CN102518419A - High-efficiency fracturing combined device for multi-stage horizontal well - Google Patents

High-efficiency fracturing combined device for multi-stage horizontal well Download PDF

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Publication number
CN102518419A
CN102518419A CN2012100061345A CN201210006134A CN102518419A CN 102518419 A CN102518419 A CN 102518419A CN 2012100061345 A CN2012100061345 A CN 2012100061345A CN 201210006134 A CN201210006134 A CN 201210006134A CN 102518419 A CN102518419 A CN 102518419A
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China
Prior art keywords
sliding sleeve
efficient
pressure break
open hole
fracturing
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CN2012100061345A
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Chinese (zh)
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CN102518419B (en
Inventor
祝效华
张向宁
刘清友
刘少胡
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西南石油大学
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Priority to CN201210006134.5A priority Critical patent/CN102518419B/en
Publication of CN102518419A publication Critical patent/CN102518419A/en
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Abstract

The invention relates to a special underground tool for conventional oil gas, shale gas and coal bed gas, in particular to a high-efficiency fracturing combined device for a multi-stage horizontal well. The high-efficiency fracturing combined device comprises an open hole packer, a high-efficiency fracturing sliding bush, a small open hole packer, a ball fracturing sliding bush and the like; the first section is provided with a conventional fracturing device; and the second section is provided with the high-efficiency fracturing combined device which has the same structure as high-efficiency fracturing combined devices from the third section to the sixteenth section. An upper joint of the high-efficiency fracturing sliding bush is in threaded connection with a front connecting sliding bush; the lower end of the front connecting sliding bush is connected with the upper end of a middle connecting sliding bush; the lower end of the middle connecting sliding bush is connected with a back connecting sliding bush; the lower end of the back connecting sliding bush is screwed with a lower joint through threads; an upper step of a front baffle is matched with a lower step of the front connecting sliding bush; the lower end of the front baffle is contacted with the lower end of a back baffle; and the lower end of the back baffle is contacted with the upper end of a C-shaped ball seat. The high-efficiency fracturing combined device has high sealing property and high fracturing well completion efficiency, can realize multi-stage fracturing, and improves the technical level and economic benefit of a fracturing technology.

