CN109138857B - Hydraulic micro-rotation safety joint for downhole tubular column - Google Patents
Hydraulic micro-rotation safety joint for downhole tubular column Download PDFInfo
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- CN109138857B CN109138857B CN201811207389.1A CN201811207389A CN109138857B CN 109138857 B CN109138857 B CN 109138857B CN 201811207389 A CN201811207389 A CN 201811207389A CN 109138857 B CN109138857 B CN 109138857B
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- joint
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 50
- 239000011148 porous material Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/06—Releasing-joints, e.g. safety joints
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a hydraulic micro-rotation safety joint for a downhole tubular column, which comprises an upper joint and a lower joint, wherein central holes of the two joints are coaxial and mutually communicated, the upper end of the lower joint is provided with a cylinder body extending upwards, a sliding sleeve capable of axially sliding along the inner wall of the cylinder body is arranged in an inner cavity of the cylinder body, the central hole of the sliding sleeve is gradually reduced from top to bottom, the lower end of the sliding sleeve is provided with a bell-mouth-shaped ball seat, the ball seat is matched with a steel ball which can be closed, and a throat opening at the lower end of the ball seat is communicated with the central hole of the lower joint; the outer wall of the lower end of the sliding sleeve is fixed on the cylinder body through a shear pin, the lower part of the upper joint is inserted into the cylinder body and is embedded with the inner wall of the cylinder body after rotating, and the lower end of the upper joint is inserted into the upper end of the sliding sleeve through a spline. An upper joint outer step is arranged at the middle section of the upper joint, the upper joint outer step is pressed on the upper port of the cylinder body, and the diameter of the part below the upper joint outer step is reduced section by section; the inner cavity of the cylinder body is gradually reduced from top to bottom. The safety joint is convenient to operate, is not influenced by friction resistance and well deviation of the pipe column, and has high disconnection success rate.
Description
Technical Field
The invention relates to a safety joint, in particular to a hydraulic micro-rotation safety joint for a downhole tubular column, and belongs to the technical field of screw drilling tools.
Background
Safety joints are an auxiliary tool applied to downhole operations and production strings. When a stuck pipe column occurs, the stuck pipe column can be disconnected from the safety joint, so that a good condition is created for further processing of the accident. At present, the common safety joint for oil fields mainly comprises two types of zigzag type and square buckle type, wherein the two types of safety joints comprise an upper joint, a lower joint and a sealing ring. The upper end of the upper joint is provided with an internal thread connected with the pipe column, and the lower half part is provided with a wide sawtooth external thread. The outer cylindrical surface between the two parts is provided with a splayed convex-concave structure. The lower end of the lower joint is provided with an external thread connected with a pipe column, the inside of the lower joint is provided with a wide sawtooth internal thread, and the upper end surface of the lower joint is provided with a splayed convex-concave structure matched with the upper joint.
The upper and lower connectors of the two safety connectors are connected through threads and are used for transmitting positive and negative torque; whereas the "splayed" relief on it is a locking device that generates a pretension and remains constant. When the safety joint is lost, a certain impact force and reactive torque are firstly applied to the safety joint to enable the safety joint to be disconnected. Because of the threaded connection, the applied torque is opposite to the thread direction of the pipe column, and is influenced by friction resistance and well deviation of the pipe column and the casing wall, torque and weight transmission of the pipe column are very difficult, and the phenomenon of undeployment often occurs.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides a hydraulic micro-rotation safety joint for a downhole tubular column, which is convenient to operate, free from the influence of friction resistance and well deviation of the tubular column and a casing wall and high in disconnection success rate.
In order to solve the technical problems, the hydraulic micro-rotation safety joint for the underground pipe column comprises an upper joint and a lower joint, wherein central holes of the upper joint and the lower joint are coaxial and mutually communicated, a cylinder body extending upwards is arranged at the upper end of the lower joint, a sliding sleeve capable of axially sliding along the inner wall of the cylinder body is arranged in an inner cavity of the cylinder body, the central hole of the sliding sleeve is gradually reduced from top to bottom, a bell mouth-shaped ball seat is arranged at the lower end of the sliding sleeve, the ball seat is matched with a steel throwing ball capable of closing the ball seat, and a throat opening at the lower end of the ball seat is communicated with the central hole of the lower joint; the lower end outer wall of the sliding sleeve is fixed on the cylinder body through a shear pin, the lower part of the upper joint is inserted into the cylinder body and is embedded with the inner wall of the cylinder body after rotating, and the lower end of the upper joint is inserted into the upper end of the sliding sleeve through a spline.
