CN110905439A

CN110905439A - Integrated downhole operation tool based on bidirectional slip hydraulic permanent packer

Info

Publication number: CN110905439A
Application number: CN201911194831.6A
Authority: CN
Inventors: 潘登; 贾海; 谢胜; 陈华良; 黄船; 蔡佳成; 黄靖富; 周继东; 许峰; 张洋
Original assignee: China National Petroleum Corp
Current assignee: China National Petroleum Corp; CNPC Chuanqing Drilling Engineering Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-03-24
Anticipated expiration: 2039-11-28
Also published as: CN110905439B

Abstract

The invention provides an integrated downhole operation tool based on a bidirectional slip hydraulic permanent packer. The work tool includes: the device comprises a test valve, a pressure gauge support cylinder, a liquid replacement valve, a plugging valve and a bidirectional slip hydraulic permanent packer. Wherein, the packer includes: the upper core shaft, the lower core shaft, the upper hydraulic outer barrel, the lower hydraulic outer barrel, the first shearing fixing part, the second shearing fixing part and the third shearing fixing part are sequentially sleeved on the upper core shaft from top to bottom, and an upper slip, an upper cone, a rubber barrel, a lower cone, a lower slip, a locking ring assembly and a double male short section are sequentially sleeved on the upper core shaft from top to bottom. The upper end of the test valve can be connected with the upper stream of the integrated downhole operation tool, the lower end of the test valve is connected with the upper end of the pressure gauge, the lower end of the pressure gauge is connected with the upper end of the liquid replacing valve, the lower end of the liquid replacing valve is connected with the upper end of the plugging valve, and the lower end of the plugging valve is connected with the bidirectional slip hydraulic permanent packer. The invention has the functions of oil testing and well completion commissioning at the same time.

Description

Integrated downhole operation tool based on bidirectional slip hydraulic permanent packer

Technical Field

The invention relates to the technical field of oil well testing and well completion equipment, in particular to an integrated downhole operation tool based on a bidirectional slip hydraulic permanent packer.

Background

At present, most of oil testing and well completion operations of exploratory wells or evaluation wells need to be completed in two steps. The first step is that a test pipe column with a series of tools such as a test packer, a test valve, an electronic pressure gauge and the like is put near a production layer, then open flow production solving test is carried out, and well killing, pipe column lifting and temporary plugging are carried out after the test is finished, wherein the step mainly aims at obtaining formation information; if the production is available, the well completion is required to be put into operation, the second step is carried out, the shaft preparation (including drilling plug, wall scraping, well dredging and the like) is carried out again, and then a well completion pipe string with a well completion packer, a downhole safety valve and other series tools is put into operation. The two-step walking mode has certain limitations, and mainly shows that:

the process is multiple, the operation time is long, and the production cannot be put into operation in time. The oil testing test generally comprises more than ten steps of drifting, scraping walls, lowering a test pipe column, perforating, reservoir transformation, blowout and liquid drainage, production test, well killing, starting up the test pipe column and the like, the well completion operation comprises nearly ten steps of secondary shaft preparation, well completion pipe column lowering, liquid replacement, setting, blowout and the like, part of wells even need to be secondarily acidized to restore productivity, and a large amount of time can be consumed.

Repeated killing can cause pollution to the oil and gas producing formation, serious even permanent damage can be caused, and the oil and gas producing formation can not recover due productivity. Meanwhile, multiple killing easily causes the problems of pipe column blocking and burying and the like, increases the engineering difficulty, and even causes shaft scrapping if careless treatment is carried out, thus causing great waste of resources. The oil testing test pipe column is provided with testing tools such as a packer, a testing valve and the like, the space in a channel is limited, and plugging materials and the like are easy to accumulate at the tool to clamp and bury the pipe column in the well killing process, so that the test pipe column is difficult to pull out.

Disclosure of Invention

The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, it is an object of the present invention to provide an integrated downhole tool that saves process steps, shortens the operation time, and achieves rapid production.

In order to achieve the above object, the present invention provides an integrated downhole tool based on a bidirectional slip hydraulic permanent packer. The integrated downhole tool includes a bi-directional slip hydraulic permanent packer, wherein the packer includes:

the upper core shaft, the lower core shaft, the upper hydraulic outer barrel, the lower hydraulic outer barrel, the first shearing fixing part, the second shearing fixing part and the third shearing fixing part are sequentially sleeved on the upper core shaft from top to bottom, and the annular piston is sleeved on the lower core shaft.

The lower end of the upper mandrel is connected with the upper end of the lower mandrel, and the lower end of the lower mandrel is connected with the lower hydraulic outer cylinder;

the upper end of the upper slip is fixedly connected with the upper mandrel, the lower end of the upper slip is sleeved on the conical surface of the upper cone, and the upper slip can move downwards relative to the upper cone and is in a spreading state;

the lower end of the upper cone is connected with the upper mandrel through a first shearing fixing piece, and the distance from the conical surface of the upper cone to the axis of the upper mandrel is gradually increased from top to bottom;

the rubber cylinder is arranged between the upper cone and the lower cone, the upper end of the rubber cylinder is contacted with the upper cone, and the lower end of the rubber cylinder is contacted with the lower cone;

the upper end of the lower cone is connected with the upper mandrel through a second shearing fixing piece, and the distance from the conical surface of the lower cone to the axis of the upper mandrel is gradually reduced from top to bottom;

the upper end of the lower slip is sleeved on the conical surface of the lower vertebral body, and the lower slip can move upwards relative to the lower vertebral body and is in an opening state;

the locking ring assembly comprises a locking ring sleeve, an inner locking ring, a backstop piece and an elastic piece, wherein the locking ring sleeve is fixedly connected with the lower end of the lower slip, a first cavity with a one-way opening is formed between the locking ring sleeve and the lower mandrel, the opening direction is downward, the inner locking ring is arranged in the first cavity and can be abutted against the inner wall of the locking ring sleeve, the inner locking ring can perform one-way sliding along the outer wall of the lower mandrel, the sliding direction is upward, the backstop piece is positioned in the first cavity, the upper end of the backstop piece is contacted with the inner locking ring, the elastic piece is positioned in the first cavity, the upper end of the elastic piece is connected with the lower end face of the backstop piece, and the lower end of the elastic;

the upper end of the double male short section also comprises a protruding section which can be contacted with the lower end surface of the lock ring sleeve and close the opening of the first cavity, and the lower end of the double male short section is pressed against the upper end of the upper hydraulic cylinder;

the upper hydraulic outer cylinder is sleeved on the lower section of the upper mandrel and the upper section of the lower mandrel, a second cavity with a one-way opening can be formed between the upper hydraulic outer cylinder and the upper mandrel, the opening direction is downward, and the upper end of the lower mandrel is inserted into the second cavity and seals the opening; a third cavity with a one-way opening can be formed between the upper hydraulic outer cylinder and the lower mandrel, the opening direction faces downwards, and a pore channel for communicating the third cavity with the outside is formed in the upper hydraulic outer cylinder;

the upper section of the lower hydraulic outer cylinder is sleeved on the lower section of the lower mandrel, a fourth cavity with a one-way opening can be formed between the upper end of the lower hydraulic outer cylinder and the lower mandrel, the opening direction is upward, and the opening of the third cavity and the opening of the fourth cavity face each other;

the annular piston comprises a first section, a protruding section and a second section which are sequentially connected from top to bottom, wherein the first section and the second section can be respectively inserted into the third cavity and the fourth cavity, the protruding section protrudes outwards relative to the first section and the second section, the protruding section is respectively contacted with the lower end face of the upper hydraulic outer cylinder and the upper end face of the lower hydraulic outer cylinder, and the second section is connected with the lower hydraulic outer cylinder through a third shearing fixing piece;

the upper core shaft is also provided with a first inner pressure transmission hole for communicating the second cavity with the cavity of the upper core shaft;

and a second inner pressure transmission hole for communicating the fourth cavity with the cavity of the lower mandrel is also formed in the lower mandrel.

