EP2463478A1 - Wireless communication between tools - Google Patents
Wireless communication between tools Download PDFInfo
- Publication number
- EP2463478A1 EP2463478A1 EP10194466A EP10194466A EP2463478A1 EP 2463478 A1 EP2463478 A1 EP 2463478A1 EP 10194466 A EP10194466 A EP 10194466A EP 10194466 A EP10194466 A EP 10194466A EP 2463478 A1 EP2463478 A1 EP 2463478A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- acoustic
- downhole
- signals
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
Definitions
- the present invention relates to a downhole tool system for being submerged into a casing, comprising at least three tools. Furthermore, the invention relates to a communication method for communicating wirelessly between a first and a third tool separated by a second tool.
- well fluid is most often very inhomogeneous as it comprises mud, scales, both oil and water, and gas bubbles. Therefore, the communication sometimes fails.
- a downhole tool system for being submerged into a casing comprising at least three tools:
- the acoustic devices arranged at each end of the intermediate tool are able to send acoustic signals propagating along the housing of the intermediate and second tool.
- the housing is often made of a solid material, increasing its transmitting ability compared to the transmitting ability in the surrounding well fluid which may be inhomogeneous and thereby be a poor transmitting media compared to a metal housing.
- the three tools are most often connected by means of threaded connections providing a sufficiently firm connection for transmitting acoustic signals from the first or third tool to the second tool.
- the first and second acoustic devices may comprise means for converting data parameters into electric signals and transducers for receiving the electrical signal and generating acoustic signals propagating along the housing of the second tool.
- the transducers may abut the ends of the second tool.
- the transducers of the first and second acoustic devices may face the second tool, causing the acoustic signals to propagate axially along the housing of the second tool.
- the first and second communication devices may be antennas instead of acoustic devices, sending and receiving radio waves.
- the antennas may transmit signals having a wavelength of 1-2 cm.
- the third tool may be a logging tool.
- the first tool may comprise an electronic motor.
- first and/or second communication device(s) may comprise a memory.
- the first and/or second communication device(s) may comprise a processing unit for processing data before converting the data into acoustic signals.
- the transducer may be a magnetostrictive transducer.
- the acoustic devices may comprise piezoelectric microphones.
- the first tool may be connected with a wireline.
- the first or third tool may comprise a driving unit, such as a downhole tractor.
- the communication device may comprise a battery.
- the acoustic devices may comprise mechanical or electronic filters.
- the present invention furthermore relates to a communication method for communicating wirelessly between a first and a third tool separated by a second tool, comprising the steps of:
- the communication method may further comprise the step of converting data parameters into electric signals.
- Fig. 1 shows a downhole tool system 1 comprising three tools; a first 1, a second 2 and a third 3 tool, arranged as a tool string.
- the first tool 1 is connected to a wireline at its first end 11 to power the tool string.
- the first tool 1 is connected to a first end 21 of the second tool 2 by means of a threaded connection firmly connecting the first 1 and second 2 tools.
- the second tool 2 is connected to a first end 31 of the third tool 3, also by means of a threaded connection.
- Two operators may work together to perform a well operation in the sense that a tool of one operator is arranged between the tools of another operator.
- the first 1 and the third tool 3 come from a first operator and the second tool 2 comes from a second operator. Since the first 1 and third 3 tools are separated by the second tool 2, communication between the tools of the first operator cannot take place inside the tools in the conventional way since it is not possible to communicate through the second tool 2. This is due to the fact that the second operator uses a different communication system than the first operator and that it is not possible to pull wires through the intermediate tool without having to substantially reconstruct this tool.
- the first 1 and third 3 tools comprise communication devices 13, 33 in the form of acoustic devices.
- the acoustic device of the first tool 1 is arranged in a housing wall at the second end 12 of the first tool 1, abutting the first end 21 of the second tool 2, thereby being able to generate acoustic signals propagating axially along the housing 23 of the second tool 2.
- the acoustic device of the third tool 3 is arranged in a housing wall at the first end 31 of the third tool 3, abutting the second end 22 of the second tool 2, thereby also being able to generate acoustic signals propagating axially along the housing 23 of the second tool 2.
- Each acoustic device comprises a transducer 5 facing the end of the housing 23 of the second tool 2.
- the transducers 5 may be magnetostrictive transducers transmitting acoustic signals in the form of longitudinal sonic waves along the housing 23 of the second tool 2.
