CN211874445U - Well cementation is soluble toe end sliding sleeve for well completion - Google Patents
Well cementation is soluble toe end sliding sleeve for well completion Download PDFInfo
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- CN211874445U CN211874445U CN201922282802.7U CN201922282802U CN211874445U CN 211874445 U CN211874445 U CN 211874445U CN 201922282802 U CN201922282802 U CN 201922282802U CN 211874445 U CN211874445 U CN 211874445U
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- 238000007789 sealing Methods 0.000 claims description 42
- 239000012530 fluid Substances 0.000 abstract description 18
- 239000000956 alloy Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 49
- 239000007788 liquid Substances 0.000 description 25
- 238000006073 displacement reaction Methods 0.000 description 21
- 238000005422 blasting Methods 0.000 description 7
- 239000003129 oil well Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 206010024796 Logorrhoea Diseases 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model relates to an oil field development field, concretely relates to well cementation is soluble toe end sliding sleeve top connection for well completion, include: a first through hole is axially formed in the upper joint; the lower joint, insert in the top connection lower extreme, the bottom connection overlaps the face with the top connection and forms annular cavity, the axial has through-hole two in the bottom connection, the top connection internal face and the outer wall of bottom connection are located annular cavity position respectively and are opened first recess and second recess. The utility model discloses because put into the soluble alloy material endotheca of high strength between upper and lower joint, ensure that the well cementation bumps and presses process tool, tubular column and satisfy and hold the high pressure requirement, the later stage is from dissolving, realizes the inside and outside intercommunication of instrument. Through the wall surface concave treatment on the wall bodies of the upper joint and the lower joint, the inner sleeve is effectively isolated from well fluid, meanwhile, the pipe body weakness is artificially preset, when the inner sleeve is fed into a sealed cavity and dissolved, the inner sleeve can be easily pressurized and opened, and the opening is reliable.
Description
Technical Field
The utility model relates to an oil field development field, concretely relates to well cementation is soluble toe end sliding sleeve for well completion.
Background
After well cementation, a shaft is a closed cavity, and in order to provide a liquid inlet channel for later fracturing transformation, a sleeve at the toe end of a well completion pipe column and an external cement sheath thereof need to be opened to communicate the shaft with the stratum. For the current wells with the reservoir depth of 3500m and the horizontal section length of 1500m, the purpose of carrying a downhole crawler by using a coiled tubing or a cable is realized by adopting hydraulic or thermal perforating gun for perforating, for the wells with the reservoir depth of 3500m and the horizontal section length of 1500m, the mode has the defects that the crawler is ineffective due to the stress application and the pressing of the coiled tubing due to the flexible characteristic of the coiled tubing, the cleanliness of a well bore is required by the crawler, so that a tool cannot be delivered to the toe end of a tubular column and cannot be reconstructed, the problem becomes a bottleneck problem in the development field of long-horizontal section well cementation horizontal wells at present, in order to solve the technical problem, the establishment of a liquid flow channel at the toe end of the tubular column is actively explored to be combined with casing operation for omitting the perforating operation of the tool, so that the current situation of delivery without technical means is avoided, and meanwhile, the long operation time and low operation efficiency, high construction cost and high risk.
Patent publication No. CN107288602A discloses an automatically controlled toe end fracturing sliding sleeve, and this utility model is based on unlimited electromagnetic wave control, and its characteristics are: the mechanism and the structure are complex, the wall thickness and the inner diameter of the tool are small; the cost of the electromagnetic element is high; the operation is complex; the reliability of the tool is greatly influenced by well depth and well temperature, the tool is easy to lose efficacy, and the tool cannot be opened after losing efficacy.
Patent publication No. CN105089598A discloses a burst starting sliding sleeve. The utility model discloses a start-up formula fracturing control valve that provides strikes the rupture disk that presets in the garrulous instrument through well head pressurization mode, and liquid gets into piston chamber and promotes the piston, exposes the fracturing port and establishes the fracturing passageway. The defects are that an air cavity exists, the wall thickness and the inner diameter of the tool are small, certain influence is caused on subsequent well cementation, and more importantly, the air cavity structure has high sealing requirement and is easy to lose efficacy, and the tool cannot be opened after losing efficacy.
