CN118757122B - High-load expansion packer - Google Patents
High-load expansion packer Download PDFInfo
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- CN118757122B CN118757122B CN202411205609.2A CN202411205609A CN118757122B CN 118757122 B CN118757122 B CN 118757122B CN 202411205609 A CN202411205609 A CN 202411205609A CN 118757122 B CN118757122 B CN 118757122B
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- cleaning
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- central tube
- support
- frame
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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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
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- Cleaning In General (AREA)
Abstract
本发明涉及石油开采领域，具体涉及一种高负荷扩张式封隔器。其包括中心管、胶筒、两组清理机构以及内支撑组件，中心管同轴设置于井眼套管的内部；胶筒同轴套设于中心管外侧且与中心管的外侧壁形成有充油腔；两组清理机构分别位于胶筒的上下两端且包括若干绕中心管圆周均布的清理筒；内支撑组件包括多个支撑部，每个支撑部均包括第一支撑辊和第二支撑辊。本发明通过清理机构和内支撑组件的配合，实现了对胶筒外壁和井眼套管内壁的清理，在胶筒扩张完成后对胶筒进行支撑，同时在胶筒扩张膨胀的过程中，通过清理筒、第一支撑辊和第二支撑辊沿周向对胶筒外壁以及胶筒内壁的碾压，使得胶筒均匀扩张，确保胶筒与井眼套管的可靠贴合，提高密封可靠性。
The present invention relates to the field of oil production, and specifically to a high-load expansion packer. It includes a center tube, a rubber tube, two groups of cleaning mechanisms and an internal support assembly. The center tube is coaxially arranged inside the wellbore casing; the rubber tube is coaxially sleeved on the outside of the center tube and forms an oil-filled cavity with the outer wall of the center tube; the two groups of cleaning mechanisms are respectively located at the upper and lower ends of the rubber tube and include a number of cleaning tubes evenly distributed around the circumference of the center tube; the internal support assembly includes a plurality of support parts, each of which includes a first support roller and a second support roller. The present invention realizes the cleaning of the outer wall of the rubber tube and the inner wall of the wellbore casing through the cooperation of the cleaning mechanism and the internal support assembly, supports the rubber tube after the expansion of the rubber tube is completed, and at the same time, during the expansion process of the rubber tube, the outer wall and the inner wall of the rubber tube are rolled circumferentially by the cleaning tube, the first support roller and the second support roller, so that the rubber tube expands evenly, ensuring the reliable fit between the rubber tube and the wellbore casing, and improving the sealing reliability.
Description
Technical Field
The invention relates to the field of petroleum exploitation, in particular to a high-load expansion packer.
Background
The packer is a downhole tool for sealing the annular space between the oil and gas well casing or the open hole wall, and when the annular space between the oil and gas well casing or the open hole wall is required to be sealed, the packer is connected to the downhole tubular column, and after the packer is lowered to the designed depth, the sealing element on the packer is inflated to seal the annular space of the oil and gas well casing in a hydraulic driving mode and the like. The packer can be divided into an expansion type, a compression type, a self-sealing type, a wedging type, a self-expansion type, a combined type and the like according to different expansion modes of the rubber cylinder, and the starting mode and the deblocking mode of the packer are different. After the hydraulic expansion packer is lowered to the designed depth, pressurizing from the oil pipe, enabling high-pressure liquid to act on the inner cavity of the rubber cylinder through the pressure transmission hole of the central pipe of the packer, and expanding the rubber cylinder under the action of throttling pressure difference so as to seal the annular space of the oil separation sleeve; when the oil pressure is released, after the oil jacket pressure is balanced, the rubber cylinder is retracted to the original state by the self resilience force, so that the deblocking is realized. The hydraulic expansion packer in the related art still has the following problems: firstly, the packer cannot be uniformly expanded under the hydraulic action, so that the sealing reliability is affected; secondly, particle impurities exist between the sleeve and the rubber cylinder, so that sealing is not tight easily, and abrasion to the rubber cylinder is increased; thirdly, as the depth of the oil-gas layer is deeper and deeper, the pressure difference formed by the upper part and the lower part of the expansion packer is also larger and larger, the capacity of the existing packer for bearing the pressure difference is limited, and the excessive deformation of a rubber cylinder can be possibly caused, or the rubber cylinder in sealing can generate peristaltic motion, so that the phenomenon of losing the seal of the packer is easy to occur.