- the communication devices 13, 33 comprise antennas for sending and receiving radio waves having wavelengths of 1-2 cm.
- the antennas are arranged so that they project only partly from the outer faces of the first 1 and third tools 3 and extend parallel to the longitudinal extension of the tools.
- the radio waves propagate in the well fluid along the tool string without being substantially destroyed when hitting the wall of the tools 1, 2, 3 or the wall of the production casing 10.
- the antennas are arranged in the housings of the first 1 and third 3 tools and are isolated from the other parts of the tools to improve the quality of the communication between the first 1 and third 3 tools.
- the antennas may also be projecting parts of the tools and be projected as required and maintained inside the tools when the tool string is submerged into the casing 10.
- fluid or well fluid any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc.
- gas is meant any kind of gas composition present in a well, completion, or open hole
- oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc.
- Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
- a casing any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
- a downhole tractor can be used to push the tools all the way into position in the well.
- a downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
Abstract
The present invention relates to a downhole tool system for being submerged into a casing, comprising at least three tools. Furthermore, the invention relates to a communication method for communicating wirelessly between a first and a third tool separated by a second tool.
Description
- The present invention relates to a downhole tool system for being submerged into a casing, comprising at least three tools. Furthermore, the invention relates to a communication method for communicating wirelessly between a first and a third tool separated by a second tool.
- Communication between surface and a tool in a well via acoustic signals in the well fluid is known. However, well fluid is most often very inhomogeneous as it comprises mud, scales, both oil and water, and gas bubbles. Therefore, the communication sometimes fails.
- Sometimes, two operators work together to perform a well operation in the sense that a tool of one operator is arranged between the tools of another operator. However, when this is the case, communication between the tools of the other operator is hindered as these tools are separated by the tool of the one operator, through which communication is not possible. This is due to the fact that the one operator uses a different communication system than the other operator and that it is not possible to pull wires through the intermediate tool.
- Since prior art acoustic communication through well fluid does not always function successfully, there is a need for an alternative communication form.
- It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art. More specifically, it is an object to provide an improved tool string enabling successful communication between two tools separated by an intermediate tool.
- The above objects, together with numerous other objects, advantages, and features, which will become evident from the below description, are accomplished by a solution in accordance with the present invention by a downhole tool system for being submerged into a casing, comprising at least three tools:
- a first tool having a first and a second end and comprising a first communication device arranged at the second end,
- a second tool having a first end, which is connected with the second end of the first tool, and a second end, the second tool comprising a housing, and
- a third tool comprising a second communication device arranged at a first end, the first end of the third tool being connected with the second end of the second tool,
- During a well operation, two operators may be forced to work together in the sense that one operator provides one tool and the other operator provides two tools, and the three tools are to be connected into one tool string where the tool of the one operator is arranged between the two tools of the second operator. In such a situation, the second operator must be able to communicate from one tool to the other through the intermediate tool. However, operators often use different communication systems, and sometimes, the second operator is not able to get communication cables into and through the intermediate tool. Therefore, there is a need for a tool system facilitating communication from one tool to another through an intermediate tool.
- The acoustic devices arranged at each end of the intermediate tool are able to send acoustic signals propagating along the housing of the intermediate and second tool. The housing is often made of a solid material, increasing its transmitting ability compared to the transmitting ability in the surrounding well fluid which may be inhomogeneous and thereby be a poor transmitting media compared to a metal housing.
- The three tools are most often connected by means of threaded connections providing a sufficiently firm connection for transmitting acoustic signals from the first or third tool to the second tool.
- In an embodiment of the invention, the first and second acoustic devices may comprise means for converting data parameters into electric signals and transducers for receiving the electrical signal and generating acoustic signals propagating along the housing of the second tool.
- Furthermore, the transducers may abut the ends of the second tool.
- Moreover, the transducers of the first and second acoustic devices may face the second tool, causing the acoustic signals to propagate axially along the housing of the second tool.
- In another embodiment, the first and second communication devices may be antennas instead of acoustic devices, sending and receiving radio waves.
- Moreover, the antennas may transmit signals having a wavelength of 1-2 cm.
- The third tool may be a logging tool.
- Furthermore, the first tool may comprise an electronic motor.
- In addition, the first and/or second communication device(s) may comprise a memory.
- Also, the first and/or second communication device(s) may comprise a processing unit for processing data before converting the data into acoustic signals.
- Moreover, the transducer may be a magnetostrictive transducer.