Compared with the prior art, the invention has the following beneficial effects: when the upper joint is assembled, the sliding sleeve is firstly put into the cylinder, then the lower end of the upper joint is inserted into the inner cavity of the cylinder, and then the upper joint is rotated to enable the lower part of the upper joint to be embedded with the inner wall of the cylinder, so that the upper joint and the cylinder can bear axial tension and can transmit torque; the sliding sleeve is then jacked up to connect the upper end of the sliding sleeve with the lower end of the upper joint through the spline, and then the sliding sleeve is fixed on the cylinder through the shear pins, so that the sliding sleeve limits the rotation of the upper joint and provides torque. When the safety joint is required to be lost, the steel throwing ball is thrown into the pipe column, the steel throwing ball falls on the ball seat to be seated, the central pore canal is closed to generate pressure holding, when the pressure holding reaches 10MPa, the shear pin is sheared, the sliding sleeve slides downwards to separate from the upper joint, the upper joint is reversely rotated to separate from the inner wall of the cylinder body, and then the upper joint can be pulled out upwards to realize releasing. Because the upper joint and the cylinder body are not in threaded connection, but are mutually embedded, the mutual binding force is very small, the friction resistance and well deviation influence of the pipe column and the casing wall are avoided during releasing, the upper joint can be tripped by only throwing steel balls and slightly rotating the upper joint, the tripping success rate is high, the operation is convenient, and the performance is reliable.
As an improvement of the invention, the middle section of the upper joint is provided with an upper joint outer step which is pressed on the upper port of the cylinder body, and the diameter of the part below the upper joint outer step is reduced section by section; the inner cavity of the cylinder body is provided with a plurality of cylinder body step holes with gradually reduced pore diameters from top to bottom. The upper joint outer step can axially position the depth of the upper joint inserted into the cylinder body, and can rotate when pressed on the upper port of the cylinder body, so that the embedding is realized; the upper joint and the cylinder body are reduced section by section from top to bottom, so that on one hand, turning processing is facilitated, and on the other hand, mutual matching among the sections is also facilitated.
As a further improvement of the invention, three upper joint convex blocks are uniformly arranged on the periphery of the large-diameter section of the upper joint below the outer step of the upper joint, the central angles of the upper joint convex blocks are 40 degrees respectively, L-shaped caulking grooves which are matched with the upper joint convex blocks are symmetrically arranged on the inner wall of the first barrel step hole at the upper end of the barrel, the upper end of each L-shaped caulking groove is opened, the central angle of the upper part is 40 degrees, the central angle of the lower part of each L-shaped caulking groove is 80 degrees, the total height of each L-shaped caulking groove is twice the height of the upper joint convex blocks, and each upper joint convex block is respectively embedded at the root part of the corresponding L-shaped caulking groove. The upper joint convex blocks are respectively inserted from the openings at the upper ends of the L-shaped caulking grooves, slide downwards to reach the bottoms of the L-shaped caulking grooves after corresponding to the heights of the upper joint convex blocks, and then rotate by 40 degrees, so that the upper joint convex blocks are completely embedded into the roots of the L-shaped caulking grooves. Because the total height of L shape caulking groove is the twice of top joint lug, and the central angle is the twice of top joint lug also, and the top of top joint lug inlays after putting in place, and its top is coincident with the roof of L shape caulking groove lower part completely, and axial positioning and radial positioning are very reliable, and the transmission pulling force and torque's ability is very big. When releasing, the upper joint reversely rotates for 40 degrees, and the pipe column can be lifted up to realize separation.
As a further improvement of the invention, an upper joint sealing section is arranged below the upper joint large-diameter section, at least two upper joint sealing grooves are arranged on the circumference of the upper joint sealing section, and an upper joint sealing ring is embedded in the upper joint sealing grooves and is attached to the inner wall of the step hole of the second cylinder body. The upper joint sealing ring can realize reliable sealing between the upper joint and the cylinder body, and the processing and the installation are convenient, and the upper joint sealing ring cannot be scratched by the inner wall of the cylinder body before being inserted into the step hole of the second cylinder body.
As a further improvement of the invention, the lower end of the upper joint sealing section is connected with an upper joint small-diameter section which is inserted into the upper part of the step hole of the third cylinder body, three upper joint slots which are concave inwards and open at the lower end are symmetrically arranged on the periphery of the upper joint small-diameter section, and the phases of the upper joint slots and the upper joint lugs on the circumference are staggered; the upper part of the sliding sleeve is provided with a sliding sleeve large-diameter section which is positioned in the middle of the step hole of the third cylinder body and is in clearance fit with the step hole of the third cylinder body, and three sliding sleeve tenons extending upwards are symmetrically arranged on the periphery of the upper port of the sliding sleeve large-diameter section, and each sliding sleeve tenon is correspondingly inserted into a corresponding upper joint slot; the central angles of the sliding sleeve tenons are 40 degrees respectively, and the central angles of the upper joint slots are 80 degrees respectively. Each sliding sleeve tenon is correspondingly inserted into the upper joint slot to form spline fit, the inner wall of each sliding sleeve tenon is abutted against the bottom wall of the upper joint slot, the coaxial line of the upper end of each sliding sleeve and the lower end of the upper joint is ensured, the side wall of each sliding sleeve tenon is contacted with the side wall of the upper joint slot to transfer torque, and the phases of the upper joint slot and the upper joint lug on the circumference are staggered to facilitate processing. The central angle of the upper joint slot is equal to that of the lower part of the L-shaped caulking groove, and the central angle of the sliding sleeve tenon is equal to that of the upper joint lug, so that the side wall of the sliding sleeve tenon is attached to the side wall of the upper joint slot when the upper joint lug is embedded into the root of the L-shaped caulking groove, and the state of transmitting torque is synchronously reached.
