CN114439401A - Variable double-flow-channel sand washing mechanism and method - Google Patents
Variable double-flow-channel sand washing mechanism and method Download PDFInfo
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- CN114439401A CN114439401A CN202011121692.7A CN202011121692A CN114439401A CN 114439401 A CN114439401 A CN 114439401A CN 202011121692 A CN202011121692 A CN 202011121692A CN 114439401 A CN114439401 A CN 114439401A
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- 239000004576 sand Substances 0.000 title claims abstract description 52
- 230000007246 mechanism Effects 0.000 title claims abstract description 51
- 238000005406 washing Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007921 spray Substances 0.000 claims abstract description 39
- 230000008859 change Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 107
- 238000003825 pressing Methods 0.000 claims description 34
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 30
- 230000003628 erosive effect Effects 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 210000004907 gland Anatomy 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011010 flushing procedure Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003466 welding 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/03—Freeing by flushing
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a variable double-flow-passage sand washing mechanism and a method, comprising a nozzle sleeve, an internal switch and an external switch; the external through switch is a central pipe, the central pipe is positioned inside the nozzle pipe, and the internal through switch is arranged on the central pipe; the nozzle sleeve is provided with a radial outer spray hole, the inner wall of the nozzle sleeve is provided with an inner annular groove, and the outer spray hole is communicated with the inner annular groove; the central tube is provided with a radial inner spray hole, the outer wall of the central tube is provided with an outer annular groove, and the inner spray hole is communicated with the outer annular groove; the internal through switch can plug a channel in the central tube in an initial state, and meanwhile, an inner ring groove of the nozzle sleeve is communicated with an outer ring groove of the central tube to realize external circulation; when the central tube moves downwards, the internal through switch can open a channel in the central tube, and meanwhile, the central tube moves downwards to enable the inner ring groove and the outer ring groove to axially slide and be plugged in a staggered mode, so that internal circulation is achieved. The invention realizes that jet flow is sprayed out from different flow channels through the structure, improves the sand washing jet flow effect, can further improve the success rate of sand washing operation, and simultaneously, the flow channel direction changing mechanism can also be used as a direction changing mechanism in other well washing tools, gravel filling tools and other tools needing to change the flow channel.
Description
Technical Field
The invention relates to the technical fields of well flushing, sand washing, filling and the like of oil and gas wells, in particular to a variable double-flow-channel sand washing mechanism and a method.
Background
After sand is produced in an oil and gas well, a pen-point-shaped guide shoe is generally put in to carry out sand washing operation for recovery production, and the flow channels during sand washing are only one group, so that the form of the sprayed fluid is single, and formation sand cannot be effectively washed and discharged in a complex sand production environment.
Publication (bulletin) No.: CN204703809U, publication (announcement) day: 2015-10-14 relates to a concentric double-pipe sand-washing well-washing process pipe column of a water source well, which consists of a water faucet, a packer, a concentric oil pipe and a well washer which are sequentially connected from top to bottom; the faucet is double-flow-channel and can rotate freely, and the concentric oil pipe is provided with a central overflowing channel and an annular overflowing channel which are respectively communicated with the double-flow channels of the faucet. The concentric double-pipe sand-flushing well-flushing process pipe column for the water source well meets the process requirements of strong flushing thrust and strong sand-carrying capacity, and the well-flushing device can be used for removing the blockage of a near-wellbore area to a certain extent and effectively removing the settled sand at the bottom of the well.