In order to improve the above problems, chinese patent document with grant publication No. CN 116906004B discloses a packer for well cementation, in which impurities on a well wall are cleaned through a cleaning structure, a packing element is supported through a supporting mechanism to improve the bearing capacity of the packing element, and the expansion uniformity of the packing element is improved through an extrusion assembly and extrusion of the packing element, so that the sealing reliability of the packer is improved. But in above-mentioned scheme, the clearance subassembly utilizes a plurality of clearance sticks to clear up the wall of a well from last to down, and the comprehensiveness of clearance is relatively poor, and extrusion assembly's stripper plate encircles around the inner wall of packing element simultaneously, extrudes the packing element from last to down when the packing element expands, still very limited improvement to packing element expansion homogeneity.
The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
According to the defects of the prior art, the invention provides the high-load expansion packer, which can effectively clean the contact part of the well casing and the rubber cylinder, and can improve the uniformity of the expansion of the rubber cylinder, thereby improving the sealing reliability of the packer.
The invention relates to a high-load expansion packer which adopts the following technical scheme: comprising the following steps:
the central tube is coaxially arranged in the well casing;
The rubber cylinder is coaxially sleeved on the outer side of the central tube and is formed with an oil filling cavity with the outer side wall of the central tube, and the oil filling cavity is communicated with the inner part of the central tube; the rubber cylinder has elasticity and can expand;
The two groups of cleaning mechanisms are respectively positioned at the upper end and the lower end of the rubber cylinder, each cleaning mechanism comprises a plurality of cleaning cylinders uniformly distributed around the circumference of the central tube, each cleaning cylinder vertically extends, each cleaning cylinder can rotate around the axis of the central tube and rotate around the axis of the corresponding cleaning cylinder, each cleaning cylinder can elastically slide along the radial direction of the central tube and can move up and down, the initial cleaning cylinder has a trend of approaching the axis of the central tube, and the cleaning cylinders of the two groups of cleaning mechanisms are axially positioned at limit positions mutually approaching to each other so as to enable the cleaning cylinders to collide with the side wall of the rubber cylinder;
The inner support assembly is positioned in the oil filling cavity and comprises a plurality of support parts, the support parts are uniformly distributed along the circumferential direction of the central tube, each support part comprises a first support roller and a second support roller, the first support rollers and the second support rollers vertically extend, the first support rollers are two, the first support rollers are respectively positioned at the upper side and the lower side of the second support rollers and are coaxial, the first support rollers and the second support rollers can elastically slide along the radial direction of the central tube, the first support rollers and the second support rollers can rotate around the axis of the support rollers, and the first support rollers and the second support rollers can reversely rotate for a set angle along the inner wall of the rubber cylinder synchronously;
After the oil filling cavity is subjected to injection operation, the rubber cylinder is expanded to drive the cleaning cylinder to synchronously approach the inner wall of the well casing, and meanwhile, the cleaning cylinder rotates around the axis of the central pipe to clean the outer wall of the rubber cylinder and roll the outer wall of the rubber cylinder; when the rubber cylinder is expanded to the contact of the cleaning cylinder and the inner wall of the borehole casing, the cleaning cylinder rotates and moves in the axial direction of the cleaning cylinder in the direction away from the rubber cylinder, the cleaning cylinder rotates and moves simultaneously to clean the inner wall of the borehole casing, meanwhile, the first support roller and the second support roller approach the inner wall of the rubber cylinder, and after the first support roller and the second support roller contact the inner peripheral wall of the rubber cylinder, the first support roller and the second support roller synchronously and reversely rotate along the inner wall of the rubber cylinder to roll the rubber cylinder; after the cleaning cylinder moves to be separated from the stop with the side wall of the rubber cylinder along the axial direction, the rubber cylinder expands to be abutted with the inner wall of the well casing, and the inner wall of the rubber cylinder is supported by the first support roller and the second support roller at intervals.
Optionally, the periphery cover of center tube is equipped with the drain section of thick bamboo, is formed with annular oil pocket between drain section of thick bamboo and the center tube, is provided with a plurality of oilholes on the center tube, and oilhole intercommunication annular oil pocket is crossed to the oilhole, is provided with a plurality of stay tubes of following its circumference equipartition on the drain section of thick bamboo, and the stay tube is cavity and intercommunication annular oil pocket and oil filling chamber.
Optionally, the cleaning mechanism further comprises a rotating frame and a telescopic frame, the rotating frame is coaxially sleeved on the outer side of the central tube, the rotating frames of the two groups of cleaning mechanisms are respectively positioned on the upper side and the lower side of the rubber cylinder, and the rotating frame can rotate around the axis of the rotating frame; the telescopic frames are arranged on the rotating frame and uniformly distributed along the circumferential direction of the rotating frame, the telescopic frames are inserted in the rotating frame in a sliding way along the radial direction, first elastic pieces are arranged between the telescopic frames and the rotating frame, and the telescopic frames are close to the rotating frame due to the initial first elastic pieces; the outer end of expansion bracket is provided with the lead screw, and the lead screw is vertical to be set up, and the lead screw is directional to the packing element in the upper and lower direction, and corresponding lead screw is located with the expansion bracket one-to-one and cover to the clearance section of thick bamboo, clearance section of thick bamboo and lead screw spiro union.