- Additionally, the acoustic devices may comprise piezoelectric microphones.
- Furthermore, the first tool may be connected with a wireline.
- Moreover, the first or third tool may comprise a driving unit, such as a downhole tractor.
- In addition, the communication device may comprise a battery.
- Also, the acoustic devices may comprise mechanical or electronic filters.
- The present invention furthermore relates to a communication method for communicating wirelessly between a first and a third tool separated by a second tool, comprising the steps of:
- connecting the first tool with the second tool, the first tool comprising a first acoustic device and the second tool comprising a tool housing,
- connecting the third tool with the second tool, the third tool comprising a second acoustic device,
- sending acoustic signals from the first acoustic device to the second acoustic device, the signals propagating along the housing of the tool.
- The communication method may further comprise the step of converting data parameters into electric signals.
- The invention and its many advantages will be described in more detail below with reference to the accompanying schematic drawings, which for the purpose of illustration show some non-limiting embodiments and in which
-
Fig. 1 shows a partial cross-sectional view of a downhole tool system, and -
Fig. 2 shows another embodiment of the downhole tool system. - All the figures are highly schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the invention, other parts being omitted or merely suggested.
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Fig. 1 shows adownhole tool system 1 comprising three tools; a first 1, a second 2 and a third 3 tool, arranged as a tool string. Thefirst tool 1 is connected to a wireline at itsfirst end 11 to power the tool string. In itssecond end 12, thefirst tool 1 is connected to afirst end 21 of thesecond tool 2 by means of a threaded connection firmly connecting the first 1 and second 2 tools. In itssecond end 22, thesecond tool 2 is connected to afirst end 31 of thethird tool 3, also by means of a threaded connection. - Two operators may work together to perform a well operation in the sense that a tool of one operator is arranged between the tools of another operator. Thus, the first 1 and the
third tool 3 come from a first operator and thesecond tool 2 comes from a second operator. Since the first 1 and third 3 tools are separated by thesecond tool 2, communication between the tools of the first operator cannot take place inside the tools in the conventional way since it is not possible to communicate through thesecond tool 2. This is due to the fact that the second operator uses a different communication system than the first operator and that it is not possible to pull wires through the intermediate tool without having to substantially reconstruct this tool. - Therefore, the first 1 and third 3 tools comprise
communication devices first tool 1 is arranged in a housing wall at thesecond end 12 of thefirst tool 1, abutting thefirst end 21 of thesecond tool 2, thereby being able to generate acoustic signals propagating axially along the housing 23 of thesecond tool 2. The acoustic device of thethird tool 3 is arranged in a housing wall at thefirst end 31 of thethird tool 3, abutting thesecond end 22 of thesecond tool 2, thereby also being able to generate acoustic signals propagating axially along the housing 23 of thesecond tool 2. - Each acoustic device comprises a
transducer 5 facing the end of the housing 23 of thesecond tool 2. Thetransducers 5 may be magnetostrictive transducers transmitting acoustic signals in the form of longitudinal sonic waves along the housing 23 of thesecond tool 2. - In
Fig. 2 , thecommunication devices third tools 3 and extend parallel to the longitudinal extension of the tools. By having antennas transmitting signals with wavelengths of 1-2 cm, the radio waves propagate in the well fluid along the tool string without being substantially destroyed when hitting the wall of thetools production casing 10. - The antennas are arranged in the housings of the first 1 and third 3 tools and are isolated from the other parts of the tools to improve the quality of the communication between the first 1 and third 3 tools.
- The antennas may also be projecting parts of the tools and be projected as required and maintained inside the tools when the tool string is submerged into the
casing 10. - By fluid or well fluid is meant any kind of fluid that may be present in oil or gas wells downhole, such as natural gas, oil, oil mud, crude oil, water, etc. By gas is meant any kind of gas composition present in a well, completion, or open hole, and by oil is meant any kind of oil composition, such as crude oil, an oil-containing fluid, etc. Gas, oil, and water fluids may thus all comprise other elements or substances than gas, oil, and/or water, respectively.
- By a casing is meant any kind of pipe, tubing, tubular, liner, string etc. used downhole in relation to oil or natural gas production.
- In the event that the tools are not submergible all the way into the casing, a downhole tractor can be used to push the tools all the way into position in the well. A downhole tractor is any kind of driving tool capable of pushing or pulling tools in a well downhole, such as a Well Tractor®.