Publication (bulletin) No.: CN203730269U, publication (public notice) day: 2014-07-23 discloses a parallel double-cavity sand pump, wherein a lower pump discharge valve is arranged on the lower part of a lower pump plunger, a lower pump inlet valve is arranged on the lower part of a lower pump barrel, an upper outer pipe connector, an outer pipe, a lower outer pipe connector and a tail pipe connector are sequentially connected, the upper part of the lower pump barrel is in threaded connection with the lower part of the upper outer pipe connector, the upper pump plunger, an upper shunt barrel and a lower pump plunger are sequentially connected, an upper pump discharge valve is arranged in the upper shunt barrel, the lower shunt barrel is connected with the lower outer pipe connector, the upper end of the lower shunt barrel is inserted into the lower part of the lower pump inlet valve, the lower part of the lower shunt barrel is connected with the upper pump inlet valve, an upper pump inlet channel, an upper pump inlet annulus, an upper pump inlet hole, an upper pump inlet cavity, an upper pump outlet channel, an upper pump plunger inner hole and a total drainage hole are communicated, a circulation channel and the lower pump inlet channel are communicated with the lower pump inlet cavity, liquid can be fed and drained continuously during the upper and lower stroke, the sand-containing liquid flow does not stop, sand grains do not settle freely, and accumulated sand at the bottom of the well can be thoroughly removed, so that the oil-water well can produce normally.
Publication (bulletin) No.: CN109441399A, publication (announcement) day: 2019-03-08 discloses a bridge plug capable of washing sand, and belongs to the technical field of oil field exploitation. The device comprises an upper joint, an upper central pipe, a middle central pipe and a lower central pipe which are sequentially connected by threads from top to bottom; the inner side of the lower end of the lower central tube is in threaded connection with a ball seat, the lower end of the ball seat is in threaded connection with an insertion tube, and the lower end of the insertion tube is provided with a self-locking head; a switch sliding sleeve is arranged in the adapter, a positioning self-locking switch is arranged at the upper end of the switch sliding sleeve, and first sand washing channels are arranged on the switch sliding sleeve and the middle adapter; the outer portion of the middle joint is in threaded connection with a sand washing outer sleeve, the lower end of the sand washing outer sleeve is in threaded connection with an inclined opening guide shoe, and a second sand washing channel is arranged inside the inclined opening guide shoe. The sealing of the stratum is realized by one trip of the pipe column, and a special sand washing tool is not required to be put in; the bridge plug adopts a two-stage piston and three-group rubber cylinder structure, so that the setting is reliable and the success rate is high; the switch sliding sleeve is sealed reliable, can bear two-way pressure differential, and the pressure-bearing is high, has simplified the operation process, has improved construction cost rate, has reduced the operation risk.
In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, or the technical fields or the application occasions are different, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.
Disclosure of Invention
The invention aims to provide a variable double-flow-channel sand washing mechanism and a variable double-flow-channel sand washing method aiming at the defects in the prior art, jet flow is sprayed out from different flow channels through the structure, the sand washing jet flow effect is improved, the sand washing operation success rate can be further improved, and meanwhile, the flow channel direction changing mechanism can also be used as a direction changing mechanism in other tools needing to change the flow channels, such as well flushing tools, gravel filling tools and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a variable double-flow-channel sand washing mechanism comprises a nozzle sleeve, an internal through switch and an external through switch;
the external through switch is a central pipe, the central pipe is positioned inside the nozzle pipe, and the internal through switch is arranged on the central pipe;
the nozzle sleeve is provided with a radial outer spray hole, the inner wall of the nozzle sleeve is provided with an inner annular groove, and the outer spray hole is communicated with the inner annular groove;
the central tube is provided with a radial inner spray hole, the outer wall of the central tube is provided with an outer annular groove, and the inner spray hole is communicated with the outer annular groove;
the internal through switch can block a channel in the central tube in an initial state, and meanwhile, the inner annular groove of the nozzle sleeve is communicated with the outer annular groove of the central tube, so that external circulation is realized;
when the central tube moves downwards, the internal through switch can open a channel in the central tube, and meanwhile, the central tube moves downwards to enable the inner ring groove and the outer ring groove to axially slide and be plugged in a staggered mode, so that internal circulation is achieved.
Furthermore, a wear-resistant outer nozzle is arranged in the outer spray hole, and a wear-resistant inner nozzle is arranged in the inner spray hole.
