a substantial proportion of lower molecular weight products compared with the combusition products as directly exhausted from the engine prior to the passage through the sonic chamber.
- water is substituted for the charcoal. Results analogous to the charcoal system are obtained.
- a recycle line is included prior to the charcoal or water.
- the recycle line feeds a major portion of the fumes directly back into the engine for further combustion.
- sonic probes are placed in cavities in subterranean strata containing either or both natural gas and residual crude oil which is trapped in the pores of the strata.
- the probes are activated and sonic energy in the range of between -1500 kilocycles per second is transmitted into the hydrocarbon containing strata.
- the sonic energy in proportion to its frequency, intensity and duration causes fissures and cracks the strata formation, thereby freeing the hydrocarbon for more efficient secondary recovery by usual methods such as by pumping or pressurization recovery.
- said material is oil shale comprising kerogen and mineral matter and said portion of said removed material is substantially free of said mineral matter;
- said agent comprises water
- said sonic energy is ultrasonic energy having a frequency of at least 16 kilocycles per second.
- said material is petroleum crude oil
- said agent comprises water
- said sonic energy is ultrasonic energy having a frequency of at least 16 kilocycles per second.
- said material is a higher molecular weight organic fuel
- said agent comprises water
- said sonic energy is ultrasonic energy having a.
- said material is the product of combustion of the fuel in a combustion engine
- said agent is selected from the group consisting of a water solution and carbon
- said sonic energy is ultrasonic energy having a frequency of at least 16 kilocycles per second.
- a process for recovering shale oil in situ from subterranean oil shale deposits comprising the steps of:
- a process for recovering shale oil in situ from subterranean oil shale deposits comprising the steps of:
- a process for recovering metal from metal-containing ore comprising contacting said metal-containing ore with a carrier agent and then subjecting said metalcontaining ore to sonic energy having a frequency of at least 10 kilocycles per second causing molecular bonds between said metal-containing ore to rupture; and then separating said ruptured metal-containing ore and agent from each other.
- a process for freeing trapped natural gas and residual crude oil from pores in subterranean strata comprising the steps of contacting crude oil or natural gas containing subterranean strata with a carrier agent for said oil or gas and subjecting said subterranean strata containing crude oil or natural gas to sonic energy having a frequency of at least 10 kilocycles per second causing molecular bonds between said strata material to rupture and recovering said freed natural gas or crude oil.
Description
United States Patent O 3,497,005 SONIC ENERGY PROCESS Arnold H. Pelopsky and Dan T. Felix, Monument, and Gary N. Herbert, Colorado Springs, (3050., assignors to Resources Research & Development Corporation, Colorado Springs, Colo., a corporation of Colorado No Drawing. Filed Mar. 2, 1967, Ser. No. 619,944 Int. Cl. E2111 43/25; Elle 37/20; BOlj 1/12 U.S. Cl. 166-247 23 Claims ABSTRACT OF THE DISCLOSURE A process for rupturing molecular bonds in a material using sonic energy. The material is subjected to sonic energy, and in a modification of the process it may be contacted with a carrier agent prior to being subjected to the sonic energy.
DESCRIPTION OF INVENTION This invention relates to processes for modifying the molecular structure of materials. More particularly the invention relates to processes for rupturing molecular bonds and forcing chemical reactions by means of sonic energy. The invention has particular application to recovery of shale oil in situ.
Although sonic energy has been used to affect cracking of molecular weight of petroleum products, it has been necessary to cause the reactions to take place in the presence of separate catalytic agents, and at elevated temperatures. For example, in Patent No. 2,578,377, there is disclosed a hydrocarbon cracking process wherein a catalyst-hydrocarbon mixture is exposed to sonic energy and temperatures in the range of 600-lO0 F. Such processes suffer from limitations including high temperature requirements, and further that expensive catalyst must still be used. The hoped for improved efficiency attributable to sonic energy in such processes have not resulted in commercial adaptations thereof.
