Novel test anti-abrasion centralizing blowout prevention plug

Abstract

The invention relates to the technical field of oil field water well testing, in particular to a novel testing anti-abrasion centralizing blowout prevention plug which comprises a lower centralizing pipe, a testing plug shell, two centralizing devices, an upper pressing cap and a pressing cover. The lower centralizing pipe and the centralizing device are used for limiting the steel wire of the testing instrument, so that the steel wire of the testing instrument can be effectively prevented from deviating, and abrasion and clamping stagnation in the running process of the steel wire are reduced; the centralizing device adopts the rolling ball design, traditional sliding friction is converted into rolling friction, the friction force and abrasion between the steel wire of the testing instrument and the blowout prevention plug are remarkably reduced, and the service life of the steel wire is prolonged; the sealing filler is arranged between the upper pressing cap and the test plug shell, so that the blowout prevention performance is enhanced, high-pressure fluid leakage is prevented, and the test safety is guaranteed; according to the novel test anti-abrasion centralizing blowout prevention plug, threaded connection and embedded design are adopted, disassembly and assembly are convenient, on-site maintenance and component replacement are convenient, and therefore the working efficiency and safety of a test instrument are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield water well testing, and particularly relates to a novel testing anti-abrasion centralizing blowout preventer. BACKGROUND

[0002] In the process of oilfield water well testing, the problem of wireline or cable abrasion is a long-standing issue. Since the wireline or cable directly contacts the central hole of the testing blowout preventer during the tripping process, the friction between the two can cause severe abrasion, which not only shortens the service life of the wireline or cable, but also affects the stability and accuracy of the testing instrument. Therefore, the wireline or cable needs to be replaced once a year, which not only increases the material cost, but also brings additional maintenance workload.

[0003] As the central hole of the testing blowout preventer gradually wears and becomes larger, high-pressure water in the well may be ejected from the blowout preventer, causing high-pressure water leakage. This leakage not only damages equipment, but also poses a threat to the safety of on-site workers. In order to prevent this from happening, new packing needs to be frequently replaced to maintain the sealing performance of the blowout preventer, which not only increases maintenance costs, but also makes equipment maintenance more cumbersome and affects work efficiency.

[0004] Under the prior art, the testing blowout preventer still has some limitations in design and application, including: 1. Lack of effective centralizing mechanism; 2. Curved wireline or cable produces local abrasion when passing through the hole of the blowout preventer due to friction with the edge of the hole, which not only increases the maintenance cost and workload of the equipment, but also may cause interruption of the testing work, affecting the continuity and efficiency of oilfield production. SUMMARY

[0005] (I) Technical problem to be solved The present application provides a novel testing anti-abrasion centralizing blowout preventer to overcome the problem of severe abrasion of the wireline and the blowout preventer during use, and the problem of high-pressure water being ejected from the central hole of the blowout preventer along the wireline channel during the testing process.

[0006] (II) Technical solution To achieve the above-mentioned purpose, the present application provides a novel testing anti-abrasion centralizing blowout preventer, comprising: a lower centralizing pipe, a testing blowout preventer shell, two centralizing devices, an upper pressure cap, and a gland; The centralizing device comprises a ball holder and a plurality of balls, the plurality of balls are evenly arranged in the ball holder, and the two centralizing devices comprise an upper centralizing device and a lower centralizing device. The lower centralizing pipe is in a hollow cylindrical structure, an annular step is arranged on the inner wall of the lower end of the lower centralizing pipe, and an external thread is arranged on the upper end of the lower centralizing pipe. The test plug housing is a hollow cylindrical structure. The inner wall of the lower end of the test plug housing is provided with an annular step. The lower end of the test plug housing is threadedly connected to the lower straightening tube. A lower straightening device is provided between the lower straightening tube and the test plug housing. The upper pressure cap is embedded in the upper end of the test plug shell, and a sealing filler is provided between the upper pressure cap and the test plug shell. The upper pressure cap is a hollow cylindrical structure, and a pressure cap is provided at the upper end of the upper pressure cap. An upper straightening device is provided between the upper pressure cap and the pressure cover.

[0007] Preferably, the sealing packing consists of two parts: the lower end of the sealing packing is cylindrical and the upper end is conical. The sealing packing has a through hole in the center and is used to block the high-pressure water flow from the well from being ejected.

