Well head gas negative pressure gas production device

Abstract

The utility model discloses a negative-pressure gas production device for well head gas, and belongs to the technical field of natural gas production. A base is included; the two gas production boxes are fixedly mounted on the base; the interior of the gas production box is divided into the suction cavity and the feeding cavity through a partition plate; the air vent is formed between the top of the suction cavity and the top of the feeding cavity; the suction mechanism is mounted on the base, and the suction mechanism is connected with the suction cavity; the liquid discharging mechanism is mounted at the bottom of the feeding cavity, negative pressure and positive pressure are alternately generated for the two suction cavities through the suction mechanisms, so that gas production and gas-liquid separation in the feeding cavity after feeding are performed at the negative pressure, natural gas is discharged at the positive pressure, mixed underground water is discharged through the liquid discharging mechanism, and the purpose of rapidly exploiting and separating the natural gas is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas extraction, and more specifically, to a wellhead gas negative pressure extraction device. Background Art

[0002] The natural gas wellhead pressure will gradually decrease as the amount of gas produced increases. When the natural gas wellhead pressure is lower than or equal to the minimum pressure requirement for ground natural gas gathering and transportation, production cannot continue, so negative pressure suction is required to continue gas production.

[0003] The current negative pressure gas production method uses a negative pressure pump to directly draw gas. The material extracted from the wellhead is often a mixture containing groundwater and natural gas. It is difficult to directly separate the gas alone, and groundwater and natural gas can easily enter equipment such as negative pressure pumps.

[0004] In view of this, we propose a wellhead gas negative pressure gas production device. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] The purpose of the present application is to provide a negative pressure gas extraction device for wellhead gas, which solves the technical problem that the current negative pressure gas extraction method in the above-mentioned background technology directly generates negative pressure gas by suction through a negative pressure pump, and the material extracted from the wellhead is often a mixture containing groundwater and natural gas, and it is difficult to directly separate the gas alone, and groundwater and natural gas are also easy to enter the negative pressure pump and other equipment, thereby achieving a technical effect.

[0007] 2. Technical solution

[0008] The technical solution of the present application provides a wellhead gas negative pressure gas production device, comprising:

[0009] Base;

[0010] Gas collection boxes, two gas collection boxes are fixedly installed on the base;

[0011] A suction chamber and a feed chamber, wherein the gas collection box is separated into a suction chamber and a feed chamber by a partition;

[0012] A vent is provided between the top of the suction chamber and the top of the feed chamber;

[0013] A suction mechanism, wherein the base is provided with a suction mechanism, and the suction mechanism is connected to the suction chamber;

[0014] A drainage mechanism is installed at the bottom of the feed chamber.

[0015] Through the above scheme, negative pressure and positive pressure are alternately generated in the two suction chambers through the suction mechanism, so that gas is extracted from the wellhead under negative pressure, gas and liquid are separated in the feeding chamber after feeding, and natural gas is discharged under positive pressure, and the mixed groundwater is discharged through the drainage mechanism, thereby achieving the purpose of rapid extraction and separation of natural gas.

[0016] Optionally, a feed pipe is fixedly connected between the feed chambers of the two gas collection boxes, and an outlet pipe is fixedly connected between the tops of the suction chambers of the two gas collection boxes, and the feed pipe and the outlet pipe are both three-way pipes: a one-way valve is installed inside the end faces of the feed pipe and the outlet pipe close to the gas collection box, and an L-shaped baffle is fixedly installed on the top of one side of the vent close to the feed chamber, and the height and width of the baffle are both greater than the diameter of the vent.

[0017] Through the above scheme, the feed pipe and the gas outlet pipe are respectively used for feeding natural gas into the wellhead and releasing the separated natural gas, and the baffle prevents mixed groundwater from entering the suction chamber.

