CN113700454B - Novel sand setting bottom screen plug - Google Patents
Novel sand setting bottom screen plug Download PDFInfo
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- CN113700454B CN113700454B CN202010445895.5A CN202010445895A CN113700454B CN 113700454 B CN113700454 B CN 113700454B CN 202010445895 A CN202010445895 A CN 202010445895A CN 113700454 B CN113700454 B CN 113700454B
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- central tube
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- traveling valve
- hole
- radial
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- 239000004576 sand Substances 0.000 title claims abstract description 77
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000004323 axial length Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 abstract description 29
- 239000007924 injection Substances 0.000 abstract description 29
- 230000000903 blocking effect Effects 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 8
- 239000002332 oil field water Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 32
- 238000000034 method Methods 0.000 description 20
- 238000011010 flushing procedure Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 14
- 230000018109 developmental process Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a novel sand setting bottom screen plug, which comprises: the central tube is provided with a radial through hole which is radially communicated with the central tube; the outer tube is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube; the traveling valve is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state; the valve seat is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat. The invention solves the problems of leakage and tool failure caused by various reasons, changes the internal structure, can avoid failures caused by foreign matter blocking, tripping and the like, prolongs the service life of the separate injection pipe column, and improves the benefit of oilfield water injection development.
Description
Technical Field
The invention relates to the technical field of oilfield separated layer water injection, in particular to a novel sand setting bottom screen plug.
Background
The sand setting bottom screen plug is an important component tool of a separate-layer water injection pipe column, and the main functions of the tool are as follows: firstly, in the water injection process, the closed pipe column is used for opening the water distributor; secondly, in the well flushing process, well flushing water circulates from the casing pipe to the oil pipe; thirdly, sand and scale in the pipe column fall into the sand setting tail pipe through the sand setting channel.
The tool is widely applied in oilfield development, but in the application process, mechanical impurity pads are leaked between the ball and the ball seat, the ball impacts the sand blocking cap to release, the ball and the ball seat corrode and scale to cause leakage and the like, so that water injection quantity is blocked and leaked from the bottom screen, separate-layer water injection cannot be realized, and a separate-injection pipe column is short in the effective period of a well.
CN 200820016175.1 discloses a double sand setting check valve used in petroleum industry, which is suitable for electric submersible pump oil production well. The device comprises an upper joint, a primary sand setting mechanism and a secondary sand setting mechanism are arranged, the primary sand setting mechanism and the secondary sand setting mechanism are connected together through a central pipe jacket, two sand setting cavities are formed, and the sand setting effect is improved. After sand blocking and sand setting of the two sand setting mechanisms, the sand carrying amount in the oil passing through the invention is greatly reduced, the damage of gravel to the electric submersible pump is reduced, the service life of the electric submersible pump is prolonged, the pump detection operation period of the electric submersible pump oil production well is prolonged, and the economic benefit is improved.
The tool is widely applied in oilfield development, but mechanical impurity pads are leaked between the ball and the ball seat in the application process, the ball impacts the sand blocking cap to release, the ball and the ball seat corrode and scale to cause leakage and the like, and the dispensing pipe column is short in the effective period of the well.
Compared with the comparative document CN 200820016175.1, the invention has 2 different points and technical advantages as follows: 1. the invention is applicable to high-pressure water injection wells with different well conditions; 2. the invention realizes the functions of sealing a tubular column, flushing a well and setting sand. The sand setting bottom screen plug is an important component tool of a separate-layer water injection pipe column, and the main functions of the tool are as follows: firstly, in the water injection process, the closed pipe column is used for opening the water distributor; secondly, in the well flushing process, well flushing water circulates from the casing pipe to the oil pipe; thirdly, sand and scale in the pipe column fall into the sand setting tail pipe through the sand setting channel.
