A wellhead gas collection skid factory commissioning device and method

Abstract

This invention belongs to the field of natural gas collection and compression technology, and particularly relates to a wellhead gas collection skid factory commissioning device and method. The wellhead gas collection skid factory commissioning device includes: a gas source compressor, a buffer tank, a wellhead gas collection skid, gas cylinder group A, and gas cylinder group B. The gas source compressor is connected to the inlet pipe interface of the wellhead gas collection skid via a pipeline. The pipeline is equipped with a buffer tank and ball valve A. The exhaust pipe of the wellhead gas collection skid is connected to gas cylinder group A and gas cylinder group B via two pipelines respectively. Ball valves B and C are respectively installed on the two pipelines. The exhaust pipe of the wellhead gas collection skid is also connected to gas cylinder group A and gas cylinder group B via two pipelines respectively. Ball valves D and E are respectively installed on the two pipelines. This invention provides a wellhead gas collection skid factory commissioning device and method that improves the efficiency of wellhead gas collection skid factory commissioning and reduces costs.

Description

Technical Field

[0001] This invention belongs to the field of natural gas collection and compression technology, and particularly relates to a wellhead gas collection skid factory commissioning device and method. Background Technology

[0002] Existing technology:

[0003] The wellhead gas collection skid is a new product developed by the company in recent years, mainly used for pressurizing and recovering natural gas from remote, scattered wells in oil and gas fields. After the wellhead gas collection skid is manufactured in the factory, it needs to be operated under specified conditions according to the product testing outline to verify the correctness of the design, the performance of the compressor, and the reliability and correctness of operation, including performance indicators such as the exhaust volume, exhaust pressure and temperature, and shaft power of the wellhead gas collection skid. Through testing, any problems are identified and corrected to ensure safe and reliable operation after the product leaves the factory, meeting the user's requirements. Functional testing of the wellhead gas collection skid requires a stable gas source with a pressure of above 3 MPa. In the past, functional testing was carried out using high-pressure nitrogen or compressed air, which had difficulties such as unstable pressure, insufficient gas volume, and inability to achieve gas recovery during the testing process.

[0004] The difficulty and significance of solving the above technical problems:

[0005] Therefore, based on these issues, providing a wellhead gas collection skid factory commissioning device and method that improves commissioning efficiency and reduces costs has significant practical value. Summary of the Invention

[0006] The purpose of this application is to provide a wellhead gas collection skid factory commissioning device and method that improves the commissioning efficiency and reduces the cost of the existing technology in order to solve the technical problems in the prior art.

[0007] The technical solution adopted in this application embodiment to solve the technical problems existing in the prior art is as follows:

[0008] A factory-in-plant commissioning device for wellhead gas collection skids includes: a gas source compressor, a buffer tank, a wellhead gas collection skid, gas cylinder group A, and gas cylinder group B. The gas source compressor is connected to the air inlet port of the wellhead gas collection skid via a pipeline. The pipeline is equipped with a buffer tank and a ball valve A. The exhaust pipe of the wellhead gas collection skid is connected to gas cylinder group A and gas cylinder group B via two pipelines respectively. Ball valves B and C are respectively installed on the two pipelines. The exhaust pipe of the wellhead gas collection skid is connected to gas cylinder group A and gas cylinder group B via two pipelines respectively. Ball valves D and E are respectively installed on the two pipelines.

[0009] The embodiments of this application may also employ the following technical solutions:

[0010] In the aforementioned wellhead gas collection skid factory commissioning device, a safety valve is further provided on the top of the buffer tank, a drain valve is provided at the bottom of the buffer tank, and a pressure gauge A is provided on the buffer tank.

[0011] In the aforementioned wellhead gas collection skid factory debugging device, pressure gauge B is further provided on gas cylinder group A, and pressure gauge C is provided on gas cylinder group B.

[0012] In the above-mentioned wellhead gas collection skid factory debugging device, the pipeline between the gas source compressor and the buffer tank is rubber hose A, the exhaust pipe of the wellhead gas collection skid 7 is rubber hose B, the pipeline connected to the gas cylinder group A is rubber hose C, the pipeline connected to the gas cylinder group B is rubber hose D, and the remaining pipelines are steel pipes.

[0013] A method for factory commissioning of a wellhead gas collection skid, wherein the method uses the wellhead gas collection skid factory commissioning device described in any one of the above-mentioned methods, and the method includes the following steps:

[0014] Step 1:

[0015] S1: Start the gas compressor, open ball valve A, and close ball valves B, C, D, and E;

[0016] S2: Perform leak detection and mark the leak location with special markings;

[0017] S3: Close ball valve A, turn off the gas source compressor, and release the gas stored in the pipeline through the vent in the gas collection skid at the wellhead;

[0018] S4: Address all leaks that have been marked in S2;

[0019] The purpose of step one is to check for leaks.

