A natural gas single well pressurization recovery system

Abstract

The present application relates to a natural gas single-well pressurization recovery system, comprising a natural gas pipeline, the lower end of which can continue to extend laterally to form a transverse extension section, the longitudinal extension portion of the natural gas pipeline being the longitudinal extension section, a negative pressure chamber being provided at a middle position of the longitudinal extension section, a first opening being provided on the longitudinal extension section at a position corresponding to the negative pressure chamber, a plurality of groups of second openings being provided on the side of the transverse extension section, the negative pressure chamber being connected to the first opening, and a driving member being provided on the longitudinal extension section to push the negative pressure chamber downward; the present application has the technical effect of increasing the natural gas collection volume of a single natural gas well.

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. The 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 existing technology, natural gas wells are pressurized by ground boosting devices to increase natural gas production, but this method has limited effect. When the boosting device is too far away from the underground reservoir and the pressure loss in the production pipeline is too large, the natural gas production will decrease or even stop.

[0004] Downhole compressors are a technology used to artificially increase reservoir pressure in gas wells. They inject external energy into natural gas, extending the service life of the well and achieving economic benefits that exceed those of conventional surface-based pressurized production. Existing downhole compressors use a centrifugal compression system structure. Due to its structure, they generally have sidewall intake and tail-end sidewall exhaust. In addition to the axial structure, their internal airflow channels also have radially curved 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 impacts the inner wall of the flow channel at the radial channel. Because natural gas contains liquid droplets and solid particles, the impact of a large amount of natural gas mixture on the inner wall of the airflow channel will cause corrosion to the airflow channel, resulting in a significant reduction in the service life of the compression system. At the same time, due to its structure, the compression effect of existing downhole compressors needs to be improved.

[0005] In view of the above-mentioned related technologies, the inventor believes 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 during natural gas extraction, the present application provides a natural gas single-well pressurization recovery system.

[0007] This application provides a natural gas single well pressurization recovery system, which adopts the following technical solutions:

[0008] 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 laterally extended section, the longitudinally extended part of the natural gas pipeline is the longitudinal extension section, a negative pressure chamber is provided at the middle position of the longitudinal extension section, a first opening is provided on the longitudinal extension section corresponding to the position of the negative pressure chamber, multiple groups of second openings are provided on the side of the laterally extended section, the negative pressure chamber is connected to the first opening, and a driving member for pushing the negative pressure chamber downward is provided on the longitudinal extension section.

[0009] By adopting the above technical solution, 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 lower part of the negative pressure chamber will form positive pressure. Since the longitudinal extension section and the transverse extension section are set 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, the high-pressure airflow part 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.

[0010] 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 plate, and when the semicircular plate contacts the limit block, the semicircular plate is perpendicular to the sliding plate, and a reset component for driving the semicircular plate to rotate parallel to the sliding plate is provided on the sliding plate; there is a cavity inside the sliding plate, and a vacuum pumping component for extracting gas in the negative pressure chamber is provided inside.

[0011] 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 maintained 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.

[0012] Preferably, the reset assembly includes two reset springs, a first fixed groove is provided 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 to the two first fixed grooves, and a second fixed groove is provided 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 to the second fixed groove.

[0013] 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 circulate with each other, making it very convenient to collect natural gas.

[0014] Preferably, the vacuum pump assembly includes a first booster air pump, the air inlets of the first booster air pump are 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.

[0015] 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, one first booster air pump can be used to control the vacuuming work on both sides at the same time, which is simple and convenient to operate.

[0016] Preferably, a filter frame perpendicular to the sliding plate is fixedly connected to the sliding plate, a filter screen is detachably connected to the filter frame, and a sealing rubber ring is fixedly connected around the semicircular plate.

[0017] By adopting the above technical solution and setting up 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.

[0018] 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.

[0019] By adopting the above technical solution, supporting particles are set 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.

[0020] 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.

[0021] Preferably, a grouting pipe is sleeved on the outer side of the longitudinal extension section, a grouting space is left between the longitudinal extension section and the grouting pipe, and a grouting opening is opened on the lower side of the grouting pipe.

[0022] By adopting the above technical solution, a grouting pipe is set up, 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 and inner sides 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 increasing the natural gas production capacity.

[0023] Preferably, a second booster air pump is provided in the longitudinal extension section on the upper side of the sliding plate, an air inlet of the second booster air pump is located on the lower side, and an air outlet of the second booster air pump is located on the upper side.

[0024] 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.

[0025] In summary, the present application includes at least one of the following beneficial technical effects.

