CN111101883A - Underground buffering seating device suitable for horizontal well plunger gas lift and working method thereof - Google Patents
Underground buffering seating device suitable for horizontal well plunger gas lift and working method thereof Download PDFInfo
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- CN111101883A CN111101883A CN201911295750.5A CN201911295750A CN111101883A CN 111101883 A CN111101883 A CN 111101883A CN 201911295750 A CN201911295750 A CN 201911295750A CN 111101883 A CN111101883 A CN 111101883A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000003139 buffering effect Effects 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/001—Noise damping
- F04B53/003—Noise damping by damping supports
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Marine Sciences & Fisheries (AREA)
Abstract
The invention discloses an underground buffering seating device suitable for horizontal well plunger gas lift and a working method thereof, and relates to the field of oil and gas field plunger gas lift drainage gas production. According to the underground buffering and seating device, the fishing head is sleeved on the periphery of the throwing head, the periphery of the lower part of the throwing head is reduced, the mandrel is arranged in a gap between the throwing head and the fishing head, the mandrel and the throwing head are fixed through the throwing lock, and the mandrel extends downwards; a central pipe is sleeved on the periphery of the mandrel, and the head end surface of the central pipe is contacted with the tail end surface of the fishing head; the periphery of the fishing head is provided with a connecting sleeve, a locking block is arranged in a locking block groove in the circumferential direction of the connecting sleeve, the head of the connecting sleeve is provided with a locking cap, the locking cap and the fishing head are fixed through a shear pin, and a semicircular ring is arranged between the end part of the connecting sleeve and the locking cap. The underground buffering seat device suitable for the horizontal well plunger gas lift has the characteristics of lifting seat seal, reverse pressure bearing, buffering and single flow functions. The working method of the invention has convenient operation and high automation.
Description
Technical Field
The invention relates to the field of oil and gas field plunger gas lift drainage and gas production, in particular to an underground buffering seat device suitable for horizontal well plunger gas lift and a working method thereof.
Background
With the continuous development of gas fields, a large number of horizontal gas wells enter a low-pressure and low-yield stage, the yield of a single well is low, the liquid carrying capacity is poor, liquid accumulation is gradually generated at the bottom of the well and in a shaft, the yield of the gas wells is seriously influenced, and effective drainage measures need to be taken urgently. The plunger gas lift is an effective, economical and applicable drainage and gas recovery method for gas fields at home and abroad at present, and has a good application effect on a vertical well, but has the technical problems of large leakage, difficult tool setting and the like in the application of a horizontal well. The underground buffer device arranged at a certain position in the shaft in the plunger gas lift equipment system plays the roles of limiting the position of the plunger, sealing the shaft, flowing gas in a one-way mode and damping the plunger in plunger gas lift drainage and gas production, so that the structural design of the underground buffer device plays a key role in the whole set of plunger gas lift equipment.
The conventional setting device is put in the putting process, downward striking is adopted, and for a horizontal gas well, due to the fact that well deviation is large, downward striking force is small, the setting requirement of the setting device and the releasing requirement of a throwing and fishing tool cannot be met, meanwhile, due to the fact that the setting device is not centered under the action of gravity, a clamp spring and a clamping jaw are difficult to clamp into a preset position, and the setting success rate is low.
Disclosure of Invention
The invention aims to solve the problem that a setting success rate of a horizontal well is low, and provides an underground buffering setting device suitable for horizontal well plunger gas lift and a working method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a downhole buffer landing device suitable for horizontal well plunger gas lift comprises a throwing head, wherein a fishing head is sleeved on the periphery of the throwing head, the periphery of the lower part of the throwing head is reduced, a mandrel is arranged in a gap between the throwing head and the fishing head, the mandrel and the throwing head are fixed through a throwing lock, and the mandrel extends downwards;
a central pipe is sleeved on the periphery of the mandrel, and the head end surface of the central pipe is contacted with the tail end surface of the fishing head;
a connecting sleeve is arranged on the periphery of the fishing head, a locking block is arranged in a locking block groove in the circumferential direction of the connecting sleeve, a locking cap is arranged at the head part of the connecting sleeve, the locking cap and the fishing head are fixed through a shear pin, and a semicircular ring is arranged between the end part of the connecting sleeve and the locking cap;
the tail part of the connecting sleeve is provided with a connecting seat which is sleeved on the periphery of the central tube;
a plurality of rubber cylinders are sleeved on the periphery of the central tube extending downwards, an outer sleeve is sleeved on the tail portion of the mandrel, a lock ring sleeve is arranged on the head portion of the outer sleeve extending to the central tube, and a lock ring is arranged on the periphery of the central tube;
when the locking ring is locked with the locking ring sleeve, the end surface of the locking ring is contacted with the end surface of the rubber barrel;
the tail part of the outer sleeve is connected with the seat barrel, the tail part of the seat barrel is provided with a guide head, a central flow passage of the seat barrel is internally provided with a valve plate, and the seat barrel is also internally provided with a spring and a steel ball;
when the spring is in a natural state, the steel ball is clamped between the spring and the valve plate;
the guiding head is connected with the fishing head through a connecting sleeve.
