Natural gas single well pressurization recovery system

Abstract

The natural gas single well pressurization recovery system comprises a natural gas pipeline, the lower end of the natural gas pipeline can transversely and continuously extend to form a transverse extension section, the longitudinal extension part of the natural gas pipeline is a longitudinal extension section, and a negative pressure bin is arranged in the middle of the longitudinal extension section; a first opening is formed in the position, corresponding to the negative pressure bin, of the longitudinal extension section, a plurality of sets of second openings are formed in the side portion of the transverse extension section, the negative pressure bin is connected with the first opening, and a driving piece for pushing the negative pressure bin to move downwards is arranged on the longitudinal extension section; the technical effect that the natural gas collection amount of the natural gas single well is increased is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas collection, and in particular to a natural gas single-well pressurization recovery system. Background Art

[0002] As natural gas extraction progresses, the reservoir pressure in the gas well gradually decreases and the natural gas production will drop rapidly. When the reservoir pressure is too low to overcome the total pressure loss in the production pipeline, the natural gas lacks momentum and cannot be ejected. Liquid will flow out of the formation and accumulate in the well to form a hydraulic column, leading to premature abandonment of the well.

[0003] In the prior art, natural gas wells are pressurized by ground boosters to increase natural gas production, but this method has limited effect. When the booster is too far away from the underground reservoir and the pressure loss in the production pipeline is too large, the natural gas production decreases or even stops.

[0004] Downhole compressors are a technology that artificially increases the reservoir pressure in gas wells. They inject external energy into natural gas, extend the service life of gas wells, and achieve economic benefits that exceed those of conventional surface boosting. Existing downhole compressors are centrifugal compression system structures. Affected by their structure, they generally have side wall intake and tail side wall exhaust. In addition to the axial structural part, their internal air flow channels also have radial bending structures at the inlet and outlet sections. When the natural gas flow passes through, it is affected by the inertial force of the compressed gas and will impact the inner wall of the flow channel at the radial channel. Since natural gas contains droplets and solid particles, the impact of a large amount of natural gas mixture on the inner wall of the air flow channel will cause corrosion to the air flow channel, resulting in a significant decrease in the service life of the compression system. At the same time, affected by its structure, the compression effect of existing downhole compressors needs to be improved.

[0005] With respect to the above-mentioned related technologies, the inventors believe that there are other types of boosting devices that can increase natural gas production. Summary of the invention

[0006] In order to solve the technical problem of insufficient pressure in the natural gas extraction process, the present application provides a natural gas single well pressurization recovery system.

[0007] The present application provides a natural gas single well pressurization recovery system, which adopts the following technical solution: A natural gas single-well pressurization recovery system includes a natural gas pipeline, the lower end of the natural gas pipeline can continue to extend laterally to form a transverse extension section, the longitudinal extension part of the natural gas pipeline is the longitudinal extension section, a negative pressure bin is provided at the middle position of the longitudinal extension section, a first opening is provided on the longitudinal extension section at a position corresponding to the negative pressure bin, a plurality of second openings are provided on the side of the transverse extension section, the negative pressure bin is connected to the first opening, and a driving member for pushing the negative pressure bin to move downward is provided on the longitudinal extension section.

[0008] By adopting the above technical scheme, during the natural gas extraction process, the natural gas pipeline is first extended vertically downward. When it is extended to a certain position, it can be extended horizontally to expand the natural gas extraction surface. This scheme designs a negative pressure chamber, and the side of the negative pressure chamber is connected to the first opening, and the negative pressure chamber is always in a negative pressure state, so that the natural gas overflowing from the first opening can be absorbed. Before extraction, the negative pressure chamber can be controlled to move downward by a driving member. At this time, the negative pressure chamber is always connected to the first opening, and the longitudinal extension section and the transverse extension section at the bottom of the negative pressure chamber will form a positive pressure. Since the longitudinal extension section and the transverse extension section are arranged at an angle, a part of the airflow will enter the rock layer through the second opening of the transverse extension section. After the high pressure expands the gap between the rock layers, part of the high-pressure airflow will flow to the first opening and then return to the negative pressure chamber, indirectly expanding the gap between the rocks and increasing the natural gas production.

