CN113653463B - Sliding sleeve assembly and construction tubular column - Google Patents
Sliding sleeve assembly and construction tubular column Download PDFInfo
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- CN113653463B CN113653463B CN202010399014.0A CN202010399014A CN113653463B CN 113653463 B CN113653463 B CN 113653463B CN 202010399014 A CN202010399014 A CN 202010399014A CN 113653463 B CN113653463 B CN 113653463B
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- sleeve
- ball
- sliding sleeve
- sealing
- outer sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention relates to the technical field of oil extraction engineering, and discloses a sliding sleeve assembly and a construction pipe column. The sliding sleeve assembly comprises a ball interception sliding sleeve and at least one ball passing sliding sleeve, wherein the at least one ball passing sliding sleeve is coaxially connected to the front of the ball interception sliding sleeve, and the ball interception sliding sleeve comprises: the ball passing sliding sleeve is configured to push the first sealing inner sleeve to move to the rear section of the first outer sleeve through the pressure of the fracturing ball so as to open the first guide port and release the fracturing ball into the rear ball passing sliding sleeve or the ball cutting sliding sleeve; the ball interception sliding sleeve is configured to push the second sealing inner sleeve to move to the rear section of the second outer sleeve through the pressure of the fracturing ball so as to open the second diversion port and block the rear port of the second outer sleeve. The sliding sleeve assembly can fully open the ball passing sliding sleeve and the ball intercepting sliding sleeve through one ball throwing, no level difference exists among the sliding sleeves, and the construction section number of the construction pipe column can be increased on the premise of not changing the extremely bad fracturing ball, so that the productivity advantage of an oil-gas well is fully exerted.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering, in particular to a sliding sleeve assembly and a construction tubular column comprising the sliding sleeve assembly.
Background
In the development process of oil and gas wells, staged fracturing/acidification is often adopted to realize the yield increase of the oil and gas wells. Construction strings for fracturing/acidizing are typically run using multi-stage sliding sleeve tools. However, the multistage sliding sleeves used at present can only be opened every time a ball is thrown, and the sliding sleeves have step differences, so that the multistage sliding sleeves are required to be opened through fracturing balls with different size step differences, and the fracturing balls cannot be infinitely small or infinitely large due to the limitation of the size of a well completion string, so that the number of stages of the grading of the sliding sleeves is limited, the number of construction stages is limited, and the productivity advantage of an oil-gas well cannot be fully exerted.
Disclosure of Invention
The invention aims to provide a sliding sleeve assembly and a construction pipe column comprising the sliding sleeve assembly, so as to solve the problems.
In order to achieve the above object, according to one aspect of the present invention, there is provided a sliding sleeve assembly including a ball interception sliding sleeve and at least one ball passing sliding sleeve coaxially connected to the front of the ball interception sliding sleeve, wherein:
the ball passing sliding sleeve comprises a first outer sleeve and a first sealing inner sleeve, a first guide opening is formed in the front section wall of the first outer sleeve, the first sealing inner sleeve is coaxially connected in the first outer sleeve and seals the first guide opening, and the ball passing sliding sleeve is configured to push the first sealing inner sleeve to move to the rear section of the first outer sleeve through the pressure of a fracturing ball so as to open the first guide opening and release the fracturing ball to the rear part of the ball passing sliding sleeve or the ball cutting sliding sleeve;
the ball cutting sliding sleeve comprises a second outer sleeve and a second sealing inner sleeve, a second guide opening is formed in the front section wall of the second outer sleeve, the second sealing inner sleeve is coaxially connected in the second outer sleeve and seals the second guide opening, and the ball cutting sliding sleeve is configured to push the second sealing inner sleeve to move to the rear section of the second outer sleeve through the pressure of the fracturing ball so as to open the second guide opening and seal the rear port of the second outer sleeve.
Optionally, the ball passing sliding sleeve includes a compression inner sleeve coaxially sleeved in the first outer sleeve and abutting against the front end face of the first sealing inner sleeve, an annular groove matched with the compression inner sleeve is formed on the inner wall of the first outer sleeve, which is located behind the first diversion port, the front end of the compression inner sleeve can abut against the fracturing ball in a sealing manner so as to move backwards together with the fracturing ball and the first sealing inner sleeve, and when the compression inner sleeve moves to the annular groove, the compression inner sleeve can return to a natural state and is embedded in the annular groove so as to allow the fracturing ball to enter the first sealing inner sleeve.
