CN106854985B - Downhole choke and oil field gas production system - Google Patents
Downhole choke and oil field gas production system Download PDFInfo
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- CN106854985B CN106854985B CN201510898456.9A CN201510898456A CN106854985B CN 106854985 B CN106854985 B CN 106854985B CN 201510898456 A CN201510898456 A CN 201510898456A CN 106854985 B CN106854985 B CN 106854985B
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- sliding cylinder
- sleeve
- falling body
- baffle
- upper sliding
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses an underground restrictor and an oil field gas production system, and belongs to the technical field of oil and gas field gas production. The downhole choke includes: the device comprises a sleeve, an upper sliding cylinder, a lower sliding cylinder, a baffle plate, a spring claw, a first falling body, a second falling body and a lower joint; the top of the sleeve is connected with the oil pipe, the bottom of the sleeve is connected with the lower joint, the lower joint is connected with the oil pipe, and the elastic claw is fixed on the inner wall of the lower joint; the baffle is arranged on the lower end surface of the sleeve, and an orifice is arranged in the baffle; the upper sliding cylinder and the lower sliding cylinder are fixed on the inner wall of the sleeve through shear pins, the diameter of the first falling body is larger than or equal to the inner diameter of the lower sliding cylinder and smaller than the inner diameter of the upper sliding cylinder, and the diameter of the second falling body is larger than or equal to the inner diameter of the upper sliding cylinder. The underground restrictor can work normally when being positioned under ultrahigh pressure, and solves the problem that the underground restrictor is flushed to a wellhead due to slip deformation when the common underground restrictor is positioned in a high-pressure well or cannot be throttled due to deformation of a rubber cylinder under high pressure.
Description
Technical Field
The invention relates to the technical field of oil and gas field gas production, in particular to an underground restrictor and an oil and gas field gas production system.
Background
In the gas production process of the oil and gas field, high-pressure natural gas can be generated, when the high-pressure natural gas flows to a wellhead, the wellhead is low in temperature, the problem that the high-pressure natural gas generates hydrate to block a natural gas pipeline can occur, and in order to solve the problem, the downhole choke can be put into a well, so that the high-pressure natural gas can be depressurized through the choke of the downhole choke.
The outer wall of the current downhole choke is provided with slips and a rubber cylinder, the downhole choke is lowered into the appointed position of the oil pipe by rope operation, the steel wire is lifted up, the slips of the downhole choke are deformed and spread and clamped on the inner wall of the oil pipe, meanwhile, the rubber cylinder is swelled after being compressed, an annular space formed by the outer wall of the downhole choke and the inner wall of the oil pipe is sealed, and high-pressure gas is guaranteed to flow to a wellhead only after passing through the throttling hole.
In carrying out the invention, the inventors have found that the prior art has at least the following problems:
because the downhole choke is sealed to hang in the oil pipe through the slips that struts, when gas pressure is higher in the pit, slips and packing element can warp, destroys the leakproofness between downhole choke and the oil pipe, can't realize the effect of downhole choke.
