Sucker rod tripping operation blowout preventer with centralizer

Abstract

The utility model relates to a sucker rod tripping operation blowout preventer with a centralizer. The blowout preventer comprises a sleeve body, a discharge valve arranged in the middle of the sleeve body and sealing mechanisms symmetrically arranged at the two ends of the sleeve body. The sealing mechanism comprises an annular pressing piece, two sealing rings and a limiting step which are sequentially arranged from the end of the sleeve body to the inner side, and the annular pressing piece is in threaded connection with the sleeve body and abuts against the two sealing rings. The sucker rod tripping operation blowout preventer with the centralizer is simple in structure and easy to install, the blowout prevention and drainage functions of sucker rod tripping operation can be achieved, and blowout accidents and pollution to the environment are well prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil well operation tools, and particularly relates to a blowout preventer for the up and down operation of sucker rods with centralizers. Background Art

[0002] When the sucker rod of an oil well pumping unit is lifted or lowered, if the downhole pressure is high, the well fluid will continuously flow to the ground, and in the case of high pressure, there may even be a blowout. Currently, most solutions are to preset a downhole blowout preventer downhole during the previous operation. The downhole blowout preventer has been in the harsh downhole environment for a long time and often partially fails or completely fails during the next operation. Therefore, it is still very necessary to add an additional blowout prevention measure to the surface wellhead device during the operation. Firstly, it can prevent safety accidents caused by blowouts, and secondly, it can meet the increasingly strict environmental protection requirements. However, it is not easy to achieve blowout prevention during the up and down operation of sucker rods, especially for sucker rods with centralizers. The diameter of the sucker rod itself and the outer diameter of the sucker rod coupling have a large difference, so the difference with the maximum outer diameter of the centralizer is even greater. Moreover, the axial grooves provided on the outer circle of the centralizer are not in a regular shape at all, resulting in more difficult sealing. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a blowout preventer for the up and down operation of sucker rods with centralizers to meet the blowout prevention needs during the up and down process of sucker rods, aiming at the deficiencies of the existing technology.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A blowout preventer for the up and down operation of sucker rods with centralizers includes a sleeve body, a flow discharge valve arranged in the middle of the sleeve body, and sealing mechanisms symmetrically arranged at both ends of the sleeve body;

[0006] The sealing mechanism includes an annular pressing member, two sealing rings, and a limiting step arranged in sequence from the end of the sleeve body to the inside. The annular pressing member is threadedly connected to the sleeve body and presses against the two sealing rings.

[0007] To better implement the utility model, further optimization is made to the above structure, and support rings are arranged both in the middle and outside of the two sealing rings.

[0008] To better implement the utility model, further optimization is made to the above structure, and a flange is arranged at the end of the outer circle of the sealing ring, and the support ring is buckled on the flange.

[0009] To better implement the utility model, further optimization is made to the above structure, and the end of the inner circle of the sealing ring is an arc structure.

[0010] To better implement the utility model, further optimization is made to the above structure, and a support handle is arranged on the outside of the sleeve body.

[0011] To better implement the present utility model, further optimization is made to the above structure. The annular pressing member provided at the top end of the sleeve body is a compression cap.

[0012] To better implement the present utility model, further optimization is made to the above structure. A rotating handle is provided on the compression cap.

[0013] To better implement the present utility model, further optimization is made to the above structure. The annular pressing member provided at the top end of the sleeve body is a tubing joint.

[0014] To better implement the present utility model, further optimization is made to the above structure. The sealing ring is made of rubber material.

[0015] The present utility model has the following beneficial effects compared with the prior art:

[0016] The blowout preventer for the up and down operation of the sucker rod with a centralizer provided by the present utility model has a simple structure and is easy to install. It can realize the functions of blowout prevention and flow discharge during the up and down operation of the sucker rod, and effectively prevent the occurrence of blowout accidents and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a schematic structural diagram of the blowout preventer for the up and down operation of the sucker rod with a centralizer of the present utility model;

[0019] Figure 2 is a cross-sectional view of the sealing ring in the present utility model.

[0020] In the figure:

[0021] 1 - sleeve body, 2 - flow discharge valve, 3 - annular pressing member, 4 - sealing ring, 401 - flange, 5 - support ring, 6 - limiting step, 7 - support handle, 8 - rotating handle, 9 - sucker rod, 10 - centralizer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0023] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 therefore cannot be understood as limiting the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] Reference Figure 1 and Figure 2 The utility model provides a blowout preventer with a centralizer and a sucker rod lifting and lowering operation, which comprises a sleeve body 1, a relief valve 2 arranged in the middle of the sleeve body 1 and sealing mechanisms symmetrically arranged at both ends of the sleeve body 1.

