CN114320195A - Reversing connector for continuous sand washing and well washing - Google Patents
Reversing connector for continuous sand washing and well washing Download PDFInfo
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- CN114320195A CN114320195A CN202210016840.1A CN202210016840A CN114320195A CN 114320195 A CN114320195 A CN 114320195A CN 202210016840 A CN202210016840 A CN 202210016840A CN 114320195 A CN114320195 A CN 114320195A
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Abstract
The invention provides a reversing joint for continuous sand washing and well washing, which comprises an outer shell and a reversing assembly, wherein the reversing assembly is arranged in the outer shell; the outer shell comprises an upper joint, an outer cylinder and a lower joint which are sequentially connected from top to bottom; the reversing assembly comprises a sealing seat, a valve core and a plurality of sealing rings; the sealing seat is arranged in the upper connector, the lower end of the valve core is provided with a spring, the spring is arranged between the valve core and the outer cylinder, and the lower end of the spring is connected with the upper end face of the lower connector; a through hole is arranged on the outer cylinder and is used as an outer through hole; a through hole is arranged on the side surface of the lower section of the valve core and is used as an inner through hole, and the diameter of the inner through hole is the same as that of the outer through hole; the valve core moves axially in the outer cylinder to realize the switching of the opening and closing of the flow passage from the upper joint to the inner cavity of the valve core and the flow passage from the outer through hole to the inner cavity of the valve core. The invention can realize continuous sand washing and well washing operation with high efficiency and high quality without stopping the pump.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, particularly relates to the technical field of continuous sand washing and well washing tools for oil and gas fields, and particularly relates to a reversing joint for continuous sand washing and well washing.
Background
During oil and gas production, sand in the formation inevitably enters the wellbore as oil and gas is produced. Wherein, part of sand grains are carried to the ground by oil gas and are deposited in pipelines and equipment; part of the sand is deposited downhole and gradually increases with production time, thereby plugging the production zone, the downhole string, etc., resulting in a decrease in hydrocarbon production. Therefore, when the downhole sand is deposited to a certain thickness, a well-flushing operation needs to be performed. The sand washing and well washing method is an important means for cleaning sand accumulated in a shaft of an oil-gas well, and sand at the bottom of the well is carried to the ground by using sand washing liquid.
When a common oil pipe is adopted for sand washing and well washing, the extension of a sand washing pipe column is realized by adopting a single connection mode. In order to avoid that sand grains in a shaft are settled due to the fact that a pump is stopped in the process of connecting a single joint, and the well washing quality and efficiency are influenced, a reversing joint, a wellhead reversing self-sealing device, a reversing valve and a circulating pipeline are used, and continuous sand washing operation is achieved. The existing reversing connector has the defects that a valve core cannot be reset due to the fact that a spring is easily clamped, the overflowing section is small, blockage is easy to occur, and the sand washing and well washing cannot be smoothly completed.
Therefore, the reversing joint for continuous sand washing and well washing overcomes the problems of spring blocking and overflowing cross section, and has great value for realizing continuous sand washing and well washing operation with high efficiency and high quality without stopping a pump.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the reversing joint for continuously washing sand and washing a well, which can realize high-efficiency and high-quality continuous sand and washing operation without stopping a pump.
