Temporary plugging tool for open hole multilateral well
By designing a temporary plugging tool for open-hole branch wells and using the combined mechanism of a soluble valve core and a slotted valve core, the problem of mud and debris falling into the main wellbore during sidetracking operations of open-hole branch wells has been solved, and the formation of Effective protection and smoothness of the wellbore.
Patent Information
- Application Number
- CN202420964225.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-07
AI Technical Summary
During the side drilling operation of open-hole branch wells, mud and large particle debris are difficult to prevent falling into the main wellbore, resulting in formation pollution.
Design a temporary plugging tool for open-hole branch wells, including an upper joint, a body and a lower joint. It has a built-in soluble valve core and a slotted valve core. It uses a torsion spring and a reversing pin mechanism to ensure that mud and debris are blocked during sidetracking operations. It enters the main wellbore and automatically dissolves after the operation is completed, restoring the wellbore to unobstructed flow.
It effectively prevents mud and large debris from falling into the main wellbore, protects the formation from contamination, and at the same time ensures the wellbore is unobstructed during the production process to avoid affecting production due to sediment obstruction.
Smart Images
Figure CN222376452U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of petroleum downhole equipment, in particular to a temporary plugging tool for open-hole branch wells. Background Art
[0002] Branch well technology is an important means to solve the problems of fast decline of old wells, high oil production cost of old wells and contradiction of sea use. This technology adds new wells on the basis of old wells, increases the contact area between reservoir and wellbore, increases oil leakage area, improves recovery rate and increases production capacity of old wells; at the same time, it uses old wells to develop new wells, saves slots, effectively reduces the operation time of new well development and reduces operation costs. During the side drilling operation of open hole branch wells, mud and larger particles of debris will inevitably fall into the main wellbore and pollute the formation, so it is particularly important to develop a simple and practical temporary plugging tool. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a temporary plugging tool for an open hole branch well. The temporary plugging tool can effectively prevent mud and large particles of debris from falling into the main wellbore during the side drilling operation of the open hole branch well, thereby ensuring that the reservoir of the main wellbore is not polluted. The soluble valve core will not dissolve during the side drilling operation, ensuring that the mud and debris of the side drilling operation of the branch well will not fall into the main wellbore. When the side drilling operation of the branch well is completed, the soluble valve core dissolves, the main wellbore channel is unblocked, and the production of the main wellbore is not affected.
[0004] The utility model is realized by adopting the following technical solutions.
[0005] A temporary plugging tool for an open-hole branch well comprises an upper joint, a main body and a lower joint which are connected in sequence; an upper valve seat and a lower valve seat are respectively installed inside the main body and the lower joint, and the upper valve seat and the lower valve seat are respectively connected to the upper valve cover and the lower valve cover through a rotation pin, and a torsion spring is provided between the upper valve seat and the upper valve cover and between the lower valve seat and the lower valve cover; a soluble valve core is installed in the upper valve cover, and a slit valve core is installed in the lower valve cover.
[0006] Furthermore, the upper joint and the body, as well as the body and the lower joint are all connected by threads and fixed by anti-rotation screws.
[0007] Furthermore, the body is connected to the upper valve seat via threads, and an O-ring is provided between the body and the upper valve seat.
[0008] Furthermore, the lower joint is connected to the lower valve seat via threads, and an O-ring is provided between the lower joint and the lower valve seat.
[0009] Furthermore, an elastic retaining ring for a hole is installed above the soluble valve core.
[0010] Furthermore, an elastic retaining ring for a hole is installed above the slit valve core.
[0011] Furthermore, the slit valve core is provided with slits of uniform width in both the horizontal and vertical directions.
[0012] The utility model obtains the following beneficial effects.