Disclosure of Invention
To solve the problems of the prior art, embodiments of the present invention provide a downhole choke comprising:
the device comprises a sleeve, an upper sliding cylinder, a lower sliding cylinder, a baffle plate, a spring claw, a first falling body, a second falling body and a lower joint;
the top of the sleeve is connected with an oil pipe, the bottom of the sleeve is connected with one end of the lower joint, the other end of the lower joint is connected with the oil pipe, and the elastic claw is fixed on the inner wall of the lower joint;
the baffle is arranged on the lower end surface of the sleeve, and an orifice is arranged in the baffle;
the upper sliding cylinder and the lower sliding cylinder are fixed on the inner wall of the sleeve through shear pins, the upper sliding cylinder is communicated with the lower sliding cylinder, and one end of the lower sliding cylinder extends out of the sleeve and blocks the baffle to cover the lower end face of the lower sliding cylinder;
the diameter of the first falling body is larger than or equal to the inner diameter of the lower sliding cylinder and smaller than the inner diameter of the upper sliding cylinder, and the diameter of the second falling body is larger than or equal to the inner diameter of the upper sliding cylinder;
when the first falling body is put into the oil pipe, the first falling body falls to the upper port of the lower sliding cylinder to seal the lower sliding cylinder, pressure is applied to the first falling body until the shearing pin is sheared off, the first falling body and the lower sliding cylinder fall out of the sleeve, the spring claw clamps the lower sliding cylinder, the baffle covers the lower end face of the sleeve, and throttling begins;
when the second falling body is put into the oil pipe, the second falling body falls to the upper end face of the upper sliding cylinder to seal the upper sliding cylinder, pressure is applied to the second falling body until the shearing pin is sheared off, one end of the upper sliding cylinder is contacted with one end of the lower sliding cylinder away from the bottom of the well, the other end of the upper sliding cylinder is positioned in the sleeve, the baffle is opened, and the first falling body and the second falling body are lifted to the ground by underground high-pressure gas to stop throttling.
Optionally, the first falling body and the second falling body are in a sphere structure.
Optionally, the baffle is connected with the lower end surface of the sleeve through a torsion spring.
Optionally, the sleeve is provided with four shear pin holes,
two shear pins fix the upper slide on the inner wall of the sleeve through two shear pin holes, and the other two shear pins fix the lower slide on the inner wall of the sleeve through the other two shear pin holes.
Optionally, at least one blocking block is arranged on the end surface of the bottom of the baffle plate, and the at least one blocking block is uniformly distributed around the throttling hole;
the blocking block is used for blocking the first falling body and preventing the first falling body from closing the throttle hole.
Optionally, 3 blocking blocks are arranged on the bottom end face of the baffle, and the 3 blocking blocks are distributed on the bottom end face of the baffle in a triangular shape.
Optionally, the downhole choke further comprises an upper joint, one end of the upper joint is connected with one end of the sleeve through threads, and the other end of the upper joint is connected with the oil pipe through threads.
Optionally, a sealing body is arranged between the outer wall of the sleeve and the inner wall of the upper joint.
Optionally, a sealing body is arranged at the joint of the sleeve and the lower joint.
In another aspect, an embodiment of the present invention provides an oil and gas field gas production system, which includes the downhole choke.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the downhole choke of the invention can be connected with the oil pipe outside the well at first, the connected oil pipe and the downhole choke are simultaneously put into the well, when the choke is started, the first falling body is put into the well, the first falling body seals the sliding cylinder, meanwhile, pressure is applied to the first falling body until a shearing pin between the sliding cylinder and the sleeve is sheared off, the sliding cylinder falls into the elastic claw, the baffle covers the lower end face of the sleeve, and downhole high-pressure air flows to the wellhead through an orifice on the baffle to realize the choke; when the throttling is stopped, the second falling body is put into, the second falling body seals the upper sliding cylinder, meanwhile, pressure is applied to the second falling body until a shearing pin between the upper sliding cylinder and the sleeve is sheared, the upper sliding cylinder slides down until the bottom end face of the upper sliding cylinder is contacted with the top end face of the lower sliding cylinder, at the moment, the top end face of the upper sliding cylinder is positioned in the sleeve, the baffle is opened, the first falling body and the second falling body are lifted to the ground by underground high-pressure gas, and the throttling is stopped. When the underground restrictor is positioned under ultrahigh pressure, the underground restrictor can work normally, and the problem that the underground restrictor is flushed to a wellhead due to slip deformation when the common underground restrictor is positioned in a high-pressure well or cannot be throttled due to rubber cylinder deformation under high pressure is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a downhole choke provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a baffle according to a first embodiment of the present invention;
