WO1998038470A1 - Well boring with blasting agents - Google Patents
Well boring with blasting agents Download PDFInfo
- Publication number
- WO1998038470A1 WO1998038470A1 PCT/EP1998/001081 EP9801081W WO9838470A1 WO 1998038470 A1 WO1998038470 A1 WO 1998038470A1 EP 9801081 W EP9801081 W EP 9801081W WO 9838470 A1 WO9838470 A1 WO 9838470A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- perforation
- ignition
- switch
- ignition line
- signal combination
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/045—Arrangements for electric ignition
- F42D1/05—Electric circuits for blasting
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/1185—Ignition systems
Definitions
- the invention relates to a device for perforating walls of boreholes, in particular boreholes, which are used for oil or gas production.
- Drill holes for oil production usually run through several vertically spaced oil-bearing layers. In order to work economically, all areas of the borehole that lie in the area of these oil-bearing layers are perforated. Since lowering the explosive charges to the desired perforation depths is a lengthy process, it is customary to use a plurality of ignition stages attached to one or more ignition lines, each of which has a detonator with the associated explosive charges.
- the known systems work with mechanical switches for separating the individual ignition stages. The problem with these systems is that short circuits or undefined conditions can occur, which means that the blasting must be stopped and the ignition stage must be pulled out of the borehole again.
- the invention has for its object to provide an explosive perforation device with improved activation and electrical isolation of the individual ignition stages.
- the explosive perforation device has a plurality of perforation stages arranged one behind the other, which are electrically connected in series to an ignition line.
- Each perforation level contains an addressable switch, which can be selectively activated by a signal combination on the ignition cable. In the idle state, the switch switches the ignition line through to the next perforation level. Only a two-pole ignition cable is used, in which the switches are arranged.
- An ignition control unit which activates the individual perforation charges of a perforation stage, is separated from the ignition line in the idle state of the switch. In the working position of the switch, the ignition control device is connected to the ignition line, while the ignition line is interrupted to the next lower perforation level.
- the explosive perforation device has the advantage that in the rest position of the switch, the downstream detonator electronics of the perforation stages are galvanically separated from the ignition line. Only when a perforation stage switch is activated by programming is the electronics of this addressed perforation stage connected to the ignition line, so that the ignition control device of the perforation stage is activated. After activating the ignition control device, it must be programmed with special digital signals in order to be able to address and ignite the perforation charges of this perforation level. If the ignition control device receives signals that do not meet the specification, the ignition control device must be reset by interrupting the voltage supply for 20 seconds. This double addressing makes a misfire very unlikely.
- the ignition control device can be programmed such that the perforation charges of the perforation level in question only detonate after an adjustable delay time. This makes it possible to program the lowest perforation level and to activate the switch of the next higher perforation level within the delay time, so that the lowest perforation level is disconnected from the ignition line in order to prevent the next higher perforation level or the igniter from being detonated The perforation charges on the ignition cable are damaged.
- each switch contains an individual address. When this address is received, this switch changes to the working position.
- the address of the switch advantageously consists of eight digits. This address is transmitted serially on the ignition cable and stored in a shift register of the switch. This addressing of the switch increases the safety of the blast perforation direction, since each switch can be addressed selectively and any interference pulses on the ignition line do not lead to activation of the switch.
- the object is achieved with the features of claim 5.
- the perforation stages are electrically connected in series to the ignition line, and each perforation stage has an electronic switch with three switch positions, the switches being open in the idle state and brought into the position corresponding to the respective signal combination by one of two possible signal combinations on the ignition line become.
- this alternative embodiment is identical to the embodiment according to claim 1.
- the ignition control device can advantageously only be activated by a specific signal combination on the ignition line.
- the signal combination has eight or more digits on the ignition line, this signal combination being compared with a signal combination stored in a shift register of the electronic switch.
- the signal combination on the ignition line preferably consists of a specific number of pulses within a defined time window, the signal combination being compared with that stored in the switch electronics.
- Fig. 2 shows the basic structure of an explosive perforation device
- Fig. 3 shows the chronological sequence of a hole perforation.
- a blast perforation device 10 hangs on an ignition line in the borehole 1.
- the blast perforation device 10 has an upper perforation step 12 and a lower perforation step 13.
- the lower perforation step 13 has already detonated and has perforated the borehole wall 2, so that the oil from the oil-bearing layer 4 can enter the borehole 1 and can be conveyed from there.
- FIG. 2 shows the blasting perforation device 10 with the two perforation stages 12 and 13.
- Each perforation stage has an electronic switch 14 arranged in the ignition line 11, which in its rest position connects the ignition line 11 to the next lower perforation stage. In the working position, the switch 14 disconnects the ignition line 11 and connects the upper end of the ignition line 11 to an ignition control device 15.