CN 201520917681.8 discloses a sand setting single flow valve at the bottom of a water injection pipe column, which comprises a sleeve, a single flow valve group, a flow passage joint, an angle pipe and a sand setting tail pipe, wherein the sand setting single flow valve is connected to the bottom of the water injection pipe column, when sand setting in the water injection pipe column on the water injection pipe column falls, the sand setting single flow valve is sunk into the sand setting tail pipe through a lower crescent channel and an upper crescent channel, the sand setting single flow valve cannot be accumulated on the single flow valve group, the axis of the angle pipe is different from the axis of the flow passage joint, the distance between the two axes is 4-19m, the angle pipe is positioned at one side inside the flow passage joint, the flow passages of the lower crescent channel and the upper crescent channel are concentrated than the flow passage of the angle pipe when the angle pipe is positioned at the centering position, sand is not blocked, the sunk sand can smoothly pass through the sand setting tail pipe at the lower part, the sand setting single flow valve is prevented from being buried by the sand, and when a well is backwashed, the valve ball can be washed by well washing water.
The tool is widely applied in oilfield development, but mechanical impurity pads are leaked between the ball and the ball seat in the application process, the ball impacts the sand blocking cap to release, the ball and the ball seat corrode and scale to cause leakage and the like, and the dispensing pipe column is short in the effective period of the well.
Compared with the comparative document CN 201520917681.8, the invention has 2 different points and technical advantages as follows: 1. the invention has different working principles and more reliable work. 2. The structure is simpler. The manufacturing and processing are simple and convenient, and the accessories are less and have long service life. The sand setting bottom screen plug is an important component tool of a separate-layer water injection pipe column, and the main functions of the tool are as follows: firstly, in the water injection process, the closed pipe column is used for opening the water distributor; secondly, in the well flushing process, well flushing water circulates from the casing pipe to the oil pipe; thirdly, sand and scale in the pipe column fall into the sand setting tail pipe through the sand setting channel.
2016.12 University of Yangtze river report (from Kong edition), the improvement research of sand bottom screen blocking of the oil field of winning lump aims at solving the problems that the long-term water injection to the injection well causes corrosion, scale and leakage in the sand bottom screen blocking and repeated well flushing causes the blockage and well flushing in the sand bottom screen blocking, and the main influencing factors causing the sand bottom screen blocking failure are found. Aiming at the problems of sand setting type bottom screen plugs, the bottom screen plugs are improved, firstly, a sand setting channel is transformed from 10 holes to annular cutting, and the overflow area is increased by 43%; secondly, different materials are selected, the corrosion resistance and the price of the materials are compared, the materials after improvement are determined to be stainless steel, and the ball seat is changed into a split type from an integral type; thirdly, the ball claw material is improved, the sealing performance is enhanced around, and the spring is prevented from being clamped or the valve ball pad is prevented from being broken due to sand setting accumulation. The periphery of the ball claw supporting the valve ball and the spring is fixed by a metal ring and sealed by a rubber ring, so that the spring is prevented from being clamped or the valve ball pad is prevented from being broken due to sand setting accumulation.
The tool is widely applied in oilfield development, but mechanical impurity pads are leaked between the ball and the ball seat in the application process, the ball impacts the sand blocking cap to release, the ball and the ball seat corrode and scale to cause leakage and the like, and the dispensing pipe column is short in the effective period of the well.
Compared with the comparison file, the invention has 2 different points and technical advantages as follows: 1. the invention has different working principles and more reliable work. 2. The structure is simpler, the internal components are removed, and the sand setting channel is larger. The sand setting bottom screen plug is an important component tool of a separate-layer water injection pipe column, and the main functions of the tool are as follows: firstly, in the water injection process, the closed pipe column is used for opening the water distributor; secondly, in the well flushing process, well flushing water circulates from the casing pipe to the oil pipe; thirdly, sand and scale in the pipe column fall into the sand setting tail pipe through the sand setting channel.
The technical scheme, the technical problems to be solved and the generated beneficial effects of the disclosed technology are different from those of the invention, or the technical field or application occasion is different, and the technical documents disclosed above have no technical teaching aiming at more technical features, the technical problems to be solved and the beneficial effects of the invention.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a novel sand setting bottom screen plug, which solves the problems of leakage and tool failure caused by various reasons, changes the internal structure, can avoid failures caused by foreign matter blocking, tripping and the like, prolongs the service life of a separate injection pipe column, and improves the benefit of oilfield water injection development.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A novel sand setting bottom screen plug, comprising:
the central tube is provided with a radial through hole which is radially communicated with the central tube;
the outer tube is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube;
the traveling valve is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state;
The valve seat is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat.