The technical scheme adopted by the invention is as follows:
a reversing joint for continuous sand washing and well washing comprises an outer shell and a reversing assembly, wherein the reversing assembly is arranged in the outer shell; the outer shell comprises an upper joint, an outer cylinder and a lower joint which are sequentially connected from top to bottom; the reversing assembly comprises a sealing seat, a valve core, a spring, a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring, a sixth sealing ring, a seventh sealing ring and an eighth sealing ring; the sealing seat is arranged in the upper connector, the lower end of the valve core is provided with a spring, the spring is arranged between the valve core and the outer cylinder, the spring is connected with the lower connector, and the cylinder at the lower end of the valve core is arranged in the annular groove of the lower connector; a through hole is arranged on the outer cylinder and is used as an outer through hole; a through hole is arranged on the side surface of the lower section of the valve core and is used as an inner through hole; the diameters of the inner through hole and the outer through hole are the same, the valve core moves in the outer barrel along the axial direction, and the switching of opening and closing of the upper joint to the valve core inner cavity flow passage and the switching of opening and closing of the outer through hole to the valve core inner cavity flow passage are realized; when the inner through hole is communicated with the outer through hole and is coaxial, a flow passage from the outer through hole to the inner cavity of the valve core is opened, the valve core is in contact sealing with the sealing seat, and an upper joint is closed to the flow passage from the inner cavity of the valve core; when the inner through hole and the outer through hole are staggered, a flow channel from the outer through hole to the inner cavity of the valve core is closed, a flow channel between the valve core and the sealing seat is opened, and an upper joint is opened to the flow channel from the inner cavity of the valve core.
Preferably, the upper joint is divided into an upper part and a lower part, the lower part of the inner side of the upper joint is provided with an annular step, the circumferential direction of the annular step is provided with at least eight through holes along the axial direction, and the lower part of the upper joint is provided with an internal thread; the outer wall surface of the sealing seat is provided with an external thread, and the sealing seat is provided with a blind hole along the axial thread; the external thread of the sealing seat is connected with the internal thread at the upper part of the upper joint, and the axial relative position of the sealing seat and the upper joint thread is adjusted by rotating the sealing seat, so that the opening pressure of the valve core can be adjusted; after the rotary sealing seat reaches the designed position, the locking bolt penetrates through the through hole in the annular step of the upper joint to be connected with the thread on the sealing seat, so that the sealing seat is locked, and the sealing seat is prevented from rotating under the action of fluid impact and vibration.
Preferably, the outer side of the lower part of the upper joint is provided with an external thread and a smooth surface from top to bottom, the external thread is used for being connected with the inner side of the outer cylinder, a second sealing ring is arranged on the contact surface of the smooth surface and the outer cylinder, the inner side of the lower part of the upper joint is provided with four radial holes, the radial holes are drilled outwards from the inner side of the lower part of the upper joint close to the upper end, and axial holes which extend downwards and penetrate through the lower end face of the lower part of the upper joint are arranged in the wall; the valve core comprises an upper section, a middle section and a lower section, the upper section of the valve core is used for forming line sealing with the sealing seat, the outer diameter of the middle section of the valve core is smaller than that of the lower section of the valve core, the outer wall of the middle section of the valve core is in clearance fit with the inner wall of the lower end of the upper joint, a first sealing ring is arranged between the outer wall of the middle section of the valve core and the inner wall of the lower end of the upper joint, and a second sealing ring is arranged between the outer wall of the lower end of the valve core and the outer barrel; when the sand washing pipe column is normally lowered, the sand washing liquid is injected from the upper joint and generates a vertical downward force acting on the step surface of the valve core through the main through hole of the sealing seat; meanwhile, the sand washing liquid flows into a hydraulic cylinder formed by the valve core and the outer cylinder through the radial holes and the axial holes which are formed in the upper joint in the circumferential direction, and meanwhile, the pressure of the sand washing liquid acts on the arc-shaped surface at the top of the valve core to generate a vertical downward force which is beneficial to opening the valve core and increasing the opening degree of the valve core.
Preferably, at least two rows of balls are arranged between the valve core and the outer cylinder, the balls are embedded in the wall surface of the valve core or the outer cylinder, at least three balls are arranged in the circumferential direction of each row of balls, the coaxiality of the valve core relative to the outer cylinder is favorably improved, and the valve core and the outer cylinder form a rolling pair, so that the friction resistance of the valve core along the axial motion is reduced, and the risk of clamping the valve core is reduced.