Description

A kind of efficient pressing crack combined device that is used for multistage section horizontal well
Technical field
The present invention relates to be used for the special downhole tool of conventional gas and oil, shale gas, coal bed gas, is a kind of efficient pressing crack combined device that is used for multistage section horizontal well.
Background technology
Along with deepening continuously of domestic and international oil, natural gas resource exploration and development; Beginning is prone to exploitation oil gas by conventional shallow well; Emphasis with exploration and development turns to the difficulty that all kinds of distributions are wide, potentiality are big exploitation petroleum resourceses such as shale oil, shale gas, fine and close oil gas gradually, adopts horizontal well to add multistage section fracturing technique and will be novel energies such as high efficiency, low cost exploitation shale oil gas, fine and close oil gas, coal bed gas, improve one of major technique of recovery ratio.
At present; The fractured horizontal well of using both at home and abroad is mainly traditional following bridging plug gun perforation process, and adopts pitching single hop fracturing technique step by step, can only realize the to a certain degree pressure break of specific interval; Reservoir structure and pitching quantity all there is certain restriction; And not enough to the specific aim of reservoir reconstruction and validity, particularly abundant inadequately to the contact area and the post-fracturing seepage area of the open hole well reservoir of long horizontal segment, its effect of increasing production and reservoir potential can not effectively be brought into play.Therefore, press at present a kind of be applicable to conventional gas and oil, coal bed gas, shale gas efficient pressing crack combined device, can realize multistage section horizontal well carried out pressure break rapidly and efficiently; Solve the problem that a long-standing ball can only pressure break one deck; Shorten the pressure break time thereby reach; The purpose of economizing on the use of funds; As far as the bad ground conventional gas and oil of carrying out on a large scale at present both at home and abroad, the exploitation of unconventional oil gas, a kind ofly be used for the efficient frac system of multistage section horizontal well and the appearance of device will be accelerated its development rate.
Summary of the invention
The objective of the invention is :For solving the deficiency of prior art; Accelerate the development of multistage section fractured horizontal well technology of conventional gas and oil; And promoting the exploitation of coal bed gas, shale gas, the spy provides that a kind of crush speed is fast, the pressure break time is short, and can carry out a kind of efficient pressing crack combined device that is used for multistage section horizontal well of multistage fracturing to multistage section horizontal well.
For achieving the above object; The technical scheme that head it off of the present invention is taked is: a kind of efficient pressing crack combined device that is used for multistage section horizontal well; Form by open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, the stifled pressure break sliding sleeve of ball; It is characterized in that: open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, the stifled pressure break sliding sleeve of ball, open hole packer connect successively; Formed second section efficient pressing crack combined device; Second section efficient pressing crack combined device upper end is connected with identical the 3rd section of structure to the 16 section efficient pressing crack combined device, and the lower end is connected with first section conventional fracturing device.
A kind of top connection of efficient pressure break sliding sleeve of the efficient pressing crack combined device that is used for multistage section horizontal well with preceding be connected sliding sleeve be threaded, preceding connection sliding sleeve lower end connects the sliding sleeve upper end in connecting, middle connection sliding sleeve lower end is equipped with that the back connects sliding sleeve, the back connects the sliding sleeve lower end and is rotary with lower contact through screw thread; Topping bar and preceding be connected getting out of a predicament or an embarrassing situation of sliding sleeve and match on the front apron; The front apron lower end contacts with the backboard upper end; The backboard lower end contacts with the upper end of C type ball seat; The middle sliding sleeve afterbody that connects has a shear pin hole to pin with shear pin plate fixed shear; Top connection is equipped with sealing ring with preceding being connected between the sliding sleeve, front apron is equipped with two sealing rings and a resistance block with preceding being connected between the sliding sleeve.
A kind of front apron lower end that is used for the efficient pressing crack combined device of multistage section horizontal well has four front apron groovings, and is connected with backboard, and in order to opening jet, the upper end external diameter is greater than the lower end external diameter, and has the twice circumferential groove.
There are five ball seat groovings in a kind of C type ball seat outside that is used for the efficient pressing crack combined device of multistage section horizontal well, and the middle part has circular hole, and radially has radial slot along circular hole.After increasing pump pressure, compound pitching can be passed through the ball seat hole.
The present invention compared with prior art, the beneficial effect that has is: (1) crush speed is fast, compares with conventional fracturing technique, fracturing technique of the present invention shortened more than one times in the pressure break time under the identical operating mode; (2) the present invention can realize the continuous multi-stage pressure break, when pressure break, can be lowered to 15 groups of efficient pressing crack combined devices and carry out pressure break (6 every section pressure break points can carry out 90 laminations and split); (3) can realize that a pitching opens the function of a plurality of efficient pressure break sliding sleeves, significantly improve pressure break efficient; (4) simple in structure, the good airproof performance of the present invention has increased contact area and seepage area after the pressure break, and cost and exploitation reservoir are practiced thrift in maximization.
Description of drawings
Fig. 1 is a kind of structural representation that is used for the efficient pressing crack combined device of multistage section horizontal well of the present invention;