fig. 3 is a bottom view of a baffle according to an embodiment of the present invention.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
1 a sleeve, 2 an upper sliding cylinder, 3 a lower sliding cylinder,
4 baffles, 41 orifices, 42 slides, 43 stops,
5 spring claw, 6 first falling body, 7 second falling body,
8 lower joint, 9 shear pin, 10O-shaped sealing ring,
11 torsion springs, 12 upper joints, 13 sealing bodies,
chamfering of the upper sliding cylinder, chamfering of the lower sliding cylinder and arc-shaped surface of the baffle plate.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a downhole choke comprising:
the device comprises a sleeve 1, an upper sliding cylinder 2, a lower sliding cylinder 3, a baffle 4, a spring claw 5, a first falling body 6, a second falling body 7 and a lower joint 8;
the top of the sleeve 1 is connected with an oil pipe, the bottom of the sleeve 1 is connected with one end of a lower joint 8, the other end of the lower joint 8 is connected with the oil pipe, and the elastic claw 5 is fixed on the inner wall of the lower joint 8;
the baffle plate 4 is arranged on the lower end surface of the sleeve 1, and an orifice 41 is arranged in the baffle plate 4;
the upper sliding cylinder 2 and the lower sliding cylinder 3 are fixed on the inner wall of the sleeve 1 through shear pins 9, the upper sliding cylinder 2 is communicated with the lower sliding cylinder 3, one end of the lower sliding cylinder 3 extends out of the sleeve 1 and the blocking baffle 4 covers the lower end face of the sleeve 1;
the diameter of the first falling body 6 is larger than or equal to the inner diameter of the lower sliding cylinder 3 and smaller than the inner diameter of the upper sliding cylinder 2, and the diameter of the second falling body 7 is larger than or equal to the inner diameter of the upper sliding cylinder 2;
when the first falling body 6 is put into the oil pipe, the first falling body 6 falls to the upper port of the lower sliding cylinder 3 to seal the lower sliding cylinder 3, pressure is applied to the first falling body 6 until the shearing pin 9 is sheared, the first falling body 6 and the lower sliding cylinder 3 fall out of the sleeve 1, the spring claw 5 clamps the lower sliding cylinder 3, the baffle 4 covers the lower end face of the sleeve 1, and throttling begins;
when the second falling body 7 is put into the oil pipe, the second falling body 7 falls to the upper end face of the upper sliding cylinder 2 to seal the upper sliding cylinder 2, pressure is applied to the second falling body 7 until the shearing pin 9 is sheared, one end of the upper sliding cylinder 2 is contacted with one end, far away from the bottom of the well, of the lower sliding cylinder 3, the other end of the upper sliding cylinder 2 is positioned in the sleeve 1, the baffle 4 is opened, the first falling body 6 and the second falling body 7 are lifted to the ground by underground high-pressure gas, and throttling is stopped.
In the embodiment of the invention, two ends of an underground throttle are connected with an oil pipe outside a well, the oil pipe and the underground throttle which are connected together are simultaneously put into the well, when the throttle starts, a first falling body 6 is put into, the first falling body 6 seals a sliding cylinder 3, meanwhile, pressure is applied to the first falling body 6 until a shearing pin 9 between the sliding cylinder 3 and a sleeve 1 is sheared off, the sliding cylinder 3 falls into a spring claw 5, a baffle 4 covers the lower end face of the sleeve 1 at the moment, and underground high-pressure air flows to a wellhead through an orifice 41 on the baffle 4 to realize the throttle; when the throttling is stopped, the second falling body 7 is put into, the second falling body 7 seals the upper sliding cylinder 2, meanwhile, pressure is applied to the second falling body 7 until a shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 is sheared, the upper sliding cylinder 2 slides down until the bottom end face of the upper sliding cylinder 2 is contacted with the top end face of the lower sliding cylinder 3, at the moment, the top end face of the upper sliding cylinder 2 is positioned in the sleeve 1, the baffle plate 4 is opened, the first falling body 6 and the second falling body 7 are lifted to the ground by underground high-pressure gas, and the throttling is stopped. When the underground restrictor is positioned under ultrahigh pressure, the underground restrictor can work normally, and the problem that the underground restrictor is flushed to a wellhead due to slip deformation when the common underground restrictor is positioned in a high-pressure well or cannot be throttled due to rubber cylinder deformation under high pressure is solved.