And patent publication No. CN105064973A discloses a blasting type fracturing control valve, on the basis of opening the sliding sleeve through the conventional mode, a standby opening mode (namely, detonating the blasting bomb) is added, if the sliding sleeve can not be normally opened, the pumping pressure of high-pressure liquid can be improved, the detonating device is started, then the blasting bomb is detonated, a hole is blasted on the sliding sleeve inner cylinder and the sliding sleeve outer cylinder, and the opening of the sliding sleeve is realized. The probability of the sliding sleeve being successfully opened is improved. However, the blasting bomb therein has certain destructiveness and dangerousness, is easy to damage the surrounding casing pipe, and has higher risk of the sliding sleeve opening operation.
Utility model people discover that prior art has following technical problem at least:
in various casing joint tool modes provided by the prior art, a port is opened through the action of mechanisms such as an air cavity, a rupture disk, an electric control element and the like, and due to the existence of the mechanism design, the tool is complex, the wall thickness is thick, the inner drift diameter is greatly changed compared with a casing which is put in, the well cementation difficulty is large, and meanwhile, due to the characteristic that an electromagnetic element is easy to lose efficacy when meeting high temperature and humidity, the tool is applied to complex and variable well conditions, the stability is uncontrollable, and no rescue measures are needed after the failure; and the blasting type is adopted, so that certain destructiveness and dangerousness are realized, and particularly, the operation of a gas well has greater potential safety hazard.
SUMMERY OF THE UTILITY MODEL
The utility model provides a well cementation is soluble toe end sliding sleeve for well completion has solved the passageway foot power that can only adopt conventional blasting formula to make pit shaft and stratum, has realized stable controllable getting through the mode.
The utility model provides a technical problem can adopt following technical scheme to realize:
a well cementation is soluble toe end sliding sleeve for completion, characterized by, includes:
the upper joint is internally and axially provided with a first through hole;
the upper end of the lower joint is inserted into the upper joint, an annular cavity is formed by the overlapped surfaces of the lower joint and the upper joint, a second through hole is axially formed in the lower joint, a first groove and a second groove are formed in the positions, located in the annular cavity, of the inner wall surface of the upper joint and the outer wall surface of the lower joint respectively, the first groove is located above the second groove, the distance between the inner bottom surface of the first groove and the outer wall surface of the upper joint is smaller than the distance between the inner bottom surface of the second groove and the inner wall surface of the lower joint, the first through hole and the second through hole are coaxial, and the inner diameters of the first through hole and the second;
the inner sleeve is arranged in the annular cavity, the inner wall surface and the outer wall surface of the inner sleeve are respectively in sealing contact with the outer wall surface of the lower joint and the inner wall surface of the upper joint, the inner sleeve is positioned above the second groove, and the outer circumferential surface of the inner sleeve completely covers the first groove.
The top end of the upper connector is provided with an inner tapered thread.
The bottom end of the lower connector is provided with an external taper thread.
The upper joint is sequentially provided with a first step, a second step and a third step with gradually increasing inner diameters from the upper part of the inner circumferential surface to the lower part of the inner circumferential surface of the upper joint, the lower joint is sequentially provided with a fourth step, a fifth step and a sixth step with gradually decreasing outer diameters from the lower part of the outer circumferential surface to the upper part of the outer circumferential surface of the lower joint, the first step is in contact with the sixth step, the third step is in contact with the fourth step, an annular cavity is formed between the second step and the fifth step, the inner sleeve is positioned in the annular cavity, the inner wall surface and the outer wall surface of the inner sleeve are respectively in contact with the fifth step and the second step, and the first groove and the second groove are respectively positioned on the wall surface of the second step and the wall surface of.
The first step wall face is provided with first sealing ring, first sealing ring and sixth step wall face contact, the fourth step wall face is provided with the second sealing ring, the second sealing ring and third step wall face contact, first step wall face and sixth step wall face threaded connection department are located first sealing ring below.
And the second stepped wall surface and the fifth stepped wall surface are respectively and symmetrically provided with a third sealing ring and a fourth sealing ring, and the third sealing ring and the fourth sealing ring are respectively in contact with the inner wall surface and the outer wall surface of the inner sleeve.
