Impact oil drain

Abstract

The utility model discloses an impact type oil drain, including the installation cavity of setting in the oil drain valve body's column core, the first clamping groove and second clamping groove are equipped with on the installation cavity inner wall interval, and the snap spring of being positioned between the first clamping groove and second clamping groove is equipped on the column core, and the sealing element of sealing contact with the installation cavity inner wall is equipped on the entity part of column core one end, when the snap spring is switched to the second clamping groove by the column core drive first clamping groove, drive sealing ring to remove from the installation cavity, make installation cavity, drain cavity and connecting mouth intercommunication, adopt this technical scheme, through the design multiple sealing elements on the column core can realize multiple sealing redundancy, improve the sealing reliability, and the sealing state change of sealing element is realized through the axial movement of column core, and this process is accurate, controllable, reliable, and the adaptability to well condition is stronger, and the sealing structure of this impact type oil drain is simple, and the installation maintenance is convenient, and the processing and manufacturing difficulty and production cost are reduced greatly.

Description

Technical Field

[0001] This utility model relates to the field of downhole anchoring tools, specifically to an impact-type oil drainer. Background Technology

[0002] In oilfield well workover operations, the impact-type blowout preventer (BOP) is a crucial downhole tool. The BOP is installed in the pump string and connected to the tubing. Its core function is to seal the tubing cavity when the tubing and sucker rod string are lowered to prevent high-pressure oil and gas from being ejected from the well, ensuring operational safety. At the same time, it can open the tubing cavity during pump start-up to relieve tubing pressure and facilitate construction.

[0003] Currently, a typical example in this technical field is a self-detaching blowout preventer (BOP) drain switch disclosed in Chinese patent document CN205297473U. Its structure includes a drain valve body, a drain valve, a sealing sleeve, and a BOP assembly. Specifically, the BOP assembly is located below the sealing sleeve and is composed of a connecting screw and six 60-degree arc-shaped plates bonded together, forming a BOP cap that can be dislodged upon impact. Its working principle is: after the pump is lowered, the plunger of the pump impacts the assembly, causing the bonded arc-shaped plates to detach, thereby opening the oil inlet channel. From the above structure, it can be seen that the existing BOP assembly is assembled from multiple parts using adhesives. These adhesives are prone to failure due to aging, temperature changes, or fluid corrosion, resulting in poor structural stability. This leads to the BOP cap prematurely detaching under unexpected circumstances (during the lowering of the tubing string), causing serious well control safety risks. This assembly requires extremely high precision in parts processing and bonding technology, increasing manufacturing costs and the difficulty of quality control. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the blowout preventer valve plate assembly of the existing blowout preventer requires extremely high precision in the machining and bonding process of the parts, which increases the manufacturing cost and the difficulty of quality control, and results in poor structural stability.

[0005] To solve the above-mentioned technical problems, this utility model provides an impact-type oil drainer, comprising: The drain valve body has an installation cavity and a connection port at one end of the installation cavity for connecting an oil pipe. A core is disposed in the mounting cavity of the drain valve body, and has an oil inlet cavity; a positioning structure is provided between the core and the drain valve body to keep their relative positions fixed. The positioning structure includes a first slot and a second slot spaced apart on the inner wall of the mounting cavity, and a retaining spring sleeved on the core for switching positioning between the first slot and the second slot. A sealing structure includes a solid portion disposed at one end of the core and at least one sealing element disposed on the solid portion. When the core drives the retaining spring to be positioned in the first retaining groove, the sealing element contacts the inner wall of the mounting cavity to form a sealing fit. When the core is driven by an external force to move and position the retaining spring in the second retaining groove, the sealing element moves with the solid portion and is exposed in the mounting cavity, so that the mounting cavity and the oil inlet cavity are connected to the connection port.

[0006] As a preferred embodiment, the mounting cavity is a cylindrical cavity extending axially along the drain valve body, comprising a first cavity and a second cavity with different diameters. The solid part is fitted into the second cavity, thereby causing the sealing element to fit tightly into contact with the inner wall of the second cavity.

[0007] As a preferred embodiment, at least one annular sealing groove is provided on the outer peripheral sidewall of the solid part, and the sealing element is a sealing ring embedded in the annular sealing groove.