In an exemplary embodiment of the invention, the outer wall of the upper mandrel is provided with one-way teeth for sliding of an inner locking ring, and the inner locking ring can slide upwards along the one-way teeth on the outer wall of the upper mandrel.

In an exemplary embodiment of the invention, the packer may further comprise a torsion key configured to fixedly couple an upper end of the upper slip to the upper mandrel.

In an exemplary embodiment of the invention, the lower mandrel comprises a first section of the lower mandrel, a second section of the lower mandrel and a third section of the lower mandrel in a top-down order, wherein the thickness of the second section of the lower mandrel is greater than the thickness of the first section of the lower mandrel and the thickness of the third section of the lower mandrel; the distance from the inner wall of one section of the lower mandrel to the axis is greater than the distance from the inner wall of the three sections of the lower mandrel to the axis, and the upper end of the lower mandrel is formed by one section of the lower mandrel.

In an exemplary embodiment of the present invention, the glue cylinder may include a first elastic member, a second elastic member, an upper glue cylinder, a middle glue cylinder and a lower glue cylinder, which are sequentially connected from top to bottom and have the same inner and outer diameters, wherein an upper end surface of the upper glue cylinder is a first annular plane, and a lower end surface of the upper glue cylinder is an inwardly concave first annular curved surface;

the upper end surface of the middle rubber cylinder is a second annular curved surface which protrudes outwards and is matched with the first annular surface, and the lower end surface of the middle rubber cylinder is a third annular curved surface which protrudes outwards; the upper end surface of the lower rubber cylinder is an inward-concave fourth annular curved surface matched with the third annular curved surface, and the lower end of the lower rubber cylinder is a second annular plane; the first elastic component is arranged in the upper end of the upper rubber cylinder along the circumferential direction of the first annular plane, so that the upper end of the upper rubber cylinder can bear radial shearing force; the second elastic component is arranged in the lower end of the lower rubber cylinder along the circumferential direction of the second annular plane, so that the lower end of the lower rubber cylinder can bear radial shearing force.

In an exemplary embodiment of the present invention, the rubber material of the rubber cylinder may be prepared from the following raw materials in parts by mass:

36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of argil, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of N, N' -m-phenylene bismaleimide.

In one exemplary embodiment of the present invention, the plasticizer may include at least one of a DOS plasticizer, a DOP plasticizer, a TP-95 plasticizer, and a TOTM plasticizer.

In an exemplary embodiment of the invention, the antioxidant may comprise at least one of RD antioxidant, 445 antioxidant, ZMTI antioxidant, and MB antioxidant.

In an exemplary embodiment of the invention, the integrated downhole tool may further comprise an anchoring seal assembly, the anchoring seal assembly comprising a spline mandrel, a guide joint, and an open fluke and a first seal member arranged on the spline mandrel from top to bottom, wherein a lower end of the spline mandrel may be fixedly connected with an upper end of the guide joint, and a lower end of the guide joint may be inserted into the inner cavity of the upper mandrel.

In an exemplary embodiment of the invention, the anchoring seal assembly further comprises a backstop ring and a backstop short section, wherein the backstop short section is sleeved on the spline mandrel from top to bottom, and is arranged at the upper part of the opening fluke.

In an exemplary embodiment of the invention, the inner wall of the top part of the upper mandrel is provided with an internal thread adapted to the open fluke.

In an exemplary embodiment of the invention, the integrated downhole working tool may further comprise a milling extension cylinder, the milling extension cylinder being a hollow cylinder body, an upper end of which is connectable with a lower end of the lower mandrel, and a lower end of which is connectable with a tubing.

In an exemplary embodiment of the invention, the integrated working tool further comprises a setting ball seat, the setting ball seat comprises a shearing outer cylinder, a ball seat core and a fourth shearing fixing piece, wherein the ball seat core is of a hollow structure and comprises an upper opening and a lower opening, and the ball seat core is arranged in an inner cavity of the shearing outer cylinder and is connected with the inner wall of the shearing outer cylinder through the fourth shearing fixing piece.

In an exemplary embodiment of the invention, the setting ball seat further comprises a second seal to effect a seal between the ball seat core and the inner wall of the shear outer barrel.

In an exemplary embodiment of the invention, the setting ball seat may further comprise a setting ball which can be dropped from the wellhead onto the ball seat core to seal off the tubing drift.

In an exemplary embodiment of the invention, the integrated downhole tool may further comprise a test valve, a pressure gauge support cylinder, a replacement fluid valve and a plugging valve connected in sequence from top to bottom and finally connected to the bidirectional slip hydraulic permanent packer.

In an exemplary embodiment of the present invention, the integrated downhole tool may further comprise an expansion joint capable of expanding and contracting the integrated downhole tool in the casing in an up-down direction.

In an exemplary embodiment of the invention, the integrated downhole tool further comprises a screen connected to the setting seat.

In an exemplary embodiment of the invention, the integrated downhole tool may further comprise a perforating gun coupled to the screen, the perforating gun capable of perforating the reservoir for a formation modification.

In an exemplary embodiment of the invention, the integrated downhole tool may further comprise: the device comprises a telescopic joint, a normally closed valve, an RDS circulating valve, a pressure gauge support cylinder, an RTTS safety joint, a temporary plugging ball seat and a setting ball seat.

Compared with the prior art, the beneficial effects of the invention can include:

the integrated downhole operation tool has the functions of testing oil and performing well completion production simultaneously, saves operation procedures, is high in testing oil-transferring efficiency, reduces engineering complexity, protects an oil-gas reservoir, can realize bidirectional sealing, and reduces well control risks.

Drawings

FIG. 1 shows a schematic overall configuration of an exemplary embodiment of an integrated downhole tool based on a bi-directional slip hydraulic permanent packer according to the present invention;

FIG. 2 illustrates a schematic diagram of an anchoring seal assembly of an exemplary embodiment of a bi-directional slip hydraulic permanent packer based integrated downhole tool in accordance with the present invention;

FIG. 3 illustrates a schematic diagram of a packer body of an exemplary embodiment of an integrated downhole tool based on a bi-directional slip hydraulic permanent packer in accordance with the present invention;

FIG. 4 illustrates a schematic diagram of a milling extension cartridge of an exemplary embodiment of a bi-directional slip hydraulic permanent packer based integrated downhole tool in accordance with the present invention;

FIG. 5 illustrates a schematic structural view of a setting ball seat of an exemplary embodiment of a bi-directional slip hydraulic permanent packer based integrated downhole tool according to the present invention.