Optionally, the compression inner sleeve comprises a ring member having an opening and a sealing band connecting the two open ends of the ring member, the sealing band being configured to break when the ring member loses compression force and returns to a natural state.
Optionally, the ball passing sliding sleeve comprises a first connector, the first connector is coaxially inserted into the front end of the first outer sleeve, the inner diameter of the first connector is larger than the outer diameter of the fracturing ball, and a first abutting surface abutting against the front end surface of the compression inner sleeve is arranged in the first connector.
Optionally, the ball-cutting sliding sleeve comprises a second connector, the second connector is coaxially inserted into the front end of the second outer sleeve, the inner diameter of the second connector is larger than the outer diameter of the fracturing ball, and a second abutting surface abutting against the front end surface of the second sealing inner sleeve is arranged in the second connector.
Optionally, a first stop surface is formed on an inner wall of the rear section of the first outer sleeve, and the first stop surface can abut against a rear end surface of the first sealing inner sleeve to prevent the first sealing inner sleeve from being separated from the first outer sleeve backwards.
Optionally, a second stop surface is formed on an inner wall of the rear section of the second outer sleeve, and the second stop surface can abut against a rear end surface of the second inner seal sleeve to prevent the second inner seal sleeve from being separated from the second outer sleeve backwards.
Optionally, the ball-cutting sliding sleeve comprises a detent structure arranged to limit the second inner seal sleeve against movement relative to the second outer sleeve when the second inner seal sleeve moves to the rear section of the second outer sleeve.
Optionally, the first inner seal sleeve is connected to the first outer sleeve by a first shear pin, and the second inner seal sleeve is connected to the second outer sleeve by a second shear pin.
In another aspect, the present invention provides a construction string comprising the sliding sleeve assembly described above.
Through the technical scheme, the ball passing sliding sleeve and the ball intercepting sliding sleeve can be completely opened through one ball throwing, no level difference exists among the sliding sleeves, the construction section number of the construction pipe column can be increased on the premise of not changing the extremely bad fracturing ball, the multi-cluster multi-stage transformation requirement in the oil-gas transformation process is met, and therefore the productivity advantage of an oil-gas well is fully exerted. In addition, the sliding sleeve assembly is simple and compact in structure, convenient to assemble and produce, high in practicability, low in sliding sleeve opening difficulty and reliable in opening mode.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a cross-sectional view of one embodiment of a ball passing sleeve of the present invention wherein a first flow port is in a sealed condition;
FIG. 2 is a schematic view of the first baffle orifice of FIG. 1 in an open state;
FIG. 3 is a cross-sectional view of one embodiment of a truncated ball sleeve of the present invention wherein the second flow port is in a sealed condition;
FIG. 4 is a schematic view of the second diversion port in FIG. 3 in an open state;
FIG. 5 is a schematic view of the compression inner sleeve of FIG. 1;
FIG. 6 is a schematic illustration of the compression sleeve of FIG. 5 returning to its natural state;
fig. 7 is a schematic illustration of an acidizing string installed in a horizontal well according to one embodiment of the present invention.
Description of the reference numerals
10-ball passing sliding sleeve, 11-first outer sleeve, 111-first guide port, 112-first stop surface, 113-annular groove, 12-first sealing inner sleeve, 13-compression inner sleeve, 131-annular piece, 132-sealing band, 14-first shear pin, 15-first sealing ring, 16-first joint, 161-first abutment surface, 20-ball cutting sliding sleeve, 21-second outer sleeve, 211-second guide port, 212-second stop surface, 22-second sealing inner sleeve, 23-clamping mechanism, 231-first tooth, 232-second tooth, 24-second shear pin, 25-second sealing ring, 26-second joint, 261-second abutment surface, 30-fracturing ball, 40-guide shoe, 50-tubular column, 51-tubular column nipple, 60-centralizer.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the present invention, unless otherwise specified, the term "front" is used to refer to the left side as shown in the drawings, and the term "rear" is used to refer to the right side as shown in the drawings. "inner and outer" means inner and outer relative to the contour of the respective parts themselves.
