Pressure reducing device for gas lift wellhead of differential pressure type compressor

Abstract

The utility model discloses a differential pressure type compressor gas lift wellhead decompression device, which relates to the technical field of drainage gas recovery matching devices and comprises a gas inlet pipe and a gas outlet pipe, a decompression separation chamber is arranged between the gas inlet pipe and the gas outlet pipe, and an adjusting mechanism is arranged in the decompression separation chamber. A gas-liquid channel, a gas-liquid separation cavity, a pressure reduction channel and a mounting cavity are formed in the pressure reduction separation chamber, the adjusting mechanism comprises a waterproof motor, a lead screw and a piston, the adjusting mechanism is arranged, the waterproof motor drives the lead screw to rotate, and the lead screw drives the piston to move on the inner side of the gas-liquid channel, so that the pressure reduction channels from the first layer to the third layer leak out; compared with a spring structure, the device is driven and adjusted by a waterproof motor, so that the device has higher stability, does not generate elastic fatigue and permanent deformation like a spring, and solves the problem that the service life of an existing device is shorter.

Description

Technical Field

[0001] This utility model relates to the technical field of drainage and gas extraction supporting devices, and in particular to a differential pressure compressor gas lift wellhead pressure reduction device. Background Technology

[0002] The compressor (nitrogen) gas lift requires the mixed gas and liquid phases lifted from the bottom of the well to the wellhead for release downstream of the wellhead. The release efficiency depends on the downstream pressure at the wellhead. During the release process, the instantaneous pressure at the wellhead is controlled by adjusting the downstream throttle valve.

[0003] Currently, most compressor (nitrogen) gas lift processes adopt a downstream liquid discharge closed gathering and transportation process. The effectiveness of this process depends on the pressure of the gas gathering trunk line. When the pressure of the gas gathering trunk line exceeds 5MPa, the mixed gas and liquid lifted from the bottom of the well to the wellhead will form an overpressure phenomenon at the downstream throttle valve, which will lead to damage to the downstream throttle valve or even pipeline rupture.

[0004] Currently, a differential pressure compressor gas lift wellhead pressure reduction device, disclosed in publication number (CN212054648U), has a pressure reduction channel in its pressure reduction separation chamber connected to the inlet pipe, and a gas-liquid separation channel connected to the outlet pipe. Each set of guide units connects the pressure reduction channel to the gas-liquid separation channel and performs step-by-step pressure reduction along the direction from the inlet pipe to the outlet pipe. Each guide unit includes at least two guide channels. A slide valve structure is installed within the pressure reduction channel for depressurizing the guide channels of each set of guide units. A drain valve is installed in the drain channel at the bottom of the gas-liquid separation channel to drain the separated liquid. A pressure detection element is installed on both the inlet and outlet pipes. This invention also discloses a method for using the above-mentioned pressure reduction device for compressor gas lift wellhead pressure reduction. This invention's wellhead pressure reduction device ensures continuous compressor operation, improves drain efficiency, and guarantees the continuity of the compressor gas lift operation.

[0005] The existing device has been found to have at least the following technical problems during actual use;

[0006] The existing device uses a spring and a conical piston head to block the flow channel. When overpressure occurs, the piston head will compress the spring for a long time and keep it in a state of extreme compression. The spring material will become fatigued due to the long-term extreme compression, causing its elasticity to decrease and affecting the reset of the conical piston head. Therefore, the device has a short service life. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a differential pressure compressor air lift wellhead pressure reducing device, solving the problem of the short service life of existing devices.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A differential pressure compressor gas lift wellhead pressure reducing device includes an inlet pipe and an outlet pipe, a pressure reducing separation chamber is provided between the inlet pipe and the outlet pipe, an adjustment mechanism is provided in the pressure reducing separation chamber, the pressure reducing separation chamber is provided with a gas-liquid channel, a gas-liquid separation chamber, a pressure reducing channel and an installation chamber, and the adjustment mechanism includes a waterproof motor, a lead screw and a piston.

