A totally closed wellhead sealing inspection device

Abstract

The application discloses a kind of full closed wellhead sealing inspection device, including plugging tool, hydraulic pump, pressure test pump, numerical display instrument, plugging tool is connected with hydraulic pump by hydraulic pipeline one, plugging tool is connected with pressure test pump by hydraulic pipeline one, pressure test pump is connected with numerical display instrument by sensor connection line.The application is simple to process and manufacture, and the investment is less;It is safe and reliable, and the inspection effect is obvious, and it is recognized by the on-site construction personnel and technical personnel.In field application: it is suitable for the sealing verification inspection after 250 type and 350 type production (gas) tree installation, and the pressure test plugging tool can be quickly assembled according to the matching condition of on-site production (gas) tree and well pipe column.Management personnel can remotely check the production (gas) tree sealing detection condition by mobile phone.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling and downhole operation, and in particular to a fully enclosed wellhead sealing inspection device. Background Art

[0002] The Christmas tree is a wellhead device used in oilfield production and is a crucial piece of equipment at the top of an oil and gas well for controlling and regulating oil and gas production. Currently, during well repair operations, when installing a Christmas tree at the wellhead, the connection between the lower flange and the upper flange of the large crossbar requires manual tightening of 12 screws. However, this connection often suffers from loose or uneven tightening of the screws, or problems with the steel ring and the grooves. This often leads to leaks at the wellhead during oil and gas well production, posing a significant safety hazard to well control. Severe cases can lead to blowouts and environmental pollution. To ensure wellhead safety, there is an urgent need to address the challenge of Christmas tree sealing inspection. Summary of the Invention

[0003] The present invention aims to solve the problem that the sealing of the connection between the lower flange and the upper flange of the large four-way valve cannot be tested after the installation of the oil (gas) tree. It provides a fully enclosed wellhead sealing test device, which realizes the sealing test of the last checkpoint after the installation of the oil (gas) tree, puts an end to the wellhead puncture leakage and ensures the well control safety of the wellhead.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a fully enclosed wellhead sealing inspection device, including a plugging tool, a hydraulic pump, a pressure test pump, and a numerical display instrument. The plugging tool is connected to the hydraulic pump through a hydraulic pipeline 1, and the plugging tool is connected to the pressure test pump through a hydraulic pipeline 1. The pressure test pump is connected to the numerical display instrument through a sensor connecting line.

[0005] Furthermore, the sealing tool includes an upper joint, the central internal thread of the upper joint is connected to the sealing shaft, connecting rod, core shaft, and tail plug in sequence; the external thread of the upper joint is connected to the liquid cylinder, the liquid cylinder is respectively connected to the water supply pipe and the exhaust pipe, and the exhaust pipe is connected to the 35Mpa ball valve; the interior of the liquid cylinder is slidingly and sealingly connected to the short section; the internal thread of the piston is connected to the short section, a spring is installed between the piston and the liquid cylinder, and the short section is connected to the connecting pipe, tail pipe, pressure ring, two rubber cylinders, and tail plug in sequence; the outer circumference of the piston is slidingly and sealingly connected to the liquid cylinder, the inner circumference of the piston is slidingly and sealingly connected to the sealing shaft, and the piston and the short section are sealed.

[0006] Furthermore, the outer diameters of the upper joint and the liquid cylinder are equal, both of which are Φ100mm-Φ130mm, and the upper joint and the liquid cylinder are fastened by hexagon socket screws.

[0007] Furthermore, two sealing rings 4 are provided inside the hydraulic cylinder and are slidably and sealingly connected to the contact portion of the short section.

[0008] Further, the sealing shaft is connected with the connecting rod through the connecting rod coupling.

[0009] Further, the short section is connected with the connecting pipe and the connecting pipe is connected with the tail pipe through the coupling.

[0010] Further, the two rubber tubes are separated through the spacer ring.

[0011] Further, the outer diameters of the compression ring, the rubber tube, the spacer ring and the tail plug are equal, which are Φ48mm-Φ62mm.

[0012] Further, the piston and the short section are connected through the three sealing rings.

[0013] Further, the outer circumference of the piston is slid with the liquid cylinder and is connected through the two sealing rings one, and the inner circumference of the piston is slid with the sealing shaft and is connected through the two sealing rings two.

[0014] The present application is simple in processing and manufacturing, low in investment, safe and reliable, obvious in inspection effect, and is recognized by on-site construction personnel and technical personnel. In on-site application: it is suitable for verifying the sealing property of the 250 type and 350 type production (gas) tree after installation, the management personnel can remotely check the sealing property detection condition of the production (gas) tree by using the mobile phone. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the structural schematic diagram of the present application;

[0016] Figure 2 is the structural schematic diagram of the sealing tool Figure One ;

[0017] Figure 3 is the structural schematic diagram of the sealing tool Figure Two .