[0018] Optionally, the suction mechanism includes a fixed seat, a fixed seat is fixedly installed on the base, a motor is fixedly installed on the fixed seat, the output shaft of the motor passes through the fixed seat and is fixedly installed with a rotating wheel, sealing cylinders are fixedly installed on the bases on both sides of the fixed seat, pistons are slidably clamped in the sealing cylinders, a push-pull rod is fixedly installed between the two pistons, and the push-pull rod slides through the end surface of the sealing cylinder, the ends of the two sealing cylinders away from each other are fixedly sleeved with one end of a connecting pipe, and the other ends of the two connecting pipes are respectively connected to two suction chambers, the edge of the rotating wheel is rotatably connected to one end of the connecting rod through a pin shaft, and the other end of the connecting rod is rotatably connected to the push-pull rod through the pin shaft, the cross-sections of the push-pull rod and the piston are both rectangular structures, and the push-pull rod and the end surface of the sealing cylinder are clearance-matched.

[0019] Through the above scheme, the motor drives the wheel to rotate continuously. When the wheel rotates, the push-pull rod is pushed and pulled by the connecting rod to form a crank-connecting rod structure. The push-pull rod slides back and forth, so that the pistons in the two sealing cylinders move to produce a state of one suction and one expansion. The two suction chambers alternately suck and expand sealing water. When sucking sealing water, negative pressure extracts wellhead gas. When expanding sealing water, the separated natural gas is discharged and collected from the gas outlet pipe, thereby continuously producing gas. The sealing water is used for isolation to prevent the natural gas from entering the sealing cylinder and remaining.

[0020] Optionally, the drainage mechanism includes a drainage pipe, the bottom side wall of the feed chamber is fixedly sleeved with the drainage pipe, the inner wall of the feed chamber at the top of the drainage pipe is fixedly installed with a fixed plate, a sliding rod is slidably penetrated on the fixed plate, a float is fixedly installed on the top of the sliding rod, a sealing plate is fixedly installed on the bottom of the sliding rod, the sealing plate slides and fits the inner wall of the feed chamber, a sealing ring is fixedly installed on the side of the sealing plate close to the inner wall of the feed chamber, and the length and width of the sealing plate are both larger than the diameter of the drainage pipe, a cross plate is fixedly installed on the top of the sealing plate, and the bottom of the sliding rod is fixedly connected to the cross plate.

[0021] Through the above scheme, the bottom of the sliding rod is fixedly connected to the horizontal plate, and the natural gas and groundwater mixture pumped into the wellhead are separated in the feed chamber, and the groundwater falls to the bottom of the feed chamber. When the groundwater level is lower than the float, the sealing plate seals the drainage pipe under gravity to keep the feed chamber sealed, thereby extracting the wellhead gas under negative pressure. When the groundwater level rises above the float, the buoyancy of the float pulls the sealing plate up, and the drainage pipe is exposed to discharge the groundwater, thereby ensuring the gas-liquid separation needs of continuous gas production.

[0022] 3. Beneficial effects

[0023] One or more technical solutions provided in the technical solution of this application have at least the following technical effects or advantages:

[0024] 1. In the present application, the bottom of the suction chamber and the sealing cylinder are filled with sealing water added separately, and the motor drives the rotating wheel to rotate continuously. During the rotation of the rotating wheel, the push-pull rod is pushed and pulled by the connecting rod to form a crank connecting rod structure, and the push-pull rod slides back and forth, so that the pistons in the two sealing cylinders move to produce a state of one suction and one expansion. The two suction chambers alternately suck and expand the sealing water. When the sealing water is sucked, the wellhead gas is extracted by negative pressure. When the sealing water is expanded, the separated natural gas is discharged and collected from the gas outlet pipe, thereby continuously extracting gas, and the natural gas is isolated by the sealing water to prevent it from entering the sealing cylinder and remaining;