Furthermore, the inner switch comprises a connecting joint, a pressing cap, an erosion-resistant sealing seat, a sealing mushroom head and a follow-up guide mechanism;
the erosion-resistant sealing seat is arranged on the inner wall of the upper port of the connecting joint, is the same as the connecting joint and is of an axially through structure, and an inner conical hole is formed in the inner wall of the upper port of the erosion-resistant sealing seat;
the connecting joint is pressed and fixed at the lower end port of the central tube through a pressing cap;
the outer mushroom spherical surface of the sealing mushroom head corresponds to the inner conical hole of the upper end opening of the erosion-resistant sealing seat and can seal the inner conical hole;
the follow-up guide mechanism is installed on the central pipe and connected with the sealing mushroom head.
Furthermore, the follow-up guide mechanism comprises a control spring, a telescopic rod, a sealing cover, a guide block, a guide seat and a sealing cover pressing cap;
the sealing cover is sleeved on the outer wall of the central pipe, the inner wall of the sealing cover and the outer wall of the central pipe are in sliding seal, and the outer wall of the sealing cover and the inner wall of the nozzle sleeve are in sliding seal;
the upper end of the control spring is connected with the lower end face of the sealing cover, and the lower end of the control spring is connected with a shoulder arranged on the outer wall of the central tube;
the guide block is arranged on a circular table on the inner wall of the sealing cover, the sealing cover pressing cap is arranged at the upper end port of the sealing cover and can tightly press the guide block, and the inner wall of the sealing cover pressing cap and the outer wall of the central pipe are in sliding seal;
the guide seat is positioned in the central tube, the central tube is provided with an axial guide groove, and the guide block radially penetrates through the guide groove and is connected with the guide seat;
the telescopic rod penetrates through an axial center hole formed in the guide seat, the telescopic rod and the guide seat can axially slide relative to each other, and the lower end of the telescopic rod is connected with the sealing mushroom head.
Furthermore, a pre-tightening spring is sleeved on the telescopic rod, the lower end of the pre-tightening spring props against the sealed mushroom head, and the upper end of the pre-tightening spring props against the guide seat; the lower end of the telescopic rod is provided with a guide head type retaining ring, and the outer diameter of the retaining ring is larger than the axial center hole of the guide seat.
Furthermore, an axial flow guide hole is formed in the guide seat.
Furthermore, the upper end face of the sealing cover pressing cap is limited by a limiting table arranged on the inner wall of the nozzle sleeve.
Further, the lower end of the nozzle sleeve is connected with the outer sleeve.
Furthermore, the lower end of the connecting joint is connected with the inner spray pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a use method of the variable double-flow-channel sand washing mechanism comprises the following steps:
in an initial state, the control spring is in a compressed state, pretightening force is generated on the sealing cover and the sealing cover pressing cap, the sealing cover and the sealing cover pressing cap are limited by the nozzle sleeve, at the moment, the embedded guide block is connected with the guide seat and is positioned at the lowest end position, an inner runner plug consisting of a telescopic rod and a sealing mushroom head is sleeved in the guide seat, contact sealing is formed between the guide seat and the erosion-resistant seal seat under the action of the pretightening spring, fluid cannot pass through the erosion-resistant seal seat, and accordingly flows outwards through an outer runner passage of the wear-resistant inner nozzle arranged on the central pipe and the wear-resistant outer nozzle arranged on the nozzle sleeve, and outer runner circulation is formed through the mechanism, so that outer circulation sand washing is realized;
under the runner change state, the center tube moves downwards, under the promotion of control spring, sealed lid and sealed lid press the relative upward motion of cap, thereby drive the guide block that imbeds wherein and upwards move along the center tube guide way, sealed lid presses the cap to close wear-resisting inner nozzle when upwards moving with sealed lid thereby close outer runner, thereby drive guide holder simultaneous upward movement, the guide holder motion is simultaneously because the telescopic link upper end adds thick, can be guided and drive upward movement together, the inner runner end cap that comprises telescopic link and sealed mushroom head at this moment leaves the seal receptacle of nai erosion thereby removing sealedly, the inner runner is opened, fluid accessible is able to be able to flow into the inner spray tube and form the inner runner circulation, realize the inner loop sand washing.