Preferably, two threaded blind holes are formed in the circumferential direction of the middle part of the valve core, two L-shaped grooves are formed in the side face of the outer cylinder, and the pin penetrates through the L-shaped grooves in the outer cylinder to be in threaded connection with the threaded hole of the valve core; a fourth sealing ring and a fifth sealing ring are respectively arranged above and below the pin threaded hole on the valve core and the outer cylinder and used for sealing the L-shaped groove; when the valve core is stuck, acting force along the axial direction of the valve core can be applied to the pin through manual operation to drive the valve core to move in the L-shaped groove, so that the sticking is removed; the groove face on the upper side of the horizontal section of the L-shaped groove is provided with teeth, the cylindrical surface of the pin is provided with teeth meshed with the teeth on the upper groove face of the horizontal section of the L-shaped groove, and the teeth on the cylindrical surface of the pin are meshed with the teeth on the shaped groove to form self-locking, so that a channel at the valve core sealing seat is in a normally open state, and the local pressure loss and the valve core vibration of the sand washing liquid are reduced.
Preferably, as the outer through hole, a through hole arranged on the side surface of the lower section of the valve core has the same diameter as the outer through hole, and as the inner through hole, a seventh sealing ring and a sixth sealing ring for sealing with the outer cylinder are respectively arranged below and above the inner through hole; the upper end of the lower joint is provided with a section of annular sunken groove, a bottom cylinder of the valve core is arranged in the annular sunken groove, the spring is arranged between the bottom cylinder of the valve core and the outer cylinder, the upper end of the spring is tightly abutted against the step surface at the lower end of the valve core, the lower end of the spring is tightly abutted against the step surface of the lower joint, and an eighth sealing ring is arranged between the bottom cylinder of the valve core and the wall surface of the annular sunken groove of the lower joint.
The invention has the beneficial effects that:
1. the invention creatively provides a mode that the upper joint and the valve core form a hydraulic cylinder, and the driving force for opening the valve core and the opening degree of the valve core are increased by hydraulic driving, so that the risk of jamming and blocking the valve core is reduced; by adopting the mode, compared with the traditional mode of realizing opening and closing through modes such as ball throwing and the like, the use efficiency can be greatly improved, the probability of accidental blocking and other problems in the process is reduced, the cost can be saved, and the time of subsequent maintenance is reduced.
2. Through the setting to the cooperation mode of top connection and seal receptacle, make it can be convenient for adjust the mounted position, give the change for the stroke of spring and flow out the space, realize the controllability.
3. The invention forms self-locking by the engagement of the pin and the teeth on the L-shaped groove, so that the valve core compresses the spring downwards, and the flow channel from the upper joint, the valve core through hole to the inner cavity of the valve core is in a normally open state, thereby reducing the local pressure loss of the sand washing liquid and avoiding the valve core vibration and fluid impact induced by the fluid pressure and the spring force;
when the valve core is stuck due to the fact that the valve core cannot move up and down when placed for a long time or meets sundries, the pin can move in the F-shaped groove by operating the pin, so that the valve core is driven to move up and down in the outer barrel, and the stuck state of the valve core is relieved.
4. The ball is arranged between the outer barrel and the valve core, so that the outer barrel and the valve core form a rolling pair, the friction resistance of the axial movement of the valve core is effectively reduced, the risk of the valve core being stuck is reduced, the concentricity of the valve core is improved, and the internal abrasion is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
FIG. 2 is an upper detail view of FIG. 1;
FIG. 3 is a detail view of the middle of FIG. 1;
FIG. 4 is a lower detail view of FIG. 1;
FIG. 5 is a schematic diagram of the flow of the sand washing liquid in the process of connecting the sand washing pipe column to a single joint;
FIG. 6 is a schematic diagram showing the flow of the sand washing fluid during the normal lowering of the sand washing pipe string;
FIG. 7 is a schematic diagram showing the flow of the sand washing liquid in the process of connecting a sand washing pipe column to a single joint;
FIG. 8 is a schematic view showing the flow of the sand wash fluid in the present invention during normal lowering of the sand wash string;
9 a-9 c are right side views of the exterior of the outer barrel during movement of the pin with the valve core;
FIG. 10 is a schematic structural view of the upper joint;
FIG. 11 is a sectional view taken along line A-A of FIG. 10;
fig. 12 is a schematic structural view of the valve cartridge.