Further, an O-shaped ring for sealing is arranged on the inner wall of the traveling valve, the inner wall of the traveling valve and the outer wall of the central tube are in a sealing state, the inside of the outer tube is provided with a stepped hole, namely, the inner tube comprises a large-diameter cavity tube section and a small-diameter cavity tube section, and the outer diameter of the traveling valve is smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Further, the upper end of the traveling valve is provided with a top cap, and the outer diameter of the top cap is consistent with the inner diameter of the small-diameter cavity pipe section of the outer pipe.
Further, the method further comprises the following steps:
The spring is sleeved on the outer circle of the central tube, and the lower end of the spring props against the upper end face of the top cap of the traveling valve.
Further, the method further comprises the following steps:
the limiting sleeve is sleeved on the outer circle of the central tube, is integrally positioned in the large-diameter cavity tube section of the outer tube, protects the spring inside the limiting sleeve, and has an outer diameter larger than the inner diameter of the small-diameter cavity tube section of the outer tube and an inner diameter smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Further, the axial distance from the lower end of the limiting sleeve to the upper end of the valve seat is greater than the axial length of the traveling valve.
Further, the upper end of the outer tube is connected with the upper connector in a threaded manner, the upper end of the central tube is inserted into the inner hole of the central tube, the outer diameter of the upper end of the central tube is consistent with the inner diameter of the inner hole of the upper connector, and the upper end of the spring props against the lower end face of the upper connector.
Further, the lower end of the outer tube is connected with the outer wall of the lower joint in a threaded manner, and the lower end of the central tube is connected with the inner hole of the lower joint in a threaded manner.
Further, a stepped hole is formed in the lower connector, the upper end of the stepped hole is communicated to the lower end of the traveling valve, a radial through hole of the lower connector is formed in the lower connector, and the radial through hole of the lower connector is communicated with the stepped hole in the lower connector.
Further, the valve seat is of an annular structure, the inner diameter of the valve seat is larger than the outer diameter of the central tube, the upper end face of the valve seat is limited by the limiting table on the inner wall of the outer tube, and the lower end face of the valve seat is limited by the upper end face of the lower connector.
Compared with the prior art, the invention has the following beneficial effects:
When water is injected, the traveling valve and the valve seat are in a sealing state by means of water injection pressure and a spring in the pipe column, so that the annular space of the oil sleeve and a channel of the inner cavity of the pipe column are isolated; during back flushing, the flushing fluid pushes the traveling valve compression spring to open the flushing channel upwards through the radial through hole and the annular flow passage, and then flows into the annular flow passage, flows out of the ground through the radial through hole, the inner hole of the central tube and the tubular column. The structure and the process have no technical problems of leakage or tripping caused by foreign matter blockage, so the invention can avoid the failure problems caused by foreign matter blockage, tripping, and the like in the prior art, change the structure of the screen plug of the sand setting bottom, eliminate the failure point of a tool, increase the area of a sand setting channel, prolong the service life of a separate injection pipe column, and improve the benefit of water injection development of an oil field.
Drawings
FIG. 1 is a schematic diagram of a novel sand setting bottom screen plug.
In the figure: the device comprises a 1-upper joint, a 2-outer tube, a 3-O-shaped ring, a 4-limit sleeve, a 5-central tube, a 6-spring, a 7-traveling valve, an 8-radial through hole, a 9-radial through hole, a 10-annular flow passage, an 11-O-shaped ring, a 12-valve seat, a 13-O-shaped ring, a 14-annular flow passage, a 15-radial through hole, a 16-lower joint and a 17-O-shaped ring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
Referring to fig. 1, the present invention provides a technical solution:
A novel sand setting bottom screen plug, comprising:
a central tube 5 provided with a radial through hole of the central tube which is radially penetrated;
the outer tube 2 is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube;
The traveling valve 7 is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state;
The valve seat 12 is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat.