[0008] As a preferred embodiment, the core includes a push-receiving part, an oil draining part, and a solid part connected sequentially along the axial direction. The oil inlet chamber is a columnar cavity extending along the axial direction of the core and disposed in the push-receiving part and the oil draining part. One end of the oil inlet chamber is blocked by the solid part, and the other end is an open end disposed in the push-receiving part. The oil draining part is slidably connected in the first cavity and the second cavity. A radial window hole communicating with the oil inlet chamber is provided on the side wall of the oil draining part.

[0009] As a preferred embodiment, the first slot and the second slot are arranged axially on the inner wall of the second cavity, and the first slot is provided with a guide slope.

[0010] As a preferred embodiment, the side wall of the pushed portion is provided with a retaining ring groove for installing the retaining ring, and the end of the pushed portion is provided with a flared opening that communicates with the oil inlet chamber.

[0011] As a preferred embodiment, a first limiting step is formed between the first cavity and the second cavity, and a second limiting step is provided between the pushed part and the oil draining part, which is opposite to the first limiting adjustment.

[0012] As a preferred embodiment, the radial window is an elongated hole extending axially along the core and disposed on the side wall of the oil drain section, and multiple holes are evenly distributed circumferentially.

[0013] As a preferred embodiment, the side wall of the drain valve body is provided with a drain hole that connects to the mounting cavity, and the drain hole is provided with a drain pin, which extends through the radial window hole into the oil inlet cavity.

[0014] As a preferred embodiment, the connection port is a tapered interface with a diameter that gradually decreases from the outside to the inside, and its inner wall is provided with a threaded structure.

[0015] Compared with the prior art, the technical solution of this utility model has the following advantages: 1. In the impact-type oil drain provided by this utility model, the solid part is an integrated structure of the column core, which can provide a flat and stable installation reference and rigid support for the sealing element. It can ensure that the contact area between the sealing element and the inner wall is uniform and the contact pressure is stable, and will not generate sealing gaps due to carrier shaking. In order to prevent the leakage and ejection of oil and gas in the tubing during oil well operations, the oil drain is installed in the blowout prevention state. The column core drives the retaining spring to be positioned in the first retaining groove. At this time, the sealing element is in a sealed contact state with the inner wall of the installation cavity, thereby isolating the oil inlet chamber of the column core from the tubing; and when the oil drain switches from the sealed state to the unsealed state, the column core is pushed by external force to move the retaining spring to the second The seal is positioned in the slot and moves out of the mounting cavity. At this time, the seal is completely separated from the inner wall of the mounting cavity, thus connecting the oil inlet cavity with the oil pipe. The advantage of this technical solution is that multiple seals can be designed on the core to achieve multiple sealing redundancy, improving sealing reliability. The sealing state of the seal is changed by the axial movement of the core, and the precise positioning is achieved by the cooperation of the snap ring with the first and second snap slots. This process is accurate, controllable, and reliable, and has stronger adaptability to well conditions. The sealing structure of this impact-type oil drainer is simple, easy to install and maintain, easy to mass-produce and control quality, and greatly reduces the processing and manufacturing difficulty and production cost.

[0016] 2. In the impact-type oil drain provided by this utility model, the core is divided into a push-receiving part, an oil draining part, and a solid part along the axial direction. An oil inlet chamber is provided through the push-receiving part and the oil draining part along the axis. One end of the oil inlet chamber is sealed by the solid part, and the other end is provided with a flared opening. The push-receiving part is driven by external force to realize the axial movement of the core. The oil draining part controls the oil draining channel. The solid part carries the sealing element to realize the sealed connection between the core and the oil drain valve body. The overall structure is simple and the processing accuracy is easy to control, ensuring that the fluid flow resistance in the cavity is small and the flow efficiency is high. By providing a radial window hole on the side wall of the oil draining part to connect the oil inlet chamber, when the oil drain switches from the sealed anti-spray state to the oil draining state, the movement of the core makes the radial window hole part exposed outside the installation cavity, which can quickly connect the oil inlet chamber with the connection port and oil pipe, ensuring the timeliness and smoothness of oil draining. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a cross-sectional structural diagram of the impact-type oil drain of this utility model. Figure 2 This is a schematic diagram of the structure of the oil drain pin of this utility model installed on the oil drain valve body; Figure 3 This is a schematic diagram of the planar structure of the core of this utility model; Figure 4 This is a cross-sectional structural diagram of the core of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Drain valve body; 11. First cavity; 12. Second cavity; 13. Connection port; 14. First limiting step; 2. Core; 21. Solid part; 22. Drain part; 23. Push part; 24. Oil inlet cavity; 25. Radial window; 26. Annular sealing groove; 27. Trumpet opening; 28. Second limiting step; 3. Seal; 4. First groove; 5. Second groove; 6. Snap ring; 7. Drain hole; 8. Drain pin. Detailed Implementation

