Water shutoff packer for oil production in complex formation

Abstract

The utility model discloses a petroleum oil production water injection leakproof packer suitable for complex stratum, including packer body, the top of packer body is provided with the connecting pipe, the surface of connecting pipe is provided with the reinforcing sleeve, this petroleum oil production water injection leakproof packer suitable for complex stratum makes it pass through the thread hole of connecting plate and reinforcing sleeve in proper order through rotating screw rod, and finally is screwed into the lateral wall of drilling pipe column, thereby closely fixed connecting plate, reinforcing sleeve and drilling pipe column as a whole, and this structure is through mechanical linkage and multi -point locking mode, not only has strengthened the connection intensity between packer body and drilling pipe column, effectively prevented the loosening and falling apart of vibration during the process of going down the well, simultaneously formed the physical protection to the surface key part (such as rubber cylinder) of packer body with the help of the protection plate, avoided the scratch damage of well wall when lowering, significantly improved the installation reliability, structural stability and downhole operation safety of packer.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to a leak-proof packer for oilfield water injection in complex formations. Background Technology

[0002] A packer is a specialized tool installed on a downhole tubing string. It is mainly used to seal the annular space between the tubing and the oil and gas well casing, or between the tubing and the open hole wall, in order to achieve isolation between different formations and ensure inter-layer sealing and operational safety during oil and gas extraction.

[0003] Among existing technologies, such as the oil and gas extraction packer disclosed in Chinese Utility Model Patent (Announcement No.: CN218454726U), its structure includes a packer body with a channel for inserting a sucker rod on one side and a bidirectional lead screw embedded therein. By rotating the bidirectional lead screw, the first and second threaded blocks on it move in opposite directions, thereby pushing the telescopic mesh frame to expand or contract. The movement of the telescopic mesh frame is transmitted to the first and second connecting blocks, ultimately driving the limiting plate to clamp and fix the sucker rod, achieving a stable installation of the sucker rod in the pipeline. Simultaneously, the device is equipped with a first and second sealing ring, providing double sealing to the clamping area, effectively preventing leakage problems caused by improper clamping, and improving the reliability and sealing performance of the installation.

[0004] Existing packers generally use threaded connections to the drilling string. During the lowering process, due to the complex downhole environment, the tubing is susceptible to vibration and impact, which can lead to loosening of the threaded connection, affecting the packer's positioning stability and overall safety. Furthermore, most packers lack effective external protective structures. During lowering, their critical component—the rubber sleeve—is prone to direct friction or scraping against the wellbore, causing surface damage, deformation, or even rupture. This weakens its expansion and sealing capabilities, leading to a decrease in packing effectiveness and, in severe cases, potentially causing engineering accidents such as inter-layer flow. Utility Model Content

[0005] The purpose of this invention is to provide a leak-proof packer suitable for oilfield water injection in complex formations, so as to solve the problems mentioned in the background art.

[0006] A leak-proof packer for oilfield water injection in complex formations includes a packer body, a connecting pipe at the top of the packer body, a reinforcing sleeve on the surface of the connecting pipe, a drilling string connected to the top of the reinforcing sleeve, a locking unit inside the reinforcing sleeve for fixing the drilling string to the reinforcing sleeve, a connecting plate embedded on the surface of the reinforcing sleeve, a protective plate fixedly connected to the other end of the connecting plate, a limit block fixedly connected inside the protective plate, and the limit block being inserted into the surface of the packer body.

[0007] Preferably, the surface of the connecting pipe is fixedly connected with threads, and the connecting pipe is threadedly connected to the reinforcing sleeve.

[0008] Preferably, the locking unit includes: a threaded rod, which is threadedly connected to the reinforcing sleeve; the surface of the threaded rod is threadedly connected to the drilling string; and the surface of the threaded rod is threadedly connected to the connecting plate, so that the threaded rod passes through the interior of the connecting plate, the reinforcing sleeve, and the drilling string in sequence. A rotary knob is fixedly connected to one end of the threaded rod.

[0009] Preferably, the surface of the reinforcing sleeve has an inlay groove that matches the size of the connecting plate.

[0010] Preferably, the outer shell surface of the packer body is provided with a limiting groove that matches the size of the limiting block.

[0011] Preferably, a plurality of ball bearings are movably connected to the surface of the protective plate, and the ball bearings are arranged at equal intervals on the surface of the protective plate.

[0012] By adopting the above technical solutions, the connection between the reinforced packer body and the drilling string, as well as the protection of the reinforced packer body by the protective plate, have been achieved.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This leak-proof packer for oil production and water injection in complex formations, by rotating the threaded rod, allows it to pass through the threaded holes of the connecting plate and the reinforcing sleeve in sequence, and finally screw it into the side wall of the drilling string, thereby tightly fixing the connecting plate, the reinforcing sleeve and the drilling string into one unit. This structure, through mechanical linkage and multi-point locking, not only enhances the connection strength between the packer body and the drilling string, effectively preventing loosening and falling off due to vibration during the well run-in process, but also provides physical protection for key components (such as the rubber sleeve) on the surface of the packer body with the help of the protective plate, avoiding scratch damage to the well wall during the run-in process, significantly improving the installation reliability, structural stability and downhole operation safety of the packer. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partially enlarged structural schematic diagram of the present invention; Figure 4 This is an enlarged structural schematic diagram of the reinforcing sleeve of this utility model.

