Nitrogen distribution device for oil-gas well

Abstract

The utility model relates to an oil-gas well nitrogen distribution device which comprises a first pipeline, a second pipeline and a third pipeline. One end of the second pipeline is connected with the other end of the first pipeline; one end of the third pipeline is connected with the other end of the first pipeline, and the other end of the third pipeline is connected with a nitrogen injection port; wherein a pressure stabilizing regulating valve and a pressure transmitter are arranged on the first pipeline in series, a first control unit controls opening and closing of the pressure stabilizing regulating valve, and the pressure transmitter detects the pressure of nitrogen in an injection well and feeds back the pressure to the first control unit; a flow regulation emptying valve is arranged on the second pipeline; a stop valve is arranged on the third pipeline; a second control unit controls opening and closing of the stop valve and obtains the flow of nitrogen at the flow adjusting emptying valve; according to the device, quantitative nitrogen with stable flow can be introduced into the nitrogen injection port, so that stable oil gas is obtained.

Description

Technical Field

[0001] This utility model relates to a liquid nitrogen injection valve, and more particularly to a nitrogen distribution device for oil and gas wells. Background Technology

[0002] During the oil and gas extraction process, nitrogen needs to be injected into the well. The oil and gas are discharged under the pressure of nitrogen. The existing method is to directly introduce the nitrogen generated by the nitrogen injection device into the nitrogen injection port in the well through the pipeline. However, during the above operation, it is impossible to introduce nitrogen into the nitrogen injection port with a stable and controllable flow rate. When excessive nitrogen is introduced, excessive oil and gas will be ejected, affecting the oil and gas extraction efficiency.

[0003] In summary, how to introduce a stable and quantitative flow of nitrogen into the nitrogen injection port has become an urgent problem for researchers in this field. Summary of the Invention

[0004] The technical problem to be solved by this utility model is: how to introduce nitrogen gas with a stable flow rate and a fixed quantity into the nitrogen injection port;

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model relates to a nitrogen distribution device for oil and gas wells, comprising: a first pipeline, one end of which is connected to a nitrogen injection device; a second pipeline, one end of which is connected to the other end of the first pipeline; and a third pipeline, one end of which is connected to the other end of the first pipeline and the other end of which is connected to a nitrogen injection port; wherein, a pressure regulating valve and a pressure transmitter are connected in series on the first pipeline, a first control unit controls the opening and closing of the pressure regulating valve, and the pressure transmitter detects the pressure of nitrogen in the injection well and feeds it back to the first control unit; a flow regulating vent valve is provided on the second pipeline; a shut-off valve is provided on the third pipeline; and a second control unit controls the opening and closing of the shut-off valve and obtains the flow rate of nitrogen at the flow regulating vent valve.

[0007] Furthermore, a pressure stabilizing tank is connected between the pressure regulating valve and the pressure transmitter on the first pipeline, and the inner diameter of the pressure stabilizing tank is larger than the diameter of the first pipeline.

[0008] Furthermore, a safety valve is provided between the other end of the first pipeline and the pressure transmitter, and the safety valve is used to cut off the nitrogen gas in the first pipeline.

[0009] Furthermore, a check valve is provided between the other end of the third pipeline and the shut-off valve.

[0010] Furthermore, a flow meter is installed on the third pipeline, located between the check valve and the shut-off valve. The flow meter detects the flow rate in the third pipeline and feeds it back to the second control unit.

[0011] The beneficial effects of this utility model are as follows: This utility model is a nitrogen distribution device for oil and gas wells. This device can introduce nitrogen with a stable flow rate and a fixed quantity into the nitrogen injection port, thereby obtaining stable oil and gas. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of this device. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0015] See Figure 1 This embodiment is a nitrogen distribution device for oil and gas wells. The left end of the first pipeline 01 in the figure is connected to a nitrogen generator or nitrogen injection device 9. The nitrogen generator or nitrogen injection device 9 can generate nitrogen at 35~50MPa. A pressure regulating valve 1, a pressure tank 2, a pressure transmitter 3, and a safety valve 4 are connected in series on the first pipeline 01. The pressure regulating valve 1 and the pressure transmitter 3 are connected to the first control unit 11.

