CN210049870U - Hydraulic control constant pressure backwashing valve - Google Patents
Hydraulic control constant pressure backwashing valve Download PDFInfo
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- CN210049870U CN210049870U CN201920877718.7U CN201920877718U CN210049870U CN 210049870 U CN210049870 U CN 210049870U CN 201920877718 U CN201920877718 U CN 201920877718U CN 210049870 U CN210049870 U CN 210049870U
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Abstract
The utility model provides a hydraulic control constant pressure backwash valve, which relates to the technical field of oil field exploitation equipment and comprises an outer barrel and a sealing pipe positioned in the outer barrel, wherein the outer barrel is connected with the sealing pipe in a sealing way, and an annular space is formed between the outer barrel and the sealing pipe; a first liquid through port communicated with the annular space is formed in the outer barrel, and a rupture disc capable of being crushed is arranged in the first liquid through port; a second liquid through port communicated with the annular space is formed in the sealing pipe, a first blocking piece capable of blocking a channel between the second liquid through port and the first liquid through port is arranged between the outer barrel and the sealing pipe, and a first resetting piece driving the first blocking piece to reset is arranged between the first blocking piece and the lower connector; the sealing pipe is internally provided with a second plugging piece capable of sealing the second liquid through hole, and the sealing pipe is internally provided with a second resetting piece for driving the second plugging piece to reset. The technical effect that the oil well can work normally is achieved.
Description
Technical Field
The utility model relates to an oil field exploitation equipment technical field particularly, relates to liquid accuse level pressure backwash valve.
Background
With the continuous progress and development of oil field development technology, the oil casing is protected during production and water injection, so that the oil casing annulus is isolated from the oil pipe, in particular to a water injection well and a gas well. The sealing performance of the oil pipe must be ensured during production and water injection, otherwise, the corrosion and well control risks of the oil-gas well and the water injection well to the sleeve are greatly damaged. The backwash valves in the prior art mostly adopt a sliding sleeve type, a two-way structure and the like, the backwash valves in the above forms have the condition that the pressure of a sleeve exists in the application process, and the above products can not meet the requirements of the prior production and water injection along with the continuous updating and continuous improvement of the oil-gas well development technology.
The mechanical structure of the sliding sleeve type backwashing valve or the double-body structure backwashing valve cannot be reliably sealed underground, and the pressure value is unstable during circulating well killing. No matter the slide sleeve type backwashing valve or the double-through structure backwashing valve is produced and injected with water for a period of time, the oil sleeve annulus is pressed, and the sealing is invalid. At this time, if production and water injection operations are continued, there is a risk of well control, and therefore, production or water injection has to be stopped to perform workover operations to inspect the pipe string and replace the backwash valve.
Therefore, it is an important technical problem to be solved by those skilled in the art to provide a hydraulic control constant pressure backwash valve which can enable the oil field to be normally exploited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulically controlled constant pressure backwash valve to alleviate among the prior art because of the poor technical problem who leads to the unable normal exploitation in oil field of hydraulically controlled constant pressure backwash valve leakproofness.
The embodiment of the utility model provides a hydraulic control constant pressure backwash valve, including urceolus and the sealed tube that is located the urceolus inside, the urceolus with the sealed tube sealing connection, and there is annular space between the urceolus and the sealed tube;
one ends of the outer barrel and the sealing pipe are hermetically connected with the upper joint, and the other ends of the outer barrel and the sealing pipe are hermetically connected with the lower joint;
a first liquid through hole for communicating the annular space with the outside is formed in the outer barrel, and a rupture disc capable of being crushed is arranged on the first liquid through hole;
a second liquid through hole for communicating the sealing pipe with the annular space is formed in the sealing pipe, a first blocking piece capable of blocking a channel between the second liquid through hole and the first liquid through hole is arranged between the outer barrel and the sealing pipe, and a first resetting piece for driving the first blocking piece to reset is arranged between the outer barrel and the sealing pipe;
the sealing pipe is internally provided with a second plugging piece capable of sealing a second liquid through hole, and the sealing pipe is internally provided with a second resetting piece for driving the second plugging piece to reset.
