CN111894510B

CN111894510B - Combined rubber-cylinder type two-stage ultrahigh pressure sealing packer

Info

Publication number: CN111894510B
Application number: CN202010833912.2A
Authority: CN
Inventors: 董亮亮; 刘金磊
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2022-03-25
Anticipated expiration: 2040-08-18
Also published as: CN111894510A

Abstract

The invention relates to a combined rubber sleeve type two-stage ultrahigh pressure sealing packer which mainly comprises a setting and placing beam claw, a locker I, an end rubber sleeve, a spacer ring, a middle rubber sleeve, a locker II, a clamping ring, a central pipe, a cone and a slip, and is characterized in that an inner pipe is connected with an upper joint and the setting and placing beam claw through threads; the shell joint is connected with the shell I and the shell II through threads; the shell III is arranged on the outer side of the sitting and placing binding claw; the sitting and placing restraining claw is sleeved outside the sitting and placing short section; the locker I is arranged on the outer side of the shell III; the locking seat is connected with the central pipe through threads; the end rubber cylinder, the middle rubber cylinder and the partition ring form a rubber cylinder group; the clamping ring is positioned between the locker II and the central pipe; the slips are positioned between the cone and the slip table and fixed on the slip table; the lower end of the central pipe is connected with the slip table and the lower joint through threads. The invention is suitable for working in an ultrahigh pressure environment, and can effectively improve the sealing pressure and the working reliability of the packer.

Description

Combined rubber-cylinder type two-stage ultrahigh pressure sealing packer

Technical Field

The invention relates to a combined rubber-cylinder two-stage ultrahigh pressure sealing packer, in particular to an underground packer suitable for ultrahigh pressure environment, belonging to the technical field of underground tools for oil and gas field development.

Background

The packer has extensive application in oil gas development field, utilizes the better sealing element of self elasticity to seal certain space, can completely cut off and produce liquid and pressure and target layer to can control and produce liquid, protective case. Most of packers in the prior art are designed by a single set of rubber cylinders, the pressure resistance is low, the rubber cylinders are easy to lose effectiveness in an ultrahigh pressure environment, the service life of the packer is shortened, and the oil gas exploitation effect is seriously affected, so that the ultrahigh pressure resistant packer is urgently needed.

Patent 201020685541.X the open valve formula expansion packer, open valve and single current valve combined application, make the opening pressure control of packer close to the setting pressure, prevent effectively that packer in-process from setting in advance, the single current valve makes the one-way inflow of liquid seal packing element and prevent the backward flow, makes the packing element fully expand, and the leakproofness is better, has certain high pressure resistance ability, nevertheless singly organizes the problem that the packing element is resistant to the superhigh pressure.

Patent 201821348140.8 the packer, pour into fluid and pressure boost into through the tubular column, promote inlayer pipe upward movement, outer pipe downward movement, the tight top of slips is on sheathed tube pipe wall, the extrusion force that the increase packing element received makes the packer produce great setting power, nevertheless singly organize the packing element and still not solve the problem of the resistant superhigh pressure of packer.

Along with the development of the drilling technology and the increase of the difficulty of oil and gas exploitation, the underground condition is more and more complex, and the service performance and the requirement on the packer are higher and higher, so that a combined rubber-cylinder type two-stage ultrahigh pressure sealing packer is urgently needed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a combined rubber-cylinder type two-stage ultrahigh-pressure sealing packer which can effectively improve the pressure resistance of the underground work of the packer and adapt to a more severe environment.

