CN213297831U - Multi-stage branch well completion device - Google Patents
Multi-stage branch well completion device Download PDFInfo
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- CN213297831U CN213297831U CN202020938034.6U CN202020938034U CN213297831U CN 213297831 U CN213297831 U CN 213297831U CN 202020938034 U CN202020938034 U CN 202020938034U CN 213297831 U CN213297831 U CN 213297831U
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Abstract
The utility model provides a multistage branch well completion device, include: an underground positioning structure; the main borehole hollow whipstock is arranged on the underground positioning structure and comprises an inner sleeve and an outer sleeve, the inner sleeve is arranged in the outer sleeve, a first opening is formed in the side wall of the outer sleeve, and at least part of the inner sleeve is positioned at the first opening; the positioning suspension structure is arranged on the main borehole hollow whipstock and comprises a cylindrical body and a lining pipe, the lining pipe is arranged in the cylindrical body, a second opening is formed in the cylindrical body, the second opening is opposite to the first opening, and at least part of the lining pipe is positioned at the second opening; wherein the lining pipe is made of soluble metal material. Through the technical scheme provided by the utility model, can solve the complicated technical problem of operation of multistage branch well completion device among the prior art.
Description
Technical Field
The utility model relates to a well drilling equipment and instrument field in the oil industry particularly, relate to a multistage branch well completion device.
Background
Multilateral wells are currently wells drilled at different depths in a main wellbore for producing different depth reservoirs. The technology can increase the oil drainage area, improve the oil well yield and comprehensively reduce the oil reservoir development cost. The multilateral well technology is generally considered to be one of the leading-edge technologies with wide development prospects, which can improve the recovery ratio of oil and gas wells by using a drilling process technology, change difficult-to-use storage into movable storage and further improve the economic benefits of the oil and gas wells.
Wherein, the main well hole and the branch well hole have mechanical integrity at the connection part, and the hydraulic seal is mainly sealed by a cement sheath. This means that at the junction of the main bore and the lateral there is mechanical support provided by the casing and cementing cement, and the lateral of the grade can be fully run into both the main bore and the lateral in any workover operation. How to ensure the mechanical connectivity, hydraulic integrity and selective reentry of branch parts of the branch well is a main technical problem which restricts the technical development and application of the branch well in China. The key to multilateral well technology is completion, while reliable downhole system tools are the key to success of the completion. The quality of cement cementing at the pre-windowing part of a branch casing of the existing pre-windowing underground system of the domestic underground branch system is greatly influenced by the pre-windowing window, if the pre-windowing window is opened during cementing, cementing cement enters a branch shaft through the pre-windowing window, cement rings are not formed at the pre-windowing window and the upper part of the pre-windowing window, and the cementing quality is poor.
One of the two existing solutions is to place a section of steel liner pipe in the branch casing pre-opening window, pre-block the branch casing pre-opening window during well cementation, so that well cementation cement cannot enter the branch shaft through the pre-opening window but returns to the upper part of the branch casing as in normal well cementation, and then take out the steel liner pipe placed in the branch casing after well cementation is completed. The method has the advantages that although the well cementation quality is improved, the next drill string is needed to take out the steel liner pipe, and the main communication well hole is formed by grinding the cement in the inner core of the main well hole hollow whipstock tool and the aluminum bottom plug in the downhole permanent positioning tool through the next grinding shoe. And the other method is that a casing is put into the branch well bore, and after the branch well bore of the branch well is normally well-fixed, the main communication well bore is drilled through by using the special milling tool for the next time to mill the branch casing, the cement in the inner core of the main well bore hollow core whipstock tool and the aluminum bottom plug in the underground permanent positioning tool. The method has good cementing quality, but is difficult to operate in the underground grinding of branch borehole casings with the included angle of not more than 3 degrees with the main borehole.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a multi-stage branch completion device to solve the technical problem of complex operation of multi-stage branch completion devices in the prior art.