Fig. 2 is the structural representation of efficient pressure break sliding sleeve 7 of the efficient pressing crack combined device of multistage section horizontal well;
Fig. 3 is the front apron tomograph of efficient pressure break sliding sleeve 7 in the efficient pressing crack combined device of multistage section horizontal well;
Fig. 4 is the C type ball seat tomograph of efficient pressure break sliding sleeve 7 in the efficient pressing crack combined device of multistage section horizontal well.
Among the figure: 1. guide shoe float shoe, screen casing composite set, 2. ball seat, 3. pressure reduction sliding sleeve, 4. open hole packer, the 5. stifled pressure break sliding sleeve of ball, 6. small-sized open hole packer; 7. efficient pressure break sliding sleeve, 8. compound pitching, 9. extension hanger, 10. hydraulic anchor composite set, 11. tubing strings, 12. sleeve pipes; 13. top connection, 14. sealing rings, 15. resistance blocks, 16. front aprons, 17. backboards; 18. jet connects sliding sleeves before 19., connects sliding sleeve in 20., 21. shear pins, and 22. backs connect sliding sleeves; 23. lower contact, 24.C type ball seat, 25. shear pin plates, 26. grooves, 27. front aprons are topped bar; 28. preceding connection sliding sleeve is got out of a predicament or an embarrassing situation, 29. front apron groovings, 30. backboard annular grooves, 31. backboard steps, 32.C type ball seat grooving.
The specific embodiment
By shown in Figure 1; A kind of efficient pressing crack combined device that is used for multistage section horizontal well; Form by open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, the stifled pressure break sliding sleeve of ball; It is characterized in that: open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, the stifled pressure break sliding sleeve of ball, open hole packer connect successively; Formed second section efficient pressing crack combined device; Second section efficient pressing crack combined device upper end is connected with identical the 3rd section of structure to the 16 section efficient pressing crack combined device, and the lower end is connected with first section conventional fracturing device.
By illustrated in figures 1 and 2; The top connection of efficient pressure break sliding sleeve with preceding be connected sliding sleeve be threaded, preceding connection sliding sleeve lower end connects the sliding sleeve upper end in connecting, middle connection sliding sleeve lower end be equipped with the back connect sliding sleeve, after connection sliding sleeve lower end be rotary with lower contact through screw thread; Topping bar and preceding be connected getting out of a predicament or an embarrassing situation of sliding sleeve and match on the front apron; The front apron lower end contacts with the backboard upper end, and the backboard lower end contacts with the upper end of C type ball seat, and middle connection sliding sleeve afterbody has a shear pin hole to pin with shear pin plate fixed shear; Top connection is equipped with sealing ring with preceding being connected between the sliding sleeve, front apron is equipped with two sealing rings and a resistance block with preceding being connected between the sliding sleeve.
By shown in Figure 3, the front apron lower end has four front apron groovings, and is connected with backboard, and in order to opening jet, the upper end external diameter is greater than the lower end external diameter, and has the twice circumferential groove.
By shown in Figure 4, there are five ball seat groovings in the C type ball seat outside, and the middle part has circular hole, and radially has radial slot along circular hole.
During construction, transform requirement, the present invention in multistage pressure break kit running string, is delivered to the design level position according to the technology raising the output of horizontal bare hole well; The turn on pump pitching is sprained to press and is set hydraulic anchor composite set 10, extension hanger 9, open hole packer 4, small-sized open hole packer 6, extension hanger 9 packing levels respectively; Throw the compound pitching 8 of the first order and be pumped to tubing string 11 lowermost end ball seats 2 places, pressure rising driving pressure difference sliding sleeve 3 is opened first section of pressure break; Throw the compound pitching 8 in the second level, be pumped in the efficient pressure break sliding sleeve 7, compound pitching 8 drops on the C type ball seat 24; Pressure rises, and C type ball seat 24 back row promote shear pin plate 25 and move, and shear pin 21 is cut off subsequently; C type ball seat 24 continues to promote shear pin plate 25 and gets into groove 26; Shear pin plate 25 drops on lower contact 23 upper ends and stops to slide subsequently, because C type ball seat grooving 32 ball seat holes increase, compound pitching 8 is smoothly through C type ball seats 24 during through groove 26 for C type ball seat 24; C type ball seat 24 has 3 ~ 8 C type ball seat groovings 32 so that the ball seat bore dia increases, and opens efficient pressure break sliding sleeve 7; Same principle is opened efficient pressure break sliding sleeve 7 subsequently; Open the stifled pressure break sliding sleeve 5 of ball at last, resistance block 15 with preceding be connected sliding sleeve 19 interior side contacts, play certain drag effect; Promoting front apron 16 when reaching certain pressure in the pipe slides; Front apron 16 top bar 27 and 28 the initial distance of getting out of a predicament or an embarrassing situation be consistent basically with the middle initial distance that is connected between sliding sleeve 20 upper ends with backboard 17 lower end steps 31, pressure rises to one regularly, the front aprons 16 in 5 efficient pressure break sliding sleeves 7 promote backboards 17 and move; Front apron grooving 29 carries out pressing crack construction after moving to jet 18, can process 3 ~ 6 front apron groovings 29 for making things convenient for the pressing crack construction requirement; Owing between 5 efficient pressure break sliding sleeves 7 and the stifled pressure break sliding sleeve 5 of ball the packing layer by layer of 5 small-sized open hole packers 6 being arranged, the fracturing fluid between layer and the layer can not flow each other, and efficient significantly improves; Same principle continues to drop into the big slightly compound pitching 8 of model again, can be lowered to 15 groups of efficient pressing crack combined devices in the tubing string 11 at most, 6 every group pressure break points, and totally 90 laminations split; After pressure break is intact, can be lowered to milling tool milling C type ball seat 24, the aerogenesis of each interval, apocenosis passage are opened fully, form maximum diameter completion gas production passage at last.

