Packer for oil and gas well

Abstract

The utility model relates to the technical field of packers, in particular to a packer for an oil and gas well. The packer comprises a packer body, an upper connector, a lower connector, a motor, a push plate and a sand-proof filter screen, the sand-proof filter screen can filter out silt in petroleum, the push plate is driven by the motor, and the silt spreading around the sand-proof filter screen is further concentrated in the middle of the sand-proof filter screen. Sediment close to the edge can be prevented from falling into the packer body when the sand-proof filter screens in the upper connector and the lower connector are detached, the springs are fixed to the upper ends of the sand-proof filter screens, and workers can conveniently restore the positions of the sand-proof filter screens after detaching and cleaning the silt in the sand-proof filter screens. According to the packer for the oil and gas well, the sand prevention filter screen and the spring system are additionally arranged, the maintenance problem caused by sand blocking of underground equipment is solved, meanwhile, the recovery effect and adaptability of the packer body are enhanced through the expansion ring and the tension spring in the packing rubber pipe, deformation caused by too large hydraulic pressure is effectively prevented, and the service life of the packer body is prolonged. And the safety and the efficiency of underground operation are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of packers, and more specifically, to a packer for oil and gas wells. Background Art

[0002] During the exploitation process of oil and gas, the packer body, as an important downhole tool, is widely used in oil and gas wells to isolate different formation pressure intervals for operations such as layered testing, acid fracturing, etc. However, in practical applications, especially in an environment with sandy formations, the packer body is easily affected by downhole sand grains, resulting in impaired functionality. When a fluid containing a large amount of sand grains enters the packer body, these sand grains may clog key components of the packer body, such as seals, thereby affecting the normal operation of the packer body and even leading to failure. In addition, when the traditional packer body is disassembled and cleaned, it is difficult to completely remove the residual sand grains, especially those near the edge of the sand prevention filter screen. This not only increases the maintenance cost but also reduces the working efficiency of the equipment.

[0003] In addition, when the packer body is under high pressure, the inner rubber tube may deform, thus affecting its sealing performance. Although the existing packer bodies can address these problems to a certain extent, there are still certain limitations during long-term use, such as insufficient adaptability and poor restoration effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a packer for oil and gas wells to solve the problems that the existing packer body cannot effectively filter and remove sand grains and does not have adaptability and restoration effect.

[0005] To achieve the above purpose, a packer for oil and gas wells is provided, including a packer body, characterized in that: there is an upper joint at the upper end of the packer body, a lower joint at the lower end of the packer body, two motors are oppositely arranged on the outer wall of the upper joint, two connecting rods are oppositely inserted into the inner wall of the upper joint, the output end of the motor is inserted into the inner wall of the upper joint and fixedly connected with the connecting rod, and a push plate is fixedly connected to the other side of each connecting rod. The lower ends of the two push plates are in contact connection with a sand prevention filter screen.

[0006] As a further improvement of this technical solution, a spring is provided at the 90-degree rotation of the push plate centered on the center of the sand prevention filter screen. The lower end of the spring is fixedly connected to the upper end of the sand prevention filter screen, and the upper end of the spring is also fixedly connected to a fixing plate, and the fixing plate is fixedly connected to the inner wall of the upper joint.

[0007] As a further improvement of this technical solution, a first threaded pipe is fixedly connected to the lower end of the upper joint.

[0008] As a further improvement of this technical solution, the packer body includes a sealing rubber tube.

[0009] As a further improvement of this technical solution, an expansion ring is provided inside the packer rubber tube, and a tension spring is provided inside the expansion ring and is clamped at both ends of the inner wall of the expansion ring.

[0010] As a further improvement of this technical solution, a second threaded pipe is fixedly connected to the upper end of the lower joint.

[0011] As a further improvement of this technical solution, thread grooves are provided on both the upper surface and the lower surface of the packer rubber tube.

[0012] As a further improvement of this technical solution, a connecting pipe is fixedly connected to the upper end of the upper joint, and an oil pipe is fixedly connected to the upper end of the connecting pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. In this packer for oil and gas wells, by adding a sand prevention filter screen and a spring system, the sand in the oil can be effectively filtered out. The sand around the sand prevention filter screen is concentrated in the middle of the filter screen by driving the push plate with a motor. The advantage of this is that when the staff needs to disassemble and clean the sand prevention filter screen, it can prevent the sand at the edge from falling into the inside of the packer body. Then, by using the elastic function of the spring, the cleaned sand prevention filter screen can be returned to its original working position, reducing the cleaning difficulty and time, thereby improving the maintenance efficiency and reducing the maintenance cost.