The first aspect of the present invention provides a sliding sleeve assembly, the sliding sleeve assembly comprising a ball interception sliding sleeve 20 and at least one ball passing sliding sleeve 10, the at least one ball passing sliding sleeve 10 being coaxially connected to the front of the ball interception sliding sleeve 20, wherein:
the ball passing sliding sleeve 10 comprises a first outer sleeve 11 and a first sealing inner sleeve 12, a first guide opening 111 is formed in the front section wall of the first outer sleeve 11, the first sealing inner sleeve 12 is coaxially connected in the first outer sleeve 11 and seals the first guide opening 111, and the ball passing sliding sleeve 10 is configured to push the first sealing inner sleeve 12 to move to the rear section of the first outer sleeve 11 through the pressure holding of the fracturing ball 30 so as to open the first guide opening 111 and release the fracturing ball 30 into the ball passing sliding sleeve 10 or the ball intercepting sliding sleeve 20 at the rear;
the ball cutting sliding sleeve 20 comprises a second outer sleeve 21 and a second sealing inner sleeve 22, a second flow guide port 211 is formed in the front section wall of the second outer sleeve 21, the second sealing inner sleeve 22 is coaxially connected in the second outer sleeve 21 and seals the second flow guide port 211, and the ball cutting sliding sleeve 20 is configured to push the second sealing inner sleeve 22 to move to the rear section of the second outer sleeve 21 through the pressure of the fracturing ball 30 so as to open the second flow guide port 211 and block the rear port of the second outer sleeve 21.
In the foregoing, it will be appreciated that the inner diameter of the first seal inner sleeve 12 is greater than the outer diameter of the fracturing ball 30, and that the fracturing ball 30 can enter the first seal inner sleeve 12 and move through the first seal inner sleeve 12 and the first outer sleeve 11 into the rear ball passing or intercepting sleeve 10, 20. The inner diameter of the second seal inner sleeve 22 is smaller than the outer diameter of the fracturing ball 30, and the fracturing ball 30 cannot enter the second seal inner sleeve 22, so that the second seal inner sleeve 22 can be pushed to move and the rear port of the second outer sleeve 21 can be plugged.
Through the technical scheme, the ball passing sliding sleeve 10 and the ball intercepting sliding sleeve 20 can be completely opened through one ball throwing, no level difference exists among the sliding sleeves, the construction section number of a construction pipe column can be increased on the premise that the fracture ball 30 is extremely bad, the multi-cluster multi-stage transformation requirement in the oil-gas transformation process is met, and therefore the productivity advantage of an oil-gas well is fully exerted. In addition, the sliding sleeve assembly is simple and compact in structure, convenient to assemble and produce, high in practicability, low in sliding sleeve opening difficulty and reliable in opening mode.
In the present invention, in order to enable the fracturing ball 30 to push the first inner sealing sleeve 12 to move backward and enter the first inner sealing sleeve 12 after opening the first conduction port 111, as shown in fig. 1 and 2, the ball passing sliding sleeve 10 may include a compression inner sleeve 13 coaxially sleeved in the first outer sleeve 11 and abutting against the front end surface of the first inner sealing sleeve 12 (that is, the compression inner sleeve 13 is arranged in front of the first outer sleeve 11), an annular groove 113 adapted to the compression inner sleeve 13 is formed on the inner wall of the first outer sleeve 11 located behind the first conduction port 111, the front end of the compression inner sleeve 13 can abut against the fracturing ball 30 in a sealing manner to move backward together with the fracturing ball 30 and the first inner sealing sleeve 12, and the compression inner sleeve 13 can return to a natural state to be embedded in the annular groove 113 when moving to the annular groove 113 to allow the fracturing ball 30 to enter the first inner sealing sleeve 12.
In the above description, it will be understood that the outer diameter of the compression inner sleeve 13 is equal to the outer diameter of the first sealing inner sleeve 12, the inner diameter of the compression inner sleeve 13 is smaller than the inner diameter of the first sealing inner sleeve 12, the inner diameter of the compression inner sleeve 13 is smaller than the outer diameter of the fracturing ball 30, and the inner diameter of the compression inner sleeve 13 returned to the natural state is larger than the outer diameter of the fracturing ball 30.