Furthermore, the device also comprises a buffer spring and a core rod;
the periphery of the core rod is sleeved with a buffer spring, one end of the core rod is connected with the fishing head, and the other end of the core rod is connected with the connecting sleeve.
Furthermore, the fishing rod further comprises an elastic cylindrical pin, and the fishing head is fixed with the core rod through the elastic cylindrical pin.
Furthermore, the connecting sleeve and the connecting seat are fixedly connected by an inner hexagonal conical end fastening screw.
Furthermore, a positioning ring for circumferential positioning is arranged between the connecting sleeve and the connecting seat.
Further, the filter also comprises a spring seat and a filter plate;
the filter plate is arranged on the central flow passage of the seat barrel and is used for filtering liquid passing through the flow passage;
the spring seats are arranged at two ends of the spring and are step-shaped hollow cylinders, the outer diameter of the large cylinder is equal to the inner diameter of the seat cylinder, and the outer diameter of the small cylinder is equal to the inner diameter of the spring.
The working method of the underground buffering and seating device suitable for the horizontal well plunger gas lift comprises the following operations:
1) lifting and setting;
2) carrying out liquid carrying operation;
3) and (5) fishing operation.
Further, the specific process of the lifting and setting operation is as follows:
connecting the throwing head with a throwing and fishing tool;
connecting a throwing and fishing tool with a steel wire tool string and throwing the throwing and fishing tool to a preset position, and then clamping the locking block into the tubing coupling;
lifting the throwing and fishing tool, and driving the core shaft and the outer sleeve to move by the upward movement of the throwing head;
the lock ring sleeve and the lock ring are locked with each other along with the movement of the outer sleeve;
the rubber cylinder is continuously stressed to expand and seal, and the setting device is set and sealed;
the throwing lock is cut off, and the throwing and fishing tool brings out the throwing head.
Further, the method is characterized in that the specific process of the liquid carrying operation comprises the following steps:
when the downstream pressure is high, the plunger piston carries liquid upwards, the steel ball is pressed by the pressure to extrude the spring to be separated from the valve plate seat, and the underground fluid enters the central flow passage through the valve plate seat and flows out through the central flow passage;
when there is no pressure difference, the restoring force of the spring pushes the steel ball to fall back onto the valve plate seat, thereby preventing the fluid from moving downwards through the valve plate seat.
Further, the concrete process of the fishing operation is as follows:
cutting off the fixed shear pin;
butting the fishing tool with the fishing head and then lifting the fishing tool, moving the fishing head upwards, and retracting the locking block in the process of moving the fishing head upwards;
the central pipe moves forward, the pressure of the rubber sleeve is reduced to rebound, and the upper accumulated liquid in the shaft flows back downwards until the fishing is successful.