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example The following is a detailed description of this embodiment with reference to the accompanying drawings: This embodiment provides, as follows: Figure 1-4 An impact-type oil drain device is shown, comprising: The drain valve body 1 has an installation cavity and a connection port 13 connected to one end of the installation cavity for connecting an oil pipe. The column core 2 is disposed in the mounting cavity of the oil drain valve body 1, and has an oil inlet cavity 24; a positioning structure is provided between the column core 2 and the oil drain valve body 1 to keep their relative positions fixed. The positioning structure includes a first slot 4 and a second slot 5 spaced apart on the inner wall of the mounting cavity, and a retaining spring 6 sleeved on the column core 2 for switching positioning between the first slot 4 and the second slot 5. The sealing structure includes a solid portion 21 at one end of the core 2 and at least one sealing element 3 on the solid portion 21. When the core 2 drives the retaining spring 6 to be positioned in the first retaining groove 4, the sealing element 3 contacts the inner wall of the mounting cavity to form a sealing fit. When the core 2 is driven by an external force to move and position the retaining spring 6 in the second retaining groove 5, the sealing element moves out of the mounting cavity along with the solid portion 21, so that the mounting cavity and the oil inlet cavity 24 are connected to the oil pipe through the connection port 13.

[0024] The above-described implementation method is the core technical solution of this embodiment. Since the solid part 21 is an integrated structure of the core 2, it provides a flat and stable installation reference and rigid support for the sealing element 3. This ensures that the contact area between the sealing element 3 and the inner wall is uniform and the contact pressure is stable, preventing sealing gaps due to carrier shaking. To prevent oil and gas leakage and ejection from the tubing during oil well operations, the oil drainer needs to be installed in a sealed state. The core 2 drives the retaining spring 6 to be positioned in the first retaining groove 4. At this time, the sealing element 3 is in sealed contact with the inner wall of the installation cavity, thereby isolating the oil inlet chamber of the core 2 from the tubing. Furthermore, when the oil drainer switches from a sealed state to an unsealed state, the core 2 is pushed by external force, causing the retaining spring 6 to move. The seal 3 is moved to the second slot 5 for positioning and moves out of the installation cavity. At this time, the seal 3 is completely separated from the inner wall of the installation cavity, so that the oil inlet cavity 24 is connected to the oil pipe. The advantage of this technical solution is that multiple sealing redundancies can be achieved by setting multiple seals 3 on the core 2, which improves the sealing reliability. The sealing state of the seal 3 is changed by the axial movement of the core, and the precise positioning is achieved by the cooperation of the snap ring with the first and second slots. This process is accurate, controllable and reliable, and has stronger adaptability to well conditions. The sealing structure of this impact-type oil drainer is simple, easy to install and maintain, easy to mass produce and control quality, and greatly reduces the processing and manufacturing difficulty and production cost.

[0025] In a further preferred embodiment, the mounting cavity is a cylindrical cavity extending axially along the drain valve body 1, comprising a first cavity 11 and a second cavity 12 with different diameters. The first slot 4 and the second slot 5 are spaced apart along the axial direction of the mounting cavity on the inner wall of the second cavity 12. The first slot 4 is provided with a guide slope, which provides a smooth transition for the radial contraction of the retaining spring 6, greatly reducing the axial force required to push the retaining spring 6 out of the first slot 4, making the operation more effortless and smoother. In a further preferred embodiment, the solid part 21 is fitted into the second cavity 12 and drives the sealing element 3. The first cavity 11, which is in close contact with the inner wall of the second cavity 12, can serve as the positioning and moving area for the core 2 and the retaining spring 6. The second cavity 12 serves as the sealing connection area for the core 2 and the sealing element 3. Specifically, two annular sealing grooves 26 are provided on the outer peripheral sidewall of the solid part 21. The sealing element 3 is a sealing ring embedded in the annular sealing groove 26. The sealing ring is made of elastic rubber material and two are provided on the solid part 21 of the core 2. The two sealing rings form two independent sealing barriers along the axial direction between the core 2 and the first cavity 11, achieving double sealing and significantly improving sealing reliability and safety.