The present invention provides a method for rupturing and otherwise affect molecular bonds at temperatures substantially below that of the prior art and further without the necessity for a separate catalyst. The method of this invention is useful for the recovery of shale oil in situ, cracking of crude petroleum oil in the absence of a catalyst, increasing the caloric value of organic fuels, removing pollutant products resulting from the combustion of fuels in combustion engines, causing unique chemical reactions to take place, for mining of metal in metal bearing ores, and secondary recovery of residual petroleum products.
Briefly stated, the present invention includes the process of subjecting materials to the action of sonic energy and in a modification of the process, contacting the materials with a carrier agent prior to the sonic treatment, drawing off a portion of the sonically treated materials, and recovering one of the materials as a product from the removed materials.
The process has particular utility in the recovery of shale oil in situ and will be described in one embodiment in connection therewith.
Shale oil is similar to petroleum. It includes in its composition hydrocarbons in addition to sulfur-, nitrogen-, and oxygen derivatives of hydrocarbons. Shale oil, how- 3,497,005 Patented Feb. 2 1, 1970 ever, is more like coal than liquid petroleum in that it is substantially a solid type material with almost no solubility in the common organic solvents nor in inorganic acids, bases, salts, and water. Shale oils are mainly found in subterranean deposits intimately associated with mineral matter. Generally oil shale contains at least mineral matter and in this respect is unlike coal which commonly contains only minor proportions of minerals. The organic components of oil shale is referred to as kerogen and may be pyrolyzed to form a flowable oil. This is the common method for recovery of the petroleum value of shale oil. There is general agreement that if kerogen could be made readily available from oil shale deposits, enough petroleum would be made available for the requirements of approximately the next thousand years.
The process of this invention provides for flooding oil shale deposits with a carrier agent, preferably a liquid in which pyrolyzed products or kerogen are insoluble. Sonic probes are immersed into the shale layer and actuated to transmit sonic energy. A portion of the added agent is removed and treated to separate petroleum products which are suspended kerogen and pyrolyzed kerogen products. In the preferred embodiment of this invention, a continuous stream of the materials comprising the hydrocarbon fraction and the carrier agent, are removed, treated to remove the hydrocarbon products, and the agent recycled to the oil shale deposit for additional treatment in a continuous operation.
As to the carrier agent added to the oil shale deposit, the preferred and most economical material is water which may be indigenous to the area, such as spring water or a saline or brine solution. Other agents include miscible materials and solvents, such as acetic acid, nitric acid, aqua regia, sodium hydroxide, ammonium hydroxide, calcium hydroxide, benzene, toluene, carbon tetrachloride, heptane, nonane, lower ketones and aldehydes, and similar materials and mixtures thereof. A limitation on the use of these carrier agents is that pyrolyzed shale oil hydrocar bons may be soluble therein resulting in additional recovery problems. However, solubilization of the hydrocarbon fraction in a carrier agent improves the yield of the product and may be justifiable. This consideration however, is not a limitation upon this invention.
The sonic energy is supplied in any convenient form and preferably by the activation of one or more transducer probes which have been placed in oil shale deposits on location in the subterranean chamber. The probe may be inserted into the chamber by means of passing the probe through a previously drilled shaft. The sonic energy used is preferably in the ultrasonic range with the recovery efficiency being proportional to the intensity of the sonic energy used. It is noted, however, that the cost of producing high intensity sonic energy is generally considerable and the economics of the situation may not justify expenditure of the full theoretical power needed for high speed operation. Since recovery of the hydrocarbon portion is at a slower rate when a lower intensity sonic energy is used, a balance determines the optimum operation rate. Frequencies of the order of about 10-1000 kilocycles per second are effective for recovery of hydrocarbons with a minimum of 16 kilocycles per second being needed for best results. Higher frequencies are also operative, however, the cost of reaching these frequencies may not be justified since the rate of the hydrocarbon recovery does not increase in the same proportion at higher levels. The sonic power requirement is in the order of 500-5000 watts per square centimeter or greater, of transmitting cross-sectional area.