In the present invention, the compression inner sleeve 13 may have any structure capable of achieving the above-described functions. According to one embodiment of the present invention, as shown in fig. 5 and 6, the compression inner sleeve 13 may include a ring member 131 having an opening and a sealing band 132 connecting both open ends of the ring member 131, the sealing band 132 being configured to be broken when the ring member 131 is restored to a natural state by losing a compression force. Of course, the compression inner sleeve 13 may also include only an annular member 131 having an opening, with the two open ends of the annular member 131 being butt sealed in the compressed state.
In the present invention, as shown in fig. 1 and 2, the ball passing sliding sleeve 10 may further include a first connector 16, the first connector 16 is coaxially inserted into the front end of the first outer sleeve 11, the inner diameter of the first connector 16 is larger than the outer diameter of the fracturing ball 30, and a first abutting surface 161 abutting against the front end surface of the compression inner sleeve 13 is disposed in the first connector 16. The first abutment surface 161 can limit the compression inner sleeve 13 and prevent the compression inner sleeve from moving forward, so that the compression inner sleeve 13 and the first sealing inner sleeve 12 are pushed by the fracturing ball 30, and meanwhile, the stability of the structure of the ball sliding sleeve 10 is improved. The particular mating structure of first coupling 16 with first outer sleeve 11 may be seen in FIGS. 1 and 2, wherein first coupling 16 may be threadably engaged with the forward end of first outer sleeve 11. It should be noted, however, that fig. 1 and 2 are merely exemplary, and that first coupling 16 and first outer sleeve 11 may be coupled by other suitable structures.
In the present invention, as shown in fig. 3 and 4, the ball-cutting sliding sleeve 20 may further include a second connector 26, the second connector 26 is coaxially inserted into the front end of the second outer sleeve 21, the inner diameter of the second connector 26 is larger than the outer diameter of the fracturing ball 30, and a second abutment surface 261 abutting against the front end surface of the second sealing inner sleeve 22 is disposed in the second connector 26. The second abutment surface 261 can limit the second sealing inner sleeve 22 and prevent the second sealing inner sleeve 22 from moving forward, so that the fracturing ball 30 can push the second sealing inner sleeve 22, and meanwhile, the stability of the structure of the ball cutting sliding sleeve 20 is improved. The specific mating structure of the second connector 26 with the second outer sleeve 21 can be seen in fig. 3 and 4, wherein the second connector 26 can be screwed with the front end of the second outer sleeve 21. It should be noted that fig. 3 and 4 are only exemplary, and the second joint 26 and the second outer sleeve 21 may be connected by other suitable structures.
In the present invention, in order to prevent the first inner seal sleeve 12 from continuing to move rearward to be separated from the first outer sleeve 11, as shown in fig. 2, a first stopper surface 112 may be formed on an inner wall of a rear section of the first outer sleeve 11, the first stopper surface 112 being capable of abutting against a rear end surface of the first inner seal sleeve 12 to prevent the first inner seal sleeve 12 from being separated rearward from the first outer sleeve 11. In addition, in order to prevent the second inner seal sleeve 22 from continuing to move rearward to be separated from the second outer sleeve 21, as shown in fig. 4, a second stopper surface 212 may be formed on the inner wall of the rear section of the second outer sleeve 21, the second stopper surface 212 being capable of abutting against the rear end surface of the second inner seal sleeve 22 to prevent the second inner seal sleeve 22 from being separated rearward from the second outer sleeve 21.
In order to prevent the second inner seal sleeve 22 from freely moving after opening the second guide opening 211, the ball-cutting sliding sleeve 20 may further include a locking structure 23, where the locking structure 23 is configured to limit the second inner seal sleeve 22 to prevent movement relative to the second outer sleeve 21 when the second inner seal sleeve 22 moves to the rear section of the second outer sleeve 21. Wherein, the clamping structure can be similar to the matching structure of the compression inner sleeve 13 and the annular groove 113. Of course, the detent structure may also be adapted to the ball passing sleeve 10 to limit movement of the first inner seal sleeve 12 within the ball passing sleeve 10.