In the figure:
100. a reversing connector is arranged on the outer side of the shell,
1. the sealing structure comprises an upper joint, 2. a sealing seat, 3. an outer cylinder, 4. a first sealing ring, 5. a valve core, 6. a pin, 7. a ball, 8. a spring, 9. a second sealing ring, 10. a third sealing ring, 11. a fourth sealing ring, 12. a fifth sealing ring, 13. a sixth sealing ring, 14. a seventh sealing ring, 15. an eighth sealing ring, 16. a lower joint, 17. a circumferential locking bolt and 18. an L-shaped groove.
a. The valve core comprises an outer through hole, a b inner through hole, a c radial hole, a d axial hole, a e upper section top, a f main through hole, a g side hole, a h valve core inner cavity, an i thread blind hole, a j middle section outer wall of the valve core and a k valve core step surface.
Detailed Description
In the following description of the present invention, it should be noted that terms such as "upper" and "lower" are used herein only for convenience of description of the drawings, and are not intended to limit the direction in actual use, and do not necessarily require or imply any actual relationship or order between such entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus; the driving mechanisms of partial hydraulic, electric and wind power, etc. in the invention, which do not explain the concrete connection or movement mode, belong to the conventional prior art scheme.
As shown in fig. 1-12, a reversing joint for continuous sand washing and well washing comprises an outer shell and a reversing assembly, wherein the reversing assembly is arranged in the outer shell; the outer shell comprises an upper joint 1, an outer cylinder 3 and a lower joint 16 which are connected in sequence from top to bottom; the reversing assembly comprises a sealing seat 2, a valve core 5, a spring 8, a first sealing ring 4, a second sealing ring 9, a third sealing ring 10, a fourth sealing ring 11, a fifth sealing ring 12, a sixth sealing ring 13, a seventh sealing ring 14 and an eighth sealing ring 15; the sealing seat 2 is arranged in the upper joint 1, the lower end of the valve core 5 is provided with a spring 8, the spring 8 is arranged between the valve core 5 and the outer cylinder 3, and the spring 8 is connected with a lower joint 16; a through hole is formed in the outer cylinder 3 and serves as an outer through hole a, a through hole is formed in the side face of the lower section of the valve core 5 and serves as an inner through hole b, the diameter of the inner through hole b is the same as that of the outer through hole a, the valve core 5 moves in the outer cylinder 3 along the axial direction, and switching of opening and closing of a flow passage from the upper connector 1 to a valve core inner cavity h and a flow passage from the outer through hole a to the valve core inner cavity h is achieved; when the inner through hole b is communicated with the outer through hole a and is coaxial, a flow passage from the outer through hole a to the inner cavity h of the valve core is opened, the valve core 5 is in contact seal with the seal seat 2, and the flow passage from the upper joint 1 to the inner cavity h of the valve core is closed; when the inner through hole b and the outer through hole a are staggered, a flow channel from the outer through hole a to the inner cavity h of the valve core is closed, a flow channel between the valve core 5 and the sealing seat 2 is opened, and a flow channel from the upper joint 1 to the inner cavity h of the valve core is opened.