[0025] 2. The mixture of natural gas and groundwater pumped into the wellhead is separated in the feed chamber, and the groundwater falls to the bottom of the feed chamber. When the groundwater level is lower than the float, the sealing plate descends under gravity to seal the drainage pipe, keeping the feed chamber sealed, thereby extracting the wellhead gas under negative pressure. When the groundwater level rises above the float, the buoyancy of the float pulls the sealing plate up, exposing the drainage pipe to discharge the groundwater, ensuring the gas-liquid separation needs of continuous gas production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a wellhead gas negative pressure gas production device disclosed in a preferred embodiment of the present application;

[0027] Figure 2 A preferred embodiment of the present application is disclosed Figure 1 The enlarged structural diagram at A in the middle;

[0028] Figure 3 A preferred embodiment of the present application is disclosed Figure 1 The enlarged structural diagram at B in the middle;

[0029] Explanation of the numbers in the figure: 1. Base; 2. Gas sampling box; 3. Suction chamber; 4. Feed chamber; 5. Vent; 6. Suction mechanism; 61. Fixed seat; 62. Motor; 63. Rotor; 64. Sealing cylinder; 65. Piston; 66. Connecting pipe; 67. Push-pull rod; 68. Connecting rod; 7. Drain mechanism; 71. Drain pipe; 72. Fixed plate; 73. Sliding rod; 74. Sealing plate; 75. Float; 8. Feed pipe; 9. Exhaust pipe DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] Reference Figure 1 The embodiment of the present application provides a negative pressure gas production device for wellhead gas, comprising: a base 1; a gas production box 2, two gas production boxes 2 are fixedly installed on the base 1; a suction chamber 3 and a feed chamber 4, the suction chamber 3 and the feed chamber 4 are formed by partitioning the gas production box 2; a vent 5, a vent 5 is opened between the tops of the suction chamber 3 and the feed chamber 4; a suction mechanism 6, a suction mechanism 6 is installed on the base 1, and the suction mechanism 6 is connected to the suction chamber 3; a drainage mechanism 7, a drainage mechanism 7 is installed at the bottom of the feed chamber 4, and negative pressure and positive pressure are alternately generated in the two suction chambers 3 through the suction mechanism 6, so that gas is produced at the wellhead under negative pressure, gas and liquid are separated in the feed chamber 4 after feeding, and natural gas is discharged under positive pressure, and mixed groundwater is discharged through the drainage mechanism 7, so as to achieve the purpose of rapid extraction and separation of natural gas.

[0032] Reference Figure 1 A feed pipe 8 is fixedly connected between the feed chambers 4 of the two gas production boxes 2, and an outlet pipe 9 is fixedly connected between the tops of the suction chambers 3 of the two gas production boxes 2. Both the feed pipe 8 and the outlet pipe 9 are three-way pipes: a one-way valve is installed inside the end surface of the feed pipe 8 and the outlet pipe 9 close to the gas production box 2, and an L-shaped baffle is fixedly installed on the top of the side of the vent 5 close to the feed chamber 4, and the height and width of the baffle are both greater than the diameter of the vent 5. The feed pipe 8 and the outlet pipe 9 are respectively used for feeding natural gas into the wellhead and releasing the separated natural gas, and the baffle prevents mixed groundwater from entering the suction chamber 3.

