Matching tool for maintaining wellhead of oil field

Abstract

The invention discloses a matched tool for maintaining a wellhead of an oil field. The matched tool comprises a hoop assembly and a screw rod (2), the hoop assembly and the screw rod (2) form a spiral transmission pair; the hoop assembly is fixedly connected to the connecting pipe of the hoop disc on one side, and the screw takes the hoop disc base body on the opposite side as a fulcrum; applying a rotational torque to the screw, the rotational torque acting between the two hoop discs by the screw drive to expand the hoop; the problems of high labor intensity, low working efficiency and the like of clamp maintenance operation of a Christmas tree due to the absence of a proper tool for maintenance of a wellhead production valve are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of daily maintenance of oil production trees at the wellhead of pumping units, and particularly to a repair and disassembly tool for production valves at the wellhead. Background Art

[0002] At present, oil production trees are used to control production for pumping units and single wells of screw pumps in oil fields. The 250-type oil production tree uses clamp connections. As the production time extends, it is inevitable that the steel ring inside the clamp is damaged, or production failures such as poor sealing due to impurities in the clamp occur.

[0003] Currently, a quick way to solve the above situation is to expand the clamp at a certain interval to replace the steel ring or remove impurities therein for repair operations; due to the high sealing requirements of the oil production tree and being restricted by the overall structure of the oil production tree, the expansion operation is very difficult.

[0004] The current disassembly operation method is to tie the oil production tree with steel wires, and then use on-site equipment such as tractors to forcibly open the clamp, or directly use a crowbar to pry it open by manpower. More often, it is necessary for workers to use a sledgehammer to strike the clamp to loosen the connection, and then use a crowbar to pry it open. No matter which of the above operation methods is adopted, due to the narrow operation space and the non-fixed points to be loosened inside the clamp, the expansion operation is both time-consuming and laborious, and there are often phenomena such as the sledgehammer missing the target or the equipment being deformed by being struck. Therefore, corresponding supporting tools are needed for the repair of production valves at the wellhead. Summary of the Invention

[0005] In view of this, the present invention provides a set of supporting tools for repairing oil field wellheads, which solves the problems such as high labor intensity and low work efficiency in the disassembly operation of the clamp of the oil production tree due to the lack of suitable tools for repairing production valves at the wellhead.

[0006] To achieve the above-mentioned invention purpose, the set of supporting tools for repairing oil field wellheads includes: A clamp assembly and a screw; The clamp assembly and the screw form a screw transmission pair; The clamp assembly is fixedly connected to the connecting pipe of one side of the clamp disc, and the screw takes the base body of the clamp disc on the opposite side as a fulcrum; Apply a rotational torque to the screw, and the rotational torque acts between the two clamp discs through the screw transmission pair to expand the clamp.

[0007] In the present disclosure and possible embodiments, the clamp assembly includes a first clamp body and a second clamp body; One end of the first clamp body and the second clamp body is connected by a bolt shaft, and the other end is connected to a closing and locking structure.

[0008] In the present disclosure and possible embodiments, the closed locking structure includes a closed lead screw; One end of the closing screw is connected to the first hoop body or the second hoop body through a fixed shaft, an interface is provided on the hoop body on the opposite side, and the other end of the closing screw is connected to a nut, and the closing screw is locked in the interface through the nut.

[0009] In the present disclosure and possible embodiments, the screw rod is connected to the first hoop body and the second hoop body respectively.

[0010] In the present disclosure and possible embodiments, through holes are respectively disposed on the first hoop body and the second hoop body.

[0011] In the present disclosure and possible embodiments, the side walls of the clamping openings of the first clamp body and the second clamp body are configured with a clamping tooth structure.

[0012] In the present disclosure and possible embodiments, the screw rod is connected to a force-adding rod.

[0013] In the present disclosure and possible embodiments, a movable top is configured at the bottom end of the screw.

[0014] The present invention has the following beneficial effects: The supporting tool for oilfield wellhead maintenance of the present invention is fixedly connected to a clamp disk connecting pipe on one side of the clamp through a clamp assembly, and then the bottom end of the screw rod is supported on a base body where the clamp disk on the opposite side is located, and a rotational torque is applied to the screw rod. The rotational torque is transmitted to act between the two clamp disks through a transmission connection pair between the clamp assembly and the screw rod. Under the action of the rotational torque, the two clamp disks are expanded to a certain gap, which is convenient for removing impurities in the clamp to be repaired or replacing a damaged steel ring; the supporting tool relies on the supporting structure of the wellhead Christmas tree and utilizes the mechanical jack working principle of the clamp assembly and the screw rod. With a small force, the clamp on the wellhead Christmas tree can be expanded non-destructively and quickly in an effective space, thereby improving work efficiency, saving manpower and material resources, and reducing well downtime. The operation can be completed by one person, which has good economic benefits and successfully solves the problem of difficult expansion operation of the Christmas tree that has long plagued oil producers on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Through the following description of the embodiments of the present invention with reference to the accompanying drawings, those skilled in the art should understand that the accompanying drawings are only provided to illustrate the purpose, features and advantages of the present disclosure, and the accompanying drawings are not actually drawn to scale. In the accompanying drawings: Figure 1 It is a schematic diagram of the structure of a supporting tool for wellhead maintenance and production gate according to an embodiment of the present disclosure; Figure 2 This is a schematic diagram of a first application of a matching tool for repairing a production gate according to an embodiment of the present disclosure; Figure 3 It is the second application schematic diagram of the supporting tool for the wellhead maintenance production gate in the embodiments of the present disclosure. Embodiment

[0016] The present invention will be described below based on embodiments. However, it should be noted that the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can also fully understand the present disclosure.