Optionally, the high-load expansion packer further comprises a power mechanism, the power mechanism comprises an impeller, the impeller is rotatably arranged on the supporting tube, the impeller is connected with a transmission shaft, first gears are arranged at two ends of the transmission shaft, first toothed rings are arranged on the rotating frame and meshed with the corresponding transmission toothed rings, and then the rotating frame is driven to rotate.
Optionally, a screw hole is formed in the center of the cleaning cylinder, the screw rod is inserted into the screw hole and is in threaded fit with the screw hole, an annular cavity is formed in the cleaning cylinder and located at the periphery of the screw hole, a movable magnet is slidably arranged in the annular cavity, the annular cavity is divided into a first cavity and a second cavity by the movable magnet, the first cavity is located at the tail end of the cleaning cylinder, an exhaust hole is formed in the side wall of the tail end of the cleaning cylinder, and the exhaust hole is communicated with the first cavity; the tail end of the screw rod is provided with a fixed magnet which is attracted with the movable magnet.
Optionally, two fixing frames which are vertically spaced are coaxially sleeved on the outer side of the middle part of the central tube, the corresponding fixing frames are positioned between the rubber cylinder and the rotating frame, the upper end and the lower end of the rubber cylinder are respectively connected with the two fixing frames, a fixed shaft is arranged on the telescopic frame, the fixed shaft is parallel to the lead screw and positioned between the lead screw and the rotating frame, a second gear is rotatably arranged on the fixed shaft, teeth are arranged on the peripheral wall of the cleaning cylinder, and the gears are meshed with the cleaning cylinder; the fixing frame is provided with a second toothed ring, and the second gear is positioned outside the second toothed ring and can be meshed with the second toothed ring.
Optionally, the supporting part further comprises a connecting frame and a telescopic block, the telescopic block is sleeved at the outer end of the supporting tube in a sliding manner along the radial direction of the central tube and is connected with a second elastic piece between the telescopic block and the supporting tube, the second elastic piece enables the telescopic block to have a trend of approaching the supporting tube, a flow hole is formed in the supporting tube, the flow hole is located between the impeller and the telescopic block, and the flow hole is communicated with the oil filling cavity;
the upper end face and the lower end face of the supporting tube are both provided with guide sliding grooves, each guide sliding groove comprises a straight groove and a chute, the straight grooves are connected with each other, extend along the radial direction of the central tube and are close to the axis of the central tube, and the chute is connected to one end of the straight groove far away from the axis of the central tube and inclines to one side;
The upper end face and the lower end face of the telescopic block are respectively provided with a hinge hole and an arc waist hole, the radial hinge holes along the central tube are positioned at the inner sides of the arc waist holes, one end of each arc waist hole is aligned with each hinge hole, and the other end of each arc waist hole is deviated to one side of each hinge hole and is positioned at the same side with the chute of the guide chute;
The two connecting frames are respectively arranged on the upper side and the lower side of the telescopic block, a first lug and a second lug are arranged on one side, close to the telescopic block, of the connecting frame, the first lug and the second lug are arranged at intervals along the radial direction of the central tube and are positioned on the inner side, the first lug is inserted into the hinge hole, the second lug is inserted into the arc waist hole, and the first lug and the second lug are both arranged in the guide chute in a sliding mode;
the outer end of the connecting frame is provided with a first installation shaft which extends vertically, the first installation shaft can elastically slide along the radial direction of the central tube, and the first support roller is rotatably arranged on the first installation shaft; the outer end of the telescopic block is hinged with a vertically extending rotating shaft, one side of the rotating shaft, which is away from the telescopic block, is connected with a second installation shaft through an elastic telescopic rod, and a second support roller is rotatably arranged on the second installation shaft;
a transmission structure is arranged between the connecting frame and the rotating shaft, and the transmission structure is configured to convert the rotation of the connecting frame into synchronous reverse rotation of the rotating shaft.
Optionally, the transmission structure includes arc rack, and arc rack sets up in the link and is close to one side of telescopic block, and the upper and lower both ends periphery wall of pivot is provided with the tooth, arc rack and pivot external engagement.
Optionally, a sliding rod extending horizontally is arranged on the first installation shaft, and the sliding rod is inserted into the connecting frame in a sliding manner and is connected with a third elastic piece between the connecting frame and the connecting frame.
Optionally, an upper joint and a lower joint are coaxially arranged at the upper end and the lower end of the central tube respectively.