As a further improvement of the invention, the outer circumference of the large-diameter section of the sliding sleeve is symmetrically provided with three sliding sleeve sliding grooves which are penetrated along the axial direction, the central angles of the sliding sleeve sliding grooves are respectively 40 degrees, and the sliding sleeve sliding grooves and the sliding sleeve inserting tenons are mutually staggered in the circumferential direction; the inner wall of the upper part of the third cylinder step hole is symmetrically provided with three cylinder convex blocks protruding inwards, and the central angles of the cylinder convex blocks are 40 degrees respectively and are correspondingly embedded in corresponding sliding sleeve sliding grooves. Before the shear pins are sheared, the barrel protruding blocks are embedded in the sliding sleeve sliding grooves, so that radial positioning between the sliding sleeve and the barrel is realized, and torque can be transmitted; the sliding sleeve sliding chute and the sliding sleeve tenon are mutually staggered in the circumferential direction, so that the root of the sliding sleeve tenon can be prevented from being weakened. After the shear pins are sheared, the barrel body convex blocks are matched with the sliding sleeve sliding grooves, so that the sliding sleeve slides downwards along the axial direction.
As a further improvement of the invention, a small-diameter sliding sleeve section is connected below the large-diameter sliding sleeve section, the upper part of the small-diameter sliding sleeve section is positioned in the third cylinder step hole, the lower part of the middle part of the small-diameter sliding sleeve section is positioned in the fourth cylinder step hole, at least two sliding sleeve sealing grooves are arranged in the middle part of the small-diameter sliding sleeve section, sliding sleeve sealing rings are respectively embedded in the sliding sleeve sealing grooves, and the sliding sleeve sealing rings are attached to the inner wall of the fourth cylinder step hole. The upper part of the small-diameter section of the sliding sleeve is positioned in the step hole of the third cylinder body, so that the bottom of the large-diameter section of the sliding sleeve is higher than the step of the step hole of the third cylinder body by a distance, and space is provided for the sliding of the large-diameter section of the sliding sleeve and the disengagement of the sliding sleeve mortise during releasing. The sliding sleeve sealing ring realizes the sealing between the sliding sleeve and the inner wall of the cylinder body, and has no scratch with the inner wall of the cylinder body on the upper part.
As a further improvement of the invention, two shear pin screw holes are symmetrically arranged on the circumference of the lower part of the cylinder body, the shear pins are respectively screwed in the two shear pin screw holes, the inner ends of the two shear pins are respectively inserted into the shear pin counter bores of the sliding sleeve, and the height of the shear pin counter bores is equal to the height of the throat part below the ball seat. The wall thickness of the throat part is thickest, the strength is highest, and the arrangement of the shear pin counter bore is facilitated; the inner end head of the shear pin is inserted into a shear pin counter bore of the sliding sleeve, and the sliding sleeve is fixed on the cylinder; when the sliding sleeve bears enough pressure, the shear pins are sheared off.
As a further improvement of the invention, two sliding sleeve limiting long grooves extending upwards along the axial direction are symmetrically arranged on the circumference of the lower part of the small-diameter section of the sliding sleeve, and the axial height of the sliding sleeve limiting long grooves is larger than the height of the sliding sleeve tenon; limiting pins are symmetrically screwed on the circumference of the cylinder body, the limiting pins and the shear pins are located on the same circumference and staggered by 90 degrees, and inner end heads of the limiting pins are respectively inserted into corresponding sliding sleeve limiting long grooves. The inner end heads of the limiting pins are symmetrically inserted into the limiting long grooves of the sliding sleeve, so that the sliding sleeve can only slide downwards along a straight line, namely, the sliding sleeve cannot rotate in the sliding process; after maintenance, the shear pins are screwed on the cylinder body again, the inner end heads of the shear pins are very easy to align with the shear pin counter bores of the sliding sleeve, the phases of the sliding sleeve tenons and the sliding sleeve sliding grooves are not changed, and the trouble of rotation alignment is avoided.
As a further improvement of the invention, a cylinder pressure relief groove with an enlarged inner diameter is arranged on the inner wall of a fourth cylinder step hole above the shear pin screw hole, when the lower step of the large-diameter section of the sliding sleeve is propped against the upper step of the fourth cylinder step hole, the sliding sleeve sealing ring is positioned in the cylinder pressure relief groove, and the top of the sliding sleeve mortise is separated from the upper joint slot; a fifth cylinder step hole is arranged below the fourth cylinder step hole. After the steel throw ball is put into the tubular column, the ball seat is set, the central pore canal is pressed to release pressure, the shear pins are sheared, after the sliding sleeve slides downwards, the sliding sleeve mortise and tenon is separated from the upper joint slot, the sliding sleeve sealing ring reaches the pressure relief groove of the cylinder body, so that the hydraulic pressure above the cylinder body is relieved, and a ground operator can continuously release the tubular column by judging the hydraulic pressure, namely reversely rotating the upper joint by 40 degrees, and then lifting the tubular column to realize separation. The fifth cylinder step hole with smaller inner diameter is arranged below the fourth cylinder step hole and used as a central hole of the lower joint, so that the sliding sleeve can be prevented from sliding into a pipe column below.