Compared with the prior art, the invention has the following beneficial effects:
(1) except that the movement of the central pipe needs to be actively triggered, the actions of other parts of the direction changing mechanism are all automatically triggered, the action is sensitive, and the operation is simple. The change of the flow channel can be realized only by lifting and lowering the central tube by the reversing mechanism.
(2) The mechanism adopts erosion-resistant materials for parts of the inner and outer runner openings, and has long service life.
(3) The mechanism has the advantages of simple flow channel direction changing principle, clear action logic and high reliability.
(4) The mechanism has wide applicability, and can be used in sand washing tools and other matched tools corresponding to well completion processes requiring flow channel conversion.
Drawings
FIG. 1 is an initial state diagram of the novel variable double-flow-passage sand washing mechanism of the present invention;
FIG. 2 is a state diagram of the novel variable double-flow-passage sand washing mechanism of the invention after the flow passages are changed;
fig. 3 is a cross-sectional view of the guide shoe.
In the figure: 1-an outer sleeve; 2-inner spray pipe; 3-a connecting joint; 4-pressing the cap; 5-erosion resistant seal seat; 6-a central tube; 7-control spring; 8-sealing the mushroom head; 9-pre-tightening the spring; 10-a telescopic rod; 11-a sealing cover; 12-a guide block; 13-a guide seat; 14-sealing the gland; 15-wear resistant outer nozzle; 16-wear resistant inner nozzle; 17-nozzle sleeve.
Detailed Description
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.
Example 1:
referring to fig. 1 to 3, the present invention provides a technical solution:
a variable double-flow-passage sand washing mechanism comprises a nozzle sleeve 17, an internal switch and an external switch;
the external switch is a central pipe 6, the central pipe is positioned inside the nozzle pipe, and the internal switch is arranged on the central pipe;
the nozzle sleeve is provided with a radial outer spray hole, the inner wall of the nozzle sleeve is provided with an inner annular groove, and the outer spray hole is communicated with the inner annular groove;
the central tube is provided with a radial inner spray hole, the outer wall of the central tube is provided with an outer annular groove, and the inner spray hole is communicated with the outer annular groove;
the internal through switch can plug a channel in the central tube in an initial state, and meanwhile, an inner ring groove of the nozzle sleeve is communicated with an outer ring groove of the central tube to realize external circulation;
when the central tube moves downwards, the internal through switch can open a channel in the central tube, and meanwhile, the central tube moves downwards to enable the inner ring groove and the outer ring groove to axially slide and be plugged in a staggered mode, so that internal circulation is achieved.
Further, a wear-resistant outer nozzle 15 is installed in the outer spray hole, and a wear-resistant inner nozzle 16 is installed in the inner spray hole.
Furthermore, the inner switch comprises a connecting joint 3, a pressing cap 4, an erosion-resistant sealing seat 5, a sealing mushroom head 8 and a follow-up guide mechanism;
the erosion-resistant sealing seat is arranged on the inner wall of the upper port of the connecting joint, is the same as the connecting joint and is of an axially through structure, and an inner conical hole is formed in the inner wall of the upper port of the erosion-resistant sealing seat;
the connecting joint is pressed and fixed at the lower end port of the central tube through a pressing cap;
the outer mushroom spherical surface of the sealing mushroom head corresponds to the conical hole in the upper end port of the erosion-resistant sealing seat and can seal the inner conical hole;
the follow-up guide mechanism is installed on the central pipe and connected with the sealing mushroom head.