Claims (4)

1. efficient pressing crack combined device that is used for multistage section horizontal well; Form by open hole packer, efficient pressure break sliding sleeve, small-sized open hole packer, the stifled pressure break sliding sleeve of ball; It is characterized in that: open hole packer (4), efficient pressure break sliding sleeve (7), small-sized open hole packer (6), efficient pressure break sliding sleeve (7), small-sized open hole packer (6), efficient pressure break sliding sleeve (7), small-sized open hole packer (6), efficient pressure break sliding sleeve (7), small-sized open hole packer (6), efficient pressure break sliding sleeve (7), small-sized open hole packer (6), the stifled pressure break sliding sleeve (5) of ball, open hole packer (4) connect successively; Formed second section efficient pressing crack combined device; Second section efficient pressing crack combined device upper end is connected with identical the 3rd section of structure to the 16 section efficient pressing crack combined device, and the lower end is connected with first section conventional fracturing device.
2. a kind of efficient pressing crack combined device that is used for multistage section horizontal well according to claim 1; It is characterized in that: the top connection (13) of efficient pressure break sliding sleeve (7) with preceding be connected sliding sleeve (19) be threaded, preceding connection sliding sleeve (19) lower end connects sliding sleeve (20) upper end in connecting, middle connection sliding sleeve (20) lower end be equipped with the back connect sliding sleeve (22), after connection sliding sleeve (22) lower end be rotary with lower contact (23) through screw thread; Top bar (27) of front apron (16) match with get out of a predicament or an embarrassing situation (28) that preceding are connected sliding sleeve (19); Front apron (16) lower end contacts with backboard (17) upper end; Backboard (17) lower end contacts with the upper end of C type ball seat (24); Middle sliding sleeve (20) afterbody that connects has a shear pin hole with shear pin plate (25) fixed shear pin (21); Top connection (13) is equipped with sealing ring (14) with preceding being connected between the sliding sleeve (19), front apron (16) is equipped with two sealing rings (14) and a resistance block (15) with preceding being connected between the sliding sleeve (19).
3. according to claim 1 and 2 described a kind of efficient pressing crack combined devices that are used for multistage section horizontal well; It is characterized in that: front apron (16) lower end has four front apron groovings (29); And be connected with backboard (17); In order to opening jet (18), the upper end external diameter is greater than the lower end external diameter, and has the twice circumferential groove.
4. according to claim 1 and 2 described a kind of efficient pressing crack combined devices that are used for multistage section horizontal well, it is characterized in that: there are five ball seat groovings (32) in C type ball seat (24) outside, and the middle part has circular hole, and radially has radial slot along circular hole.
CN201210006134.5A 2012-01-06 2012-01-06 High-efficiency fracturing combined device for multi-stage horizontal well CN102518419B (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102808584A (en) * 2012-07-27 2012-12-05 中国石油天然气股份有限公司 Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method
CN102979495A (en) * 2012-12-28 2013-03-20 中国石油集团渤海钻探工程有限公司 Multi-cluster current limiting fracturing string of open hole horizontal well and fracturing method thereof
CN102979497A (en) * 2012-11-20 2013-03-20 中国石油大学(北京) Device and method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing
CN103806837A (en) * 2012-11-12 2014-05-21 中国石油天然气股份有限公司 Well completion technology of oil field horizontal well
CN103883280A (en) * 2014-03-25 2014-06-25 中国石油集团渤海钻探工程有限公司 Multistage fracturing and exploitation control sliding sleeve and well completion tail pipe string structure
CN104100250A (en) * 2013-04-15 2014-10-15 中国石油化工股份有限公司 Integrated pipe column system and fracturing process method for staged fracturing well completion of open hole horizontal well
US8943944B2 (en) 2011-12-15 2015-02-03 Tong Oil Tools Co., Ltd Structure for gunpowder charge in multi-frac composite perforating devices
US8960289B2 (en) 2009-11-11 2015-02-24 Tong Oil Tools Co., Ltd. Combined fracturing and perforating method and device for oil and gas well
US9027667B2 (en) 2009-11-11 2015-05-12 Tong Oil Tools Co. Ltd. Structure for gunpowder charge in combined fracturing perforation device
CN104790934A (en) * 2015-04-03 2015-07-22 中国石油化工股份有限公司 Coal bed gas horizontal well exploitation process
CN104863562A (en) * 2015-05-12 2015-08-26 山西蓝焰煤层气集团有限责任公司 Broken and soft low-permeability coal bed horizontal well staged fracturing technology
US9297243B2 (en) 2010-12-29 2016-03-29 Tong Oil Tools Co., Ltd Composite perforation method and device with propping agent
US9297242B2 (en) 2011-12-15 2016-03-29 Tong Oil Tools Co., Ltd. Structure for gunpowder charge in multi-frac composite perforating device
CN106382108A (en) * 2016-10-21 2017-02-08 河南神华能源工程有限公司 Fracturing and blockage-removal production increase method for oil-gas well based on CO2 gas phase fracturing technique
CN108222884A (en) * 2016-12-15 2018-06-29 中国石油天然气股份有限公司 Pitching simulator and method