- Although the invention has been described in the above in connection with preferred embodiments of the invention, it will be evident for a person skilled in the art that several modifications are conceivable without departing from the invention as defined by the following claims.
wherein the second tool is arranged between the first and the third tool, and the first acoustic device arranged at the first end of the second tool sends and receives acoustic signals to and from the second acoustic device which is arranged at the first end of the third tool.
Claims (15)
- A downhole tool system (100) for being submerged into a casing (10), comprising at least three tools:- a first tool (1) having a first (11) and a second end (12) and comprising a first communication device (13) arranged at the second end,- a second tool (2) having a first end (21), which is connected with the second end of the first tool, and a second end (22), the second tool comprising a housing (23), and- a third tool (3) comprising a second communication device (33) arranged at a first end (31), the first end of the third tool being connected with the second end of the second tool,the first and second communication devices being a first and a second acoustic device, respectively,
wherein the second tool is arranged between the first and the third tool, and the first acoustic device arranged at the first end of the second tool sends and receives acoustic signals to and from the second acoustic device which is arranged at the first end of the third tool. - A downhole tool system according to claim 1, wherein the first and second acoustic devices comprise means (4) for converting data parameters into electric signals and transducers (5) for receiving the electrical signals and generating acoustic signals propagating along the housing of the second tool.
- A downhole tool system according to claim 2, wherein the transducers abut the ends of the second tool.
- A downhole tool system according to any of the preceding claims, wherein the transducers of the first and second acoustic devices face the second tool, causing the acoustic signals to propagate axially along the housing of the second tool.
- A downhole tool system according to any of the preceding claims, wherein the first and second communication devices are antennas instead of acoustic devices, sending and receiving radio waves.
- A downhole tool system according to claim 5, wherein the antennas transmit signals having a wavelength of 1-2 cm.
- A downhole tool system according to any of the preceding claims, wherein the third tool is a logging tool.
- A downhole tool system according to any of the preceding claims, wherein the first tool comprises an electronic motor (14).
- A downhole tool system according to any of the preceding claims, wherein the first and/or second communication device(s) comprise(s) a memory (6).
- A downhole tool system according to any of the preceding claims, wherein the first and/or second communication device(s) comprise(s) a processing unit (7) for processing data before converting the data into acoustic signals.
- A downhole tool system according to any of the preceding claims, wherein the transducer is a magnetostrictive transducer.
- A downhole tool system according to any of the preceding claims, wherein the communication device comprises a battery (8).
- A downhole tool system according to any of the preceding claims, wherein the acoustic devices comprise mechanical or electronic filters (9).
- A communication method for communicating wirelessly between a first and a third tool separated by a second tool, comprising the steps of:- connecting the first tool with the second tool, the first tool comprising a first acoustic device and the second tool comprising a tool housing,- connecting the third tool with the second tool, the third tool comprising a second acoustic device,- sending acoustic signals from the first acoustic device to the second acoustic device, the signals propagating along the housing of the tool.
- A communication method according to claim 14, further comprising the step of converting data parameters into electric signals.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10194466A EP2463478A1 (en) | 2010-12-10 | 2010-12-10 | Wireless communication between tools |
MX2013006334A MX2013006334A (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools. |
US13/991,492 US20130257629A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
PCT/EP2011/072300 WO2012076682A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
RU2013130350/03A RU2013130350A (en) | 2010-12-10 | 2011-12-09 | WIRELESS COMMUNICATION BETWEEN TOOLS |
BR112013013797A BR112013013797A2 (en) | 2010-12-10 | 2011-12-09 | wireless communication between tools |
CN2011800587091A CN103237956A (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
AU2011340491A AU2011340491A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