In order to achieve the purpose, the technical scheme for solving the problem is as follows:

the invention relates to a combined rubber sleeve type two-stage ultrahigh pressure sealing packer which mainly comprises an inner pipe, a shell joint, a setting and placing bundling claw, a locker I, a locking seat, an end rubber sleeve I, a spacer ring I, a middle rubber sleeve I, a locker II, a clamping ring, a central pipe, a cone, a slip and a lower joint, and is characterized in that the upper end of the inner pipe is connected with the upper joint through threads, and the lower end of the inner pipe is connected with the setting and placing bundling claw through threads, and the outer side of the lower end of the inner pipe is provided with two O-shaped sealing rings A; the upper end of the shell joint is connected with the shell I through threads, the lower end of the shell joint is connected with the shell II through threads, and two O-shaped sealing rings B are arranged on the inner sides of the shell joint; the upper end of the shell III is in interference fit with the outer side of the sitting and placing restraining claw and is fixed by a fixed-load pin I; the sitting and placing restraining claw is sleeved outside the sitting and placing short section and is fixed by a fixed-load pin II; the upper end of the locker I is in interference fit with the outer side of the shell III and is positioned between the shell III and the first rubber cylinder seat; the upper end of the locking seat is arranged outside the sitting and placing bundling claw, and the lower end of the locking seat is connected with the central pipe through threads; the middle rubber cylinder I, the two end rubber cylinders I and the fixed spacer rings I arranged at intervals form a first-stage rubber cylinder group, are positioned between the two rubber cylinder seats I and are separated by the two anti-bulge rings I; the clamping ring is positioned between the locker II and the central tube and is adjacent to the rubber cylinder seat II; middle rubber cylinder II, two end rubber cylinders II and fixing spacers arranged at intervals

The ring group is a second-stage rubber cylinder group which is positioned between the second rubber cylinder seat and the cone and is separated by two anti-bulge rings; the slips are sleeved on the central pipe, positioned between the cone and the slip table and fixedly connected to the slip table; the slip table is connected with the central pipe through threads; the lower joint is connected with the lower end of the central pipe through threads.

The slips are single-cone multi-petal slips, the number of slip petals is 4-8, the slip teeth are zigzag, 5-20 slip teeth are arranged on each slip, the tooth height h is 2-4 mm, the tooth width a is 8-12 mm, the tooth top width b is 1-2 mm, the tooth root width c is 1-2 mm, the tooth inclination angle alpha is 25-30 degrees, and the tooth top angle beta is 90-100 degrees.

The friction angle phi between the cone and the slip is 20-25 degrees, the slip cone angle gamma is 13-15 degrees, a self-locking relation is formed, and the cone and the central pipe are in interference fit with the outer side.

The packing element seat promotes first order packing element group and locker II and the downward axial displacement of second level packing element group, and then makes the cone move down, and the cone extrudees the slips for the slips pressurized gradually expands, and the two-stage packing element group receives pressure expansion, realizes sealedly, and the zigzag thread of I inner wall of locker cooperatees with the zigzag thread of locking seat surface to and the zigzag thread of II inner walls of locker cooperatees with the zigzag thread of snap ring surface, accomplishes the locking action, realizes the seat and seals.

After the fixed-load pin II is cut off, the setting short section moves downwards, the pipe column is lifted upwards, the setting restraining claw moves upwards, the setting short section is driven to set the locking seat step by step, and the setting process is completed.

And lifting the pipe column, moving the locking seat upwards, driving the central pipe to move, separating the locking seat from the sawtooth threads of the locking device I matched with the locking seat, separating the locking device II from the sawtooth threads of the clamping ring matched with the locking device I, and realizing gradual deblocking to finish deblocking actions.

Compared with the prior art, the invention has the advantages that 1, the combined two-stage rubber sleeve group is arranged, the whole operation of the packer can not be influenced after a certain group of rubber sleeves is failed, and the other group of rubber sleeves undertakes the packing function; 2. the locking seat and the zigzag threads of the locking device I matched with the locking seat as well as the zigzag threads of the locking device II matched with the clamping ring are locked by the threads at two positions, so that the working reliability of the packer can be improved; 3. the two-stage rubber sleeve group bears pressure, so that the packer has higher sealing pressure when working.

The packer is suitable for working in an ultrahigh pressure environment, can effectively improve the oil gas exploitation efficiency, reduces risks in the construction process, and prolongs the service life of the packer.