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9027667B2 (en) 2009-11-11 2015-05-12 Tong Oil Tools Co. Ltd. Structure for gunpowder charge in combined fracturing perforation device
US8960289B2 (en) 2009-11-11 2015-02-24 Tong Oil Tools Co., Ltd. Combined fracturing and perforating method and device for oil and gas well
US9297243B2 (en) 2010-12-29 2016-03-29 Tong Oil Tools Co., Ltd Composite perforation method and device with propping agent
US8943944B2 (en) 2011-12-15 2015-02-03 Tong Oil Tools Co., Ltd Structure for gunpowder charge in multi-frac composite perforating devices
US9297242B2 (en) 2011-12-15 2016-03-29 Tong Oil Tools Co., Ltd. Structure for gunpowder charge in multi-frac composite perforating device
CN102808584B (en) * 2012-07-27 2015-05-06 中国石油天然气股份有限公司 Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method
CN102808584A (en) * 2012-07-27 2012-12-05 中国石油天然气股份有限公司 Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method
CN103806837A (en) * 2012-11-12 2014-05-21 中国石油天然气股份有限公司 Well completion technology of oil field horizontal well
CN102979497A (en) * 2012-11-20 2013-03-20 中国石油大学(北京) Device and method for immovable-string type packer-free sliding-sleeve hydraulic-jet pulsed acid fracturing
CN102979495A (en) * 2012-12-28 2013-03-20 中国石油集团渤海钻探工程有限公司 Multi-cluster current limiting fracturing string of open hole horizontal well and fracturing method thereof
CN102979495B (en) * 2012-12-28 2016-06-29 中国石油集团渤海钻探工程有限公司 Many bunches of Limited entry fracturing tubing strings of open-hole horizontal well and fracturing process thereof
CN104100250A (en) * 2013-04-15 2014-10-15 中国石油化工股份有限公司 Integrated pipe column system and fracturing process method for staged fracturing well completion of open hole horizontal well
CN103883280B (en) * 2014-03-25 2017-06-16 中国石油集团渤海钻探工程有限公司 Multistage fracturing and controlling sliding sleeve and completion tail pipe string structure
CN103883280A (en) * 2014-03-25 2014-06-25 中国石油集团渤海钻探工程有限公司 Multistage fracturing and exploitation control sliding sleeve and well completion tail pipe string structure
CN104790934A (en) * 2015-04-03 2015-07-22 中国石油化工股份有限公司 Coal bed gas horizontal well exploitation process
CN104863562A (en) * 2015-05-12 2015-08-26 山西蓝焰煤层气集团有限责任公司 Broken and soft low-permeability coal bed horizontal well staged fracturing technology
CN106382108A (en) * 2016-10-21 2017-02-08 河南神华能源工程有限公司 Fracturing and blockage-removal production increase method for oil-gas well based on CO2 gas phase fracturing technique
CN106382108B (en) * 2016-10-21 2019-07-16 河南神华能源工程有限公司 Well fracturing and removal and stimulation method based on CO2 gas phase fracturing technique
CN108222884A (en) * 2016-12-15 2018-06-29 中国石油天然气股份有限公司 Pitching simulator and method

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