The embodiment of the present invention provides a first possible implementation manner, wherein the sealing pipe includes a first sealing pipe, a connection joint, and a second sealing pipe, which are sequentially connected from top to bottom;
the top of the first sealing tube is connected with the upper joint in a sealing manner, and the bottom of the second sealing tube is connected with the lower joint in a sealing manner.
The embodiment of the present invention provides a second possible implementation manner, wherein the second plugging member employs a second piston, and the second piston includes a piston cylinder and a sealing convex ring fixedly disposed on an outer wall of the piston cylinder;
a fixing cap is fixedly arranged at the bottom of the second sealing tube, one end of the second resetting piece is abutted against the fixing cap, and the other end of the second resetting piece is abutted against the bottom of the sealing convex ring;
the sealing convex ring is in sliding sealing with the inner wall of the second sealing pipe.
In a third possible implementation manner provided by the embodiment of the present invention, the sealing convex ring is provided with sealing rings along two axial ends thereof, wherein the sealing rings are sealed with the second sealing pipe;
the driving convex ring is fixedly arranged on the outer wall of the sealing convex ring, and the driving convex ring is positioned below the second liquid through port.
The embodiment of the utility model provides a fourth possible implementation mode, wherein, above-mentioned piston cylinder with sealed bulge loop formula structure as an organic whole.
The embodiment of the present invention provides a fifth possible implementation manner, wherein the outer cylinder includes a sliding sleeve and a spring cylinder which are sequentially connected from top to bottom;
the sliding sleeve is connected with the spring barrel in a sealing mode.
The embodiment of the present invention provides a sixth possible implementation manner, wherein the first plugging member adopts a first piston; one end of the first resetting piece is abutted against the bottom end of the first piston, and the other end of the first resetting piece is abutted against the top of the lower joint;
the first piston is abutted against the bottom of the sliding sleeve under the action of the first resetting piece.
The embodiment of the present invention provides a seventh possible implementation manner, wherein the first liquid passing hole is a stepped hole;
a pressure cap used for locking the rupture disc is fixedly arranged in the first liquid through hole;
a sealing gasket is arranged between the rupture disc and the step of the first liquid through port, and a sealing gasket is arranged between the rupture disc and the pressing cap;
the pressure cap is in threaded connection with the first liquid through port.
The embodiment of the utility model provides an eighth possible implementation, wherein, above-mentioned first piece that resets with the second resets and all adopts the spring.
The embodiment of the present invention provides a ninth possible implementation manner, wherein the hydraulic control constant pressure backwashing valve further comprises an upper joint and a lower joint;
the urceolus with the sealed tube both one end all with top connection sealing connection, the other end all with lower clutch sealing connection.
Has the advantages that:
the embodiment of the utility model provides a hydraulic control constant pressure backwash valve, which comprises an outer cylinder and a sealing pipe positioned inside the outer cylinder, wherein the outer cylinder is connected with the sealing pipe in a sealing way, and an annular space is formed between the outer cylinder and the sealing pipe; a first liquid through port communicated with the annular space is formed in the outer barrel, and a rupture disc capable of being crushed is arranged in the first liquid through port; a second liquid through port communicated with the annular space is formed in the sealing pipe, a first blocking piece capable of blocking a channel between the second liquid through port and the first liquid through port is arranged between the outer barrel and the sealing pipe, and a first resetting piece driving the first blocking piece to reset is arranged between the first blocking piece and the lower connector; the sealing pipe is internally provided with a second plugging piece capable of sealing the second liquid through hole, and the sealing pipe is internally provided with a second resetting piece for driving the second plugging piece to reset.
