Underground drainage and gas recovery device for gas well
By designing a downhole drainage and gas production device for gas wells and utilizing an inner core structure and injection pipe sealed by a sealing ring, the problem of liquid accumulation in high-water-production gas wells was solved, achieving long-term normal operation and efficient drainage, and reducing maintenance costs.
Patent Information
- Application Number
- CN202422853770.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-22
AI Technical Summary
In the existing technology, it is difficult to effectively drain the accumulated liquid in the wellbore of a gas well under high water production conditions, resulting in reduced gas well productivity. In addition, the existing equipment is easily affected by the complex gas and water quality conditions downhole, resulting in a short equipment maintenance cycle and high operating and maintenance costs.
A downhole drainage and gas production device for a gas well is designed, comprising a working cylinder and an inner core structure. The inner core structure and the working cylinder are sealed by a sealing ring. An injection pipe and a drainage pipe are arranged in the inner core structure. Combined with an anti-scaling pipe and a gas-water separation pipe, the device moves in the power pipe through reverse pressure unsealing and forward and reverse circulation, thereby eliminating attachments on the inner wall of the pipe and improving drainage efficiency.
It has achieved effective drainage and gas production for gas wells with a large water production of 100-200 cubic meters, extended the maintenance cycle of the device, ensured the long-term normal operation of the gas well, prevented gas lock, and improved drainage efficiency.
Smart Images
Figure CN223459366U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of gas field exploitation, in particular to a gas well downhole drainage gas recovery device. BACKGROUND
[0002] With the continuous gas well production time, the gas well productivity gradually reduces, and the bottom hole begins to accumulate liquid when being lower than the critical liquid carrying flow rate, if not taking the liquid discharge measures in time, can make the gas well water flooding even stop production. The commonly used liquid discharge mode in the prior art includes the velocity string, the plunger gas lift drainage gas recovery measure, the compressor gas lift process, the machine pumping, the electric submersible pump drainage gas recovery process and the like, but the velocity string and the plunger gas lift drainage gas recovery measure all utilize the gas well self energy to carry liquid, and the effect is poor for the gas well with water production of more than 100 cubic meters; the compressor gas lift process cannot effectively discharge the wellbore accumulated liquid in the safe lifting pressure range (the field experience generally considers that the safe casing pressure should not be higher than 25MPa); the machine pumping and the electric submersible pump drainage gas recovery process can efficiently discharge the wellbore accumulated liquid by relying on external energy, but are easily affected by the complex downhole gas quality and water quality conditions, the equipment maintenance cycle is short, and the operation and maintenance cost is high.
[0003] In view of the problems existing in the drainage gas recovery process in the prior art, the application provides a gas well downhole drainage gas recovery device. CONTENT OF UTILITY MODEL
[0004] The utility model discloses a gas well downhole drainage gas recovery device, can satisfy 100-200 cubic meters large water production gas well drainage gas recovery, prolongs the device maintenance cycle, guarantees that the device can be in the downhole long time normal operation, ensures the stable production of gas well.
[0005] The utility model discloses the technical scheme that adopts, gas well downhole drainage gas recovery device, including the work cylinder, be provided with the inner core structure in the work cylinder, work cylinder bottom is from top to bottom sequentially provided with the anti -scale pipe, ball seat and gas -water separation pipe;
[0006] The work cylinder includes a work outer cylinder and an inner cylinder arranged concentrically, and a fluid passage is arranged between the work outer cylinder and the inner cylinder.
[0007] The inner core structure includes a sealing locking connector and an inner core connector arranged in the inner cylinder from outside to inside, the sealing locking connector is arranged on the inner wall of the inner cylinder, an oil pipe passage for clamping the oil pipe is arranged between the inner core connector and the sealing locking connector, a jet pipe is arranged in the inner core connector, and a drainage pipe and a nozzle are further arranged at the bottom of the work cylinder, and the nozzle is communicated with the anti-scale pipe, the ball seat and the gas-water separation pipe.
[0008] The utility model has the characteristics that:
[0009] The inner core structure and the inner cylinder are sealed by a sealing ring.
[0010] The oil pipe channel is provided with a limiting clamping groove on the side opposite to the oil pipe.
[0011] The injection pipe comprises, from top to bottom, an injection straight pipe, a first injection guide pipe, a second injection guide pipe and a third injection guide pipe.
[0012] The third injection guide pipe is provided with an injection hole at the bottom.
[0013] The drainage pipe and the airway are both arranged at the bottom of the inner core joint, the drainage pipe comprises a first drainage pipe and a second drainage pipe, the airway and the second drainage pipe are arranged at two sides of the first drainage pipe, the first drainage pipe is arranged at the bottom of the injection hole, the airway, the first drainage pipe and the second drainage pipe are all communicated and communicated with the injection hole.