Drawings

FIG. 1 is a schematic structural diagram of a combined rubber-drum two-stage ultrahigh pressure sealing packer of the invention;

FIG. 2 is a schematic structural diagram of a combined rubber-drum two-stage ultrahigh pressure sealing packer of the invention after setting;

FIG. 3 is a schematic view of the structure of the cone (19);

FIG. 4 is a schematic cross-sectional view of the slip (20);

in the figure, 1 is an upper joint, 2 is a shell I, 3 is an inner pipe, 4 is a shell joint, 5 is a shell II, 6 is a shell III, 7 is a setting and placing clamping claw, 8 is a setting short section, 9 is a locker I, 10 is a locking seat, 11 is a rubber cylinder seat I, 110 is a rubber cylinder seat II, 12 is an end rubber cylinder I, 120 is an end rubber cylinder II, 13 is a spacer ring I, 130 is a spacer ring II, 14 is a middle rubber cylinder I, 140 is a middle rubber cylinder II, 15 is an anti-protruding ring I, 150 is an anti-protruding ring II, 16 is a locker II, 17 is a clamping ring, 18 is a central pipe, 19 is a cone, 20 is a slip, 21 is a slip table, 22 is a lower joint, 23 is a fixed load pin II, 24 is a fixed load pin I, 25 is an O-type sealing ring A, 26 is an O-type sealing ring B.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, 2, 3 and 4, the combined rubber-cylinder two-stage ultrahigh pressure sealing packer mainly comprises an inner pipe 3, a shell joint 4, a setting and releasing clamping claw 7, a locker I9, a locking seat 10, an end rubber cylinder I12, a spacer ring I13, a middle rubber cylinder I14, a locker II 16, a snap ring 17, a central pipe 18, a cone 19, a slip 20 and a lower joint 22, and is characterized in that the upper end of the inner pipe 3 is connected with the upper joint 1 through threads, and the lower end of the inner pipe is connected with the setting and releasing clamping claw 7 through threads, and two O-shaped sealing rings A25 are arranged on the outer side of the inner pipe; the upper end of the shell joint 4 is connected with the shell I through threads, the lower end of the shell joint is connected with the shell II 5 through threads, and two O-shaped sealing rings B26 are arranged on the inner side of the shell joint; the upper end of the shell III 6 is in interference fit with the sitting and placing beam claw 7 on the outer side and is fixed by a fixed-load pin I24; the sitting and placing beam claw 7 is sleeved outside the sitting and placing short section 8 and is fixed by a load-fixing pin II 23; the upper end of the locker I9 is in interference fit with the outer side of the shell III 6 and is positioned between the shell III 6 and the first rubber cylinder seat 11; the upper end of the locking seat 10 is arranged outside the sitting and placing binding claw 7, and the lower end of the locking seat is connected with the central pipe 18 through threads; the middle rubber cylinder I14, the two end rubber cylinders I12 and the two fixed spacing rings I13 which are arranged at intervals form a first-stage rubber cylinder group, are positioned between the two rubber cylinder seats I11 and are separated by the two anti-bulge rings I15; the snap ring 17 is positioned between the locker II 16 and the central tube 18 and is adjacent to the second rubber cylinder seat 110; the middle rubber cylinder II 140, the two end rubber cylinders II 120 and the two fixed spacer rings II 130 which are arranged at intervals form a second-stage rubber cylinder group which is positioned between the rubber cylinder base II 110 and the cone 19 and is separated by two anti-bulge rings II 150; the slips 20 are sleeved on the central pipe 18 and positioned between the cone 19 and the slip table 21 and are fixedly connected to the slip table 21; the slip table 21 is connected with the central pipe 18 through threads; the lower joint 22 is connected with the lower end of the central tube 18 through threads.

The slips 20 are single-cone multi-disc slips, the number of the slips 20 is 4-8, the slip teeth are in a sawtooth shape, 5-20 slip teeth are arranged on each slip 20, the tooth height h is 2-4 mm, the tooth width a is 8-12 mm, the tooth top width b is 1-2 mm, the tooth root width c is 1-2 mm, the tooth inclination angle alpha is 25-30 degrees, and the tooth top angle beta is 90-100 degrees.

The friction angle phi between the cone 19 and the slip 20 is 20-25 degrees, the slip cone angle gamma is 13-15 degrees, a self-locking relation is formed, and the cone 20 and the central tube 18 are in interference fit with the outer side.

