Hydraulic fracturing constant-pressure blowout device for coal-bed gas well
By designing a hydraulic fracturing constant pressure discharge and spraying device for coalbed methane wells, the combined structure of spring and moving wheels is used to solve the problem of the collision between the pump machine and the well wall, ensuring the normal operation of the pump machine and achieving constant pressure discharge and spraying of the well water, ensuring the high yield and long-term stable production of the coalbed methane well.
Patent Information
- Application Number
- CN202510161422.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2025-05-06
AI Technical Summary
The discharge and spraying speed after hydraulic fracturing of existing coalbed methane wells is unreasonable, resulting in the inability to discharge fine coal powder around the wellbore or the proppant is rebreathed, affecting the high yield and long-term stable production effect of the well. At the same time, the pump is prone to swing and collision with the well wall, resulting in failure.
A coalbed methane gas well hydraulic fracturing constant pressure discharge and spraying device is designed, including a support frame, a first motor, a retracting plate, a connecting rope, a mounting frame, a pump machine, a discharge hose, a fixing plate, a connecting plate, a moving wheel and a first spring. The first spring is squeezed by the moving wheel, and the moving wheel is formed to contact the well wall. The fixing plate limits the fixing frame to ensure that the pump does not swing and isolate it from the well wall.
Effectively prevent the pump from swinging and collision with the well wall, avoid failure, ensure the normal operation of the pump, achieve constant pressure discharge and spraying of the well water, and ensure the high yield and long-term stable production of the coalbed methane well.
Smart Images
Figure CN119933607A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coalbed methane development, and in particular to a coalbed methane well hydraulic fracturing constant pressure blowdown device. Background Art
[0002] For a long time, due to unreasonable control of the blowout rate after hydraulic fracturing of in-situ coalbed methane wells, a large amount of fine coal powder around the wellbore cannot be discharged when the blowout rate is too low, or a large amount of proppant is vomited back when the blowout rate is too high. In order to promote the ground development of coalbed methane, it is necessary to solve the problems of unclear blowout stage, unreasonable blowout rate and no basis for adjusting the blowout rate after hydraulic fracturing of in-situ coalbed methane wells, so as to avoid damage to the conductivity of the fractures around the wellbore caused by the blowout operation, and thereby ensure the high yield and long-term stable production of in-situ coalbed methane wells.
[0003] In order to prevent excessive pressure relief during drainage of coalbed methane wells, which may cause severe disturbance of the gas storage layer at the bottom of the gas well and lead to blockage of the exhaust duct, the water is drained slowly by means of a constant pressure release device until the pressure changes from high pressure to low pressure. When the constant pressure release device is working, the pump is placed in the water well to extract liquid, thereby adjusting the pressure in the coalbed methane well. The discharge speed is adjusted through a needle valve to release the pressure at a constant level. The pump is hoisted into the water well by a pull rope. Since the pump is hoisted by a pull rope, it is easy for the pump to swing during operation. The swinging pump is easy to collide with the wall of the water well, causing the pump to malfunction, thereby affecting the constant pressure release of the well water. Summary of the invention
[0004] The purpose of the present invention is to solve the problem in the prior art that a swinging pump is prone to collide with the well wall, thereby causing pump failure and further affecting the constant pressure release of well water, and to propose a coalbed methane well hydraulic fracturing constant pressure release device.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A constant-pressure blowout device for hydraulic fracturing of a coalbed methane well is designed, comprising a support frame, the upper end of the support frame is fixedly connected to a first motor, the output end of the first motor is fixedly connected to a winding drum, the winding drum is connected to a connecting rope, one end of the connecting rope is fixedly connected to a mounting frame, the mounting frame is fixedly connected to a pump, the outlet end of the pump is connected to a discharge hose, a plurality of fixed plates are connected to the mounting frame at equal intervals along an axial direction, one end of each of the fixed plates is fixedly connected to a connecting plate, one end of each of the connecting plates is connected to a moving wheel, a first spring is fixedly connected to the connecting plate, and one end of the first spring is fixedly connected to the upper end of the fixed plate.
[0006] Preferably, a first connecting rod is fixedly connected to the support frame, one end of the first connecting rod is fixedly connected to a limiting ring, and one end of the discharge hose passes through the limiting ring.
[0007] Preferably, a plurality of mounting grooves are provided on the inner ring wall of the limiting ring at equal intervals along the axis direction, and a ball is rotatably connected in each of the mounting grooves, and the ball is in contact with the discharge hose.