[0014] The inner core joint is further provided with a communicating hole, the first drainage pipe is communicated with the fluid channel through the communicating hole, the bottom of the second drainage pipe is sealed, the positions of the second drainage pipe and the top of the airway are both higher than the injection hole, the first channel and the second channel communicated with the first drainage pipe are both arc-shaped and the concave surfaces of the arc shapes are oppositely arranged.
[0015] The anti-fouling pipe is fixed between the inner cylinder and the sealing locking joint.
[0016] The ball seat is provided with a ball valve, the ball seat is threadedly connected with the bottom of the working outer cylinder, and the gas-water separation pipe is threadedly connected with the bottom of the ball seat.
[0017] The distance between the inner diameter of the working outer cylinder and the outer diameter of the inner cylinder is 30-40mm, and the outer diameter of the inner cylinder is 40-41mm.
[0018] The gas well downhole drainage gas recovery device has the advantages that: the inner core structure is designed in a split type with the working cylinder, the inner core structure is sealed with the working outer cylinder through a sealing ring, can be unsealed through reverse pressing, and can be moved up and down in the power pipe through positive and reverse circulation, so that the adhesion on the inner wall of the pipe is eliminated; the physical anti-fouling pipe of the working outer cylinder can slow down the device fouling to the greatest extent, and prolong the downhole operation time of the device; the working outer cylinder is provided with a water-gas separation pipe, so that the gas lock can be effectively prevented, and the drainage efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 is a structural schematic view of the gas well downhole drainage gas recovery device;
[0020] Figure 2 is Figure 1 A part of enlarged view in A of Fig.
[0021] Figure 3 is Figure 1 B part of enlarged view in Fig.
[0022] In the figure: 1. working barrel, 1-1. working outer barrel, 1-2. inner barrel; 2. inner core structure, 2-1. sealing locking joint, 2-2. inner core joint, 2-3. oil pipe passage, 2-4. injection pipe, 2-5. drainage pipe, 2-6. nozzle, 2-7. injection straight pipe, 2-8. first injection guide pipe, 2-9. second injection guide pipe, 2-10. third injection guide pipe, 2-11. injection hole, 2-12. first drainage pipe, 2-13. second drainage pipe, 2-14. first passage, 2-15. second passage, 2-16. limiting clamping groove, 2-17. fluid passage, 2-18. communication port; 3. scale prevention pipe, 4. ball seat, 4-1. ball valve, 5. gas-water separation pipe, 6. oil pipe. DETAILED DESCRIPTION
[0023] The utility model will be described in detail below in combination with the drawings and specific embodiments.
[0024] The gas well downhole drainage gas recovery device of the utility model, the structure is as Figure 1 shown, including working barrel 1, the inner core structure 2 is arranged in working barrel 1, and the scale prevention pipe 3, the ball seat 4 and the gas-water separation pipe 5 are sequentially arranged from top to bottom in the bottom of working barrel 1.
[0025] Working barrel 1 includes concentrically arranged working outer barrel 1-1 and inner barrel 1-2, and the fluid passage 2-17 is arranged between working outer barrel 1-1 and inner barrel 1-2; the distance between the inner diameter of working outer barrel 1-1 and the outer diameter of inner barrel 1-2 is 30mm-40mm, that is, the width of the fluid passage 2-17 is 30mm-40mm, and the outer diameter of inner barrel 1-2 is 40mm-41mm.
[0026] The inner core structure 2 includes the sealing locking joint 2-1 and the inner core joint 2-2 sequentially arranged in the inner barrel 1-2 from outside to inside, the sealing locking joint 2-1 is arranged on the inner wall of the inner barrel 1-2, the oil pipe passage 2-3 for clamping the oil pipe 6 is arranged between the inner core joint 2-2 and the sealing locking joint 2-1, the injection pipe 2-4 is arranged in the inner core joint 2-2, the drainage pipe 2-5 and the nozzle 2-6 are further arranged in the bottom of the working barrel 1, and the nozzle 2-6 is communicated with the scale prevention pipe 3, the ball seat 4 and the gas-water separation pipe 5. The working barrel 1 is sent into by downhole operation, the power pipe column adopts the oil pipe 6, and the two are connected and sealed by the sealing locking joint 2-1.
[0027] The inner core structure 2 is sealed with the inner cylinder 1-2 through a sealing ring, can be unsealed through reverse pressing, and can move up and down in the power pipe through positive and reverse circulation to eliminate the adhesion on the inner wall of the pipe.