After the loading pin I24 is cut off, the shell joint 4 drives the shell I2 and the shell II 5 to move downwards, the shell II 5 presses the shell III 6 to move downwards, the shell III 6 presses the locker I9 to slide downwards, the locker I9 pushes the rubber cylinder base 11 to move downwards, the rubber cylinder base 11 presses the first-stage rubber cylinder group, the locker II 16 and the second-stage rubber cylinder group to move downwards axially, the cone 19 further moves downwards, the cone 19 extrudes the slip 20, the slip 20 is gradually expanded under pressure, the two-stage rubber cylinder group is expanded under pressure to realize sealing, the sawtooth-shaped threads on the inner wall of the locker I9 are matched with the sawtooth-shaped threads on the outer surface of the locking base 10, and the sawtooth-shaped threads on the inner wall of the locker II 16 are matched with the sawtooth-shaped threads on the outer surface of the snap ring 17, so that the locking action is completed, and the seat sealing is realized.

After the loading pin II 23 is cut off, the setting short section 8 moves downwards, the pipe column is lifted, the setting clamping claw 7 moves upwards, the setting short section 8 is driven to gradually set the locking seat 10, and setting is completed.

And lifting the pipe column, moving the locking seat 10 upwards, driving the central pipe 18 to move by the locking seat 10, and separating the locking seat 10 from the zigzag threads of the locking device I9 matched with the locking seat and the zigzag threads matched with the clamping ring 17 and the locking device II 16 to realize step-by-step deblocking and finish deblocking.

The working principle is as follows: when the packer is in work, a steel ball is put in to block an internal flow passage of the packer, working liquid is injected into an oil pipe, the packer is pressurized until a loading pin I24 is cut off, a shell joint 4 drives a shell I2 and a shell II 5 to move downwards, the shell II 5 pushes a shell III 6 to move downwards, the shell III 6 pushes a locker I9 to slide downwards, the locker I9 pushes a rubber cylinder seat 11 to move downwards, the rubber cylinder seat 11 pushes a two-stage rubber cylinder group, the locker II 16 and a cone 19 to move downwards along the axial direction, and the cone 19 extrudes a slip 20 to enable the slip to be used

20 gradually expands and clings to the inner wall surface of the sleeve, the two-stage rubber cylinder group expands under pressure to realize sealing, the sawtooth thread on the inner wall of the locker I9 is matched with the sawtooth thread on the outer surface of the locking seat 10, and the sawtooth thread on the inner wall of the locker II 16

The locking action is completed by matching with the sawtooth-shaped thread on the outer surface of the snap ring 17, and the setting is completed; on the basis of completion of setting, after the load-fixing pin II 23 is cut off, the setting short section 8 moves downwards, the pipe column is lifted upwards, the setting restraining claw 9 moves upwards along the axial direction, the setting short section 8 is driven to gradually set the locking seat 10, and setting is completed; the fishing tool is placed in the inner hole of the packer locking seat 10, the pipe column is lifted, the locking seat 10 moves upwards, the locking seat 10 drives the central pipe 18, the locking seat 10 is separated from the sawtooth-shaped threads of the locking device I9 matched with the locking seat and the sawtooth-shaped threads of the clamping ring 17 and the locking device II 16 matched with the locking seat, the mechanism is unsealed step by step, at the moment, the double-stage rubber barrel group rebounds, the slips 20 are withdrawn smoothly, and the unsealing is completed.