When backwashing is not needed, the staff do not pressurize the rupture disc, so that the rupture disc is not broken; the second liquid through port is sealed through the second plugging piece, so that a first seal during production and water injection is formed, and oil in the sealing pipe is prevented from passing through the second liquid through port; a channel between the first liquid through port and the second liquid through port is plugged through the first plugging piece, a second seal for production and water injection is formed, and oil in the sealing pipe is prevented from flowing to the first liquid through port from the second liquid through port; finally, the first liquid through port is sealed through the rupture disc to form a third seal during production and water injection, so that oil in the seal pipe is prevented from flowing out of the first liquid through port; therefore, leakage of the hydraulic control constant-pressure backwashing valve is avoided, the annular pressure of the oil sleeve is not seen, and the oil well is prevented from stopping working normally due to the hydraulic control constant-pressure backwashing valve.
When backwashing is carried out, a worker presses the annular space between the backwashing valve and the oil well casing pipe, the rupture disc at the first liquid through port is broken through the pressure of backwashing liquid, then the backwashing liquid enters the outer barrel, and then the annular space between the outer barrel and the sealing pipe is filled; then, the worker continues to press, so that the backwash liquid can push the first blocking piece to overcome the elastic force of the first resetting piece to move downwards, and the backwash liquid can enter the second liquid through hole; then the staff continues to suppress to liquid pressure changes along with the time (for example, pulse pressure) for backwash liquid can drive the motion of second shutoff piece, thereby makes second liquid vent unblocked, and backwash liquid can enter into the sealed tube inside, accomplishes the backwash work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a cross-sectional view of the overall structure of a hydraulically controlled constant pressure backwash valve provided in an embodiment of the present invention;
fig. 2 is a sectional view of the upper structure of a second piston in a hydraulic control constant pressure backwash valve provided by the embodiment of the invention;
FIG. 3 is an enlarged schematic view at A in FIG. 1;
FIG. 4 is an enlarged schematic view at B of FIG. 1;
FIG. 5 is a cross-sectional view of the upper structure of a hydraulic control constant pressure backwash valve provided in the embodiment of the present invention;
FIG. 6 is a cross-sectional view of the middle structure of a hydraulic control constant pressure backwash valve provided in the embodiment of the present invention;
fig. 7 is a cross-sectional view of the lower structure of the hydraulic control constant pressure backwash valve provided by the embodiment of the invention.
Icon: 100-upper joint; 200-lower joint;
300-outer cylinder; 310-a sliding sleeve; 311-a first liquid through port; 312-a rupture disc; 313-pressing the cap; 314-a sealing gasket; 320-a spring cartridge; 330-annular space;
400-sealing the tube; 410-a first sealed tube; 420-connecting a joint; 430-a second sealed tube; 431-a second liquid through port; 432-a locking cap;
500-a first piston; 510-a first reset piece;
600-a second piston; 610-a second reset piece; 620-piston cylinder; 630-sealing convex ring; 640-driving the convex ring.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Referring to fig. 1 to 7, an embodiment of the present invention provides a hydraulically controlled constant pressure backwash valve, which includes an outer cylinder 300 and a sealing pipe 400 located inside the outer cylinder 300, wherein the outer cylinder 300 is hermetically connected to the sealing pipe 400, and an annular space 330 is present between the outer cylinder 300 and the sealing pipe 400; a first liquid through hole 311 for communicating the annular space 330 with the outside is formed in the outer cylinder 300, and a rupture disc 312 capable of being crushed is arranged on the first liquid through hole 311; a second liquid through opening 431 for communicating the sealing tube 400 with the annular space 330 is formed in the sealing tube 400, a first piston 500 capable of plugging a channel between the second liquid through opening 431 and the first liquid through opening 311 is arranged between the outer cylinder 300 and the sealing tube 400, and a first reset piece 510 for driving the first piston 500 to reset is arranged between the outer cylinder 300 and the sealing tube 400; the second piston 600 capable of sealing the second liquid passage 431 is disposed in the sealing tube 400, and the second returning member 610 for returning the second piston 600 is disposed in the sealing tube 400.
When in use, the hydraulic control constant pressure backwashing valve provided by the embodiment is descended into an oil well casing.