As shown in fig. 1, when the throttling starts, the first falling body 6 seals the lower sliding cylinder 3, a liquid column with a certain height can be injected above the first falling body 6, pressure is applied to the liquid column through the pump body, so that a shearing pin 9 between the lower sliding cylinder 3 and the sleeve 1 is sheared, after the shearing pin 9 is sheared, the first falling body 6 and the lower sliding cylinder 3 slide downwards outside the sleeve 1, the elastic claw 5 clamps the lower sliding cylinder 3, when the throttling stops, the second falling body 7 seals the upper sliding cylinder 2, a liquid column with a certain height can be injected above the second falling body 7, pressure is applied to the liquid column through the pump body, so that a shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 is sheared, after the shearing pin 9 is sheared, the upper sliding cylinder 2 slides downwards until the bottom end face of the lower sliding cylinder 3 is contacted with the bottom end face of the upper sliding cylinder 2, the top end face of the upper sliding cylinder 2 is positioned in the sleeve 1, the baffle 4 is opened, the downhole high-pressure gas lifts the first falling body 6 and the second falling body 7 to a wellhead, and the throttling stops.
Optionally, the first falling body 6 and the second falling body 7 are of a sphere structure.
The diameter of the sphere of the first falling body 6 is larger than or equal to the inner diameter of the lower sliding cylinder 3 and smaller than the inner diameter of the upper sliding cylinder 2, wherein the diameter of the sphere of the first falling body 6 is set smaller than the inner diameter of the upper sliding cylinder 2, so that the first falling body 6 can smoothly pass through the upper sliding cylinder 2 when being thrown into the first falling body 6, the first falling body 6 is prevented from being blocked in the upper sliding cylinder 2, the diameter of the first falling body 6 is set larger than or equal to the inner diameter of the lower sliding cylinder 3 and smaller than the inner diameter of the upper sliding cylinder 2, the first falling body 6 can be ensured to seal the lower sliding cylinder 3, and the shearing pin 9 between the lower sliding cylinder 3 and the sleeve 1 can be sheared when pressure is applied to the first falling body 6;
the diameter of the sphere of the second falling body 7 is larger than or equal to the inner diameter of the upper sliding cylinder 2, wherein the diameter of the sphere of the second falling body 7 is set to be larger than or equal to the inner diameter of the upper sliding cylinder 2, so that the second falling body 7 can be ensured to seal the upper sliding cylinder 2, and the shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 can be sheared when pressure is applied to the second falling body 7.
Optionally, as shown in fig. 1, the inner diameter of the top of the upper sliding cylinder 2 is provided with a chamfer a, so that the second falling body 7 can be better matched with the upper sliding cylinder 2 by arranging the chamfer a on the inner diameter of the top of the upper sliding cylinder 2, the tightness is improved, and the shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 can be sheared when pressure is applied to the second falling body 7.
Optionally, as shown in fig. 1, an O-ring 10 is arranged between the outer wall of the upper sliding cylinder 2 and the inner wall of the sleeve 1, and the O-ring 10 can improve the tightness between the upper sliding cylinder 2 and the sleeve 1, so that when pressure is applied to the second falling body 7, the shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 can be sheared.
Optionally, as shown in fig. 1, the inner diameter of the top of the sliding cylinder 3 is provided with a chamfer B, so that the first falling body 6 and the sliding cylinder 3 can be better matched by arranging the chamfer B on the inner diameter of the top of the sliding cylinder 3, the tightness is improved, and the shearing pin 9 between the sliding cylinder 3 and the sleeve 1 can be sheared when pressure is applied to the first falling body 6.
Optionally, as shown in fig. 1, an O-ring 10 is arranged between the outer wall of the lower sliding cylinder 3 and the inner wall of the sleeve 1, and the O-ring 10 can improve the tightness between the upper sliding cylinder 2 and the sleeve 1, so that when pressure is applied to the first falling body 6, the shearing pin 9 between the lower sliding cylinder 3 and the sleeve 1 can be sheared.
