A flange device for blowout preventer field pressure test

Abstract

The utility model relates to a flange device for blowout preventer field pressure test belongs to the oil well repair field, including flange body, the liquid inlet channel and the liquid outlet channel are set up in flange body inside, the liquid inlet channel's liquid inlet end is connected with the pressure test connecting device for connecting liquid inlet pipeline, and the liquid outlet end is connected with flange body inner chamber, the pressure test connecting device includes the sealing seat for guaranteeing that liquid can only be positive flow, the liquid outlet end of liquid outlet channel is connected with the pressure relief valve, and the liquid inlet end is connected with the inner chamber of flane body, solve the pump in and the discharge channel problem of pressure test liquid when the full seal and half seal of field blowout preventer ram pressure test, reduced the pressure test cost, simple and convenient operation has improved the pressure test efficiency.

Description

Technical Field

[0001] This utility model relates to a flange device for on-site pressure testing of blowout preventers, belonging to the field of oil well workover. Background Technology

[0002] Currently, during well workover operations in oilfields, blowout preventers (BOPs) must be installed at the wellhead to prevent blowout accidents. According to industry management standards for well control equipment, after maintenance or installation, BOPs must undergo on-site pressure testing simulating downhole conditions to ensure their reliability and prevent blowouts or overflows.

[0003] Currently, the conventional on-site pressure testing method for blowout preventers (BOPs) during downhole operations is as follows: ① When testing the partially sealed gate of the BOP, the tubing hanger is lowered, the hanger's top screw is tightened, and a test section with a plug valve on the upper part (the lower part is a blind plug structure with a screen pipe) is installed on the hanger. The partially sealed gate of the BOP is closed, the test section body is sealed, and then clean water is pumped in from the upper part of the test section to test the partially sealed gate. ② When testing the fully sealed gate of the BOP, a special plugger needs to be lowered to seal the lower passage of the wellhead four-way valve. The fully sealed gate of the BOP is closed, and then clean water is pumped in from the side gate valve of the wellhead four-way valve to test the fully sealed gate. The conventional pressure testing method is complex, costly, and inefficient. Utility Model Content

[0004] The purpose of this utility model is to provide a flange device for on-site pressure testing of blowout preventers, in order to solve the problems of complex operation, high cost and low testing efficiency during the pressure testing of fully sealed and partially sealed gates of blowout preventers.

[0005] To achieve the above objectives, the solution of this utility model includes:

[0006] This utility model provides a flange device for on-site pressure testing of a blowout preventer, comprising a flange body, wherein a liquid inlet channel and a liquid outlet channel are provided within the flange body.

[0007] The inlet end of the liquid inlet channel is connected to a pressure testing connection device for connecting the liquid inlet pipeline, and the outlet end is connected to the inner cavity of the flange body;

[0008] The pressure testing connection device includes a sealing seat to ensure that liquid can only flow in the forward direction;

[0009] The outlet end of the drain channel is connected to the pressure relief valve, and the inlet end is connected to the inner cavity of the flange body.

[0010] During the pressure test, the blowout preventer gate is closed, and the test liquid enters the inner cavity of the flange body through the inlet channel. The test liquid is sealed by the sealing seat to ensure that the test liquid will not flow out in reverse. After the pressure test is qualified, the pressure in the inner cavity of the blowout preventer is released through the drain channel and the pressure relief valve to complete the pressure test. The operation is simple and efficient.

[0011] Furthermore, the sealing seat includes a liquid inlet and a sealing ball for sealing the liquid inlet from the direction of the liquid inlet channel, and also includes an elastic element that applies a force to the sealing ball to seal the liquid inlet.

[0012] By using a sealing ball and an elastic element, pressure can be maintained and stabilized during pressure testing.

[0013] Furthermore, the connection between the liquid inlet channel and the sealing seat forms an annular step facing the sealing seat, and the elastic element is a compression spring, with one end of the compression spring pressing against the annular step and the other end pressing against the sealing ball.

[0014] Furthermore, the inlet and outlet channels are laterally located within the circumference of the flange body.