[0016] The left end of the second pipe 02 is connected to the right end of the first pipe 01. A flow regulating vent valve 5 is installed on the second pipe 02, and the flow regulating vent valve 5 is connected to the second control unit 12.

[0017] The left end of the third pipe 03 is connected to the right end of the first pipe 01, and the right end of the third pipe 03 is connected to a nitrogen injection port 10.

[0018] The function of the pressure regulating valve 1 is to ensure the stability and safety of the injected nitrogen pressure. The pressure regulating valve 1 is specially set up to ensure that the pressure after the valve (nitrogen pressure in the injection well) is constant by receiving the control switch signal of the first control unit 11, thereby improving the stability and reliability of the device.

[0019] The function of the pressure stabilizing tank 2 is to eliminate pressure instability during the flow of the medium. The design of the pressure stabilizing tank with an enlarged volume can ensure stable pressure output (i.e., the inner diameter of the pressure stabilizing tank 2 is larger than the diameter of the first pipe 01), while ensuring that the pressure transmitter 3 accurately measures the nitrogen pressure.

[0020] The function of pressure transmitter 3 is to monitor the nitrogen pressure in the injection well and transmit the detection signal to the first control unit 11.

[0021] Safety valve 4 serves as a safety guarantee for the entire device. It activates when there is overpressure to prevent nitrogen from being injected into the well due to uncontrollable factors, thus preventing safety accidents.

[0022] The function of the flow regulating vent valve 5 is that the second control unit 12 receives the signal transmitted by the flow meter 7, calculates it, and gives a flow control signal. The flow regulating vent valve is adjustable in its full stroke from 0 to 100%. The maximum flow capacity of the valve meets the maximum flow of the nitrogen generator or nitrogen injection equipment 9. By controlling the flow of discharged nitrogen, it ensures that the remaining nitrogen is injected into the well. The flow regulating vent valve 5 needs to be designed with a labyrinth type or other multi-stage pressure reduction structure to ensure the safety of nitrogen venting and reduce vibration and noise.

[0023] The shut-off valve 6 is the on / off valve for the nitrogen injection end. When the nitrogen in the well meets the requirements, the shut-off valve 6 is closed to prevent excessive nitrogen from continuing to be injected. At the same time, it serves as a second protection device to prevent nitrogen backflow in the well and potential safety accidents.

[0024] The flow meter 7 monitors the nitrogen flow rate in the injection well and transmits the detection signal to the second control unit 12.

[0025] Check valve 8 is the first line of defense to prevent nitrogen backflow into the well and potential safety accidents.

[0026] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A nitrogen gas distribution apparatus for oil and gas wells, characterized by, include: The first pipe is connected at one end to a nitrogen injection device; The second pipe has one end connected to the other end of the first pipe; The third pipeline has one end connected to the other end of the first pipeline and the other end connected to the nitrogen injection port. The first pipeline is equipped with a pressure regulating valve and a pressure transmitter connected in series. The first control unit controls the opening and closing of the pressure regulating valve, and the pressure transmitter detects the pressure of nitrogen in the injection well and feeds it back to the first control unit. The second pipeline is equipped with a flow regulating vent valve; the third pipeline is equipped with a shut-off valve; the second control unit controls the opening and closing of the shut-off valve and obtains the flow rate of nitrogen at the flow regulating vent valve.

2. A nitrogen distribution device for oil and gas wells according to claim 1, characterized in that, A pressure stabilizing tank is connected between the pressure regulating valve and the pressure transmitter on the first pipeline, and the inner diameter of the pressure stabilizing tank is larger than the diameter of the first pipeline.

3. A nitrogen distribution device for oil and gas wells as set forth in claim 1, wherein, A safety valve is provided between the other end of the first pipeline and the pressure transmitter. The safety valve is used to cut off the nitrogen gas in the first pipeline.

4. A nitrogen distribution device for oil and gas wells as set forth in claim 1, wherein, A check valve is installed between the other end of the third pipeline and the shut-off valve.

5. A nitrogen distribution device for use in oil and gas wells as defined in claim 4, characterized in that A flow meter is installed on the third pipeline, between the check valve and the shut-off valve. The flow meter detects the flow rate in the third pipeline and feeds it back to the second control unit.

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