[0020] Step Two:

[0021] S1: Open ball valve A, start the gas source compressor, and after the pressure in the buffer tank reaches 2.8 MPa, start the wellhead gas collection skid, open ball valve E, and the wellhead gas collection skid will start compressing air into the gas cylinder group B. At the same time, check whether the performance indicators of the wellhead gas collection skid are normal.

[0022] S2: When the pressure inside gas cylinder group B approaches 20 MPa, detect and record the relevant performance parameters of the wellhead gas collection skid;

[0023] S3: Close ball valve A, ball valve E and gas source compressor;

[0024] Step two involves performance testing of the first set of wellhead gas collection skids. Performance indicators for the wellhead gas collection skid in S1 include exhaust volume, exhaust pressure and temperature, and shaft power. Relevant performance parameters for the wellhead gas collection skid in S2 include the skid's main engine speed, inlet and outlet pressure, oil pressure, nominal volumetric flow rate, and shaft power, for analysis and improvement submission. All values ​​should comply with the specifications in the quality certificate.

[0025] Step 3:

[0026] S1: Open ball valves D and C to allow gas cylinder group B to serve as the gas source for the wellhead gas collection skid. After being compressed by the wellhead gas collection skid, the gas returns to gas cylinder group A through hose B and ball valve C. Record the performance indicators of the wellhead gas collection skid again during this process.

[0027] The performance indicators of the S1 wellhead gas collection skid include data such as exhaust volume, exhaust pressure and temperature, and shaft power.

[0028] S2: When the pressure inside the gas cylinder group B drops to close to 2.8 MPa, observe whether the low pressure alarm and automatic shutdown function of the wellhead gas collection skid 7 are normal. When the load test is about to end, open the ball valves of each level of the sewage pipe of the wellhead gas collection skid step by step according to the principle of pressure from high to low.

[0029] S3: After all the sewage pipes of the wellhead gas collection skid have been blown clean, turn off the motor of the wellhead gas collection skid. After 5 to 10 minutes, turn off the fan motor and oil pump motor. After the load test run is completed, open the gas vent in the wellhead gas collection skid to release the gas stored in the pipes. The wellhead gas collection skid debugging is complete.

[0030] This wellhead gas collection skid commissioning method utilizes existing equipment in the factory, uses air as the medium, and is simple to operate, reducing production costs and saving energy.

[0031] One or more technical solutions provided in the embodiments of this application have at least the following beneficial effects:

[0032] 1. This invention utilizes the existing gas source compressor and buffer tank in the factory. The gas source compressor compresses air into the buffer tank to serve as the gas source for the wellhead gas collection skid. The exhaust pressure of the gas source compressor is 2.8 MPa. Calculations show that the gas source compressor can meet the gas volume requirements of the wellhead gas collection skid.

[0033] 2. The working pressure of the buffer tank of this invention is 3 MPa. By modifying the control program parameters of the wellhead gas collection skid, the inlet pressure of the wellhead gas collection skid can be reduced from 3 MPa to 2.8 MPa, which can meet the minimum working conditions of the compressor inside the wellhead gas collection skid. Therefore, the existing equipment in the plant has the conditions for wellhead gas collection skid commissioning, with low commissioning cost, high efficiency, and high equipment utilization.

[0034] 3. This invention utilizes two existing gas cylinder groups in the factory as the exhaust and intake gas sources for the wellhead gas collection skid. By optimizing the design and debugging pipeline layout and adding ball valves to the debugging pipeline, functional testing of the wellhead gas collection skid within the intake pressure range of 2.8-20 MPa can be achieved, which is completely consistent with the pressure range of the on-site working conditions. The testing method is simple and the testing efficiency is high.

[0035] 4. This invention uses air supplied by an air source compressor as the medium. An air storage tank is connected to the outlet of the air source compressor. The pressure is stable, the air volume is sufficient, and it is safe and reliable. This reduces production costs, avoids waste, and saves energy. Attached Figure Description

[0036] The technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this application. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0037] Figure 1 This is a schematic diagram of the debugging process of the present invention.

