A shale gas wellhead safety pressure relief device

Abstract

The utility model discloses a shale gas production well mouth's safety pressure relief device, its characterized in that, including technique suit koke, surface suit koke, production oil pipe koke and metal pressure relief pipeline, technique suit koke connects technique suit plug, surface suit koke connects surface suit plug, production oil pipe koke connects production oil pipe plug, the metal pressure relief pipeline has three interfaces, connects technique suit koke, surface suit koke and production oil pipe koke respectively. The pressure relief device of gas production well technique suit, surface suit can realize quick installation and pressure relief by one operator, the device can realize closed pressure relief, realizes zero external discharge, zero pollution, and meets the company's environmental protection and safety standard requirement, and simultaneously also avoids the safety hidden danger problem of original manual dismantling koke thread plug pressure relief and the problem of long operation time, can recycle the gas of unloading, and promotes benefit development.

Description

Technical Field

[0001] This utility model relates to the field of shale gas, and in particular to a safety pressure relief device for shale gas wellheads. Background Technology

[0002] Because gas wellhead square wells are generally high and natural gas is a flammable and explosive gas, the pressure-bearing capacity and sealing performance requirements for gas wellhead square well equipment are much higher than those for oil wellhead equipment. Furthermore, to ensure the safety of personnel operating the gas tree valves during normal gas wellhead production, the higher gas wellhead square wells are backfilled. After backfilling, only the gas tree portion (large four-way and above) remains at the gas wellhead, along with two tubing pipes equipped with pressure gauges connected to the technical casing and gauge casing respectively to display the technical casing and gauge casing pressures. The technical casing and gauge casing pressures at the wellhead are generally zero. Annular pressure build-up can occur due to gas channeling caused by casing cementing quality issues, gas from cement slurry surging up through micro-fractures to the wellhead, and the impact of downhole temperature and pressure changes on the cement sheath as the gas well's production and extraction time increases. Additionally, casing perforation, breakage, and other factors can also cause pressure build-up in the gauge casing and technical casing, resulting in varying pressure gauge readings. To ensure safe production and prevent excessive pressure on the wellhead casing and gauge casing, manual pressure relief is usually required. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of slow manual depressurization and the environmentally unfriendly direct discharge of depressurized gas into the air, and to propose a safety depressurization device for shale gas wellheads.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a safety pressure relief device for shale gas wellheads, characterized in that it includes a technical sleeve cock, a gauge sleeve cock, a tubing end cock, and a metal pressure relief pipeline. The technical sleeve cock is connected to the technical sleeve plug, the gauge sleeve cock is connected to the gauge sleeve plug, the tubing end cock is connected to the production tubing plug, and the metal pressure relief pipeline has three interfaces, which are respectively connected to the technical sleeve cock, the gauge sleeve cock, and the tubing end cock.

[0005] Preferably, it also includes a cock valve at the oil pipe end for controlling the connection and disconnection between the pressure relief device and the oil pipe.

[0006] Preferably, the oil pipe end cock has a pressure bearing capacity of 70 MPa; the oil pipe end cock is also provided with an oil pipe end cock plug to relieve the pressure of the oil pipe cock and the downstream pipeline.

[0007] Preferably, the metal pressure relief pipeline is made of 316 stainless steel with a pressure bearing capacity of 35 MPa, and is equipped with needle valve one, needle valve two, and needle valve three, which are used to cut off and control the pressure relief speed at the oil pipe end, the sleeve end, and the gauge end, respectively.

[0008] Preferably, it also includes a gas sleeve end check valve to prevent gas from flowing back into the gas sleeve when the pressure in the gas sleeve is too high; and a gauge sleeve end check valve to prevent gas from flowing back into the gauge sleeve when the pressure in the gauge sleeve is too high.

[0009] Preferably, it also includes a sleeve pressure gauge for displaying sleeve pressure, with a range of 0-10 MPa; and a gauge sleeve pressure gauge for displaying gauge sleeve pressure, with a range of 0-16 MPa.