When backwashing is not needed, the worker does not pressurize the rupture disc 312 to crush the rupture disc; the second liquid through hole 431 is sealed by the second piston 600 to form a first seal during production and water injection, so that oil in the sealing pipe 400 is prevented from passing through the second liquid through hole 431; the first piston 500 is used for blocking a channel between the first liquid through port 311 and the second liquid through port 431 to form a second channel for production and water injection, so that oil in the sealing pipe 400 is prevented from flowing to the first liquid through port 311 from the second liquid through port 431; finally, the first liquid through hole 311 is sealed through the rupture disc 312 to form a third seal during production and water injection, so that oil in the sealing pipe 400 is prevented from flowing out of the first liquid through hole 311; therefore, leakage of the hydraulic control constant-pressure backwashing valve is avoided, the annular pressure of the oil sleeve is not seen, and the oil well is prevented from stopping working normally due to the hydraulic control constant-pressure backwashing valve.
When backwashing is not needed, the sealing pipe 400 is sealed through three layers of seals, and leakage of the sealing pipe 400 is avoided.
Referring to fig. 1, when backwashing, a worker presses the annulus between an oil pipe (a backwashing valve) and an oil well casing, crushes the rupture disc 312 at the first liquid through hole 311 by the pressure of backwashing liquid, then the backwashing liquid enters the outer cylinder 300 (the sliding sleeve 310), and then fills the annular space 330 between the outer cylinder 300 (the sliding sleeve 310 and the spring cylinder 320) and the sealing pipe 400 (the first sealing pipe 410, the connecting joint 420 and the second sealing pipe 430); then, the worker continues to press the pressure, so that the backwash liquid can push the first piston 500 to move downwards against the elastic force of the first resetting member 510, and the backwash liquid can enter the second liquid through hole 431; the pressure is then continued by the operator and the pressure of the liquid is varied over time (e.g., a pulse pressure) so that the backwash liquid can drive the second piston 600 to move, thereby freeing the second vent 431 and allowing backwash liquid to enter the interior of the gland 400.
It should be noted that the backwash valve provided in this embodiment is lowered into the well together with an upper completion tool such as an electric submersible pump or is lowered into the well together with the distributor string.
For example, when the backwash valve and an upper completion tool such as an electric submersible pump are simultaneously lowered, the backwash valve is connected to the uppermost end of the production string, and during production, if downhole pressure is abnormal, reverse circulation of high-density liquid can be performed to perform circulation well killing and operation of closing a production sliding sleeve by a lowering tool, so that production safety is ensured, and well control risks are reduced. When the backwash valve is as the pilot-controlled constant pressure backwash valve in the water injection tubular column, then connect this even backwash valve in the water injection tubular column upper end, tubular column water injection pressure is higher when the water injection, keeps apart oil pipe and oil jacket annular space through setting up three sealedly, ensures sealed reliability. When water is injected, the bottom pressure is abnormal, the circulating high-density liquid killing well can be carried out, and the three layers of circulation channels are opened for circulating killing well. And after the well killing is finished, the circulating channel is closed, and water injection operation construction can be continuously carried out. And a blending tool can be put into the water injection operation process to blend the underground water distributor, so that refined water injection operation is realized.
It should be noted that the first and second returning members 510 and 610 may be springs, the first returning member 510 is located between the first piston 500 and the lower connector 200, and the second returning member 610 is located between the fixed cap 432 and the second piston 600.
It should be noted that both the outer cylinder 300 and the sealing tube 400 have one end sealingly connected to the upper joint 100 and the other end sealingly connected to the lower joint 200.
In an alternative of this embodiment, the sealing tube 400 includes a first sealing tube 410, a connection joint 420, and a second sealing tube 430 connected in sequence; the top of the inner sealed tube is sealingly connected to the upper joint 100 and the bottom of the second sealed tube 430 is sealingly connected to the lower joint 200.
In an alternative of this embodiment, the bottom of the first sealing tube 410 is sealingly connected to the connection joint 420, and the top of the second sealing tube 430 is sealingly connected to the connection joint 420.