Compared with the prior art, the invention has the following beneficial effects:
according to the underground buffering seat device suitable for the horizontal well plunger gas lift, the upper-lifting seat seal type seat device is designed according to the characteristics of a horizontal gas well, the seat seal putting process is changed, the lower-striking seat seal is changed into the upper-lifting mechanical forced seat seal, and the elastic block type structural design locking block can extend out and retract along with the movement of the mandrel and the fishing head, so that the positioning of the device is realized, and the stability of the device is strong; whether the steel ball is separated from the valve plate or not determines the on-off of the central flow passage, and because the design of the steel ball only can move upwards, the upward channel is opened only when the pressure below is high, and when no pressure exists, the spring pushes the steel ball until the steel ball is contacted with the valve plate, and the steel ball is reset, so that the liquid is effectively prevented from falling back, the liquid lifting efficiency of the plunger is improved, and the liquid lifting is thorough; whether the contact of the inner wall of the shaft and the rubber sleeve determines whether external fluid can flow back or not, when the fishing head goes upwards, the rubber sleeve shrinks, the liquid can flow back, the fishing difficulty is reduced, the fishing is continuously lifted, and the fishing is successful. The invention discloses an underground buffering seating device suitable for horizontal well plunger gas lift, which is a seating device capable of realizing lifting seating and reverse pressure bearing and having buffering and single-flow functions.
Furthermore, the lower part is provided with a buffer spring which can play a role of buffering the plunger moving from bottom to top and has an upward buffering function.
Furthermore, a positioning ring for circumferential positioning is arranged between the connecting sleeve and the connecting seat and used for positioning during installation.
Further, the filter plate is arranged on the central flow passage of the seat cylinder and used for filtering liquid passing through the flow passage.
The spring seat is arranged in the seat barrel and used for installing the spring and realizing the axial positioning of the spring to avoid the deviation of the spring.
The working method of the underground buffering seat device suitable for the horizontal well plunger gas lift comprises the steps of lifting seat sealing operation, liquid carrying operation and fishing operation; the upward lifting seat sealing operation is the upward lifting mechanical forced seat sealing, and the seat sealing success rate is high; convenient operation and high automation.
Drawings
FIG. 1 is a half sectional view of a downhole buffer landing device adapted for horizontal well plunger gas lift of the present invention;
FIG. 2 is a cross-sectional view of a downhole buffer landing device adapted for horizontal well plunger gas lift of the present invention;
FIG. 3 is a cross-sectional view of the positioning device, the unsealing-sealing device, and the uniflow device of the downhole buffer landing device after disassembly of the present invention;
FIG. 4 is a partial view of the buffer device after the downhole buffer seating device of the present invention is disassembled.
Wherein: 1-a throwing head; 2-fishing the head; 3-fixing the shear pin; 4-semicircular ring; 5-locking the cap; 6-locking block body; 7-a positioning ring; 8-locking the block; 9-a mandrel; 10-putting a lock; 11-a fastening screw at the end of an inner hexagonal cone; 12-a connecting seat; 13-a central tube; 14-a rubber cylinder; 15-a lock ring sleeve; 16-a locking ring; 17-a jacket; 18-a filter plate; 19-a spring; 20-steel balls; 21-Verplate; 22-a cartridge; 23-a guide head; 24-connecting sleeves; 25-a buffer spring; 26-core bar; 27-elastic cylindrical pins; 28-fishing head; 29-guide screw.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a schematic structural diagram of the downhole buffer seat device suitable for the horizontal well plunger gas lift of the present invention, and the downhole buffer seat device suitable for the horizontal well plunger gas lift of the present invention comprises a throwing head 1, a fishing head 2, a fixed shear pin 3, a semicircular ring 4, a lock cap 5, a lock block body 6, a positioning ring 7, a lock block 8, a mandrel 9, a throwing lock 10, an inner hexagonal cone end fastening screw 11, a connecting seat 12, a central tube 13, a rubber cylinder 14, a lock ring sleeve 15, a lock ring 16, an outer sleeve 17, a filter plate 18, a spring 19, a steel ball 20, a valve plate 21, a seat cylinder 22, a guide head 23, a connecting sleeve 24, a buffer spring 25, a core rod 26, an elastic cylindrical pin 27, a fishing head 28 and a guide screw 29; the periphery of the throwing head is sleeved with a fishing head, the periphery of the lower part of the throwing head is reduced, a mandrel is arranged in a gap between the throwing head and the