As shown in fig. 1-4, the upper joint 1 is divided into an upper part and a lower part, the upper part of the upper joint 1 is provided with an internal thread, the seal seat 2 is provided with an external thread and is mounted on the section of the internal thread of the upper joint 1, and the axial relative position of the rotary seal seat 2 and the valve core 5 is changed by rotating the seal seat 2, so that the pressure of the spring 8 is changed; the lower part of the inner side of the upper joint 1 is provided with an annular step, the circumferential direction of the annular step is provided with at least eight axial through holes, the sealing seat 2 is provided with an axial thread blind hole, and after the rotary sealing seat 2 reaches a designed position, the locking bolt 17 penetrates through the through hole on the annular step to be connected with the thread on the sealing seat 2, so that the sealing seat 2 is locked, and the sealing seat 2 is prevented from rotating under the action of fluid impact and vibration.
The outer side of the lower part of the upper joint 1 is provided with an external thread and a smooth surface from top to bottom, the external thread is used for being connected with an internal thread of the outer cylinder 3, a second sealing ring 9 is arranged between the smooth surface and a contact surface of the outer cylinder 3, the inner side of the lower part of the upper joint 1 is provided with four radial blind holes c, the radial blind holes c are outwards perforated from the inner side of the lower part of the upper joint 1 close to the upper end, and axial holes d which extend downwards and penetrate through the lower end face of the lower part of the upper joint 1 are arranged in the wall;
the valve core 5 comprises an upper section, a middle section and a lower section, the upper section of the valve core 5 is used for being matched with the sealing seat 2, the outer diameter of the middle section of the valve core 5 is smaller than that of the lower section of the valve core 5, the outer wall j of the middle section of the valve core 5 is in clearance fit with the inner wall of the lower end of the upper connector 1, a first sealing ring 4 is arranged between the outer wall b of the middle section of the valve core 5 and the inner wall of the lower end of the upper connector 1, and the lower end of the valve core 5 is provided with a cylinder structure.
The upper section of the valve core 5 is a hollow cylindrical section below the arc surface, and a through hole is formed in the side surface of the hollow cylindrical section to serve as a side hole g; a through hole corresponding to the top e of the upper section of the valve core 5 is arranged in the middle of the sealing seat 2 and serves as a main through hole f, and when the top e of the upper section of the valve core 5 contacts the edge of the main through hole f in the middle of the sealing seat 2, a flow passage from the upper joint 1 to the inner cavity h of the valve core is closed;
a section of annular groove is formed in the lower joint 16, a bottom cylinder of the valve core 5 is installed in the annular groove, the spring 8 is sleeved between the bottom cylinder of the valve core 5 and the outer cylinder 3, the upper end of the spring 8 is in contact with a step surface at the lower end of the valve core 5, the lower end of the spring 8 is tightly abutted against the end surface of the lower joint 16, and an eighth sealing ring 15 is arranged between the inner wall surface of the bottom cylinder of the valve core 5 and the wall surface of the annular groove of the lower joint 16;
the outer cylinder 3 is provided with a through hole as an outer through hole a, the lower side surface of the valve core 5 is provided with a through hole with the same diameter as that of the outer through hole a and an inner through hole b, and a seventh sealing ring 14 and a sixth sealing ring 13 for sealing with the outer cylinder 3 are respectively arranged below and above the inner through hole b.
Preferably, three rows of balls 7 are arranged between the valve core 5 and the outer cylinder 3, the balls 7 are embedded in the wall surface of the valve core 5 or the outer cylinder 3, and eight balls 7 with equal distance are preferably arranged in the circumferential direction of each row of balls 7, so that the coaxiality of the valve core 5 relative to the outer cylinder 3 is improved, and the valve core 5 and the outer cylinder 3 form a rolling pair, thereby reducing the friction resistance of the valve core 5 along the axial movement and reducing the risk of the valve core 5 being stuck.
2 threaded blind holes i are formed in the middle of the valve core 5 in the circumferential direction, two L-shaped grooves 18 are formed in the side face of the outer barrel 3, and the pin 6 penetrates through the L-shaped grooves 18 in the outer barrel 3 to be connected with the threaded blind holes i of the valve core 5 through threads; when the valve core 5 is stuck, acting force along the axial direction of the valve core 5 can be applied to the pin 6 through manual operation, the valve core 5 is driven to move in the L-shaped groove, and therefore the sticking is removed.