Drawings
The invention will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the invention.
FIG. 1 is a front view of a hydraulic micro-swivel safety joint for a down-hole string of the present invention.
Fig. 2 is a cross-sectional view of the upper joint of fig. 1.
Fig. 3 is a perspective view of the upper connector of fig. 1.
Fig. 4 is a second perspective view of the upper connector of fig. 1.
Fig. 5 is a cross-sectional view of the cartridge of fig. 1.
Fig. 6 is a perspective cross-sectional view of the cartridge of fig. 1.
Fig. 7 is a cross-sectional view of the sliding sleeve of fig. 1.
Fig. 8 is a perspective view of the sliding sleeve of fig. 1.
Fig. 9 is a cross-sectional view of fig. 8.
Fig. 10 is a second perspective view of the sliding sleeve of fig. 1.
In the figure: 1. an upper joint; 1a, an upper joint outer step; 1b, an upper joint large-diameter section; 1b1. Upper joint bump; 1c, an upper joint sealing section; 1c1, sealing a sealing groove of an upper joint; 1c2, an upper joint sealing ring; 1d, an upper joint small-diameter section; 1d1, an upper joint slot; 1e, conical female threads; 2. a cylinder; 2a, a first cylinder step hole; 2a1.l-shaped caulking groove; 2b, a second cylinder step hole; 2c, a third cylinder step hole; 2c1, a cylinder bump; 2d, a fourth cylinder step hole; 2d1, shear pin screw holes; 2d2, a cylinder body pressure relief groove; 2e, a fifth cylinder step hole; 3. a lower joint; 3a, conical male threads; 4. a sliding sleeve; 4a, sliding sleeve tenon insertion; 4b, sliding a large-diameter section of the sleeve; 4b1, sliding a sliding sleeve chute; 4c, sliding sleeve small diameter section; 4c1, sliding sleeve sealing grooves; 4c2, sliding the sealing ring; 4c3, shearing a counterbore; 4c4, sliding sleeve limiting long groove; 4d, ball seat; 5. shearing nails; 6. limit pins; 7. steel ball throwing.
Detailed Description
As shown in fig. 1 to 10, the hydraulic micro-screwing safety joint for a down-hole pipe column of the present invention comprises an upper joint 1 and a lower joint 3, wherein the upper inner cavity of the upper joint 1 is provided with a conical female thread 1e screwed with an upper square pipe column, and the outer end of the lower joint 3 is provided with a conical male thread 3a screwed with a lower pipe column. The central holes of the upper joint 1 and the lower joint 3 are coaxial and mutually communicated, the upper end of the lower joint 3 is provided with a cylinder body 2 extending upwards, a sliding sleeve 4 capable of axially sliding along the inner wall of the cylinder body 2 is arranged in the inner cavity of the cylinder body 2, the central hole of the sliding sleeve 4 is gradually reduced from top to bottom, the lower end of the sliding sleeve is provided with a bell-mouth-shaped ball seat 4d, the ball seat 4d is matched with a steel ball throwing ball 7 capable of closing the ball seat, and the throat opening at the lower end of the ball seat 4d is communicated with the central hole of the lower joint 3; the outer wall of the lower end of the sliding sleeve 4 is fixed on the cylinder body 2 through a shear pin 5, the lower part of the upper joint 1 is inserted into the cylinder body 2 and is embedded with the inner wall of the cylinder body 2 after rotating, and the lower end of the upper joint 1 is inserted with the upper end of the sliding sleeve 4 through a spline.
When the upper joint is assembled, the sliding sleeve 4 is firstly put into the cylinder body 2, then the lower end of the upper joint 1 is inserted into the inner cavity of the cylinder body 2, and then the upper joint 1 is rotated to enable the lower part of the upper joint 1 to be embedded with the inner wall of the cylinder body 2, so that the upper joint 1 and the cylinder body 2 can bear axial tension and can transmit torque; the sliding sleeve 4 is then lifted up, the upper end of the sliding sleeve 4 is connected with the lower end of the upper joint 1 through a spline, and then the sliding sleeve 4 is fixed on the cylinder 2 through the shear pins 5, so that the sliding sleeve 4 limits the rotation of the upper joint 1 and provides torque. When the safety joint is required to be lost, the steel ball 7 is thrown into the pipe column, the steel ball 7 falls on the ball seat 4d to be seated, the central pore canal is closed to generate pressure holding, when the pressure holding reaches 10MPa, the shear pin 5 is sheared off, the sliding sleeve 4 slides downwards to be separated from the upper joint 1, the upper joint 1 is reversely rotated to be separated from the inner wall of the cylinder body 2, and then the upper joint 1 can be pulled upwards to realize releasing. Because the upper joint 1 and the cylinder body 2 are not in threaded connection, but are mutually embedded, the mutual binding force is small, the friction resistance and well deviation influence of the pipe column and the casing wall are avoided when releasing, and the upper joint 1 can be tripped by only throwing the steel throw-in ball 7 and slightly rotating the upper joint, so that the upper joint has high tripping success rate, convenient operation and reliable performance.