- Radially connected to these are perforation charges 16 which are distributed circumferentially and one above the other.
- the perforation charges are hollow charges 16 which act radially outwards and, when ignited, blow up round holes in the steel jacket of the tube 2, through which the oil can then penetrate into the tube 2.
- the ignition control device 15 can be programmed so that a delay time is set. If the ignition control device 15 then receives an ignition signal, the shaped charges 16 only detonate after this delay time has elapsed.
- the switch 14 has control electronics 17 and a switching element 18 which is actuated as a function of the control electronics 17. Once the switching element 18 has been actuated, it remains in the working position, even if the voltage supply is removed from the ignition line 11, e.g. B. if an ignition control device 15 must be reset after receiving a faulty signal.
- Ignition line 11 only with an above-ground igniter, not shown here. is bound, but not with one of the ignition control devices 15.
- the switch 14 of the lowest perforation level 13 becomes a specific address signal ASi addressed (time interval T).
- the address signal AS is serially transmitted on the ignition line 11, which consists of two wires, as an 8-bit signal from the ignition device to the switches 14.
- the electronics 17 of the switch 14 detects a bit change in the unipolar address signal AS when the signal voltage exceeds or falls below a value which corresponds to half the normal signal amplitude.
- the individual bits are read into a shift register one after the other, the content of which is advanced with each bit change. After 8 bits have been read in, the content of the shift register is read out and compared with a permanently stored address assigned to the respective switch 14. If the two addresses are identical, the switching element 18 of the switch 14 is activated in a time interval T 2 , so that the ignition control device 15 of the lowest perforation level 13 is connected to the ignition line 11 and thus to the ignition device.
- the ignition control device 15 is now programmed with a bipolar programming signal PS.
- the programming signal PS consists of a first part, with which the ignition control device 15 is unlocked, and a second part, with which the delay time T v is programmed.
- the programmed, freely selectable delay time T v is activated.
- the switch 14 of the next higher perforation stage 12 is addressed (T), so that in an interval T 5 the ignition line 11 is opened by flipping this switch and is connected to the ignition control device of the perforation stage 12.
- the bottom perforation stage 13 is thus completely separated from the ignition line 11.
- the delay time T v is dimensioned such that within the delay time T v the switch 14 of the next higher perforation stage 12 can be activated with an address signal AS 2 , which differs from the address signal ASi, and a certain safety time (e.g. half of the Time interval T 6 ) is available.
- the ignition control device 15 ignites all shaped charges 16 of the lowest perforation level 13.
- the perforation level 12 which is now the lowest perforation level, becomes up to the height proceed to the next oil-bearing layer 4.
- the sequence now repeats from time t 2 .
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98913594A EP0963539A1 (en) | 1997-02-28 | 1998-02-26 | Well boring with blasting agents |
AU68239/98A AU6823998A (en) | 1997-02-28 | 1998-02-26 | Well boring with blasting agents |
CA002282324A CA2282324A1 (en) | 1997-02-28 | 1998-02-26 | Well boring with blasting agents |
NO994166A NO994166L (en) | 1997-02-28 | 1999-08-27 | Explosive perforation device for wells |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19708073.1 | 1997-02-28 | ||
DE19708073 | 1997-02-28 | ||
DE19807386.0 | 1998-02-21 | ||
DE19807386A DE19807386A1 (en) | 1997-02-28 | 1998-02-21 | Blasting perforation device for boreholes |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998038470A1 true WO1998038470A1 (en) | 1998-09-03 |
Family
ID=26034372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/001081 WO1998038470A1 (en) | 1997-02-28 | 1998-02-26 | Well boring with blasting agents |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0963539A1 (en) |
AU (1) | AU6823998A (en) |
CA (1) | CA2282324A1 (en) |
DE (1) | DE19807386A1 (en) |
NO (1) | NO994166L (en) |
WO (1) | WO1998038470A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6148263A (en) * | 1998-10-27 | 2000-11-14 | Schlumberger Technology Corporation | Activation of well tools |
US6283227B1 (en) | 1998-10-27 | 2001-09-04 | Schlumberger Technology Corporation | Downhole activation system that assigns and retrieves identifiers |
US6385031B1 (en) | 1998-09-24 | 2002-05-07 | Schlumberger Technology Corporation | Switches for use in tools |
