High-pressure inner packing tie-back tool
By designing a high-pressure internal sealing retracting tool, the sealing and anchoring function under high pressure is achieved using the cooperation of the piston and the locking ring, the sealing and anchoring functions are solved, and the sealing failure and repair difficulties of traditional retracting tools under high pressure conditions is achieved, and efficient oil pipe repair and extending the life of the well pipe.
Patent Information
- Application Number
- CN202421793187.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-26
AI Technical Summary
Traditional recoiling tools are difficult to meet performance requirements under high pressure conditions, the sash is easily damaged, the seal fails, and the lack of effective repair technology, resulting in a long construction cycle and high cost on offshore well repair operations.
A high-pressure inner sealing and reconnecting tool is designed, including an upper joint, a housing, a piston, a sealing mechanism, a tile mechanism, an inner locking sleeve, an outer locking sleeve and a guide shoe. Through the cooperation of the piston and the locking ring, the sealing and anchoring functions under high pressure are achieved.
This tool can effectively seal and anchor the oil pipe under high pressure above 35MPa, solve the problem of perforation and leakage of oil pipes, avoid replacing the oil pipes, shorten the construction cycle, reduce costs, and extend the life of the oil water well.
Smart Images
Figure CN222848189U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of well repair, and in particular relates to a high-pressure internal isolation tie-back tool. Background Art
[0002] At present, the commonly used tool for offshore pipe string tie-back is the oil casing tie-back tube, which relies on the interference fit between the lip seal and the lead seal to achieve the sealing function. The tool is mainly composed of rubber, lead sealing components and spiral basket tiles. The sealing function is mainly achieved by the sealing packing, with a maximum pressure of 10Mpa, and the basket tile is used to achieve the locking and anchoring of the oil pipe or casing.
[0003] In the existing technology, with the emergence of high pressure and more complex working conditions of offshore natural gas, traditional tie-back tools are difficult to meet the performance requirements under high pressure conditions. Usually, the slips are easily damaged under high load pressure, affecting the anchoring function and failing to meet the bearing capacity requirements; excessive downhole pressure will cause seal failure. In the later stages of production, the oil pipe may also be corroded and perforated. At present, there is no effective repair technology and measures for high-pressure oil pipe perforation, and the problem can only be solved by replacing the pipe string through conventional operations. However, the offshore well repair operation has a long construction period and high cost, which puts higher functional requirements on the sealing technology of the tie-back tool. Utility Model Content
[0004] In order to solve all or part of the above problems, the utility model aims to provide a high-pressure internal isolation tie-back tool, which can be used for tie-back operations of high-pressure well pipe strings to solve the problem of sealing leaks caused by perforated oil pipes.
[0005] The present application provides a high-pressure internal isolation tieback tool, comprising an upper joint, a shell, a piston, a sealing mechanism, a slip mechanism, an inner locking sleeve, an outer locking sleeve, and a guide shoe, wherein the piston is arranged in the upper area of the shell, and the sealing mechanism is arranged in the lower area of the shell; one end of the inner locking sleeve is connected to the piston, and the other end is connected to the sealing mechanism; the outer peripheral wall of the inner locking sleeve is sleeved with an inner locking ring, and the inner locking sleeve and the inner locking ring are used to lock the sealing mechanism; the slip mechanism is arranged in the lower area of the shell, one end of the slip mechanism is connected to the sealing mechanism, and the other end is connected to the guide shoe; one end of the outer locking sleeve is connected to the slip mechanism, and the other end is connected to the inner locking sleeve through a shear pin, the outer peripheral wall of the outer locking sleeve is sleeved with an outer locking ring, and the outer locking sleeve and the outer locking ring are used to lock the slip mechanism; a sealing packing is arranged on the inner peripheral wall of the guide shoe.
[0006] In some embodiments, the shell includes an upper shell, a middle shell and a lower shell. The upper shell, the middle shell and the lower shell are coaxially and sealedly connected from top to bottom. The upper joint is sealedly connected to the upper shell. The piston is arranged in the upper shell, and the sealing mechanism and the cava mechanism are arranged in the lower shell.
[0007] In some embodiments, the inner locking ring is snap-fitted and fixed between the upper shell and the middle shell, and the outer locking ring is snap-fitted and fixed between the middle shell and the lower shell.
[0008] In some embodiments, a one-way thread structure is provided on the inner locking ring, and the inner locking sleeve forms a threaded connection with the one-way thread structure of the inner locking ring.
[0009] In some embodiments, a one-way thread structure is provided on the outer locking sleeve, and the outer locking ring and the one-way thread structure of the outer locking sleeve form a threaded connection.