And a third sealing ring 10, a fourth sealing ring 11 and a fifth sealing ring 12 are respectively arranged above and below the pin thread blind hole i of the valve core 5 and the outer cylinder 3, and are used for realizing the upper and lower sealing of the valve core 5 and the outer cylinder 3 in an L-shaped groove 18.
As shown in figures 5-6, the lower joint 16 is connected with the internal thread of the upper joint of the oil pipe through threads to form a single joint, the external thread of the joint at the lower end of the oil pipe is connected with the upper joint 1 through threads to form a sand washing operation pipe column, and the sand washing operation pipe column is arranged inside the sleeve in a reversing self-sealing center manner from a wellhead.
As shown in fig. 5 and 7, an arrow represents the flowing direction of the sand washing liquid, and when a single joint is connected, the lower joint of the oil pipe is in threaded connection with the upper joint 1 of the reversing joint 100 for continuous sand washing and well washing located at the top end of a sand washing pipe column in the well, so that the single joint is connected; in the process of connecting a single, the sand washing pipeline A stops supplying sand washing liquid and releasing pressure, a top arc surface h of the valve core 5 and the wall surface of a main through hole f of the sealing seat 2 form line sealing under the action of the pressure of the spring 8, and a fluid channel cannot be formed at the position, namely a flow channel from the upper connector 1 to the inner cavity h of the valve core is closed; meanwhile, the sand washing liquid pressurized by the pump flows into a wellhead reversing self-sealing device through a reversing valve and a sand washing pipeline B, flows into an inner through hole B of the valve core 5 and an inner runner of the valve core 5, namely a valve core inner cavity h, through an annular cavity of the wellhead reversing self-sealing device and an outer through hole a of the outer cylinder 3, then enters a sand washing pipe column below, returns to the wellhead through an annular space between the sand washing pipe column and the sleeve, and flows into the sand removing device through a liquid outlet.
As shown in fig. 6 and 8, an arrow represents the flowing direction of the sand washing liquid, when the sand washing pipe column is normally lowered, the reversing joint 100 for continuous sand washing and well washing is installed at the uppermost end of the sand washing pipe column, and the upper joint 1 is connected with a sand washing pipeline a; the sand washing liquid pressurized by the pump enters the upper joint 1 through the reversing valve and the sand washing pipeline A, and the pressure of the sand washing liquid acts on the arc surface of the top e of the valve core 5 to generate a vertical downward force P1; the sand washing liquid flows into a hydraulic cylinder formed by the valve core 5 and the outer cylinder 3 through a radial hole c and an axial hole d which are arranged on the upper joint 1 in the circumferential direction and are connected with the radial hole c, and a vertical downward force P2 acting on a valve core step surface k is generated; under the action of the forces P1 and P2, the valve core 5 moves vertically and downwards along the axis direction, the spring 8 generates compression deformation, the valve core 5 is opened, the sand washing liquid enters a valve core inner cavity h of the valve core 5 through a side hole j of the valve core 5, so that the sand washing liquid enters a sand washing pipe column below, the flowback liquid which finishes the washing operation returns to a well head through an annular space between the sand washing pipe column and the sleeve, and flows into the sand removing device through a liquid outlet; meanwhile, the outer through hole a of the outer cylinder 3 is misaligned with the inner through hole b of the valve element 5, and a fluid passage cannot be formed.