[0008] Preferably, the ball frame is a hollow cylindrical structure with two partitions inside. The inner wall of the ball frame is evenly divided into three layers by the two partitions. The plurality of balls are evenly distributed in each layer of the ball frame, and the plurality of balls in each layer are tangent to each other. The center of the ball frame is provided with a through hole that matches the center of the sealing filler.

[0009] Preferably, the upper straightening device and the lower straightening device are arranged opposite to each other.

[0010] Preferably, the straightening device is filled with grease, which is used to fill the gap between the ball and the ball holder and to reduce the resistance between the ball and the ball holder.

[0011] Preferably, the upper end of the test plug housing is provided with an internal thread, the upper pressure cap is threadedly connected to the test plug housing, and the lower end of the upper pressure cap is provided with a conical structure that matches the upper end of the sealing filler.

[0012] Preferably, the inner wall of the upper end of the upper pressure cap is provided with an annular step, and the annular step provided on the inner wall of the upper pressure cap cooperates with the pressure cap to limit the upper straightening device provided in the upper pressure cap.

[0013] Preferably, the upper end of the upper pressure cap is provided with an external thread, the upper pressure cap is threadedly connected to the pressure cover, and the center of the pressure cover is provided with a through hole that matches the center of the ball frame.

[0014] Preferably, the inner wall dimension of the lower end of the lower straightening tube matches the outer diameter dimension of the test instrument rope cap, and the annular step provided on the inner wall of the lower end of the lower straightening tube is used to limit the test instrument rope cap.

[0015] Preferably, the ball is used to convert sliding friction into rolling friction, reducing friction when the steel wire passes through.

[0016] (III) Beneficial Effects The present application provides a new type of test anti-wear centralizing blowout preventer, which can effectively prevent the blowout preventer from deviating and wearing during use by setting a lower centralizing pipe and two centralizing devices, ensure that the test instrument wire remains in the center position, reduce the wear and jamming caused by eccentricity during movement; by the design of several rolling balls in the centralizing device, sliding friction is converted into rolling friction, which significantly reduces the friction and wear, prolongs the service life of the blowout preventer and the test wire; by setting a sealing packing between the upper pressing cap and the test plug shell, the blowout prevention performance is effectively enhanced, the leakage of high-pressure fluid in the well is prevented, and the safety of the test process is ensured; the threaded connection and embedded design between the components of the blowout preventer make the disassembly and assembly of the blowout preventer more convenient, facilitate the maintenance and replacement of parts on site, so as to achieve the purpose of improving the working efficiency and safety of the test instrument. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic diagram of a new type of test anti-wear centralizing blowout preventer is shown. Figure 2 A sectional view of a new type of test anti-wear centralizing blowout preventer is shown. Figure 3 A centralizing device schematic diagram of a new type of test anti-wear centralizing blowout preventer is shown. Figure 4 An upper pressing cap schematic diagram of a new type of test anti-wear centralizing blowout preventer is shown. Figure 5 A lower centralizing pipe schematic diagram of a new type of test anti-wear centralizing blowout preventer is shown.

[0018] 1: lower centralizing pipe; 2: test plug shell; 3: centralizing device; 4: rolling ball; 5: sealing packing; 6: upper pressing cap; 7: gland; 8: rolling ball holder. DETAILED DESCRIPTION