The second step wall surface and the fifth step wall surface are respectively provided with an upper limiting table and a lower limiting table, and the top end and the bottom end of the inner sleeve are respectively contacted with the upper limiting table and the lower limiting table.
The inner sleeve is made of soluble alloy material, and the components of the soluble alloy material are Mg50.8-51.5%, Ai37.4-38.4%, 202 rare earth 10.7-11.4% and Ba0.4-0.7%; are all in mass percent.
The use method of the soluble toe end sliding sleeve for well cementation and completion at least comprises any one of the soluble toe end sliding sleeves for well cementation and completion and further comprises the following steps
Firstly, connecting an upper joint with an upper casing through an inner conical thread, connecting an outer conical thread of a lower joint with a lower casing, and then putting the lower joint into a shaft; the toe end sliding sleeve is put into a preset position in the oil well along with the shaft casing,
secondly, after entering the well, introducing a preset amount of cement into the oil well through an oil well casing; cement is extruded in the forward direction, a well cementing rubber plug is thrown in, displacing fluid is added after the well cementing rubber plug flows into an annular space from the inside of the pipe through a floating hoop and a floating shoe, the cement continuously returns upwards, the cement is contacted with the outer wall surfaces of an upper joint and a lower joint along with the increase of the upward returning height, the cement continuously returns upwards when the upward returning is fast in place, the first groove and the outer wall surface of the upper joint are broken, the cement enters the first groove and enters a cavity formed by the top end of an inner sleeve, a first step and a fifth step, the cement is limited by a third sealing ring and a fourth sealing ring to enter the cavity formed by the bottom end of the inner sleeve, the annular cement continuously returns upwards, when the displacing fluid in the pipe pushes the rubber plug to move to a collision pressure short joint, the wellhead is continuously pressurized, the pressure of the inner wall surface of the displacing fluid lower joint is increased, the lower joint and the second groove are broken, the displacing fluid enters the cavity formed by the bottom end, continuously pressurizing to ensure that the displacement liquid pushes the rubber plug to be in collision pressure and short-circuit to the blocking seal of the rubber plug, and simultaneously, the displacement liquid reacts with the inner sleeve;
thirdly, after the cement waiting for coagulation is 0.5 day, the cement in a cavity formed by the top end of the inner sleeve and the first step and the fifth step is coagulated to form a small-volume cement plug;
fourthly, within 9 days after the displacement liquid reacts with the inner sleeve, before well cementation is carried out, the inner sleeve is dissolved until the pressure bearing capacity is not lower than 35MPa, and then the displacement liquid is gradually dissolved and scattered to a cavity formed by the bottom end of the inner sleeve and the second step and the fifth step, and the displacement liquid upwelles to fill an annular space and is contacted with cement solidified in the cavity formed by the top end of the inner sleeve and the first step and the fifth step;
and fifthly, pressurizing a well mouth to replace the cement retained in the first groove by hydraulic breakdown and the cement solidified in a cavity formed by the top end of the inner sleeve and the first step and the fifth step by the hydraulic breakdown, so that the first groove is communicated with the outer wall surface of the upper joint, and a shaft and a formation liquid flow channel are established.
The utility model has the advantages that: because the high-strength soluble alloy material inner sleeve is arranged between the upper joint and the lower joint, the tool and the pipe column in the well cementation bumping and pressing process can meet the high pressure bearing requirement, and the tool can be automatically dissolved in the later period to realize the internal and external communication of the tool.
Through the wall surface concave treatment on the wall bodies of the upper joint and the lower joint, the inner sleeve is effectively isolated from well fluid, meanwhile, the pipe body weakness is artificially preset, when the inner sleeve is fed into a sealed cavity and dissolved, the inner sleeve can be easily pressurized and opened, and the opening is reliable.
The casing jointing tool overcomes the defects of the existing casing jointing tool that the mechanism design is complex, the wall thickness is thick, the inner drift diameter is greatly changed compared with a casing running in, and the difficulty of well cementation is high.