The process requires no additional costs for raw materials since available water is preferred. Storage space, however, is provided and the proportion thereof is a function of the hydrocarbon material removed. Equally, the recovered carrier agent and recovered hydrocarbon fraction can be shipped or pumped to a recovery facility at a central or existing location.
An additional advantage of this process is that the heat generated by the activated probes in the shale deposit is used to furnish a portion of the generator power required. Heat may be recovered by exchange thereof in units at the surface in conventional manner as by heat exchangers and turbines.
The hydrocarbon materials and carrier agent may be removed from subterranean locations by pump means or by pressure means well known in the petroleum recovery arts.
To advantage, there is admixed with the carrier agent an emulsifying agent (or surfactant as otherwise generally known) to facilitate separation of the hydrocarbon portion of the shale oil from the mineral deposits and to promote emulsification of the hydrocarbons in the carrier agent under the influence of sonic energy. The emulsifying agent may be any of the well known available materials which include detergents, soaps, amine salts, quaternary ammonium compounds and polyether alcohols, sulfonates and sulfates. Specific examples include: diamyl sodium sulfosuccinate, sorbitan monolaurate, sodium Z-ethyl-n-heptyl sulfate, and the like.
Recovered yields of shale oil are substantially improved when the process is carried out in fragmented oil shale. Due to the enormity of the oil shale deposits, conventional methods of fragmentation such as standard explosives have not provided a generally satisfactory solution. However, detonation of nuclear devices for creation of subterranean caverns provides a method for causing the oil shale to fragmentize and fissure. Lekas et al. have described a process for fracturing oil shale with nuclear explosives with an accompanying chimney effect in the subterranean cavern. The instant invention is used to advantage in such fragmentized oil shale by carrying out the process described in the resulting chimney. In a modification of this process, the carrier agent can be eliminated since the heat of the atomic detonation is suflicient to liquify freed hydrocarbons at substantial distances from the blast center. The hydrocarbon fraction is recovered by merely pumping the liquid hydrocarbons to the surface as disclosed by Lekas et al. This invention provides a unique method for more rapid and more efficient recovery of the shale oil.
Recovery of the hydrocarbon product from the added carrier agent is readily accomplished by means of quiescent storage of the removed fluids wherein the hydrocarbon fraction or portion separates from the carrier agent on standing. The recovery operation is simplified by merely skimming the lighter material from the top of the storage container or conversely removing the heavy material as the bottom layer. Other recovery procedures include congealing, liquid-liquid extraction, distillation or any other known method. Apparatus for these operations are well known.
The molecular weight of the recovered hydrocarbon product is determined and the various hydrocarbon fractions present therein are analyzed. The recovered hydrocarbon product has therein approximately up to about 30% by weight of pyrolyzed kerogen, including ring and linear hydrocarbons. For example, such materials comprise benzene and derivatives thereof and aliphatic compounds such as C -C alkyl and unsaturated molecules,
1 Lekas and Carpenter Fracturing Oil Shale With Nuclear Explosives for I11Situ Retorting, Quarterly of the Colorado School of Mines.
and also polymeric structures. Oxy and sulfur derivatives of these compounds are also present as well as amines derivatives.
The described process also has application: in recovery of petroleum and hydrocarbon values from tar sands by similar process; in the secondary recovery of petroleum residual oil by transmitting sonic energy into a strata of residual crude which has been flooded with a carrier agent such as water or brine and recovery as in the shale oil process; and, also in the recovery of asphaltic oil by similar process. The proportion of the pyrolyzed fraction is a function of the frequency and intensity of the sonic energy used and the length of time of exposure to the sonic energy; the greater the level of sonic energy used, the greater the proportion of cracked hydrocarbons present in the product.