[0009] Preferably, the negative pressure chamber includes a sliding plate and a semicircular plate, the sliding plate is longitudinally slidably connected to the longitudinal extension section, and the sliding plate passes through the center point of the cross section of the longitudinal extension section; the semicircular plates are divided into two groups, one group is hinged to the upper end of the sliding plate, and the other group is hinged to the lower end of the sliding plate, and when the semicircular plates are hinged and opened, they form an I-shape with the sliding plate; both ends of the upper end of the sliding plate are fixedly connected with limit blocks for limiting the rotation of the semicircular plates, and when the semicircular plates contact the limit blocks, the semicircular plates are perpendicular to the sliding plate, and a reset component for driving the semicircular plates to rotate parallel to the sliding plate is arranged on the sliding plate; the sliding plate is a cavity, and a vacuum pumping component for extracting gas in the negative pressure chamber is arranged inside.

[0010] By adopting the above technical solution, under normal working conditions, the vacuum assembly will extract the gas in the cavity of the I-shaped structure in real time. At this time, the corresponding structural chamber is always kept in a negative pressure state. At this time, the gap between the rocks can be increased by controlling the flow direction of the airflow, thereby expanding the output. By adopting a hinged semicircular plate, after the gap is expanded, the gas can be released by controlling the vacuum assembly. At this time, the semicircular plate will not be perpendicular to the sliding plate under the action of suction. At this time, the semicircular plate will be expanded under the drive of the reset assembly and will eventually be parallel to the sliding plate. At this time, the overall structure composed of the sliding plate and the semicircular plate will not block the extraction of natural gas. Through the design of this structure, the overall operation becomes simpler and more convenient.

[0011] Preferably, the reset assembly includes two reset springs, a first fixing groove is opened on the upper surface of the two semicircular plates located on the upper side of the sliding plate, and the two ends of one of the reset springs are respectively fixedly connected in the two first fixing grooves, and a second fixing groove is opened on the lower surface of the two semicircular plates located on the lower side of the sliding plate, and the two ends of the other reset spring are respectively fixedly connected in the second fixing groove.

[0012] By adopting the above technical solution and setting a reset spring, when the vacuum assembly no longer performs vacuum extraction, the two semicircular plates located at the upper and lower ends of the sliding plate will move closer to each other under the drive of the reset spring. At this time, the gases on the upper and lower sides of the sliding plate flow with each other, making it very convenient to collect natural gas.

[0013] Preferably, the vacuum pump assembly comprises a first booster air pump, the air inlet of the first booster air pump is located on both sides of the sliding plate, and the outlet of the first booster air pump is located at the upper end of the sliding plate.

[0014] By adopting the above technical solution, the first booster air pump is located in the cavity structure of the sliding plate, and its two air inlets are respectively located on both sides of the sliding plate. At this time, the vacuuming work on both sides can be controlled by using a first booster air pump, which is simple and convenient to operate.

[0015] Preferably, a filter frame perpendicular to the sliding plate is fixedly connected to the sliding plate, a filter net is detachably connected to the filter frame, and a sealing rubber ring is fixedly connected around the semicircular plate.

[0016] By adopting the above technical solution and setting a filter, when the semicircular plate is parallel to the sliding plate under the action of the return spring, the filter can filter some impurities that may be brought out under the strong suction force, thereby improving the quality of natural gas.

[0017] Preferably, support particles are provided in the negative pressure chamber and the transverse extension section, and the support particles can enter into the gaps between the rocks along the first opening and the second opening.

[0018] By adopting the above technical solution, supporting particles are arranged in the negative pressure chamber and the lateral extension section. At this time, the supporting particles can enter the gaps between the rocks through the two openings, thereby expanding and supporting the gaps, so that the natural gas retained in the gaps can flow out, which can effectively increase the natural gas production capacity.

[0019] Preferably, the driving member includes a cylinder, the interior of the longitudinal extension section is fixedly connected to a support frame, the base of the cylinder is fixedly connected to the support frame, the piston rod of the cylinder is fixedly connected to a connecting frame, and the other end of the connecting frame is fixedly connected to the sliding plate.