[0019] The present application will be described in detail below with reference to the drawings and examples, and the technical solutions in the examples of the present application will be clearly and completely described. Obviously, the described examples are only a part of the examples of the present application, not all examples. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0020] In the description of the present application, it is necessary to understand that the orientations or positional relationships indicated by "up", "down", "left", "right", "inner", "outer", "top", "bottom", etc. are all based on the orientations or positional relationships shown in the drawings, and the purpose is only to facilitate the description of the present application and simplify the description, and it does not indicate or imply that the components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] As shown in Figures 1-5 The present application provides a new type of test anti-wear centralizing blowout preventer, which comprises a lower centralizing pipe 1, a test plug shell 2, two centralizing devices 3, an upper pressure cap 6 and a gland 7. As shown in Figure 2 The centralizing device 3 comprises a ball roller 8 and a plurality of balls 4, the plurality of balls 4 are evenly arranged in the ball roller 8, and the two centralizing devices 3 comprise an upper centralizing device and a lower centralizing device, the upper centralizing device and the lower centralizing device are oppositely arranged. As shown in Figure 3 The ball roller 8 is a hollow cylindrical structure, two parallel partitions are arranged inside the ball roller 8, the two partitions evenly divide the inner cavity of the ball roller 8 into three layers of space, and a plurality of balls 4 of the same size and arranged in order are arranged in each layer of space, the balls 4 are tangent to each other, which can provide uniform support and rolling contact surface in all directions for the test wire, a through hole is arranged at the center of the ball roller 8, so that the test wire can pass through smoothly, and the multiple layers of the centralizing device 3 are arranged to have a plurality of support points inside to evenly distribute the load and reduce stress concentration. The centralizing device 3 is filled with lubricating grease, which is a semi-solid lubricating material, and the lubricating grease has high viscosity and good lubricating performance, the lubricating grease is filled in the small gaps between the balls 4 and the ball roller 8, by filling these gaps, the lubricating grease can form a smooth lubricating film, which can significantly reduce the frictional resistance between the balls 4 and the inner wall of the ball roller 8 and the test wire when rolling; When the test wire passes through the centralizing device 3, the wire will come into contact with the balls 4, due to the presence of the lubricating grease, the balls 4 can freely roll under low resistance, thereby converting the original sliding friction into rolling friction. This conversion greatly reduces the frictional force suffered by the wire during movement, thereby reducing the wear and energy loss of the wire, and the lubricating grease also has a sealing effect, which can prevent foreign matter from entering the inside of the ball roller 8, protect the cleanliness of the balls 4 and the ball roller 8, and prolong the service life of the device.

[0022] As shown in Figure 5As shown, the lower straightening tube 1 is a hollow cylindrical structure. The inner wall of the lower end of the lower straightening tube 1 is provided with an annular step. The inner wall size of the lower end of the lower straightening tube 1 matches the outer diameter of the rope cap of the testing instrument, which can ensure that the rope cap can be smoothly inserted into the lower end of the lower straightening tube 1. The annular step on the inner wall of the lower end of the lower straightening tube 1 is used to limit the rope cap of the testing instrument. The rope cap of the testing instrument can be directly inserted into the lower end of the lower straightening tube 1. The annular step on the inner wall of the lower end of the lower straightening tube 1 can effectively support and guide the steel wire, preventing it from bending and deforming under stress. The lower straightening tube 1 can not only protect the steel wire from damage, but also ensure that it can move smoothly during the test, improving the efficiency and accuracy of the entire testing instrument. The lower straightening tube 1 has an external thread at its upper end, which allows it to be threadedly connected to the test plug housing 2. The test plug housing 2 is a hollow cylindrical structure, and its internal space is used to accommodate various components and devices to ensure that the entire system remains stable and reliable during operation. The lower inner wall of the test plug housing 2 has an annular step. A lower straightening device is provided between the lower straightening tube 1 and the test plug housing 2. The annular step on the lower inner wall of the test plug housing 2 cooperates with the lower straightening tube 1 to position the lower straightening device. The lower straightening device is used to provide stable support and guidance to ensure that the test instrument wire passing through the blowout preventer maintains good concentricity and stability during operation. The upper pressure cap 6 is embedded in the upper end of the test plug shell 2, and a sealing filler 5 is provided between the two. The sealing filler 5 consists of two parts: the lower end is a cylindrical structure and the upper end is a conical structure with a through hole in the center. This allows the sealing filler 5 to not only fit tightly against the inner wall of the upper pressure cap 6 and the test plug shell 2, but also to effectively block the high-pressure water flow from the well and ensure the sealing performance of the system. like Figure 4 As shown, the upper pressure cap 6 is a hollow cylindrical structure with a pressure cap 7 at its upper end. An upper straightening device is provided between the upper pressure cap 6 and the pressure cap 7. The upper straightening device is used to provide stable support and guidance, ensuring that the testing instrument maintains good concentricity and stability during operation. The upper end of the test plug shell 2 is provided with an internal thread for threaded connection with the upper pressure cap 6. The lower end of the upper pressure cap 6 is provided with a conical structure that matches the upper end of the sealing packing 5. This ensures that the sealing packing 5 can tightly seal the gap between the test plug shell 2 and the upper pressure cap 6 when under pressure. The upper inner wall of the upper pressure cap 6 is provided with an annular step. This step cooperates with the pressure cap 7 to limit the upper straightening device inside the upper pressure cap 6, ensuring that it does not move axially during operation. The upper end of the pressure cap 6 is provided with external threads, allowing it to be threadedly connected to the pressure cap 7. The center of the pressure cap 7 is provided with a through hole that matches the center of the ball bearing 8, thus ensuring good coaxiality of the entire system during assembly and operation.