[0010] Preferably, a first pressure gauge is fixedly connected to the middle section of the air inlet pipe, a second pressure gauge is fixedly connected to the middle section of the air outlet pipe, and a liquid outlet pipe is fixedly connected to the bottom of the pressure reducing and separation chamber.

[0011] Preferred configuration: A waterproof motor is fixedly installed inside the mounting cavity, and a conduit is fixedly connected to the top surface of the waterproof motor. A PLC controller is fixedly connected to the end of the conduit away from the waterproof motor, and the PLC controller is fixedly connected to the outer wall of the pressure reducing and separation chamber.

[0012] Preferably, in the depressurization separation chamber, the gas-liquid separation chamber is located on the outside, the gas-liquid channel is located on the inside, the gas-liquid channel is connected to the inlet pipe, and the gas-liquid separation chamber is connected to the outlet pipe.

[0013] Preferably, the pressure reducing channel has three layers, with four pressure reducing channels in each layer. The two ends of the pressure reducing channel are connected to the gas-liquid channel and the gas-liquid separation chamber, respectively.

[0014] Preferably, the output end of the waterproof motor is fixedly connected to the lead screw, a first sealing sleeve is fixedly connected to the side of the waterproof motor near the lead screw, the first sealing sleeve is rotatably connected to the output end of the waterproof motor, and a second sealing sleeve is fixedly connected to the end of the waterproof motor away from the first sealing sleeve.

[0015] Preferably, a fixing rod is fixedly connected to the inner side of the air intake pipe, and a support shaft is fixedly connected to the middle section of the fixing rod. The support shaft is rotatably connected to the end of the lead screw away from the waterproof motor.

[0016] Preferred configuration: The piston is threadedly connected to the lead screw, the piston is slidably connected to the inner wall of the gas-liquid channel, and guide rods are fixedly connected to both ends of the fixed rod. The ends of the two guide rods away from the fixed rod are fixedly connected to the waterproof motor, and the two guide rods pass through the piston and are slidably connected to it.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] I. This application, by setting an adjustment mechanism, uses a waterproof motor to drive the lead screw to rotate, and the lead screw to drive the piston to move inside the gas-liquid channel. Compared with the spring structure, this application is driven by a waterproof motor for adjustment, which makes this application have higher stability and will not suffer from elastic fatigue and permanent deformation like a spring, thus solving the problem of the short service life of the existing device.

[0019] II. This application, by setting an adjustment mechanism, is driven by a waterproof motor for adjustment. The lead screw and piston work together to block the pressure reduction channel at the rear, giving this application high control precision. The piston can be positioned at any position on the lead screw, and the control is based on the pressure magnitude, thus giving this application high control precision. Attached Figure Description

[0020] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a half-section side view of the present invention;

[0022] Figure 2 This is a three-dimensional structural view of the present invention in half-section;

[0023] Figure 3 This is a structural diagram of the gas-liquid channel and pressure-reducing channel of this utility model;

[0024] Figure 4 This is a structural diagram of the adjustment mechanism of this utility model.

[0025] Legend: 1. Inlet pipe; 2. Outlet pipe; 3. Gas-liquid channel; 4. Gas-liquid separation chamber; 5. First pressure gauge; 6. Liquid outlet pipe; 7. Adjustment mechanism; 8. PLC controller; 9. Conduit; 301. Pressure reducing channel; 302. Mounting cavity; 501. Second pressure gauge; 701. Waterproof motor; 702. First sealing sleeve; 703. Lead screw; 704. Support shaft; 705. Fixing rod; 706. Piston; 707. Guide rod; 708. Second sealing sleeve. Detailed Implementation

[0026] This application provides a differential pressure compressor air lift wellhead pressure reduction device, which effectively solves the problem of the short service life of existing devices.

