Tool for testing wellhead device and use method of tool

Abstract

The invention provides a tool for a wellhead device test and a using method thereof, and relates to the technical field of wellhead device tests.The tool comprises a bottom annular plate, a long-strip-shaped groove belt is formed in the surface of the bottom annular plate, a hydraulic clamping mechanism is arranged on the top face of the bottom annular plate, and a fixed clamping mechanism is arranged on the top face of the bottom annular plate; flanges with different diameter specifications can be clamped by controlling the front-back moving stroke of a piston rod through a hydraulic system connecting port and changing of the stroke, a long-strip-shaped groove belt is arranged on the surface of a bottom annular plate, the hydraulic clamping mechanism can change and rotate at different angles under the action of an annular plate connecting block, the structure is simple, performance is stable and reliable, and the practicability is high. According to the flange clamping device, rapid clamping of a flange can be achieved, the working efficiency is greatly improved, only one hydraulic clamping mechanism needs to be used in cooperation with the fixed clamping mechanism under the normal condition, and when the diameter of the clamped flange is large or the needed clamping force is large, the two hydraulic clamping mechanisms can be used in cooperation with the fixed clamping mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of wellhead device testing, and particularly relates to a tool for wellhead device testing and a using method thereof. Background Art

[0002] During the pressure test of the overall wellhead device before leaving the factory, the sealing bushing has 6 seals, which can achieve the sealing between the casing mandrel hanger and the tubing head and the casing head housing. After the pressure test is completed, it is necessary to lift the sealing bushing out of the connection body composed of the casing head and the tubing head. When lifting the sealing bushing, due to the large number of seals, the friction between the seals and the connection body is relatively large. When lifting the sealing bushing, the connection body will be lifted together, resulting in difficult and cumbersome removal of the sealing bushing. If the device is inverted and then pressed down, it is not safe and reliable enough;

[0003] Therefore, a tool for wellhead device testing and a using method thereof are designed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problems raised in the above background art.

[0005] The present invention adopts the following technical scheme: a tool for wellhead device testing and a using method thereof, including a bottom ring plate, a long strip groove belt is provided on the surface of the bottom ring plate, a hydraulic clamping mechanism is arranged on the top surface of the bottom ring plate, and a fixed clamping mechanism is arranged on the top surface of the bottom ring plate;

[0006] The hydraulic clamping mechanism includes a ring plate connection block arranged on the bottom surface of the bottom ring plate, a hydraulic cylinder barrel is fixedly installed on the top surface of the ring plate connection block, a piston rod is arranged inside the hydraulic cylinder barrel, and a hydraulic cylinder gland is arranged at the tail end of the hydraulic cylinder barrel;

[0007] The fixed clamping mechanism includes a retaining block fixed on the top surface of the bottom ring plate, a connecting rod is inserted into the retaining block, positioning holes are provided on the side surface of the retaining block and the surface of the connecting rod, a positioning pin is inserted into the positioning hole, a tension spring is sleeved on the surface of the positioning pin, and a pull plate is fixedly installed at the outer end of the positioning pin.

[0008] Preferably, one end of the piston rod and one end of the connecting rod are both provided with slip teeth.

[0009] Preferably, the slip teeth are fixedly connected to the piston rod and the connecting rod through bolts, and the specification of the bolts is M30.

[0010] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, an anti-slip coating is applied to the inner surface of the slip teeth.

[0011] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, sealing rings are provided at one end of the piston rod away from the slip teeth and at the front end of the hydraulic cylinder barrel, and the shape of the sealing ring is O-shaped.

[0012] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, the hydraulic cylinder barrel and the hydraulic cylinder gland are fixed by fixing screws.

[0013] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, the fixing screws are evenly distributed on the surface of the hydraulic cylinder gland.

[0014] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, a hydraulic control pipeline connector is provided on the side surface of the hydraulic cylinder barrel.

[0015] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, one end of the tension spring is fixedly connected to the side surface of the retaining block, and the other end of the tension spring is fixedly connected to the surface of the pull plate.