Further, the follow-up guide mechanism comprises a control spring 7, a telescopic rod 10, a sealing cover 11, a guide block 12, a guide seat 13 and a sealing cover pressing cap 14;
the sealing cover is sleeved on the outer wall of the central pipe, the inner wall of the sealing cover and the outer wall of the central pipe are in sliding seal, and the outer wall of the sealing cover and the inner wall of the nozzle sleeve are in sliding seal;
the upper end of the control spring is connected with the lower end face of the sealing cover, and the lower end of the control spring is connected with a shoulder arranged on the outer wall of the central tube;
the guide block is arranged on a circular table on the inner wall of the sealing cover, the sealing cover pressing cap is arranged at the upper end port of the sealing cover and can tightly press the guide block, and the inner wall of the sealing cover pressing cap and the outer wall of the central pipe are in sliding seal;
the guide seat is positioned in the central tube, the central tube is provided with an axial guide groove, and the guide block radially penetrates through the guide groove and is connected with the guide seat;
the telescopic rod penetrates through an axial center hole formed in the guide seat, the telescopic rod and the guide seat can axially slide relative to each other, and the lower end of the telescopic rod is connected with the sealed mushroom head.
Furthermore, a pre-tightening spring 9 is sleeved on the telescopic rod, the lower end of the pre-tightening spring props against the sealed mushroom head, and the upper end of the pre-tightening spring props against the guide seat; the lower end of the telescopic rod is provided with a guide head type retaining ring, and the outer diameter of the retaining ring is larger than the axial center hole of the guide seat.
Furthermore, an axial flow guide hole is formed in the guide seat.
Furthermore, the upper end face of the sealing cover pressing cap is limited by a limiting table arranged on the inner wall of the nozzle sleeve.
Further, the lower end of the nozzle sleeve is connected with the outer sleeve 1.
Further, the lower end of the connecting joint is connected with the inner spray pipe 2.
The outer sleeve 1 is connected with the nozzle sleeve 17 through threads, sealing is established through an O-shaped ring, the inner spray pipe 2 is connected to the connecting joint 3 through threads, the connecting joint 3 is connected with the erosion-resistant sealing seat 5 through threads, the connecting joint 3 is sleeved into the central pipe 6 and is fixed with the limiting connecting joint 3 through the threaded connection pressing cap 4, and sealing is established among the connecting joint 3, the central pipe 6 and the erosion-resistant sealing seat 5 through the O-shaped ring. The control spring 7 and the sealing cover 11 are sequentially sleeved outside the central tube from top to bottom, the telescopic rod 10 is inserted into the guide seat 13, the pre-tightening spring 9 is sleeved at the lower end of the telescopic rod 10, the sealing mushroom head 8 is connected in a threaded manner, the guide seat 13 is inserted into the central tube 6 after the connection is completed, a key groove for installing the guide block 12 is milled on the surface of the guide seat 13, the guide block 12 penetrates through a guide groove in the central tube 6 and is arranged in the key groove of the guide seat 13, the sealing cover pressing cap 14 and the sealing cover pressing cap 14 are connected in a threaded manner, the guide block 12 is embedded in the key groove, and the movement of the three is connected together. The wear-resistant inner nozzle 16 is in threaded connection with the central pipe 6, the central pipe 6 is sleeved into the nozzle sleeve 17, the nozzle sleeve 17 is in threaded connection with the wear-resistant outer nozzle 15, and the nozzle sleeve 17, the sealing cover 11 and the sealing cover pressing cap 14 establish sealing through O-shaped rings.
The mechanism can change the flowing direction of fluid in the mechanism by means of the up-and-down movement of the central pipe 6, thereby forming two fluid circulation modes of external circulation and internal circulation of the mechanism.
As shown in figure 1, in an initial state, a control spring 7 is in a compressed state, pretightening force is generated on a sealing cover 11 and a sealing cover pressing cap 14, the sealing cover 11 and the sealing cover pressing cap 14 are limited by a nozzle sleeve 17, an embedded guide block 12 is connected with a guide seat 13 to be in the lowest end position, an inner flow channel plug composed of a telescopic rod 10 and a sealing mushroom head 8 is sleeved in the guide seat 13, and the inner flow channel plug and an erosion-resistant sealing seat 5 form contact sealing under the action of the pretightening spring 9. The fluid cannot pass through the erosion-resistant seal 5 and thus flows out through the outer flow channel of the wear-resistant inner nozzle 16 arranged on the central tube 6 and the wear-resistant outer nozzle 15 arranged on the nozzle sleeve 17, and an outer flow channel circulation is formed by this mechanism.