The beneficial effects of the invention are as follows: according to the high-load expansion packer, the cleaning mechanism and the inner supporting component are arranged and matched, so that the outer wall of the rubber cylinder and the inner wall of the well casing are cleaned, the rubber cylinder is supported after the expansion of the rubber cylinder is completed, and meanwhile, the outer wall of the rubber cylinder and the inner wall of the rubber cylinder are rolled in the circumferential direction through the cleaning cylinder, the first supporting roller and the second supporting roller in the expansion process of the rubber cylinder, so that the rubber cylinder is uniformly expanded, the reliable fit between the rubber cylinder and the inner wall of the well casing is ensured, and the sealing reliability is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of the installation location of a high load expanding packer of the present invention within a wellbore casing;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2 (with the packing element unexpanded);
FIG. 4 is a schematic view of the overall structure of a high load expanding packer of the present invention;
FIG. 5 is an exploded view of a high load expanding packer of the present invention;
FIG. 6 is an exploded view of the cleaning mechanism and its mating components of the present invention;
FIG. 7 is a schematic view of a support portion and its mating components of the inner support assembly of the present invention;
FIG. 8 is an exploded view of FIG. 7;
FIG. 9 is a schematic view of the present invention in a state where the cleaning barrel is in contact with the inner wall of the wellbore casing;
FIG. 10 is an elevation view of the present invention (with the cleaning cartridge disengaged from the inner wall of the wellbore casing);
FIG. 11 is a cross-sectional view B-B of FIG. 10;
FIG. 12 is a schematic view of a cleaning cartridge according to the present invention.
In the figure:
100. a wellbore casing;
200. An upper joint;
300. A lower joint;
400. A central tube; 410. a fixing frame; 450. a liquid guide cylinder; 460. a support tube; 461. a guide chute; 462. a flow hole;
500. a rubber cylinder;
600. a cleaning mechanism; 610. a rotating frame; 630. a telescopic frame; 631. a screw rod; 632. a fixed shaft; 633. a fixed magnet; 640. a second gear; 650. a cleaning cylinder; 651. an exhaust hole; 652. a threaded hole; 653. an annular chamber; 660. a movable magnet;
700. An inner support assembly; 730. a connecting frame; 731. a first bump; 732. a second bump; 733. an arc-shaped rack; 740. a first backup roll; 750. a telescopic block; 751. a hinge hole; 752. an arc waist hole; 760. a rotating shaft; 770. a second support roller; 780. a first mounting shaft; 790. a second mounting shaft;
810. a transmission shaft; 820. an impeller; 830. a first gear.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 12, a high load expansion packer provided by an embodiment of the present invention includes a base pipe 400, a packing element 500, a cleaning mechanism 600, and an inner support assembly 700. The center tube 400 is coaxially disposed within the wellbore casing 100; the rubber cylinder 500 is coaxially sleeved outside the central tube 400, and an oil filling cavity is formed with the outer side wall of the central tube 400 and is communicated with the inside of the central tube 400; the rubber cylinder 500 has elasticity and can expand, in an initial state, the outer side wall of the rubber cylinder 500 and the inner side wall of the well casing 100 have a gap, and in order to facilitate the installation of the rubber cylinder 500, the middle outer side of the central tube 400 is coaxially sleeved with two fixing frames 410 (lower near the bottom of the well and upper on the contrary); the upper and lower ends of the rubber cylinder 500 are respectively connected with two fixing frames 410, and the oil filling cavity is formed among the rubber cylinder 500, the fixing frames 410 and the central tube 400.
The cleaning and cleaning mechanisms 600 are two groups, and are respectively located at the upper end and the lower end of the rubber tube 500, each group of cleaning mechanism 600 comprises a plurality of cleaning cylinders 650 uniformly distributed around the circumference of the central tube 400, each cleaning cylinder 650 extends vertically, each cleaning cylinder 650 can rotate around the axis of the central tube 400 and can rotate around the axis of the corresponding cleaning cylinder 650, meanwhile, each cleaning cylinder 650 can elastically slide along the radial direction of the central tube 400 and can move up and down, the initial cleaning cylinder 650 has a trend of approaching the axis of the central tube 400, and the cleaning cylinders 650 of the two groups of cleaning mechanisms are located at limiting positions which are mutually approaching in the axial direction so that the cleaning cylinders 650 are in contact with the side wall of the rubber tube 500, as shown in fig. 3.
