CN104314546B - Staged fracturing completion tubular column and staged fracturing technique in horizontal well casing pipe - Google Patents

Staged fracturing completion tubular column and staged fracturing technique in horizontal well casing pipe Download PDF

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Publication number
CN104314546B
CN104314546B CN201410490379.9A CN201410490379A CN104314546B CN 104314546 B CN104314546 B CN 104314546B CN 201410490379 A CN201410490379 A CN 201410490379A CN 104314546 B CN104314546 B CN 104314546B
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China
Prior art keywords
sliding sleeve
staged fracturing
pipe
packer
oil pipe
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CN201410490379.9A
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CN104314546A (en
Inventor
齐月魁
王晓梅
齐振
刘长军
马英政
关月
袁照永
韩莉
王亚新
刘民
王长在
刘洪敏
聂上振
窦同伟
蔡茂佳
束文生
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Publication of CN104314546A publication Critical patent/CN104314546A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/267Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping

Abstract

The invention discloses staged fracturing completion tubular column and staged fracturing technique in horizontal well casing pipe, the technical scheme for using for:Connected by oil pipe between several staged fracturing units, each staged fracturing unit corresponds to a perforated interval for sleeve pipe respectively, the lower end of the staged fracturing unit of lower end connects hydraulic anchor A by oil pipe, and the other end of hydraulic anchor A is connected with direct-injection sliding sleeve, and direct-injection sliding sleeve is corresponding with the perforated interval of sleeve pipe;The staged fracturing unit of upper end is connected after oil pipe connects packer and spiral centering device with hydraulic anchor B, the upper end connected pipes of hydraulic anchor B;Described staged fracturing unit is sequentially connected by ball seat, packer, spiral centering device and sliding sleeve constitutes from bottom to top, and the size of inner core of sliding sleeve and ball seat is matched with the external diameter of ball sealer and increased successively from bottom to top.The present invention can realize the staged fracturing in horizontal well casing pipe with one-trip string, simplify working procedure, while insulating stratum, reduce interlayer interference, improve fracturing transformation effect.