In the case of a ball-catching slide 20 having a second stop surface 212, the detent structure 23 can serve only to limit the forward movement of the second inner sealing sleeve 22. In this case, the detent structure 23 may be a mating saw tooth structure provided on the outer wall of the second inner seal sleeve 22 and the inner wall of the second outer sleeve 21, so as to achieve the purpose that the second inner seal sleeve 22 can only be moved backward and cannot be moved forward. As shown in fig. 3 and 4, for example, the detent structure 23 includes a first tooth 231 provided on the inner wall of the second outer sleeve 21 and a second tooth 232 provided on the outer wall of the second inner seal sleeve 22, and the first tooth 231 and the second tooth 232 extend obliquely in opposite directions, respectively.
In the present invention, as shown in FIG. 1, a first inner seal sleeve 12 may be coupled to a first outer sleeve 11 by a first shear pin 14. The first sealing inner sleeve 12 may be sleeved with a first sealing ring 15 to form a seal with the inner wall of the first outer sleeve 11 through the first sealing ring 15. The first outer sleeve 11 may be provided with a plurality of first guide ports 111, and the plurality of first guide ports 111 may be arranged at intervals along the circumferential direction of the first outer sleeve 11. As shown in fig. 3, the second inner seal sleeve 22 may be connected to the second outer sleeve 21 by a second shear pin 24. The second sealing inner sleeve 22 may be sleeved with a second sealing ring 25 to form a seal with the inner wall of the second outer sleeve 21 by the second sealing ring 25. The second outer sleeve 21 may be provided with a plurality of second flow guiding ports 211, and the plurality of second flow guiding ports 211 may be arranged at intervals along the circumferential direction of the second outer sleeve 21.
In the invention, the ball passing sliding sleeve 10 and the ball interception sliding sleeve 20 can be connected through a pipe column nipple 51. Specifically, the rear end of the ball passing sleeve 10 may be connected to the rear pipe nipple 51 through a screw structure provided at the rear end of the first outer sleeve 11, and the front end of the ball passing sleeve 10 may be connected to the front pipe nipple 51 through the first joint 16. The rear end of the ball-cutting sliding sleeve 20 may be connected to the rear pipe nipple 51 through a screw structure provided at the rear end of the second outer sleeve 21, and the front end of the ball-cutting sliding sleeve 20 may be connected to the front pipe nipple 51 through the second joint 26.
When the sliding sleeve assembly is used, the fracturing ball 30 firstly enters the first joint 16 of the foremost ball passing sliding sleeve 10 and moves backwards under the action of pressure to be abutted against the front end of the compression inner sleeve 13, the fracturing ball 30 cannot pass through the inner diameter of the compression inner sleeve 13, a holding pressure is formed at the front end of the compression inner sleeve 13, when the thrust of the fracturing ball 30 is larger than the shearing strength of the first shearing pin 14 for fixing the first sealing inner sleeve 12, the first shearing pin 14 is sheared, the fracturing ball 30 pushes the compression inner sleeve 13 and the first sealing inner sleeve 12 to move backwards, and therefore the first guide port 111 on the wall of the first outer sleeve 11, sealed by the first sealing inner sleeve 12, is exposed, and a flow channel is established. When the compression inner sleeve 13 is pushed by the fracturing ball 30 to the annular groove 113 of the first outer sleeve 11, the compression inner sleeve 13 returns to the natural state by losing the compressive force applied thereto by the first outer sleeve 11 and is embedded in the annular groove 113 to allow the fracturing ball 30 to pass. Since the inner diameter of the first seal inner sleeve 12 is larger than the outer diameter of the fracturing ball 30, the fracturing ball 30 is pushed through the first seal inner sleeve 12 and into the rear sliding sleeve through the ball sliding sleeve 10. Due to the design of first stop surface 112 within first outer sleeve 11, first inner seal sleeve 12 is restrained within first outer sleeve 11 from continuing to move rearward. According to the same principle as above, the fracturing ball 30 opens the first diversion ports 111 of the ball passing sliding sleeves 10 and smoothly passes through the ball passing sliding sleeves 10 and finally enters the rear ball intercepting sliding sleeve 20.