CA2820830A CA2820830A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
EP11804518.6A EP2649273A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10194466A EP2463478A1 (en) | 2010-12-10 | 2010-12-10 | Wireless communication between tools |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2463478A1 true EP2463478A1 (en) | 2012-06-13 |
Family
ID=43919838
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10194466A Withdrawn EP2463478A1 (en) | 2010-12-10 | 2010-12-10 | Wireless communication between tools |
EP11804518.6A Withdrawn EP2649273A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11804518.6A Withdrawn EP2649273A1 (en) | 2010-12-10 | 2011-12-09 | Wireless communication between tools |
Country Status (9)
Country | Link |
---|---|
US (1) | US20130257629A1 (en) |
EP (2) | EP2463478A1 (en) |
CN (1) | CN103237956A (en) |
AU (1) | AU2011340491A1 (en) |
BR (1) | BR112013013797A2 (en) |
CA (1) | CA2820830A1 (en) |
MX (1) | MX2013006334A (en) |
RU (1) | RU2013130350A (en) |
WO (1) | WO2012076682A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2843188A1 (en) * | 2013-09-03 | 2015-03-04 | Welltec A/S | A downhole communication module |
WO2017135828A1 (en) * | 2016-02-03 | 2017-08-10 | Industrial Controls As | Apparatus and method for transferring information acoustically from a borehole |
US10323508B2 (en) * | 2013-02-27 | 2019-06-18 | Halliburton Energy Services, Inc. | Apparatus and methods for monitoring the retrieval of a well tool |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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PL2983313T3 (en) | 2014-08-03 | 2023-10-16 | Schlumberger Technology B.V. | Acoustic communications network with frequency diversification |
GB2552597B (en) * | 2015-03-11 | 2020-11-18 | Halliburton Energy Services Inc | Antenna for downhole communication using surface waves |
US10145238B2 (en) | 2015-04-22 | 2018-12-04 | Halliburton Energy Services, Inc. | Automatic adjustment of magnetostrictive transducer preload for acoustic telemetry in a wellbore |
US10408004B2 (en) * | 2015-06-02 | 2019-09-10 | Tubel Energy LLC | System for acquisition of wellbore parameters and short distance data transfer |
US11293281B2 (en) * | 2016-12-19 | 2022-04-05 | Schlumberger Technology Corporation | Combined wireline and wireless apparatus and related methods |
CN108643893B (en) * | 2018-05-09 | 2020-10-09 | 中国科学院地质与地球物理研究所 | While-drilling azimuth acoustic wave imaging logging device |
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2010
- 2010-12-10 EP EP10194466A patent/EP2463478A1/en not_active Withdrawn
-
2011
- 2011-12-09 AU AU2011340491A patent/AU2011340491A1/en not_active Abandoned
- 2011-12-09 US US13/991,492 patent/US20130257629A1/en not_active Abandoned
- 2011-12-09 MX MX2013006334A patent/MX2013006334A/en active IP Right Grant
- 2011-12-09 CA CA2820830A patent/CA2820830A1/en not_active Abandoned
- 2011-12-09 WO PCT/EP2011/072300 patent/WO2012076682A1/en active Application Filing
- 2011-12-09 RU RU2013130350/03A patent/RU2013130350A/en not_active Application Discontinuation
- 2011-12-09 CN CN2011800587091A patent/CN103237956A/en active Pending
- 2011-12-09 BR BR112013013797A patent/BR112013013797A2/en not_active IP Right Cessation
- 2011-12-09 EP EP11804518.6A patent/EP2649273A1/en not_active Withdrawn
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10323508B2 (en) * | 2013-02-27 | 2019-06-18 | Halliburton Energy Services, Inc. | Apparatus and methods for monitoring the retrieval of a well tool |
EP2843188A1 (en) * | 2013-09-03 | 2015-03-04 | Welltec A/S | A downhole communication module |
WO2015032796A1 (en) * | 2013-09-03 | 2015-03-12 | Welltec A/S | A downhole tool |
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RU2667364C2 (en) * | 2013-09-03 | 2018-09-19 | Веллтек А/С | Downhole tool |
WO2017135828A1 (en) * | 2016-02-03 | 2017-08-10 | Industrial Controls As | Apparatus and method for transferring information acoustically from a borehole |
GB2562943A (en) * | 2016-02-03 | 2018-11-28 | Ind Controls As | Apparatus and method for transferring information acoustically from a borehole |
US10697292B2 (en) | 2016-02-03 | 2020-06-30 | Industrial Controls As | Apparatus and method for transferring information acoustically from a borehole |
GB2562943B (en) * | 2016-02-03 | 2021-03-17 | Ind Controls As | Apparatus and method for transferring information acoustically from a borehole |
Also Published As
Publication number | Publication date |
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MX2013006334A (en) | 2013-06-28 |
CN103237956A (en) | 2013-08-07 |
WO2012076682A1 (en) | 2012-06-14 |
AU2011340491A1 (en) | 2013-05-02 |
EP2649273A1 (en) | 2013-10-16 |
BR112013013797A2 (en) | 2016-09-13 |
RU2013130350A (en) | 2015-01-20 |
US20130257629A1 (en) | 2013-10-03 |
CA2820830A1 (en) | 2012-06-14 |
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