An upper joint outer step 1a is arranged in the middle section of the upper joint 1, the upper joint outer step 1a is pressed on the upper port of the cylinder 2, and the diameter of the part below the upper joint outer step 1a is reduced section by section; the inner cavity of the cylinder body 2 is provided with a plurality of cylinder body step holes with gradually reduced pore diameters from top to bottom. The upper joint outer step 1a can axially position the depth of the upper joint 1 inserted into the cylinder 2, and the upper joint outer step 1a can rotate when pressed on the upper port of the cylinder 2, so that the embedding is realized; the upper joint 1 and the cylinder body 2 are reduced from top to bottom, so that on one hand, turning processing is facilitated, and on the other hand, mutual matching among the sections is facilitated.
Three upper joint convex blocks 1b1 are uniformly arranged on the periphery of the upper joint large-diameter section 1b below the upper joint outer step 1a, the central angle of each upper joint convex block 1b1 is 40 degrees, the inner wall of the first barrel step hole 2a at the upper end of the barrel 2 is symmetrically provided with L-shaped caulking grooves 2a1 which are matched with the upper joint convex blocks 1b1, the upper end of each L-shaped caulking groove 2a1 is opened, the central angle of the upper part is 40 degrees, the central angle of the lower part of each L-shaped caulking groove 2a1 is 80 degrees, the total height of each L-shaped caulking groove 2a1 is twice the height of each upper joint convex block 1b1, and each upper joint convex block 1b1 is respectively embedded at the root of the corresponding L-shaped caulking groove 2a 1.
Each upper joint lug 1b1 is inserted from an opening at the upper end of the L-shaped caulking groove 2a1, slides down to the bottom of the L-shaped caulking groove 2a1 after corresponding to the height of the upper joint lug 1b1, and then rotates by 40 degrees, so that the upper joint lug 1b1 is completely embedded into the root of the L-shaped caulking groove 2a 1. Because the total height of the L-shaped caulking groove 2a1 is twice that of the upper joint lug 1b1, the central angle is twice that of the upper joint lug 1b1, and after the upper joint lug 1b1 is embedded in place, the top of the upper joint lug is completely overlapped with the top wall of the lower part of the L-shaped caulking groove 2a1, the axial positioning and the radial positioning are very reliable, and the capability of transmitting the tensile force and the torque is very large. When releasing, the upper joint 1 reversely rotates for 40 degrees, and the pipe column can be lifted up to realize the separation.
An upper joint sealing section 1c is arranged below the upper joint large-diameter section 1b, at least two upper joint sealing grooves 1c1 are arranged on the circumference of the upper joint sealing section 1c, and an upper joint sealing ring 1c2 is embedded in the upper joint sealing groove 1c1 and is attached to the inner wall of the second cylinder step hole 2 b. The upper joint sealing ring 1c2 can realize reliable sealing between the upper joint 1 and the cylinder 2, and the processing and the installation are convenient, and the upper joint sealing ring 1c2 can not be scratched by the inner wall of the cylinder 2 before being inserted into the second cylinder step hole 2 b.
The lower end of the upper joint sealing section 1c is connected with an upper joint small-diameter section 1d, the upper joint small-diameter section 1d is inserted into the upper part of the third cylinder step hole 2c, three upper joint slots 1d1 which are concave inwards and are open at the lower end are symmetrically arranged on the periphery of the upper joint small-diameter section 1d, and the phases of the upper joint slots 1d1 and the upper joint lugs 1b1 on the circumference are staggered; the upper part of the sliding sleeve 4 is provided with a sliding sleeve large-diameter section 4b, the sliding sleeve large-diameter section 4b is positioned in the middle of the third cylinder step hole 2c and is in clearance fit with the third cylinder step hole, three sliding sleeve tenons 4a extending upwards are symmetrically arranged on the periphery of the upper port of the sliding sleeve large-diameter section 4b, and each sliding sleeve tenon 4a is correspondingly inserted in a corresponding upper joint slot 1d 1; the central angles of the sliding sleeve tenons 4a are 40 degrees respectively, and the central angles of the upper joint slots 1d1 are 80 degrees respectively.