[0008] Preferably, the upper end of the mounting frame is connected to a reversing mechanism for changing the inlet position of the pump, the reversing mechanism includes a second motor, the second motor is fixedly connected to the mounting frame, a connecting shaft is fixedly connected to the output end of the second motor, one end of the connecting shaft passes through the mounting frame and is fixedly connected to a hollow column, the bottom end of the hollow column is connected to a plurality of liquid inlet pipes at equal intervals along the axial direction, a fixed sleeve is rotatably connected to the hollow column, a groove is provided in the fixed sleeve, a through hole is provided on the hollow column, the through hole is connected to the groove, the groove is connected to a connecting pipe, one end of the connecting pipe is connected to the inlet end of the pump.
[0009] Preferably, a plurality of through holes are provided and are evenly spaced along the axis of the hollow column.
[0010] Preferably, the hollow column is connected to a filtering mechanism for preventing the through hole from being blocked, the filtering mechanism includes a fixing ring, the fixing ring is fixedly connected to the hollow column, a protective frame is rotatably connected to the fixing ring, a filter screen is fixedly connected to the protective frame, and the liquid inlet pipe is located inside the protective frame.
[0011] Preferably, a second connecting rod is fixedly connected to the fixing ring, one end of the second connecting rod is fixedly connected to a groove column, a movable block is slidably connected to the groove column, a second spring is fixedly connected inside the groove column, one end of the second spring is fixedly connected to the movable block, an end of the movable block away from the second spring is connected to an arc-shaped protrusion, and the arc-shaped protrusion is in contact with the protective frame.
[0012] The invention provides a coalbed methane well hydraulic fracturing constant pressure blowdown device, which has the following beneficial effects: The first spring is squeezed by the moving wheel through the connecting plate. The elastic force generated by the first spring causes the moving wheel to squeeze the well wall, thereby limiting and fixing the fixed plate. A plurality of fixed plates limit and fix the mounting frame. The mounting frame fixes the pump, so that the pump will not swing during operation, thereby preventing the pump from colliding with the well wall during operation, thereby preventing the pump from malfunctioning due to collision, thereby ensuring the normal operation of the pump and spraying the well water at a constant pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1A structural diagram of a coalbed methane well hydraulic fracturing constant pressure blowdown device proposed by the present invention Figure 1 ; Figure 2 A structural diagram of a coalbed methane well hydraulic fracturing constant pressure blowdown device proposed by the present invention Figure 2 ; Figure 3 This is a structural schematic diagram of the connection between the mounting frame and the fixing plate in a coalbed methane well hydraulic fracturing constant pressure blowdown device proposed by the present invention; Figure 4 This is a structural schematic diagram of the connection between the mounting frame and the pump in a coalbed methane well hydraulic fracturing constant pressure blowdown device proposed by the present invention; Figure 5 This is a structural schematic diagram of the connection between the mounting frame and the reversing mechanism in a coalbed methane well hydraulic fracturing constant pressure blowdown device proposed by the present invention; Figure 6 This is a cross-sectional structural diagram of the connection between the mounting frame and the reversing mechanism in a coalbed methane well hydraulic fracturing constant pressure blowdown device proposed by the present invention; Figure 7 for Figure 6 A schematic diagram of the local enlarged structure at A above; Figure 8 for Figure 6 Schematic diagram of the local enlarged structure at point B above.