As shown in figure 2, a novel variable double-runner sand washing mechanism, under the condition that a runner is changed, a central pipe 6 moves downwards, under the pushing of a control spring 7, a sealing cover 11 and a sealing cover pressing cap 14 move upwards relatively, so that a guide block 12 embedded in the sealing cover pressing cap is driven to move upwards along a central pipe guide groove, the sealing cover 11 and the sealing cover pressing cap 14 move upwards while a wear-resistant inner nozzle 16 is closed so as to close an outer runner, a guide seat 13 is driven to move upwards together, the guide seat 13 moves while being driven to move upwards by the guide 13 due to the fact that the upper end of a telescopic rod 10 is thickened, an inner runner plug composed of the telescopic rod 10 and a sealing mushroom head 8 leaves an erosion-resistant sealing seat 5 so as to remove sealing, the inner runner is opened, and fluid can flow into an inner spray pipe 2 through the erosion-resistant sealing seat 5 to form inner runner circulation.
The jet flow is sprayed out from different flow channels through the structure, the sand washing jet flow effect is improved, the success rate of sand washing operation can be further improved, meanwhile, the flow channel steering mechanism can also be used as a steering mechanism in other well washing tools, gravel filling tools and other tools needing to be provided with the flow channels in a switching mode, and different construction process requirements are met through different circulating flow channels.
Example 2:
referring to fig. 1 to 3, the present invention provides a technical solution:
a variable double-flow-passage sand washing mechanism comprises a nozzle sleeve 17, an internal switch and an external switch;
the external switch is a central pipe 6, the central pipe is positioned inside the nozzle pipe, and the internal switch is arranged on the central pipe;
the nozzle sleeve is provided with a radial outer spray hole, the inner wall of the nozzle sleeve is provided with an inner annular groove, and the outer spray hole is communicated with the inner annular groove;
the central tube is provided with a radial inner spray hole, the outer wall of the central tube is provided with an outer annular groove, and the inner spray hole is communicated with the outer annular groove;
the internal through switch can plug a channel in the central tube in an initial state, and meanwhile, an inner ring groove of the nozzle sleeve is communicated with an outer ring groove of the central tube to realize external circulation;
when the central tube moves downwards, the internal through switch can open a channel in the central tube, and meanwhile, the central tube moves downwards to enable the inner ring groove and the outer ring groove to axially slide and be plugged in a staggered mode, so that internal circulation is achieved.
Further, a wear-resistant outer nozzle 15 is installed in the outer spray hole, and a wear-resistant inner nozzle 16 is installed in the inner spray hole.
Furthermore, the inner switch comprises a connecting joint 3, a pressing cap 4, an erosion-resistant sealing seat 5, a sealing mushroom head 8 and a follow-up guide mechanism;
the erosion-resistant sealing seat is arranged on the inner wall of the upper port of the connecting joint, is the same as the connecting joint and is of an axially through structure, and an inner conical hole is formed in the inner wall of the upper port of the erosion-resistant sealing seat;
the connecting joint is pressed and fixed at the lower end port of the central tube through a pressing cap;
the outer mushroom spherical surface of the sealing mushroom head corresponds to the inner conical hole of the upper end opening of the erosion-resistant sealing seat and can seal the inner conical hole;
the follow-up guide mechanism is installed on the central pipe and connected with the sealing mushroom head.