Further, an O-shaped ring for sealing is arranged on the inner wall of the traveling valve, the inner wall of the traveling valve and the outer wall of the central tube are in a sealing state, the inside of the outer tube is provided with a stepped hole, namely, the inner tube comprises a large-diameter cavity tube section and a small-diameter cavity tube section, and the outer diameter of the traveling valve is smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Further, the upper end of the traveling valve is provided with a top cap, and the outer diameter of the top cap is consistent with the inner diameter of the small-diameter cavity pipe section of the outer pipe.
Further, the method further comprises the following steps:
And the spring 6 is sleeved on the outer circle of the central tube, and the lower end of the spring props against the upper end face of the top cap of the traveling valve.
Further, the method further comprises the following steps:
And the limiting sleeve 4 is sleeved on the outer circle of the central tube, is integrally positioned in the large-diameter cavity tube section of the outer tube, protects the spring in the limiting sleeve, and has an outer diameter larger than the inner diameter of the small-diameter cavity tube section of the outer tube and an inner diameter smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Further, the axial distance from the lower end of the limiting sleeve to the upper end of the valve seat is greater than the axial length of the traveling valve.
Further, the upper end of the outer tube is connected with the upper joint 1 in a threaded manner, the upper end of the central tube is inserted into the inner hole of the central tube, the outer diameter of the upper end of the central tube is consistent with the inner diameter of the inner hole of the upper joint, and the upper end of the spring props against the lower end face of the upper joint.
Further, the lower end of the outer tube is connected with the outer wall of the lower joint 16 in a threaded manner, and the lower end of the central tube is connected with the inner hole of the lower joint in a threaded manner.
Further, a stepped hole is formed in the lower connector, namely the upper end of the annular flow passage 14 is communicated to the lower end of the traveling valve, a radial through hole of the lower connector is formed in the lower connector, and the radial through hole of the lower connector is communicated with the stepped hole in the lower connector.
Further, the valve seat is of an annular structure, the inner diameter of the valve seat is larger than the outer diameter of the central tube, the upper end face of the valve seat is limited by the limiting table on the inner wall of the outer tube, and the lower end face of the valve seat is limited by the upper end face of the lower connector.
The upper joint 1 is in threaded connection with the upper end of the outer tube 2, the lower end of the outer tube 2 is in threaded connection with the lower joint 16, the upper end of the central tube 5 is inserted into an inner hole of the upper joint 1, the lower end of the central tube 5 is in threaded connection with the inner thread of the lower joint 16, the limiting sleeve 4, the spring 6 and the traveling valve 7 are respectively sleeved on the outer circle of the upper part of the central tube 5, the valve seat 12 is embedded in the inner hole of the lower end part of the outer tube 2, the outer conical surface of the lower end of the traveling valve 7 and the inner conical surface of the upper end of the valve seat 12 form a sealing pair, a group of radial through holes 9 are formed in the middle upper part of the central tube 5, a group of radial through holes 8 are formed in the traveling valve 7, and an inner step hole is formed in the upper part of the lower joint 16 and communicated with a group of radial through holes 15.
The working principle is that the traveling valve 7 and the valve seat 12 are in a sealing state by means of water injection pressure in the pipe column and the spring 6 when water is injected, so that the passage between the annular space of the oil sleeve and the inner cavity of the pipe column is isolated; during back flushing, the flushing fluid pushes the traveling valve 7 to compress the spring 6 through the radial through holes 15 and the annular flow passage 14 so that the traveling valve is upwards opened to open a flushing passage, then flows into the annular flow passage 10, enters the inner hole of the central tube 5 and the tubular column through the radial through holes 8 and 9, and flows out of the ground. The structure and the process have no technical problems of leakage or tripping caused by foreign matter blockage, so the invention can avoid the failure problems caused by foreign matter blockage, tripping, and the like in the prior art, change the structure of the screen plug of the sand setting bottom, eliminate the failure point of a tool, increase the area of a sand setting channel, prolong the service life of a separate injection pipe column, and improve the benefit of water injection development of an oil field.
Example 2:
Referring to fig. 1, the present invention provides a technical solution:
A novel sand setting bottom screen plug, comprising:
a central tube 5 provided with a radial through hole of the central tube which is radially penetrated;
the outer tube 2 is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube;
The traveling valve 7 is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state;
The valve seat 12 is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat.