fishing head, the mandrel and the throwing head are fixed through a throwing lock, and the mandrel extends downwards; a central pipe is sleeved on the periphery of the mandrel, and the head end surface of the central pipe is contacted with the tail end surface of the fishing head; a connecting sleeve is arranged on the periphery of the fishing head, a locking block is arranged in a locking block groove in the circumferential direction of the connecting sleeve, a locking cap is arranged at the head part of the connecting sleeve, the locking cap and the fishing head are fixed through a shear pin, and a semicircular ring is arranged between the end part of the connecting sleeve and the locking cap; the tail part of the connecting sleeve is provided with a connecting seat which is sleeved on the periphery of the central tube; a plurality of rubber cylinders are sleeved on the periphery of the central tube extending downwards, an outer sleeve is sleeved on the tail portion of the mandrel, a lock ring sleeve is arranged on the head portion of the outer sleeve extending to the central tube, and a lock ring is arranged on the periphery of the central tube; when the locking ring is locked with the locking ring sleeve, the end surface of the locking ring is contacted with the end surface of the rubber barrel; the tail part of the outer sleeve is connected with the seat barrel, the tail part of the seat barrel is provided with a guide head, a central flow passage of the seat barrel is internally provided with a valve plate, and the seat barrel is also internally provided with a spring and a steel ball; when the spring is in a natural state, the steel ball is clamped between the spring and the valve plate; the guide head is connected with the fishing head through a connecting sleeve; a buffer spring is sleeved on the periphery of the core rod, one end of the core rod is connected with the fishing head, and the other end of the core rod is connected with the connecting sleeve; the fishing head is fixed with the core bar through an elastic cylindrical pin; the connecting sleeve and the connecting seat are fixedly connected by an inner hexagonal cone end fastening screw; a positioning ring for circumferential positioning is arranged between the connecting sleeve and the connecting seat; the filter plate is arranged on the central flow passage of the seat cylinder and is used for filtering liquid passing through the flow passage; the spring seat is arranged in the seat barrel and used for installing the spring.
Referring to fig. 2, fig. 2 is a cross-sectional view of the downhole buffer landing device suitable for horizontal well plunger gas lift of the present invention; the protruding part is a locking piece 18 for positioning the device as a whole.
Referring to fig. 3 and 4, fig. 3 is a sectional view of a positioning device, a unsealing sealing device and a single flow device after the downhole buffer setting device of the invention is disassembled, and fig. 4 is a partial view of the buffer device after the downhole buffer setting device is disassembled; a positioning device: the throwing head 1 is connected with a connecting sleeve 6 through a throwing lock 10, a lock block 8 is put into a lock block groove of the connecting sleeve 6, the connecting sleeve 6 penetrates through the upper core barrel 5 and is inserted into the body 9, a baffle ring 7 is put in, and then the connecting sleeve 6 is in threaded connection with the body 9;
the assembly of the unsealing means is as follows:
connecting and positioning the central tube 13 and the connecting seat 12;
two rubber cylinders 14 are arranged on the outer circle of the central tube 13;
connecting the lock ring 16 with the internal thread of the lock ring sleeve 15;
the mandrel 9 is arranged in an internal thread hole of the outer sleeve 17, the central tube 13 is screwed tightly from the connecting seat 12 to the right end of the locking block body 6 of the positioning device through thread connection, and the central tube is fixed by an internal hexagonal cone end fastening screw, so that the assembly of the unsealing sealing device is completed.
The assembly of the single flow device is as follows:
the valve plate 21 is arranged in the inner hole of the seat cylinder 22, the guide head 23 is arranged, the steel ball 20 is arranged from the left end, and the retainer, the spring 19 and the filter plate 18 are arranged in sequence.
Connecting the seat cylinder 22 of the uniflow device and positioning device assembly with the outer sleeve 17 of the unsealing sealing device piece through threads, and screwing a jackscrew; and inserting the throwing head 1 into the hole of the mandrel 9 from the hole of the fishing head 2 of the positioning device assembly, and riveting and connecting by using a throwing pin 10 to complete the assembly of the setting device.
The assembly of the damping device is as follows:
and (3) inserting a core rod 26 from the hole of the connecting sleeve 24 to the right, sleeving a buffer spring 25 on the excircle of the core rod 26, and screwing the buffer into a fishing head 28 to finish the assembly of the whole buffer.