Description of the main reference numerals:

a-expansion joint, B-test valve, C-pressure gauge supporting cylinder, D-liquid replacing valve, E-plugging valve, F-bidirectional slip hydraulic permanent packer, G-sieve tube, H-perforating gun, 1-anchoring sealing assembly, 2-packer main body, 3-milling extension cylinder, 4-setting ball seat, 5-spline mandrel, 6-check ring, 7-check short section, 8-opening anchor claw, 9-sealing ring, 10-guiding joint, 11-upper mandrel, 12-torsion key, 13-upper slip, 14-upper cone, 15-first shear pin, 16-rubber cylinder, 17-lower cone, 18-second shear pin, 19-lower slip, 20-lock ring sleeve, 21-inner lock ring, 22-check piece, 23-elastic piece, 24-double male short section, 25-upper hydraulic outer cylinder, 26-lower mandrel, 27-annular piston, 28-third shear pin, 29-lower hydraulic outer cylinder, 30-shear outer cylinder, 31-setting ball, 32-ball seat core and 33-fourth shear pin.

Detailed Description

Hereinafter, the integrated downhole tool based on the bidirectional slip hydraulic permanent packer of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments. It should be noted that "first", "second", "third", "fourth", etc. are merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "inner," and "outer" are merely used for convenience of description and to constitute relative orientations or positional relationships, and do not indicate or imply that the referenced components must have that particular orientation or position.

FIG. 1 shows an overall schematic of an exemplary embodiment of an integrated downhole tool based on a bi-directional slip hydraulic permanent packer according to the present invention. FIG. 2 illustrates a schematic diagram of an anchoring seal assembly of an exemplary embodiment of a bi-directional slip hydraulic permanent packer based integrated downhole tool in accordance with the present invention. FIG. 3 shows a schematic diagram of a packer body of an exemplary embodiment of an integrated downhole tool based on a bi-directional slip hydraulic permanent packer according to the present invention. FIG. 4 shows a schematic diagram of a milling extension cartridge of an exemplary embodiment of a bi-directional slip hydraulic permanent packer based integrated downhole tool according to the present invention. FIG. 5 illustrates a schematic structural view of a setting ball seat of an exemplary embodiment of a bi-directional slip hydraulic permanent packer based integrated downhole tool according to the present invention.

In an exemplary embodiment of the invention, the integrated downhole tool based on a bidirectional slip hydraulic permanent packer may comprise a bidirectional slip hydraulic permanent packer. As shown in fig. 2-5, the bidirectional slip hydraulic permanent packer comprises an anchoring seal assembly 1, a packer body 2, a milling extension drum 3 and a setting ball seat 4. The upper end of the anchoring seal assembly 1 is fixedly connected with the lower end of the plugging valve, the lower end of the anchoring seal assembly 1 is fixedly connected with the upper end of the packer main body 2, and the lower end of the packer main body 2 is fixedly connected with the upper end of the milling extension cylinder 3; the lower end of the milling extension cylinder 3 is connected with the upper end of the setting ball seat 4 through a section of oil pipe. Here, it is usually necessary to set the ball seat 4 down to the top of the production zone and the packer setting is located some distance from the top of the production zone, so that tubing is used to extend the distance from the lower end of the mill extension barrel 3 to the upper end of the setting ball seat 4 to bring the setting ball seat 4 down to the top of the production zone.

In the present embodiment, as shown in fig. 2, the anchor seal assembly 1 may include: the device comprises a spline mandrel 5, a guide joint 10, a retaining ring 6, a retaining short section 7, an opening fluke 8 and a first sealing element 9, wherein the retaining ring, the retaining short section 7, the opening fluke 8 and the first sealing element are sleeved on the spline mandrel 5 from top to bottom. Here, top-down refers to the axial direction from the upper end of the spline mandrel (or the end closer to the upstream of the integrated downhole tool) to the lower end of the pilot sub (or the end closer to the downstream of the integrated downhole tool).

Spline dabber 5 is the quasi-circular cylinder, and the upper end of spline dabber 5 can be with shutoff valve E lower extreme fixed connection. Here, the spline dabber can be directly connected with the shutoff valve, also can be through the succinct connection of a section oil pipe, and the connected mode can be threaded connection. The spline mandrel 5 is provided with a groove for sleeving the retaining ring 6 and a shape matched with the inner part of the retaining short section 7. The opening fluke 8 is circular sleeve pipe, and opening fluke 8 is close to and is equipped with the screw thread on the lower extreme outer wall, still is equipped with along axial direction from the top down gap on the opening fluke 8, is equipped with on the spline dabber 5 with opening fluke 8 on the gap complex protruding structure. Opening fluke 8 suit is on spline dabber 5 and makes protruding structure get into the gap in, and 7 lower extremes of stopping nipple joint and 8 upper ends contacts of opening fluke, thereby 7 upper ends of stopping nipple joint and 6 contacts of stopping ring 6 that are located the recess are thereby fixed opening fluke 8 and spline dabber 5. Here, the open fluke may be a left handed open fluke. The spline mandrel 5 is further provided with a sealing groove for the first sealing element to act, wherein the first sealing element can be circular rubber, and the number of the first sealing elements can be three. The lower end of the spline mandrel 5 is fixedly connected with the upper end of the guide joint 10, and the connection mode can be a threaded connection. However, the present invention is not limited thereto as long as the fixed connection of the spline spindle and the pilot joint can be achieved. The anchoring seal assembly 1 can be inserted into an inner cavity of an upper core shaft 11 of the packer main body 2, so that an opening anchor claw 8 on the spline shaft center 5 is meshed and fixed with threads of the inner cavity of the upper core shaft 11, and a first sealing element on the spline shaft center 5 is tightly attached to the inner wall of the upper core shaft 11 to play a sealing role.

In the present embodiment, as shown in fig. 3, the packer body 2 may include: the hydraulic double-core pipe comprises an upper mandrel 11, a lower mandrel 26, an upper hydraulic outer cylinder 25, a lower hydraulic outer cylinder 29, a first shear pin 15, a second shear pin 18, a third shear pin 28, an upper slip 13, an upper cone 14, a rubber cylinder 16, a lower cone 17, a lower slip 19, a locking ring assembly, a double male short section 24 and an annular piston 27, wherein the upper slip 13, the upper cone 14, the rubber cylinder 16, the lower cone 17, the lower slip 19, the locking ring assembly and the double male short section 24 are sequentially sleeved on the upper mandrel 11 from top to bottom. Here, top-down refers to the axial direction from the upper end of the upper mandrel 11 (or the end closer to the upstream of the integrated downhole tool) to the lower mandrel 26 (or the end closer to the downstream of the integrated downhole tool).