[0028] As shown in Figure 2 The injection pipe 2-4 includes an injection straight pipe 2-7, a first injection guide pipe 2-8, a second injection guide pipe 2-9 and a third injection guide pipe 2-10 connected in sequence from top to bottom, the longitudinal section of the first injection guide pipe 2-8 is trapezoidal, one end of the first injection guide pipe 2-8 with a large inner diameter size is connected with the injection straight pipe 2-7 and has the same inner diameter size as the injection straight pipe 2-7, the second injection guide pipe 2-9 is a straight pipe, the second injection guide pipe 2-9 is connected with one end of the first injection guide pipe 2-8 with a small inner diameter size and has the same inner diameter as the inner diameter size, the third injection guide pipe 2-10 has a tapered longitudinal section, the bottom surface of the third injection guide pipe 2-10 is connected with the second injection guide pipe 2-9 and has the same inner diameter as the inner diameter of the second injection guide pipe 2-9. The structure of the injection straight pipe 2-7, the first injection guide pipe 2-8, the second injection guide pipe 2-9 and the third injection guide pipe 2-10 with different diameter holes facilitates the increase of the flow rate of the pressurized fluid. The third injection guide pipe 2-10 is provided with an injection hole 2-11 at the bottom. The injection hole 2-11 is a passage for the pressurized fluid.
[0029] The drainage pipe 2-5 and the flow channel 2-6 are both arranged at the bottom of the inner core joint 2-2, the drainage pipe 2-5 includes a first drainage pipe 2-12 and a second drainage pipe 2-13, the flow channel 2-6 and the second drainage pipe 2-13 are arranged on the two sides of the first drainage pipe 2-12 respectively, the first drainage pipe 2-12 is arranged at the bottom of the injection hole 2-11, the flow channel 2-6, the first drainage pipe 2-12 and the second drainage pipe 2-13 are all communicated and communicated with the injection hole 2-11.
[0030] The inner core joint 2-2 is further provided with a communication port 2-18 at the bottom, the first drainage pipe 2-12 is communicated with the fluid passage 2-17 through the communication port 2-18, the bottom of the second drainage pipe 2-13 is sealed, the positions of the second drainage pipe 2-13 and the top end of the flow channel 2-6 are both higher than the injection hole 2-11, the first passage 2-14 and the second passage 2-15 communicated with the first drainage pipe 2-12 are both arc-shaped and the concave surfaces of the arc shapes are oppositely arranged. After the pressurized fluid passes through the injection pipe 2-4, the pressure sharply drops to form a relatively low pressure area, which facilitates the well bottom accumulated liquid to enter the device and mix with the power medium at the flow channel 2-6 to obtain energy and then convert into ascending kinetic energy.
[0031] As shown in Figure 3As shown, the anti-fouling pipe 3 is fixed between the inner cylinder 1-2 and the sealing locking joint 2-1, the setting of the anti-fouling pipe 3 can effectively prolong the fouling time in the device, and ensure that the device can operate normally for a long time. The ball seat 4 is provided with a ball valve 4-1, the ball seat 4 is connected with the bottom of the working outer cylinder 1-1 through threads, and the gas-water separation pipe 5 is connected with the bottom of the ball seat 4 through threads. The setting of the gas-water separation pipe 5 can prevent the device from being gas-locked to the maximum extent, and improve the liquid discharge efficiency.
[0032] The gas well downhole drainage gas recovery device of the utility model will be described below through specific embodiments:
[0033] Example 1:
[0034] The gas well downhole drainage gas recovery device has the structure as Figure 1 shown, which comprises a working cylinder 1, an inner core structure 2 is arranged in the working cylinder 1, and an anti-fouling pipe 3, a ball seat 4 and a gas-water separation pipe 5 are sequentially arranged from top to bottom at the bottom of the working cylinder 1; the working cylinder 1 comprises a working outer cylinder 1-1 and an inner cylinder 1-2 which are concentrically arranged, and a fluid passage 2-17 is arranged between the working outer cylinder 1-1 and the inner cylinder 1-2; the inner core structure 2 comprises a sealing locking joint 2-1 and an inner core joint 2-2 which are sequentially arranged in the inner cylinder 1-2 from outside to inside, the sealing locking joint 2-1 is arranged on the inner wall of the inner cylinder 1-2, an oil pipe passage 2-3 for clamping an oil pipe 6 is arranged between the inner core joint 2-2 and the sealing locking joint 2-1, a jet pipe 2-4 is arranged in the inner core joint 2-2, a drainage pipe 2-5 and a flow channel 2-6 are further arranged at the bottom of the working cylinder 1, and the flow channel 2-6 is communicated with the anti-fouling pipe 3, the ball seat 4 and the gas-water separation pipe 5.