Description

Staged fracturing completion tubular column and staged fracturing technique in horizontal well casing pipe
Technical field
The present invention relates to a kind of completion tubular column technical field, in more particularly to a kind of sleeve pipe staged fracturing completion tubular column and its Technique, the tubing string and technique are particularly well-suited to horizontal well reservoir fracturing improvement.
Background technology
Staged Fracturing Technique In Horizontal Wells are a kind of conventional oilfield stimulation measures, are particularly suited for gas reservoir and fractured reservoir Exploitation.The staged fracturing technique being applied in sleeve pipe at present mainly has bridging plug perforation staged fracturing technique and water-jet to be segmented Fracturing technology.Wherein bridging plug perforation staged fracturing technique enters bridging plug packing pit shaft, perforation, pressure break under being repeatedly, and the technique needs Many times tubing string is completed, and construction is discontinuous, and duty cycle is long.And another water-jet staged fracturing technique by entering cunning down in advance Shell type hydrajet tool, opens correspondent section sliding sleeve step by step, and after completing this grade transformation, this grade of passage of ball-off simultaneously opens next Level sliding sleeve carries out transformation operation, is constantly repeated up to complete the segmentation transformation of whole horizontal well;Although the technique can be realized one time Tubing string multistage pressure break, but due to lacking confinement system, interlayer interference is easily caused during pressure break.
The content of the invention
The present invention is directed to above-mentioned problem, there is provided staged fracturing completion tubular column, Ke Yi in a kind of horizontal well casing pipe While packing pit shaft, one-trip string realizes the staged fracturing in horizontal well casing pipe.Present invention also offers the completion tubular column Staged fracturing technique.
To achieve the above object, the technical solution adopted by the present invention is:
Staged fracturing completion tubular column in horizontal well casing pipe, is provided with completion tubular column, institute in the sleeve pipe of advance perforation Stating completion tubular column includes oil pipe, staged fracturing unit, hydraulic anchor and direct-injection sliding sleeve, leads between several described staged fracturing units The oil pipe connection is crossed, each described staged fracturing unit corresponds to a perforated interval for described sleeve pipe, described point of lower end respectively The lower end of section pressure break unit is connected by the other end and the direct-injection sliding sleeve that the oil pipe connects hydraulic anchor A, the hydraulic anchor A Connect, the direct-injection sliding sleeve is corresponding with the perforated interval of described sleeve pipe;The staged fracturing unit of upper end is connected by the oil pipe It is connected with hydraulic anchor B after packer and spiral centering device, the upper end of the hydraulic anchor B connects the oil pipe;The staged fracturing Unit is sequentially connected by ball seat, packer, spiral centering device and sliding sleeve constitutes from bottom to top, the sliding sleeve and described The size of inner core of ball seat increases successively from bottom to top, and is matched successively with the external diameter of ball sealer.
Further, the direct-injection sliding sleeve is located at the first perforated interval top of described sleeve pipe, and the sliding sleeve distinguishes position At the end perforation of described sleeve pipe perforated interval.
Further, it is provided with safety joint in the upper end of the hydraulic anchor B.
The staged fracturing technique of staged fracturing completion tubular column in horizontal well casing pipe, technique is as follows:
A, decentralization tubing string:Completion tubular column is lowered into specified location in sleeve pipe;
B, first order fracturing work:Pressurizeed from oil pipe, hydraulic anchor A and hydraulic anchor B grapplings, the whole swollen envelope of packer, directly Opened to direct-injection sliding sleeve (1), first order pressing crack construction is carried out afterwards, all packers are unsealed automatically after terminating;
C, second level fracturing work:To ball sealer A is put into oil pipe, ball sealer A is seated on sliding sleeve A, in pipe Pressurization, opens sliding sleeve A, sets up the sandblasting passage of tubing string and stratum;Now ball sealer A is dropped on ball seat A, with the cunning that comes off Set A works in coordination work, makes to realize packing positioned at the space of the second perforated interval in packer all swollen envelopes, sleeve pipe, then to the Two perforated intervals carry out second level pressing crack construction, and all packers are unsealed automatically after terminating;
D, third level fracturing work:To ball sealer B is put into oil pipe, ball sealer B is seated on sliding sleeve B, in pipe Pressurization, opens sliding sleeve B, sets up the sandblasting passage of tubing string and stratum;Now ball sealer B is dropped on ball seat B, with the cunning that comes off Set B works in coordination work, makes packer B to the whole swollen envelope of packer of upper end, positioned at the space reality of the 3rd perforated interval in sleeve pipe Now insulate, third level pressing crack construction then is carried out to the 3rd perforated interval, all packers are unsealed automatically after terminating;
Further, after the completion of all fracturing works, closing well waits pressure diffusion, open flow discharge opeing.
Further, after the open flow discharge opeing, anti-flushing well proposes the completion tubular column.
Staged fracturing completion tubular column and technique in horizontal well casing pipe of the invention, can realize horizontal well casing pipe with one-trip string Interior staged fracturing, simplifies working procedure, while insulating stratum, reduces interlayer interference, improves fracturing transformation effect.
Brief description of the drawings
Fig. 1 is completion tubular column structural representation provided in an embodiment of the present invention.