The process of this invention is also useful in other areas Where rupturing of molecular bonds is required in order to properly or efficiently operate a process. For example, in the cracking of petroleum crude oil, a carrier agent such as water is admixed with the crude in the cracking tower and subject to sonic energy while being maintained under quiescent conditions. As described above, a preferred embodiment includes a continuous process wherein a portion of the agent is removed subsequent to being treated by the sonic energy and, thereafter eifectuating recovery of the petroleum portion from the removed agent. Continuous operation is highly desirable as for example, by continuously feeding fresh agent, continuously transmitting sonic energy into the system and continuously withdrawing a portion of the agent layer, and recovering the petroleum portion therefrom. In order to facilitate migration of the petroleum fraction into the agent layer an emulsifying agent as described is included in the agent. In the recovered petroleum portion, there is a high proportion of cracked hydrocarbon molecules substantially within the C C group of aliphatic compounds.
In another embodiment of this invention, higher molecular weight organic fuels are treated as described above with a carrier agent and sonic energy. The recovered product therefrom contains lower molecular weight molecules than originally found in the fuel. Since lower molecular weight hydrocarbons provide more caloric energy for a given weight than do higher molecular weight molecules for the same weight of fuel, this process provides a simplified method for imparting greater caloric energy to fuels. In one application of this embodiment of the invention, the sonic energy may be put into the fuel directly at the use site without the use of the carrier agent. This embodiment provides the advantage of transporting a relatively low-energy, low-volatility fuel, and converting that fuel into a high-volatility fuel having a higher caloric content immediately prior to its use. This also overcomes the problem of volatilization losses resulting from the handling of low molecular weight fuels.
Another embodiment of this invention includes a method and apparatus for removing higher molecular weight exhaust products of combustion from combustion engines and particularly internal combustion engines. The products of combustion are mainly hot gases which may contain molecular structures having carcinogenic properties, as well as other atmospheric pollutants. Additives to the fuel generally contain organometallic compounds which add to the undesirable features of the combustion products. In this process the hot exhaust gases are passed through a chamber wherein a sonic probe transmits sonic energy into the gas stream. Preferably, a carrier agent is present at the chamber outlet such as water or an adsorbing agent such as carbon, i.e., granulated activated charcoal. Sonic energy causes the molecular rupture of the pollutants into lower molecular weight products thus facilitating more efficient retention of the combustion products by the agent; in particular, it retains lower molecular weight products resulting from the sonic energy treatment. A portion of the agent is preferably continuously removed, and separated into the agent and a concentrate of the hydrocarbon fuel, pyrolyzed products thereof, and fuel additives as described. Recovered combustible products may be recycled to the combustion engine for utilization together with the original fuel. Where a solid agent is used, removal and purification is required less frequently since the adsorbent capacity of the solid agent is substantially greater than the retention capacity of a fluid agent.
In another embodiment of this invention, the capability of sonic energy to rupture molecular bonds is used to cause unique chemical reactions to proceed. For examp e, alkanes are reacted with organic acids to form the esters and hydrogen gas. Among the reactants are included C -C alkanes, and mono, di-, and poly-carboxylic acids of both the saturated and unsaturated type having up to 24 and more carbon atoms in its molecule in the monomeric state. Above about 24 carbon atoms the material is difficult to handle in this manner since it is a harder solid. Polymeric carboxylic acids may be used to advantage as may also polymeric alkanes such as polyethylene, polypropylene, and mixtures thereof. Examples of acids include acetic, butyric, acrylic, methacrylic, stearic, rnaleic, phthalic, glutaric, pimelic, succinic, sebacic acid and the like. Polyacrylic and polymethacrylic acid are also used to advantage. Also operative are multifunctional organic molecules having an acid moiety thereon such as hydroxy acids.