Specifically, the top outer wall of the first sealing pipe 410 is hermetically connected with the bottom inner wall of the upper joint 100, and the bottom outer wall of the first sealing pipe 410 is hermetically connected with the top inner wall of the connecting joint 420; the top inner wall of the second sealing pipe 430 is screwed with the bottom outer wall of the connection joint 420, and the bottom outer wall of the second sealing pipe 430 is hermetically connected with the top inner wall of the lower joint 200. When the lower joint 200 is installed, the lower joint 200 pushes the second sealing tube 430 to tightly abut the second sealing tube 430 against the lower joint 200, and the second sealing tube 430 pushes the connection joint 420 to move to tightly abut the top of the connection joint 420 against the bottom of the first sealing tube 410 and tightly abut the top of the first sealing tube 410 against the bottom of the upper joint 100.
In an alternative of this embodiment, the second piston 600 includes a piston cylinder 620 and a sealing collar 630; a fixed cap 432 is fixedly arranged at the bottom of the second sealing tube 430, one end of the second resetting piece 610 is abutted against the fixed cap 432, and the other end is abutted against the bottom of the sealing convex ring 630; the sealing protrusion ring 630 is slidably sealed with the inner wall of the second sealing pipe 430.
Referring to fig. 2 and 4, in an alternative of the present embodiment, the sealing convex ring 630 is provided with sealing rings along both ends in the axial direction thereof to seal with the second sealing pipe 430; the second liquid through port 431 is positioned between the two sealing rings; a driving convex ring 640 for driving the sealing convex ring 630 to move is arranged between the two sealing rings, and the driving convex ring 640 is positioned below the second liquid through opening 431.
Specifically, when backwashing is performed, the liquid entering the outer cylinder 300 from the first liquid passage 311 drives the first piston 500 to move, so that the liquid enters the second liquid passage 431, then the liquid in the second liquid passage 431 flows between the second piston 600 and the second sealing pipe 430, and then the liquid drives the second piston 600 to move through the driving convex ring 640 along with the change of the liquid pressure, so that the second piston 600 moves downward, the second liquid passage 431 is unblocked, and the liquid outside the outer cylinder 300 enters the second sealing pipe 430.
It should be noted that the pressure of the liquid is changed with time and the change range is large, when the pressure of the liquid reaches the maximum, the second returning member 610 can be pressed instantly, and it is determined that the second piston 600 moves downwards rapidly, so that the second piston 600 does not block the second liquid through hole 431 any more.
It should also be noted that the liquid between the pipe sleeve and the outer cylinder 300 is pressurized by the operator outside the oil well to crack the crushing disc, and when the liquid enters the outer cylinder 300, the pressure of the liquid is changed back and forth in a short time, and when the pressure of the liquid reaches the maximum, the liquid can push the driving convex ring 640 to move downwards quickly, so as to drive the second piston 600 to move downwards quickly, so that the second liquid through opening 431 is unblocked. And, the maximum hydraulic pressure will quickly push the driving collar 640 to move, so that the second piston 600 will be completely located below the second liquid through hole 431.
When backwashing is carried out, only the working personnel are needed to press at the wellhead, and the pipe column tool cannot be put down for on-off control. After backwashing, the first reset piece 510 can drive the first piston 500 to reset, and the second reset piece 610 can drive the second piston 600 to reset, so that two sealing protections are formed; alternatively, the worker may lift the backwash valve and replace the breaker disc to form three seals.
In an alternative of this embodiment, the piston cylinder 620 and the sealing collar 630 are of a unitary construction.
In an alternative of this embodiment, the outer cartridge 300 includes a sliding sleeve 310 and a spring cartridge 320; the bottom outer wall of the sliding sleeve 310 is sealingly connected to the top inner wall of the spring cartridge 320.
Specifically, the top inner wall of the sliding sleeve 310 is in threaded connection with the bottom outer wall of the upper joint 100, and a sealing ring is arranged between the two; the bottom outer wall of the sliding sleeve 310 is threadedly coupled with the top interior of the spring cartridge 320 with a seal ring disposed therebetween.
The bottom inner wall of the sliding sleeve 310 is in threaded connection with the top outer wall of the lower joint 200, and a sealing ring is arranged between the two.