[0026] The following is combined with Figure 1 , Figure 3-4 A detailed explanation of the core structure is provided below: The core 2 includes a push-receiving part 23, an oil draining part 22, and a solid part 21 connected sequentially along the axial direction. The oil inlet chamber 24 is a cylindrical cavity that extends through the push-receiving part 23 and the oil draining part 22 along the axial direction of the core 2. One end of the oil inlet chamber 24 is blocked by the solid part 21, and the other end is an open end provided in the push-receiving part 23. The oil draining part 22 is slidably connected in the first cavity 11 and the second cavity 12. The side wall of the push-receiving part 23 is provided with a snap ring groove for installing the snap ring 6. The end of the push-receiving part 23 is provided with... The oil inlet chamber 24 has a flared opening 27, which is the opening end of the oil inlet chamber 24. The side wall of the oil drain section 22 has a radial window 25 communicating with the oil inlet chamber 24. A first limiting step 14 is formed between the first cavity 11 and the second cavity 12. A second limiting step 28, which is opposite to the first limiting adjustment, is provided between the push-receiving part 23 and the oil drain section 22. The movement stroke of the core 2 can be limited by the abutting cooperation of the first limiting step 14 and the second limiting step 28. When the core 2 drives the retaining spring 6 to be positioned in the first retaining groove 4, part of the push-receiving part 23 is exposed on the other side of the mounting cavity, and the solid part 21 is in sealed contact with the second cavity 12 through the sealing ring. At this time, the oil drainer is in a sealed state. When the core 2 drives the retaining spring 6 to move and be positioned in the second retaining groove 5, the sealing ring is disengaged from the second cavity 12. At this time, the oil drainer is in an unsealed state. This structural design divides the core 2 axially into a push-receiving part 23, an oil draining part 22, and a solid part 21. An oil inlet chamber 24 is provided axially between the push-receiving part 23 and the oil draining part 22. The push-receiving part 23 is driven by external force to achieve axial movement of the core. The oil draining part 22 integrates the oil inlet chamber and a radial window. The solid part 21 carries the sealing element 3 to achieve a sealed connection between the core and the drain valve body. The overall structure is simple and the machining accuracy is easy to control, ensuring low flow resistance and high flow efficiency of the fluid in the cavity. By providing a radial window 25 on the side wall of the oil draining part 22 to connect to the oil inlet chamber 24, when the drain valve switches from the sealed state to the unsealed state, the core is pushed by external force to move axially, causing the sealing ring to disengage from the installation cavity. At the same time, the movement of the core exposes the radial window part outside the installation cavity, which can quickly connect the oil inlet chamber to the connection port and the oil pipe, ensuring the reliability and smoothness of downhole oil pumping operations.

[0027] like Figure 1 As shown, the connection port 13 is a tapered interface with a diameter that gradually decreases from the outside to the inside. Its inner wall is provided with a threaded structure, and the oil pipe is fastened to the connection port 13 through the threaded structure. This tapered structure design of the connection port plays a precise guiding role in the insertion of the oil pipe. The mechanical engagement of the thread can provide a strong axial fastening force. Under complex working conditions such as downhole vibration and pressure fluctuation, it can effectively prevent the oil pipe and the drain valve from loosening relative to each other and enhance the connection strength.

[0028] In a further optimized configuration, during well workover operations, it is necessary to drain the fluid from the tubing to ensure that the fluid is drained into the well when the tubing is pulled out, thus preventing crude oil from spilling onto the surface and polluting the environment. Therefore, the side wall of the drain valve body 1 is provided with a drain hole 7 connecting to the installation cavity. The drain hole is equipped with a drain pin 8, which extends through a radial window 25 into the inlet cavity 24. The radial window 25 is an elongated hole extending axially along the core 2 and located on the side wall of the drain section 22, with multiple holes evenly distributed circumferentially. This design effectively accommodates the movement of the core 2. When the core 2 moves axially within the installation cavity, the drain pin 8 can slide relative to the core 2 within the elongated hole, preventing... The drain pin 8, which prevents the normal displacement of the core 2 without obstructing the drain pin, acts as a mechanical sealing component to isolate the drain hole 7 from the inlet chamber 24. This ensures that the high-pressure fluid in the tubing will not leak into the casing prematurely through the drain hole 7. Only when the tubing is pulled out during well workover operations is the impact rod connected to one end of the sucker rod inserted into the valve body and fall into the guide chamber 24 to impact the drain pin 8 and trigger its breakage. After the drain pin 8 is broken, the fluid in the tubing can be quickly released through the passage of the tubing, the radial window 25 of the drain section 22, the inlet chamber 24, and the drain hole 7. The drainage efficiency is improved by multiple radially evenly distributed windows, achieving pressure balance between the tubing and the casing and ensuring the safety of well workover operations.