[0018] 1. upper joint; 2. liquid cylinder; 3. piston; 4. sealing shaft; 5. spring; 6. water adding pipe; 7. connecting rod coupling; 8. short section; 9. connecting rod; 10. coupling; 11. connecting pipe; 12. mandrel; 13. tail pipe; 14. compression ring; 15. rubber tube; 16. spacer ring; 17. tail plug; 18. inner hexagonal screw; 19. sealing ring one; 20. sealing ring two; 21. sealing ring three; 22. sealing ring four; 23. 35Mpa ball valve; 24. exhaust pipe; 25. sealing tool; 26. hydraulic pipeline one; 27. hydraulic pump; 28. pressure testing pump; 29. numerical display instrument; 30. sensor connecting line. DETAILED DESCRIPTION

[0019] The specific embodiment of the present application is further described below in combination with the Figures 1-3 ​

[0020] A fully closed wellhead sealing inspection device, comprising a plugging tool 25, a hydraulic pump 27, a pressure test pump 28, a numerical display instrument 29, the plugging tool 25 is connected with the hydraulic pump 27 through the hydraulic pipeline 26, the plugging tool 25 is connected with the pressure test pump 28 through the hydraulic pipeline 26, the pressure test pump 28 is connected with the numerical display instrument 29 through the sensor connection line 30.

[0021] The plugging tool 25 comprises an upper joint 1, the central internal thread of the upper joint 1 is connected with a sealing shaft 4, a connecting rod 9, a mandrel 12 and a tail plug 17 in sequence; the sealing shaft 4 is connected with the connecting rod 9 through a connecting rod coupling 7; the external thread of the upper joint 1 is connected with a liquid cylinder 2, the outer diameters of the upper joint 1 and the liquid cylinder 2 are equal, both are Φ100mm-Φ130mm, preferably Φ120mm, the upper joint 1 is fastened with the liquid cylinder 2 through an internal hexagonal screw 18. The liquid cylinder 2 is connected with a water adding pipe 6 and an exhaust pipe 24 respectively, the exhaust pipe 24 is connected with a 35Mpa ball valve 23; the inside of the liquid cylinder 2 has two sealing rings four 22 which are in sliding and sealing connection with the contact parts of a short section 8; the internal thread of a piston 3 is connected with the short section 8, a spring 5 is installed between the piston 3 and the liquid cylinder 2, the short section 8 is connected with a connecting pipe 11, a tail pipe 13, a pressing ring 14, two rubber cylinders 15 and the tail plug 17 in sequence; the two rubber cylinders 15 are separated by a spacer ring 16. The outer diameters of the pressing ring 14, the rubber cylinder 15, the spacer ring 16 and the tail plug 17 are equal, all are Φ48mm-Φ62mm, preferably Φ58mm. The short section 8 and the connecting pipe 11, the connecting pipe 11 and the tail pipe 13 are all connected through a coupling 10. The outer circumference of the piston 3 is in sliding and sealing connection with the liquid cylinder 2 through two sealing rings one 19, the inner circumference of the piston 3 is in sliding and sealing connection with the sealing shaft 4 through two sealing rings two 20, and the piston 3 is sealed with the short section 8 through a sealing ring three 21.

[0022] The tool upper joint 1 has a hydraulic oil inlet hole on the body, the upper end of the body is a 27 / 8〞TBG female buckle which can be connected with a 27 / 8〞TBG tubing short section to play a lifting role. A hole is opened in the middle of the liquid cylinder 2 for exhaust. The lower end of the clamp head can be connected with the Christmas tree gate through a slip. The inside of the liquid cylinder 2 has two sealing rings four 22 which are in sliding and sealing connection with the contact parts of the short section 8 to prevent the leakage of the pressure test medium. The spring 5 can push the piston 3 back after pressure relief. The outer diameters of the pressing ring 14, the rubber cylinder 15, the spacer ring 16 and the tail plug 17 are equal, which can smoothly pass through the Christmas tree and the tubing hanger.

[0023] The numerical display instrument is composed of a sensor module, a display module, a printing module and a data transmission module, etc. The instrument has the functions of online display of pressure curve information, printing and data transmission, etc. A SIM card is built in the numerical display instrument. When the sealing performance of the Christmas tree is detected, the data in the numerical display instrument can be transmitted to the management personnel's mobile phone terminal through wireless network, and the management personnel can remotely view the sealing performance detection situation, which is convenient for the supervision and management of the key nodes of construction.