When the backwashing valve is assembled, the spring cylinder 320 is connected with the lower connector 200, and then the first resetting piece 510 and the first piston 500 are installed; then, the second sealing tube 430 is installed (the bottom of the second sealing tube 430 is screwed with the fixing cap 432 before being installed, and the top is screwed with the connection joint 420), and then the second restoring member 610 and the second piston 600 are installed; then the top of the spring cylinder 320 is connected with the sliding sleeve 310 in a threaded mode; a first sealing pipe 410 is arranged at the top of the connecting joint 420; finally, the upper joint 100 is installed, and the upper joint 100 is in threaded connection with the spring cylinder 320; during the tightening of the upper fitting 100 to the spring cartridge 320, the upper fitting 100 compresses the first sealing tube 410, thereby tightly abutting the second sealing tube 430 against the lower fitting 200.
In an alternative of the present embodiment, one end of the first restoring member 510 abuts against the bottom end of the first piston 500, and the other end abuts against the top of the lower connector 200; the first piston 500 abuts against the bottom of the sliding sleeve 310 by the first restoring member 510.
Referring to fig. 3, in an alternative of the present embodiment, the first liquid passage 311 is a stepped hole; a pressing cap 313 for locking the disc is fixedly arranged in the first liquid through hole 311; a sealing gasket 314 is arranged between the rupture disk 312 and the step of the first liquid through opening 311, and the sealing gasket 314 is arranged between the rupture disk 312 and the pressing cap 313.
In an alternative of this embodiment, the pressing cap 313 is screwed with the first liquid passage 311.
When the rupture disk 312 is installed, the sealing washer 314 is placed into the first liquid inlet 311, then the rupture disk 312 is placed, then the sealing washer 314 is placed, and then the pressing cap 313 is screwed down to press the rupture disk 312 tightly, so that the first liquid inlet 311 is prevented from leaking.
It should be noted that the minimum inner diameter of the hydraulic control constant pressure backwash valve provided by this embodiment is the same as the inner diameter of the production string, so as to ensure that a tool can be lowered to realize separate production and separate injection during production and water injection operations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A hydraulically controlled constant pressure backwash valve, comprising: the outer barrel (300) and a sealing pipe (400) positioned inside the outer barrel (300), wherein the outer barrel (300) is connected with the sealing pipe (400) in a sealing way, and an annular space (330) exists between the outer barrel (300) and the sealing pipe (400);
a first liquid through port (311) used for communicating the annular space (330) with the outside is formed in the outer cylinder (300), and a rupture disc (312) capable of being crushed is arranged on the first liquid through port (311);
a second liquid through opening (431) used for communicating the sealing pipe (400) with the annular space (330) is formed in the sealing pipe (400), a first blocking piece capable of blocking a channel between the second liquid through opening (431) and the first liquid through opening (311) is arranged between the outer cylinder (300) and the sealing pipe (400), and a first resetting piece (510) used for driving the first blocking piece to reset is arranged between the outer cylinder (300) and the sealing pipe (400);
the sealing pipe (400) is internally provided with a second plugging piece capable of sealing a second liquid through port (431), and the sealing pipe (400) is internally provided with a second resetting piece (610) used for driving the second plugging piece to reset.
2. The hydraulically controlled constant pressure backwash valve according to claim 1, wherein the seal pipe (400) comprises a first seal pipe (410), a connecting joint (420) and a second seal pipe (430) which are connected in sequence from top to bottom;
the top of the first sealing pipe (410) is connected with the upper joint (100) in a sealing way, and the bottom of the second sealing pipe (430) is connected with the lower joint (200) in a sealing way.
3. The hydraulically controlled constant-pressure backwashing valve according to claim 2, wherein the second plugging member adopts a second piston (600), and the second piston (600) comprises a piston cylinder (620) and a sealing convex ring (630) fixedly arranged on the outer wall of the piston cylinder (620);
a fixed cap (432) is fixedly arranged at the bottom of the second sealing tube (430), one end of the second resetting piece (610) is abutted against the fixed cap (432), and the other end of the second resetting piece is abutted against the bottom of the sealing convex ring (630);
the sealing convex ring (630) is in sliding sealing with the inner wall of the second sealing pipe (430).