The process comprises admixing the reactants in a vessel and submitting the combination to sonic energy. In one example, acetic acid and butane were reacted to form butyl acetate by treating an admixture of these compounds in a vessel with ultrasonic energy havin a frequency of 28.3 kilocycles per second and an intensity of between 50-10O watts per square centimeter while maintaining a pressure of about 100 pounds per square inch and a temperature of 572 F.
In another embodiment, metal containing ores are mined to free the metal by flooding a mine, such as a gold mine, with a carrier agent such as water. The ore is then subjected to sonic energy, as described above. The disruptive forces due to the sonic energy input tends to free the metal from the mineral matter and facilitates recovery of the metal. In the absence of the carrier agent, the process is less efficient, and recovery is made by mechanically separating the loosened metal.
The following is a related embodiment of the process described. Shale is impermeable and has an extremely low porosity thereby lending itself to be used as a piezoelectric transducer. Slant channels are drilled into a suitable shale strata and are flooded with a carrier agent as described into which a surfactant has been added. T ransmission lines are connected to the shale. Generators are activated and the electrical energy is passed through the transmission lines into the shale strata. The shale strata resonates at a frequency peculiar to itself and destroys itself. The kerogen and/or petroleum product pass into the agent and the agent is forced to the surface by displacement with additional agent. The products are separated from the agent and recycled.
In the examples that follow, and elsewhere herein, the proportions are by Weight unless specifically stated to the contrary.
EXAMPLE 1 A 3 lb. sample of oil shale containing about 60% inorganic mineral material, the balance being kerogen, is placed in a stainless steel chamber approximately 6 inches cube. Water and sorbitan monolaurate surfactant are added to the container so that the entire sample is immersed. A water inlet line is provided in the top of the chamber and a discharge line is provided near the bottom of the chamber. Transducer probe elements are placed into cavities in the shale oil and secured in place. Ap-
propriate pumps are positioned in the water inlet and discharged lines for circulation purposes. The discharge line empties into a storage chamber of approximately 10 cubic feet. The storage container is provided with drawofif lines for the layers of the hydrocarbon materials as they separate therein. The transducer element is activated and samples of water are transported from the water discharge line to the storage chamber. Fresh water is added (or recovered water from the storage-separation container) through the water inlet line to replenish the samples removed. The sonic energy input is varied over the range of 10-1500 kilocycles per second. During the operation of the process, the temperature rises due to the vibrational energy put into the system.
Samples taken in the lower frequency range have minor proportions of hydrocarbon products. As the frequency level is raised, however, the proportion of hydrocarbon products is increased. Over about 1000 kilocycles per second, the rate of increase of the hydrocarbon products falls off and is no longer in about proportional relation with increased frequency.
The hydrocarbon product contains both aromatic and aliphatic compounds, and oxygen, sulphur, and nitrogen derivatives thereof. Also, the proportion of polymerized and higher molecular weight materials significantly decreases with increasing frequency. Added surfactants improve recovery yields.
EXAMPLE 2 This example describes cracking of crude petroleum oil with sonic energy in the absence of catalyst. Into a simulated cracking tower of laboratory scale is added crude oil to about one-third of the capacity. Water is added to an additional one-third of the capacity. Tem peratures are increased within the range of l00200 F. and maintained. Sonic probes are inserted into the oilwater system. The process steps described above for the shale oil recovery are repeated in this example by taking samples at various energy levels. The hydrocarbon product analysis shows a substantially high proportion of C C aliphatic compounds in general proportional relationship to the frequency level and the time of exposure.
In a modification of this example, a low molecular weight solvent, hexane, is substituted for the water. Similar good results are obtained.
In another modification, a carrier agent is not used and the crude oil is sampled after various periods of exposure to the sonic energy. The sampled crude has a similar proportion of a pyrolyzed hydrocarbons as found in the carrier agent samples described.