[0017] At the same time, unless the context clearly requires otherwise, the words such as "including" and "comprising" in the whole specification and claims should be interpreted as the meaning of including rather than exclusive or exhaustive meaning; that is, it is the meaning of "including but not limited to".

[0018] For the purpose of making the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and by way of examples.

[0019] Figure 1 It is the structural schematic diagram of the supporting tool for the wellhead maintenance production gate in the embodiments of the present disclosure; as Figure 1 shown: The supporting tool for the wellhead maintenance production gate includes a hoop assembly and a screw rod 2. The hoop assembly and the screw rod 2 form a screw drive pair. The working principle of the hoop assembly and the screw rod 2 with such a structure is the same as that of a mechanical jack.

[0020] As Figure 2 and Figure 3 shown, during operation, facing the clamp to be repaired connected to the Christmas tree, the hoop assembly is fixedly connected to the connecting pipe of one side clamp disc, and the screw rod 2 takes the base body of the opposite side clamp disc as a fulcrum; applying a rotational torque to the screw rod 2, through the transmission of the screw drive pair, this rotational torque is transmitted between the two clamp discs to achieve the purpose of quickly expanding the clamp.

[0021] The supporting tool of the present disclosure makes full use of the supporting structure of the wellhead Christmas tree and utilizes the working principle of the mechanical jack of the hoop assembly and the screw rod. Therefore, a smaller force can be used in an effective space to achieve non-destructive and rapid expansion of the clamp on the wellhead Christmas tree, thereby effectively improving work efficiency, saving manpower and material resources, reducing the well shut-in time caused by maintenance, and one operator can complete the maintenance task, successfully solving the problem that it is difficult for oil production workers to expand the orifice of the Christmas tree on site for a long time.

[0022] In Figure 1Among them, the hoop assembly described in the embodiments of the present disclosure includes a first hoop body 1 and a second hoop body 7. One end of the first hoop body 1 and the second hoop body 7 is connected by a bolt shaft 8, and the other end is connected to a closing and locking structure; by opening or closing the closing and locking structure, the opening or closing of the hoop assembly is controlled.

[0023] Among them, the closing and locking structure adopted in the embodiments of the present disclosure includes a closing lead screw. One end of the closing lead screw is connected to the first hoop body 1 or the second hoop body 7 through a fixed shaft 4. An interface is provided on the opposite hoop body. The other end of the closing lead screw is connected to a nut 5, and the closing lead screw is locked in the interface through the nut 5. Of course, for this closing and locking structure, other closing and locking structures commonly used in the art can also be adopted, and the present disclosure does not limit this.

[0024] Preferably, screw rods 2 are respectively connected to the first hoop body 1 and the second hoop body 7 in the embodiments of the present disclosure; the configuration of the two screw rods 2 can apply symmetric rotational torques to ensure the uniformity of the force on the clamp disc.

[0025] Preferably, through holes 10 are respectively configured on the first hoop body 1 and the second hoop body 7 in the embodiments of the present disclosure. The through holes 10 play a role in reducing the weight of the tool and at the same time eliminating stress and strengthening the force-bearing structure of the tool.

[0026] Preferably, a tooth structure 6 is configured on the clamping side wall of the first hoop body 1 and the second hoop body 7 in the embodiments of the present disclosure. The configuration of the tooth structure 6 can further ensure the firmness of the connection between the hoop assembly and the pipe body, thereby providing a firm matrix support for the stable transmission of the rotational torque, preventing the tool from moving after being stressed and affecting the torque transmission, and avoiding the unstable phenomenon of the tool swinging left and right during the operation process.

[0027] Preferably, a force-applying rod 9 is connected to the upper end of the screw rod 2 in the embodiments of the present disclosure. Obviously, using manual labor to apply a rotational torque to the screw rod 2 through the force-applying rod 9 is beneficial to reducing the labor intensity and saving manpower.

[0028] Preferably, a movable head 3 is configured at the bottom end of the screw rod 2 in the embodiments of the present disclosure. The bottom area of the screw rod 3 is small, and the function of configuring the movable head 3 can effectively increase the fulcrum area. The increase in the fulcrum area is beneficial to reducing the force on the position where the fulcrum is located, thereby avoiding excessive local force and damaging the matrix at the fulcrum position.

[0029] When using the repair tool supporting the present disclosure for repair operations, first place the second hoop body 7 of the tool on the pipe body connected to the upper clamp disc. After buckling the first hoop body 1 and the second hoop body 7 of the tool through the bolt shaft 8, adjust the position of the closing bolt connected to the fixed shaft 4 and snap it into the interface on the opposite side, and then tighten the nut 5 connected to the top end of the closing lead screw, thereby fixedly connecting the tool to the pipe body.