In order to achieve the above object, the present invention provides a multi-stage branch well completion device, comprising: an underground positioning structure; the main borehole hollow whipstock is arranged on the underground positioning structure and comprises an inner sleeve and an outer sleeve, the inner sleeve is arranged in the outer sleeve, a first opening is formed in the side wall of the outer sleeve, and at least part of the inner sleeve is positioned at the first opening; the positioning suspension structure is arranged on the main borehole hollow whipstock and comprises a cylindrical body and a lining pipe, the lining pipe is arranged in the cylindrical body, a second opening is formed in the cylindrical body, the second opening is opposite to the first opening, and at least part of the lining pipe is positioned at the second opening; wherein the lining pipe is made of soluble metal material.
Further, the multi-stage branching completion device further comprises a connecting piece which passes through the lining pipe and is connected with the cylindrical body.
Furthermore, the connecting piece is a connecting screw, a connecting through hole is formed in the lining pipe, a threaded hole is formed in the cylindrical body, and the connecting screw penetrates through the connecting through hole to be in threaded connection with the threaded hole.
Further, the connection screw is made of a dissolvable material.
Furthermore, the underground positioning structure comprises a first sleeve, a first clamping structure is arranged on the first sleeve, and a second clamping structure matched with the first clamping structure is arranged on the inner sleeve.
Furthermore, the first clamping structure is a first positioning hole, the second clamping structure is a first clamping protrusion, and the first clamping protrusion is clamped in the first positioning hole so that the outer sleeve is arranged on the first sleeve.
Further, the tip of first sleeve pipe is provided with first annular locating surface, is provided with the second annular locating surface with first annular locating surface looks adaptation on the inner skleeve, and first annular locating surface is used for laminating the location with second annular locating surface.
Furthermore, the outer sleeve is provided with a third clamping structure, and the cylindrical body is provided with a fourth clamping structure matched with the third clamping structure.
Further, third joint structure is the joint groove, and second joint structure is that the second joint is protruding, and the protruding card of second joint is established at the joint inslot so that the outer sleeve setting is on the cylindric body.
Further, the inner sleeve has an annular guide slope at an end of the inner sleeve to pass the cylindrical body out of the first opening by a guide action of the annular guide slope.
Further, the multi-stage completion apparatus further comprises: and the second sleeve is arranged at one end of the underground positioning structure far away from the main borehole hollow whipstock.
Use the technical scheme of the utility model, because interior bushing pipe is made by soluble metal material, like this, after the well cementation was accomplished, need not to take out the interior bushing pipe of soluble metal, only need utilize the drilling fluid directly to dissolve the interior bushing pipe of soluble metal, then go into milling tool communication main well, branch well again. Therefore, through the utility model provides a technical scheme can solve the complicated technical problem of operation of multistage branch completion device among the prior art.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 illustrates an assembly schematic of a multi-stage branch completion provided in accordance with an embodiment of the present invention;
fig. 2 shows a schematic structural view of a downhole positioning structure provided according to an embodiment of the present invention within a well;
fig. 3 illustrates a schematic structural view of a main wellbore hollow whipstock provided in accordance with an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a positioning suspension structure provided according to an embodiment of the present invention;
fig. 5 shows a schematic view of an installation structure of a soluble metal lined pipe in a positioning suspension structure provided according to an embodiment of the present invention;
FIG. 6 shows an enlarged view of a portion of the structure in the circle of FIG. 5;
fig. 7 shows a schematic structural diagram of multilateral well cementing provided according to an embodiment of the present invention;
fig. 8 shows a schematic diagram of a main well hole drilled by a grinding shoe after well cementation and plugged in the channel at the bottom of an aluminum bottom provided by the embodiment of the utility model.