[0023] In the new type of test anti-abrasion centralizing blowout preventer, threaded connection and embedded design are adopted between each component, which makes the disassembly and assembly of the blowout preventer more convenient, greatly reducing the time and labor intensity of maintenance and replacement of parts. Threaded connection and embedded design also have good sealing performance and mechanical strength, threaded connection can ensure the close contact between each component, thereby providing good sealing effect, preventing fluid leakage and other safety hazards, and embedded design can increase the contact area between components, improve mechanical strength and tensile capacity, thereby ensuring the stability and reliability of the entire system.

[0024] The actual working scenario of the new type of test anti-abrasion centralizing blowout preventer will be introduced in detail below.

[0025] During actual work, the lower centralizing device is placed at the lower end of the test plug shell 2, the lower centralizing pipe 1 is connected to the test plug shell 2 through threads, the lower centralizing device is pressed and fixed, then the sealing filler 5 is placed on the upper end of the test plug shell 2, and it is pressed tightly through the upper pressing cap 6, the upper centralizing device is placed on the upper end of the upper pressing cap 6 and fixed through the threaded cover 7. Before the test instrument goes downhole, the steel wire connected to the test instrument is passed through the center of the blowout preventer, and the test instrument rope cap is inserted into the lower end of the lower centralizing pipe 1. During work, the lower centralizing device and the upper centralizing device provide stable support and guidance to the steel wire. When the high-pressure fluid in the well gushes upward, it exerts pressure on the sealing filler 5, which deforms under pressure to seal the gap between the test plug shell 2, the upper pressing cap 6 and the test instrument steel wire, preventing high-pressure fluid leakage. When the blowout preventer needs to be maintained or parts replaced, it can be quickly disassembled and assembled through threaded connection and embedded design, which is convenient for on-site maintenance and replacement of parts.

[0026] This device processes 20 sets, and after being applied on site, it reduces the cost of replacing steel wire or cable abrasion by 500,000 yuan per year, and reduces the number of times the test plug stings water outward from 5 times per well to 1 time per well. According to data, it is estimated that after large-scale assembly production in the work area, the employee work intensity can be reduced by 80%, and the work efficiency can be improved by 2-3 times.

[0027] It can be understood that the above-mentioned various embodiments of the present application can be combined with each other to form a combined embodiment without violating the principle logic. Due to the limited space, the present application will not be described again.

[0028] Those skilled in the art can understand that, in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process, and the specific execution order of each step should be determined according to its function and possible internal logic.

[0029] The novel test anti-abrasion centralizing blowout preventer provided by the application effectively prevents the blowout preventer from deviating and being abraded during use by arranging a lower centralizing pipe 1 and two centralizing devices 3, ensures that the test instrument wire is kept in a central position, reduces the abrasion and jamming caused by eccentricity during movement, and significantly reduces the friction and abrasion by converting sliding friction into rolling friction through the design of several rolling balls 4 in the centralizing device 3, prolongs the service life of the blowout preventer and the test wire, and effectively enhances the blowout prevention performance by arranging sealing packing 5 between the upper pressing cap 6 and the test blowout preventer shell 2, prevents high-pressure fluid leakage in the well, and ensures the safety of the test process; the components of the blowout preventer are connected by threads and embedded, so that the blowout preventer is more convenient to disassemble and assemble, and the components are convenient to maintain and replace on site, thereby achieving the purpose of improving the working efficiency and safety of the test instrument.