Example 3:
referring to fig. 1 to 3, the present invention provides a technical solution:
a variable double-flow-passage sand washing mechanism comprises a nozzle sleeve 17, an internal switch and an external switch;
the external switch is a central pipe 6, the central pipe is positioned inside the nozzle pipe, and the internal switch is arranged on the central pipe;
the nozzle sleeve is provided with a radial outer spray hole, the inner wall of the nozzle sleeve is provided with an inner annular groove, and the outer spray hole is communicated with the inner annular groove;
the central pipe is provided with a radial inner spray hole, the outer wall of the central pipe is provided with an outer ring groove, and the inner spray hole is communicated with the outer ring groove;
the internal through switch can plug a channel in the central tube in an initial state, and meanwhile, an inner ring groove of the nozzle sleeve is communicated with an outer ring groove of the central tube to realize external circulation;
when the central tube moves downwards, the internal through switch can open a channel in the central tube, and meanwhile, the central tube moves downwards to enable the inner ring groove and the outer ring groove to axially slide and be plugged in a staggered mode, so that internal circulation is achieved.
Further, a wear-resistant outer nozzle 15 is installed in the outer spray hole, and a wear-resistant inner nozzle 16 is installed in the inner spray hole.
Although fig. 1 to 3 are used in all the above embodiments, it is obvious to those skilled in the art that a separate drawing is not shown, as long as the parts or structural features missing in the embodiments are removed from the drawings or replaced with other modified structures. As will be clear to the skilled person. Of course, the embodiment with more specific structural features is only the best embodiment, and the embodiment with less specific features is the basic embodiment, but the basic object of the present invention can also be achieved, so all the modified embodiments are within the protection scope of the present invention.
All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. 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," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 invention. In this specification, the schematic representations of the terms used above 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 a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement 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 variable double-flow-channel sand washing mechanism is characterized by comprising a nozzle sleeve, an inner through switch and an outer through switch;
the external through switch is a central pipe, the central pipe is positioned inside the nozzle pipe, and the internal through switch is arranged on the central pipe;
the nozzle sleeve is provided with a radial outer spray hole, the inner wall of the nozzle sleeve is provided with an inner annular groove, and the outer spray hole is communicated with the inner annular groove;
the central tube is provided with a radial inner spray hole, the outer wall of the central tube is provided with an outer annular groove, and the inner spray hole is communicated with the outer annular groove;
the internal through switch can block a channel in the central tube in an initial state, and meanwhile, the inner annular groove of the nozzle sleeve is communicated with the outer annular groove of the central tube, so that external circulation is realized;
when the central tube moves downwards, the internal through switch can open a channel in the central tube, and meanwhile, the central tube moves downwards to enable the inner ring groove and the outer ring groove to axially slide and be plugged in a staggered mode, so that internal circulation is achieved.
2. The variable dual-flow-channel sand washing mechanism as claimed in claim 1, wherein a wear-resistant outer nozzle is installed in the outer nozzle hole, and a wear-resistant inner nozzle is installed in the inner nozzle hole.
3. The variable double-flow-passage sand washing mechanism as claimed in claim 1 or 2, wherein the internal through switch comprises a connecting joint, a pressing cap, an erosion-resistant sealing seat, a sealing mushroom head and a follow-up guide mechanism;
the erosion-resistant sealing seat is arranged on the inner wall of the upper port of the connecting joint, is the same as the connecting joint and is of an axially through structure, and an inner conical hole is formed in the inner wall of the upper port of the erosion-resistant sealing seat;
the connecting joint is pressed and fixed at the lower end port of the central tube through a pressing cap;
the outer mushroom spherical surface of the sealing mushroom head corresponds to the inner conical hole of the upper end opening of the erosion-resistant sealing seat and can seal the inner conical hole;
the follow-up guide mechanism is installed on the central pipe and connected with the sealing mushroom head.