Wherein the figures include the following reference numerals:
10. an underground positioning structure; 11. a first sleeve; 111. a first clamping structure; 112. a first annular locating surface; 113. a necking section; 114. aluminum bottom blocking; 12. a seal member; 20. a main wellbore hollow whipstock; 21. an inner sleeve; 211. an annular guide ramp; 22. an outer sleeve; 221. a first opening; 222. a second clamping structure; 223. a third clamping structure; 224. a second annular locating surface; 225. a third annular locating surface; 23. releasing the releasing gadget; 24. a plug; 30. positioning the suspension structure; 31. a cylindrical body; 311. a fourth clamping structure; 312. a fourth annular locating surface; 32. a liner tube; 321. a second opening; 322. the sleeve is connected with a thread; 33. second lowering releasing; 40. a connecting member; 50. a second sleeve; 60. grinding the shoe; 70. a well cementation pipe string; 81. a branch wellbore casing; 82. and (4) operating the pipe string.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 to 8, the embodiment of the present invention provides a multi-branch completion device, and specifically, the multi-branch completion device in this embodiment is mainly a 4-branch completion tool, and the 4-branch is a branch well in which both a main well and a branch well can be cased and cemented. The multi-stage branched well completion device comprises a downhole positioning structure 10 (the downhole positioning structure 10 can also be called a downhole permanent positioning tool), a main borehole hollow whipstock 20 and a positioning suspension structure 30 (the positioning suspension structure 30 can also be called a branched borehole pre-windowing positioning suspension tool), wherein the downhole positioning structure 10 can be permanently fixedly sleeved in a main casing downhole. The main borehole hollow whipstock 20 is arranged on the downhole positioning structure 10, the main borehole hollow whipstock 20 is located above the downhole positioning structure 10, the main borehole hollow whipstock 20 comprises an inner sleeve 21 and an outer sleeve 22, the inner sleeve 21 is arranged in the outer sleeve 22, the lower end of the inner sleeve 21 is inserted into the upper end of the downhole positioning structure 10, the upper end of the inner sleeve 21 is inserted into the outer sleeve 22, a first opening 221 is arranged on the side wall of the outer sleeve 22, and at least part of the inner sleeve 21 is located at the first opening 221. The positioning suspension structure 30 is arranged on the main borehole hollow core whipstock 20, the positioning suspension structure 30 can be bent, the positioning suspension structure 30 comprises a cylindrical body 31 and an inner lining pipe 32, the inner lining pipe 32 is arranged in the cylindrical body 31, a second opening 321 is arranged on the cylindrical body 31, the second opening 321 is arranged opposite to the first opening 221, at least part of the inner lining pipe 32 is arranged at the second opening 321, the inner lining pipe 32 can be fixed at the second opening 321 in a connection mode of expansion, clamping, connection of a connecting piece 40 and the like, and the first opening 221 and the second opening 321 can be blocked by the inner lining pipe 32. Wherein the liner tube 32 is made of a soluble metal material.
By adopting the multi-stage branch well completion device provided by the embodiment, after the well cementation is finished, the soluble metal lining pipe 32 does not need to be taken out, the soluble metal lining pipe 32 only needs to be directly dissolved by using the drilling fluid, then the milling tool is put in to communicate with the main well bore and the branch well bore, and then the milling tool is put in to communicate with the main well bore and the branch well bore, so that the operation efficiency and the reliability are improved. When the soluble metal lining pipe 32 is not completely dissolved, the soluble metal lining pipe 32 can be worn first by the next milling shoe 60, and the soluble metal lining pipe 32 is very easy to wear because of the low hardness of the metal. The cement in the tool core of the main wellbore hollow whipstock 20 and the aluminum bottom plug 114 in the downhole permanent setting tool are then worn through. Therefore, the multi-stage branch completion device provided by the embodiment can solve the technical problem of complex operation of the multi-stage branch completion device in the prior art.
In order to improve the setting stability of the liner tube 32, the soluble metal liner tube 32 may be directly expanded inside the cylindrical body 31 with the soluble metal liner tube 32 being located at the second opening 321; alternatively, the multi-stage branched completion apparatus of the present embodiment may further include a connection member 40, and the connection member 40 is connected to the cylindrical body 31 through the inner liner 32.
Specifically, the connecting member 40 is a connecting screw, and may be provided with a connecting through hole on the liner tube 32, and a threaded hole on the cylindrical body 31, and the connecting screw passes through the connecting through hole and is in threaded connection with the threaded hole. With this arrangement, the lining pipe 32 and the cylindrical body 31 can be stably connected together, and the stability of the arrangement of the lining pipe 32 can be further improved.