[0015] 2. In this packer for oil and gas wells, an expansion ring and a tension spring are provided inside the packer rubber tube in the packer body, enhancing the restoration effect and adaptability of the packer body. In a high-pressure environment, the packer rubber tube may deform, but the tension spring inside the expansion ring can help the packer rubber tube return to its original shape when the pressure decreases, effectively preventing the permanent deformation of the packer body caused by excessive hydraulic pressure, ensuring the reliability of the packer body and the stability of long-term use, and improving the safety and efficiency of downhole operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall three-dimensional structure schematic diagram of the present utility model;

[0017] Figure 2 is the partial sectional structure schematic diagram of the upper joint of the present utility model;

[0018] Figure 3 is the overall bottom view structure schematic diagram of the present utility model;

[0019] Figure 4 is the partial sectional structure schematic diagram of the packer body of the present utility model;

[0020] The meanings of the various reference numerals in the figures are as follows:

[0021] Wherein: 1. oil pipe; 2. connecting pipe; 3. upper joint; 4. packer body; 5. lower joint; 6. first threaded pipe; 7. motor; 8. connecting rod; 9. push plate; 10. fixing plate; 11. spring; 12. anti-sand filter screen; 13. second threaded pipe; 14. threaded groove; 15. sealing rubber hose; 16. expansion ring; 17. tension spring. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0025] Please refer to Figures 1-4As shown in the figure, the purpose of this embodiment is to provide a packer for oil and gas wells, which includes a packer body 4, an upper joint 3, a lower joint 5, a motor 7, a connecting rod 8, a push plate 9, a fixing plate 10, a spring 11, a sand control filter screen 12, a first threaded pipe 6, a second threaded pipe 13, a packer rubber pipe 15, an expansion ring 16, a tension spring 17, a tubing 1 and a connecting pipe 2. An upper joint 3 is provided at the upper end of the packer body 4, and a lower joint 5 is provided at the lower end. Two motors 7 are oppositely provided on the outer wall of the upper joint 3, and two connecting rods 8 are oppositely inserted through the inner wall of the upper joint 3. The output end of the motor 7 is inserted into the inner wall of the upper joint 3 and fixedly connected to the connecting rod 8. The other sides of the connecting rods 8 are fixedly connected with push plates 9. The lower ends of the two push plates 9 are in contact connection with the sand control filter screen 12. Springs 11 are provided at the 90-degree rotation positions of the push plates 9 centered on the center of the sand control filter screen 12. The lower ends of the springs 11 are fixedly connected to the upper end of the sand control filter screen 12, and the upper ends of the springs 11 are also fixedly connected to the fixing plate 10. The fixing plate 10 is fixedly connected to the inner wall of the upper joint 3. A first threaded pipe 6 is fixedly connected to the lower end of the upper joint 3. The packer body 4 includes a packer rubber pipe 15. An expansion ring 16 is provided inside the packer rubber pipe 15. A tension spring 17 is provided inside the expansion ring 16 and is clamped at both ends of the inner wall of the expansion ring 16. A second threaded pipe 13 is fixedly connected to the upper end of the lower joint 5. Thread grooves 14 are provided on both the upper surface and the lower surface of the packer rubber pipe 15. A connecting pipe 2 is fixedly connected to the upper end of the upper joint 3. A tubing 1 is fixedly connected to the upper end of the connecting pipe 2. The motor 7 drives the connecting rod 8 to drive the push plate 9 to move, so that the sediment on the sand control filter screen 12 gathers towards the center for easy cleaning. The spring 11 ensures that the sand control filter screen 12 can return to its original position after cleaning. The expansion ring 16 and the tension spring 17 enhance the restoration effect and adaptability of the packer body 4, prevent the packer rubber pipe 15 from deforming due to excessive hydraulic pressure, and improve the safety and efficiency of downhole operations.

[0026] Among them, the sand control system is completed by the cooperation of multiple components. It includes a motor 7, a connecting rod 8, a push plate 9, a spring 11, a fixing plate 10 and a sand control filter screen 12. The motor 7 is fixed on the outer wall of the upper joint 3, and its output end is fixedly connected to the connecting rod 8. The connecting rod 8 passes through the inner wall of the upper joint 3 and is fixedly connected to the push plate 9. The push plate 9 is located above the sand control filter screen 12. When the motor 7 is started, it drives the connecting rod 8 and the push plate 9 to move, thereby pushing the sediment on the sand control filter screen 12 to gather towards the center of the filter screen. One end of the spring 11 is fixedly connected to the sand control filter screen 12, and the other end is fixedly connected to the inner wall of the upper joint 3 through the fixing plate 10. When the push plate 9 pushes the sediment, the spring 11 will be compressed, and after cleaning the sand control filter screen 12, the spring 11 will reset the sand control filter screen 12 to its original position for reuse.