The inner support assembly 700 is located the inside oil charging chamber of packing element 500, the inner support assembly 700 includes a plurality of supporting parts, a plurality of supporting parts are along the circumferencial direction equipartition of center tube 400, every supporting part is all including first backing roll 740 and second backing roll 770, first backing roll 740 and second backing roll 770 vertically extend, first backing roll 740 has two, first backing roll 740 is located the upper and lower both sides and the coaxial of second backing roll 770 respectively, first backing roll 740 and second backing roll 770 all can follow the radial elasticity slip of center tube 400, simultaneously first backing roll 740 and second backing roll 770 all can rotate around self axis, and first backing roll 740 and second backing roll 770 can follow the synchronous reverse rotation of inner wall of packing element 500 and set for the angle.
After the injection operation is performed on the oil filling cavity, the rubber cylinder 500 expands to drive the cleaning cylinder 650 to synchronously approach the inner wall of the well casing 100, and meanwhile, the cleaning cylinder 650 rotates around the axis of the central pipe 400 to clean the outer wall of the rubber cylinder 500 and roll the outer wall of the rubber cylinder 500, so that the rubber cylinder 500 is uniformly expanded; when the rubber tube 500 is expanded until the cleaning tube 650 contacts with the inner wall of the wellbore casing 100, the cleaning tube 650 rotates and moves in the axial direction thereof in a direction away from the rubber tube 500, the cleaning tube 650 rotates and moves to clean the inner wall of the wellbore casing 100, meanwhile, the first support roller 740 and the second support roller 770 approach to the inner wall of the rubber tube 500, and after the first support roller 740 and the second support roller 770 contact with the inner peripheral wall of the rubber tube 500, the first support roller 740 and the second support roller 770 synchronously rotate reversely along the inner wall of the rubber tube 500 to roll the rubber tube 500, so that the rubber tube 500 is uniformly expanded; after the cleaning cylinder 650 moves axially to be separated from the side wall of the rubber cylinder 500, the rubber cylinder 500 expands to be in contact with the inner wall of the wellbore casing 100, and the first support roller 740 and the second support roller 770 support the inner wall of the rubber cylinder 500 at intervals, so that the bearing capacity of the rubber cylinder 500 is improved, and the sealing reliability is further improved.
It should be further added that the upper and lower ends of the central tube 400 are coaxially provided with an upper connector 200 and a lower connector 300 respectively for connecting oil pipes or other accessories, when in use, each section of oil pipe is inspected and connected with the packer of the invention, the packer is lowered to a set position in a well, the central tube 400 is injected and pressed through the oil pipe, hydraulic oil enters an oil filling cavity through the central tube 400, the rubber cylinder 500 is expanded to realize seat sealing, and when in unsealing, the hydraulic oil flows reversely, the rubber cylinder 500 is retracted under the action of self elasticity to realize unsealing. According to the invention, through the cooperation of the cleaning mechanism 600 and the inner support assembly 700, the cleaning of the rubber cylinder 500 and the inner wall of the borehole casing 100 is realized, the rubber cylinder 500 is supported after the expansion of the rubber cylinder 500 is completed, and meanwhile, in the process of expanding the rubber cylinder 500, the rubber cylinder 500 is uniformly expanded through the rolling of the outer wall and the inner wall of the rubber cylinder 500 along the circumferential direction by the cleaning cylinder 650, the first support roller 740 and the second support roller 770, so that the reliable fitting of the rubber cylinder 500 and the inner wall of the borehole casing 100 is ensured, and the sealing reliability is improved.
In a further embodiment, the cleaning mechanism 600 further includes a rotating frame 610 and a telescopic frame 630, the rotating frame 610 is coaxially sleeved outside the central tube 400, the rotating frames 610 of the two sets of cleaning mechanisms 600 are respectively located at the upper side and the lower side of the rubber cylinder 500, and the rotating frames 610 can rotate around the axis of the rotating frames; the telescopic frames 630 are arranged on the rotating frame 610 and are uniformly distributed along the circumferential direction of the rotating frame 610, the telescopic frames 630 are inserted into the rotating frame 610 in a sliding way along the radial direction, first elastic pieces are arranged between the telescopic frames 630 and the rotating frame 610, and the telescopic frames 630 are close to the rotating frame 610 due to the initial first elastic pieces; the outer end of expansion bracket 630 is provided with lead screw 631 (the axis that is close to center tube 400 along the radial direction of center tube 400 is interior, the axis that is kept away from center tube 400 is outside), and lead screw 631 vertically sets up, and lead screw 631 points to glue barrel 500 in the upper and lower direction, and cleaning barrel 650 and expansion bracket 630 one-to-one and the cover are located corresponding lead screw 631, and cleaning barrel 650 and lead screw 631 spiro union. The initial cleaning cylinder 650 is positioned at the bottom end of the screw 631, the cleaning cylinder 650 rotates along the peripheral wall of the rubber cylinder 500, and the cleaning cylinder 650 does not move along the axial direction; after the cleaning cylinder 650 contacts with the inner wall of the wellbore casing 100, the cleaning cylinder 650 rolls along the inner wall edge of the wellbore casing 100 and rises under the friction action of the inner wall of the wellbore casing 100, gradually breaks away from the stop with the side wall of the rubber cylinder 500, and the telescopic frame 630 is retracted inwards under the elastic action, so that the rubber cylinder 500 is conveniently expanded.