Each sliding sleeve mortise 4a is correspondingly spliced in the upper joint slot 1d1 to form spline fit, the inner wall of the sliding sleeve mortise 4a is abutted against the bottom wall of the upper joint slot 1d1, the upper end of the sliding sleeve 4 and the lower end of the upper joint 1 are coaxial, the side wall of the sliding sleeve mortise 4a is contacted with the side wall of the upper joint slot 1d1 to transfer torque, and the phases of the upper joint slot 1d1 and the upper joint lug 1b1 on the circumference are staggered to facilitate processing. The central angle of the upper joint slot 1d1 is equal to the central angle of the lower part of the L-shaped caulking groove 2a1, and the central angle of the sliding sleeve mortise 4a is equal to the central angle of the upper joint lug 1b1, so that the side wall of the sliding sleeve mortise 4a is attached to the side wall of the upper joint slot 1d1 while the upper joint lug 1b1 is embedded into the root of the L-shaped caulking groove 2a1, and the state of transmitting torque is synchronously reached.
The outer circumference of the large-diameter section 4b of the sliding sleeve is symmetrically provided with three sliding sleeve sliding grooves 4b1 which are communicated in the axial direction, the central angles of the sliding sleeve sliding grooves 4b1 are respectively 40 degrees, and the sliding sleeve sliding grooves and the sliding sleeve inserting tenons 4a are mutually staggered in the circumferential direction; three cylinder projections 2c1 protruding inwards are symmetrically arranged on the inner wall of the upper part of the third cylinder step hole 2c, and the central angles of the cylinder projections 2c1 are 40 degrees respectively and are correspondingly embedded in the corresponding sliding sleeve sliding chute 4b 1. Before the shear pins 5 shear, the cylinder body convex blocks 2c1 are embedded in the sliding sleeve sliding grooves 4b1, so that radial positioning between the sliding sleeve 4 and the cylinder body 2 is realized and torque can be transmitted; the sliding sleeve sliding groove 4b1 and the sliding sleeve inserting tenon 4a are mutually staggered in the circumferential direction, so that the root of the sliding sleeve inserting tenon 4a can be prevented from being weakened. After the shear pin 5 is sheared, the cylinder body lug 2c1 is matched with the sliding sleeve chute 4b1, so that the sliding sleeve 4 slides downwards along the axial direction.
The sliding sleeve small diameter section 4c is connected with the below of sliding sleeve major diameter section 4b, and the upper portion of sliding sleeve small diameter section 4c is arranged in third barrel step hole 2c, and the middle part of sliding sleeve small diameter section 4c is arranged in fourth barrel step hole 2d below, and the middle part of sliding sleeve small diameter section 4c is equipped with at least twice sliding sleeve seal groove 4c1, inlays respectively in the sliding sleeve seal groove 4c1 and is equipped with sliding sleeve sealing washer 4c2, and the laminating of sliding sleeve sealing washer 4c2 is at the inner wall in fourth barrel step hole 2 d. The upper part of the small diameter section 4c of the sliding sleeve is positioned in the step hole 2c of the third cylinder body, so that the bottom of the large diameter section 4b of the sliding sleeve is higher than the step of the step hole 2c of the third cylinder body by a certain distance, and space is provided for the sliding of the large diameter section 4b of the sliding sleeve and the disengagement of the sliding sleeve mortise 4a during releasing. The sliding sleeve sealing ring 4c2 realizes the sealing between the sliding sleeve 4 and the inner wall of the cylinder body 2, and no scratch is generated between the sliding sleeve and the inner wall of the cylinder body 2 at the upper part.
Two shear pin screw holes 2d1 are symmetrically arranged on the circumference of the lower part of the cylinder body 2, shear pins 5 are respectively screwed in the two shear pin screw holes 2d1, the inner end heads of the two shear pins 5 are respectively inserted into shear pin counter bores 4c3 of the sliding sleeve 4, and the height of the shear pin counter bores 4c3 is equal to the height of the throat part below the ball seat 4 d. The wall thickness of the throat part is thickest, the strength is highest, and the arrangement of the shear pin counter bore 4c3 is facilitated; the inner end head of the shear pin 5 is inserted into a shear pin counter bore 4c3 of the sliding sleeve 4, and the sliding sleeve 4 is fixed on the cylinder 2; when the pressure to which the sliding sleeve 4 is subjected is sufficiently great, the shear pin 5 will shear.
Two sliding sleeve limiting long grooves 4c4 extending upwards along the axial direction are symmetrically arranged on the circumference of the lower part of the small-diameter sliding sleeve section 4c, and the axial height of each sliding sleeve limiting long groove 4c4 is greater than the height of each sliding sleeve tenon 4 a; limiting pins 6 are symmetrically screwed on the circumference of the cylinder body 2, the limiting pins 6 and the shear pins 5 are positioned on the same circumference and staggered by 90 degrees, and the inner end heads of the limiting pins 6 are respectively inserted into corresponding sliding sleeve limiting long grooves 4c 4. The inner end heads of the limit pins 6 are symmetrically inserted into the limit long grooves 4c4 of the sliding sleeve, so that the sliding sleeve 4 can only slide downwards along a straight line, namely, the sliding sleeve cannot rotate in the sliding process; after maintenance, the shear pins 5 are screwed on the cylinder body 2 again, the inner end heads of the shear pins 5 are very easy to align with the shear pin counter bores 4c3 of the sliding sleeve 4, the phases of the sliding sleeve mortise 4a and the sliding sleeve chute 4b1 are not changed, and the trouble of rotation alignment is avoided.