[0035] Example 2:
[0036] The gas well downhole drainage gas recovery device has the structure as Figure 1 shown, which comprises a working cylinder 1, an inner core structure 2 is arranged in the working cylinder 1, and an anti-fouling pipe 3, a ball seat 4 and a gas-water separation pipe 5 are sequentially arranged from top to bottom at the bottom of the working cylinder 1; the working cylinder 1 comprises a working outer cylinder 1-1 and an inner cylinder 1-2 which are concentrically arranged, and a fluid passage 2-17 is arranged between the working outer cylinder 1-1 and the inner cylinder 1-2; the inner core structure 2 comprises a sealing locking joint 2-1 and an inner core joint 2-2 which are sequentially arranged in the inner cylinder 1-2 from outside to inside, the sealing locking joint 2-1 is arranged on the inner wall of the inner cylinder 1-2, an oil pipe passage 2-3 for clamping an oil pipe 6 is arranged between the inner core joint 2-2 and the sealing locking joint 2-1, a jet pipe 2-4 is arranged in the inner core joint 2-2, a drainage pipe 2-5 and a flow channel 2-6 are further arranged at the bottom of the working cylinder 1, and the flow channel 2-6 is communicated with the anti-fouling pipe 3, the ball seat 4 and the gas-water separation pipe 5. The inner core structure 2 and the inner cylinder 1-2 are sealed through a sealing ring. A limiting clamping groove 2-16 is arranged on the side opposite to the oil pipe 6 of the oil pipe passage 2-3.
[0037] Example 3:
[0038] Gas well underground drainage and gas production device, the structure is as follows Figure 1 As shown, it includes a working cylinder 1, an inner core structure 2 is provided in the working cylinder 1, and an anti-scaling tube 3, a ball seat 4 and an air-water separation tube 5 are provided at the bottom of the working cylinder 1 from top to bottom; the working cylinder 1 includes a concentrically arranged working outer cylinder 1-1 and an inner cylinder 1-2, and a fluid channel 2-17 is provided between the working outer cylinder 1-1 and the inner cylinder 1-2; the inner core structure 2 includes a sealing locking joint 2-1 and an inner core joint 2-2 which are arranged in the inner cylinder 1-2 from outside to inside, the sealing locking joint 2-1 is provided on the inner wall of the inner cylinder 1-2, an oil pipe channel 2-3 for inserting the oil pipe 6 is provided between the inner core joint 2-2 and the sealing locking joint 2-1, an injection pipe 2-4 is provided in the inner core joint 2-2, and a drainage pipe 2-5 and a roaring channel 2-6 are also provided at the bottom of the working cylinder 1, and the roaring channel 2-6 is connected to the anti-scaling tube 3, the ball seat 4 and the air-water separation tube 5.
[0039] The injection pipe 2-4 includes, from top to bottom, a straight injection pipe 2-7, a first injection conduit 2-8, a second injection conduit 2-9, and a third injection conduit 2-10, which are connected in sequence. The first injection conduit 2-8 has a trapezoidal longitudinal cross-section. The end with the larger inner diameter of the first injection conduit 2-8 is connected to the straight injection pipe 2-7 and has the same inner diameter as the straight injection pipe 2-7. The second injection conduit 2-9 is a straight pipe and is connected to the end with the smaller inner diameter of the first injection conduit 2-8. The inner diameter of the second injection conduit 2-9 is the same as the inner diameter of the first injection conduit 2-8. The third injection conduit 2-10 has a conical longitudinal cross-section. The bottom surface of the third injection conduit 2-10 is connected to the second injection conduit 2-9 and has the same inner diameter as the second injection conduit 2-9. A spray hole 2-11 is provided at the bottom of the third injection conduit 2-10.
[0040] Example 4:
[0041] Gas well underground drainage and gas production device, the structure is as follows Figure 1 As shown, it includes a working cylinder 1, an inner core structure 2 is provided in the working cylinder 1, and an anti-scaling tube 3, a ball seat 4 and an air-water separation tube 5 are provided at the bottom of the working cylinder 1 from top to bottom; the working cylinder 1 includes a concentrically arranged working outer cylinder 1-1 and an inner cylinder 1-2, and a fluid channel 2-17 is provided between the working outer cylinder 1-1 and the inner cylinder 1-2; the inner core structure 2 includes a sealing locking joint 2-1 and an inner core joint 2-2 which are arranged in the inner cylinder 1-2 from outside to inside, the sealing locking joint 2-1 is provided on the inner wall of the inner cylinder 1-2, an oil pipe channel 2-3 for inserting the oil pipe 6 is provided between the inner core joint 2-2 and the sealing locking joint 2-1, an injection pipe 2-4 is provided in the inner core joint 2-2, and a drainage pipe 2-5 and a roaring channel 2-6 are also provided at the bottom of the working cylinder 1, and the roaring channel 2-6 is connected to the anti-scaling tube 3, the ball seat 4 and the air-water separation tube 5.