[0016] Preferably, for a tool for testing a wellhead device and a method for using the same according to the present invention, the following steps are included:

[0017] S1. First, place the device at the sealing positions of the sealing bushing, the casing mandrel hanger, the tubing head, and the casing head housing, and connect the hydraulic cylinder barrel to the hydraulic system connection port through the hydraulic control pipeline connector;

[0018] S2. Control the forward and backward movement stroke of the piston rod through the hydraulic system. The change in the forward and backward stroke of the piston rod can achieve clamping of flanges with different diameter specifications. By sliding the ring plate connecting block inside the long slot belt, different angle changes and rotations can be achieved;

[0019] S3. When the diameter of the clamped flange is larger or a greater clamping force is required, two hydraulic clamping mechanisms and a fixed clamping mechanism can be used in cooperation as needed;

[0020] S4. Then pull the pull plate to disengage the positioning pin from the positioning hole, adjust the position of the connecting rod, fix the adjusted positioning pin in the positioning hole again, clamp and fix the other side of the flange, and then the sealing of the sealing bushing, the casing mandrel hanger, the tubing head, and the casing head housing can be achieved.

[0021] Compared with the prior art, the advantages and positive effects of the present invention are as follows.

[0022] 1. In the present invention, a bottom ring plate, a hydraulic clamping mechanism and a fixed clamping mechanism are provided. The front and rear movement stroke of the piston rod can be controlled through the hydraulic system connection port. The change of the stroke can achieve clamping of flanges with different diameter specifications. Moreover, a long slot belt is arranged on the surface of the bottom ring plate, and the hydraulic clamping mechanism can achieve different-angle changes and rotations under the action of the ring plate connection block. The structure is simple, the performance is stable and reliable, the quick clamping of the flange can be realized, and the working efficiency is greatly improved.

[0023] 2. In the present invention, by coating an anti-slip coating on the surface of the slip jaw teeth, the anti-slip effect of the slip jaw teeth can be increased, and the phenomenon of slipping during the clamping and fixing process can be avoided, which affects the normal use. At the same time, by sleeving a tension spring on the positioning pin surface, the fastening effect of the positioning pin fixation and the automatic reset of the positioning pin can be realized, and the use efficiency is improved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a tool for testing a wellhead device proposed by the present invention;

[0025] Figure 2 is a bottom view of a tool for testing a wellhead device proposed by the present invention;

[0026] Figure 3 is a side view of a tool for testing a wellhead device proposed by the present invention;

[0027] Figure 4 is a schematic diagram of the hydraulic clamping mechanism of a tool for testing a wellhead device proposed by the present invention;

[0028] Figure 5 is a left view of the hydraulic clamping mechanism of a tool for testing a wellhead device proposed by the present invention;

[0029] Figure 6 is a cross-sectional view of the hydraulic clamping mechanism of a tool for testing a wellhead device proposed by the present invention;

[0030] Figure 7 is a right view of the hydraulic clamping mechanism of a tool for testing a wellhead device proposed by the present invention;

[0031] Figure 8 is a schematic diagram of the fixed clamping mechanism of a tool for testing a wellhead device proposed by the present invention;

[0032] Figure 9 is a side view of the fixed clamping mechanism of a tool for testing a wellhead device proposed by the present invention;

[0033] Figure 10 is a schematic diagram of the positioning pin of a tool for testing a wellhead device proposed by the present invention.

[0034] LEGEND DESCRIPTION:

[0035] 1. Bottom ring plate; 101. Long strip groove belt;

[0036] 2. Hydraulic clamping mechanism; 201. Ring plate connecting block; 202. Hydraulic cylinder barrel; 203. Piston rod; 204. Hydraulic cylinder gland; 205. Sealing ring; 206. Fixing screw; 207. Hydraulic control pipeline connector;

[0037] 3. Fixed clamping mechanism; 301. Retaining block; 302. Connecting rod; 303. Positioning hole; 304. Positioning pin; 305. Tension spring; 306. Pulling plate;

[0038] 4. Slip teeth; 5. Bolt. Specific implementation mode

[0039] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0040] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0041] Embodiment

[0042] Please refer to Figures 1-10 , the present invention provides a technical solution: a tool for wellhead device test and its use method, including a bottom ring plate 1, a long strip groove belt 101 is provided on the surface of the bottom ring plate 1, and the ring plate connecting block 201 can slide in the long strip groove belt 101, so as to drive the hydraulic cylinder barrel 202 to move, realizing the change and rotation of different angles of the hydraulic clamping mechanism 2. The hydraulic clamping mechanism 2 is arranged on the top surface of the bottom ring plate 1, and the fixed clamping mechanism 3 is arranged on the top surface of the bottom ring plate 1;