Further, an O-shaped ring for sealing is arranged on the inner wall of the traveling valve, the inner wall of the traveling valve and the outer wall of the central tube are in a sealing state, the inside of the outer tube is provided with a stepped hole, namely, the inner tube comprises a large-diameter cavity tube section and a small-diameter cavity tube section, and the outer diameter of the traveling valve is smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Further, the upper end of the traveling valve is provided with a top cap, and the outer diameter of the top cap is consistent with the inner diameter of the small-diameter cavity pipe section of the outer pipe. Prevent impurity from entering the stop collar inside above the traveling valve.
Further, the method further comprises the following steps:
And the spring 6 is sleeved on the outer circle of the central tube, and the lower end of the spring props against the upper end face of the top cap of the traveling valve.
Further, the method further comprises the following steps:
And the limiting sleeve 4 is sleeved on the outer circle of the central tube, is integrally positioned in the large-diameter cavity tube section of the outer tube, protects the spring in the limiting sleeve, and has an outer diameter larger than the inner diameter of the small-diameter cavity tube section of the outer tube and an inner diameter smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Further, the axial distance from the lower end of the limiting sleeve to the upper end of the valve seat is greater than the axial length of the traveling valve.
Further, the upper end of the outer tube is connected with the upper joint 1 in a threaded manner, the upper end of the central tube is inserted into the inner hole of the central tube, the outer diameter of the upper end of the central tube is consistent with the inner diameter of the inner hole of the upper joint, and the upper end of the spring props against the lower end face of the upper joint.
Example 3:
Referring to fig. 1, the present invention provides a technical solution:
A novel sand setting bottom screen plug, comprising:
a central tube 5 provided with a radial through hole of the central tube which is radially penetrated;
the outer tube 2 is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube;
The traveling valve 7 is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state;
The valve seat 12 is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat.
Further, an O-shaped ring for sealing is arranged on the inner wall of the traveling valve, the inner wall of the traveling valve and the outer wall of the central tube are in a sealing state, the inside of the outer tube is provided with a stepped hole, namely, the inner tube comprises a large-diameter cavity tube section and a small-diameter cavity tube section, and the outer diameter of the traveling valve is smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
Example 4:
Referring to fig. 1, the present invention provides a technical solution:
A novel sand setting bottom screen plug, comprising:
a central tube 5 provided with a radial through hole of the central tube which is radially penetrated;
the outer tube 2 is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube;
The traveling valve 7 is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state;
The valve seat 12 is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat.
Although all of the above embodiments use fig. 1, it will be apparent to those skilled in the art that a separate drawing is not provided to illustrate the embodiments, so long as the missing components or structural features are removed from the drawing. As will be clear to a person skilled in the art. Of course, the more components of the embodiment are just the best mode, the fewer components of the embodiment are basic embodiments, but the basic object of the invention can be achieved, so all of them are within the scope of the invention.
In the application, all parts which are not expanded and discussed and the connecting mode of all parts in the application belong to the known technology in the technical field, and are not repeated. Such as welding, threaded connections, etc.
In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A novel sand setting bottom screen plug, comprising:
the central tube is provided with a radial through hole which is radially communicated with the central tube;
the outer tube is sleeved outside the central tube, and an annular space is formed between the outer tube and the central tube;
the traveling valve is arranged on the outer circle of the central tube and axially slides relative to the central tube, the traveling valve is also provided with a traveling valve radial through hole, and the central tube radial through hole and the traveling valve radial through hole are in a radial communication state;
The valve seat is inlaid on the inner wall of the outer tube, an inner conical surface is formed in the inner wall of the upper port of the valve seat, an outer conical surface is formed in the outer wall of the lower end of the traveling valve, and a sealing pair is formed by the outer conical surface of the lower end of the traveling valve and the inner conical surface of the upper end of the valve seat.