[0033] Reference Figure 1 and Figure 2The suction mechanism 6 includes a fixed seat 61, a fixed seat 61 is fixedly installed on the base 1, a motor 62 is fixedly installed on the fixed seat 61, an output shaft of the motor 62 passes through the fixed seat 61 and is fixedly installed with a rotating wheel 63, sealing cylinders 64 are fixedly installed on the bases 1 on both sides of the fixed seat 61, pistons 65 are slidably connected in the sealing cylinders 64, a push-pull rod 67 is fixedly installed between the two pistons 65, and the push-pull rod 67 slides through the end surface of the sealing cylinder 64, the ends of the two sealing cylinders 64 that are away from each other are fixedly sleeved with one end of a connecting pipe 66, and the other ends of the two connecting pipes 66 are respectively connected to the two suction chambers 3, the edge of the rotating wheel 63 is rotatably connected to one end of a connecting rod 68 through a pin shaft, and the other end of the connecting rod 68 is rotatably connected to the push-pull rod 67 through a pin shaft, The cross-sections of the pull rod 67 and the piston 65 are both rectangular structures. The push-pull rod 67 and the end face of the sealing cylinder 64 are clearance-fitted. The bottom of the suction chamber 3 and the sealing cylinder 64 are filled with separately added sealing water. The motor 62 drives the impeller 63 to rotate continuously. During the rotation of the impeller 63, the push-pull rod 67 is pushed and pulled by the connecting rod 68 to form a crank-connecting rod structure. The push-pull rod 67 slides back and forth, so that the pistons 65 in the two sealing cylinders 64 move to produce a state of one suction and one expansion. The two suction chambers 3 alternately suck and expand the sealing water. When sucking the sealing water, negative pressure extracts the wellhead gas. When expanding the sealing water, the separated natural gas is discharged and collected from the gas outlet pipe 9, thereby continuously producing gas. The sealing water is used for isolation to prevent the natural gas from entering the sealing cylinder 64 and remaining.

[0034] Reference Figure 1 and Figure 3 The discharge mechanism 7 includes a discharge pipe 71, a discharge pipe 71 is fixedly sleeved on the bottom side wall of the feed chamber 4, a fixed plate 72 is fixedly installed on the inner wall of the feed chamber 4 at the top of the discharge pipe 71, a slide rod 73 is slidably penetrated on the fixed plate 72, a float 75 is fixedly installed on the top of the slide rod 73, a sealing plate 74 is fixedly installed on the bottom of the slide rod 73, the sealing plate 74 slides and fits the inner wall of the feed chamber 4, a sealing ring is fixedly installed on one side of the sealing plate 74 close to the inner wall of the feed chamber 4, and the length and width of the sealing plate 74 are both larger than the diameter of the discharge pipe 71, and the sealing plate A horizontal plate is fixedly installed on the top of 74, and the bottom of the slide bar 73 is fixedly connected to the horizontal plate. The natural gas and groundwater mixture pumped into the wellhead are separated in the feed chamber 4, and the groundwater falls to the bottom of the feed chamber 4. When the groundwater level is lower than the float 75, the sealing plate 74 seals the drainage pipe 71 under the gravity drop, keeping the feed chamber 4 sealed, thereby extracting the wellhead gas under negative pressure. When the groundwater level rises above the float 75, the buoyancy of the float 75 pulls the sealing plate 74 upward, and the drainage pipe 71 is exposed to discharge the groundwater, thereby ensuring the gas-liquid separation needs of continuous gas production.

[0035] Working principle: the bottom of the suction chamber 3 and the sealing cylinder 64 are filled with sealing water added separately, and the motor 62 drives the rotating wheel 63 to rotate continuously. When the rotating wheel 63 rotates, the push-pull rod 67 is pushed and pulled by the connecting rod 68 to form a crank connecting rod structure, and the push-pull rod 67 slides back and forth, so that the pistons 65 in the two sealing cylinders 64 move to produce a state of one suction and one expansion. Then, the two suction chambers 3 alternately suck and expand the sealing water. When sucking the sealing water, the negative pressure extracts the wellhead gas, and when expanding the sealing water, the separated natural gas is discharged and collected from the gas outlet pipe 9, so Continuous gas production is carried out, and the sealing water is used for isolation to prevent natural gas from entering the sealing tube 64 and remaining therein. The natural gas and groundwater mixture drawn into the wellhead are separated in the feed chamber 4, and the groundwater falls to the bottom of the feed chamber 4. When the groundwater level is lower than the float 75, the sealing plate 74 seals the drainage pipe 71 under the gravity drop, and the feed chamber 4 is kept sealed, thereby extracting the wellhead gas under negative pressure. When the groundwater level rises above the float 75, the buoyancy of the float 75 pulls the sealing plate 74 upward, and the drainage pipe 71 is exposed to discharge the groundwater, thereby ensuring the gas-liquid separation needs of continuous gas production.