[0027] Example

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application embodiment effectively solves the technical problem of the short service life of the existing device. The overall idea is as follows:

[0029] To address the problems existing in the prior art, this utility model provides a pressure reduction device for a differential pressure compressor gas lift wellhead, including an inlet pipe 1 and an outlet pipe 2. A pressure reduction separation chamber is provided between the inlet pipe 1 and the outlet pipe 2. An adjustment mechanism 7 is provided in the pressure reduction separation chamber. The pressure reduction separation chamber is provided with a gas-liquid channel 3, a gas-liquid separation chamber 4, a pressure reduction channel 301, and an installation chamber 302. The adjustment mechanism 7 includes a waterproof motor 701, a lead screw 703, and a piston 706.

[0030] A first pressure gauge 5 is fixedly connected to the middle section of the air inlet pipe 1, a second pressure gauge 501 is fixedly connected to the middle section of the air outlet pipe 2, and a liquid outlet pipe 6 is fixedly connected to the bottom of the pressure reducing and separation chamber.

[0031] A waterproof motor 701 is fixedly installed inside the mounting cavity 302. A wire conduit 9 is fixedly connected to the top surface of the waterproof motor 701. A PLC controller 8 is fixedly connected to the end of the wire conduit 9 away from the waterproof motor 701. The PLC controller 8 is fixedly connected to the outer wall of the pressure reducing separation chamber.

[0032] In the decompression separation chamber, the gas-liquid separation chamber 4 is located on the outside, and the gas-liquid channel 3 is located on the inside. The gas-liquid channel 3 is connected to the inlet pipe 1, and the gas-liquid separation chamber 4 is connected to the outlet pipe 2.

[0033] The pressure reducing channel 301 has three layers, with four pressure reducing channels 301 in each layer. The two ends of the pressure reducing channel 301 are connected to the gas-liquid channel 3 and the gas-liquid separation chamber 4, respectively.

[0034] The output end of the waterproof motor 701 is fixedly connected to the lead screw 703. A first sealing sleeve 702 is fixedly connected to the side of the waterproof motor 701 near the lead screw 703. The first sealing sleeve 702 is rotatably connected to the output end of the waterproof motor 701. A second sealing sleeve 708 is fixedly connected to the end of the waterproof motor 701 away from the first sealing sleeve 702.

[0035] A fixing rod 705 is fixedly connected to the inner side of the air intake pipe 1. A support shaft 704 is fixedly connected to the middle section of the fixing rod 705. The support shaft 704 is rotatably connected to the end of the lead screw 703 away from the waterproof motor 701.

[0036] The piston 706 is threadedly connected to the lead screw 703, and the piston 706 is slidably connected to the inner wall of the gas-liquid channel 3. Both ends of the fixed rod 705 are fixedly connected to the guide rod 707. The ends of the two guide rods 707 away from the fixed rod 705 are fixedly connected to the waterproof motor 701. Both guide rods 707 pass through the piston 706 and are slidably connected to it.

[0037] Working principle:

[0038] This application mainly separates the natural gas mixed with liquid after depressurization by the three-layer depressurization channel 301, and discharges the separated natural gas into the ground pipeline through the gas outlet pipe 2. The separated liquid is collected in the concave cavity of the gas-liquid separation chamber 4 and discharged through the liquid outlet pipe 6. When the first pressure gauge 5 detects that the pressure in the gas inlet pipe 1 is too high;

[0039] The first layer of pressure reducing channels 301 has four pressure reducing channels 301 at 120° on the cross-section of the device. When the fluid pressure flowing into the inlet pipe 1 is less than 4MPa (detected by the first pressure gauge 5), the waterproof motor 701 drives the lead screw 703 to rotate. The lead screw 703 drives the piston 706 to move inside the gas-liquid channel 3, causing the pressure reducing channel 301 near the end of the inlet pipe 1 to leak out. At this time, the gas and liquid mixture enters the four pressure reducing channels 301 of the first layer and is depressurized and separated in the gas-liquid separation chamber 4. Then the gas enters the ground pipeline through the outlet pipe 2, and the liquid slides to the liquid outlet pipe 6 at the bottom of the gas-liquid separation chamber 4 for collection and discharge.