[0043] The hydraulic clamping mechanism 2 includes a ring plate connecting block 201 disposed on the bottom surface of the bottom ring plate 1. The top surface of the ring plate connecting block 201 is fixedly installed with a hydraulic cylinder barrel 202. A hydraulic control pipeline connector 207 is disposed on the side surface of the hydraulic cylinder barrel 202. Through the connection between the hydraulic system connection port and the hydraulic control pipeline connector 207, the piston rod 203 is driven to move inside the hydraulic cylinder barrel 202, thereby adjusting the position of the jaw 4 and controlling the forward and backward movement stroke of the piston rod 203. The change in the stroke can achieve clamping of flanges with different diameter specifications. The hydraulic cylinder barrel 202 and the hydraulic cylinder gland 204 are fixed by fixing screws 206. The fixing screws 206 are evenly distributed on the surface of the hydraulic cylinder gland 204. By rotating the fixing screws 206, the tightening degree of the connection can be adjusted to meet different fixing requirements. Moreover, the fixing screws 206 can maintain the stability of the connection under vibration and impact, effectively preventing the components from loosening. At the same time, the production cost of the fixing screws 206 is low, reducing the use cost. The piston rod 203 is disposed inside the hydraulic cylinder barrel 202, and the end of the hydraulic cylinder barrel 202 is provided with a hydraulic cylinder gland 204. Sealing rings 205 are disposed at both ends of the piston rod 203 away from the jaw 4 and the front end of the hydraulic cylinder barrel 202. The shape of the sealing ring 205 is O-shaped. The O-shaped sealing ring 205 can improve the sealing effect between the piston rod 203 and the hydraulic cylinder barrel 202, avoiding affecting the movement stroke of the piston rod 203 inside the hydraulic cylinder barrel 202 due to poor sealing performance;

[0044] The fixed clamping mechanism 3 is mainly composed of a retaining block 301 located on the top of the bottom ring plate 1. A connecting rod 302 is embedded inside the retaining block 301. The two are precisely docked through alignment positioning holes 303 opened on the side and the surface. To enhance the structural stability and adjustment flexibility, a positioning pin 304 is inserted into the positioning hole 303, and a tension spring 305 is assembled on its outer surface, forming an elastic fixing mechanism. The two ends of the tension spring 305 are firmly connected to the side surface of the retaining block 301 and the surface of the pull plate 306 respectively, and the pull plate 306 is fixed to the outer end of the positioning pin 304. Such a design is not only convenient for operation but also can provide additional pulling force or adjustment space when needed. In a conventional operation scenario, only one hydraulic clamping mechanism 2 and the fixed clamping mechanism 3 working together can meet the requirements. However, in the face of flanges with a larger diameter or higher clamping force requirements, the system design allows for flexible additional configuration to use two hydraulic clamping mechanisms 2 and the fixed clamping mechanism 3 jointly to adapt to the fastening requirements under different working conditions and ensure the safety and efficiency of the operation;

[0045] One end of the piston rod 203 and one end of the connecting rod 302 are both provided with slip teeth 4. The slip teeth 4 and the piston rod 203, and the connecting rod 302 are fixedly connected by bolts 5 respectively. The specification of the bolt 5 is M30. The inner surface of the slip teeth 4 is coated with anti-slip coating, which can increase the anti-slip effect of the slip teeth 4 and avoid slipping during the clamping and fixing process, thus affecting the normal use.

[0046] Working principle: The usage method of a tool for wellhead device test includes the following steps:

[0047] S1. First, place the device at the sealing positions of the sealing bushing, the casing mandrel hanger, the tubing head and the casing head housing, and connect the cylinder barrel 202 of the hydraulic cylinder to the hydraulic system connection port through the hydraulic control pipeline connector 207;

[0048] S2. Control the forward and backward movement stroke of the piston rod 203 through the hydraulic system. The change of the forward and backward stroke of the piston rod 203 can realize clamping of flanges with different diameter specifications. Slide the ring plate connecting block 201 inside the long slot belt 101 to realize changes and rotations at different angles;

[0049] S3. When the diameter of the clamped flange is larger or a greater clamping force is required, two hydraulic clamping mechanisms 2 and the fixed clamping mechanism 3 can be used in cooperation as the case may be;

[0050] S4. Then pull the pull plate 306. The pull plate 306 pulls the tension spring 305 outwards, so that the positioning pin 304 disengages from the positioning hole 303, and adjust the position of the connecting rod 302. Under the automatic restoration of the tension spring 305, the adjusted positioning pin 304 is driven to be fixed in the positioning hole 303 to clamp and fix the other side of the flange. Then, the sealing connection of the sealing bushing, the casing mandrel hanger, the tubing head and the casing head housing can be carried out.