Claims

1. A negative pressure gas production device for wellhead gas, characterized in that: Include: Base (1); Gas collection boxes (2), two gas collection boxes (2) are fixedly mounted on the base (1); A suction chamber (3) and a feed chamber (4), wherein the gas sampling box (2) is divided into the suction chamber (3) and the feed chamber (4) by a partition; A vent (5), a vent (5) is provided between the top of the suction chamber (3) and the top of the feed chamber (4); A suction mechanism (6), wherein the base (1) is provided with the suction mechanism (6), and the suction mechanism (6) is connected to the suction chamber (3); A liquid discharge mechanism (7), wherein a liquid discharge mechanism (7) is installed at the bottom of the feed chamber (4).

2. A negative pressure gas extraction device for wellhead gas according to claim 1, characterized in that: A feed pipe (8) is fixedly sleeved between the feed chambers (4) of the two gas collection boxes (2), and an outlet pipe (9) is fixedly sleeved between the tops of the suction chambers (3) of the two gas collection boxes (2), and both the feed pipe (8) and the outlet pipe (9) are three-way pipes.

3. A negative pressure gas extraction device for wellhead gas according to claim 2, characterized in that: One-way valves are installed inside the end surfaces of the feed pipe (8) and the gas outlet pipe (9) close to the gas collection box (2), and an L-shaped baffle is fixedly installed on the top of one side of the vent (5) close to the feed chamber (4), and the height and width of the baffle are both greater than the diameter of the vent (5).

4. A negative pressure gas extraction device for wellhead gas according to claim 1, characterized in that: The suction mechanism (6) comprises a fixed seat (61), the base (1) is fixedly mounted with the fixed seat (61), the fixed seat (62) is fixedly mounted with a motor (62), the output shaft of the motor (62) passes through the fixed seat (61) and is fixedly mounted with a rotating wheel (63), the bases (1) on both sides of the fixed seat (61) are fixedly mounted with sealing cylinders (64), pistons (65) are slidably engaged in the sealing cylinders (64), a push-pull rod (67) is fixedly mounted between the two pistons (65), and the push-pull rod (67) slides through the end surface of the sealing cylinder (64), the ends of the two sealing cylinders (64) that are away from each other are fixedly sleeved with one end of a connecting pipe (66), and the other ends of the two connecting pipes (66) are respectively connected to the two suction chambers (3), the edge of the rotating wheel (63) is rotatably connected to one end of a connecting rod (68) through a pin shaft, and the other end of the connecting rod (68) is rotatably connected to the push-pull rod (67) through a pin shaft.

5. A negative pressure gas extraction device for wellhead gas according to claim 4, characterized in that: The cross sections of the push-pull rod (67) and the piston (65) are both rectangular structures, and the push-pull rod (67) and the end surface of the sealing cylinder (64) are clearance-matched.

6. A negative pressure gas extraction device for wellhead gas according to claim 1, characterized in that: The drainage mechanism (7) comprises a drainage pipe (71), the bottom side wall of the feed chamber (4) is fixedly sleeved with the drainage pipe (71), the inner wall of the feed chamber (4) at the top of the drainage pipe (71) is fixedly mounted with a fixed plate (72), a sliding rod (73) is slidably penetrated on the fixed plate (72), a floating ball (75) is fixedly mounted on the top of the sliding rod (73), and a sealing plate (74) is fixedly mounted on the bottom of the sliding rod (73), and the sealing plate (74) is slidably fitted against the inner wall of the feed chamber (4).

7. A negative pressure gas extraction device for wellhead gas according to claim 6, characterized in that: A sealing ring is fixedly installed on one side of the sealing plate (74) close to the inner wall of the feed chamber (4), and the length and width of the sealing plate (74) are both larger than the diameter of the discharge pipe (71). A cross plate is fixedly installed on the top of the sealing plate (74), and the bottom of the sliding rod (73) is fixedly connected to the cross plate.

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