The inner wall of the fourth cylinder step hole 2d above the shear pin screw hole 2d1 is provided with a cylinder pressure relief groove 2d2 with an enlarged inner diameter, when the lower step of the large-diameter section 4b of the sliding sleeve is abutted against the upper step of the fourth cylinder step hole 2d, the sliding sleeve sealing ring 4c2 is positioned in the cylinder pressure relief groove 2d2, and the top of the sliding sleeve mortise 4a is separated from the upper joint slot 1d1; a fifth cylinder step hole 2e is provided below the fourth cylinder step hole 2 d. After the steel ball 7 is thrown into the pipe column, the ball seat 4d is set, the central pore canal is pressed to release pressure, the shear pin 5 is sheared, after the sliding sleeve 4 slides downwards, the sliding sleeve tenon 4a is separated from the upper joint slot 1d1, the sliding sleeve sealing ring 4c2 reaches the cylinder pressure relief groove 2d2, so that the hydraulic pressure above the cylinder pressure relief groove is relieved, a ground operator can continuously release the pipe by judging the hydraulic pressure, namely, reversely rotating the upper joint for 40 degrees, and then lifting the pipe column to realize separation. A fifth cylinder step hole 2e with smaller inner diameter is arranged below the fourth cylinder step hole 2d and is used as a center hole of the lower joint 3, so that the sliding sleeve 4 can be prevented from sliding into a pipe column below.
The above is only a preferred practical embodiment of the present invention, and is not limited to the scope of the present invention. In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention. The technical features of the present invention that are not described may be implemented by or using the prior art, and are not described herein.
Claims (4)
1. The utility model provides a little safe joint of revolve of hydraulic pressure for tubular column in pit, includes upper joint and lower joint, the centre bore coaxial line of upper joint and lower joint just link up each other, its characterized in that: the upper end of the lower joint is provided with an upward extending cylinder body, the inner cavity of the cylinder body is provided with a sliding sleeve capable of axially sliding along the inner wall of the cylinder body, the central hole of the sliding sleeve is gradually reduced from top to bottom, the lower end of the sliding sleeve is provided with a bell-mouth-shaped ball seat, the ball seat is matched with a steel ball which can be closed, and the throat at the lower end of the ball seat is communicated with the central hole of the lower joint; the outer wall of the lower end of the sliding sleeve is fixed on the cylinder body through a shear pin, the lower part of the upper joint is inserted into the cylinder body and is embedded with the inner wall of the cylinder body after rotating, and the lower end of the upper joint is inserted into the upper end of the sliding sleeve through a spline;
The middle section of the upper joint is provided with an upper joint outer step, the upper joint outer step is pressed on the upper port of the cylinder body, and the diameter of the part below the upper joint outer step is reduced section by section; the inner cavity of the cylinder is provided with a plurality of cylinder step holes with gradually reduced pore diameters from top to bottom;
Three upper joint convex blocks are uniformly arranged on the periphery of the large-diameter section of the upper joint below the outer step of the upper joint, the central angle of each upper joint convex block is 40 degrees, the inner wall of the first barrel step hole at the upper end of the barrel is symmetrically provided with L-shaped caulking grooves matched with the upper joint convex blocks, the upper end of each L-shaped caulking groove is opened, the central angle of the upper part is 40 degrees, the central angle of the lower part of each L-shaped caulking groove is 80 degrees, the total height of each L-shaped caulking groove is twice the height of each upper joint convex block, and each upper joint convex block is respectively embedded at the root part of the corresponding L-shaped caulking groove;
An upper joint sealing section is arranged below the upper joint large-diameter section, at least two upper joint sealing grooves are formed in the circumference of the upper joint sealing section, and an upper joint sealing ring is embedded in the upper joint sealing grooves and is attached to the inner wall of the step hole of the second cylinder body;
The lower end of the upper joint sealing section is connected with an upper joint small-diameter section which is inserted into the upper part of the third cylinder step hole, three upper joint slots which are concave inwards and open at the lower end are symmetrically arranged on the periphery of the upper joint small-diameter section, and the phases of the upper joint slots and the upper joint lugs on the circumference are staggered; the upper part of the sliding sleeve is provided with a sliding sleeve large-diameter section which is positioned in the middle of the step hole of the third cylinder body and is in clearance fit with the step hole of the third cylinder body, and three sliding sleeve tenons extending upwards are symmetrically arranged on the periphery of the upper port of the sliding sleeve large-diameter section, and each sliding sleeve tenon is correspondingly inserted into a corresponding upper joint slot; the central angles of the sliding sleeve tenons are 40 degrees respectively, and the central angles of the upper joint slots are 80 degrees respectively;
Three sliding sleeve sliding grooves which are communicated in the axial direction are symmetrically arranged on the outer circumference of the large-diameter section of the sliding sleeve, the central angles of the sliding sleeve sliding grooves are 40 degrees respectively, and the sliding sleeve sliding grooves and the sliding sleeve tenons are mutually staggered in the circumferential direction; three cylinder protruding blocks protruding inwards are symmetrically arranged on the inner wall of the upper part of the third cylinder step hole, and the central angles of the cylinder protruding blocks are 40 degrees respectively and are correspondingly embedded in corresponding sliding sleeve sliding grooves;
the lower part of the sliding sleeve major diameter section is connected with a sliding sleeve minor diameter section, the upper portion of the sliding sleeve minor diameter section is arranged in the third cylinder step hole, the lower part of the middle part of the sliding sleeve minor diameter section is arranged in the fourth cylinder step hole, the middle part of the sliding sleeve minor diameter section is provided with at least two sliding sleeve sealing grooves, sliding sleeve sealing rings are respectively embedded in the sliding sleeve sealing grooves, and the sliding sleeve sealing rings are attached to the inner wall of the fourth cylinder step hole.