When the fracturing ball 30 moves into the ball interception sliding sleeve 20, as the inner diameter of the second sealing inner sleeve 22 of the ball interception sliding sleeve 20 is smaller than the outer diameter of the fracturing ball 30, the fracturing ball 30 cannot pass through, a pressure holding pressure is formed at the front end of the second sealing inner sleeve 22, when the pushing force of the fracturing ball 30 is larger than the shearing strength of the second shearing pin 24 for fixing the second sealing inner sleeve 22, the second shearing pin 24 is sheared, the fracturing ball 30 pushes the second sealing inner sleeve 22 to move backwards, and therefore a second diversion opening 211 on the wall of the second outer sleeve 21, sealed by the second sealing inner sleeve 22, is exposed, and a flow channel is established. Due to the design of the second stop surface 212 in the second outer sleeve 21, the second inner seal sleeve 22 is limited in the second outer sleeve 21 and cannot continue to move backwards; meanwhile, since the outer diameter of the fracturing ball 30 is larger than the inner diameter of the second sealing inner sleeve 22, the fracturing ball 30 cannot enter the second sealing inner sleeve 22 and continuously moves backwards, so that the plugging of the rear port of the second outer sleeve 21 is realized. In addition, the second inner seal sleeve 22 cannot move forward due to the detent structure provided in the ball-cutting sleeve 20.
A second aspect of the present invention provides a construction string comprising a sliding sleeve assembly as described above.
The construction pipe column can be used for fracturing or acidizing of oil and gas wells. The construction pipe column can comprise a plurality of groups of sliding sleeve assemblies, and the plurality of groups of sliding sleeve assemblies can be sequentially connected and arranged along the extending direction of the oil gas well. It should be noted that there may be a great difference between the sets of sliding sleeve assemblies in the construction string to accommodate the different inner diameters of the well sections, each set of sliding sleeve assemblies being configured with a matched fracturing ball 30. During construction, a plurality of fracturing balls 30 at different stages can be respectively put into the well, a multi-stage multi-cluster flow channel is established, and the multi-stage multi-cluster construction of the well is realized. Wherein, the fracturing ball 30 is a soluble ball, and the whole construction pipe column is smooth after the fracturing ball 30 is melted, thereby being beneficial to normal production of oil gas.
In the following, an embodiment of the construction string according to the present invention will be described by taking an acidizing construction as an example. The construction tubular column is an acidification tubular column for a horizontal well, the acidification tubular column comprises a plurality of construction tubular sections which are sequentially connected from front to back, each construction tubular section is provided with a sliding sleeve assembly, each group of ball passing sliding sleeve 10 and ball intercepting sliding sleeve 20 in the sliding sleeve assembly are respectively provided with an acid liquid flow channel (comprising a first diversion port 111 and a second diversion port 211), each group of sliding sleeve assemblies are provided with fracturing balls 30, and the sliding sleeve assemblies can be matched with the fracturing balls 30 to sequentially open the acid liquid flow channels of the ball passing sliding sleeve 10 and the ball intercepting sliding sleeve 20 and block the rear ports of the ball intercepting sliding sleeve 20.
Through the technical scheme, the acidizing tubular column is simple and reliable in structure and high in stability, the acid inlet number of the horizontal well can be increased, the problem of high uniform acidizing difficulty of the horizontal well is solved, efficient and uniform multistage multi-cluster acidizing is performed on the horizontal well, and the productivity of the horizontal well is improved. Moreover, because the fracturing ball 30 seals the rear port of the ball-intercepting sliding sleeve 20, the sealing between adjacent sliding sleeve assemblies can be realized, and therefore, the acidizing string does not need to be sealed by a packer.
In the present invention, as shown in fig. 7, the sliding sleeve assembly and the sliding sleeve assembly may be connected by a pipe string nipple 51. The acidizing string may also include a guide shoe 40, the guide shoe 40 being connected to the rear of the plurality of construction pipe sections. The guide shoe 40 can guide the acidizing string to smoothly go down to the bottom of the well, and a through hole for acid liquor to flow out is arranged on the guide shoe 40. Additionally, the acidizing string may also include a string 50 connected to the front of the plurality of construction pipe sections and a centralizer 60 disposed between adjacent construction pipe sections.