In this embodiment, the connection screws are made of a soluble material, which facilitates the separation of the liner tube 32 from the cylindrical body 31 after the completion of the cementing.
Specifically, the downhole positioning structure 10 in this embodiment includes a first sleeve 11, a first clamping structure 111 is disposed on the first sleeve 11, and a second clamping structure 222 adapted to the first clamping structure 111 is disposed on the inner sleeve 21. With this arrangement, it is convenient to connect the first sleeve 11 and the inner sleeve 21 so that the main wellbore hollow whipstock 20 is stably positioned on the downhole positioning structure 10.
Specifically, in the present embodiment, the first engaging structure 111 is an engaging hole, and the second engaging structure 222 is a first engaging protrusion, which is engaged with the engaging hole so that the outer sleeve 22 is disposed on the first sleeve 11. By adopting the clamping structure, the clamping is convenient and stable, and the operation is convenient for the workers.
In this embodiment, the end of the first sleeve 11 is provided with a first annular positioning surface 112, the inner sleeve 21 is provided with a second annular positioning surface 224 adapted to the first annular positioning surface 112, and the first annular positioning surface 112 is used for fitting and positioning with the second annular positioning surface 224. By adopting the structure, the stability of the arrangement of the first sleeve 11 and the outer sleeve 22 can be improved conveniently, the position deviation of the first sleeve 11 and the inner sleeve 21 in the use process is avoided, and the stability of the whole structure is improved. Specifically, in this embodiment, the first annular positioning surface 112 is axially disposed at the upper end of the first casing 11, the second annular positioning surface 224 is axially disposed at the outer lower portion of the inner sleeve 21, both the first annular positioning surface 112 and the second annular positioning surface 224 are inclined surfaces, when the installation is performed, the lower end of the inner sleeve 21 in the tool of the main wellbore hollow whipstock 20 is inserted into the upper end of the downhole permanent positioning tool, and the inner sleeve 21 and the downhole permanent positioning tool are connected and fixed by an elastic pin (the first engaging protrusion may be an elastic pin).
Specifically, the outer sleeve 22 in this embodiment is provided with a third locking structure 223, and the cylindrical body 31 is provided with a fourth locking structure 311 adapted to the third locking structure 223. With this arrangement, it is possible to facilitate the connection of the outer sleeve 22 and the cylindrical body 31 for the stable connection of the main wellbore hollow whipstock 20 with the positioning suspension structure 30.
Specifically, the third engaging structure 223 in this embodiment is an engaging groove, and the second engaging structure 222 is a second engaging protrusion, which is engaged in the engaging groove to allow the outer sleeve 22 to be disposed on the cylindrical body 31. Specifically, the clamping groove in this embodiment may be an open groove, and the second clamping protrusion slides in through the opening of the open groove to enable the second clamping protrusion to be clamped into the clamping groove, so as to improve the stability of clamping. By adopting the clamping structure, the clamping is convenient and stable, and the operation is convenient for the workers.
In this embodiment, the upper end of the outer sleeve 22 is circumferentially provided with a third annular positioning surface 225, the end of the cylindrical body 31 is provided with a fourth annular positioning surface 312 matched with the third annular positioning surface 225, and the third annular positioning surface 225 is used for being attached and positioned with the fourth annular positioning surface 312. By adopting the structure, the stability of the arrangement of the outer sleeve 22 and the cylindrical body 31 can be improved conveniently, the position deviation of the outer sleeve 22 and the cylindrical body 31 in the use process is avoided, and the stability of the whole structure is improved. Specifically, the third annular locating surface 225 and the fourth annular locating surface 312 may both be a beveled surface.
Specifically, the second opening 321 in the present embodiment is disposed on the sidewall of the cylindrical body 31, and the lower end of the second opening 321 is lower than the lower end of the annular guiding inclined surface 211, so that the lining pipes 32 at the second opening 321 all protrude from the first opening 221.