[0042] The injection pipe 2-4 comprises, from top to bottom, an injection straight pipe 2-7, a first injection guide pipe 2-8, a second injection guide pipe 2-9 and a third injection guide pipe 2-10 connected in sequence, the first injection guide pipe 2-8 is in the shape of a trapezoid in longitudinal section, the end of the first injection guide pipe 2-8 with a larger inner diameter is connected with the injection straight pipe 2-7 and has the same inner diameter as the injection straight pipe 2-7, the second injection guide pipe 2-9 is a straight pipe, the end of the second injection guide pipe 2-9 with a smaller inner diameter is connected with the first injection guide pipe 2-8 and has the same inner diameter as the first injection guide pipe 2-8, the third injection guide pipe 2-10 is in the shape of a cone in longitudinal section, the bottom surface of the third injection guide pipe 2-10 is connected with the second injection guide pipe 2-9 and has the same inner diameter as the second injection guide pipe 2-9. The third injection guide pipe 2-10 is provided with an injection hole 2-11 at the bottom.
[0043] The drainage pipe 2-5 and the flow passage 2-6 are both arranged at the bottom of the inner core joint 2-2, the drainage pipe 2-5 comprises a first drainage pipe 2-12 and a second drainage pipe 2-13, the flow passage 2-6 and the second drainage pipe 2-13 are arranged at the two sides of the first drainage pipe 2-12 respectively, the first drainage pipe 2-12 is arranged at the bottom of the injection hole 2-11, the top ends of the flow passage 2-6, the first drainage pipe 2-12 and the second drainage pipe 2-13 are all communicated and connected with the injection hole 2-11.
[0044] Example 5:
[0045] The downhole drainage gas recovery device for gas wells has the structure as shown in Figure 1 The downhole drainage gas recovery device for gas wells has the structure as shown in
[0046] The injection pipe 2-4 includes, from top to bottom, a straight injection pipe 2-7, a first injection conduit 2-8, a second injection conduit 2-9, and a third injection conduit 2-10, which are connected in sequence. The first injection conduit 2-8 has a trapezoidal longitudinal cross-section. The end with the larger inner diameter of the first injection conduit 2-8 is connected to the straight injection pipe 2-7 and has the same inner diameter as the straight injection pipe 2-7. The second injection conduit 2-9 is a straight pipe and is connected to the end with the smaller inner diameter of the first injection conduit 2-8. The inner diameter of the second injection conduit 2-9 is the same as the inner diameter of the first injection conduit 2-8. The third injection conduit 2-10 has a conical longitudinal cross-section. The bottom surface of the third injection conduit 2-10 is connected to the second injection conduit 2-9 and has the same inner diameter as the second injection conduit 2-9. A spray hole 2-11 is provided at the bottom of the third injection conduit 2-10.
[0047] The drainage tube 2-5 and the roaring duct 2-6 are both opened at the bottom of the inner core joint 2-2. The drainage tube 2-5 includes a first drainage tube 2-12 and a second drainage tube 2-13. The roaring duct 2-6 and the second drainage tube 2-13 are respectively arranged on both sides of the first drainage tube 2-12. The first drainage tube 2-12 is arranged at the bottom of the injection hole 2-11. The upper ends of the roaring duct 2-6, the first drainage tube 2-12 and the second drainage tube 2-13 are all connected and are all connected to the injection hole 2-11.
[0048] A connecting port 2-18 is also provided at the bottom of the inner core joint 2-2, through which the first drainage tube 2-12 is connected to the fluid channel 2-17, and the bottom of the second drainage tube 2-13 is sealed. The positions of the tops of the second drainage tube 2-13 and the roaring channel 2-6 are higher than the injection hole 2-11, and the first channel 2-14 and the second channel 2-15 connecting the second drainage tube 2-13, the roaring channel 2-6 and the first drainage tube 2-12 are all arc-shaped, and the arc-shaped concave surfaces are arranged opposite to each other.
[0049] Example 6:
[0050] Gas well underground drainage and gas production device, the structure is as follows Figure 1 As shown, it includes a working cylinder 1, an inner core structure 2 is provided in the working cylinder 1, and an anti-scaling tube 3, a ball seat 4 and an air-water separation tube 5 are provided at the bottom of the working cylinder 1 from top to bottom; the working cylinder 1 includes a concentrically arranged working outer cylinder 1-1 and an inner cylinder 1-2, and a fluid channel 2-17 is provided between the working outer cylinder 1-1 and the inner cylinder 1-2; the inner core structure 2 includes a sealing locking joint 2-1 and an inner core joint 2-2 which are arranged in the inner cylinder 1-2 from outside to inside, the sealing locking joint 2-1 is provided on the inner wall of the inner cylinder 1-2, an oil pipe channel 2-3 for inserting the oil pipe 6 is provided between the inner core joint 2-2 and the sealing locking joint 2-1, an injection pipe 2-4 is provided in the inner core joint 2-2, and a drainage pipe 2-5 and a roaring channel 2-6 are also provided at the bottom of the working cylinder 1, and the roaring channel 2-6 is connected to the anti-scaling tube 3, the ball seat 4 and the air-water separation tube 5.