As shown in fig. 9a to 9c, if the valve core 5 of the reversing joint for continuous sand washing and well washing, which is not lowered into the well, is stuck and cannot move upwards or downwards along the axis under the action of the elastic force of the spring 8 and the pressure of the sand washing liquid, manual or mechanical force can be applied to the pin 6, so that the valve core 5 is driven to move, and the normal operation of the reversing joint for continuous sand washing and well washing is realized. The top end of the pin 6 is provided with at least one protruding tooth, the upper side of the horizontal section of the L-shaped groove 18 is provided with a notch suitable for the tooth, the width of the horizontal section of the L-shaped groove 18 is matched with the height of the pin 6 with the tooth, and the width of the vertical section is matched with the width of the pin 6 without the tooth, so that the pin 6 can move smoothly in the L-shaped groove 18. The threaded hole e is matched with the pin 6, and when the pin 6 is screwed tightly, the tooth of the pin 6 is ensured to be in butt joint with the notch of the L-shaped groove 18.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A reversing joint for continuous sand washing and well washing is characterized by comprising an outer shell and a reversing assembly, wherein the reversing assembly is arranged in the outer shell; the outer shell comprises an upper joint, an outer cylinder and a lower joint which are sequentially connected from top to bottom; the reversing assembly comprises a sealing seat, a valve core, a spring, a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring, a sixth sealing ring, a seventh sealing ring and an eighth sealing ring; the sealing seat is arranged in the upper connector, the lower end of the valve core is provided with a spring, the spring is arranged between the valve core and the outer cylinder, the spring is connected with the lower connector, and the cylinder at the lower end of the valve core is arranged in the annular groove of the lower connector; the upper section of the valve core is a hollow cylindrical section below the arc surface, and a through hole is formed in the side surface of the hollow cylindrical section to serve as a side hole; a through hole corresponding to the top of the upper section of the valve core is arranged in the middle of the sealing seat and serves as a main through hole; a through hole is arranged on the outer cylinder and is used as an outer through hole; a through hole is arranged on the side surface of the lower section of the valve core and is used as an inner through hole, and the diameter of the inner through hole is the same as that of the outer through hole; the valve core moves axially in the outer cylinder to realize the switching of the opening and closing of the flow passage from the upper joint to the inner cavity of the valve core and the flow passage from the outer through hole to the inner cavity of the valve core.
2. The reversing joint for continuous sand washing and well washing as recited in claim 1, wherein the upper joint is divided into an upper part and a lower part, the lower part of the inner side of the upper joint is provided with an annular step, the circumferential direction of the annular step is provided with at least eight axial through holes, and the lower part of the upper joint is provided with internal threads; the outer wall surface of the sealing seat is provided with an external thread, and the sealing seat is provided with a blind hole along the axial thread; the external thread of the sealing seat is connected with the internal thread at the upper part of the upper joint, and the axial relative position of the sealing seat and the upper joint thread is adjusted by rotating the sealing seat, so that the opening pressure of the valve core can be adjusted; after the rotary sealing seat reaches the designed position, the locking bolt penetrates through the through hole in the annular step of the upper joint to be connected with the thread on the sealing seat, so that the sealing seat is locked, and the sealing seat is prevented from rotating under the action of fluid impact and vibration.
3. The reversing joint for continuous sand washing and well washing as recited in claim 2, wherein the outer side of the lower portion of the upper joint is provided with an external thread and a smooth surface from top to bottom, and the external thread is used for connecting with the inner side of the outer cylinder, a second seal ring is provided on the contact surface of the smooth surface and the outer cylinder, the inner side of the lower portion of the upper joint is provided with four radial holes, the radial holes are perforated outwards from the inner side of the lower portion of the upper joint close to the upper end, and axial holes extending downwards to penetrate through the lower end surface of the lower portion of the upper joint are provided in the wall; the valve core comprises an upper section, a middle section and a lower section, the upper section of the valve core is used for forming line sealing with the sealing seat, the outer diameter of the middle section of the valve core is smaller than that of the lower section of the valve core, the outer wall of the middle section of the valve core is in clearance fit with the inner wall of the lower end of the upper joint, a first sealing ring is arranged between the outer wall of the middle section of the valve core and the inner wall of the lower end of the upper joint, and a second sealing ring is arranged between the outer wall of the lower end of the valve core and the outer barrel; when the sand washing pipe column is normally lowered, the sand washing liquid is injected from the upper joint and generates a vertical downward force acting on the step surface of the valve core through the main through hole of the sealing seat; meanwhile, the sand washing liquid flows into a hydraulic cylinder formed by the valve core and the outer cylinder through the radial holes and the axial holes which are formed in the upper joint in the circumferential direction, and meanwhile, the pressure of the sand washing liquid acts on the arc-shaped surface at the top of the valve core to generate a vertical downward force which is beneficial to opening the valve core and increasing the opening degree of the valve core.