The upper end of the upper mandrel 11 is provided with a thread which is matched with the open fluke 8 on the anchoring and sealing assembly 1. For example, the threads may be left-handed buttress threads. The lower end of the upper mandrel 11 is fixedly connected with the upper end of the lower mandrel 26. For example, the upper spindle and the lower spindle may be connected by a screw thread, however, the present invention is not limited thereto as long as the upper spindle and the lower spindle can be connected. Here, the upper mandrel 11 further comprises a sealing outer cylinder, and the sealing outer cylinder is arranged outside the upper mandrel to perform a sealing function. The lower end of the lower mandrel 26 is connected to the lower hydraulic cylinder 29, for example, the lower mandrel and the lower hydraulic cylinder may be connected by a screw thread.

The outer wall of the upper slip 13 is provided with a sawtooth-like structure, and the inner wall of the upper slip 13 close to the lower end is provided with a structure matched with the conical surface of the upper cone 14. The upper end of the upper slip 13 is fixedly connected with the upper mandrel 11 through a torsion key 12, and the lower end is sleeved on the conical surface of the upper cone 14. The upper slip 13 can slide downwards relative to the conical surface of the upper cone 14 so as to be expanded, so that the sawtooth-like structure on the outer wall of the upper slip 13 is engaged with the inner wall of the casing to fix the position of the upper slip 13 in the casing.

The upper cone 14 is a cone-shaped structure, and the distance from the cone surface of the upper cone 14 to the axis of the upper mandrel 11 is gradually increased from top to bottom. For example, the angle between the conical surface of the upper cone and the axial direction may be 20 to 40 °. The upper cone 14 has a plurality of first openings, and the upper mandrel 11 has first concave holes corresponding to the first openings, the number of the first concave holes being the same as that of the first openings. The first shear fastener may include a number of first shear pins 15, the number of first shear pins 15 being the same as the number of first apertures, each first shear pin 15 being insertable into a corresponding relationship of a first aperture and a first recess to fixedly connect the superior vertebral body 14 to the superior mandrel 11. Here, the number of the first openings may be determined according to practical circumstances, for example, 1, 3, 5, or 8. The first shear fixation member may comprise several shear pins, however the invention is not limited thereto as long as a fixation of the superior vertebral body to the superior core shaft is achieved and the fixation member may be sheared off by an external force.

The outer wall of the lower slip 19 is provided with a sawtooth-like structure, the upper end of the inner wall of the lower slip 19 is provided with a structure matched with the conical surface of the lower cone 17, the lower end of the lower slip 19 is fixedly connected with the upper hydraulic outer cylinder 25, the upper end of the lower slip is sleeved on the conical surface of the lower cone 17, the lower slip 19 can slide upwards relative to the conical surface of the lower cone 17 so as to be spread, and the sawtooth-like structure on the convex surface of the lower slip 19 is meshed with the inner wall of the casing pipe to fix the position of the lower slip 19 in.

The lower cone 17 is a cone-shaped structure, and the distance from the cone surface of the lower cone 17 to the axis of the upper mandrel is gradually reduced from top to bottom. For example, the angle between the conical surface of the lower cone and the axial direction may be 20 to 40 °. The lower cone 17 has a plurality of second openings, and the upper mandrel 11 has second recesses corresponding to the second openings, the number of the second recesses being the same as that of the second openings. The second shear fastener may include a plurality of second shear pins 18, the number of second shear pins 18 being the same as the number of second openings, each second shear pin 18 being insertable into a corresponding second opening and second recess to fixedly connect the inferior vertebral body 17 to the superior mandrel 11. Here, the number of the second openings may be determined according to actual conditions, for example, 1, 3, 5, or 8. The second shear fixation member may comprise several shear pins, however, the present invention is not limited thereto, as long as the fixation of the lower vertebral body to the upper mandrel is achieved and the fixation member can be sheared off by external force.

The rubber tube 16 is sleeved on the upper mandrel 11 and positioned between the upper cone 14 and the lower cone 17, the upper end of the rubber tube 16 is contacted with the lower end of the upper cone 14, the lower end of the rubber tube 16 is contacted with the upper end of the lower cone 17, the rubber tube 16 can deform under the extrusion of the lower end of the upper cone 14 and the upper end of the lower cone 17, and the packer is in sealing connection with the inner wall of the casing pipe

In this embodiment, the locking ring assembly includes a locking ring collar 20, an inner locking ring 21, a backstop member 22, and a resilient member 23. Wherein, the locking ring sleeve 20 is fixedly connected with the lower end of the lower slip 19, and a first cavity with a one-way opening is formed between the locking ring sleeve 20 and the lower mandrel 11, and the opening direction is downward. The inner locking ring 21 is of a structure with a conical surface at the upper end, and the distance between the conical surface of the inner locking ring 21 and the upper mandrel 11 gradually increases from top to bottom. The inner locking ring 21 is arranged at the bottom of the first cavity, and the conical surface of the inner locking ring 21 can contact the inner wall of the locking ring sleeve 20 to play a role in locking the position of the locking ring sleeve 20 on the upper core shaft 11. Here, the outer wall of the upper mandrel 11 is provided with one-way teeth for the inner locking ring 21 to slide upwards, the inner wall of the inner locking ring 21 is provided with anti-one-way teeth meshed with the one-way teeth on the outer wall of the upper mandrel 11, and the inner locking ring 21 can slide upwards along the one-way teeth on the outer wall of the upper mandrel 11 under the action of thrust. For example, the cross section of the one-way tooth in the up-down direction may be a right triangle whose hypotenuse gradually increases in distance from the upper spindle in the down-up direction. However, the present invention is not limited thereto, and the one-way teeth may have other structures as long as the inner lock ring can be made to slide in one direction in the upper core shaft direction. The backstop 22 and the elastic component 23 are arranged in the first cavity, the upper end of the backstop 22 is in contact with the lower end of the inner locking ring 21, the lower end of the backstop 22 is in contact with the upper end of the elastic component 23, and the lower end of the elastic component 23 is in contact with the upper end of the double male short section 24 to transmit thrust applied by the double male short section. For example, the retaining member may be a retaining ring and the elastic member may be a spring, but the present invention is not limited thereto, and the retaining member and the elastic member may have other structures as long as the functions of providing elastic force and being compressible are achieved.

The upper end of the double male short section 24 is buckled with the lower end of the lock ring sleeve 21 in an abutting mode, and the opening of the first cavity is closed by the double male short section 24. For example, the upper end of the double male nipple has a structure that mates with the lower end of the locking collar, both of which can form a fit. The lower end of the double male short section 24 and the upper end of the upper hydraulic outer cylinder 25 belong to a splicing relation, and the lower end of the double male short section 24 is inserted into the upper end of the upper hydraulic outer cylinder 25 and fixed together through a fastener.