The number of O-rings 10 may be selected according to the actual situation.
Optionally, the sleeve 1 is provided with four shear pin holes,
as shown in fig. 1, two shear pins 9 fix the upper slide 2 to the inner wall of the sleeve 1 through two of the shear pin holes, and the other two shear pins 9 fix the lower slide 3 to the inner wall of the sleeve 1 through the other two shear pin 9 holes.
The number of shear pins 9 may be selected according to the actual situation, and is not limited to the number listed in the present embodiment.
Alternatively, as shown in fig. 1, the baffle 4 is connected to the lower end surface of the sleeve 1 by a torsion spring 11.
The baffle 4 can rotate 90 degrees around the torsion spring 11, when throttling begins, the lower slide cylinder 3 falls into the elastic claw 5, the baffle 4 rotates 90 degrees around the torsion spring 11 to cover the lower end face of the sleeve 1, and the downhole high-pressure gas flows to a wellhead through the throttle hole 41 on the baffle 4.
Alternatively, as shown in fig. 2 and referring to fig. 1, the surface of the baffle 4 contacting the lower end surface of the sleeve 1 is an arc surface C, and a slide 42 is provided on the arc surface C.
The surface of the baffle 4, which is contacted with the lower end surface of the sleeve 1, is designed into an arc-shaped surface C, and meanwhile, the lower end surface of the sleeve 1 is designed into an arc-shaped groove matched with the arc-shaped surface C, so that when throttling begins, the arc-shaped surface C of the baffle 4 is tangent with the arc-shaped groove of the sleeve 1 to form a seal, and high-pressure gas flows to a wellhead through the throttling hole 41; the slide way 42 is arranged on the arc-shaped surface C, so that the upper slide cylinder 2 and the lower slide cylinder 3 can slide downwards along the slide way 42 after the shearing pin 9 between the upper slide cylinder 2, the lower slide cylinder 3 and the sleeve 1 is sheared.
Optionally, as shown in fig. 3 and referring to fig. 1, at least one blocking block 43 is disposed on the bottom end surface of the baffle 4, and the at least one blocking block 43 is uniformly distributed around the orifice 41;
the blocking piece 43 is used for blocking the first falling body 6, and preventing the first falling body 6 from closing the orifice 41.
When the shear pin 9 between the lower slide cylinder 3 and the sleeve 1 is sheared, the first falling body 6 and the lower slide cylinder 3 simultaneously fall outside the sleeve 1, the baffle 4 covers the lower end face of the sleeve 1, the lower slide cylinder 3 is clamped by the elastic claw 5, at the moment, the first falling body 6 is lifted by underground high-pressure gas, the first falling body 6 can be possibly caused to float up and down, in order to prevent the first falling body 6 from blocking the throttle hole 41 on the baffle 4, the throttle is influenced, a blocking block 43 can be arranged on the end face of the bottom of the baffle 4, and the blocking block 43 can block the first falling body 6 to close the throttle hole 41.
Optionally, 3 blocking blocks 43,3 blocking blocks 43 are arranged on the bottom end surface of the baffle plate 4, and distributed on the bottom end surface of the baffle plate 4 in a triangular shape, and the orifice 41 is located at the center of the triangle.
Optionally, the downhole choke further comprises an upper joint 12, one end of the upper joint 12 is connected with one end of the sleeve 1 through threads, and the other end of the upper joint 12 is connected with the oil pipe through threads.
Alternatively, the other end of the sleeve 1 is connected to one end of the lower joint 8 by a screw thread, and the other end of the lower joint 8 is connected to an oil pipe by a screw thread.
The sleeve 1 is connected with the upper joint 12 and the lower joint 8 through threads, the upper joint 12 and the lower joint 8 are connected with an oil pipe through threads, when the underground pressure is higher, the phenomenon that the underground throttle is flushed to a wellhead cannot occur, the connection is more reliable, and the safety is improved.