[0051] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A tool for wellhead device testing, comprising a bottom ring plate (1), characterized in that: The surface of the bottom ring plate (1) is provided with a long strip groove belt (101), and a hydraulic clamping mechanism (2) is arranged on the top surface of the bottom ring plate (1), and a fixed clamping mechanism (3) is arranged on the top surface of the bottom ring plate (1); The hydraulic clamping mechanism (2) includes a ring plate connecting block (201) arranged on the bottom surface of the bottom ring plate (1), a hydraulic cylinder barrel (202) is fixedly installed on the top surface of the ring plate connecting block (201), a piston rod (203) is arranged inside the hydraulic cylinder barrel (202), and a hydraulic cylinder gland (204) is arranged at the tail end of the hydraulic cylinder barrel (202); The fixed clamping mechanism (3) includes a retaining block (301) fixed on the top surface of the bottom ring plate (1), a connecting rod (302) is inserted into the retaining block (301), positioning holes (303) are formed on the side surface of the retaining block (301) and the surface of the connecting rod (302), a positioning pin (304) is inserted into the positioning holes (303), a tension spring (305) is sleeved on the surface of the positioning pin (304), and a pull plate (306) is fixedly installed at the outer end of the positioning pin (304).

2. The tool for testing the wellhead device according to claim 1, characterized in that: One end of the piston rod (203) and one end of the connecting rod (302) are both provided with jaw teeth (4).

3. The tool for testing the wellhead device according to claim 2, characterized in that: The jaw teeth (4) are fixedly connected with the piston rod (203) and the connecting rod (302) through bolts (5), and the specification of the bolts (5) is M30.

4. The tool for testing the wellhead device according to claim 3, characterized in that: The inner surface of the jaw teeth (4) is coated with anti-slip paint.

5. The tool for testing the wellhead device according to claim 4, characterized in that: Sealing rings (205) are arranged at one end of the piston rod (203) far away from the jaw teeth (4) and the front end of the hydraulic cylinder barrel (202), and the shape of the sealing rings (205) is O-shaped.

6. The tool for testing the wellhead device according to claim 5, characterized in that: The hydraulic cylinder barrel (202) and the hydraulic cylinder gland (204) are fixed through fixing screws (206).

7. The tool for testing the wellhead device according to claim 6, wherein: The fixing screws (206) are evenly distributed on the surface of the hydraulic cylinder gland (204).

8. The tool for testing the wellhead device according to claim 7, wherein: A liquid control pipeline connector (207) is arranged on the side surface of the hydraulic cylinder barrel (202).

9. The tool for testing the wellhead device according to claim 8, characterized in that: One end of the tension spring (305) is fixedly connected with the side surface of the retaining block (301), and the other end of the tension spring (305) is fixedly connected with the surface of the pull plate (306).

10. The usage method of the tool for testing the wellhead device according to any one of claims 1-9, characterized in that: It includes the following steps: S1. First, place the device at the sealing positions of the sealing bushing, the casing mandrel hanger, the tubing head, and the casing head housing, and connect the hydraulic cylinder barrel (202) with the hydraulic system connection port through the liquid control pipeline connector (207); S2. Control the forward and backward movement stroke of the piston rod (203) through the hydraulic system. The change of the forward and backward stroke of the piston rod (203) can realize the clamping of flanges with different diameter specifications. By sliding the ring plate connecting block (201) inside the long strip groove belt (101), different angle changes and rotations can be realized; S3. When the diameter of the clamped flange is large or a greater clamping force is required, two hydraulic clamping mechanisms (2) and the fixed clamping mechanism (3) can be used in cooperation as required; S4. Then pull the pull plate (306) again to disengage the positioning pin (304) from the positioning hole (303), adjust the position of the connecting rod (302), fix the adjusted positioning pin (304) in the positioning hole (303) again, clamp and fix the other side of the flange, and then the sealing bush, the casing mandrel hanger and the tubing head and the casing head housing can be sealed.

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