Claims

1. A combined rubber sleeve type two-stage ultrahigh pressure sealing packer mainly comprises an inner tube (3), a shell joint (4), a setting bundling claw (7), a locker I (9), a locking seat (10), an end rubber sleeve I (12), a spacer ring I (13), a middle rubber sleeve I (14), a locker II (16), a snap ring (17), a central tube (18), a cone (19), a slip (20) and a lower joint (22), and is characterized in that the upper end of the inner tube (3) is connected with the upper joint (1) through threads, the lower end of the inner tube is connected with the setting bundling claw (7) through threads, and the outer side of the inner tube is provided with two O-shaped sealing rings A (26); the upper end of the shell joint (4) is connected with the shell I through threads, the lower end of the shell joint is connected with the shell II (5) through threads, and two O-shaped sealing rings B (25) are arranged on the inner side of the shell joint; the upper end of the shell III (6) is in interference fit with the sitting and placing clamping claw (7) on the outer side and is fixed by a fixed-load pin I (24); the sitting and placing clamping claw (7) is sleeved outside the sitting and placing short section (8) and is fixed by a load-fixing pin II (23); the upper end of the locker I (9) is in interference fit with the outer side of the shell III (6) and is positioned between the shell III (6) and the first rubber cylinder seat (11); the upper end of the locking seat (10) is arranged outside the sitting and placing clamping claw (7), and the lower end of the locking seat is connected with the central pipe (18) through threads; the middle rubber cylinder I (14), the two end rubber cylinders I (12) and the two fixed spacer rings I (13) arranged at intervals form a first-stage rubber cylinder group, are positioned between the two rubber cylinder seats I (11), and are separated by the two anti-bulge rings I (15); the snap ring (17) is positioned between the locker II (16) and the central tube (18) and is adjacent to the rubber cylinder seat II (110); a second-stage rubber cylinder group is formed by the middle rubber cylinder II (140), the two end rubber cylinders II (120) and the two fixed spacer rings II (130) which are arranged at intervals, is positioned between the rubber cylinder seat II (110) and the cone (19), and is separated by the two anti-bulge rings II (150); the slips (20) are sleeved on the central pipe (18), are positioned between the cone (19) and the slip table (21), and are fixedly connected to the slip table (21); the slip table (21) is connected with the central pipe (18) through threads; the lower joint (22) is connected with the lower end of the central tube (18) through threads.

2. The combined rubber-barrel two-stage ultrahigh pressure sealing packer of claim 1, characterized in that: the slip (20) is a single-cone multi-petal slip, the number of the slips (20) petals is 4-8, the slip teeth are in a sawtooth shape, 5-20 slip teeth are arranged on each slip (20), the tooth height h is 2-4 mm, the tooth width a is 8-12 mm, the tooth crest width b is 1-2 mm, the tooth root width c is 1-2 mm, the tooth inclination angle alpha is 25-30 degrees, and the tooth crest angle beta is 90-100 degrees.

3. The combined rubber-drum two-stage ultrahigh pressure sealing packer of claim 1, wherein: the friction angle phi between the cone (19) and the slip (20) is 20-25 degrees, the slip cone angle gamma is 13-15 degrees, a self-locking relation is formed, and the cone (19) and the central pipe (18) are in interference fit with the outer side.

4. The combined rubber-drum two-stage ultrahigh pressure sealing packer of claim 1, wherein: rubber barrel seat (11) promote first order rubber barrel group and locker II (16) and the downward axial displacement of second level rubber barrel group, cone (19) pressurized moves down, cone (19) extrusion slips (20), make slips (20) pressurized gradually expand, the two-stage rubber barrel group receives pressure inflation, it is sealed to realize, the zigzag thread of locker I (9) inner wall cooperatees with the zigzag thread of locking seat (10) surface, and the zigzag thread of locker II (16) inner wall cooperatees with the zigzag thread of snap ring (17) surface, accomplish the locking action, realize the setting.

5. The combined rubber-drum two-stage ultrahigh pressure sealing packer of claim 1, wherein: after the load-fixing pin II (23) is cut off, the setting short section (8) moves downwards, the pipe column is lifted, the setting clamping claw (7) moves upwards, the setting short section (8) is driven to set the locking seat (10) step by step, and the setting process is completed.

6. The combined rubber-drum two-stage ultrahigh pressure sealing packer of claim 5, wherein: and lifting the pipe column, moving the locking seat (10) upwards, driving the central pipe (18) to move by the locking seat (10), separating the locking seat (10) from the sawtooth-shaped threads of the locking device I (9) matched with the locking seat, and separating the locking device II (16) from the sawtooth-shaped threads matched with the clamping ring (17), so as to realize step-by-step deblocking and complete deblocking.