[0010] Preferably, it also includes a cock plug at the end of the sleeve for relieving pressure between the sleeve cock and the sleeve check valve; a cock plug at the end of the gauge sleeve for relieving pressure between the gauge cock and the gauge check valve; and a cock needle valve at the end of the sleeve and a cock needle valve at the end of the gauge sleeve for controlling the on / off connection between the pressure relief device and the sleeve and gauge sleeve, respectively.

[0011] Compared with the prior art, the advantages of this utility model are: The depressurization device for the gas well casing and the meter casing can be quickly installed and depressurized by a single operator; the device can perform closed depressurization, achieving zero external discharge and zero pollution, meeting the company's environmental protection and safety standards; it also avoids the safety hazards and long operation time of manually disassembling the cock plug for depressurization; it can recover and reuse the depressurized gas, promoting profitable development. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a safety pressure relief device for a shale gas wellhead proposed in this utility model.

[0013] In the diagram: 1. Pipeline end cock needle valve, 2. Pipeline end cock, 3. Pipeline end cock plug, 4. Needle valve one, 5. Pressure relief line, 6. Sleeve end check valve, 7. Needle valve two, 8. Sleeve pressure gauge, 9. Sleeve end cock plug, 10. Sleeve end cock, 11. Sleeve end cock needle valve, 12. Gauge sleeve end check valve, 13. Needle valve three, 14. Gauge sleeve pressure gauge, 15. Gauge sleeve end cock plug, 16. Gauge sleeve end cock, 17. Gauge sleeve end cock needle valve. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] The shale gas wellhead safety pressure relief device in this embodiment, such as Figure 1As shown, the system includes a technical sleeve cock 10, a gauge sleeve cock 16, a production oil pipe cock 2, and a metal pressure relief line 5. Technical sleeve cock 10 connects to a technical sleeve plug, gauge sleeve cock 16 connects to a gauge sleeve plug, and production oil pipe cock 2 connects to a production oil pipe plug. The metal pressure relief line 5 has three interfaces, connecting to technical sleeve cock 10, gauge sleeve cock 16, and production oil pipe cock 2 respectively.

[0016] The system includes: Pipeline-end cock needle valve 1, used to control the opening and closing of the pressure relief device and the pipeline; Pipeline-end cock 2, with a pressure-bearing capacity of 70 MPa; Pipeline-end cock plug 3, which can relieve pressure on the pipeline cock and downstream lines; Needle valve 4, which can cut off pressure relief from the sleeve and gauge sleeve, and also control the pressure relief rate; Pressure relief pipeline 5, made of 316 stainless steel, with a pressure-bearing capacity of 35 MPa; Sleeve-end check valve 6, which prevents gas from returning to the sleeve when the upstream pressure is too high; Needle valve 7, which can cut off sleeve pressure relief, and also control the sleeve pressure relief rate; Sleeve pressure gauge 8, which displays sleeve pressure with a range of 0-10 MPa; Sleeve-end cock plug 9, which can relieve pressure between the sleeve cock and the sleeve-end check valve; and Pipeline-end cock 10, with a pressure-bearing capacity of 70 MPa. MPa; Technic sleeve end cock needle valve 11, used to control the switching between the pressure relief device and the technician sleeve; Gauge sleeve end check valve 12, to prevent gas from returning to the gauge sleeve when the front-end pressure is too high; Needle valve 13, can cut off the gauge sleeve pressure relief and also control the gauge sleeve pressure relief rate; Gauge sleeve pressure gauge 14, can display the gauge sleeve pressure, with a range of 0-16 MPa; Gauge sleeve end cock plug 15, can relieve the pressure between the gauge sleeve cock and the technician sleeve end check valve; Gauge sleeve end cock 16, pressure bearing capacity is 70 MPa; Gauge sleeve end cock needle valve 17, used to control the switching between the pressure relief device and the technician sleeve.