4. The variable double-flow-passage sand washing mechanism as claimed in claim 3, wherein the follow-up guide mechanism comprises a control spring, a telescopic rod, a sealing cover, a guide block, a guide seat and a sealing cover pressing cap;
the sealing cover is sleeved on the outer wall of the central pipe, the inner wall of the sealing cover and the outer wall of the central pipe are in sliding seal, and the outer wall of the sealing cover and the inner wall of the nozzle sleeve are in sliding seal;
the upper end of the control spring is connected with the lower end face of the sealing cover, and the lower end of the control spring is connected with a shoulder arranged on the outer wall of the central tube;
the guide block is arranged on a circular table on the inner wall of the sealing cover, the sealing cover pressing cap is arranged at the upper end port of the sealing cover and can tightly press the guide block, and the inner wall of the sealing cover pressing cap and the outer wall of the central pipe are in sliding seal;
the guide seat is positioned in the central tube, the central tube is provided with an axial guide groove, and the guide block radially penetrates through the guide groove and is connected with the guide seat;
the telescopic rod penetrates through an axial center hole formed in the guide seat, the telescopic rod and the guide seat can axially slide relative to each other, and the lower end of the telescopic rod is connected with the sealing mushroom head.
5. The variable double-flow-channel sand washing mechanism is characterized in that a pre-tightening spring is sleeved on the telescopic rod, the lower end of the pre-tightening spring abuts against the sealing mushroom head, and the upper end of the pre-tightening spring abuts against the guide seat; the lower end of the telescopic rod is provided with a guide head type retaining ring, and the outer diameter of the retaining ring is larger than the axial center hole of the guide seat.
6. The variable double-flow-passage sand washing mechanism as claimed in claim 4, wherein the guide seat is further provided with an axial guide hole.
7. The variable double-flow-passage sand washing mechanism as claimed in claim 4, wherein the upper end surface of the sealing gland pressing cap is limited by a limit table arranged on the inner wall of the nozzle sleeve.
8. A variable dual flow sand wash mechanism according to claim 4, 5 or 6, wherein the lower end of the nozzle sleeve is connected to an outer sleeve.
9. The variable dual-flow sand washing mechanism as claimed in claim 4, 5 or 6, wherein the lower end of the connecting joint is connected with the inner nozzle.
10. The use method of the variable double-flow-channel sand washing mechanism is characterized by comprising the following steps of:
in an initial state, the control spring is in a compressed state, pretightening force is generated on the sealing cover and the sealing cover pressing cap, the sealing cover and the sealing cover pressing cap are limited by the nozzle sleeve, at the moment, the embedded guide block is connected with the guide seat and is positioned at the lowest end position, an inner runner plug consisting of a telescopic rod and a sealing mushroom head is sleeved in the guide seat, contact sealing is formed between the guide seat and the erosion-resistant seal seat under the action of the pretightening spring, fluid cannot pass through the erosion-resistant seal seat, and accordingly flows outwards through an outer runner passage of the wear-resistant inner nozzle arranged on the central pipe and the wear-resistant outer nozzle arranged on the nozzle sleeve, and outer runner circulation is formed through the mechanism, so that outer circulation sand washing is realized;
under the runner change state, the center tube moves downwards, under the promotion of control spring, sealed lid and sealed lid press the relative upward motion of cap, thereby drive the guide block that imbeds wherein and upwards move along the center tube guide way, sealed lid presses the cap to close wear-resisting inner nozzle when upwards moving with sealed lid thereby close outer runner, thereby drive guide holder simultaneous upward movement, the guide holder motion is simultaneously because the telescopic link upper end adds thick, can be guided and drive upward movement together, the inner runner end cap that comprises telescopic link and sealed mushroom head at this moment leaves the seal receptacle of nai erosion thereby removing sealedly, the inner runner is opened, fluid accessible is able to be able to flow into the inner spray tube and form the inner runner circulation, realize the inner loop sand washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011121692.7A CN114439401A (en) | 2020-10-19 | 2020-10-19 | Variable double-flow-channel sand washing mechanism and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011121692.7A CN114439401A (en) | 2020-10-19 | 2020-10-19 | Variable double-flow-channel sand washing mechanism and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114439401A true CN114439401A (en) | 2022-05-06 |
Family
ID=81358138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011121692.7A Pending CN114439401A (en) | 2020-10-19 | 2020-10-19 | Variable double-flow-channel sand washing mechanism and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114439401A (en) |
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2020
- 2020-10-19 CN CN202011121692.7A patent/CN114439401A/en active Pending
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