[0051] The injection pipe 2-4 comprises, from top to bottom, an injection straight pipe 2-7, a first injection guide pipe 2-8, a second injection guide pipe 2-9 and a third injection guide pipe 2-10 connected in sequence, the first injection guide pipe 2-8 has a trapezoidal longitudinal section, the end of the first injection guide pipe 2-8 with a larger inner diameter is connected with the injection straight pipe 2-7 and has the same inner diameter as the injection straight pipe 2-7, the second injection guide pipe 2-9 is a straight pipe, the end of the second injection guide pipe 2-9 with a smaller inner diameter is connected with the first injection guide pipe 2-8 and has the same inner diameter as the first injection guide pipe 2-8, the third injection guide pipe 2-10 has a tapered longitudinal section, the bottom surface of the third injection guide pipe 2-10 is connected with the second injection guide pipe 2-9 and has the same inner diameter as the second injection guide pipe 2-9. The third injection guide pipe 2-10 is provided with an injection hole 2-11 at the bottom.
[0052] As shown in Figure 2 , the drainage pipe 2-5 and the airway 2-6 are both arranged at the bottom of the inner core joint 2-2, the drainage pipe 2-5 comprises a first drainage pipe 2-12 and a second drainage pipe 2-13, the airway 2-6 and the second drainage pipe 2-13 are arranged at the two sides of the first drainage pipe 2-12 respectively, the first drainage pipe 2-12 is arranged at the bottom of the injection hole 2-11, the airway 2-6, the first drainage pipe 2-12 and the second drainage pipe 2-13 are all communicated at the upper ends and communicated with the injection hole 2-11. The inner core joint 2-2 is further provided with a communication port 2-18, the first drainage pipe 2-12 is communicated with the fluid channel 2-17 through the communication port 2-18, the bottom of the second drainage pipe 2-13 is sealed, the positions of the second drainage pipe 2-13 and the top end of the airway 2-6 are both higher than the injection hole 2-11, the second drainage pipe 2-13, the airway 2-6, the first channel 2-14 and the second channel 2-15 communicated with the first drainage pipe 2-12 all have an arc shape and the concave surfaces of the arc shapes are arranged oppositely.
[0053] As shown in Figure 3 , the scale prevention pipe 3 is fixed between the inner cylinder 1-2 and the sealing and locking joint 2-1. The ball seat 4 is provided with a ball valve 4-1, the ball seat 4 is threadedly connected with the bottom of the working outer cylinder 1-1, and the gas-water separation pipe 5 is threadedly connected with the bottom of the ball seat 4.
[0054] Example 7:
[0055] The downhole drainage gas recovery device for gas well has the structure as shown in Figure 1As shown, it comprises a working barrel 1, an inner core structure 2 is arranged in the working barrel 1, and a scale prevention pipe 3, a ball seat 4 and a gas-water separation pipe 5 are sequentially arranged from top to bottom at the bottom of the working barrel 1; the working barrel 1 comprises a working outer barrel 1-1 and an inner barrel 1-2 which are concentrically arranged, and a fluid passage 2-17 is arranged between the working outer barrel 1-1 and the inner barrel 1-2; the inner core structure 2 comprises a sealing and locking joint 2-1 and an inner core joint 2-2 which are sequentially arranged in the inner barrel 1-2 from outside to inside, the sealing and locking joint 2-1 is arranged on the inner wall of the inner barrel 1-2, an oil pipe passage 2-3 of a clamping oil pipe 6 is arranged between the sealing and locking joint 2-1 and the inner core joint 2-2, a jet pipe 2-4 is arranged in the inner core joint 2-2, a drainage pipe 2-5 and a blowpipe 2-6 are further arranged at the bottom of the working barrel 1, and the blowpipe 2-6 is communicated with the scale prevention pipe 3, the ball seat 4 and the gas-water separation pipe 5.