[0010] In some embodiments, the sealing mechanism includes an upper pressure ring, a sealing rubber tube, a spacer ring, a sealing rubber tube and a lower pressure ring that are coaxial and connected in sequence, the inner locking ring is threadedly connected to the inner circumferential wall of the upper pressure ring, and the cava mechanism is threadedly connected to the outer circumferential wall of the lower pressure ring.
[0011] In some embodiments, an annular glue reducing groove is formed in the middle of the outer peripheral wall of the sealing rubber tube.
[0012] In some embodiments, the cava mechanism includes an upper cone, a lower cava sleeve, a cava, a lower cone and a positioning ring; the upper cone and the lower cone are arranged opposite to each other, the cava is arranged on the outer peripheral wall of the lower cava sleeve, one end of the lower cava sleeve is clamped with the upper cone, and the other end of the lower cava sleeve is clamped with the lower cone through the positioning ring, the upper cone is connected to the outer locking ring, and the lower cone is connected to the lower shell and the guide shoe.
[0013] In some embodiments, both ends of the slip are formed with inclined surfaces, which cooperate with the inner conical surfaces of the upper cone and the lower cone.
[0014] In some embodiments, tooth-like structures are arranged on the inner side of the slip at intervals in the axial direction.
[0015] It can be seen from the above technical solution that the high-pressure internal isolation tie-back tool 1 of the utility model can solve the problem of oil pipe perforation and leakage, does not require operation to replace the oil pipe, and has a short construction period and low operation cost, effectively extending the life of the oil and water wells. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of a high-pressure internal isolation tieback tool according to an embodiment of the utility model;
[0017] Figure 2 It is a structural schematic diagram of the connection between the high-pressure internal isolation tie-back tool and the inner pipe string in an embodiment of the utility model. DETAILED DESCRIPTION
[0018] In order to better understand the purpose, structure and function of the utility model, a high-pressure internal isolation tieback tool of the utility model is further described in detail below in conjunction with the accompanying drawings.
[0019] Figure 1 The structure of a high-pressure internal isolation tie-back tool 100 according to an embodiment of the utility model is shown. Figure 2 The schematic diagram of the high pressure internal isolation tie-back tool 100 and the inner pipe string according to the embodiment of the utility model is shown. Figure 1 and Figure 2 As shown, the high-pressure internal isolation tieback tool 100 includes an upper joint 1, a shell, a piston 3, a sealing mechanism, a slip mechanism, an inner locking sleeve 4, an outer locking sleeve 10, and a guide shoe 20, wherein the piston 3 is arranged in the upper area of the shell, and the sealing mechanism is arranged in the lower area of the shell; one end of the inner locking sleeve 4 is connected to the piston 3, and the other end is connected to the sealing mechanism; the outer peripheral wall of the inner locking sleeve 4 is sleeved with an inner locking ring 6, and the inner locking sleeve 4 and the inner locking ring 6 are used to lock the sealing mechanism; the slip mechanism is arranged in the lower area of the shell, one end of the slip mechanism is connected to the sealing mechanism, and the other end is connected to the guide shoe 20; one end of the outer locking sleeve 10 is connected to the slip mechanism, and the other end is connected to the inner locking sleeve 4 through a shear pin 9, the outer peripheral wall of the outer locking sleeve 10 is sleeved with an outer locking ring 8, and the outer locking sleeve 10 and the outer locking ring 8 are used to lock the slip mechanism; a sealing packing 21 is arranged on the inner peripheral wall of the guide shoe 20.
[0020] According to the high-pressure internal isolation tieback tool 100 of the embodiment of the utility model, when the inner pipe column enters the interior of the high-pressure internal isolation tieback tool 100 through the guide shoe 20, during the lowering process, the inner pipe column is straightened by the guide shoe 20, and the sealing packing 21 inside the guide shoe 20 is used for the early sealing of the inner pipe column. After the inner pipe column enters the interior of the high-pressure internal isolation tieback tool 100, it continues to be lowered, so that the top of the inner pipe column exceeds the upper end of the sealing mechanism and enters the interior of the inner locking sleeve 4. During operation, the pump is turned on to increase pressure, and pressure is generated in the upper part of the sealing packing 21. The pressure is slowly increased, and the pressure pushes the piston 3 to move downward. The piston 3 pushes the inner locking sleeve 4, the shear pin 9, and the outer locking sleeve 10 to drive the slip mechanism to move downward. The slip mechanism can clamp and fix the inner pipe column through its internal structure under the action of external force. Continue to pressurize, the shear pin 9 will shear, and after the pin is sheared, the outer locking sleeve 10 is fixed, and the inner locking sleeve 4 continues to move downward, pushing the sealing mechanism to close to the inner pipe column to produce a sealing effect. After the pressure is released, the inner locking ring 6 remains stationary to achieve a continuous sealing effect.