[0017] A needle valve 4, a needle valve 7, a needle valve 13, a sleeve end check valve 6, and a gauge sleeve end check valve 12 are installed on the metal pressure relief line 5. Needle valve 4 is used to cut off pressure relief at the oil pipe end and control the pressure relief rate; needle valve 7 is used to cut off pressure relief at the sleeve end and control the pressure relief rate; needle valve 13 is used to cut off pressure relief at the gauge sleeve end and control the pressure relief rate. Sleeve end check valve 6 is used to prevent gas from flowing back into the sleeve when the pressure in the sleeve is too high; gauge sleeve end check valve 12 is used to prevent gas from flowing back into the gauge sleeve when the pressure in the gauge sleeve is too high.

[0018] In use, operators only need to open the corresponding needle valve and cock to quickly depressurize the sleeve and gauge sleeve. During the depressurization process, the gas enters the production oil pipeline through the metal depressurization pipeline and then enters the production process, achieving zero external discharge and zero pollution. At the same time, the depressurization speed can be controlled by adjusting the opening of the needle valve to ensure the safety and stability of the depressurization process.

[0019] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A safety pressure relief device for shale gas wellheads, characterized in that, It includes a technical sleeve cock (10), a gauge cock (16), a tubing end cock (2), and a metal pressure relief line (5). The technical sleeve cock (10) is connected to the technical sleeve plug, the gauge cock (16) is connected to the gauge plug, the tubing end cock (2) is connected to the production tubing plug, and the metal pressure relief line (5) has three interfaces, which are respectively connected to the technical sleeve cock (10), the gauge cock (16), and the tubing end cock (2).

2. A safety pressure relief device for shale gas wellheads according to claim 1, characterized in that, It also includes a cock needle valve (1) at the oil pipe end, used to control the connection and disconnection between the pressure relief device and the oil pipe.

3. A safety pressure relief device for shale gas wellheads according to claim 1, characterized in that, The oil pipe end cock (2) has a pressure bearing capacity of 70 MPa; the oil pipe end cock (2) is also equipped with an oil pipe end cock plug (3) to relieve the pressure of the oil pipe cock and the downstream pipeline.

4. A safety pressure relief device for shale gas wellheads according to claim 1, characterized in that, The metal pressure relief pipeline (5) is made of 316 stainless steel and has a pressure bearing capacity of 35 MPa. Needle valve 1 (4), needle valve 2 (7), and needle valve 3 (13) are installed on the metal pressure relief pipeline (5) to cut off and control the pressure relief speed of the oil pipe end, the sleeve end, and the gauge end, respectively.

5. A safety pressure relief device for shale gas wellheads according to claim 1, characterized in that, It also includes a technical sleeve end check valve (6) to prevent gas from flowing back into the technical sleeve when the pressure in the technical sleeve is too high; and a gauge sleeve end check valve (12) to prevent gas from flowing back into the gauge sleeve when the pressure in the gauge sleeve is too high.

6. A safety pressure relief device for shale gas wellheads according to claim 1, characterized in that, It also includes a sleeve pressure gauge (8) for displaying sleeve pressure with a range of 0-10 MPa; and a gauge sleeve pressure gauge (14) for displaying gauge sleeve pressure with a range of 0-16 MPa.

7. A safety pressure relief device for shale gas wellheads according to claim 1, characterized in that, It also includes a cock plug (9) at the end of the sleeve, used to relieve the pressure between the cock plug at the end of the sleeve and the check valve at the end of the sleeve (6); a cock plug (15) at the end of the gauge sleeve, used to relieve the pressure between the cock plug at the end of the gauge sleeve and the check valve at the end of the gauge sleeve (12); a cock needle valve (11) at the end of the sleeve and a cock needle valve (17) at the end of the gauge sleeve, used to control the opening and closing of the pressure relief device with the sleeve and the gauge sleeve, respectively.

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