[0027] The main function of the sand prevention system is to filter the sediment in the oil, prevent the sediment from entering the inside of the packer body 4 and causing blockage, and drive the push plate 9 through the motor 7 to concentrate the sediment on the sand prevention filter screen 12 in the middle, which is convenient for the staff to disassemble and clean the sand prevention filter screen 12, and prevent the sediment at the edge from falling into the packer body 4 during disassembly. In addition, the spring 11 ensures the accurate reset of the sand prevention filter screen 12 after disassembly and reinstallation, thus ensuring the normal operation of the system.

[0028] The sealing system consists of a sealing rubber tube 15, an expansion ring 16 and a tension spring 17. The sealing rubber tube 15 is one of the core components of the packer body 4 and is used to achieve sealed isolation of the pressures of different formations underground. An expansion ring 16 is provided inside the sealing rubber tube 15, and a tension spring 17 is provided inside the expansion ring 16. The tension spring 17 is clamped at both ends of the inner wall of the expansion ring 16. When the packer body 4 works underground, through hydraulic pressure or other external power sources, the sealing rubber tube 15 will expand, and the expansion ring 16 will expand accordingly to adapt to the size change of the wellbore. At this time, the tension spring 17 is in a compressed state, helping to maintain the shape of the expansion ring 16, so as to ensure that the sealing rubber tube 15 can effectively seal the wellbore and prevent the mutual penetration of formation fluids. When the external pressure decreases or is released, the elastic force of the tension spring 17 will help the expansion ring 16 and the sealing rubber tube 15 to return to their original shapes, so as to ensure that the packer body 4 can maintain good resilience even in a high-pressure environment, avoid permanent deformation caused by excessive expansion, and enhance the adaptability and reliability of the packer body 4.

[0029] Through the cooperation of the expansion ring 16 and the tension spring 17, the sealing system enhances the resilience effect and adaptability of the packer body 4, effectively prevents the deformation of the sealing rubber tube 15 caused by excessive hydraulic pressure, and improves the safety and efficiency of downhole operations.

[0030] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A packer for oil and gas wells, comprising a packer body (4), characterized in that: An upper joint (3) is provided at the upper end of the packer body (4), and a lower joint (5) is provided at the lower end of the packer body (4). Two motors (7) are oppositely provided on the outer wall of the upper joint (3), and two connecting rods (8) are oppositely inserted through the inner wall of the upper joint (3). The output end of the motor (7) is inserted through the inner wall of the upper joint (3) and is fixedly connected to the connecting rod (8). The other side of the connecting rod (8) is fixedly connected to a push plate (9), and the lower ends of the two push plates (9) are in contact with a sand-proof filter screen (12).

2. The packer for oil and gas wells according to claim 1, characterized in that: The push plate (9) is provided with a spring (11) at a position where it is rotated 90 degrees with the center of the circle of the sand-proof filter screen (12) as the center, the lower end of the spring (11) is fixedly connected to the upper end of the sand-proof filter screen (12), the upper end of the spring (11) is also fixedly connected to a fixing plate (10), and the fixing plate (10) is fixedly connected to the inner wall of the upper joint (3).

3. The packer for oil and gas wells according to claim 1, characterized in that: The lower end of the upper joint (3) is fixedly connected to a first threaded pipe (6).

4. The packer for oil and gas wells according to claim 1, characterized in that: The packer body (4) comprises a packer rubber tube (15).

5. The packer for oil and gas wells according to claim 4, characterized in that: An expansion ring (16) is provided inside the sealing rubber tube (15), and a tension spring (17) is provided inside the expansion ring (16) and is clamped at two ends of the inner wall of the expansion ring (16).

6. The packer for oil and gas wells according to claim 1, characterized in that: The upper end of the lower joint (5) is fixedly connected to a second threaded tube (13).

7. The packer for oil and gas wells according to claim 5, characterized in that: The upper surface and the lower surface of the sealing rubber tube (15) are both provided with thread grooves (14).

8. The packer for oil and gas wells according to claim 1, characterized in that: The upper end of the upper joint (3) is fixedly connected to a connecting pipe (2), and the upper end of the connecting pipe (2) is fixedly connected to an oil pipe (1).

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