[0013] (1) The soluble valve core of the utility model can prevent mud and large particles of debris from falling into the main wellbore within a certain time range, thereby ensuring that the main wellbore is not contaminated; (2) During the production operation, the upper and lower valve covers are opened under the action of the production pressure difference, the main wellbore is produced normally, and the soluble valve core gradually dissolves to prevent the upper end of the upper valve cover from being unable to open due to the deposition of a large amount of debris, thereby not affecting the production of the main wellbore; (3) The lower valve cover is equipped with a slit valve core to prevent large particles of debris from being deposited on the upper end of the lower valve cover after the soluble valve core is dissolved, so that the lower valve cover cannot be opened, thereby not affecting the production of the main wellbore. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model;
[0015] Figure 2 It is a structural schematic diagram of a slotted valve core of the utility model.
[0016] Among them: 1. Upper joint; 2. Anti-rotation screw; 3. O-ring; 4. Main body; 5. Upper valve cover; 6. Torsion spring; 7. Rotation pin; 8. Elastic retaining ring for hole; 9. Soluble valve core; 10. Upper valve seat; 11. Lower joint; 12. Lower valve cover; 13. Slit valve core; 14. Lower valve seat. DETAILED DESCRIPTION
[0017] The technical solution of the utility model will be clearly and completely described below through specific implementation methods.
[0018] like Figure 1-2 As shown, a temporary plugging tool for open hole branch wells is mainly used for temporary plugging of fallen objects (mud and rock cuttings) in the drilling operation of open hole branch wells, including an upper joint 1, an anti-rotation screw 2, an O-ring 3, a body 4, an upper valve cover 5, a torsion spring 6, a rotation pin 7, an elastic retaining ring for the hole 8, a soluble valve core 9, an upper valve seat 10, a lower joint 11, a lower valve cover 12, a slit valve core 13, and a lower valve seat 14.
[0019] The upper joint 1 and the lower joint 11 are connected to the body 4 through threads. The upper joint 1, the lower joint 11 and the body 4 are all provided with anti-rotation screw holes, and the anti-rotation screws 2 are embedded in the anti-rotation screw holes.
[0020] The body 4 is provided with a shoulder inside for placing an upper valve seat 10. The upper valve seat 10 is connected to the body 4 by threads, and an O-ring 3 is installed at the sealing part; the upper valve cover 5 is located at the upper end of the upper valve seat 10, and is connected to the upper valve seat 10 by a turn pin 7. A torsion spring 6 is provided between the upper valve cover 5 and the upper valve seat 10, and the torsion spring 6 ensures that the valve cover is in a closed state under free conditions. The soluble valve core 9 is located in the center of the upper valve cover 5, and an elastic retaining ring 8 for a hole is installed at the upper end of the soluble valve core 9 to limit the soluble valve core 9.
[0021] The lower joint 11 is also provided with a shoulder inside for placing the lower valve seat 14. The lower valve seat 14 is connected to the lower joint 11 by threads, and an O-ring 3 is installed at the sealing position; the lower valve cover 12 is located at the upper end of the lower valve seat 14, and is connected to the lower valve seat 14 by a turn pin 7. A torsion spring 6 is provided between the lower valve cover 12 and the lower valve seat 14, and the torsion spring 6 ensures that the valve cover is in a closed state under free conditions. The slit valve core 13 is located in the center of the lower valve cover 12, and a hole elastic retaining ring 8 is installed at the upper end of the slit valve core 13 for limiting the slit valve core 13.
[0022] Specifically, the upper end of the upper joint 1 is provided with a pin hole, the upper end is provided with an internal thread and a sealing groove, and the lower end is provided with an external thread and a sealing groove. The upper end of the body 4 is provided with an anti-rotation screw hole and an internal thread, the middle end is provided with a chamfer on the internal surface, the middle end is also provided with a shoulder and an internal thread, the lower end is provided with an external thread and a sealing groove, and the lower end is provided with a chamfer on the inner surface. The upper valve seat 10 is provided with a valve ear at the upper end, the valve ear is provided with a pin hole, the upper end inner surface is provided with a chamfered shoulder, the middle end is provided with a sealing groove, and the lower end is provided with an external thread. The upper valve cover 5 is provided with a valve ear, the valve ear is provided with a pin hole, the inner surface is provided with an elastic retaining ring hole, a sealing groove and a shoulder, and the lower end outer surface is provided with a chamfer. The soluble valve core 9 is provided with a chamfer on the outer surface and a seat at the lower end. The material is a soluble material, and the dissolution time can be adjusted according to the requirements of the on-site operation. The upper end of the lower joint 11 is provided with an anti-rotation screw hole on the outer surface, the upper end is provided with a thread, the middle end is provided with a shoulder, a chamfer and an internal thread, and the lower end is provided with an external thread and a sealing groove. The lower valve seat 14 has a valve ear at the upper end, a pin hole at the valve ear, a chamfered shoulder on the inner surface of the upper end, a sealing groove at the middle end, and an external thread at the lower end. The lower valve cover 12 has a valve ear, a pin hole at the valve ear, a retaining ring hole and a shoulder inside, and a chamfer on the outer surface of the lower end. The slit valve core 13 has a gap of uniform width in both the horizontal and vertical directions, a shoulder at the lower end, and a chamfer on the surface.