The upper hydraulic outer cylinder 25 is sleeved on the lower section of the upper mandrel 11 and the upper section of the lower mandrel 26, a second cavity with a one-way opening can be formed between the inner wall of the upper hydraulic outer cylinder 25 and the outer wall of the upper mandrel 11, the opening direction faces downwards, and the upper end of the lower mandrel 26 is inserted into the second cavity and closes the opening. Here, a seal is provided between the upper hydraulic cylinder 25 and the upper mandrel 11, and between the upper hydraulic cylinder 25 and the upper section of the lower mandrel 26. The first inner pressure transfer hole on the upper mandrel 11 is communicated with the second cavity, and can transfer the pressure in the oil pipe to the upper hydraulic outer cylinder 25, so that the upper hydraulic outer cylinder 25 is pushed to move upwards along the upper mandrel 11. A third cavity with a one-way opening can be formed between the upper hydraulic outer cylinder 25 and the lower mandrel 26, the opening direction is downward, and a pore passage for communicating the third cavity with the inner space of the sleeve is arranged on the upper hydraulic outer cylinder 25 and can transmit the pressure in the sleeve.

The upper section of the lower hydraulic outer cylinder 29 is sleeved outside the lower section of the lower mandrel 26, and the lower hydraulic outer cylinder 29 is fixedly connected with the lower end of the lower mandrel 26. For example, the lower hydraulic outer cylinder and the lower mandrel can be connected by a screw thread. A fourth cavity with a one-way opening can be formed between the upper end of the lower hydraulic outer cylinder 29 and the lower mandrel 11, and the opening direction is upward. And a second inner pressure transmission hole on the lower mandrel 11 is communicated with the fourth cavity and can transmit the pressure in the oil pipe.

The annular piston 27 comprises a first section, a protruding section and a second section which are sequentially connected from top to bottom, wherein the first section and the second section can be respectively inserted into the third cavity and the fourth cavity to seal the openings of the third cavity and the fourth cavity. The projecting sections of the annular piston project outwardly relative to the first and second sections and are in contact with the lower end surface of the upper hydraulic cylinder 25 and the upper end surface of the lower hydraulic cylinder 29, respectively. Here, a seal is provided between the third section and the lower hydraulic outer cylinder 29 and between the third section and the lower mandrel 26. The lower hydraulic outer cylinder 29 is provided with a plurality of third openings, and the second section of the annular piston 27 is provided with third concave holes which have the same number as the third openings and correspond to the third openings. The third shear fixing member may comprise a plurality of third shear pins 28, the number of the third shear pins 28 being the same as the number of the third openings, each third shear pin 28 being capable of being inserted into the corresponding third opening and the third recess to fixedly connect the annular piston 27 with the lower hydraulic cylinder 29. When the internal pressure of the packer is greater than the pressure in the casing, the internal pressure acts in the fourth chamber on the lower end of the annular piston 27 giving it an upward thrust and the external pressure acts in the third chamber giving it a downward thrust on the upper end of the annular piston 27. When the pressure difference between the inside and the outside is large enough to push the annular piston 27 to shear the third shear fixing, the annular piston 27 moves upward and pushes the components connected with it to move upward together. Here, the number of the third openings may be determined according to actual conditions, for example, 1, 3, 5, or 8. The third shear fixing member may comprise a plurality of shear pins, but the present invention is not limited thereto as long as the fixing member can fix the annular piston to the lower hydraulic cylinder and can be sheared by an external force.

In this embodiment, as shown in fig. 4, the milling extension cylinder 3 is a hollow cylinder, an upper end (i.e., a left end in fig. 4) of the milling extension cylinder 3 can be connected to a lower end of the lower mandrel 26, and a lower end (i.e., a right end in fig. 4) of the milling extension cylinder 3 can be indirectly connected to an upper end of the setting ball seat 4 through a section of oil pipe. Here, packer structural design does not possess deblocking mechanism for permanent formula, and after the sealed giving up of anchoring, the saw tooth slips above part just can realize salvaging under need milling, and the setting is milled and is extended a section of thick bamboo and is in order to increase the interval of setting ball seat and sub-unit connection structure and packer main part, avoids the later stage to suffer the damage when milling salvage packer.

In the present embodiment, as shown in fig. 5, the setting ball seat 4 includes a shear outer cylinder 30, a setting ball 31, a ball seat core 32, and a fourth shear fixture.

The shearing outer cylinder 30 is a hollow cylinder, the upper end (i.e. the left end in fig. 5) of the shearing outer cylinder 30 is connected with the lower end of the milling extension cylinder 3 through a section of oil pipe, and the lower end (i.e. the right end in fig. 5) of the shearing outer cylinder 30 is communicated with the underground space. For example, the connection may be a threaded connection. However, the present invention is not limited thereto, and the shearing outer cylinder and the milling extension cylinder may be directly connected. Meanwhile, the outer cutting cylinder 30 has a plurality of fourth openings into which a fourth cutting fixture is inserted.

The ball seat core 32 is a hollow structure and includes an upper opening and a lower opening, wherein the upper opening of the ball seat core can be attached to the surface of the seat ball 31. The ball seat core 32 has the same number of fourth holes as the number of the fourth holes and corresponds to each fourth hole. The ball seat core 32 is disposed inside the shear outer cylinder 30 and is attached to the inner wall of the shear outer cylinder 30. The fourth shear fixing member may include a plurality of fourth shear pins 33, the number of the fourth shear pins 33 is the same as the number of the fourth apertures, and each of the fourth shear pins 33 may be inserted into the fourth apertures and the fourth recesses in a corresponding relationship to fixedly connect the ball seat core 32 and the shear outer cylinder 30. Here, the number of the fourth apertures may be determined according to actual conditions, for example, 1, 3, 5, or 8. The fourth shear fixing member may include several shear pins, but the present invention is not limited thereto as long as the fixing member can fix the ball seat core and the shear outer cylinder and can be sheared by an external force.

The inner cavity of the shearing outer cylinder 30 is also provided with a pit for placing a second sealing element, and the second sealing element enables the inner wall of the shearing outer cylinder 30 to be connected with the outer wall of the ball seat core 32 in a sealing manner.

The setting ball 31 can drop on the ball seat core 32 from the well head, and blocks the drift diameter of the oil pipe by being attached to the upper end structure of the ball seat core 32. For example, the setting ball may be a steel ball, however, the present invention is not limited thereto as long as it can block the drift diameter of the oil pipe.

In this embodiment, the glue cylinder 16 may include a first elastic member, a second elastic member, an upper glue cylinder, a middle glue cylinder, and a lower glue cylinder, which are sequentially connected from top to bottom and have the same inner and outer diameters, wherein an upper end surface of the upper glue cylinder is a first annular plane, and a lower end surface of the upper glue cylinder is an inwardly concave first annular curved surface; the upper end surface of the middle rubber cylinder is a second annular curved surface which protrudes outwards and is matched with the first annular surface, and the lower end surface of the middle rubber cylinder is a third annular curved surface which protrudes outwards; the upper end surface of the lower rubber cylinder is an inward-concave fourth annular curved surface matched with the third annular curved surface, and the lower end of the lower rubber cylinder is a second annular plane; the first elastic component is arranged in the upper end of the upper rubber cylinder along the circumferential direction of the first annular plane, so that the upper end of the upper rubber cylinder can better bear radial shearing force; the second elastic component is arranged in the lower end of the lower rubber cylinder along the circumferential direction of the second annular plane, so that the lower end of the lower rubber cylinder can better bear radial shearing force.