[0015] Furthermore, the upper and lower end faces of the flange body also include connecting threads for connection with the wellhead four-way and blowout preventer flange, and steel ring grooves for achieving a seal. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the flange device for on-site pressure testing of a blowout preventer according to an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the on-site installation and application structure of a flange device for on-site pressure testing of a blowout preventer according to an embodiment of this utility model;

[0018] In the diagram: 1. Flange body; 101. Inlet channel; 102. Drain channel; 103. Connecting thread; 104. Steel ring groove; 201. Sealing seat; 202. Sealing ball; 203. Compression spring; 1. Flange body; 2. Pressure test connection device; 3. Pressure relief valve; 4. Tubing hanger; 5. Pressure test plug; 6. Blowout preventer; 7. Wellhead cross-connector. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] An embodiment of a flange device for on-site pressure testing of a blowout preventer:

[0021] like Figure 1As shown, the flange device for on-site pressure testing of the blowout preventer in this embodiment includes a flange body 1, a pressure testing connection device 2, and a pressure relief valve 3; wherein the central through hole of the flange body 1 matches the inner diameter of the wellhead blowout preventer; there are transverse liquid inlet channels 101 and liquid outlet channels 102 on the circumference of the flange body, which respectively realize the entry of the test liquid into the central through hole and the discharge. The front of the liquid inlet channel 101 has a connecting thread, which connects to the pressure testing connection head 2, and the front of the liquid outlet channel 102 has a connecting thread, which connects to the pressure relief valve 3; the upper and lower end faces of the flange body 1 are axially evenly distributed with connecting threads 103 and steel ring grooves 104, which respectively realize the connection with the wellhead four-way and the blowout preventer flange, wherein the steel ring groove 104 realizes the sealing connection with the wellhead four-way and the blowout preventer flange.

[0022] The pressure testing connection device 2 has a threaded front end, which is the liquid inlet of the pressure testing connection device 2, used to connect with the liquid inlet of the pressure testing pipeline; the rear end has a threaded rear end, which is the liquid outlet of the pressure testing connection device 2, connected to the liquid inlet channel 101 of the flange body 1; there is a sealing seat 201 in the middle, and a sealing ball 202 is set with the liquid inlet of the sealing seat 201 facing the liquid inlet channel. An annular step is set at the connection between the sealing seat 201 and the liquid inlet channel 101. One end of the compression spring 203 is fixed on the annular step, and the other end is used to hold the sealing ball 202; under the action of the compression spring 203, the sealing ball 202 and the sealing seat 201 achieve a seal, ensuring that the liquid in the through hole in the middle of the flange body 1 will not flow out in reverse, which plays the purpose of maintaining and stabilizing pressure during pressure testing, and can effectively solve the problem of pressure instability due to leakage or pressure fluctuation caused by the performance problems of the pressure testing pump valve.

[0023] The pressure relief valve 3 has a threaded front end, which is the inlet end of the pressure relief valve and is connected to the liquid discharge channel 102 of the flange body 1. It is used to release the internal liquid after the pressure test is completed. The outlet of the pressure relief valve 3 is connected to the pressure relief pipeline for safe pressure relief of the test liquid.

[0024] like Figure 1 , Figure 2 The flange body 1 is installed between the wellhead cross-connector 7 and the blowout preventer 6 via the connecting threads 103 and steel ring groove 104 on the upper and lower end faces of the flange body 1. The tubing hanger 4, which is matched with the wellhead cross-connector 7, is placed in the inner conical hole of the wellhead cross-connector 7, and the set screw of the hanger 4 is tightened. The lower part of the pressure test plug 5 is connected to the upper part of the tubing hanger 4 to seal the tubing hanger 4; the inlet of the pressure test pipeline is threadedly connected to the front of the pressure test connection device 2.