EXAMPLE 3 A fuel oil comprising substantially C -C aliphatic hydrocarbons is treated with sonic energy by means of a probe within the frequency range described above for periods of time in the range of between l 60 minutes per pound of fuel. At the end of various periods of time, the fuel is analyzed. With increasing time, frequency, and intensity, the proportion of C C aliphatic hydrocarbons is increased. In a modification of this example, the higher molecular weight fuel is continuously fed into a transducer containing chamber. The transducer is activiated and portions of the fuel are continuously removed therefrom. The removed fuel has a substantially increased proportion of lower molecular weight hydrocarbons therein. The longer the fuel is exposed to the activated transducer and also the higher the frequency of the sonic energy introduced into the fuel, the greater is the proportion of lower molecular weight material.
EXAMPLE 4 In this example, combustion product of fuels of an internal combustion engine such as gasoline engine, are passed through a transducer element containing chamber at the outlet of which is placed charcoal. The transducer is activated to emit sonic energy in the range of between 101500 kilocycles per second. The exhaust fumes are retained by the charcoal. Analysis of the fumes retained by the charcoal shows a substantial proportion of lower molecular weight products compared with the combusition products as directly exhausted from the engine prior to the passage through the sonic chamber. In a modification of this example, water is substituted for the charcoal. Results analogous to the charcoal system are obtained.
In modification of this example, a recycle line is included prior to the charcoal or water. The recycle line feeds a major portion of the fumes directly back into the engine for further combustion.
EXAMPLE In a process similar to the embodiment described for metal recovery from metal-containing ores, sonic probes are placed in cavities in subterranean strata containing either or both natural gas and residual crude oil which is trapped in the pores of the strata. The probes are activated and sonic energy in the range of between -1500 kilocycles per second is transmitted into the hydrocarbon containing strata. The sonic energy, in proportion to its frequency, intensity and duration causes fissures and cracks the strata formation, thereby freeing the hydrocarbon for more efficient secondary recovery by usual methods such as by pumping or pressurization recovery.
Above about 100 kilocycles per second the rate of fissuring falls off decreasing the efiiciency of the process.
It will be understood that it is intended to cover all changes and modifications of the examples of the invention herein chosen for the purpose of illustration which do not constitute departures from the spirit and scope of the invention.
What is claimed is:
1. The process of rupturing molecular bonds in a material comprising the steps of:
(1) contacting a material with a carrier agent for said material;
(2) subjecting said contacted material and agent to sonic energy having a frequency of at least 10 kilocycles per second causing molecular bonds in said material to rupture;
(3) removing a portion of said agent having therein at least a portion of the said ruptured material; and
(4) separating said ruptured material and agent from each other subsequent to said subjecting step.
2. The process of claim 1 wherein said process is continuously operated by continuously adding fresh agent for contacting said material, and continuously removing a portion of said agent having therein at least a portion of said material.
3. The process of claim 2 wherein said carrier agent includes a surfactant therein.
4. The process of claim 1 wherein:
(1) said material is oil shale comprising kerogen and mineral matter and said portion of said removed material is substantially free of said mineral matter;
(2) said agent comprises water; and
(3) said sonic energy is ultrasonic energy having a frequency of at least 16 kilocycles per second.
5. The process of claim 4 wherein said carrier agent includes a surfactant therein.
6. The process of claim 1 wherein said carrier agent includes a surfactant therein.
7. The process of claim 1 wherein:
(1) said material is petroleum crude oil;
(2) said agent comprises water; and
(3) said sonic energy is ultrasonic energy having a frequency of at least 16 kilocycles per second.
8. The process of claim 7 wherein said carrier agent includes a surfactant therein.
9. The process of c a m 1 wherein:
(1) said material is a higher molecular weight organic fuel;
(2) said agent comprises water; and
(3) said sonic energy is ultrasonic energy having a.
frequency of at least 16 kilocycles per second.