The height ratio of the upper glue cylinder to the middle glue cylinder can be 1: 0.83-1: 1.3, the ratio of the rubber cylinder outer diameter to the rubber cylinder height can be 1: 1-1: 1.5, after the three rubber cylinders are compressed and set in the sleeve, the axial compression ratio is less than 0.25, and according to the principle that the volumes of the rubber cylinders are not changed before and after compression, the compression ratio of the rubber cylinders adhered to the wall of the sleeve after compression deformation can be changed by adjusting the length and thickness values of the rubber cylinders. For example, the thicker the rubber sleeve is, the more easily the rubber sleeve is attached to the sleeve, and when the rubber sleeve is compressed and attached to the wall of the sleeve, only a small axial compression rate is needed; when the rubber cylinder is thin, the rubber cylinder needs to be compressed by a large amplitude in the axial direction, and the compression ratio of the rubber cylinder is large. When the compression ratio is controlled within 0.25, the length and the thickness of the rubber cylinder are inversely designed according to the size of the inner diameter of the sleeve, so that the rubber cylinder can be tightly attached to the inner wall of the sleeve after being compressed better, and the rubber cylinder cannot be bent in the axial direction.

The contained angle of first annular curved surface and last packing element axis is 79 ~ 81 degrees, and the packing element is wrapped up the extrusion by the oblique angle in this angle range, and compression deformation is more balanced, and the packing element is difficult for off-centre, and circumferential seal is better.

The first elastic member may include a first spring, the second elastic member may include a second spring, both the first spring and the second spring may be multi-layer springs, the first spring may surround a ring in the upper glue cartridge, and a radial direction of the ring may be perpendicular to an axial direction of the upper glue cartridge, the second spring may surround a ring in the lower glue cartridge, and a radial direction of the ring may be perpendicular to an axial direction of the lower glue cartridge. Wherein the initial length of the spring can be calculated according to the following formula:

L＝πD+15

wherein, L: lap length, D: diameter of the rubber cylinder, pi: 3.1416, unit in formula: mm.

And (4) cutting the large spring after calculating the initial length, placing the large spring into a product vulcanization mold after splicing the large spring, and comparing the large spring and the large spring, and determining the proper length to be cut according to the actual condition. The inner spring is cut according to the actual length of the outer spring.

In the present embodiment, the rubber material of the rubber cylinder 16 is prepared from the following raw materials in parts by mass: 36-50% of hydrogenated nitrile rubber, 12-33% of spray carbon black, 1-14% of thermal cracking carbon black, 3-14% of nano white carbon black, 3-19% of pottery clay, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.

The rubber materials of the upper rubber cylinder and the lower rubber cylinder can be prepared from the following components in parts by mass: 36-46% of hydrogenated nitrile rubber, 23-33% of spray carbon black, 4-14% of thermal cracking carbon black, 3-13% of nano white carbon black, 3-13% of argil, 1-4% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.

The rubber material of the medium rubber cylinder can be prepared from the following raw materials in percentage by mass: 40-50% of hydrogenated nitrile rubber, 12-22% of spray carbon black, 1-11% of thermal cracking carbon black, 4-14% of nano white carbon black, 9-19% of argil, 1-9% of plasticizer, 0.5-2% of anti-aging agent, 0.5-2% of vulcanizing agent and 1-4% of crosslinking accelerator.

The hydrogenated nitrile rubber can be selected from Arraniaceae HNBR3607, HNBR3907, HNBR4307 and HNBR4367, the hydrogenated nitrile rubber HNBR has excellent oil resistance and solvent resistance and keeps good high and low temperature resistance balance, the mass fraction of acrylonitrile in the hydrogenated nitrile rubber can be 36-44%, the content of residual double bonds is less than 8%, and the crude rubber Mooney viscosity ML1+4(100 ℃) of the hydrogenated nitrile rubber can be 50-100.

When the mass fraction of acrylonitrile in the selected hydrogenated nitrile rubber is 36-44%, the prepared rubber material can have heat resistance, oil resistance and hydrogen sulfide resistance and has good compression set characteristics. The rubber sleeve of the test packer is required to have good recovery after the test is finished, the higher the acrylonitrile content is, the poorer the recovery of the rubber sleeve is, and in order that the rubber sleeve of the test packer prepared from the rubber material has good recovery after the test is finished, the mass fraction of acrylonitrile is not suitable to be high.

When the content of residual double bonds in the selected hydrogenated nitrile rubber is less than 8%, more cross-linked bonds can be generated during vulcanization, the three-dimensional network structure of the rubber can be improved, and the rubber can resist higher pressure in an oil gas well.

When the Mooney viscosity of the raw rubber of the selected hydrogenated nitrile rubber is within the range of 50-100, the rubber material can be ensured to have good processability in the rubber mixing and vulcanizing process.

The spray carbon black, the thermal cracking carbon black and the nano white carbon black are used as combined reinforcing materials to improve the mechanical strength of the rubber and simultaneously exert respective unique advantagesThe device is used for resisting severe environments such as underground high-temperature aging, dynamic load body failure, high extrusion tearing and the like. Wherein, the spraying of the carbon black can also improve the later-period aging resistance of the rubber; the thermal carbon black has the largest particle size (average diameter of 240-320 nm) but the lowest specific surface area of 7-12 m²The thermal cracking carbon black can reduce the compression permanent deformation of rubber and improve the dynamic sealing performance; high specific surface area nano white carbon black (specific surface area is 250 m)²And/g), the primary particle diameter is less than 100nm, and the tear resistance and the wear resistance of the rubber in a high-temperature and high-pressure environment can be greatly improved.

The use of clay as a filler can improve the hardness and acid resistance of the rubber without impairing the processability, and can avoid the problems of difficult processing and low yield of the rubber caused by excessive use of the carbon black reinforcing agent.

Here, in order to improve the processability of the rubber and the fluidity of the material in the mold during vulcanization, a plasticizer may be added to the raw materials for preparation, and the plasticizer may be at least one selected from DOS plasticizer, DOP plasticizer, TP-95 plasticizer and TOTM plasticizer, and further, may be two selected from them, wherein TOTM can improve the high temperature resistance of the rubber and DOS can improve the low temperature resistance of the rubber.

The antioxidant can be at least one of RD antioxidant, 445 antioxidant, ZMTI antioxidant and MB antioxidant, and can be two antioxidants, wherein the antioxidants RD and MB can slow down the aging speed of rubber and prolong the service life of the rubber, and the antioxidants 445 and ZMTI have good synergistic effect.

The di-tert-butylperoxyisopropyl benzene is used for replacing the traditional sulfur as a vulcanizing agent, and because the di-tert-butylperoxyisopropyl benzene is not peroxide, a C-C bond is formed during vulcanization crosslinking, the strength is higher than that of an S-S bond formed during sulfur vulcanization, the structural strength of a rubber molecular chain during vulcanization crosslinking into a net is increased, the temperature resistance and the hydrogen sulfide corrosion resistance are better, and the better structural strength of a rubber body is realized. The effective content of the di-tert-butylperoxycumene may be not less than 40%, for example, 60%.