[0015] In the diagram: 1. Packer body; 2. Connecting pipe; 3. Reinforcing sleeve; 4. Embedding groove; 5. Connecting plate; 6. Limiting block; 61. Limiting groove; 7. Protective plate; 71. Ball bearing; 8. Threaded rod; 81. Threaded hole; 9. Rotary knob; 10. Drilling string. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-4 This utility model provides a technical solution: a leak-proof packer for oil production and water injection in complex formations, including a packer body 1, a connecting pipe 2 fixedly connected to the top of the packer body 1, the surface of the connecting pipe 2 being threaded, the connecting pipe 2 being threadedly connected to the reinforcing sleeve 3, a drilling string 10 being inserted into the top of the reinforcing sleeve 3, so that the drilling string 10 is connected to the connecting pipe 2 through the reinforcing sleeve 3, and a locking unit is provided inside the reinforcing sleeve 3, the locking unit being used to lock the drilling string 10 and the reinforcing sleeve 3 together; The locking unit consists of a threaded rod 8 and a rotary knob 9. The reinforcing sleeve 3 has a threaded hole 81 inside, which is threaded to the threaded rod 8. One end of the threaded rod 8 passes through the reinforcing sleeve 3 and is threaded to the drilling string 10. The other end of the threaded rod 8 is fixedly connected to the rotary knob 9, so that the operator can rotate the threaded rod 8 by rotating the rotary knob 9 to fix the drilling string 10 and the reinforcing sleeve 3 together. The surface of the reinforcing sleeve 3 has four cross-shaped inlay grooves 4. Each inlay groove 4 has a connecting plate 5 inlaid inside, and the connecting plate 5 is threadedly connected to the surface of the threaded rod 8. A protective plate 7 is fixedly installed on the other side of the connecting plate 5, and the protective plate 7 is attached to the outer shell surface of the packer body 1. Multiple limiting blocks 6 are fixedly installed on the inner side of the protective plate 7, so that the limiting blocks 6 are inserted into the limiting groove 61 opened in the outer shell of the packer body 1 to limit the position of the protective plate 7. Several ball bearings 71 are movably installed on the surface of the protective plate 7.

[0018] The working principle of this utility model is as follows: the packer body 1 is connected to the connecting pipe 2 and the reinforcing sleeve 3 through a threaded connection to achieve a stable connection between the connecting pipe and the reinforcing sleeve. Then, the drilling string 10 is inserted into the inner cavity of the reinforcing sleeve 3 to complete the initial positioning. Next, the connecting plate 5 is embedded into the inlay groove 4 on the outer wall of the reinforcing sleeve 3, and the connecting plate is pushed to bring the protective plate 7 on it to adhere to the surface of the packer body 1. At the same time, the protective plate 7 brings the limiting block 6 on it into the corresponding limiting groove 61 on the surface of the packer body, so as to achieve axial positioning and anti-rotation fixation, and ensure that the protective plate is firmly attached; Subsequently, the threaded rod 8 is rotated so that it passes through the threaded holes 81 of the connecting plate 5 and the reinforcing sleeve 3 in sequence, and is finally screwed into the side wall of the drilling string 10, thereby tightly fixing the connecting plate 5, the reinforcing sleeve 3 and the drilling string 10 into one unit. This structure, through mechanical linkage and multi-point locking, not only enhances the connection strength between the packer body 1 and the drilling string 10, effectively preventing loosening and detachment caused by vibration during the well run-in process, but also provides physical protection for key components such as the rubber sleeve on the surface of the packer body 1 with the help of the protective plate 7, preventing them from being scratched and damaged by the well wall during the run-in process. This significantly improves the installation reliability, structural stability and downhole operation safety of the packer.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

Claims

1. A leak-proof packer for water injection in oil production in complex formations, comprising a packer body (1), characterized in that: The packer body (1) is provided with a connecting pipe (2) at the top, and a reinforcing sleeve (3) is provided on the surface of the connecting pipe (2). The top of the reinforcing sleeve (3) is connected to a drilling string (10). A locking unit is provided inside the reinforcing sleeve (3). The locking unit is used to fix the drilling string (10) and the reinforcing sleeve (3) together. A connecting plate (5) is embedded on the surface of the reinforcing sleeve (3). A protective plate (7) is fixedly connected to the other end of the connecting plate (5). A limit block (6) is fixedly connected inside the protective plate (7), and the limit block (6) is inserted into the surface of the packer body (1).

2. The leak-proof packer for oilfield water injection in complex formations according to claim 1, characterized in that, The surface of the connecting pipe (2) is fixedly connected with threads, and the connecting pipe (2) is threadedly connected to the reinforcing sleeve (3) through the threads.

3. The leak-proof packer for oilfield water injection in complex formations according to claim 1, characterized in that, The locking unit includes: a threaded rod (8) threadedly connected to the reinforcing sleeve (3), the surface of the threaded rod (8) threadedly connected to the drilling string (10), and the surface of the threaded rod (8) threadedly connected to the connecting plate (5), so that the threaded rod (8) passes through the interior of the connecting plate (5), the reinforcing sleeve (3), and the drilling string (10) in sequence; and a rotary knob (9) fixedly connected to one end of the threaded rod (8).

4. The leak-proof packer for oilfield water injection in complex formations according to claim 1, characterized in that, The surface of the reinforcing sleeve (3) is provided with an inlay groove (4) that matches the size of the connecting plate (5).

5. The leak-proof packer for oilfield water injection in complex formations according to claim 1, characterized in that, The outer surface of the packer body (1) is provided with a limiting groove (61) that matches the size of the limiting block (6).

6. The leak-proof packer for oilfield water injection in complex formations according to claim 1, characterized in that, The protective plate (7) has several balls (71) movably connected to its surface, and the balls (71) are arranged at equal intervals on the surface of the protective plate (7).

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