[0026] 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 lower part of the negative pressure chamber will form positive pressure. Since the longitudinal extension section and the transverse extension section are set 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, the high-pressure airflow part 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.

[0027] Under normal working conditions, the vacuum assembly will extract the gas in the I-shaped structure cavity 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 expand 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0029] Figure 2 It is a structural schematic diagram highlighting the negative pressure chamber in the embodiment.

[0030] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0031] Explanation of the accompanying drawings: 1. Natural gas pipeline; 11. Longitudinal extension section; 111. First opening; 112. Support particles; 12. Horizontal 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

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] The embodiment of the present application 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 by changing the lower end of the longitudinal extension section 11 to horizontal drilling after reaching a certain position.

[0034] Reference Figure 2 and Figure 3, a 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 opening 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. 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 The pressure chamber 2 moves downward, and at this time the interior of the negative pressure chamber 2 is always maintained in a negative pressure state, while the lower chamber on the lower side of the negative pressure chamber 2 will form a positive pressure, and the rock cracks around the rock transverse extension section 12 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 cracks between the rocks along the first opening 111 and the second opening 121, so that the support particles 112 can enter the cracks for support. 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. 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 chamber 2 through the first opening 111. The negative pressure chamber 2 always maintains a negative pressure state, and more natural gas can be collected at this time.

[0035] 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 opposite inner walls of the longitudinal extension section 11. Sliders are fixedly connected at both ends of the sliding plate 21. The sliders are slidably connected in the sliding grooves to realize the up and down movement of the sliding plate 21. The semicircular plate 22 is divided into two groups, one of which is hinged to the upper end of the sliding plate 21, and the other group is hinged to the lower end of the sliding plate 21. The position of each semicircular plate 22 is fixedly connected with a limiting block 26 at the upper and lower ends of the sliding plate 21 corresponding to the position of each semicircular plate 22. When the semicircular plate 22 rotates and fits on the limiting block 26, each semicircular plate 22 is perpendicular to the sliding plate 21. At this time, the semicircular plate 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 first boost air pump 231 is provided with an air inlet of the first boost air pump 231 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; the sliding plate 21 is provided with a reset assembly 24 for driving the semicircular plate 22 to rotate parallel to the sliding plate 21; the reset assembly 24 includes 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 a first fixing groove 242, and the two ends of one reset spring 241 are respectively fixedly connected to the two first fixing 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 a second fixing groove 243, and the two ends of the other reset spring 241 are respectively fixedly connected to the second fixing 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.

[0036] 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 first 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. 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 reduce 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 blocks 26 under the action of the return 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.

[0037] 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 booster 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 booster air pump 5 is located on the lower side, and the air outlet of the second booster air pump 5 is located on the upper side.

[0038] 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 maintained 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, and the negative pressure chamber 2 starts to Finally, a negative pressure state is maintained, at which time more natural gas can be collected; when the overall structure composed of the sliding plate 21 and the semicircular plate 22 needs to be placed in 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 in 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. 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 reduce 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 return 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.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection 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 portion of the natural gas pipeline (1) is a longitudinal extension section (11), characterized in that: A negative pressure bin (2) is provided at the 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) for pushing the negative pressure bin (2) downward is provided on the longitudinal extension section (11); the negative pressure bin (2) includes a sliding plate (21) and a semicircular plate (22), the sliding plate (21) is longitudinally slidably connected to the longitudinal extension section (11), The sliding plate (21) passes through the center point of the cross section of the longitudinal extension section (11); 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). When the semicircular plates (22) are hinged and opened, they form an I-shape with the sliding plate (21); the upper ends of the sliding plate (21) are fixedly connected with limit blocks (26) for limiting the rotation of the semicircular plates (22). When the semicircular plates (22) contact the limit blocks (26), the semicircular plates (22) are perpendicular to the sliding plate (21). The sliding plate (21) is provided with a reset component (24) for driving the semicircular plates (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.

2. The natural gas single-well pressurization recovery system according to claim 1, characterized in that: The reset assembly (24) includes 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 fixed grooves (242). The two ends of one reset spring (241) are respectively fixedly connected in the two first fixed 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 fixed grooves (243). The two ends of the other reset spring (241) are respectively fixedly connected in the second fixed grooves (243).

3. The natural gas single-well pressurization recovery system according to claim 1, 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).

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

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

6. The natural gas single-well pressurization recovery system according to claim 1, characterized in that: The driving member (3) includes 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).

7. 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 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).

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

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