In the present embodiment, the inner sleeve 21 has an annular guide slope 211, and the annular guide slope 211 is located at the end of the inner sleeve 21 to allow the cylindrical body 31 to pass out of the first opening 221 by the guiding action of the annular guide slope 211. With such a configuration, it is possible to avoid the cylindrical body 31 from being entirely inserted into the outer sleeve 22 during the installation process, so that a portion of the cylindrical body 31 protrudes from the first opening 221 after being bent. Specifically, the annular guiding slope 211 is located at the first opening 221, and the annular guiding slope 211 is disposed toward the first opening 221 so as to better guide at least a portion of the cylindrical body 31 out of the first opening 221.
Specifically, the lower connection sleeve of the tool for setting and suspending a branch wellbore in advance is extended from the first opening 221 of the tool for setting and suspending a branch wellbore in advance in the main wellbore hollow whipstock 20, the upper part of the tool for setting and suspending a branch wellbore in advance is sleeved in the upper end of the outer sleeve 22, and the second opening 321 corresponds to the position of the annular guiding bevel 211. The outer diameter of the lower end of the branch hole pre-windowing positioning hanging tool in the embodiment is larger than the inner diameter of the annular guide inclined surface 211, so that the lower end of the branch hole pre-windowing positioning hanging tool is prevented from being inserted into the inner sleeve 21, and the annular guide inclined surface 211 can better play a role in guiding.
In this embodiment, the downhole permanent set tool further comprises a seal element 12, a neck section 113 and an aluminum bottom plug 114. The downhole permanent setting tool has a necked down section 113 with a seal 12 outside the necked down section 113. A downhole permanent positioning tool is provided within the second casing 50 as a positioning base for the lateral wellbore. The downhole permanent positioning tool is designed with a seal 12 that seals off the lower portion of the main wellbore from the lateral wellbore while setting. The downhole permanent positioning tool is provided with a locking hole (the locking hole is a clamping hole) connected with the main borehole reentry guiding tool.
The main wellbore core whipstock 20 tool of this embodiment further comprises a first drop release 23 and a plug 24. The branch borehole pre-windowing positioning suspension tool consists of a second lowering release 33 and casing connecting threads 322. The soluble metal lined pipe 32 is attached by a connector screw in the offset well bore pre-fenestration positioning hanger.
Specifically, the multi-stage completion assembly of the present embodiment further includes a second casing 50 and a lateral casing 81, wherein the second casing 50 is disposed at an end of the downhole positioning structure 10 away from the main wellbore hollow whipstock 20.
By adopting the 4-grade multilateral well completion device provided by the embodiment, the specific steps in use are as follows:
step 1, setting the underground permanent positioning tool to a set position of a main borehole, enabling the underground permanent positioning tool to be positioned at a set angle, carrying out expansion setting on the permanent positioning tool, hanging a lower removable whipstock on the underground permanent positioning tool after the permanent positioning tool is set, windowing a whipstock casing by a lower milling cone casing, drilling a sidetrack, and taking out the removable whipstock;
step 2, putting the tool of the main borehole hollow whipstock 20 into the main borehole, and correspondingly inserting the lower end of the tool of the main borehole hollow whipstock 20 into the upper end of the underground permanent positioning tool;
step 3, a branch well pre-windowing positioning suspension tool and a casing string connected with the branch well pre-windowing positioning suspension tool are put into the main well, so that the casing string at the lower end of the branch well reentry guiding tool extends out from the first opening 221 through the guiding of the annular guiding inclined plane 211 and corresponds to the position of the branch well, and the installation of the 4-level branch well completion tool is completed;
step 4, cementing a branch well, namely inserting a cementing pipe string 70 into the branch well, and performing subsequent operation on the branch well after cementing; during well cementation and subsequent operation, the drilling fluid reacts with the soluble metal lining pipe 32 in the branch borehole pre-windowing positioning suspension tool to dissolve the soluble metal lining pipe 32;