2. The hydraulic micro-swivel safety joint for a down-hole pipe string according to claim 1, wherein: two shear pin screw holes are symmetrically formed in the circumference of the lower portion of the cylinder body, the shear pins are respectively screwed in the two shear pin screw holes, inner end heads of the two shear pins are respectively inserted into shear pin counter bores of the sliding sleeve, and the shear pin counter bores are equal in height to the throat opening part below the ball seat in the height direction.
3. The hydraulic micro-swivel safety joint for a down-hole pipe string according to claim 2, wherein: two sliding sleeve limiting long grooves extending upwards along the axial direction are symmetrically arranged on the circumference of the lower part of the small-diameter section of the sliding sleeve, and the axial height of each sliding sleeve limiting long groove is greater than the height of each sliding sleeve tenon; limiting pins are symmetrically screwed on the circumference of the cylinder body, the limiting pins and the shear pins are located on the same circumference and staggered by 90 degrees, and inner end heads of the limiting pins are respectively inserted into corresponding sliding sleeve limiting long grooves.
4. The hydraulic micro-swivel safety joint for a down-hole pipe string according to claim 2, wherein: the inner wall of the fourth cylinder step hole above the shear pin screw hole is provided with a cylinder pressure relief groove with an enlarged inner diameter, when the lower step of the large-diameter section of the sliding sleeve is propped against the upper step of the fourth cylinder step hole, the sliding sleeve sealing ring is positioned in the cylinder pressure relief groove, and the top of the sliding sleeve mortise is separated from the upper joint slot; a fifth cylinder step hole is arranged below the fourth cylinder step hole.
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| CN201811207389.1A CN109138857B (en) | 2018-10-17 | 2018-10-17 | Hydraulic micro-rotation safety joint for downhole tubular column |
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| CN201811207389.1A CN109138857B (en) | 2018-10-17 | 2018-10-17 | Hydraulic micro-rotation safety joint for downhole tubular column |
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| CN109854213B (en) * | 2019-03-18 | 2023-05-30 | 中国石油化工股份有限公司 | Sand control tubular column of casing damage repair well |
| CN109869120A (en) * | 2019-03-18 | 2019-06-11 | 中国石油化工股份有限公司 | The sand control back-up sand system of large cased well |
| CN112727379A (en) * | 2019-10-28 | 2021-04-30 | 中国石油化工股份有限公司 | Underground pipe column locking connector and construction method thereof |
| CN114985224B (en) * | 2022-07-08 | 2023-06-20 | 沈阳芯源微电子设备股份有限公司 | Waste discharge mechanism and photoresist coating platform |
| CN115788326B (en) * | 2023-02-07 | 2023-04-14 | 山东华冠能源技术有限公司 | Hydraulic micro-rotation safety joint for downhole pipe column |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208870548U (en) * | 2018-10-17 | 2019-05-17 | 中国石油化工股份有限公司 | The hydraulic micro- rotation safety joint of down-hole string |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AU748101B2 (en) * | 1998-01-29 | 2002-05-30 | Baker Hughes Incorporated | Downhole connector for production tubing and control line and method |
| CN101624904B (en) * | 2009-08-14 | 2012-07-25 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof |
| CN202170760U (en) * | 2011-07-15 | 2012-03-21 | 中国石油天然气集团公司 | Downhole hydraulic safety connector |
| US8985230B2 (en) * | 2011-08-31 | 2015-03-24 | Baker Hughes Incorporated | Resettable lock for a subterranean tool |
| CN204851091U (en) * | 2015-07-14 | 2015-12-09 | 中国石油天然气股份有限公司 | Releasing joint capable of transmitting torque |
| CN105443057B (en) * | 2015-12-08 | 2018-10-16 | 中国石油天然气集团公司 | Bearing torque formula Double-acting releasing tool |
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| CN208870548U (en) * | 2018-10-17 | 2019-05-17 | 中国石油化工股份有限公司 | The hydraulic micro- rotation safety joint of down-hole string |
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