A high load expanding packer of the present invention further comprises a power mechanism configured to drive the turret 610 to rotate under the impact of hydraulic pressure.
In a further embodiment, the outer circumference of the central tube 400 is sleeved with a liquid guiding tube 450, an annular oil cavity is formed between the liquid guiding tube 450 and the central tube 400, a plurality of oil passing holes are formed in the central tube 400 and communicated with the annular oil cavity, a plurality of horizontally extending supporting tubes 460 uniformly distributed along the circumference of the liquid guiding tube 450 are arranged on the liquid guiding tube 450, and the supporting tubes 460 are hollow and communicated with the annular oil cavity and the oil filling cavity.
The power mechanism comprises an impeller 820, the impeller 820 is rotatably arranged on the supporting tube 460, a transmission shaft 810 is connected to the impeller 820, first gears 830 are arranged at two ends of the transmission shaft 810, first toothed rings are arranged on the rotating frame 610, and the first gears 830 are meshed with the corresponding transmission toothed rings so as to drive the rotating frame 610 to rotate. To facilitate installation, a drive shaft 810 passes through the mount 410.
In a further embodiment, a threaded hole 652 is formed in the center of the cleaning barrel 650, a lead screw 631 is inserted into the threaded hole 652 and is in threaded fit with the threaded hole 652, an annular cavity 653 is formed in the cleaning barrel 650 and located at the periphery of the threaded hole 652, a movable magnet 660 is slidably arranged in the annular cavity 653, the movable magnet 660 divides the annular cavity 653 into a first cavity and a second cavity, the first cavity is located at the tail end of the cleaning barrel 650, an exhaust hole 651 is formed in the side wall of the tail end of the cleaning barrel 650, and the exhaust hole 651 is communicated with the first cavity; the end of the screw 631 is provided with a fixed magnet 633, and the fixed magnet 633 is attracted to the movable magnet 660. When the cleaning cylinder 650 moves along the axial direction away from the rubber cylinder 500 while rotating, the movable magnet 660 and the cleaning cylinder 650 slide relatively, the volume of a first chamber inside the cleaning cylinder 650 is reduced, and the gas in the first chamber is discharged from the exhaust hole 651 and blown between the rubber cylinder 500 and the borehole casing 100 to blow off sundries, so that the cleaning effect is further improved.
In a further embodiment, the telescopic frame 630 is provided with a fixed shaft 632, the fixed shaft 632 is parallel to the screw rod 631 and is positioned between the screw rod 631 and the rotating frame 610, the fixed shaft 632 is rotatably provided with a second gear 640, the peripheral wall of the cleaning barrel 650 is provided with teeth, and the gears are meshed with the cleaning barrel 650; the mount 410 is provided with a second toothed ring, and the second gear 640 is located outside and capable of meshing with the second toothed ring. When the invention needs to be taken out of the well, the hydraulic oil flows reversely to release pressure, the rubber cylinder 500 contracts, meanwhile, the rotating frame 610 rotates reversely, at the moment, because the telescopic frame 630 is in a retracted state, the second gear 640 is meshed with the second toothed ring, and the second gear 640 rolls along the second toothed ring and rotates in the rotating process of the rotating frame 610, so that the cleaning cylinder 650 is driven to move along the axial direction towards the direction approaching to the rubber cylinder 500, and the cleaning cylinder 650 is reset to the state shown in fig. 3.
In a further embodiment, the supporting portion further includes a connecting frame 730 and a telescopic block 750, the telescopic block 750 is slidably sleeved on the outer end of the supporting tube 460 along the radial direction of the central tube 400 and is connected with a second elastic member between the telescopic block 750 and the supporting tube 460, the second elastic member makes the telescopic block 750 have a trend of approaching the supporting tube 460, the supporting tube 460 is provided with a flow hole 462, the flow hole 462 is located between the impeller 820 and the telescopic block 750, the flow hole 462 is communicated with an oil filling cavity, and hydraulic oil is injected into the oil filling cavity through the flow hole 462 so that the rubber cylinder 500 expands.