[0020] Preferably, a grouting pipe is sleeved on the outer side of the longitudinal extension section, a grouting space is reserved between the longitudinal extension section and the grouting pipe, and a grouting opening is opened on the lower side of the grouting pipe.

[0021] By adopting the above technical solution, a grouting pipe is arranged, so that after the longitudinal extension section is drilled into the ground for a certain distance, the grouting pipe is drilled into the ground for a short distance, and then the outer side and the inner side of the grouting pipe are completely solidified and sealed by grouting, which can effectively prevent natural gas from flowing out of the gap on the outside of the grouting pipe, thereby improving the natural gas production capacity.

[0022] Preferably, a second boost air pump is provided in the longitudinal extension section on the upper side of the sliding plate, an air inlet of the second boost air pump is located on the lower side, and an air outlet of the second boost air pump is located on the upper side.

[0023] By adopting the above technical solution and setting up a second booster air pump, the gas pump can be used to boost the pressure of natural gas extraction, which can effectively increase the natural gas production capacity.

[0024] In summary, the present application includes at least one of the following beneficial technical effects.

[0025] During the natural gas extraction process, the natural gas pipeline is first extended vertically downward. When it is extended to a certain position, it can be extended horizontally to expand the natural gas extraction surface. This solution designs a negative pressure chamber. The side of the negative pressure chamber is connected to the first opening, and the negative pressure chamber is always in a negative pressure state, so that the natural gas overflowing from the first opening can be absorbed. Before extraction, the negative pressure chamber can be controlled to move downward by a driving member. At this time, the negative pressure chamber is always connected to the first opening, and the longitudinal extension section and the transverse extension section at the bottom of the negative pressure chamber will form a positive pressure. Since the longitudinal extension section and the transverse extension section are arranged at an angle, a part of the airflow will enter the rock layer through the second opening of the transverse extension section. After the high pressure expands the gap between the rock layers, part of the high-pressure airflow will flow to the first opening and then return to the negative pressure chamber, indirectly expanding the gap between the rocks and increasing the natural gas production.

[0026] Under normal working conditions, the vacuum assembly will extract the gas in the cavity of the I-shaped structure in real time. At this time, the corresponding structural chamber is always kept in a negative pressure state. At this time, the gap between the rocks can be increased by controlling the flow direction of the airflow, thereby expanding the output. By adopting a hinged semicircular plate, after the gap is expanded, the gas can be released by controlling the vacuum assembly. At this time, the semicircular plate will not be perpendicular to the sliding plate under the action of suction. At this time, the semicircular plate will be expanded by the reset assembly and will eventually be parallel to the sliding plate. At this time, the overall structure composed of the sliding plate and the semicircular plate will not block the extraction of natural gas. Through the design of this structure, the overall operation becomes simpler and more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0028] Figure 2 It is a structural schematic diagram highlighting the negative pressure chamber in the embodiment.

[0029] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0030] Explanation of the reference numerals: 1. natural gas pipeline; 11. longitudinal extension section; 111. first opening; 112. supporting particles; 12. transverse extension section; 121. second opening; 2. negative pressure chamber; 21. sliding plate; 22. semicircular plate; 23. vacuum assembly; 231. first booster air pump; 24. reset assembly; 241. reset spring; 242. first fixed groove; 243. second fixed groove; 25. filter frame; 251. filter screen; 26. limit block; 3. driving member; 31. cylinder; 32. support frame; 33. connecting frame; 4. grouting pipe; 5. second booster air pump. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The present application embodiment discloses a natural gas single well pressurization recovery system. Figure 1 A natural gas single well pressurization recovery system includes a natural gas pipeline 1, which includes a longitudinal extension section 11 and a transverse extension section 12. The longitudinal extension section 11 is a pipeline drilled longitudinally downward, and the transverse extension section 12 is produced when the lower end of the longitudinal extension section 11 is changed to horizontal drilling after reaching a certain position.