4. The reversing joint for continuous sand washing and well washing as claimed in claim 1, wherein at least two rows of balls are arranged between the valve core and the outer cylinder, the balls are embedded in the wall surface of the valve core or the outer cylinder, at least three balls are arranged in the circumferential direction of each row of balls, the coaxiality of the valve core relative to the outer cylinder is favorably improved, and the valve core and the outer cylinder form a rolling pair, so that the friction resistance of the valve core along the axial movement is reduced, and the risk of clamping the valve core is reduced.
5. The reversing connector for continuous sand washing and well washing as claimed in claim 1, wherein two threaded blind holes are formed in the circumferential direction of the middle part of the valve core, two L-shaped grooves are formed in the side surface of the outer cylinder, and a pin passes through the L-shaped grooves in the outer cylinder and is in threaded connection with the threaded holes of the valve core; a fourth sealing ring and a fifth sealing ring are respectively arranged above and below the pin threaded hole on the valve core and the outer cylinder and used for sealing the L-shaped groove; when the valve core is stuck, acting force along the axial direction of the valve core can be applied to the pin through manual operation to drive the valve core to move in the L-shaped groove, so that the sticking is removed; the groove face on the upper side of the horizontal section of the L-shaped groove is provided with teeth, the cylindrical surface of the pin is provided with teeth meshed with the teeth on the upper groove face of the horizontal section of the L-shaped groove, and the teeth on the cylindrical surface of the pin are meshed with the teeth on the shaped groove to form self-locking, so that a channel at the valve core sealing seat is in a normally open state, and the local pressure loss and the valve core vibration of the sand washing liquid are reduced.
6. The reversing joint for continuous sand washing and well washing as claimed in claim 1, wherein a through hole is formed in the outer cylinder as an outer through hole, the through hole formed in the side surface of the lower section of the valve core has the same diameter as the outer through hole and is formed as an inner through hole, and a seventh sealing ring and a sixth sealing ring for sealing with the outer cylinder are respectively arranged below and above the inner through hole; the upper end of the lower joint is provided with a section of annular sunken groove, a bottom cylinder of the valve core is arranged in the annular sunken groove, the spring is arranged between the bottom cylinder of the valve core and the outer cylinder, the upper end of the spring is tightly abutted against the step surface at the lower end of the valve core, the lower end of the spring is tightly abutted against the step surface of the lower joint, and an eighth sealing ring is arranged between the bottom cylinder of the valve core and the wall surface of the annular sunken groove of the lower joint.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210016840.1A CN114320195B (en) | 2022-01-07 | 2022-01-07 | Reversing joint for continuous sand flushing and well flushing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210016840.1A CN114320195B (en) | 2022-01-07 | 2022-01-07 | Reversing joint for continuous sand flushing and well flushing |
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| CN114320195A true CN114320195A (en) | 2022-04-12 |
| CN114320195B CN114320195B (en) | 2023-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210016840.1A Active CN114320195B (en) | 2022-01-07 | 2022-01-07 | Reversing joint for continuous sand flushing and well flushing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575783A (en) * | 2022-05-06 | 2022-06-03 | 西安石油大学 | Intelligent well completion downhole hydraulic reversing device |
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| CN114575783B (en) * | 2022-05-06 | 2022-08-02 | 西安石油大学 | Intelligent well completion downhole hydraulic reversing device |
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| CN114320195B (en) | 2023-08-22 |
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