The upper and lower both end surfaces of the support pipe 460 are provided with guide sliding grooves 461, the guide sliding grooves 461 include straight grooves and inclined grooves connected, the straight grooves extend along the radial direction of the central pipe 400 and are close to the axis of the central pipe 400, and the inclined grooves are connected at one end of the straight grooves far away from the axis of the central pipe 400 and incline to one side, and it can be understood that in order to ensure that hydraulic oil does not flow out of the guide sliding grooves 461, the guide sliding grooves 461 are not penetrated up and down.
The upper and lower end surfaces of the telescopic block 750 are provided with hinge holes 751 and arc waist holes 752, the radial hinge holes 751 along the center tube 400 are located at the inner sides of the arc waist holes 752, one end of the arc waist holes 752 is aligned with the hinge holes 751, and the other end is biased to one side of the hinge holes 751 and located at the same side as the chute of the guide chute 461.
The two connecting frames 730 are arranged on the upper side and the lower side of the telescopic block 750 respectively, a first lug 731 and a second lug 732 are arranged on one side, close to the telescopic block 750, of the connecting frame 730, the first lug 731 and the second lug 732 are arranged at intervals along the radial direction of the central tube 400, the first lug 731 is located on the inner side, the first lug 731 is inserted into the hinging hole 751, the second lug 732 is inserted into the arc waist hole 752, and the first lug 731 and the second lug 732 are both arranged on the guide chute 461 in a sliding mode.
The outer end of the connection frame 730 is provided with a first installation shaft 780 extending vertically, the first installation shaft 780 can elastically slide along the radial direction of the central tube 400, specifically speaking, the first installation shaft 780 is provided with a sliding rod extending horizontally, the sliding rod is inserted in the connection frame 730 in a sliding manner and is connected with a third elastic piece between the connection frame 730, and the first supporting roller 740 is rotatably arranged on the first installation shaft 780.
The outer end of the telescopic block 750 is hinged with a vertically extending rotating shaft 760, one side of the rotating shaft 760 away from the telescopic block 750 is connected with a second installation shaft 790 through an elastic telescopic rod, and a second supporting roller 770 is rotatably arranged on the second installation shaft 790; for easy installation, the second support roller 770 includes a first roller body and a second roller body, which are rotatably installed on the second installation shaft 790 and are respectively located at the upper and lower sides of the elastic telescopic rod.
A transmission structure is provided between the connection frame 730 and the rotation shaft 760, and is configured to convert rotation of the connection frame 730 into synchronous counter-rotation of the rotation shaft 760.
Further, the transmission structure includes an arc-shaped rack 733, the arc-shaped rack 733 is disposed on one side of the connecting frame 730, which is close to the telescopic block 750, and the peripheral walls of the upper and lower ends of the rotating shaft 760 are provided with teeth, and the arc-shaped rack 733 is externally meshed with the rotating shaft 760.
In combination with the above embodiment, the application principle and working process of the invention are as follows:
Initially, as shown in fig. 3, the rubber 500 is in a normal state, the cleaning cylinder 650 is located at the bottom of the screw 631, and the cleaning cylinder 650 is in contact with the outer circumferential wall of the rubber 500. When the packer of the present invention is lowered to a preset position in a well, hydraulic pressure flows into the guide cylinder 450 through the central pipe 400 and into the packing 500 through the flow holes 462 on the support pipe 460 by means of tubing injection, the packing 500 is gradually expanded and the cleaning cylinder 650 is driven to move radially outwardly against the elastic force of the first elastic member between the expansion bracket 630 and the turret 610 until the cleaning cylinder 650 contacts the inner wall of the wellbore casing 100, as shown in fig. 9. In this process, hydraulic oil drives the impeller 820 to rotate through the impeller 820, the impeller 820 drives the transmission shaft 810 to rotate, the transmission shaft 810 drives the rotating frame 610 to rotate through the first output wheel and the first toothed ring, and the cleaning cylinder 650 revolves to roll the outer side wall of the rubber cylinder 500.