Optionally, a sealing body 13 is arranged between the outer wall of the sleeve 1 and the inner wall of the upper joint 12 and the inner wall of the lower joint 8.
Alternatively, the sealing body 13 may be an O-ring seal.
The sealing body 13 is arranged between the outer wall of the sleeve 1 and the inner walls of the upper joint 12 and the lower joint 8, so that the sealing performance of the underground throttle can be improved, the underground high-pressure gas is prevented from flowing to the wellhead without passing through the throttle hole 41, and the number of the sealing bodies 13 can be selected according to actual conditions.
Optionally, an O-ring seal is provided between the shear pin 9 and the sleeve 1, which improves the seal of the downhole choke and prevents high pressure downhole gas from flowing to the wellhead without passing through the orifice 41.
In the embodiment of the invention, two ends of an underground throttle are connected with an oil pipe outside a well, the oil pipe and the underground throttle which are connected together are simultaneously put into the well, when the throttle starts, a first falling body 6 is put into, the first falling body 6 seals a sliding cylinder 3, meanwhile, pressure is applied to the first falling body 6 until a shearing pin 9 between the sliding cylinder 3 and a sleeve 1 is sheared off, the sliding cylinder 3 falls into a spring claw 5, a baffle 4 covers the lower end face of the sleeve 1 at the moment, and underground high-pressure air flows to a wellhead through an orifice 41 on the baffle 4 to realize the throttle; when the throttling is stopped, the second falling body 7 is put into, the second falling body 7 seals the upper sliding cylinder 2, meanwhile, pressure is applied to the second falling body 7 until a shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 is sheared, the upper sliding cylinder 2 slides down until the bottom end face of the upper sliding cylinder 2 is contacted with the top end face of the lower sliding cylinder 3, at the moment, the top end face of the upper sliding cylinder 2 is positioned in the sleeve 1, the baffle plate 4 is opened, the first falling body 6 and the second falling body 7 are lifted to the ground by underground high-pressure gas, and the throttling is stopped. When the underground restrictor is positioned under ultrahigh pressure, the underground restrictor can work normally, and the problem that the underground restrictor is flushed to a wellhead due to slip deformation when the common underground restrictor is positioned in a high-pressure well or cannot be throttled due to rubber cylinder deformation under high pressure is solved.
Example two
The embodiment of the invention provides an oil and gas field gas production system, which comprises a downhole tubular column structure, wherein the downhole tubular column structure comprises a downhole choke described in the first embodiment, and the downhole choke is used for throttling high-pressure gas in a well.
In the embodiment of the invention, two ends of an underground throttle are connected with an oil pipe outside a well, the oil pipe and the underground throttle which are connected together are simultaneously put into the well, when the throttle starts, a first falling body 6 is put into, the first falling body 6 seals a sliding cylinder 3, meanwhile, pressure is applied to the first falling body 6 until a shearing pin 9 between the sliding cylinder 3 and a sleeve 1 is sheared off, the sliding cylinder 3 falls into a spring claw 5, a baffle 4 covers the lower end face of the sleeve 1 at the moment, and underground high-pressure air flows to a wellhead through an orifice 41 on the baffle 4 to realize the throttle; when the throttling is stopped, the second falling body 7 is put into, the second falling body 7 seals the upper sliding cylinder 2, meanwhile, pressure is applied to the second falling body 7 until a shearing pin 9 between the upper sliding cylinder 2 and the sleeve 1 is sheared, the upper sliding cylinder 2 slides down until the bottom end face of the upper sliding cylinder 2 is contacted with the top end face of the lower sliding cylinder 3, at the moment, the top end face of the upper sliding cylinder 2 is positioned in the sleeve 1, the baffle plate 4 is opened, and the first falling body 6 and the second falling body 7 are lifted to the ground by underground high pressure, so that the throttling is stopped. When the underground restrictor is positioned under ultrahigh pressure, the underground restrictor can work normally, and the problem that the underground restrictor is flushed to a wellhead due to slip deformation when the common underground restrictor is positioned in a high-pressure well or cannot be throttled due to rubber cylinder deformation under high pressure is solved.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A downhole choke, the downhole choke comprising:
the device comprises a sleeve, an upper sliding cylinder, a lower sliding cylinder, a baffle plate, a spring claw, a first falling body, a second falling body and a lower joint;
the top of the sleeve is connected with an oil pipe, the bottom of the sleeve is connected with one end of the lower joint, the other end of the lower joint is connected with the oil pipe, and the elastic claw is fixed on the inner wall of the lower joint;
the baffle is arranged on the lower end surface of the sleeve, and an orifice is arranged in the baffle;
the upper sliding cylinder and the lower sliding cylinder are fixed on the inner wall of the sleeve through shear pins, the upper sliding cylinder is communicated with the lower sliding cylinder, one end of the lower sliding cylinder extends out of the sleeve and blocks the baffle plate from covering the lower end face of the lower sliding cylinder, the inner diameter of the upper end of the lower sliding cylinder is provided with a chamfer, and the inner diameter of the upper end of the upper sliding cylinder is provided with a chamfer;
the diameter of the first falling body is larger than or equal to the inner diameter of the lower sliding cylinder and smaller than the inner diameter of the upper sliding cylinder, and the diameter of the second falling body is larger than or equal to the inner diameter of the upper sliding cylinder;
when the first falling body is put into the oil pipe, the first falling body falls to the upper port of the lower sliding cylinder to seal the lower sliding cylinder, pressure is applied to the first falling body until the shearing pin is sheared off, the first falling body and the lower sliding cylinder fall out of the sleeve, the spring claw clamps the lower sliding cylinder, the baffle covers the lower end face of the sleeve, and throttling begins;
when the second falling body is put into the oil pipe, the second falling body falls to the upper end face of the upper sliding cylinder to seal the upper sliding cylinder, pressure is applied to the second falling body until the shearing pin is sheared off, one end of the upper sliding cylinder is contacted with one end of the lower sliding cylinder far away from the bottom of the well, the other end of the upper sliding cylinder is positioned in the sleeve, the baffle is opened, and the first falling body and the second falling body are lifted to the ground by underground high-pressure gas to stop throttling.
2. The downhole choke of claim 1, wherein the first and second drops are of a spherical configuration.
3. A downhole choke according to claim 1, wherein the baffle is connected with the lower end surface of the sleeve by a torsion spring.
4. A downhole choke as set forth in claim 1 wherein said sleeve is provided with four shear pin holes,
two shear pins fix the upper slide on the inner wall of the sleeve through two shear pin holes, and the other two shear pins fix the lower slide on the inner wall of the sleeve through the other two shear pin holes.
5. The downhole choke of claim 1, wherein at least one blocking block is provided on a bottom end face of the baffle, the at least one blocking block being evenly distributed around the orifice;
the blocking block is used for blocking the first falling body and preventing the first falling body from closing the throttle hole.
6. The downhole choke of claim 5, wherein the bottom end surface of the baffle is provided with 3 blocking pieces, and the 3 blocking pieces are distributed in a triangle shape on the bottom end surface of the baffle.
7. The downhole choke of claim 1, further comprising an upper joint having one end threadably connected to one end of the sleeve and the other end threadably connected to the tubing.
8. A downhole choke according to claim 7, wherein a sealing body is provided between the outer wall of the sleeve and the inner wall of the upper joint.
9. A downhole choke according to claim 1, wherein a seal is provided at the junction of the sleeve and the lower joint.
10. An oil and gas field gas production system comprising a downhole choke according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510898456.9A CN106854985B (en) | 2015-12-08 | 2015-12-08 | Downhole choke and oil field gas production system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510898456.9A CN106854985B (en) | 2015-12-08 | 2015-12-08 | Downhole choke and oil field gas production system |
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| CN106854985A CN106854985A (en) | 2017-06-16 |
| CN106854985B true CN106854985B (en) | 2023-04-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106854985A (en) | 2017-06-16 |
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