[0038] In the picture:

[0039] 1. Gas source compressor; 2. Hose A; 3. Safety valve; 4. Buffer tank; 5. Drain valve; 6. Ball valve A; 7. Wellhead gas collection skid; 8. Hose B; 9. Ball valve B; 10. Ball valve C; 11. Ball valve D; 12. Ball valve E; 13. Hose C; 14. Gas cylinder group A; 15. Hose D; 16. Gas cylinder group II; 17. Pressure gauge A; 18. Steel pipe; 19. Pressure gauge B; 20. Pressure gauge C; 21. Vent port Detailed Implementation

[0040] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0041] Example 1

[0042] This embodiment includes a gas source compressor 1, a buffer tank 4, a wellhead gas collection skid 7, a gas cylinder group I 14, and a gas cylinder group B 16.

[0043] The exhaust port of the gas source compressor 1 is connected to the buffer tank 4 via hose A2. The buffer tank 4 is connected to the wellhead gas collection skid 7 via steel pipe 18. The wellhead gas collection skid 7 is connected to the gas cylinder group A14 and the gas cylinder group B16 via steel pipe 18. To facilitate the interconnection between the equipment, hoses B8, C13 and D15 are connected at the interface. Ball valves A6, B9, C10, D11 and E12 are respectively installed on the steel pipe 18.

[0044] The air source compressor 1 consists of two compressors of the same specifications connected in parallel to provide the intake air source.

[0045] Hose A2 is integrated with air source compressor 1, with a working pressure of 10 MPa.

[0046] The buffer tank 4 is equipped with a safety valve 3, a drain port 5, and a pressure gauge 17.

[0047] The working pressure of buffer tank 4 is 3 MPa, which can meet the requirements for commissioning.

[0048] Safety valve 3 has an opening pressure of 3.15 MPa.

[0049] Ball valves A6, B9, C10, D11, and E12 have a working pressure of 25 MPa, which can meet the commissioning requirements.

[0050] Pressure gauge 19 is installed on gas cylinder group A14 to observe the gas pressure inside gas cylinder group I14.

[0051] Pressure gauge 20 is installed on gas cylinder group B16 to observe the gas pressure inside gas cylinder group II16.

[0052] Working process: After the equipment inside the wellhead gas collection skid is assembled, it is transported to an open field. The gas source compressor and the buffer tank are connected together with hose A according to the position shown in the diagram. The buffer tank is connected to the wellhead gas collection skid with a steel pipe. The wellhead gas collection skid is connected to gas cylinder group A and gas cylinder group B. For easy connection, hoses B, C and D are connected between the wellhead gas collection skid and gas cylinder group I and gas cylinder group II respectively.

[0053] Example 2

[0054] First, connect the power supply to the gas source compressor 1 and the wellhead gas collection skid 7. Check that the rotation direction of each motor is correct. After passing the check, start the gas source compressor 1. After the pressure in the buffer tank 3 rises to 2.8 MPa, open ball valve A6 and simultaneously close ball valves B9, C10, D11, and E12. As the pressure in the buffer tank increases, check for air leaks at the pipe connections in the wellhead gas collection skid 7. Use neutral soapy water to check for leaks at each connection and seal. If there are any leaks, mark them. After checking all connections in the wellhead gas collection skid 7, close ball valve A6 and the gas source compressor 1. Release the gas in the pipes through the vent 21 of the wellhead gas collection skid 7 and deal with the marked leaks.

[0055] After completion, reopen ball valve A6 and start air source compressor 1. Once the pressure in buffer tank 4 reaches 2.8 MPa, start wellhead gas collection skid 7 and simultaneously open ball valve E12. Wellhead gas collection skid 7 will begin compressing air into gas cylinder group B16. During this inflation process, check whether the performance indicators of wellhead gas collection skid 7, such as exhaust volume, exhaust pressure and temperature, and shaft power, are normal. When the pressure in gas cylinder group B16 approaches 20 MPa, detect and record relevant performance parameters such as main engine speed, inlet and outlet pressure, oil pressure, nominal volumetric flow rate, and shaft power of wellhead gas collection skid 7 for analysis and improvement submission. All values ​​should meet the specifications in the quality certificate. Then, close ball valve A6, ball valve E12, and air source compressor 1. The performance test of the first group of wellhead gas collection skids is complete.

[0056] Then open ball valves D11 and C10 to allow gas cylinder group B16 to serve as the intake gas source for wellhead gas collection skid 7. The gas is compressed after passing through the inlet gas collection skid 7 and returns to gas cylinder group A14 via hose B8 and ball valve C10. During this process, record the exhaust volume, exhaust pressure, temperature, shaft power, and other relevant data again. When the gas pressure in gas cylinder group B16 approaches 2.8 MPa, carefully observe whether the low-pressure alarm and automatic shutdown function of wellhead gas collection skid 7 are functioning properly. As the load test run is about to end, open each stage of the wellhead gas collection skid 7's drain pipes sequentially from high to low pressure. After all drain pipes of wellhead gas collection skid 7 have been purged, turn off the wellhead gas collection skid motor. After 5-10 minutes, turn off the fan motor and oil pump motor. The load test run is now complete. Open the gas vent 21 inside wellhead gas collection skid 7 to vent the gas remaining in the pipes. The wellhead gas collection skid 7 is now ready for commissioning.