[0029] In this embodiment, during well operations, the sealing ring on the core and the mounting cavity of the drain valve body achieve a sealing fit, preventing oil and gas from overflowing or spraying out of the tubing during the lowering of the tubing and sucker rod string. After the sucker rod string is lowered into place, a pump-bumping operation is performed, and the plunger pushes the core downward a certain distance, causing the sealing ring to move with the core and disengage from the mounting cavity to release the seal, thus facilitating the pumping operation. In addition, during well workover operations when pulling out the tubing, the impact rod is deployed to break the drain pin, thereby opening the tubing and drain hole to drain the oil.

[0030] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A knock-over oil drain, characterized in that, include: The drain valve body (1) has an installation cavity and a connection port (13) connected to one end of the installation cavity; A core (2) is disposed in the mounting cavity of the drain valve body (1), and has an oil inlet cavity (24); a positioning structure is provided between the core (2) and the drain valve body (1) to keep their relative positions fixed. The positioning structure includes a first slot (4) and a second slot (5) spaced apart on the inner wall of the mounting cavity, and a retaining spring (6) sleeved on the core (2) for switching positioning between the first slot (4) and the second slot (5); The sealing structure includes a solid part (21) at one end of the core (2) and at least one sealing element (3) on the solid part (21). When the core (2) drives the snap ring (6) to be positioned in the first slot (4), the sealing element (3) contacts the inner wall of the mounting cavity to form a sealing fit. When the core (2) is driven by an external force to move the snap ring (6) to be positioned in the second slot (5), the sealing element moves out of the mounting cavity along with the solid part (21).

2. The impact oil drain of claim 1, wherein: The mounting cavity is a cylindrical cavity extending axially along the drain valve body (1), which includes a first cavity (11) and a second cavity (12) with different diameters. The solid part (21) is fitted in the second cavity (12) and drives the sealing element (3) to make close contact with the inner wall of the second cavity (12).

3. The impact oil drain of claim 2, wherein: At least one annular sealing groove (26) is provided on the outer peripheral sidewall of the solid part (21), and the sealing element (3) is a sealing ring embedded in the annular sealing groove (26).

4. The impact oil drain of any one of claims 1-3, wherein: The core (2) includes a push-receiving part (23), an oil draining part (22) and a solid part (21) connected in sequence along the axial direction. The oil inlet cavity (24) is a cylindrical cavity that is disposed in the push-receiving part (23) and the oil draining part (22) along the axial direction of the core (2). One end of the oil inlet cavity (24) is blocked by the solid part (21), and the other end is an open end disposed in the push-receiving part (23). The oil draining part (22) is slidably connected in the first cavity (11) and the second cavity (12). A radial window hole (25) communicating with the oil inlet cavity (24) is provided on the side wall of the oil draining part (22).

5. The impact oil drain of claim 4, wherein: The first slot (4) and the second slot (5) are arranged axially along the mounting cavity on the inner wall of the second cavity (12), and the first slot (4) is provided with a guide slope.

6. The impact oil drain of claim 5, wherein: The side wall of the push-receiving part (23) is provided with a retaining ring (6) groove for installing the retaining ring (6), and the end of the push-receiving part (23) is provided with a flared opening (27) that communicates with the oil inlet chamber (24).

7. The impactor drain of claim 4, wherein: A first limiting step (14) is formed between the first cavity (11) and the second cavity (12), and a second limiting step (28) is provided between the push-receiving part (23) and the oil draining part (22) opposite to the first limiting adjustment.

8. The impactor drain according to any one of claims 5-7, wherein: The radial window (25) is an elongated hole that extends along the axial direction of the core (2) and is provided on the side wall of the oil drain (22), and there are multiple holes evenly distributed in the circumferential direction.

9. The impactor drain of claim 8, wherein: The side wall of the drain valve body (1) is provided with a drain hole (7) that connects to the mounting cavity. The drain hole is provided with a drain pin (8), which passes through the radial window hole (25) and extends into the oil inlet cavity (24).

10. The impactor drain of claim 1, wherein: The connection port (13) is a tapered interface with a diameter that gradually decreases from the outside to the inside, and its inner wall is provided with a threaded structure.

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