The construction and working process of the invention is as follows:
(1) put in the DH snubber assembly
The invention finishes the throwing process through steel wire operation, and the concrete operations are as follows:
before throwing, a throwing and fishing tool is connected with the throwing head 1;
when the tool is put in, the steel wire tool string is connected with a throwing and fishing tool and is thrown to a specified position, the device is dragged upwards, after the lock block 8 enters an oil pipe coupling, the lock block is clamped into the oil pipe coupling due to the action of a spring, the throwing head 1 moves upwards by lifting the throwing and fishing tool, the core shaft 9 is driven, the throwing lock 10 is cut off, the outer sleeve 17 moves upwards, the lock ring sleeve 15 and the lock ring 16 are mutually locked, the pulling force of 450KG is lifted to expand and seal the rubber sleeve 14, and the setting device is sealed;
the throwing tool is hit on, the throwing lock 10 is broken, the throwing tool drives the throwing head 1, and the mandrel 9 supports the elastic block 8 at the moment, so that the elastic block cannot retract and is successfully thrown.
(2) Downhole seat device operation
When the downstream pressure of the device is high, the lower plunger piston carries liquid upwards, the steel ball 20 is separated from the valve seat 21, and the underground fluid moves to the upper part of the underground buffer device through the valve seat 20 and the central flow passage of the seat;
the fluid does not move down the wellbore due to the seal of the packing element 14 with the wellbore wall;
the lower plunger piston goes upward to impact the buffer spring 25 to play roles of buffering and limiting;
when no pressure difference exists between the lower part and the upper part of the underground buffering device, the lower buffering falls back, the steel ball 20 falls back to the valve seat 21, and fluid cannot move downwards through the central cavity of the valve seat 21.
(3) Fishing down-hole setting device
The invention finishes salvaging through steel wire operation, and the concrete process is as follows:
the test well steel wire is connected with a fishing tool and is descended to the position of the underground seating device, when the fishing tool is butted with the fishing head 2 and then lifted, the part moves upwards relative to the body, the rubber sleeve 14 rebounds, accumulated liquid above the seating device flows back, the fixed shear pin 3 is cut off, and the elastic block 8 retracts after the fishing head 2 moves upwards; the salvaging difficulty is reduced, the salvaging is successful after the continuous lifting.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The underground buffering and landing device suitable for the horizontal well plunger gas lift is characterized by comprising a throwing head (1), wherein a fishing head (2) is sleeved on the periphery of the throwing head (1), the periphery of the lower part of the throwing head (1) is reduced, a mandrel (9) is arranged in a gap between the throwing head (1) and the fishing head (2), the mandrel (9) and the throwing head (1) are fixed through a throwing lock (10), and the mandrel (9) extends downwards;
a central tube (13) is sleeved on the periphery of the mandrel (9), and the head end face of the central tube (13) is in contact with the tail end face of the fishing head (2);
a connecting sleeve (6) is arranged on the periphery of the fishing head (2), a locking block (8) is arranged in a locking block groove in the circumferential direction of the connecting sleeve (6), a locking cap (5) is arranged at the head part of the connecting sleeve (6), the locking cap (5) and the fishing head (2) are fixed through a shear pin (3), and a semicircular ring (4) is arranged between the end part of the connecting sleeve (6) and the locking cap (5);
the tail part of the connecting sleeve (6) is provided with a connecting seat (12), and the connecting seat (12) is sleeved on the periphery of the central tube (13);
a plurality of rubber cylinders (14) are sleeved on the periphery of a central tube (13) extending downwards, an outer sleeve (17) is sleeved on the tail portion of a mandrel (9), a lock ring sleeve (15) is arranged at the head portion of the outer sleeve (17) extending to the central tube (13), and a lock ring (16) is arranged on the periphery of the central tube (13);
when the locking ring (16) is locked with the locking ring sleeve (15), the end surface of the locking ring (16) is contacted with the end surface of the rubber cylinder (14);
the tail part of the outer sleeve (17) is connected with a seat cylinder (22), a guide head (23) is arranged at the tail part of the seat cylinder (22), a valve plate (21) is arranged in a central flow passage of the seat cylinder (22), and a spring (19) and a steel ball (20) are also arranged in the seat cylinder (22);
when the spring (19) is in a natural state, the steel ball (20) is clamped between the spring (19) and the valve plate (21);
the guide head (23) is connected with the fishing head (28) through a connecting sleeve (24).
2. A downhole buffer landing device suitable for horizontal well plunger gas lift according to claim 1, further comprising a buffer spring (25) and a core rod (26);
the periphery of the core rod (26) is sleeved with a buffer spring (25), one end of the core rod (26) is connected with the fishing head (28), and the other end of the core rod is connected with the connecting sleeve (24).