10. The process of claim 9 wherein said carrier agent includes a surfactant therein.
11. The process of claim 1 wherein:
(1) said material is the product of combustion of the fuel in a combustion engine;
(2) said agent is selected from the group consisting of a water solution and carbon; and
(3) said sonic energy is ultrasonic energy having a frequency of at least 16 kilocycles per second.
12. The process of claim 11 wherein said carrier agent includes a surfactant therein.
13. A process for recovering shale oil in situ from subterranean oil shale deposits comprising the steps of:
(1) contacting oil shale with a carrier agent for the hydrocarbon portion of said oil shale;
(2) subjecting said contacted oil shale and agent to sonic energy having a frequency of at least 10 kilocycles per second thereby causing molecular bonds in said material to rupture; and
(3) removing at least a portion of said agent having therein at least a portion of said ruptured shale oil.
14. The process of claim 13 wherein said carier agent includes water and a surfactant.
15. The process of reacting compounds by rupture of molecular bonds in said compounds comprising the steps of:
(1) contacting an alkane with a carboxylic acid in the presence of a carrier agent;
(2) subjecting said contacted alkane and acid to sonic energy having a frequency of at least 10 kilocycles per second causing molecular bonds in said compounds to rupture and react to form reaction products; and
(3) separating at least a portion of said reaction products from said compounds and agent.
16. The process of claim 15 wherein said alkane is butane and said acid is acetic and the reaction product is butyl acetate.
17. A process for recovering shale oil in situ from subterranean oil shale deposits comprising the steps of:
(1) fragmentizing subterranean oil shale deposits;
(2) subjecting oil shale to sonic energy having a frequency of at least 10 kilocycles per second thereby causing molecular bonds in the shale oil to rupture; and
(3) removing said ruptured shale oil from said shale.
18. The process of claim 17 wherein said fragmentization is caused by detonation of a nuclear device, and wherein said oil shale is removed from said shale after being contacted with a carrier agent.
19. A process for recovering metal from metal-containing ore comprising contacting said metal-containing ore with a carrier agent and then subjecting said metalcontaining ore to sonic energy having a frequency of at least 10 kilocycles per second causing molecular bonds between said metal-containing ore to rupture; and then separating said ruptured metal-containing ore and agent from each other.
20. The process of claim 19 wherein said carrier agent includes a surfactant.
21. A process for freeing trapped natural gas and residual crude oil from pores in subterranean strata comprising the steps of contacting crude oil or natural gas containing subterranean strata with a carrier agent for said oil or gas and subjecting said subterranean strata containing crude oil or natural gas to sonic energy having a frequency of at least 10 kilocycles per second causing molecular bonds between said strata material to rupture and recovering said freed natural gas or crude oil.
22. The process of freeing petroleum products from subterranean shale strata deposits comprising:
(1) flooding subterranean shale strata deposits with a carrier agent in the vicinity of the described electrical energy input into said strata;
(2) transmitting electrical energy into said strata at a resonance frequency for said strata; and
(3) recovering petroleum products freed from said strata.
23. The process of claim 22 wherein said carrier agent includes an aqueous solution and a surfactant.
References Cited UNITED STATES PATENTS relied on).
Branson et a1 20811 X Putman 16640 X Sherborne 166177 X Fleck 166177 X Brandon 166177 Bodine 166177 X Brandon 166-177 X Dixon 16636 OTHER REFERENCES Goldman: Ultrasonic Technology, Reinhold Publishing Co., New York (1962), (pp. 146-150 and 160-164 Anonymous: Harnessed Sound, The Oil and Gas 15 Journal, Dec. 22, 1948, p. 124 relied on.
Bodine 166-9 Morrell et al. 20811 X Graham et aL 166 9 X STEPHEN I. NOVOSAD, Primary Examinel Marx et al. 16611 Tek et a1 208-11 Logan 166-45 X -15; 166-249, 272; 204158; 29914 Bodine 208-11
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