[0033] Reference Figure 2 and Figure 3A plurality of first openings 111 are provided at the middle position of the longitudinal extension section 11, and a negative pressure chamber 2 is longitudinally slidably connected to the longitudinal extension section 11 at the position of the first openings 111. The length of the negative pressure chamber 2 completely covers the plurality of first openings 111, so that when the negative pressure chamber 2 moves within a certain preset distance range, the interior of the negative pressure chamber 2 is always connected to the first opening 111, and a plurality of second openings 121 are provided on the side of the transverse extension section 12. At this time, the negative pressure chamber 2 divides the entire natural gas pipeline 1 into an upper chamber and a lower chamber, and a driving member 3 is provided on the negative pressure chamber 2 to drive it to move downward. The driving member 3 includes a cylinder 31, and a support frame 32 is fixedly connected to the interior of the longitudinal extension section 11. The base of the cylinder 31 is fixedly connected to the support frame 32, and a connecting frame 33 is fixedly connected to the piston rod of the cylinder 31, and the other end of the connecting frame 33 is fixedly connected to the sliding plate 21; when the piston rod of the cylinder 31 is extended, the negative pressure chamber 2 can be controlled to move downward. The negative pressure bin 2 moves downward, at which time the interior of the negative pressure bin 2 always remains in a negative pressure state, and the lower chamber on the lower side of the negative pressure bin 2 will form a positive pressure, at which time the rock cracks around the transverse extension section 12 of the rock can be expanded, and support particles 112 are provided in the negative pressure bin 2 and the transverse extension section 12, and the support particles 112 can enter into the cracks between the rocks along the first opening 111 and the second opening 121, so that the support particles 112 can enter into the cracks for support, and since there is a certain angle between the longitudinal extension section 11 and the transverse extension section 12, the rock cracks at the corners of the two will be easier to expand, and the closer the rock cracks are to the corners, the more difficult it is to expand, and when the expansion is achieved to a certain extent, the positive pressure in the lower chamber will inject a certain amount of natural gas mixture into the rock cracks from the second opening 121, and then flow into the negative pressure bin 2 through the first opening 111, and the negative pressure bin 2 always maintains a negative pressure state, at which time more natural gas can be collected.

[0034] Reference Figure 2 and Figure 3The negative pressure chamber 2 includes a sliding plate 21 and a semicircular plate 22. The cross section of the natural gas pipeline 1 is circular. The sliding plate 21 is longitudinally arranged and passes through the center of the cross section of the natural gas pipeline 1. Specifically, longitudinal sliding grooves are opened on the inner walls opposite to each other on both sides of the longitudinal extension section 11. Slide blocks are fixedly connected at both ends of the sliding plate 21. The slide blocks are slidably connected in the sliding grooves to realize the up and down movement of the sliding plate 21. The semicircular plates 22 are divided into two groups, one of which is hinged to the upper end of the sliding plate 21, and the other is hinged to the lower end of the sliding plate 21. Limiting blocks 26 are fixedly connected to the positions of each semicircular plate 22 at the upper and lower ends of the sliding plate 21. When the semicircular plates 22 rotate and fit on the limiting blocks 26, each semicircular plate 22 is perpendicular to the sliding plate 21. At this time, the semicircular plates 22 and the sliding plate 21 form two symmetrical closed chambers. A cavity structure is set inside the sliding plate 21. At this time, a vacuum assembly 23 is arranged in the cavity, and the vacuum assembly 23 includes The invention comprises a first boost air pump 231, the air inlets of the first boost air pump 231 are located on both sides of the sliding plate 21, and the outlet of the first boost air pump 231 is located at the upper end of the sliding plate 21; a reset assembly 24 for driving the semicircular plate 22 to rotate parallel to the sliding plate 21 is provided on the sliding plate 21; the reset assembly 24 comprises two reset springs 241, and the upper surfaces of the two semicircular plates 22 located on the upper side of the sliding plate 21 are provided with first fixed grooves 242, wherein the two ends of one reset spring 241 are respectively fixedly connected in the two first fixed grooves 242, and the lower surfaces of the two semicircular plates 22 located on the lower side of the sliding plate 21 are provided with second fixed grooves 243, and the two ends of the other reset spring 241 are respectively fixedly connected in the second fixed groove 243; a filter frame 25 perpendicular to the sliding plate 21 is fixedly connected to the sliding plate 21, and a filter screen 251 is detachably connected to the filter frame 25, and a sealing rubber ring is fixedly connected around the semicircular plate 22.