Fig. 2 is the second level pressing crack construction schematic diagram of completion tubular column provided in an embodiment of the present invention.
Fig. 3 is that whole pressing crack constructions of completion tubular column provided in an embodiment of the present invention terminate rear wellbore schematic.
Fig. 4 is that staged fracturing comes off spherically seated shift sleeve structure schematic diagram in sleeve pipe provided in an embodiment of the present invention.
Fig. 5 be Fig. 4 provided in an embodiment of the present invention A-A to sectional view (sliding sleeve be in closure state under, magnetic lock ball block Protrusion closes up).
Fig. 6 is the structural representation that sliding sleeve provided in an embodiment of the present invention is in opening.
Fig. 7 is the sectional view (sliding sleeve is under opening) of B-B direction in Fig. 6 provided in an embodiment of the present invention.
In Fig. 1-3:1. direct-injection sliding sleeve, 21. hydraulic anchor A, 31. ball seat A, 41. packer A, 51. spiral centering device A, 61. Sliding sleeve A, 32. ball seat B, 42. packer B, 52. spiral centering device B, 62. sliding sleeve B, 33. ball seat C, 43. packers C, 53. spiral centering device C, 63. sliding sleeve C, 34. ball seat D, 44. packer D, 54. spiral centering device D, 64. sliding sleeves D, 35. ball seat E, 45. packer E, 55. spiral centering device E, 65. sliding sleeve E, 36. ball seat F, 46. packer F, 56. spirals The packer of centralizer F, 66. sliding sleeve F, 47. G, 57. spiral centering device G, 22. hydraulic anchor B, 7. safety joint, 8. oil pipe, 91. ball sealer A, 92. ball sealer B, 93. ball sealer C, 94. ball sealer D, 95. ball sealer E, 96. ball sealer F, 100. completion tubulars Post, 200. sleeve pipes, 300. fracturing fractures, 101. first perforated intervals, 102. second perforated intervals, 103. the 3rd perforated intervals, 104. Four perforated intervals, 105. the 5th perforated intervals, 106. the 6th perforated intervals, 107. the 7th perforated intervals.
Specific embodiment
Staged fracturing completion tubular column in the present embodiment horizontal well casing pipe, mainly by completion tubular column 100 and ball sealer A 91 Implement to complete to the common combinations of ball sealer F 96.
As shown in figure 1, being provided with completion tubular column 100 in sleeve pipe 200;Advance perforation in sleeve pipe 200, is divided into first Perforated interval 101, the second perforated interval 102, the 3rd perforated interval 103, the 4th perforated interval 104, the 5th perforated interval 105, the 6th perforated interval 106th, the 7th perforated interval 107.Completion tubular column 100 is from bottom to top by direct-injection sliding sleeve 1, oil pipe 8, hydraulic anchor A 21, oil pipe 8, ball seat A 31st, packer A 41, spiral centering device A 51, sliding sleeve A 61, oil pipe 8, ball seat B 32, packer B 42, spiral righting Device B 52, sliding sleeve B 62, oil pipe 8, ball seat C 33, packer C 43, spiral centering device C 53, sliding sleeve C 63, oil Pipe 8, ball seat D 34, packer D 44, spiral centering device D 54, sliding sleeve D 64, oil pipe 8, ball seat E 35, packer E 45th, spiral centering device E 55, sliding sleeve E 65, oil pipe 8, ball seat F 36, packer F 46, spiral centering device F 56, come off Sliding sleeve F 66, oil pipe 8, packer G 47, spiral centering device G 57, hydraulic anchor B 22, safety joint 7, oil pipe 8 are sequentially connected; Oil pipe 8 can as needed be adjusted to different length.
The present position of direct-injection sliding sleeve 1 is the top of the first perforated interval 101, and direct-injection sliding sleeve 1 carries out first order pressure break work after opening Industry.
Ball seat A 31, packer A 41, spiral centering device A 51, sliding sleeve A 61 are placed in the bottom of the second perforated interval 102 Portion, sliding sleeve A 61 is located at the end perforation of this section;Ball seat B 32, packer B 42, spiral centering device B 52, come off cunning Set B 62 is placed in the bottom of the 3rd perforated interval 103, and sliding sleeve B 62 is located at the end perforation of this section;Ball seat C 33, packing Device C 43, spiral centering device C 53, sliding sleeve C 63 are placed in the bottom of the 4th perforated interval 104, and sliding sleeve C 63 is located at should At the end perforation of section;Ball seat D 34, packer D 44, spiral centering device D 54, sliding sleeve D 64 are placed in the 5th perforation 105 bottoms of section, sliding sleeve D 64 is located at the end perforation of this section;Ball seat E 35, packer E 45, spiral centering device E 55th, sliding sleeve E 65 is placed in the bottom of the 6th perforated interval 106, and sliding sleeve E 65 is located at the end perforation of this section;Ball seat F 36th, packer F 46, spiral centering device F 56, sliding sleeve F 66 are placed in the bottom of the 7th perforated interval 107, sliding sleeve F 66 At the end perforation of this section.
The effect of sliding sleeve A 61 to sliding sleeve F 66 is to open sandblasting passage, and pressure breaks at different levels are carried out to corresponding well section Operation.The size of inner core of sliding sleeve and ball seat is increased successively by pressure break grade, can respectively with the ball sealer of corresponding size Cooperating, makes corresponding each packer setting, and the inside of sleeve pipe 200 is insulated into several sections.