[0026] The sealing mechanism includes an annular clamping piece 3, two rubber sealing rings 4 and a limiting step 6 which are arranged in sequence from the end of the sleeve body 1 to the inside. The annular clamping piece 3 is threadedly connected to the sleeve body 1 and presses against the two sealing rings 4. The sealing ring 4 is made of high-elasticity modified rubber and has high elasticity and high tearing force.

[0027] Support rings 5 ​​are provided in the middle and outside of the two sealing rings 4. The three support rings 5 ​​work together to fix and clamp the two sealing rings 4. A flange 401 is provided at the end of the outer ring of the sealing ring 4, and the support ring 5 is buckled on the flange 401, so that the sealing ring 4 is stuck in the package of the support ring 5. When the centralizer 10 passes through the sealing ring 4, the sealing ring 4 will not be pulled out and fail.

[0028] As Figure 2 shown, the end of the inner ring of the sealing ring 4 is an arc structure, and the diameter of the inner ring is slightly smaller than the diameter of the sucker rod 9, which can form a sealing structure with the outer circle of the sucker rod 9 and facilitate the passing of the sucker rod 9 and the centralizer 10.

[0029] A support handle 7 is arranged on the outer side of the sleeve body 1, which is convenient for installation.

[0030] The annular pressing member 3 arranged at the top of the sleeve body 1 is a compression nut. By removing the compression nut, the internal parts can be repaired and replaced. A rotating handle 8 is arranged on the compression nut, which is convenient for disassembling and assembling the compression nut and clamping the sealing ring 4. The annular pressing member 3 arranged at the top of the sleeve body 1 is a tubing joint, which is convenient for connecting with the wellhead.

[0031] Working principle:

[0032] When lowering the sucker rod 9, the tubing joint at the bottom of the blowout preventer is connected to the tubing head, and the sucker rod 9 and the centralizer 10 pass through the central hole at the bottom of the blowout preventer.

[0033] When lifting the sucker rod 9, when the centralizer 10 moves upward through the sealing ring 4 at the bottom, at this time, the sealing ring 4 at the top is in close contact with the outer circumference of the sucker rod 9 to form a seal, and no leakage will occur at the top. If the liquid enters the sleeve body 1 from the bottom at this time, the liquid will finally flow out through the drain valve 2 and enter the environmental protection box; when the centralizer 10 completely passes through the sealing ring 4 at the bottom downward, the inner hole of the sealing ring 4 at the bottom shrinks and is in close contact with the outer circumference of the sucker rod 9 to form a seal, sealing the bottom hole flowing liquid; at this time, when the sucker rod 9 is continuously lifted, no blowout will occur through the inner hole of the sealing ring 4 at the top. Therefore, when the centralizer 10 passes through the upper and lower sealing rings 4, the sealing ring 4 always plays a sealing role, and the small amount of liquid brought into the sleeve body 1 will finally flow out through the drain valve 2, realizing blowout prevention during the process of lifting and lowering the sucker rod 9.

[0034] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A blowout preventer for the up and down operation of sucker rods with a centralizer, characterized in that: It includes a sleeve body (1), a drain valve (2) arranged in the middle of the sleeve body (1), and sealing mechanisms symmetrically arranged at both ends of the sleeve body (1); The sealing mechanism includes an annular pressing member (3), two sealing rings (4), and a limiting step (6) sequentially arranged from the end of the sleeve body (1) towards the inside. The annular pressing member (3) is threadedly connected to the sleeve body (1) and presses against the two sealing rings (4).

2. The blowout preventer for the up and down operation of the sucker rod with a centralizer according to claim 1, characterized in that: Support rings (5) are arranged both in the middle and on the outside of the two sealing rings (4).

3. The blowout preventer for the up and down operation of the sucker rod with a centralizer according to claim 2, characterized in that: A flange (401) is arranged at the end of the outer circle of the sealing ring (4), and the support ring (5) is clamped on the flange (401).

4. A blowout preventer for the up and down operation of sucker rods with a centralizer, characterized in that: The end of the inner circle of the sealing ring (4) is an arc structure.

5. A blowout preventer for the up-and-down operation of a sucker rod with a centralizer, according to any one of claims 1-4, characterized in that: A support handle (7) is arranged on the outside of the sleeve body (1).

6. The blowout preventer for the up-and-down operation of sucker rods with a centralizer according to claim 5, characterized in that: The annular pressing member (3) arranged at the top of the sleeve body (1) is a compression cap.

7. The blowout preventer for the up and down operation of the sucker rod with a centralizer according to claim 6, characterized in that: A rotating handle (8) is arranged on the compression cap.

8. A blowout preventer for the up and down operation of sucker rods with a centralizer, characterized in that: The annular pressing member (3) arranged at the top of the sleeve body (1) is a tubing joint.

9. The blowout preventer for the up-and-down operation of sucker rods with a centralizer according to claim 8, characterized in that: The sealing ring (4) is made of rubber.

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