[0024] In field application, according to the size of the Christmas tree, the connecting pipe 11 and the connecting rod 10 of different sizes are matched to ensure that the rubber tube 15 is located in the oil pipe. The plugging tool 25 is lowered, the plugging tool 25 is connected with the Christmas tree by the slip, the hydraulic pump 27, the pressure test pump 28 and the numerical display instrument 29 are connected. The hydraulic pump 27 is used to press 10-15Mpa, the piston 3 in the plugging tool 25 goes down, the spring 5 is compressed, the nipple 8 connected with the piston 5, the connecting pipe 11, the connecting pipe 11 and the tail pipe 13 push the compression ring 14 to move downward, and the two rubber tubes 15 are compressed and expanded. The rubber tube 15 above is plugged. The test medium is added to the inner cavity of the Christmas tree through the water adding pipe 6, and the air in the inner cavity is discharged through the exhaust pipe 24. After the medium is filled, the pressure test pump 28 is used to press, the maximum pressure can reach 35Mpa, and the pressure is stabilized for 30 minutes. If the pressure drop is less than 0.5Mpa, the design requirement is reached, and it is confirmed that the sealing performance of the Christmas tree installation is qualified. The numerical display instrument 29 can display the pressure test pressure curve information online, and can print the pressure test curve report. At the same time, the management personnel can remotely view the field pressure test curve by using the mobile phone. After the pressure in the inner cavity of the Christmas tree and the pressure in the liquid cylinder 2 are removed, the piston 3 is gradually reset under the operation force of the spring 5, the nipple 8, the connecting pipe 11 and the tail pipe 13 are driven upward, and the two compressed rubber tubes 15 gradually recover to the original state. The connecting pipe 11 and the connecting rod 10 in the device can be processed in different sizes to meet the sealing performance test of Christmas trees of different heights.

[0025] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A fully enclosed wellhead sealing inspection device, characterized in that: The plugging tool (25) comprises a plugging tool (25), a hydraulic pump (27), a pressure test pump (28), and a numerical display instrument (29). The plugging tool (25) is connected to the hydraulic pump (27) through a hydraulic pipeline (26), the plugging tool (25) is connected to the pressure test pump (28) through a hydraulic pipeline (26), and the pressure test pump (28) is connected to the numerical display instrument (29) through a sensor connection line (30); the plugging tool (25) comprises an upper joint (1), the central internal thread of the upper joint (1) is connected to the sealing shaft (4), the connecting rod (9), the core shaft (12), and the tail plug (17) in sequence; the external thread of the upper joint (1) is connected to the hydraulic cylinder (2), and the hydraulic cylinder (2 ) are respectively connected to the water supply pipe (6) and the exhaust pipe (24), and the exhaust pipe (24) is connected to the 35Mpa ball valve (23); the interior of the liquid cylinder (2) is slidably and sealedly connected to the short section (8); the internal thread of the piston (3) is connected to the short section (8), a spring (5) is installed between the piston (3) and the liquid cylinder (2), and the short section (8) is connected to the connecting pipe (11), the tail pipe (13), the pressure ring (14), the two rubber cylinders (15), and the tail plug (17) in sequence; the outer circumference of the piston (3) is slidably and sealedly connected to the liquid cylinder (2), the inner circumference of the piston (3) is slidably and sealedly connected to the sealing shaft (4), and the piston (3) and the short section (8) are sealed.

2. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The outer diameters of the upper joint (1) and the liquid cylinder (2) are equal, both being Φ100mm-Φ130mm. The upper joint (1) and the liquid cylinder (2) are fastened by hexagon socket screws (18).

3. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The interior of the liquid cylinder (2) is provided with two sealing rings (22) which are slidably and sealedly connected to the contact portion of the short section (8).

4. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The sealing shaft (4) is connected to the connecting rod (9) via a connecting rod coupling (7).

5. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The short section (8) and the connecting pipe (11), and the connecting pipe (11) and the tail pipe (13) are all connected via a coupling (10).

6. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The two rubber cylinders (15) are spaced apart by a spacer ring (16).

7. The fully enclosed wellhead sealing inspection device according to claim 6, characterized in that: The outer diameters of the pressure ring (14), the rubber cylinder (15), the spacer ring (16) and the tail plug (17) are equal, and are all Φ48mm-Φ62mm.

8. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The piston (3) and the short section (8) are sealed by a sealing ring (21).

9. The fully enclosed wellhead sealing inspection device according to claim 1, characterized in that: The outer circumference of the piston (3) slides with the cylinder (2) and is sealed by two sealing rings (19), and the inner circumference of the piston (3) slides with the sealing shaft (4) and is sealed by two sealing rings (20).

Images