[0040] When the fluid pressure flowing into the inlet pipe 1 is in the range of 4MPa-8MPa, the waterproof motor 701 drives the piston 706 to move towards the waterproof motor 701, thus exposing the second-layer pressure-reducing channel 301. At this time, the gas-liquid mixture enters the first and second layers of a total of eight pressure-reducing channels 301 and is then depressurized and separated in the gas-liquid separation chamber 4.

[0041] In the third pressure-reducing channel 301, when the fluid pressure flowing into the inlet pipe 1 is greater than 8MPa, the waterproof motor 701 drives the piston 706 to move towards the waterproof motor 701, thus exposing the third pressure-reducing channel 301. At this time, the gas-liquid mixture enters the three layers of twelve pressure-reducing channels 301 and is then depressurized and separated in the gas-liquid separation chamber 4. Subsequently, the gas enters the ground pipeline through the outlet pipe 2, and the liquid slides down to the liquid outlet pipe 6 at the bottom of the gas-liquid separation chamber 4 for collection and discharge.

[0042] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A differential pressure compressor gas lift wellhead pressure reduction device, characterized in that, It includes an air inlet pipe (1) and an air outlet pipe (2), and a pressure reduction separation chamber is provided between the air inlet pipe (1) and the air outlet pipe (2), and an adjustment mechanism (7) is provided in the pressure reduction separation chamber. The pressure-reducing separation chamber is equipped with a gas-liquid channel (3), a gas-liquid separation chamber (4), a pressure-reducing channel (301), and an installation chamber (302). The adjusting mechanism (7) includes a waterproof motor (701), a lead screw (703), and a piston (706).

2. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 1, characterized in that: The middle section of the air inlet pipe (1) is fixedly connected to a first pressure gauge (5), the middle section of the air outlet pipe (2) is fixedly connected to a second pressure gauge (501), and the bottom of the pressure reducing separation chamber is fixedly connected to a liquid outlet pipe (6).

3. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 2, characterized in that: The waterproof motor (701) is fixedly installed inside the mounting cavity (302). A wire conduit (9) is fixedly connected to the top surface of the waterproof motor (701). A PLC controller (8) is fixedly connected to the end of the wire conduit (9) away from the waterproof motor (701). The PLC controller (8) is fixedly connected to the outer wall of the pressure reducing separation chamber.

4. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 3, characterized in that: In the decompression separation chamber, the gas-liquid separation chamber (4) is located on the outside and the gas-liquid channel (3) is located on the inside. The gas-liquid channel (3) is connected to the inlet pipe (1) and the gas-liquid separation chamber (4) is connected to the outlet pipe (2).

5. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 4, characterized in that: The pressure reducing channel (301) has three layers, with four pressure reducing channels (301) in each layer. The two ends of the pressure reducing channel (301) are connected to the gas-liquid channel (3) and the gas-liquid separation chamber (4), respectively.

6. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 5, characterized in that: The output end of the waterproof motor (701) is fixedly connected to the lead screw (703). A first sealing sleeve (702) is fixedly connected to the side of the waterproof motor (701) near the lead screw (703). The first sealing sleeve (702) is rotatably connected to the output end of the waterproof motor (701). A second sealing sleeve (708) is fixedly connected to the end of the waterproof motor (701) away from the first sealing sleeve (702).

7. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 6, characterized in that: A fixing rod (705) is fixedly connected to the inner side of the air intake pipe (1), and a support shaft (704) is fixedly connected to the middle section of the fixing rod (705). The support shaft (704) is rotatably connected to the end of the lead screw (703) away from the waterproof motor (701).

8. The differential pressure compressor gas lift wellhead pressure reduction device as described in claim 7, characterized in that: The piston (706) is threadedly connected to the lead screw (703), and the piston (706) is slidably connected to the inner wall of the gas-liquid channel (3). Both ends of the fixed rod (705) are fixedly connected to guide rods (707). The ends of the two guide rods (707) away from the fixed rod (705) are fixedly connected to the waterproof motor (701). Both guide rods (707) pass through the piston (706) and are slidably connected to it.

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