3. The downhole buffer landing device suitable for the horizontal well plunger gas lift is characterized by further comprising an elastic cylindrical pin (27), wherein the fishing head (28) is fixed with the core rod (26) through the elastic cylindrical pin (27).
4. The underground buffering and seating device suitable for the horizontal well plunger gas lift is characterized in that the connecting sleeve (6) and the connecting seat (12) are fixedly connected through an inner hexagonal cone end fastening screw (11).
5. The downhole buffer landing device suitable for the horizontal well plunger gas lift is characterized in that a positioning ring (7) for circumferential positioning is arranged between the connecting sleeve (6) and the connecting seat (12).
6. A downhole buffer seating device suitable for horizontal well plunger gas lift according to claim 1, further comprising a spring seat and a filter plate (18);
the filter plate (18) is arranged on a central flow passage of the seat cylinder (22) and is used for filtering liquid passing through the flow passage;
the spring seats are arranged at two ends of the spring (19) and are step-shaped hollow cylinders, the outer diameter of the large cylinder is equal to the inner diameter of the seat cylinder (22), and the outer diameter of the small cylinder is equal to the inner diameter of the spring (19).
7. A working method of the downhole buffer landing device suitable for the horizontal well plunger gas lift according to any one of claims 1 to 6, characterized by comprising the following operations:
1) lifting and setting;
2) carrying out liquid carrying operation;
3) and (5) fishing operation.
8. The working method of the downhole buffer seating device suitable for the horizontal well plunger gas lift is characterized in that the specific process of the lifting seating operation is as follows:
the throwing head (1) is connected with a throwing and fishing tool;
connecting a throwing and fishing tool by using a steel wire tool string and throwing the throwing and fishing tool to a preset position, and then clamping the locking block (8) into the tubing coupling;
lifting the throwing and fishing tool, and driving the core shaft (9) and the outer sleeve (17) to move by the upward movement of the throwing head (1);
the lock ring sleeve (15) and the lock ring (16) are locked with each other along with the movement of the outer sleeve (17);
the rubber cylinder (14) is continuously stressed, so that the rubber cylinder expands and seals, and the setting device is set and sealed;
the throwing lock (10) is cut off, and the throwing and fishing tool takes out the throwing head (1).
9. The working method of the downhole buffer landing device suitable for the horizontal well plunger gas lift is characterized in that the specific process of the liquid carrying operation is as follows:
when the downstream pressure is high, the plunger piston carries liquid upwards, the steel ball (20) is pressed by the pressure to extrude the spring (19) to be separated from the valve plate seat (21), and the underground fluid enters the central flow passage through the valve plate seat (20) and flows out through the central flow passage;
when there is no pressure difference, the restoring force of the spring (19) pushes the steel ball (20) to fall back on the valve plate seat (21), thereby preventing the fluid from moving downward through the valve plate seat (21).
10. The working method of the downhole buffer landing device suitable for the horizontal well plunger gas lift is characterized in that the specific process of fishing operation is as follows:
cutting off the fixed shear pin (3);
the fishing tool is butted with the fishing head (2) and then lifted upwards, the fishing head (2) moves upwards, and the locking block (8) retracts in the process that the fishing head (2) moves upwards;
the central pipe (13) moves forwards, the pressure of the rubber sleeve (14) is reduced to rebound, and the accumulated liquid above the shaft flows back downwards until the fishing is successful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295750.5A CN111101883A (en) | 2019-12-16 | 2019-12-16 | Underground buffering seating device suitable for horizontal well plunger gas lift and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295750.5A CN111101883A (en) | 2019-12-16 | 2019-12-16 | Underground buffering seating device suitable for horizontal well plunger gas lift and working method thereof |
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Cited By (2)
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| CN113464091A (en) * | 2021-06-21 | 2021-10-01 | 湖南唯科拓石油科技服务有限公司 | A reaming is instrument of opening by force for in relief valve in pit |
| CN114482887A (en) * | 2020-10-27 | 2022-05-13 | 中国石油天然气股份有限公司 | Throwing and fishing device and method for underground gas lift valve |
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Application publication date: 20200505 |