The controllable temporary plugging is carried out on the port by adopting the high-strength soluble material inner sleeve, the use of an expensive rupture disk valve or an electric control element is omitted, the uncertainty of controlling the opening of the sliding sleeve through the actions of mechanisms such as an air cavity, a rupture disk, the electric control element and the like in the prior art is avoided, the blasting danger is avoided, the tool structure is simplified, the tool drift diameter is larger, the opening is reliable, simple, safe and economical, the success rate of establishing a liquid flow channel at the toe end of the shaft of the well cementation completion well is improved, the problem that the liquid flow channel at the toe end of the horizontal well cementation multistage fracturing shaft is difficult to establish is solved, and the use is reliable, safe and convenient.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-upper joint; 101-upper limiting table; 102-a first groove; 111-a first step; 112-a second step; 113-third step; 121-a first seal ring; 122-a third seal ring; 2-lower joint; 201-a lower limit station; 202-a second groove; 211 a fourth step; 212-fifth step; 213 sixth step; 221 a second seal ring; 222 a fourth seal ring; 3-inner sleeve; 4, a first through hole; and 5, a second through hole.
Detailed Description
Example 1:
referring to fig. 1, is the utility model discloses embodiment 1's structural schematic, a well cementation is soluble toe end sliding sleeve for well completion, its characterized in that includes:
the upper joint 1 is internally provided with a first through hole in the axial direction;
the upper end of the lower joint 2 is inserted into the upper joint 1, an annular cavity is formed by the overlapped surface of the lower joint 2 and the upper joint 1, a second through hole is axially formed in the lower joint 2, a first groove 102 and a second groove 202 are formed in the positions, located in the annular cavity, of the inner wall surface of the upper joint 1 and the outer wall surface of the lower joint 2 respectively, the distance between the inner bottom surface of the first groove 102 and the outer wall surface of the upper joint 1 is smaller than the distance between the inner bottom surface of the second groove 202 and the inner wall surface of the lower joint 2, the first through hole and the second through hole are coaxial, and the inner diameters of the first through hole and the second through hole;
the inner sleeve 3 is arranged in the annular cavity, the inner wall surface and the outer wall surface of the inner sleeve 3 are respectively in sealing contact with the outer wall surface of the lower joint 2 and the inner wall surface of the upper joint 1, the inner sleeve 3 is positioned above the second groove 202, and the outer circumferential surface of the inner sleeve 3 completely covers the first groove 102.
In actual use: the upper joint 1 is connected with a staged fracturing tool in series, the lower joint 2 is in threaded connection with a bumping short joint, then the cement is put into a shaft, after the cement is put into a well, cement is extruded in a forward direction for a period of time, then a well cementation rubber plug is put into the well, displacement fluid is injected, the rubber plug is pushed to move downwards and enters a through hole I, meanwhile, as the well cementation rubber plug pushes the cement, the cement continuously moves upwards, the cement passes through the outer wall surface of the lower joint 2 and the outer wall surface of the upper joint 1 when moving upwards, the pressure born by the upper joint 1 and the lower joint 2 is increased along with the increase of the upward height of the cement, so that the space between the first groove 102 and the upper joint 1 is broken, the cement enters an annular cavity, as the inner sleeve 3 is arranged in the annular cavity, the cement cannot move downwards to form a limit, the cement stops at the top end of the inner sleeve 3, and the inlet is, the inner wall surface of the lower connector 2 and the second groove 202 are broken, the displacement fluid enters the annular cavity body through the broken part of the lower connector and the second groove 202, the displacement fluid cannot return upwards due to the limitation of the inner sleeve 3, then the pressurization is continued, the displacement fluid pushes the well cementation rubber plug to be in collision pressure and short-circuit to the blocking sealing, the displacement fluid reacts with the inner sleeve 3, after the cement is solidified, the displacement fluid dissolves the inner sleeve 3, then the wellhead is pressurized, the displacement fluid is in contact with the cement through the annular cavity, the displacement fluid penetrates the cement under the action of the pressure, the displacement fluid enters the upper connector 1 through the broken part of the first groove 102 and the upper connector 1, and the shaft and a stratum fluid flow channel are established.
In the embodiment, the pressure-bearing wall thickness between the first groove 102 and the upper joint 1 is lower than the pressure of the annular cement hydrostatic column.