[0021] According to the high-pressure internal isolation tie-back tool 100 of the embodiment of the utility model, the sealing mechanism and the slip mechanism are combined to realize anchoring and sealing on the inner wall of the oil pipe, accurately seal the tie-back oil pipe, establish a new oil production channel to resume production, and realize the sealing of the casing or the inside of the oil pipe and the annular space at the same time, and can withstand a maximum high pressure of more than 35MPa. According to the high-pressure internal isolation tie-back tool 100 of the embodiment of the utility model, it can also solve the problem of oil pipe perforation and leakage, and does not require operation to replace the oil pipe, and has a short construction period and low operation cost, which effectively extends the life of the oil and water wells.
[0022] In the present application, the connection method of the guide shoe 20 is convenient for disassembly, and the suitable guide shoe 20 can be quickly replaced for inner pipe columns of different specifications.
[0023] Please continue to refer to Figure 1 In some embodiments, the shell may include an upper shell 2, a middle shell 5 and a lower shell 7. The upper shell 2, the middle shell 5 and the lower shell 7 are coaxially and sealedly connected from top to bottom. The upper joint 1 is sealedly connected to the upper shell 2, the piston 3 is arranged in the upper shell 2, and the sealing mechanism and the cava mechanism are arranged in the lower shell 7.
[0024] Through the above arrangement, on the one hand, the arrangement of the multi-section shell can facilitate the disassembly and assembly of the shell; on the other hand, the shell can also be used to protect the internal movement mechanism.
[0025] Please continue to refer to Figure 1 In some embodiments, the inner locking ring 6 is clamped and fixed between the upper shell 2 and the middle shell 5 , and the outer locking ring 8 is clamped and fixed between the middle shell 5 and the lower shell 7 .
[0026] In some embodiments, a one-way thread structure is provided on the inner locking ring 6 , and the inner locking sleeve 4 and the one-way thread structure of the inner locking ring 6 form a threaded connection.
[0027] In the present application, by providing a one-way thread structure, the one-way thread design on the inner locking ring 6 prevents the inner locking sleeve 4 from retreating after pressure relief, thereby enabling the sealing mechanism to play a continuous sealing role.
[0028] In some embodiments, a one-way thread structure is provided on the outer locking sleeve 10 , and the outer locking ring 8 is threadedly connected with the one-way thread structure of the outer locking sleeve 10 .
[0029] In the present application, a one-way thread structure is provided on the outer locking sleeve 10, which cooperates with the outer locking ring 8 to prevent the slip mechanism from loosening.
[0030] Please continue to refer to Figure 1 In some embodiments, the sealing mechanism may include an upper pressure ring 11, a sealing rubber tube 12, a spacer ring 13, a sealing rubber tube 12 and a lower pressure ring 14 that are coaxial and connected in sequence, the inner locking ring 6 is threadedly connected to the inner circumferential wall of the upper pressure ring 11, and the cava mechanism is threadedly connected to the outer circumferential wall of the lower pressure ring 14.
[0031] Please continue to refer to Figure 1 In some embodiments, an annular glue reducing groove is formed in the middle of the outer peripheral wall of the sealing rubber tube 12 .
[0032] Under the action of pressure, the inner locking ring 6 drives the upper pressure ring 11 to squeeze the sealing rubber sleeve, and the sealing rubber tube 12 is squeezed inwards to close to the inner pipe column to produce a sealing effect. After the pressure is relieved, the one-way thread structure on the inner locking ring 6 can prevent the inner locking sleeve 4 from retreating, thereby directly playing a continuous sealing role.
[0033] Please continue to refer to Figure 1 In some embodiments, the cava mechanism may include an upper cone 15, a lower cava sleeve 16, a cava 17, a lower cone 18 and a positioning ring 19; the upper cone 15 and the lower cone 18 are arranged opposite to each other, the cava 17 is arranged on the outer peripheral wall of the lower cava sleeve 16, one end of the lower cava sleeve 16 is clamped with the upper cone 15, and the other end of the lower cava sleeve 16 is clamped with the lower cone 18 through the positioning ring 19, the upper cone 15 is connected to the outer locking ring 8, and the lower cone 18 is connected to the lower shell 7 and the guide shoe 20.