[0023] During the field operation, the utility model is located between the guide and the external packer, and is lowered into the well along with the sand control pipe string. The upper end of the upper joint 1 is connected to the drill pipe, the guide and the delivery tool, and the lower end of the lower joint 11 is connected to the external packer, the open hole anchor, the screen pipe, the ball seat and the guide shoe and other tools. When the tool is lowered, it is placed inside the service pipe string, so that the soluble valve core 9 and the slotted valve core 13 are both in the open state; during operation, the open hole anchor and the external packer are sealed by pressurizing the pipe, and then the service pipe string is lifted, and the two valve cores are closed under the action of the torsion spring 6, thereby ensuring that the mud and large particles of debris in the subsequent branch well side drilling operation do not fall into the main wellbore, preventing the main wellbore formation from being polluted. During the production operation, the upper and lower valve covers open under the action of the production pressure difference, the main wellbore produces normally, and the soluble valve core 9 gradually dissolves to prevent the upper end of the upper valve cover 5 from being unable to open due to a large amount of debris deposition; the lower valve cover 12 is installed with a slit valve core 13, even if large particles of debris are deposited on the upper end of the lower valve cover 12 after the soluble valve core 9 dissolves, making the lower valve cover 12 unable to open, it will not affect the production of the main wellbore.
[0024] The embodiments described above are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.
Claims
1. A temporary plugging tool for an open-hole branch well, characterized in that: The invention comprises an upper joint (1), a body (4) and a lower joint (11) which are connected in sequence; an upper valve seat (10) and a lower valve seat (14) are respectively installed inside the body (4) and the lower joint (11); the upper valve seat (10) and the lower valve seat (14) are respectively connected to the upper valve cover (5) and the lower valve cover (12) through a rotation pin (7); a torsion spring (6) is provided between the upper valve seat (10) and the upper valve cover (5) and between the lower valve seat (14) and the lower valve cover (12); a soluble valve core (9) is installed inside the upper valve cover (5), and a slit valve core (13) is installed inside the lower valve cover (12).
2. A temporary plugging tool for an open-hole branch well according to claim 1, characterized in that: The upper joint (1) and the body (4) as well as the body (4) and the lower joint (11) are all connected by threads and fixed by anti-rotation screws (2).
3. A temporary plugging tool for an open hole branch well according to claim 1, characterized in that: The body (4) and the upper valve seat (10) are connected via threads, and an O-type sealing ring (3) is provided between the body (4) and the upper valve seat (10).
4. A temporary plugging tool for an open hole branch well according to claim 1, characterized in that: The lower joint (11) is connected to the lower valve seat (14) via threads, and an O-type sealing ring (3) is provided between the lower joint (11) and the lower valve seat (14).
5. The temporary plugging tool for an open hole branch well according to claim 1, characterized in that: An elastic retaining ring (8) for a hole is installed above the soluble valve core (9).
6. A temporary plugging tool for an open hole branch well according to claim 1, characterized in that: An elastic retaining ring (8) for a hole is installed above the slit valve core (13).
7. A temporary plugging tool for an open-hole branch well according to claim 1, characterized in that: The slit valve core (13) is provided with slits of uniform width both horizontally and vertically.