In the acidizing tubular column, the quantity of sliding sleeve subassembly can be decided according to actual construction demand. Specifically, for example, the open hole completion horizontal well shown in fig. 7 can be constructed by using a three-stage sliding sleeve assembly to divide the horizontal well into four sections, the first section is acidized by the guide shoe 40, and the II, III, IV section is subjected to multi-stage multi-cluster acidizing by using the three-stage sliding sleeve assembly. The sliding sleeve assembly of the II well section comprises two ball passing sliding sleeves 10 and one ball intercepting sliding sleeve 20, the sliding sleeve assembly of the III well section comprises two ball passing sliding sleeves 10 and one ball intercepting sliding sleeve 20, and the sliding sleeve assembly of the IV well section comprises one ball passing sliding sleeve 10 and one ball intercepting sliding sleeve 20.
A third aspect of the present invention provides a method of acidizing a horizontal well, carried out using an acidizing string as described above, said method comprising the steps of:
s1, installing the acidizing string in the horizontal well;
s2, throwing a fracturing ball 30 into the acidizing tubular column, pumping the fracturing ball 30 into the ball passing sliding sleeve 10 of the first construction tubular section, sequentially opening the acid liquid flow channels of the ball passing sliding sleeve 10 and the ball interception sliding sleeve 20 through pressure holding of the fracturing ball 30, and limiting the fracturing ball 30 in the ball interception sliding sleeve 20 to block the rear port of the ball interception sliding sleeve 20;
s3, acid liquor is introduced into the acidification pipe column, and acidification is carried out on a second well section of the horizontal well, which corresponds to the first construction pipe section;
and S4, completing acidification of a third well section and other well sections in front of the third well section of the horizontal well in the same way as in the steps S2 and S3.
It should be noted that the above method is applicable to the case where the acidizing string does not include the guide shoe 40, and in this case, the second leg is the first leg to be constructed of the horizontal well. When the acidizing string comprises the guide shoe 40, the method further comprises the step of introducing acid liquor into the acidizing string before the step S2, and acidizing the I-th well section of the horizontal well through the guide shoe 40. In this case, the first section of the horizontal well is the first section to be constructed. It will be appreciated that the acidizing string is run sequentially in a back-to-front direction on the horizontal well.
Of course, in the present invention, the acidification method may also include, for example, a preparation work performed before the step S1 and a subsequent work performed after the step S4. Since these are conventional working steps and are not improvements of the present invention, they will not be described in detail. In addition, the acidizing method may further include, before the step S2, circulating well flushing with a well-killing solution (for example, 2% KCL aqueous solution) matched with the formation pressure gradient until the performance of the water solution at the inlet and outlet is consistent, and closing the well to wait for acidizing construction; acid liquor is prepared according to the requirements, and the high-pressure pipeline pressure test is completed by connecting ground construction equipment so as to meet the construction conditions.
In construction, the fracturing ball 30 is thrown into the pipe column 50 from the wellhead, the fracturing ball 30 can move to the sliding sleeve assembly under the action of gravity and fluid thrust (surface pumping), and the power of the fracturing ball 30 in the acidizing pipe column is from the bottom hole pressure raised by continuous pumping of surface equipment.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (5)
1. The utility model provides a sliding sleeve assembly, its characterized in that, sliding sleeve assembly includes interception sliding sleeve (20) and at least one ball sliding sleeve (10), at least one ball sliding sleeve (10) coaxial coupling in the place ahead of interception sliding sleeve (20), wherein:
the ball passing sliding sleeve (10) comprises a first outer sleeve (11) and a first sealing inner sleeve (12), a first guide opening (111) is formed in the front section cylinder wall of the first outer sleeve (11), the first sealing inner sleeve (12) is coaxially connected into the first outer sleeve (11) and seals the first guide opening (111), and the ball passing sliding sleeve (10) is configured to push the first sealing inner sleeve (12) to move to the rear section of the first outer sleeve (11) through pressure holding of a fracturing ball (30) so as to open the first guide opening (111) and release the fracturing ball (30) into the ball passing sliding sleeve (10) or the ball cutting sliding sleeve (20) at the rear;
the ball interception sliding sleeve (20) comprises a second outer sleeve (21), a second sealing inner sleeve (22) and a second joint (26), a second guide port (211) is formed in the front section cylinder wall of the second outer sleeve (21), the second sealing inner sleeve (22) is coaxially connected in the second outer sleeve (21) and seals the second guide port (211), the ball interception sliding sleeve (20) is configured to push the second sealing inner sleeve (22) to move to the rear section of the second outer sleeve (21) through the pressure blocking of the fracturing ball (30) so as to open the second guide port (211) and block the rear port of the second outer sleeve (21), the second joint (26) is coaxially inserted in the front end of the second outer sleeve (21), the inner diameter of the second joint (26) is larger than the outer diameter of the fracturing ball (30), and a second abutting surface (261) abutting against the front end surface of the second sealing inner sleeve (22) is arranged in the second joint (26).