[0056] The jet pipe 2-4 comprises a jet straight pipe 2-7, a first jet guide pipe 2-8, a second jet guide pipe 2-9 and a third jet guide pipe 2-10 which are sequentially connected from top to bottom, the first jet guide pipe 2-8 is in trapezoidal shape in longitudinal section, one end of the first jet guide pipe 2-8 with large inner diameter size is connected with the jet straight pipe 2-7 and the size thereof is the same as the inner diameter of the jet straight pipe 2-7, the second jet guide pipe 2-9 is a straight pipe, the second jet guide pipe 2-9 is connected with the other end of the first jet guide pipe 2-8 with small inner diameter size and the inner diameter of the second jet guide pipe 2-9 is the same as the inner diameter size thereof, the third jet guide pipe 2-10 is in conical shape in longitudinal section, the bottom surface of the third jet guide pipe 2-10 is connected with the second jet guide pipe 2-9 and the inner diameter of the bottom surface thereof is the same as the inner diameter of the second jet guide pipe 2-9. The third jet guide pipe 2-10 is provided with a jet hole 2-11 at the bottom thereof.
[0057] As shown in the figure, Figure 2 The drainage pipe 2-5 and the blowpipe 2-6 are both arranged at the bottom of the inner core joint 2-2, the drainage pipe 2-5 comprises a first drainage pipe 2-12 and a second drainage pipe 2-13, the blowpipe 2-6 and the second drainage pipe 2-13 are respectively arranged on the two sides of the first drainage pipe 2-12, the first drainage pipe 2-12 is arranged at the bottom of the jet hole 2-11, the blowpipe 2-6, the first drainage pipe 2-12 and the second drainage pipe 2-13 are all communicated at the upper end thereof and communicated with the jet hole 2-11. The bottom of the inner core joint 2-2 is further provided with a communication port 2-18, the first drainage pipe 2-12 is communicated with the fluid passage 2-17 through the communication port 2-18, the bottom of the second drainage pipe 2-13 is sealed, the positions of the second drainage pipe 2-13 and the top end of the blowpipe 2-6 are both higher than the jet hole 2-11, the first channel 2-14 and the second channel 2-15 which are communicated with the second drainage pipe 2-13, the blowpipe 2-6 and the first drainage pipe 2-12 are both in arc shape and the concave surfaces of the arc shapes are oppositely arranged.
[0058] As shown in the figure, Figure 3As shown, the anti-fouling pipe 3 is fixed between the inner cylinder 1-2 and the sealing lock joint 2-1. The ball seat 4 is provided with a ball valve 4-1, and the ball seat 4 is connected to the bottom of the working outer cylinder 1-1 through threads, and the gas-water separation pipe 5 is connected to the bottom of the ball seat 4 through threads.
[0059] The distance between the inner diameter of the working outer cylinder 1-1 and the outer diameter of the inner cylinder 1-2 is 30mm-40mm; and the outer diameter of the inner cylinder 1-2 is 40mm-41mm.
[0060] The use process of the utility model is as follows:
[0061] Step 1, lower the working outer cylinder
[0062] First, the original well tubing is pulled out, and then the working outer cylinder and the downhole accessories are sent to the designed depth by using the power liquid oil pipe;
[0063] Step 2, lower the power pipe
[0064] Then, the tubing hanger 6 is installed, the sealing lock joint 2-1 is connected to the tubing passage 2-3 by using the tubing 6, the ball is thrown, the tubing 6 is pressed to 25MPa, the pressure is stabilized for 10min, and the pressure drop is less than 0.5MPa to be qualified;
[0065] Step 3, throw the inner core structure 2
[0066] The inner core structure 2 is thrown from the tubing 6, the inner core structure is sent into the working cylinder 1 by using the small displacement positive circulation, the tubing 6 is pressed to 25MPa, the pressure is stabilized for 10min, the pressure drop is less than 0.5MPa to be qualified, and then the inner core structure 2 is pulled out by reverse circulation;
[0067] Step 4, concentric pipe pressure test
[0068] The inner pipe of the concentric pipe is closed, the tubing annulus is pressed to 25MPa, the pressure is stabilized for 10min, and the pressure drop is less than 0.5MPa to be qualified.
[0069] The use principle of the utility model is as follows: the fluid medium is injected into the jet pipe 2-4 by using the pressurizing equipment through the power liquid oil pipe, flows to the nozzle 2-6 through the jet hole 2-11, a low pressure area is formed in the inner core structure 2, the ball valve 4-1 is opened, the fluid medium flows to the well bottom through the ball seat 4, a low pressure area is formed at the well bottom, and the accumulated liquid is discharged to the ground by energy exchange, the accumulated liquid discharge channel is that the accumulated liquid rises to the ball seat 4 through the steam-water separation pipe 5, flows to the first drainage pipe 2-12 and the second drainage pipe 2-13 through the nozzle 2-6, reaches the fluid passage 2-17 arranged between the working outer cylinder 1-1 and the inner cylinder 1-2 through the second drainage pipe 2-13 and the communication port 2-18, and rises to the ground.