Sliding sleeve A 61 is identical to the structure of sliding sleeve F 66, and concrete structure is as follows:Including top connection 601, main body Overcoat 602, sliding sleeve 604 and lower contact 605, main body overcoat 602 are connected through a screw thread with top connection 601 and lower contact 605 respectively, And strengthen fixing by clamp-screw 606, the upper wall of main body overcoat 602 is provided with radial direction through hole sandblasting hole 6021, under main body overcoat 602 Portion's inwall is provided with groove 6022, and sliding sleeve 604 is arranged on inside main body overcoat 602, uniform radial direction through hole, hole on the wall body of sliding sleeve 604 Magnetic lock ball block 603 is inside installed, the inner end wall of magnetic lock ball block 603 is arc-shaped, and the external diameter of sliding sleeve 604 is more than in lower contact 605 Footpath, seal 608 is respectively mounted between the main body overcoat 602 and top connection 601, sliding sleeve 604 and lower contact 605;When segmentation is pressed When splitting the spherically seated sliding sleeve that comes off in closure state, sliding sleeve 604 is connected by shear pin 607 with main body overcoat 602, and sliding sleeve 604 is pressed In sandblasting hole 6021, the inner of magnetic lock ball block 603 protrudes from the inwall of sliding sleeve 604, and adjacent magnetic lock ball block inner wall edge Contact two-by-two, so as to form the projection of closed circular ring-type;When staged fracturing comes off spherically seated sliding sleeve in opening, sliding sleeve 604 lower ends are contacted with lower contact 605, and magnetic lock ball block 603 is located in groove 6022 and sliding sleeve 604.During work, ground is in tubing string Input ball sealer, the projection that magnetic lock ball block 603 is formed can accept ball sealer, reach ball sealer and magnetic lock ball block 603 Inwall intimate contact, and the material of magnetic lock ball block 3 is by magnetization treatment, realizes preventing from rolling by magnetic secure lock, So as to strengthen seal herein, liquid measure was effectively reduced.To being suppressed in tubing string, pressure acts on ball sealer and sliding sleeve 604 Shear pin 607 is gone up and passes to, until shear pin 607 is cut;Sliding sleeve 604 drives magnetic lock ball block 603 to move down, final sliding sleeve 604 contact stopping with lower contact 605 moves down;Now magnetic lock ball block 603 is contracted in groove 6022, and the inwall of sliding sleeve 604 recovers logical Footpath, ball sealer is shed on string matching instrument ball seat, such that it is able to open the swollen envelope kit packer of pressure, realizes packing well Cylinder.Meanwhile, the sandblasting hole 6021 on main body overcoat 602 is completely exposed, and sandblasting passage is set up inside and outside tubing string, can carry out sandblasting pressure Split operation.
The effect of spiral centering device A 51 to spiral centering device G 57 is to improve tubing string centralizer.
The effect of hydraulic anchor A 21 and hydraulic anchor B 22 is that completion tubular column 100 is fixed in sleeve pipe 200, prevents tubing string from altering It is dynamic.
The effect of safety joint 7 be after the completion of all fracturing works, when above carrying completion tubular column 100, the nothing if tubing string is hampered Method proposes, can pitching build the pressure and disconnect safety joint 7, so as to propose the oil pipe 8 of the above section of safety joint 7, for lower step is remedied Measure slot milling.
The external diameter of ball sealer A 91 to ball sealer F 96 is increased successively by pressure break grade, is seated in first during work corresponding In sliding sleeve, sliding sleeve is opened after suppressing, dropped to afterwards in corresponding ball seat, coordinated corresponding packing with sliding sleeve Device sets.
Completion tubular column staged fracturing technique is in horizontal well casing pipe of the present invention, first finishes the assembling of completion tubular column 100, under Enter to shooting away in advance inside the sleeve pipe 200 in hole, then sprayed, fracturing work, its step is as follows:
A, decentralization tubing string:Completion tubular column 100 is lowered into specified location in sleeve pipe 200.
B, first order fracturing work:Pressurization, hydraulic anchor A 21 and the grapplings of hydraulic anchor B 22, packer A 41 in from oil pipe 8 To the whole swollen envelopes of packer G 47, until direct-injection sliding sleeve 1 is opened, first order pressing crack construction is carried out afterwards, construction is owned after terminating Removing seal for packer.
C, second level fracturing work:Referring to Fig. 2, to ball sealer A 91 is put into oil pipe 8, ball sealer A 91 is seated in and comes off On sliding sleeve A 61, pressurizeed in pipe, open sliding sleeve A 61, set up the sandblasting passage of tubing string and stratum;Now ball sealer A 91 drop on ball seat A 31, are worked in coordination work with sliding sleeve A 61, make packer A 41 to packer G 47 all swollen Packing is realized positioned at the space of the second perforated interval 102 in envelope, sleeve pipe 200, second level pressure break then is carried out to the second perforated interval 102 Construction, all packers are unsealed automatically after construction terminates.
D, third level fracturing work:To ball sealer B 92 is put into oil pipe 8, ball sealer B 92 is seated in sliding sleeve B 62 On, pressurizeed in pipe, sliding sleeve B 62 is opened, set up the sandblasting passage of tubing string and stratum;Now ball sealer B 92 is dropped to On ball seat B 32, worked in coordination work with sliding sleeve B 62, make packer B 42 to packer G 47 all swollen envelopes, sleeve pipe Packing is realized positioned at the space of the 3rd perforated interval 103 in 200, third level pressing crack construction then is carried out to the 3rd perforated interval 103, applied Work after terminating all packers unseal automatically.
Grade fracturing work of E, fourth, fifth, six, seven:Using with second and third grade of fracturing work identical method, completion connects down The pressing crack constructions at different levels for coming.
After the completion of E, all fracturing works, closing well waits pressure diffusion, open flow discharge opeing.
F, anti-flushing well, propose completion tubular column 100, and whole technical process terminate.If running into tubing string to be hampered the feelings that cannot be proposed Condition, then can be built the pressure from ground by oil pipe 8 to pitching in tubing string, disconnect safety joint 7, so as to propose safety joint more than 7 Partial oil pipe 8, is lower step remedial measure slot milling.
So far, the construction of completion tubular column staged fracturing technique all terminates in the horizontal well casing pipe of the present embodiment, such as Fig. 3 institutes Show, fracturing fracture 300 is formed in each section of perforated interval.
It should be noted last that, above specific embodiment is merely illustrative of the technical solution of the present invention and unrestricted, Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should cover In the middle of scope of the presently claimed invention.