[0014] In the figure: 1. support frame; 2. first motor; 3. take-up reel; 4. connecting rope; 5. mounting frame; 6. pump; 7. discharge hose; 8. fixing plate; 9. connecting plate; 10. moving wheel; 11. first spring; 12. first connecting rod; 13. limiting ring; 14. reversing mechanism; 15. filtering mechanism; 141. second motor; 142. connecting shaft; 143. hollow column; 144. liquid inlet pipe; 145. fixing sleeve; 146. groove; 147. through hole; 148. connecting pipe; 151. fixing ring; 152. protective frame; 153. filter screen; 154. second connecting rod; 155. groove column; 156. movable block; 157. second spring. DETAILED DESCRIPTION
[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0016] Example 1: Reference Figure 1-2A coalbed methane well hydraulic fracturing constant pressure release device comprises a support frame 1, the upper end of the support frame 1 is fixedly connected to a first motor 2, the first motor 2 is a servo motor, the output end of the first motor 2 is fixedly connected to a winding disk 3, the winding disk 3 is connected to a connecting rope 4, one end of the connecting rope 4 is fixedly connected to a mounting frame 5, a pump 6 is fixedly connected to the mounting frame 5, the outlet end of the pump 6 is connected to a discharge hose 7, the discharge hose 7 is connected to a needle valve, and a plurality of fixed plates 8 are connected to the mounting frame 5 at equal intervals along the axis direction, and one end of each fixed plate 8 They are all fixedly connected with a connecting plate 9, one end of each connecting plate 9 is connected to a moving wheel 10, a first spring 11 is fixedly connected to the connecting plate 9, one end of the first spring 11 is fixedly connected to the upper end of the fixed plate 8, a first connecting rod 12 is fixedly connected to the support frame 1, one end of the first connecting rod 12 is fixedly connected to a limiting ring 13, one end of the discharge hose 7 passes through the limiting ring 13, a plurality of mounting grooves are provided on the inner ring wall of the limiting ring 13 at equal intervals along the axial direction, a ball is rotatably connected in each mounting groove, and the ball is in contact with the discharge hose 7.
[0017] Working principle: The support frame 1 is fixed on the ground, and the mounting frame 5 is located above the wellhead. After the first motor 2 is powered on and started, it drives the winding drum 3 to rotate clockwise. After the winding drum 3 rotates, the connecting rope 4 is released, and the mounting frame 5 moves downward under its own gravity, thereby straightening the released connecting rope 4. After the mounting frame 5 falls into the well, the well wall contacts the moving wheel 10, and the moving wheel 10 drives the connecting plate 9 to rotate toward the fixed plate 8. After the connecting plate 9 rotates, it squeezes the first spring 11. The first spring 11 generates elastic force after being compressed. The elastic force generated by the first spring 11 pushes the connecting plate 9, and the connecting plate 9 squeezes the well wall through the moving wheel 10, so that the moving wheel 10 always keeps in contact with the well wall, so that the pump 6 will not contact the well wall. As the reel 3 rotates and continuously releases the connecting rope 4, the mounting frame 5 continues to move downward under its own gravity. During the downward movement of the mounting frame 5, the moving wheel 10 rolls and contacts with the well wall. After the mounting frame 5 moves downward, it also drives the pump 6 to move downward. During the downward movement of the pump 6, the discharge hose 7 slides on the limit ring 13. The pump 6 moves downward for a distance and contacts with water. After the pump 6 dives to a certain depth, the reel 3 stops releasing the connecting rope 4. After the pump 6 starts, the liquid in the well is extracted. The extracted liquid is released from the discharge hose 7. The spraying speed is adjusted by the needle valve, so that the water in the wellhead is released at a constant pressure. During the operation of the pump 6, several moving wheels 10 are in rolling contact with the well wall. The moving wheels 10 squeeze the first spring 11 through the connecting plate 9. The elastic force generated by the first spring 11 causes the moving wheels 10 to squeeze the well wall, limit and fix the fixed plate 8, and several fixed plates 8 limit and fix the mounting frame 5. The mounting frame 5 fixes the pump 6, so that the pump 6 will not swing during the operation, so that the pump 6 will not collide with the well wall during the operation, and the pump 6 will not malfunction due to the collision, thereby ensuring the normal operation of the pump 6 and spraying the well water at a constant pressure.
[0018] Embodiment 2: The moving wheel 10 squeezes the first spring 11 through the connecting plate 9. The elastic force generated by the first spring 11 causes the moving wheel 10 to squeeze the well wall, and the fixed plate 8 is limited and fixed. A plurality of fixed plates 8 limit and fix the mounting frame 5. The mounting frame 5 fixes the pump 6, so that the pump 6 does not swing during operation, thereby causing the water inlet of the pump 6 to absorb liquid in a single direction. The water inlet in a single direction will cause the water flow to be unevenly distributed in the well, resulting in uneven distribution of the water flow when entering the pump 6, increasing the risk of cavitation. At the same time, the uneven water flow entering the pump 6 will cause the pump 6 to vibrate during operation, thereby affecting the stability of the pump 6. Refer to Figure 3-7 As another preferred embodiment of the present invention, the difference from Embodiment 1 is that a reversing mechanism 14 for changing the inlet position of the pump 6 is connected to the upper end of the mounting frame 5, and the reversing mechanism 14 includes a second motor 141, which is fixedly connected to the mounting frame 5, and the second motor 141 is a reduction motor. A connecting shaft 142 is fixedly connected to the output end of the second motor 141, and one end of the connecting shaft 142 passes through the mounting frame 5 and is fixedly connected to a hollow column 143. The bottom end of the hollow column 143 is connected to a plurality of liquid inlet pipes 144 at equal intervals along the axial direction. A fixing sleeve 145 is rotatably connected to the hollow column 143, and a groove 146 is provided in the fixing sleeve 145. A through hole 147 is provided on the hollow column 143, and the through hole 147 is connected to the groove 146. A plurality of through holes 147 are provided and are evenly spaced along the axial direction of the hollow column 143. A connecting pipe 148 is connected to the groove 146, and one end of the connecting pipe 148 is connected to the inlet end of the pump 6.