When the cleaning cylinder 650 contacts with the inner wall of the wellbore casing 100, the hydraulic pressure is difficult to continue to flow into the rubber cylinder 500, the hydraulic pressure overcomes the elasticity of the second elastic member between the telescopic block 750 and the supporting tube 460, so that the telescopic block 750 stretches out, the first supporting roller 740 and the second supporting roller 770 contact with the inner wall of the rubber cylinder 500, and compress the third elastic member between the slide bar and the connecting frame 730 and the elastic member inside the elastic telescopic rod until the second bump 732 moves to the chute portion of the guide chute 461, the connecting frame 730 starts to rotate around the first bump 731, the second bump 732 slides in the arc waist hole 752, and under the meshing action of the arc rack 733 and the rotating shaft 760, the rotating shaft 760 reversely rotates relative to the connecting frame 730, the inner wall of the rubber cylinder 500 is crushed by the first supporting roller 740 and the second supporting roller 770, the internal stress in the expansion process of the rubber cylinder 500 is eliminated, the inner wall of the rubber cylinder 500 is more uniformly expanded, and after the rotating shaft 760 and the connecting frame 730 rotate in place, the first supporting roller 740 and the second supporting roller 770 support the inner wall of the rubber cylinder 500 at intervals, as shown in fig. 11. At this time, in the revolution process of the cleaning cylinder 650, the cleaning cylinder 650 is tightly attached to the inner wall of the borehole casing 100 under the action of the rubber cylinder 500, the cleaning cylinder 650 rotates and moves along the lead screw 631 in a direction away from the rubber cylinder 500, the inner wall of the borehole casing 100 is cleaned and gradually separated from the rubber cylinder 500, in the process that the cleaning cylinder 650 is away from the rubber cylinder 500, the movable magnet 660 moves in a direction close to the rubber cylinder 500 relative to the cleaning cylinder 650, air in the first chamber is extruded, and the air is ejected out through the air vent 651, so that further cleaning of impurities is realized. After the cleaning cartridge 650 is disengaged from the glue cartridge 500, the telescoping 630 begins to reset (the telescoping 630 returns to the state of FIG. 3, but now the cleaning cartridge 650 is at the top of the lead screw 631 and the cleaning cartridge 650 is at the end of the lead screw 631 in FIG. 3).
When the retraction device is needed, the hydraulic oil flows reversely, the transmission shaft 810 is reversed, so that the rotating frame 610 is reversed, and then the second gear 640 rotates while revolving along with the rotating frame 610 through the engagement of the second toothed ring on the fixing frame 410 and the second gear 640, so that the cleaning cylinder 650 is driven to rotate, and the cleaning cylinder 650 moves towards the tail end of the screw rod 631 on the basis of the resetting, and finally the initial state shown in fig. 3 is realized.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
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| CN202411205609.2A CN118757122B (en) | 2024-08-30 | 2024-08-30 | High-load expansion packer |
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| CN202411205609.2A CN118757122B (en) | 2024-08-30 | 2024-08-30 | High-load expansion packer |
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| CN118757122B true CN118757122B (en) | 2024-11-15 |
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| CN118926698B (en) * | 2024-10-14 | 2025-03-07 | 洛阳航辉新材料有限公司 | A laser welding device for large thin-walled cylinders |
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| CN115142810A (en) * | 2022-09-01 | 2022-10-04 | 东营市靖驰石油科技有限责任公司 | Spiral expanding type casing pipe external packer |
| CN116906004A (en) * | 2023-09-08 | 2023-10-20 | 山东巨辉石油科技有限公司 | Packer for well cementation |
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| DE2325636A1 (en) * | 1972-05-26 | 1973-12-06 | Schlumberger Technology Corp | HOLE PACKER |
| RU2201496C2 (en) * | 2001-05-21 | 2003-03-27 | Открытое акционерное общество "Татнефть" | Device to clean out formations in well |
| CA2444648A1 (en) * | 2002-12-06 | 2004-06-06 | Tesco Corporation | Anchoring device for a wellbore tool |
| US8276677B2 (en) * | 2008-11-26 | 2012-10-02 | Baker Hughes Incorporated | Coiled tubing bottom hole assembly with packer and anchor assembly |
| US10024150B2 (en) * | 2013-11-14 | 2018-07-17 | Kobold Corporation | Bottom hole assembly for wellbore completion |
| GB201412665D0 (en) * | 2014-07-16 | 2014-08-27 | Omega Completion Technology | Elastically deformable support for an expandable seal element of a downhole tool |
| GB201522652D0 (en) * | 2015-12-22 | 2016-02-03 | Coretrax Technology Ltd | A method of setting a hydro-mechanical squeeze packer |
| CN117703303B (en) * | 2024-02-06 | 2024-04-05 | 东营市华科石油科技开发有限责任公司 | Screw expansion type casing external packer |
| CN117738613B (en) * | 2024-02-20 | 2024-04-30 | 东营市华科石油科技开发有限责任公司 | Long-acting double-rubber-cylinder double-deblocking expanding packer |
| CN118065808B (en) * | 2024-04-22 | 2024-08-13 | 天津康坦石油设备科技有限公司 | High-temperature-resistant packer for petroleum exploitation |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142810A (en) * | 2022-09-01 | 2022-10-04 | 东营市靖驰石油科技有限责任公司 | Spiral expanding type casing pipe external packer |
| CN116906004A (en) * | 2023-09-08 | 2023-10-20 | 山东巨辉石油科技有限公司 | Packer for well cementation |
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