[0034] Under the action of pressure, the outer locking ring 8 drives the upper cone 15 to move downward, and pushes the slips 17 inward with the unique locking mechanism on the lower cone 18 to fix the inner pipe column. The one-way thread structure designed on the outer locking sleeve 10 cooperates with the outer locking ring 8 to prevent the slips 17 from loosening.
[0035] Please continue to refer to Figure 1 In some embodiments, both ends of the slip 17 are formed with inclined surfaces, which cooperate with the inner conical surfaces of the upper cone 15 and the lower cone 18. In this unique locking mechanism, the inclined surfaces form a sliding fit with the inner conical surfaces of the upper cone 15 and the lower cone 18, so that the axial force is converted into a radial thrust on the slip 17, which further causes the slip 17 to contract inward and fix the inner pipe column.
[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.
[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0038] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.
[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A high pressure internal isolation tieback tool, characterized in that: It comprises an upper joint, a shell, a piston, a sealing mechanism, a slip mechanism, an inner locking sleeve, an outer locking sleeve and a guide shoe, wherein the piston is arranged in the upper area of the shell, and the sealing mechanism is arranged in the lower area of the shell; one end of the inner locking sleeve is connected to the piston, and the other end is connected to the sealing mechanism; the outer peripheral wall of the inner locking sleeve is provided with an inner locking ring, and the inner locking sleeve and the inner locking ring are used to lock the sealing mechanism; the slip mechanism is arranged in the lower area of the shell, one end of the slip mechanism is connected to the sealing mechanism, and the other end is connected to the guide shoe; one end of the outer locking sleeve is connected to the slip mechanism, and the other end is connected to the inner locking sleeve through a shear pin, the outer peripheral wall of the outer locking sleeve is provided with an outer locking ring, and the outer locking sleeve and the outer locking ring are used to lock the slip mechanism; a sealing packing is arranged on the inner peripheral wall of the guide shoe.
2. The high pressure internal isolation tieback tool according to claim 1, characterized in that: The shell includes an upper shell, a middle shell and a lower shell, and the upper shell, the middle shell and the lower shell are coaxially and sealedly connected from top to bottom. The upper joint is sealedly connected to the upper shell, the piston is arranged in the upper shell, and the sealing mechanism and the cava mechanism are arranged in the lower shell.
3. The high pressure internal isolation tieback tool according to claim 2, characterized in that: The inner locking ring is clamped and fixed between the upper shell and the middle shell, and the outer locking ring is clamped and fixed between the middle shell and the lower shell.
4. The high pressure internal isolation tieback tool according to claim 3, characterized in that: The inner locking ring is provided with a one-way thread structure, and the inner locking sleeve is threadedly connected with the one-way thread structure of the inner locking ring.
5. The high pressure internal isolation tieback tool according to claim 3, characterized in that: The outer locking sleeve is provided with a one-way thread structure, and the outer locking ring is threadedly connected with the one-way thread structure of the outer locking sleeve.
6. The high pressure internal isolation tieback tool according to any one of claims 1 to 5, characterized in that: The sealing mechanism includes an upper pressure ring, a sealing rubber tube, a spacer ring, a sealing rubber tube and a lower pressure ring which are coaxial and connected in sequence. The inner locking ring is threadedly connected to the inner peripheral wall of the upper pressure ring, and the slip mechanism is threadedly connected to the outer peripheral wall of the lower pressure ring.
7. The high pressure internal isolation tieback tool according to claim 6, characterized in that: An annular rubber reducing groove is formed in the middle of the outer peripheral wall of the sealing rubber tube.
8. The high pressure internal isolation tieback tool according to any one of claims 2 to 5, characterized in that: The cava mechanism includes an upper cone, a lower cava sleeve, a cava, a lower cone and a positioning ring; the upper cone and the lower cone are arranged opposite to each other, the cava is arranged on the outer peripheral wall of the lower cava sleeve, one end of the lower cava sleeve is clamped with the upper cone, and the other end of the lower cava sleeve is clamped with the lower cone through the positioning ring, the upper cone is connected to the outer locking ring, and the lower cone is connected to the lower shell and the guide shoe.
9. The high pressure internal isolation tieback tool according to claim 8, characterized in that: Both ends of the slip are formed with inclined surfaces, and the inclined surfaces are matched with the inner conical surfaces of the upper cone and the lower cone.
10. The high pressure internal isolation tieback tool according to claim 9, characterized in that: The inner side surface of the slip is provided with tooth structures arranged at intervals along the axial direction.