Claims
1. A gas well downhole water drainage gas production device, characterized in that, The working barrel (1) is internally provided with an inner core structure (2), and the bottom of the working barrel (1) is sequentially provided, from top to bottom, with an anti-scaling pipe (3), a ball seat (4) and a gas-water separation pipe (5); The working barrel (1) comprises a working outer barrel (1-1) and an inner barrel (1-2) arranged concentrically, and a fluid passage (2-17) is arranged between the working outer barrel (1-1) and the inner barrel (1-2); The inner core structure (2) comprises a sealing locking joint (2-1) and an inner core joint (2-2) arranged in the inner barrel (1-2) from outside to inside, the sealing locking joint (2-1) is arranged on the inner wall of the inner barrel (1-2), an oil pipe passage (2-3) for clamping an oil pipe (6) is arranged between the inner core joint (2-2) and the sealing locking joint (2-1), the inner core joint (2-2) is internally provided with a jet pipe (2-4), and the bottom of the working barrel (1) is further provided with a drainage pipe (2-5) and a blowpipe (2-6), the blowpipe (2-6) is communicated with the anti-scaling pipe (3), the ball seat (4) and the gas-water separation pipe (5).
2. The gas well downhole drainage gas recovery device according to claim 1, characterized in that, The inner core structure (2) and the inner barrel (1-2) are sealed by a sealing ring.
3. The gas well downhole drainage gas recovery device of claim 1, wherein, The side, opposite to the oil pipe (6), of the oil pipe passage (2-3) is provided with a limiting clamping groove (2-16).
4. The gas well downhole gas drainage device according to claim 1, characterized in that, The jet pipe (2-4) comprises, sequentially connected from top to bottom, a jet straight pipe (2-7), a first jet guide pipe (2-8), a second jet guide pipe (2-9) and a third jet guide pipe (2-10), the first jet guide pipe (2-8) has a trapezoidal longitudinal section, one end of the first jet guide pipe (2-8) with a larger inner diameter is connected with the jet straight pipe (2-7) and has the same inner diameter as the jet straight pipe (2-7), the second jet guide pipe (2-9) is a straight pipe, one end of the second jet guide pipe (2-9) with a smaller inner diameter is connected with the first jet guide pipe (2-8) and has the same inner diameter as the first jet guide pipe (2-8), and the third jet guide pipe (2-10) has a tapered longitudinal section, the bottom surface of the third jet guide pipe (2-10) is connected with the second jet guide pipe (2-9) and has the same inner diameter as the second jet guide pipe (2-9).
5. The gas well downhole gas drainage device according to claim 4, characterized in that, The third jet guide pipe (2-10) is provided with a jet hole (2-11) at the bottom.
6. The gas well downhole gas drainage device according to claim 5, characterized in that, The drainage pipe (2-5) and the blowpipe (2-6) are both arranged at the bottom of the inner core joint (2-2), the drainage pipe (2-5) comprises a first drainage pipe (2-12) and a second drainage pipe (2-13), the blowpipe (2-6) and the second drainage pipe (2-13) are arranged on the two sides of the first drainage pipe (2-12) respectively, the first drainage pipe (2-12) is arranged at the bottom of the jet hole (2-11), and the upper ends of the blowpipe (2-6), the first drainage pipe (2-12) and the second drainage pipe (2-13) are communicated and communicated with the jet hole (2-11).
7. The gas well downhole gas drainage device according to claim 6, characterized in that, The inner core joint (2-2) bottom is also provided with a communication port (2-18), the first drainage pipe (2-12) communicates with the fluid channel (2-17) through the communication port (2-18), the second drainage pipe (2-13) bottom is sealed, the second drainage pipe (2-13) and the position of the top end of the nozzle (2-6) are all higher than the jet hole (2-11), the second drainage pipe (2-13), the nozzle (2-6), the first channel (2-14) and the second channel (2-15) communicated with the first drainage pipe (2-12) are all arc-shaped and the concave surfaces of the arc shapes are oppositely arranged.
8. The gas well downhole gas drainage device according to claim 7, characterized in that, The anti-scale pipe (3) is fixed between the inner cylinder (1-2) and the sealing locking joint (2-1).
9. The gas well downhole gas drainage device according to claim 8, characterized in that, The ball seat (4) is provided with a ball valve (4-1), the ball seat (4) is connected with the bottom of the working outer cylinder (1-1) through screw threads, and the gas-water separation pipe (5) is connected with the bottom of the ball seat (4) through screw threads.
10. The gas well downhole gas lift device of any one of claims 1-8, wherein, The distance between the inner diameter of the working outer cylinder (1-1) and the outer diameter of the inner cylinder (1-2) is 30mm-40mm; and the outer diameter of the inner cylinder (1-2) is 40mm-41mm.