4. The hydraulically controlled constant pressure backwash valve as claimed in claim 3, wherein the sealing convex ring (630) is provided with sealing rings at both ends in the axial direction thereof for sliding sealing with the second sealing pipe (430);
the outer wall of the sealing convex ring (630) is fixedly provided with a driving convex ring (640), and the driving convex ring (640) is located below the second liquid through port (431).
5. A hydraulically controlled constant pressure backwash valve according to claim 3, wherein the piston cylinder (620) and the sealing collar (630) are of one-piece construction.
6. The hydraulically controlled constant pressure backwash valve as claimed in any one of claims 1 to 5, wherein the outer cylinder (300) comprises a sliding sleeve (310) and a spring cylinder (320) arranged in sequence from top to bottom;
the sliding sleeve (310) is connected with the spring cylinder (320) in a sealing mode.
7. The hydraulically controlled constant pressure backwash valve according to claim 6, wherein the first obturating member employs a first piston (500);
one end of the first resetting piece (510) is abutted against the bottom end of the first piston (500), and the other end of the first resetting piece is abutted against the top of the lower joint (200);
the first piston (500) abuts against the bottom of the sliding sleeve (310) under the action of the first resetting piece (510).
8. The hydraulically controlled constant pressure backwash valve according to any one of claims 1 to 5, wherein the first liquid passage port (311) is a stepped bore;
a pressure cap (313) used for locking the rupture disc (312) is fixedly arranged in the first liquid through port (311);
a sealing gasket (314) is arranged between the rupture disc (312) and the step of the first liquid through port (311), and the sealing gasket (314) is arranged between the rupture disc (312) and the pressing cap (313); the pressure cap (313) is in threaded connection with the first liquid through port (311).
9. A hydraulically controlled constant pressure backwash valve as in any of claims 1 to 5, characterized in that both the first return member (510) and the second return member (610) are spring loaded.
10. A hydraulically controlled constant pressure backwash valve according to any one of claims 1 to 5, further comprising an upper connector (100) and a lower connector (200);
one end of the outer cylinder (300) and one end of the sealing pipe (400) are both connected with the upper joint (100) in a sealing mode, and the other end of the outer cylinder is connected with the lower joint (200) in a sealing mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920877718.7U CN210049870U (en) | 2019-06-12 | 2019-06-12 | Hydraulic control constant pressure backwashing valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920877718.7U CN210049870U (en) | 2019-06-12 | 2019-06-12 | Hydraulic control constant pressure backwashing valve |
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| CN210049870U true CN210049870U (en) | 2020-02-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107256A (en) * | 2019-06-12 | 2019-08-09 | 天津凯雷油田技术有限公司 | Hydraulic control level pressure backwash valve |
| CN113323626A (en) * | 2020-02-28 | 2021-08-31 | 中国石油化工股份有限公司 | Differential pressure sliding sleeve and oil-gas well fracturing construction method |
-
2019
- 2019-06-12 CN CN201920877718.7U patent/CN210049870U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107256A (en) * | 2019-06-12 | 2019-08-09 | 天津凯雷油田技术有限公司 | Hydraulic control level pressure backwash valve |
| CN113323626A (en) * | 2020-02-28 | 2021-08-31 | 中国石油化工股份有限公司 | Differential pressure sliding sleeve and oil-gas well fracturing construction method |
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Effective date of registration: 20221214 Address after: 300450 Plant 12, Zone A, Junli Building Materials Market, Lingang Economic Zone, Binhai New Area, Tianjin Patentee after: Tianjin Shouzheng Technology Co.,Ltd. Address before: Room 645K28, Aviation Industry Support Center, No. 1 Baohang Road, Tianjin Pilot Free Trade Zone (Airport Economic Zone), 300,000 Tianjin Patentee before: Tianjin Kailei Oilfield Technology Co.,Ltd. |
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