In the embodiment, the wall thickness pressure between the inner wall surface of the lower joint 2 and the second groove 202 is lower than 30+ hydrostatic column pressure in the pipe.
Example 2:
referring to fig. 1: the top end of the upper connector 1 is provided with an inner tapered thread.
In actual use: the upper connector 1 is connected with the staged fracturing tool string through the inner conical threads, and the inner conical threads of the upper connector 1 are convenient to connect with other tools.
Example 3:
referring to fig. 1: the bottom end of the lower joint 2 is provided with an external taper thread.
In actual use: the outer conical thread of the lower joint 2 is connected with the contact pressure short connection thread, and the outer conical thread of the lower joint 2 is convenient to be connected with other tools.
Example 4:
referring to fig. 1: the inner sleeve 3 is positioned in the annular cavity, the inner wall surface and the outer wall surface of the inner sleeve 3 are respectively contacted with the fifth step 212 and the second step 112, and the first groove 102 and the second groove 202 are respectively positioned on the wall surface of the second step 112 and the wall surface of the fifth step 212.
In actual use: the stepped structures of the upper joint 1 and the lower joint 2 can form an annular cavity, a shaft and a formation liquid flow channel can be conveniently established, the inner sleeve 3 can be conveniently installed, meanwhile, the first step 111 and the sixth step 213 are in contact, the third step 113 and the fourth step 211 are in contact, the pressure born by the upper joint 1 and the lower joint 2 in the radial direction can be increased, the annular cavity cannot be deformed, meanwhile, the inner sleeve 3 is supported between the second step 112 and the fifth step 212, the radial pressure of the overlapped part of the upper joint 1 and the lower joint 2 can be increased, and the annular cavity is prevented from being deformed.
Example 5:
referring to fig. 1: the wall surface of the first step 111 is provided with a first sealing ring 121, the first sealing ring 121 is in wall surface contact with a sixth step 213, the wall surface of the fourth step 211 is provided with a second sealing ring 221, the second sealing ring 221 is in wall surface contact with the third step 113, the wall surface of the first step 111 is in threaded connection with the wall surface of the sixth step 213, and the threaded connection position of the wall surface of the first step 111 and the wall surface of the sixth step 213 is positioned below the first sealing ring 121.
In actual use: first sealing ring 121 can prevent to replace liquid or cement and get into annular cavity through first ladder 111 and sixth ladder 213 contact surface, can prevent to replace liquid or cement and get into annular cavity through third ladder 113 and fourth ladder 211 contact surface simultaneously through second sealing ring 221, first ladder 111 wall and sixth ladder 213 wall threaded connection, can increase top connection 1 and lower clutch 2 joint strength, prevent to break away from when the operation, first ladder 111 wall and sixth ladder 213 wall threaded connection department are located first sealing ring 121 below, can prevent to replace liquid and contact first ladder 111 wall and sixth ladder 213 wall threaded connection department early, make the corrosion more serious.
Example 6:
referring to fig. 1: the wall surface of the second step 112 and the wall surface of the fifth step 212 are symmetrically provided with a third sealing ring 132 and a fourth sealing ring 232, and the third sealing ring 132 and the fourth sealing ring 232 are respectively in contact with the inner wall surface and the outer wall surface of the inner sleeve 3.
In actual use: the third sealing ring 132 and the fourth sealing ring 232 can prevent the displacement fluid and the cement from passing between the inner sleeve 3 and the second step 112 and the fifth step 212 when the displacement fluid and the cement give pressure, and the sealing performance before the cement is solidified is ensured.
Example 7:
referring to fig. 1: the wall surface of the second step 112 and the wall surface of the fifth step 212 are respectively provided with an upper limiting table 101 and a lower limiting table 201, and the top end and the bottom end of the inner sleeve 3 are respectively contacted with the upper limiting table 101 and the lower limiting table 201.
In actual use: the inner sleeve 3 can be limited from moving in the annular cavity body by the upper limit table 101 and the lower limit table 201, so that the expected effect cannot be achieved.