[0035] When it is necessary to place the integral structure composed of the sliding plate 21 and the semicircular plate 22 into the longitudinal extension section 11, the first booster air pump 231 is first kept in an open state, and then the integral structure composed of the sliding plate 21 and the semicircular plate 22 is placed into the longitudinal extension section 11 little by little until the integral structure composed of the sliding plate 21 and the semicircular plate 22 completely covers the first opening 111, and then the sliding plate 21 is pushed downward by the cylinder 31 to expand the gap between the rocks. When the expansion is completed and natural gas collection is required, the first booster air pump 231 can be used to weaken the extraction of gas, so that a positive pressure is formed in the closed chamber composed of the sliding plate 21 and the semicircular plate 22. At this time, the semicircular plates 22 located on the upper and lower sides of the sliding plate 21 will disengage from the limit blocks 26 under the action of the reset spring 241 and remain parallel to the sliding plate 21. At this time, the semicircular plates 22 will not block the extraction of natural gas.

[0036] Replay Figure 1A grouting pipe 4 is sleeved on the outer side of the longitudinal extension section 11, a grouting space is left between the longitudinal extension section 11 and the grouting pipe 4, and a grouting opening is opened on the lower side of the grouting pipe 4; a second boosting air pump 5 is arranged in the longitudinal extension section 11 on the upper side of the sliding plate 21, the air inlet of the second boosting air pump 5 is located on the lower side, and the air outlet of the second boosting air pump 5 is located on the upper side.

[0037] The working principle is as follows: when the piston rod of the cylinder 31 is extended, the negative pressure chamber 2 can be controlled to move downward. At this time, the interior of the negative pressure chamber 2 is always kept in a negative pressure state, and the lower chamber on the lower side of the negative pressure chamber 2 will form a positive pressure. At this time, the rock gaps around the transverse extension section 12 of the rock can be expanded. Support particles 112 are provided in the negative pressure chamber 2 and the transverse extension section 12. The support particles 112 can enter the gaps between the rocks along the first opening 111 and the second opening 121, so that the support particles 112 can enter the gaps for support. Since there is a certain angle between the longitudinal extension section 11 and the transverse extension section 12, the rock gaps at the corners of the two will be easier to expand. The closer the rock gaps are to the corners, the more difficult it is to expand. When the expansion is achieved to a certain extent, the positive pressure in the lower chamber will inject a certain amount of natural gas mixture into the rock gaps from the second opening 121, and then flow into the negative pressure chamber 2 through the first opening 111. The negative pressure chamber 2 starts Finally, a negative pressure state is maintained, at which time more natural gas can be collected; when it is necessary to place the overall structure composed of the sliding plate 21 and the semicircular plate 22 into the longitudinal extension section 11, the first booster air pump 231 is always kept in an open state. At this time, the overall structure composed of the sliding plate 21 and the semicircular plate 22 is placed into the longitudinal extension section 11 little by little until the overall structure composed of the sliding plate 21 and the semicircular plate 22 completely covers the first opening 111, and then the sliding plate 21 is pushed downward by the cylinder 31 to expand the gap between the rocks. When the expansion is completed and natural gas collection is required, the first booster air pump 231 can be used to weaken the extraction of gas, so that the closed chamber composed of the sliding plate 21 and the semicircular plate 22 forms a positive pressure. At this time, the semicircular plates 22 located on the upper and lower sides of the sliding plate 21 will be separated from the limit block 26 under the action of the reset spring 241 and remain parallel to the sliding plate 21. At this time, the semicircular plate 22 will not block the extraction of natural gas.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A natural gas single well pressurization recovery system, comprising a natural gas pipeline (1), wherein the lower end of the natural gas pipeline (1) can be further extended laterally to form a transverse extension section (12), and the longitudinal extension section of the natural gas pipeline (1) is a longitudinal extension section (11), characterized in that: A negative pressure bin (2) is provided at a middle position of the longitudinal extension section (11), a first opening (111) is provided on the longitudinal extension section (11) at a position corresponding to the negative pressure bin (2), a plurality of second openings (121) are provided on the side of the transverse extension section (12), the negative pressure bin (2) is connected to the first opening (111), and a driving member (3) is provided on the longitudinal extension section (11) for pushing the negative pressure bin (2) to move downward.