The N, N' -m-phenylene bismaleimide serves as an auxiliary crosslinking agent and can cooperate with peroxide to accelerate the vulcanization of the hydrogenated nitrile rubber to form a higher crosslinking network structure and crosslinking density so as to prolong the sealing capacity and time. Because the packing time required when the pressure difference resistance reaches 105MPa is longer, namely at least 24h is packed at 177 ℃, a proper amount of crosslinking accelerator can generate the optimal mechanical property.

In another exemplary embodiment of the present invention, as shown in FIG. 1, an integrated downhole tool comprises: the device comprises an expansion joint A, a test valve B, a pressure gauge support cylinder C, a liquid replacement valve D, a plugging valve E, a bidirectional slip hydraulic permanent packer F, a sieve tube G and a perforating gun H. Wherein the bidirectional slip hydraulic permanent packer F may be the same as the packer in the previous exemplary embodiment.

The upper end of the expansion joint A is fixedly connected with an upper oil pipe of the integrated underground operation tool, and the lower end of the expansion joint A is fixedly connected with the upper end of the test valve B. The telescopic joint is arranged, so that the integrated operation tool can stretch up and down in the sleeve, the shrinkage of the integrated underground operation tool is compensated, and the drill floor operation is convenient when the underground operation tool in the later period is out of hand. Here, the connection of the expansion joint to the upper oil pipe and the expansion joint to the test valve may be a threaded connection, however, the invention is not limited thereto, for example, the test valve may be directly connected to the upper oil pipe without passing through the expansion joint or the expansion joint may be indirectly connected to the test valve through a section of oil pipe.

The lower end of the test valve B is fixedly connected with the upper end of a pressure gauge support cylinder C, and an electronic pressure gauge is arranged in the pressure gauge support cylinder C. Here, the test valve is used for testing the flow rate of oil and gas in an oil and gas reservoir during oil testing, and the electronic pressure gauge is used for testing the pressure of underground formations. The lower end of the pressure gauge support cylinder C is fixedly connected with the upper end of the liquid replacement valve D, and the lower end of the liquid replacement valve D is fixedly connected with the upper end of the plugging valve E. The liquid replacing valve is used for replacing and replacing well killing liquid for a well killing, the plugging valve is used for plugging the underground space, the well can be opened and closed by opening and closing the plugging valve, and the opening and closing of the plugging valve can be realized by pressurization in a pipe or annular pressurization.

The lower end of the plugging valve E is connected with the upper end of a bidirectional slip hydraulic permanent packer F, and the bidirectional slip hydraulic permanent packer F can be fixed with the inside of the sleeve and form sealing connection. The lower end of the bidirectional slip hydraulic permanent packer F is connected with the upper end of a sieve tube G, the lower end of the sieve tube G is connected with a perforating gun H, the perforating gun H can perform perforating and reservoir transformation on an oil-gas reservoir, and the sieve tube G can be connected with the perforating gun H and filter oil gas.

When setting, drop into the integration borehole operation instrument from the well head and set up ball 31, set up ball 31 and drop on ball seat core 32, the inside latus rectum of shutoff integration borehole operation instrument. And pressurizing the integrated downhole operation tool, wherein the pressure acts on the upper hydraulic outer cylinder 25 and the annular piston 27 through the first and second inner pressure transfer holes to form an upper and a lower two-stage pistons. When the setting pressure difference reaches the starting setting pressure, the third shearing fixing piece is sheared, the annular piston 27 pushes the upper hydraulic outer cylinder 25 to move upwards, the upper hydraulic outer cylinder 25 pushes the double male short section 24 and the locking ring sleeve 20 to move upwards, the lower slip 19 is propped open, the lower cone 17 is pushed to move upwards to shear the second shearing fixing piece, the rubber cylinder 16 is compressed, and meanwhile, the rubber cylinder 16 pushes the upper cone 14 to move upwards to shear the first shearing fixing piece and prop open the upper slip 13. The upper slips and the lower slips are simultaneously opened and embedded into the casing, and the metal material auxiliary device on the rubber cylinder 16 and the rubber cylinder 16 expand together to contact the inner wall of the casing, so that a protective layer is formed by extruding the rubber cylinder 16. In the process, an inner locking ring 21 on the packer synchronously moves upwards under the action of an elastic element 23, and an upper slip, a lower slip and a rubber barrel are locked in a setting position. After the packer is completely set, casing pressure test is carried out, the sealing performance of the packer and the casing is checked, after the sealing is tested to be qualified, a fourth shearing fixing piece on the setting ball seat 4 is cut off by continuously pressurizing in the integrated underground operation tool, the setting ball 31 and the ball seat core 32 slide down to the underground, the pressure is automatically relieved in the integrated underground operation tool, the full-bore state is kept, and the whole setting procedure is completed. The integrated downhole operation tool performs oil testing, tests and records stratum data.

After the oil testing test is finished, when the integrated downhole operation tool needs to be released from the upper end of the packer, the integrated downhole operation tool is directly lifted and rotates the upper pipe column of the packer by 10-12 circles right and left, the left-handed thread connected with the anchoring sealing assembly 1 and the packer main body 2 is disengaged, and the pipe column above the packer can be lifted out of the well, so that the releasing function is realized. When the well completion is put into operation, the upper pipe column of the integrated downhole operation tool is put into the well for the second time and is connected with the packer in a tieback mode, the guide joint 10 at the front end of the anchoring sealing assembly 1 enters the sealing outer cylinder and the upper core shaft 11 of the packer main body 2, along with the weight of the pipe column which is put down, the left-handed buckle opening elastic claw 8 of the anchoring sealing assembly 1 is meshed into the top thread of the upper core shaft 11, once the pipe column is meshed, the anchoring sealing assembly 1 and the packer main body 2 are safely locked, and the tieback operation is.

In yet another exemplary embodiment of the present invention, the integrated downhole tool may comprise: the device comprises a telescopic joint, a normally closed valve, an RDS circulating valve, a pressure gauge supporting cylinder, an RTTS safety joint, a packer and a temporary plugging ball seat. Wherein the packer may be the same as the bi-directional slip hydraulic permanent packer in the first exemplary embodiment.

The hydraulic pressure control device comprises a telescopic joint, an RDS circulating valve, a pressure gauge support cylinder lower end RTTS safety joint, a bidirectional slip hydraulic packer and a downhole space, wherein the upper end of the telescopic joint can be connected with an upper oil pipe, the lower end of the telescopic joint is fixedly connected with the upper end of a normally-closed valve, the lower end of the normally-closed valve is fixedly connected with the upper end of the RDS circulating valve, the lower end of the RDS circulating valve is fixedly connected with the upper end of the pressure. Here, the temporary plugging ball seat is arranged between the milling extension cylinder and the setting ball seat in the bidirectional slip hydraulic permanent packer. Through setting up the ball seat of temporarily stifled can set up the back of sealing at the packer, drop into temporarily stifled ball in the operation tubular column in the pit to the integration, temporarily shutoff space in the pit. When the underground space needs to be communicated, the temporary plugging ball and the corresponding ball seat core are suppressed by pressurization.