[0025] The pressure test process is as follows:

[0026] Pressure testing of the blowout preventer's full-sealing gate: Close the full-sealing gate of the blowout preventer 6, start the pressure testing pump, and the test fluid flows through the inside of the pressure testing connection device 2, pushing the sealing ball 202 and compressing the compression spring 203. The fluid enters the through hole in the middle of the flange body 1 through the inlet channel 101. At this time, due to the blockage of the tubing hanger 4 and the pressure testing plug 5, the fluid cannot go down and can only go up into the inner cavity below the full-sealing gate of the blowout preventer 6 and above the tubing hanger 4 and the pressure testing plug 5. At this time, according to the well control equipment sealing pressure test procedure, the full-sealing gate of the blowout preventer is subjected to a rated pressure sealing test. After reaching the rated pressure, the pump is stopped. At this time, under the action of the compression spring 203 and the internal pressure, the sealing ball 202 and the sealing seat 201 achieve a seal, ensuring that the fluid in the through hole in the middle of the flange body 1 will not flow out in reverse, thus achieving the purpose of maintaining and stabilizing pressure during the pressure test. After the pressure test is passed, the pressure inside the blowout preventer is released through the drain channel 102 and the pressure relief valve 3 to complete the pressure test of the blowout preventer's full-sealed gate.

[0027] Pressure testing of the semi-sealed gate of the blowout preventer (BOP): Before pressure testing the semi-sealed gate of the BOP 6, a pressure testing short section with a stopcock valve at the top and threads at the bottom, and the threaded connection at the top of the pressure testing plug 5 are required. Close the stopcock valve and the semi-sealed gate of the BOP 6 to seal the pressure testing short section body. Start the pressure testing pump; the pressure testing fluid flows through the inside of the pressure testing connection device 2, pushing the sealing ball 202 and compressing the compression spring 203. The fluid enters the through hole in the middle of the flange body 1 through the inlet channel 101. Due to the oil pipe hanger 4 and the pressure testing plug... With the first 5 plugged, the liquid cannot flow downwards but can only flow upwards into the cavity below the semi-sealing gate of the blowout preventer 6 and above the tubing hanger 4 and the pressure test plug 5. At this point, according to the well control equipment sealing pressure test procedure, the semi-sealing gate of the blowout preventer is subjected to a rated pressure sealing test. After reaching the rated pressure, the pump is stopped. At this time, under the action of the compression spring 203 and the internal pressure, the sealing ball 202 and the sealing seat 201 achieve a seal, ensuring that the liquid in the through hole in the middle of the flange body 1 will not flow backwards, thus achieving the purpose of maintaining and stabilizing pressure during the pressure test. After the pressure test is qualified, the pressure in the cavity of the blowout preventer is released through the drain channel 102 and the pressure relief valve 3, completing the pressure test of the semi-sealing gate of the blowout preventer.

Claims

1. A flange device for blowout preventer field pressure testing, characterized in that, It includes a flange body (1), and the flange body (1) is provided with a liquid inlet channel (101) and a liquid outlet channel (102); The inlet end of the liquid inlet channel (101) is connected to a pressure testing connection device (2) for connecting the liquid inlet pipeline, and the outlet end is connected to the inner cavity of the flange body (1). The pressure testing connection device (2) includes a sealing seat (201) to ensure that liquid can only flow in the positive direction; The outlet end of the drain channel (102) is connected to the pressure relief valve (3), and the inlet end is connected to the inner cavity of the flange body (1).

2. The flange arrangement for field pressure testing of blowout preventers of claim 1, wherein, The sealing seat (201) includes a liquid inlet and a sealing ball (202) for blocking the liquid inlet from the direction of the liquid inlet channel (101), and also includes an elastic element that applies a force to the sealing ball to block the liquid inlet.

3. The flange arrangement for blowout preventer field pressure testing of claim 2, wherein, The connection between the liquid inlet channel (101) and the sealing seat (201) forms an annular step facing the sealing seat (201). The elastic element is a compression spring, with one end of the compression spring pressing against the annular step and the other end pressing against the sealing ball.

4. The flange assembly for blowout preventer field pressure testing of claim 1, wherein, The liquid inlet channel (101) and the liquid outlet channel (102) are laterally opened within the circumference of the flange body (1).

5. The flange assembly for blowout preventer field pressure testing of claim 1, wherein, The upper and lower end faces of the flange body (1) also include connecting threads (103) for connecting with the wellhead four-way and blowout preventer flange and steel ring grooves (104) for achieving sealing.

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