[0019] Working principle: After the second motor 141 is started, it drives the connecting shaft 142 to rotate, the connecting shaft 142 drives the hollow column 143 to rotate, the hollow column 143 drives the liquid inlet pipe 144 to rotate, and during the rotation of the hollow column 143, the groove 146 is always connected to the through hole 147. When the pump 6 starts to extract liquid, the liquid in the well enters the hollow column 143 through the plurality of liquid inlet pipes 144, the liquid in the hollow column 143 enters the groove 146 through the through hole 147, and the liquid in the groove 146 enters the pump 6 through the connecting pipe 148 The pump 6 absorbs the liquid in the well through the liquid inlet pipe 144. When the pump 6 is working, the hollow column 143 drives a plurality of liquid inlet pipes 144 to rotate. The inlet position of the liquid inlet pipe 144 is constantly changing. When absorbing the liquid in the well, the inlet end of the liquid inlet pipe 144 absorbs the liquid in different directions, so that when the liquid inlet pipe 144 absorbs the liquid, the water flow entering the pump 6 is evenly distributed to avoid cavitation. The even water flow entering the pump 6 reduces the vibration generated when the pump 6 is running, and improves the stability of the pump 6 when it is working.
[0020] Embodiment 3: When the liquid is sucked by the rotating liquid inlet tube 144, the sucked liquid merges into the hollow column 143, and the liquid in the hollow column 143 enters the groove 146 through the through hole 147. However, due to the presence of particles and debris in the sucked liquid, the through hole 147 is easily blocked by the debris, thereby affecting the liquid sucking of the liquid by the liquid inlet tube 144. Figure 5-6 and Figure 8 As another preferred embodiment of the present invention, the difference from Embodiment 2 is that a filtering mechanism 15 for preventing the through hole 147 from being blocked is connected to the hollow column 143, and the filtering mechanism 15 includes a fixing ring 151, which is fixedly connected to the hollow column 143, and a protective frame 152 is rotatably connected to the fixing ring 151, and a filter screen 153 is fixedly connected to the protective frame 152, and the liquid inlet pipe 144 is located in the protective frame 152, and a second connecting rod 154 is fixedly connected to the fixing ring 151, and a groove column 155 is fixedly connected to one end of the second connecting rod 154, and a movable block 156 is slidably connected to the groove column 155, and a second spring 157 is fixedly connected in the groove column 155, and one end of the second spring 157 is fixedly connected to the movable block 156, and an arc-shaped protrusion is connected to the end of the movable block 156 away from the second spring 157, and the arc-shaped protrusion contacts the protective frame 152.
[0021] Working principle: When the liquid inlet pipe 144 absorbs the liquid in the well, the protection frame 152 is located outside the liquid inlet pipe 144, and the filter screen 153 is fixed on the protection frame 152 to filter the liquid entering the protection frame 152 to prevent debris from entering the hollow column 143, thereby not blocking the through hole 147 and not affecting the liquid from entering the connecting pipe 148; At the same time, the hollow column 143 rotates and drives the fixed ring 151 to rotate, the fixed ring 151 drives the second connecting rod 154 to rotate, the second connecting rod 154 drives the groove column 155 to rotate, the groove column 155 drives the movable block 156 to rotate, the movable block 156 collides with the protective frame 152 during the rotation process, the movable block 156 gradually retracts into the groove column 155 during the collision, and the movable block 156 squeezes the second spring 157 during the retraction process, and the second spring 157 generates elastic force after being compressed. After the movable block 156 retracts into the groove column 155 for a distance, the movable block 156 is in the protective frame 152 The movable block 156 slides for a distance and then separates from the protective frame 152. After separation from the protective frame 152, the movable block 156 is pushed out and reset under the elastic force of the second spring 157. During the rotation of the hollow column 143, the movable block 156 intermittently collides with the protective frame 152. During the collision between the movable block 156 and the protective frame 152, the impact force generated by the collision pushes the protective frame 152 to rotate around the fixed ring 151, and the fixed ring 151 drives the filter screen 153 to rotate. After the filter screen 153 rotates, debris is prevented from accumulating on the filter screen 153, thereby not affecting the liquid passing through the filter screen 153.