2. A natural gas single well pressurization recovery system according to claim 1, characterized in that: The negative pressure chamber (2) comprises a sliding plate (21) and a semicircular plate (22), wherein the sliding plate (21) is longitudinally slidably connected to the longitudinal extension section (11), and the sliding plate (21) passes through the center point of the cross section of the longitudinal extension section (11); the semicircular plates (22) are in two groups, one group being hinged to the upper end of the sliding plate (21), and the other group being hinged to the lower end of the sliding plate (21); when the semicircular plates (22) are hinged and opened, they form an I-shape with the sliding plate (21); the sliding plate (21) is connected to the longitudinal extension section (11) and the semicircular plates (22) are ... The upper ends of the movable plate (21) are fixedly connected with limit blocks (26) for limiting the rotation of the semicircular plate (22); when the semicircular plate (22) contacts the limit blocks (26), the semicircular plate (22) is perpendicular to the sliding plate (21); the sliding plate (21) is provided with a reset component (24) for driving the semicircular plate (22) to rotate parallel to the sliding plate (21); the sliding plate (21) is a cavity, and a vacuum component (23) for extracting gas from the negative pressure chamber (2) is provided inside.

3. A natural gas single well pressurization recovery system according to claim 2, characterized in that: The reset assembly (24) comprises two reset springs (241), the upper surfaces of the two semicircular plates (22) located on the upper side of the sliding plate (21) are provided with first fixing grooves (242), the two ends of one of the reset springs (241) are respectively fixedly connected in the two first fixing grooves (242), the lower surfaces of the two semicircular plates (22) located on the lower side of the sliding plate (21) are provided with second fixing grooves (243), the two ends of the other reset spring (241) are respectively fixedly connected in the second fixing grooves (243).

4. A natural gas single well pressurization recovery system according to claim 2, characterized in that: The vacuum pump assembly (23) comprises a first booster air pump (231), the air inlets of the first booster air pump (231) are located on both sides of the sliding plate (21), and the outlet of the first booster air pump (231) is located at the upper end of the sliding plate (21).

5. The natural gas single well pressurization recovery system according to claim 1, characterized in that: A filter frame (25) perpendicular to the sliding plate (21) is fixedly connected to the sliding plate (21), a filter screen (251) is detachably connected to the filter frame (25), and a sealing rubber ring is fixedly connected around the semicircular plate (22).

6. A natural gas single well pressurization recovery system according to claim 1, characterized in that: Support particles (112) are arranged in the negative pressure chamber (2) and the transverse extension section (12), and the support particles (112) can enter the gaps between rocks along the first opening (111) and the second opening (121).

7. The natural gas single well pressurization recovery system according to claim 1, characterized in that: The driving member (3) comprises a cylinder (31), a support frame (32) is fixedly connected to the interior of the longitudinal extension section (11), a base of the cylinder (31) is fixedly connected to the support frame (32), a connecting frame (33) is fixedly connected to the piston rod of the cylinder (31), and the other end of the connecting frame (33) is fixedly connected to the sliding plate (21).

8. The natural gas single well pressurization recovery system according to claim 1, characterized in that: A grouting pipe (4) is sleeved on the outer side of the longitudinal extension section (11), a grouting space is reserved between the longitudinal extension section (11) and the grouting pipe (4), and a grouting opening is opened on the lower side of the grouting pipe (4).

9. A natural gas single well pressurization recovery system according to claim 1, characterized in that: A second boost air pump (5) is arranged in the longitudinal extension section (11) on the upper side of the sliding plate (21), the air inlet of the second boost air pump (5) is located on the lower side, and the air outlet of the second boost air pump (5) is located on the upper side.

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