[0030] The above has described the embodiments of the application, the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application or technical improvement in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A new type of test anti-abrasion centralizer blowout preventer, characterized in that, The utility model relates to a testing plug shell, which comprises a lower centralizing pipe (1), a testing plug shell (2), two centralizing devices (3), an upper pressing cap (6) and a gland (7). The centralizing device (3) comprises a rolling ball frame (8) and a plurality of rolling balls (4), the plurality of rolling balls (4) are evenly arranged in the rolling ball frame (8), and the two centralizing devices (3) comprise an upper centralizing device and a lower centralizing device. The lower centralizing pipe (1) is in a hollow cylindrical structure, the inner wall of the lower end of the lower centralizing pipe (1) is provided with an annular step, and the upper end of the lower centralizing pipe (1) is provided with external threads. The testing plug shell (2) is in a hollow cylindrical structure, the inner wall of the lower end of the testing plug shell (2) is provided with an annular step, the lower end of the testing plug shell (2) is threadedly connected with the lower centralizing pipe (1), and a lower centralizing device is arranged between the lower centralizing pipe (1) and the testing plug shell (2). The upper pressing cap (6) is embedded in the upper end of the testing plug shell (2), a sealing packing (5) is arranged between the upper pressing cap (6) and the testing plug shell (2), the upper pressing cap (6) is in a hollow cylindrical structure, and the upper end of the upper pressing cap (6) is provided with the gland (7). An upper centralizing device is arranged between the upper pressing cap (6) and the gland (7). The sealing packing (5) is composed of two parts, the lower end of the sealing packing (5) is in a cylindrical structure, the upper end of the sealing packing (5) is in a conical structure, a through hole is arranged in the center of the sealing packing (5), and the sealing packing (5) is used for blocking the high-pressure water flow in the well from being sprayed out.

2. The new test anti-abrasion centralizer blowout preventer head according to claim 1, characterized in that, The rolling ball frame (8) is in a hollow cylindrical structure, two partitions are arranged in the rolling ball frame (8), the inner wall of the rolling ball frame (8) is evenly divided into three layers by the two partitions, the plurality of rolling balls (4) are evenly distributed in each layer of the rolling ball frame (8), the plurality of rolling balls (4) in each layer are tangent to each other, and a through hole that is matched with the center of the sealing packing (5) is arranged in the center of the rolling ball frame (8).

3. The new test anti-abrasion centralizer blowout preventer head of claim 2, wherein, The upper centralizing device and the lower centralizing device are arranged oppositely.

4. The new test anti-abrasion centralizer blowout preventer head of claim 1, wherein, Grease is filled in the centralizing device (3), the grease is used for filling the gaps between the rolling balls (4) and the rolling ball frame (8), and the grease is used for reducing the resistance between the rolling balls (4) and the rolling ball frame (8).

5. The new test anti-abrasion centralizer blowout preventer head of claim 3, wherein, The upper end of the testing plug shell (2) is provided with internal threads, the upper pressing cap (6) is threadedly connected with the testing plug shell (2), and the lower end of the upper pressing cap (6) is provided with a conical structure that is matched with the upper end of the sealing packing (5).

6. The new test anti-abrasion centralizer blowout preventer head of claim 2, wherein, An annular step is arranged on the inner wall of the upper end of the upper pressing cap (6), and the annular step arranged on the inner wall of the upper pressing cap (6) cooperates with the gland (7) to limit the upper centralizing device arranged in the upper pressing cap (6).

7. The new test anti-abrasion centralizer blowout preventer head of claim 1, wherein, The upper end of the upper pressing cap (6) is provided with external threads, the upper pressing cap (6) is threadedly connected with the gland (7), and a through hole that is matched with the center of the rolling ball frame (8) is arranged in the center of the gland (7).

8. The new test anti-abrasion centralizer blowout preventer of claim 3, wherein, The size of the inner wall of the lower end of the lower centralizing pipe (1) is matched with the outer diameter of a rope cap of a testing instrument, and the annular step arranged on the inner wall of the lower end of the lower centralizing pipe (1) is used for limiting the rope cap of the testing instrument.

9. The new test anti-abrasion centralizer blowout preventer head of claim 1, wherein, The rolling balls (4) are used for converting sliding friction into rolling friction and reducing friction when a steel wire passes.

10. The new test anti-abrasion centralizer blowout preventer head of claim 1, wherein, ​

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