2. The novel sand setting bottom screen plug according to claim 1, wherein an O-shaped ring for sealing is arranged on the inner wall of the traveling valve, the inner wall of the traveling valve and the outer wall of the central pipe are in a sealing state, the inner part of the outer pipe is provided with a stepped hole, namely, the inner part of the outer pipe comprises a large-diameter cavity pipe section and a small-diameter cavity pipe section, and the outer diameter of the traveling valve is smaller than the inner diameter of the small-diameter cavity pipe section of the outer pipe.
3. The novel sand setting bottom screen plug according to claim 2, wherein the upper end of the traveling valve is provided with a top cap, and the outer diameter of the top cap is consistent with the inner diameter of the small-diameter cavity pipe section of the outer pipe.
4. A new sand setting bed screen as claimed in claim 3, further comprising:
The spring is sleeved on the outer circle of the central tube, and the lower end of the spring props against the upper end face of the top cap of the traveling valve.
5. The novel grit chamber screen plug of claim 4, further comprising:
the limiting sleeve is sleeved on the outer circle of the central tube, is integrally positioned in the large-diameter cavity tube section of the outer tube, protects the spring inside the limiting sleeve, and has an outer diameter larger than the inner diameter of the small-diameter cavity tube section of the outer tube and an inner diameter smaller than the inner diameter of the small-diameter cavity tube section of the outer tube.
6. The novel sand setting bottom screen as in claim 5, wherein the axial distance from the lower end of the stop collar to the upper end of the valve seat is greater than the axial length of the traveling valve.
7. The novel sand setting bottom screen as in claim 4, 5 or 6, wherein the upper end of the outer tube is connected with the upper joint in a threaded manner, the upper end of the central tube is inserted into the inner hole of the central tube, the outer diameter of the upper end of the central tube is consistent with the inner diameter of the inner hole of the upper joint, and the upper end of the spring is propped against the lower end face of the upper joint.
8. The novel sand setting bottom screen as in claim 4, 5 or 6, wherein the lower end of the outer tube is threaded to the outer wall of the lower joint and the lower end of the central tube is threaded to the inner bore of the lower joint.
9. The novel sand setting bottom screen as claimed in claim 8, wherein the lower joint is internally provided with a stepped hole, the upper end of the stepped hole is communicated with the lower end of the traveling valve, the lower joint is provided with a lower joint radial through hole, and the lower joint radial through hole is communicated with the stepped hole in the lower joint.
10. The novel sand setting bottom screen plug according to claim 9, wherein the valve seat is of an annular structure, the inner diameter of the valve seat is larger than the outer diameter of the central tube, the upper end face of the valve seat is limited by the limiting table on the inner wall of the outer tube, and the lower end face of the valve seat is limited by the upper end face of the lower joint.
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| CN212406676U (en) * | 2020-05-22 | 2021-01-26 | 中国石油化工股份有限公司 | Sand setting bottom screen plug |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4527629A (en) * | 1982-10-04 | 1985-07-09 | Whitley Oran D | Pressure differential circulating valve |
| US7523787B2 (en) * | 2005-11-18 | 2009-04-28 | Halliburton Energy Services, Inc. | Reverse out valve for well treatment operations |
| CN201152165Y (en) * | 2008-01-11 | 2008-11-19 | 中国石化集团胜利石油管理局井下作业公司 | Compound type sand-setting uniflow valve |
| CN201507276U (en) * | 2009-08-28 | 2010-06-16 | 中国石油化工股份有限公司 | Sand prevention valve for controlling washing of well |
| CN103334919B (en) * | 2012-06-04 | 2016-03-30 | 中国石油化工股份有限公司江苏油田分公司 | Triple channel sand prevention standing valve |
| CN204691752U (en) * | 2015-05-15 | 2015-10-07 | 辽河石油勘探局 | A kind of seperated layer water injection sand setting ball seat |
| CN205089284U (en) * | 2015-11-17 | 2016-03-16 | 中国石油化工股份有限公司 | Water injection string bottom sand setting single current valve |
| CN205297410U (en) * | 2015-12-21 | 2016-06-08 | 中国石油天然气股份有限公司 | a well flushing valve |
| CN109779583B (en) * | 2017-11-10 | 2021-01-22 | 中国石油化工股份有限公司 | Constant-flow water distribution equipment and method |
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