Claims (3)

1. in horizontal well casing pipe staged fracturing completion tubular column staged fracturing technique, it is characterised in that technique is as follows:
A, decentralization tubing string:Completion tubular column (100) is lowered into sleeve pipe (200) interior specified location;
B, first order fracturing work:Pressurization, hydraulic anchor A (21) and hydraulic anchor B (22) grappling, packer whole in from oil pipe (8) Swollen envelope, until direct-injection sliding sleeve (1) is opened, carries out first order pressing crack construction afterwards, and all packers are unsealed automatically after terminating;
C, second level fracturing work:To input ball sealer A (91) in oil pipe (8), ball sealer A (91) is seated in sliding sleeve A (61) on, pressurizeed in pipe, open sliding sleeve A (61), set up the sandblasting passage of tubing string and stratum;Now ball sealer A (91) Drop on ball seat A (31), worked in coordination work with sliding sleeve A (61), make packer all swollen envelopes, sleeve pipe (200) interior position Packing is realized in the space of the second perforated interval (102), second level pressing crack construction then is carried out to the second perforated interval (102), terminated All packers are unsealed automatically afterwards;
D, third level fracturing work:To input ball sealer B (92) in oil pipe (8), ball sealer B (92) is seated in sliding sleeve B (62) on, pressurizeed in pipe, open sliding sleeve B (62), set up the sandblasting passage of tubing string and stratum;Now ball sealer B (92) Drop on ball seat B (32), worked in coordination work with sliding sleeve B (62), make packer B (42) to the packer whole of upper end Swollen envelope, realizes packing in sleeve pipe (200) positioned at the space of the 3rd perforated interval (103), and the is then carried out to the 3rd perforated interval (103) Three-level pressing crack construction, all packers are unsealed automatically after terminating;
Staged fracturing completion tubular column in described horizontal well casing pipe, completion is provided with the sleeve pipe (200) of advance perforation Tubing string (100), the completion tubular column (100) includes oil pipe (8), staged fracturing unit, hydraulic anchor and direct-injection sliding sleeve (1), some Connected by the oil pipe (8) between the individual staged fracturing unit, each described staged fracturing unit corresponds to an institute respectively The perforated interval of sleeve pipe (200) is stated, the lower end of the staged fracturing unit of lower end connects hydraulic anchor A by the oil pipe (8) (21), the other end of the hydraulic anchor A (21) is connected with the direct-injection sliding sleeve (1), the direct-injection sliding sleeve (1) and described sleeve pipe (200) perforated interval correspondence;The staged fracturing unit of upper end connects packer and spiral centering device by the oil pipe (8) It is connected with hydraulic anchor B (22) afterwards, the upper end of the hydraulic anchor B (22) connects the oil pipe (8);The staged fracturing unit is under And on be sequentially connected by ball seat, packer, spiral centering device and sliding sleeve and constitute, the sliding sleeve and the ball seat it is interior Core size increases successively from bottom to top, and is matched successively with the external diameter of ball sealer.
2. technique according to claim 1, it is characterised in that also include:After the completion of all fracturing works, closing well is waited Pressure diffusion, open flow discharge opeing.
3. technique according to claim 2, it is characterised in that also include:After the open flow discharge opeing, anti-flushing well is proposed The completion tubular column (100).
CN201410490379.9A 2014-09-23 2014-09-23 Staged fracturing completion tubular column and staged fracturing technique in horizontal well casing pipe Active CN104314546B (en)

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