[0030] The connecting thread between the screw rod 2 and the hoop assembly is a trapezoidal thread. The rotational torque is transmitted to the screw rod 2 through the force - adding rod 9. Utilizing the working principle of a mechanical jack, the movable head 3 at the bottom of the screw rod 2 moves forward to the small cross - joint of the wellhead Christmas tree connected to the lower clamp piece. Since the small cross - joint is a fixed body, it can be used as the force - bearing base. When the rotational torque is transmitted here, a reaction force is generated. Under the action of this reaction force, the gap between the upper clamp disc and the lower clamp disc is gradually enlarged until the degree of hoop expansion meets the operation requirements for cleaning impurities or replacing the steel ring.

[0031] As can be seen from the above description, without the aid of any equipment, the supporting tool of the present disclosure can quickly expand the clamp head by a certain width, thus facilitating the removal and replacement of the steel ring. Moreover, according to the different structures of the Christmas tree and different positions of the clamp, the fixed position can be adjusted. The tool has a wide operating space and a large displacement range, making it convenient for flexible application, and reducing various unsafe risks in the operation of replacing the steel ring to the lowest level. During the operation process, basically no additional equipment or tools are required, effectively reducing the types of tools used and indirectly reducing the working cost. Through on - site application, the maintenance task can be basically completed in 10 minutes, saving time and effort and doubling the work efficiency.

[0032] The supporting tool for wellhead maintenance of the present disclosure has currently been used in the repair of steel ring leakage faults of pumping units, screw pumps, and wellhead Christmas trees in the first area of the Second Oil Production Plant. It has currently been applied to the repair of 80 well clamps. This tool has universality and is suitable for pumping units, screw pump wells, electric pump wells, and well motors of different models and specifications. Without changing the structure of the Christmas tree, it can quickly and conveniently achieve fault elimination. After the application of the tool, the work efficiency is improved, the labor intensity of workers is reduced, and unsafe hidden dangers are eliminated, with significant economic benefits. The application technology is perfect. The on - site application operation standard of the tool is simple to learn and safe and standardized, ensuring personal safety. The adjustment operation time is reduced by about 30 minutes, resulting in significant economic and social benefits. The tool has a fast adjustment speed and a large moving force, and the adjustment meets the inspection requirements. Its structure is simple, the operation is convenient, and the safety is strong. Therefore, it has broad application and promotion value in the oilfield, with significant economic and social benefits.

[0033] The above - described embodiments are only for expressing the implementation modes of the present disclosure, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several deformations, equivalent replacements, improvements, etc. can be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A set of tools for oilfield wellhead maintenance, characterized in that, Comprising: A hoop assembly and a screw rod (2); The hoop assembly and the screw rod (2) form a screw drive pair; The hoop assembly is fixedly connected to the connecting pipe of one side of the clamp disc, and the screw rod takes the base body of the opposite clamp disc as a fulcrum; Applying a rotational torque to the screw rod, and the rotational torque acts between the two clamp discs through the screw drive pair to expand the clamp.

2. The supporting tool for the wellhead maintenance production gate according to claim 1, characterized in that: The hoop assembly includes a first hoop body (1) and a second hoop body (7); One ends of the first hoop body (1) and the second hoop body (7) are connected by a bolt shaft (8), and the other ends are connected to a closing and locking structure.

3. The supporting tool for the wellhead maintenance production gate according to claim 2, characterized in that: The closing and locking structure includes a closing lead screw; One end of the closing lead screw is connected to the first hoop body (1) or the second hoop body (7) through a fixed shaft (4), an interface is provided on the opposite hoop body, the other end of the closing lead screw is connected to a nut (5), and the closing lead screw is locked in the interface through the nut (5).

4. The supporting tool for the wellhead maintenance production gate according to claim 3, characterized in that: The screw rod (2) is respectively connected to the first hoop body (1) and the second hoop body (7).

5. The supporting tool for the wellhead maintenance production gate according to claim 3 or 4, characterized in that: Through holes (10) are respectively arranged on the first hoop body (1) and the second hoop body (7).

6. The supporting tool for the wellhead maintenance production gate according to claim 5, characterized in that: The clamping side walls of the first hoop body (1) and the second hoop body (7) are provided with tooth structures (6).

7. The supporting tool for the wellhead maintenance production gate according to any one of claims 1-4 or 6, characterized in that: The screw rod (2) is connected to a force applying rod (9).

8. The supporting tool for the wellhead maintenance production gate according to claim 5, characterized in that: The screw rod (2) is connected to a force applying rod (9).

9. The supporting tool for the wellhead maintenance production gate according to any one of claims 1-4, 6 or 8, characterized in that: The bottom end of the screw rod (2) is provided with a movable head (3).

10. The supporting tool for the wellhead maintenance production gate according to claim 7, characterized in that: The bottom end of the screw rod (2) is provided with a movable head (3).

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