[0057] This wellhead gas collection skid commissioning method utilizes existing equipment in the factory, uses air as the medium, and is simple to operate, reducing production costs and saving energy.

[0058] In summary, this invention provides a wellhead gas collection skid factory commissioning device and method that improves commissioning efficiency and reduces costs.

[0059] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A factory-in-plant commissioning method for a wellhead gas collection skid, characterized in that: The in-plant commissioning method for the wellhead gas collection skid uses an in-plant commissioning device for the wellhead gas collection skid. The in-plant commissioning device for the wellhead gas collection skid includes: a gas source compressor, a buffer tank, a wellhead gas collection skid, gas cylinder group A, and gas cylinder group B. The gas source compressor is connected to the air inlet of the wellhead gas collection skid via a pipeline. The pipeline is equipped with a buffer tank and a ball valve A. The air inlet of the wellhead gas collection skid is connected to gas cylinder group A and gas cylinder group B via two pipelines respectively. The two pipelines are equipped with ball valve B and ball valve D respectively. The exhaust pipe of the wellhead gas collection skid is connected to gas cylinder group A and gas cylinder group B via two pipelines respectively. The two pipelines are equipped with ball valve C and ball valve E respectively. The factory commissioning method for the wellhead gas collection skid includes the following steps: Step 1: S1: Start the gas compressor, open ball valve A, and close ball valves B, C, D, and E; S2: Perform leak detection, check for air leaks at the pipe connections inside the wellhead gas collection skid, and mark the leaks accordingly. S3: Close ball valve A, turn off the gas source compressor, and release the gas stored in the pipeline from the gas vent in the wellhead gas collection skid; S4: Address all leaks that have been marked in S2; Step Two: S1: Open ball valve A, start the gas source compressor, and after the buffer tank pressure reaches 2.8 MPa, start the wellhead gas collection skid, open ball valve E, and the wellhead gas collection skid starts to compress air into the gas cylinder group B. At the same time, check whether the performance indicators of the wellhead gas collection skid are normal. The performance indicators of the wellhead gas collection skid include exhaust volume, exhaust pressure and temperature and shaft power. S2: When the pressure inside gas cylinder group B approaches 20 MPa, detect and record the relevant performance parameters of the wellhead gas collection skid; S3: Close ball valve A, ball valve E and gas source compressor. The relevant performance parameters of the wellhead gas collection skid include the main unit speed, inlet and outlet pressure, oil pressure, nominal volumetric flow rate and shaft power of the wellhead gas collection skid. Step 3: S1: Open ball valves D and C to allow gas cylinder group B to serve as the gas source for the wellhead gas collection skid. After being compressed by the wellhead gas collection skid, the gas returns to gas cylinder group A through hose B and ball valve C. Record the performance indicators of the wellhead gas collection skid again during this process. S2: When the pressure inside the gas cylinder group B drops to close to 2.8 MPa, observe whether the low pressure alarm and automatic shutdown function of the wellhead gas collection skid are normal. When the load test run is about to end, open the sewage pipes of each level of the wellhead gas collection skid step by step according to the principle of pressure from high to low. S3: After all the sewage pipes of the wellhead gas collection skid have been blown clean, turn off the motor of the wellhead gas collection skid. After 5 to 10 minutes, turn off the fan motor and oil pump motor. The load test run is over. Open the gas vent in the wellhead gas collection skid to release the gas stored in the pipes. The wellhead gas collection skid debugging is complete.

2. The wellhead gas collection skid factory commissioning method according to claim 1, characterized in that: The buffer tank is equipped with a safety valve at the top, a drain valve at the bottom, and a pressure gauge A on the buffer tank.

3. The factory commissioning method for the wellhead gas collection skid according to claim 1, characterized in that: Pressure gauge B is installed on gas cylinder group A, and pressure gauge C is installed on gas cylinder group B.

4. The factory commissioning method for the wellhead gas collection skid according to claim 1, characterized in that: The pipe between the gas source compressor and the buffer tank is rubber hose A, the exhaust pipe of the wellhead gas collection skid is rubber hose B, the pipe connected to gas cylinder group A is rubber hose C, the pipe connected to gas cylinder group B is rubber hose D, and the remaining pipes are steel pipes.

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