The integrated downhole operation tool can realize the function of temporarily plugging the downhole space, and can be applied to the conditions that the casing cementing quality is poor, the casing pressure-bearing capacity is limited under the clear water condition, and a pressure-controlled tool cannot be used.

In conclusion, the integrated downhole operation tool based on the bidirectional slip hydraulic permanent packer has the following advantages:

the integrated downhole operation tool has the functions of oil testing and well completion commissioning, the setting procedure of the bidirectional slip hydraulic permanent packer is simple, bidirectional bearing and pulling can be realized in a bidirectional pressure-bearing manner, the functions of releasing and secondary tie-back are realized, and a pipe column above the packer can be recycled, maintained or replaced; after releasing the packer, the bidirectional mechanical slips and the internal locking mechanism on the packer can ensure that the packer is stably suspended in the casing, can bear the weight of the lower pipe string, and are suitable for single-trip pipe string well completion operation.

Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims

1. An integrated downhole tool based on a bidirectional slip hydraulic permanent packer, the integrated downhole tool comprising a bidirectional slip hydraulic permanent packer, wherein the packer comprises:

an upper mandrel, a lower mandrel, an upper hydraulic outer cylinder, a lower hydraulic outer cylinder, a first shearing fixing piece, a second shearing fixing piece, a third shearing fixing piece, an upper slip, an upper cone, a rubber cylinder, a lower cone and a lower slip which are sequentially sleeved on the upper mandrel from top to bottom, and an annular piston sleeved on the lower mandrel, wherein,

2. The integrated downhole tool based on the bidirectional slip hydraulic permanent packer as claimed in claim 1, wherein the outer wall of the upper mandrel is provided with one-way teeth for the inner locking ring to slide, and the inner locking ring can slide upwards along the one-way teeth of the outer wall of the upper mandrel.

3. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, wherein the packer further comprises a torsion key capable of fixedly connecting an upper end of the upper slip with an upper mandrel.

4. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, wherein the lower mandrel comprises, in top-down order, a lower mandrel first section, a lower mandrel second section, and a lower mandrel third section, wherein,

the thickness of the second section of the lower mandrel is larger than that of the first section and the third section of the lower mandrel;

the distance from the inner wall of one section of the lower mandrel to the axis is greater than the distance from the inner wall of the three sections of the lower mandrel to the axis, and the upper end of the lower mandrel is formed by one section of the lower mandrel.

5. The integrated downhole tool based on the bidirectional slip hydraulic permanent packer as claimed in claim 1, wherein the rubber cylinder comprises a first elastic member, a second elastic member, an upper rubber cylinder, a middle rubber cylinder and a lower rubber cylinder which are connected in sequence from top to bottom and have the same inner and outer diameters, wherein,

the upper end surface of the upper rubber cylinder is a first annular plane, and the lower end surface of the upper rubber cylinder is an inwardly-recessed first annular curved surface;

the upper end surface of the middle rubber cylinder is a second annular curved surface which protrudes outwards and is matched with the first annular surface, and the lower end surface of the middle rubber cylinder is a third annular curved surface which protrudes outwards;

the upper end surface of the lower rubber cylinder is an inward-concave fourth annular curved surface matched with the third annular curved surface, and the lower end of the lower rubber cylinder is a second annular plane;

the first elastic component is arranged in the upper end of the upper rubber cylinder along the circumferential direction of the first annular plane, so that the upper end of the upper rubber cylinder can bear radial shearing force;

the second elastic component is arranged in the lower end of the lower rubber cylinder along the circumferential direction of the second annular plane, so that the lower end of the lower rubber cylinder can bear radial shearing force.

6. The integrated downhole tool based on the bidirectional slip hydraulic permanent packer of claim 1, wherein the rubber material of the rubber sleeve is prepared from the following raw materials in parts by mass:

7. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 6, wherein the plasticizer comprises at least one of DOS plasticizer, DOP plasticizer, TP-95 plasticizer, and TOTM plasticizer.

8. The integrated downhole tool based on a bidirectional slip hydraulic permanent packer of claim 6, wherein the aging inhibitor comprises at least one of an RD aging inhibitor, a 445 aging inhibitor, a ZMTI aging inhibitor, and an MB aging inhibitor.

9. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, further comprising an anchor seal assembly comprising a spline mandrel, a pilot joint, and an open fluke and a first seal disposed on the spline mandrel from top to bottom, wherein,

the lower end of the spline mandrel can be fixedly connected with the upper end of the guide joint, and the lower end of the guide joint can be inserted into the inner cavity of the upper mandrel.

10. The integrated downhole tool based on the bidirectional slip hydraulic permanent packer of claim 9, wherein the anchoring seal assembly further comprises a backstop ring, a backstop nipple sleeved on the spline mandrel from top to bottom, wherein,

the backstop short section is arranged at the upper part of the open anchor fluke.

11. The integrated downhole tool based on a bidirectional slip hydraulic permanent packer of claim 9, wherein the inner wall of the top of the upper mandrel is provided with an internal thread adapted to the open fluke.

12. The integrated downhole tool based on the bidirectional slip hydraulic permanent packer of claim 9, further comprising a milling extension cylinder, wherein the milling extension cylinder is a hollow cylinder, and the upper end of the milling extension cylinder can be connected with the lower end of the lower mandrel, and the lower end of the milling extension cylinder can be connected with a tubing.

13. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, further comprising a setting ball seat comprising a shear outer barrel, a ball seat core, and a fourth shear fixture, wherein,

the ball seat core is of a hollow structure and comprises an upper opening and a lower opening, and the ball seat core is arranged in an inner cavity of the shearing outer barrel and is connected with the inner wall of the shearing outer barrel through a fourth shearing fixing piece.

14. The integrated downhole tool based on a bidirectional slip hydraulic permanent packer of claim 13, wherein the setting ball seat further comprises a second seal to effect a seal between the ball seat core and the inner wall of the shear outer barrel.

15. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 13, wherein the setting ball seat further comprises a setting ball that can be dropped from a wellhead onto the ball seat core to seal off a tubing drift.

16. The integrated downhole tool based on the bidirectional slip hydraulic permanent packer of claim 1, further comprising a test valve, a pressure gauge support cylinder, a liquid replacement valve and a plugging valve which are sequentially connected from top to bottom and finally connected to the bidirectional slip hydraulic permanent packer.

17. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, further comprising an expansion joint capable of expanding and contracting the integrated downhole tool in a casing in an up-down direction.

18. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, further comprising a screen coupled to the setting ball seat.

19. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, further comprising a perforating gun coupled to the screen, the perforating gun capable of perforating the reservoir for a formation modification.

20. The integrated downhole tool based on a bi-directional slip hydraulic permanent packer of claim 1, further comprising: the device comprises a telescopic joint, a normally closed valve, an RDS circulating valve, a pressure gauge support cylinder, an RTTS safety joint, a temporary plugging ball seat and a setting ball seat.