Example 8:
the inner sleeve 3 is made of soluble alloy materials, and the components of the soluble alloy materials are Mg50.8-51.5%, Ai37.4-38.4%, 202 rare earth 10.7-11.4% and Ba0.4-0.7%; are all in mass percent.
In actual use: mg50.8-51.5%, Ai37.4-38.4%, 202 rare earth 10.7-11.4% and Ba0.4-0.7% are mixed, so that the inner sleeve 3 can meet the pressure-bearing requirement and cannot be dissolved prematurely.
Example 9:
referring to fig. 1, the use method of the soluble toe end sliding sleeve for well cementation and completion at least comprises the soluble toe end sliding sleeve for well cementation and completion, and also comprises the following steps
Firstly, an upper joint 1 is connected with an upper casing through an inner conical thread, and an outer conical thread of a lower joint 2 is connected with a lower casing and then is put into a shaft; the toe end sliding sleeve is put into a preset position in the oil well along with the shaft casing,
secondly, after entering the well, introducing a preset amount of cement into the oil well through an oil well casing; cement is extruded in the forward direction, a well cementing rubber plug is thrown in, displacing liquid is added, when the cement flows to an annular space from a pipe through a floating hoop and a floating shoe, the cement continuously returns upwards, the cement is contacted with the outer wall surfaces of an upper joint 1 and a lower joint 2 along with the increase of the upward returning height, the cement further continuously returns upwards, when the upward returning is fast and in place, the first groove 102 and the outer wall surface of the upper joint 1 are broken, the cement enters the first groove 102 and enters a cavity formed by the top end of an inner sleeve 3 and a first step 111 and a fifth step 212, the cement is limited by a third sealing ring 132 and a fourth sealing ring 232 to enter the cavity formed by the bottom end of the inner sleeve 3 and a second step 112 and a fifth step 212, the annular cement continuously returns upwards, when the displacing liquid in the pipe pushes the rubber plug to move to a collision pressure short joint, the wellhead continues to pressurize, the pressure is increased, the pressure of the inner wall surface of the displacing liquid lower joint 2 is increased, the lower joint 2 and the second groove 202 are, then continuously pressurizing to ensure that the displacement liquid pushes the rubber plug to be in collision pressure and short-circuit to the blocking seal of the rubber plug, and simultaneously the displacement liquid reacts with the inner sleeve 3;
thirdly, after 2-3 days of cement waiting for setting, the cement in the cavity formed by the top end of the inner sleeve 3 and the first step 111 and the fifth step 212 is set to form a small-volume cement plug;
fourthly, within 9 days after the displacement liquid reacts with the inner sleeve 3, before the well cementation is carried out, the inner sleeve 3 is dissolved until the pressure bearing pressure is not lower than 35MPa, and then the displacement liquid is gradually dissolved and scattered into a cavity formed by the bottom end of the inner sleeve 3 and the second step 112 and the fifth step 212, and the displacement liquid is upwelled to fill an annular space and is contacted with the cement solidified in the cavity formed by the top end of the inner sleeve 3 and the first step 111 and the fifth step 212;
and fifthly, pressurizing the wellhead to replace the cement retained in the first groove 102 by hydraulic breakdown and the cement solidified in the cavity formed by the top end of the inner sleeve 3 and the first step 111 and the fifth step 212 by hydraulic breakdown, so that the first groove 102 is communicated with the outer wall surface of the upper joint 1, and a shaft and a formation liquid flow channel are established.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all such changes are within the scope of the present invention.
Claims (7)
1. A well cementation is soluble toe end sliding sleeve for completion, characterized by, includes:
the upper joint (1) is internally provided with a first through hole in the axial direction;
the upper end of the lower joint (2) is inserted into the upper joint (1), an annular cavity is formed by the overlapped surfaces of the lower joint (2) and the upper joint (1), a second through hole is axially formed in the lower joint (2), a first groove (102) and a second groove (202) are formed in the annular cavity of the inner wall surface of the upper joint (1) and the outer wall surface of the lower joint (2), the first groove (102) is located above the second groove (202), the distance between the inner bottom surface of the first groove (102) and the outer wall surface of the upper joint (1) is smaller than the distance between the inner bottom surface of the second groove (202) and the inner wall surface of the lower joint (2), the first through hole and the second through hole are coaxial, and the inner diameters of the first through hole and the second through hole are the same;
the inner sleeve (3) is arranged in the annular cavity, the inner wall surface and the outer wall surface of the inner sleeve (3) are respectively in sealing contact with the outer wall surface of the lower joint (2) and the inner wall surface of the upper joint (1), the inner sleeve (3) is positioned above the second groove (202), and the outer circumferential surface of the inner sleeve (3) completely covers the first groove (102).