US6752083B1 (en) | 1998-09-24 | 2004-06-22 | Schlumberger Technology Corporation | Detonators for use with explosive devices |
US6938689B2 (en) | 1998-10-27 | 2005-09-06 | Schumberger Technology Corp. | Communicating with a tool |
US7347278B2 (en) | 1998-10-27 | 2008-03-25 | Schlumberger Technology Corporation | Secure activation of a downhole device |
US9464508B2 (en) | 1998-10-27 | 2016-10-11 | Schlumberger Technology Corporation | Interactive and/or secure activation of a tool |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2341212A1 (en) * | 2009-12-29 | 2011-07-06 | Welltec A/S | Downhole perforation tool |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2655619A (en) * | 1948-10-25 | 1953-10-13 | Cherrietta Dover | Selective charge-firing equipment |
US4208966A (en) * | 1978-02-21 | 1980-06-24 | Schlumberger Technology Corporation | Methods and apparatus for selectively operating multi-charge well bore guns |
FR2530333A1 (en) * | 1982-07-16 | 1984-01-20 | Commissariat Energie Atomique | Installation for the transport and selective remote firing of several blasting charges carried by a carrying cable. |
US4496010A (en) * | 1982-07-02 | 1985-01-29 | Schlumberger Technology Corporation | Single-wire selective performation system |
US4527636A (en) * | 1982-07-02 | 1985-07-09 | Schlumberger Technology Corporation | Single-wire selective perforation system having firing safeguards |
EP0386860A2 (en) * | 1986-09-25 | 1990-09-12 | Nippon Oil And Fats Company, Limited | Detonating primer having delay circuit and system for electrically blasting detonating primers |
US5295438A (en) * | 1991-12-03 | 1994-03-22 | Plessey Tellumat South Africa Limited | Single initiate command system and method for a multi-shot blast |
-
1998
- 1998-02-21 DE DE19807386A patent/DE19807386A1/en not_active Withdrawn
- 1998-02-26 EP EP98913594A patent/EP0963539A1/en not_active Withdrawn
- 1998-02-26 AU AU68239/98A patent/AU6823998A/en not_active Abandoned
- 1998-02-26 CA CA002282324A patent/CA2282324A1/en not_active Abandoned
- 1998-02-26 WO PCT/EP1998/001081 patent/WO1998038470A1/en not_active Application Discontinuation
-
1999
- 1999-08-27 NO NO994166A patent/NO994166L/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2655619A (en) * | 1948-10-25 | 1953-10-13 | Cherrietta Dover | Selective charge-firing equipment |
US4208966A (en) * | 1978-02-21 | 1980-06-24 | Schlumberger Technology Corporation | Methods and apparatus for selectively operating multi-charge well bore guns |
US4496010A (en) * | 1982-07-02 | 1985-01-29 | Schlumberger Technology Corporation | Single-wire selective performation system |
US4527636A (en) * | 1982-07-02 | 1985-07-09 | Schlumberger Technology Corporation | Single-wire selective perforation system having firing safeguards |
FR2530333A1 (en) * | 1982-07-16 | 1984-01-20 | Commissariat Energie Atomique | Installation for the transport and selective remote firing of several blasting charges carried by a carrying cable. |
EP0386860A2 (en) * | 1986-09-25 | 1990-09-12 | Nippon Oil And Fats Company, Limited | Detonating primer having delay circuit and system for electrically blasting detonating primers |
US5295438A (en) * | 1991-12-03 | 1994-03-22 | Plessey Tellumat South Africa Limited | Single initiate command system and method for a multi-shot blast |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6385031B1 (en) | 1998-09-24 | 2002-05-07 | Schlumberger Technology Corporation | Switches for use in tools |
US6386108B1 (en) | 1998-09-24 | 2002-05-14 | Schlumberger Technology Corp | Initiation of explosive devices |
US6752083B1 (en) | 1998-09-24 | 2004-06-22 | Schlumberger Technology Corporation | Detonators for use with explosive devices |
US6148263A (en) * | 1998-10-27 | 2000-11-14 | Schlumberger Technology Corporation | Activation of well tools |
US6283227B1 (en) | 1998-10-27 | 2001-09-04 | Schlumberger Technology Corporation | Downhole activation system that assigns and retrieves identifiers |
US6604584B2 (en) | 1998-10-27 | 2003-08-12 | Schlumberger Technology Corporation | Downhole activation system |
US6938689B2 (en) | 1998-10-27 | 2005-09-06 | Schumberger Technology Corp. | Communicating with a tool |
US7347278B2 (en) | 1998-10-27 | 2008-03-25 | Schlumberger Technology Corporation | Secure activation of a downhole device |
US9464508B2 (en) | 1998-10-27 | 2016-10-11 | Schlumberger Technology Corporation | Interactive and/or secure activation of a tool |
Also Published As
Publication number | Publication date |
---|---|
EP0963539A1 (en) | 1999-12-15 |
NO994166L (en) | 1999-10-13 |
AU6823998A (en) | 1998-09-18 |
CA2282324A1 (en) | 1998-09-03 |
NO994166D0 (en) | 1999-08-27 |
DE19807386A1 (en) | 1998-09-03 |
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