and 5, after the subsequent operations such as branch well cementing and the like of the branch well are finished, the next operation pipe string 82 with the grinding shoe 60 grinds through the cement in the inner core of the tool of the main well hollow-core whipstock 20 and the aluminum bottom plug 114 in the downhole permanent positioning tool, and the main well communication is finished.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: when the lateral well of the lateral well is cemented, lining pipe plugging cementing cement is arranged at the position of the pre-windowing positioning suspension tool of the lateral well, and can return to the upper part of the pre-windowing pipe group tool of the lateral well in the same way as conventional cementing, and the pre-windowing position is also used for normal cementing. After the well cementation is finished, a fishing tool is not needed to be put in to take out the soluble metal lining pipe, and the soluble metal lining pipe is dissolved in the drilling fluid automatically. Not only improves the well cementation quality, but also reduces the operation difficulty.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A multi-stage multilateral completion, comprising:
a downhole positioning structure (10);
a main wellbore air core whipstock (20) disposed on the downhole positioning structure (10), the main wellbore air core whipstock (20) comprising an inner sleeve (21) and an outer sleeve (22), the inner sleeve (21) disposed within the outer sleeve (22), a first opening (221) disposed in a sidewall of the outer sleeve (22), at least a portion of the inner sleeve (21) being located at the first opening (221);
the positioning suspension structure (30) is arranged on the main borehole hollow core whipstock (20), the positioning suspension structure (30) comprises a cylindrical body (31) and an inner lining pipe (32), the inner lining pipe (32) is arranged in the cylindrical body (31), a second opening (321) is arranged on the cylindrical body (31), the second opening (321) is arranged opposite to the first opening (221), and at least part of the inner lining pipe (32) is positioned at the second opening (321);
wherein the liner tube (32) is made of a soluble metal material.
2. The multi-stage completion branching device according to claim 1, further comprising a connector (40), wherein the connector (40) is connected with the cylindrical body (31) through the inner lining tube (32).
3. The multi-stage branched completion device according to claim 2, wherein the connector (40) is a connection screw, the liner tube (32) is provided with a connection through hole, the cylindrical body (31) is provided with a threaded hole, and the connection screw passes through the connection through hole and is in threaded connection with the threaded hole.
4. The multi-stage branched completion assembly of claim 3 wherein said attachment screw is made of a dissolvable material.
5. The multi-stage completion assembly according to claim 1, wherein the downhole positioning structure (10) comprises a first casing (11), the first casing (11) is provided with a first clamping structure (111), and the inner sleeve (21) is provided with a second clamping structure (222) adapted to the first clamping structure (111).
6. The multi-stage branch completion according to claim 5, wherein the first snap structure (111) is a first locating hole and the second snap structure (222) is a first snap projection, the first snap projection being snapped into the first locating hole to position the outer sleeve (22) on the first casing (11).
7. The multi-stage branch completion according to claim 5, wherein the end of the first casing (11) is provided with a first annular locating surface (112), and the inner sleeve (21) is provided with a second annular locating surface (224) adapted to the first annular locating surface (112), the first annular locating surface (112) being adapted to be positioned in abutment with the second annular locating surface (224).
8. The multi-stage branched completion system according to claim 5, wherein a third snap structure (223) is provided on the outer sleeve (22), and a fourth snap structure (311) adapted to the third snap structure (223) is provided on the cylindrical body (31).
9. The multi-stage completion assembly of claim 8, wherein the third snap-fit structure (223) is a snap-fit groove, and the second snap-fit structure (222) is a second snap-fit projection that snaps into the snap-fit groove to allow the outer sleeve (22) to be disposed on the tubular body (31).
10. The multi-stage completion assembly of claim 1, wherein the inner sleeve (21) has an annular guiding chamfer (212), the annular guiding chamfer (212) being located at an end of the inner sleeve (21) to guide the cylindrical body (31) out of the first opening (221) by the guiding action of the annular guiding chamfer (212).
11. The multi-stage completion branching device of claim 1 further comprising:
a second casing (50) disposed at an end of the downhole positioning structure (10) remote from the main wellbore hollow whipstock (20).
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