2. The soluble toe sliding sleeve for well cementation and completion as claimed in claim 1, wherein: the top end of the upper joint (1) is provided with an inner tapered thread.
3. The soluble toe sliding sleeve for well cementation and completion as claimed in claim 1, wherein: the bottom end of the lower joint (2) is provided with an external taper thread.
4. The soluble toe sliding sleeve for well cementation and completion as claimed in claim 1, wherein: the upper joint (1) is provided with a first step (111), a second step (112) and a third step (113) which have gradually increased inner diameters from the upper part of the inner circumferential surface to the lower end of the inner circumferential surface of the upper joint (1), the lower joint (2) is sequentially provided with a fourth step (211), a fifth step (212) and a sixth step (213) with gradually reduced outer diameters from the lower part of the outer circumferential surface to the upper end of the outer circumferential surface of the lower joint (2), the first step (111) is in contact with a sixth step (213), the third step (113) is in contact with a fourth step (211), an annular cavity is formed between the second step (112) and the fifth step (212), the inner sleeve (3) is positioned in the annular cavity, the inner wall surface and the outer wall surface of the inner sleeve (3) are respectively contacted with the fifth step (212) and the second step (112), the first groove (102) and the second groove (202) are respectively positioned on the wall surface of the second step (112) and the wall surface of the fifth step (212).
5. The soluble toe sliding sleeve for well cementation and completion as claimed in claim 4, wherein: first ladder (111) wall is provided with first sealing ring (121), first sealing ring (121) and sixth ladder (213) wall contact, fourth ladder (211) wall is provided with second sealing ring (221), second sealing ring (221) and third ladder (113) wall contact, first ladder (111) wall and sixth ladder (213) wall threaded connection department are located first sealing ring (121) below.
6. The soluble toe sliding sleeve for well cementation and completion as claimed in claim 4, wherein: and the wall surface of the second step (112) and the wall surface of the fifth step (212) are respectively and symmetrically provided with a third sealing ring (132) and a fourth sealing ring (232), and the third sealing ring (132) and the fourth sealing ring (232) are respectively in contact with the inner wall surface and the outer wall surface of the inner sleeve (3).
7. The soluble toe sliding sleeve for well cementation and completion as claimed in claim 6, wherein: the wall surface of the second step (112) and the wall surface of the fifth step (212) are respectively provided with an upper limiting table (101) and a lower limiting table (201), and the top end and the bottom end of the inner sleeve (3) are respectively contacted with the upper limiting table (101) and the lower limiting table (201).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922282802.7U CN211874445U (en) | 2019-12-18 | 2019-12-18 | Well cementation is soluble toe end sliding sleeve for well completion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922282802.7U CN211874445U (en) | 2019-12-18 | 2019-12-18 | Well cementation is soluble toe end sliding sleeve for well completion |
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| CN201922282802.7U Active CN211874445U (en) | 2019-12-18 | 2019-12-18 | Well cementation is soluble toe end sliding sleeve for well completion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021990A (en) * | 2019-12-18 | 2020-04-17 | 中国石油天然气股份有限公司 | Soluble toe end sliding sleeve for well cementation and completion and using method thereof |
| CN112647894A (en) * | 2020-12-25 | 2021-04-13 | 中石化石油工程技术服务有限公司 | Design method for improving horizontal well cementing displacement efficiency |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021990A (en) * | 2019-12-18 | 2020-04-17 | 中国石油天然气股份有限公司 | Soluble toe end sliding sleeve for well cementation and completion and using method thereof |
| CN112647894A (en) * | 2020-12-25 | 2021-04-13 | 中石化石油工程技术服务有限公司 | Design method for improving horizontal well cementing displacement efficiency |
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