The ball passing sliding sleeve (10) comprises a compression inner sleeve (13), the compression inner sleeve (13) is coaxially sleeved in the first outer sleeve (11) and is abutted against the front end face of the first sealing inner sleeve (12), an annular groove (113) matched with the compression inner sleeve (13) is formed on the inner wall, located behind the first guide port (111), of the first outer sleeve (11), the front end of the compression inner sleeve (13) can be abutted with the fracturing ball (30) in a sealing mode so as to move backwards together with the fracturing ball (30) and the first sealing inner sleeve (12), and when the compression inner sleeve (13) moves to the annular groove (113), the compression inner sleeve (13) can return to a natural state and is embedded in the annular groove (113) so as to allow the fracturing ball (30) to enter the first sealing inner sleeve (12);
the ball passing sliding sleeve (10) comprises a first connector (16), the first connector (16) is coaxially inserted into the front end of the first outer sleeve (11), the inner diameter of the first connector (16) is larger than the outer diameter of the fracturing ball (30), and a first abutting surface (161) which abuts against the front end surface of the compression inner sleeve (13) is arranged in the first connector (16);
the ball-cutting sliding sleeve (20) comprises a clamping structure (23), wherein the clamping structure (23) is used for limiting the second sealing inner sleeve (22) to prevent the second sealing inner sleeve (22) from moving relative to the second outer sleeve (21) when the second sealing inner sleeve (22) moves to the rear section of the second outer sleeve (21);
the compression inner sleeve (13) comprises an annular member (131) with an opening and a sealing band (132) connecting the two open ends of the annular member (131), wherein the sealing band (132) is configured to be broken when the annular member (131) loses compression force and returns to a natural state.
2. The sliding sleeve assembly according to claim 1, wherein a first stop surface (112) is formed on an inner wall of the rear section of the first outer sleeve (11), the first stop surface (112) being capable of abutting against a rear end surface of the first inner seal sleeve (12) to prevent the first inner seal sleeve (12) from being pulled back out of the first outer sleeve (11).
3. The sliding sleeve assembly according to claim 1, wherein a second stop surface (212) is formed on an inner wall of the rear section of the second outer sleeve (21), the second stop surface (212) being capable of abutting against a rear end surface of the second inner seal sleeve (22) to prevent the second inner seal sleeve (22) from being pulled back out of the second outer sleeve (21).
4. A sliding sleeve assembly according to any one of claims 1-3, wherein the first inner seal sleeve (12) is connected to the first outer sleeve (11) by a first shear pin (14) and the second inner seal sleeve (22) is connected to the second outer sleeve (21) by a second shear pin (24).
5. A construction string comprising the sliding sleeve assembly of any one of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399014.0A CN113653463B (en) | 2020-05-12 | 2020-05-12 | Sliding sleeve assembly and construction tubular column |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010399014.0A CN113653463B (en) | 2020-05-12 | 2020-05-12 | Sliding sleeve assembly and construction tubular column |
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| CN113653463A CN113653463A (en) | 2021-11-16 |
| CN113653463B true CN113653463B (en) | 2023-09-29 |
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| US9702221B2 (en) * | 2013-03-15 | 2017-07-11 | Peak Completion Technologies, Inc. | Downhole tools with ball trap |
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| CN113653463A (en) | 2021-11-16 |
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