[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A coalbed methane well hydraulic fracturing constant pressure blowdown device, comprising a support frame (1), the upper end of the support frame (1) is fixedly connected to a first motor (2), the output end of the first motor (2) is fixedly connected to a winding reel (3), characterized in that: in: The winding reel (3) is connected to a connecting rope (4), one end of the connecting rope (4) is fixedly connected to a mounting frame (5), the mounting frame (5) is fixedly connected to a pump (6), the outlet end of the pump (6) is connected to a discharge hose (7), a plurality of fixed plates (8) are connected to the mounting frame (5) at equal intervals along the axial direction, one end of each of the fixed plates (8) is fixedly connected to a connecting plate (9), one end of each of the connecting plates (9) is connected to a moving wheel (10), the connecting plate (9) is fixedly connected to a first spring (11), one end of the first spring (11) is fixedly connected to the upper end of the fixed plate (8).
2. The coalbed methane well hydraulic fracturing constant pressure blowdown device according to claim 1, characterized in that: A first connecting rod (12) is fixedly connected to the support frame (1), one end of the first connecting rod (12) is fixedly connected to a limiting ring (13), and one end of the discharge hose (7) passes through the limiting ring (13).
3. The coalbed methane well hydraulic fracturing constant pressure blowdown device according to claim 2, characterized in that: A plurality of installation grooves are provided on the inner ring wall of the limiting ring (13) at equal intervals along the axis direction, and a ball is rotatably connected in each installation groove, and the ball is in contact with the discharge hose (7).
4. The coalbed methane well hydraulic fracturing constant pressure release device according to claim 1, characterized in that: The upper end of the mounting frame (5) is connected to a reversing mechanism (14) for changing the inlet position of the pump (6), the reversing mechanism (14) comprising a second motor (141), the second motor (141) being fixedly connected to the mounting frame (5), a connecting shaft (142) being fixedly connected to the output end of the second motor (141), one end of the connecting shaft (142) passing through the mounting frame (5) and being fixedly connected to a hollow column (143), the hollow column (143) The bottom end is connected to a plurality of liquid inlet pipes (144) at equal intervals along the axis direction; a fixing sleeve (145) is rotatably connected to the hollow column (143); a groove (146) is provided in the fixing sleeve (145); a through hole (147) is provided on the hollow column (143); the through hole (147) is connected to the groove (146); a connecting pipe (148) is connected to the groove (146); one end of the connecting pipe (148) is connected to the inlet end of the pump (6).
5. The coalbed methane well hydraulic fracturing constant pressure blowdown device according to claim 4, characterized in that: A plurality of through holes (147) are provided and are distributed at equal intervals along the axis direction of the hollow column (143).
6. The coalbed methane well hydraulic fracturing constant pressure release device according to claim 5, characterized in that: The hollow column (143) is connected to a filter mechanism (15) for preventing the through hole (147) from being blocked. The filter mechanism (15) comprises a fixing ring (151), the fixing ring (151) is fixedly connected to the hollow column (143), a protection frame (152) is rotatably connected to the fixing ring (151), a filter screen (153) is fixedly connected to the protection frame (152), and the liquid inlet pipe (144) is located inside the protection frame (152).
7. The coalbed methane well hydraulic fracturing constant pressure release device according to claim 6, characterized in that: A second connecting rod (154) is fixedly connected to the fixing ring (151), one end of the second connecting rod (154) is fixedly connected to a groove column (155), a movable block (156) is slidably connected to the groove column (155), a second spring (157) is fixedly connected inside the groove column (155), one end of the second spring (157) is fixedly connected to the movable block (156), and an arc-shaped protrusion is connected to one end of the movable block (156) away from the second spring (157), and the arc-shaped protrusion is in contact with the protective frame (152).