CN114837599B

CN114837599B - High-temperature high-pressure recoverable packer

Info

Publication number: CN114837599B
Application number: CN202210514723.8A
Authority: CN
Inventors: 李良辉; 赖伟华; 庞瑞杰; 李江平; 刘建锋; 陈仁锦; 庞富增
Original assignee: Baiqin Energy Technology Huizhou Co ltd
Current assignee: Baiqin Energy Technology Huizhou Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-11-04
Anticipated expiration: 2042-05-12
Also published as: CN114837599A

Abstract

The invention discloses a high-temperature high-pressure recoverable packer which comprises a mandrel, an upper end sealing assembly and a lower end connector which are arranged at the upper end and the lower end of the mandrel, and a sealing rubber cylinder assembly, a stopping anti-loosening assembly, a high-bearing anchoring slip assembly and a deblocking recovery assembly which are sequentially sleeved on the outer side of the mandrel from top to bottom, wherein the sealing rubber cylinder assembly, the stopping anti-loosening assembly, the high-bearing anchoring slip assembly and the deblocking recovery assembly are detachably connected. This application is through the reducing step of two sealed faces of a little external diameter and a big external diameter constitution of design on the dabber, sits and seals the sealed cartridge subassembly of gluing and finally struts the inflation at the sealed face of big external diameter after sealing, receives radial compression and axial compression, makes to have more abundant magnitude of interference between sealed cartridge subassembly and the casing wall, lets the ability that the packer seals off pressure in the pit more reliable, more stable, withstand voltage higher.

Description

High-temperature high-pressure recoverable packer

Technical Field

The invention relates to the technical field of oil and gas field well completion tools, in particular to a high-temperature high-pressure recoverable packer.

Background

With the abundant oil and gas reservoirs stored in deeper stratum and the depletion of shallow oil and gas reservoirs reduced, the rapid development of deep well drilling and completion technology is promoted. However, the deeper stratum has more complicated well conditions, which are represented by high temperature of more than 180-204 ℃ and high pressure of more than 15000PSI, and when the existing packer in the market carries out well completion or oil and gas production operation under the extremely complicated well conditions of high temperature and high pressure of over 204 ℃ and 15000PSI, the common sealing rubber sleeve element is easily damaged under the influence of high temperature and high pressure, so that pressure leakage and packer sealing failure are caused, and well completion failure and production accidents are caused.

The general anchoring slip is easily deformed and attenuated due to the structure and material thereof under the influence of high temperature and high pressure, so that the anchoring of the packer is not firm or the anchoring capability is weakened, for example, the lower end of the anchoring slip carries too many pipe strings or the anchoring slip is easily broken or slides due to the heavy weight of the anchoring slip, so that the pipe strings fall to the bottom of a well, and the upward jacking force easily causes the sliding of the packer so that the pipe strings are jacked to collide with wellhead equipment to form blowout, thereby causing well completion failure and serious production accidents.

The anchoring slip with a general structure has no design of advance-prevention setting, when the anchoring slip is set in advance and anchored in a casing in the case of casing deformation and uneven inner diameter circumference or foreign matters and the anchoring slip is set in advance in the case of blocking, a tubular column needs to be operated forcibly to enable the anchoring of the packer to be tighter, and finally a milling tool needs to be used for milling the packer, so that the well completion cost is increased, the construction period is prolonged, and the well completion risk is increased.

The general packer is a permanent packer, once the packer is set, the packer can only work permanently and cannot be recycled, the subsequent pipe column is inconvenient to replace and maintain, and only a milling tool can be lowered to mill the packer, so that the well completion cost is increased, and the construction period is delayed. And part of packers are designed with hydraulic shearing deblocking structures, but the hydraulic deblocking success rate is low, the packers are very easily affected by the upper jacking force formed by underground pressure, the deblocking force is inaccurate, and if the packers are applied to high-temperature and high-pressure wells, the packers are pushed by the upper jacking force formed by underground high pressure to automatically shear deblocking, so that the pipe strings are pushed by the extremely high upper jacking force to collide with wellhead production trees, and blowout accidents and equipment are seriously damaged.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a high-temperature high-pressure recoverable packer.

The invention discloses a high-temperature high-pressure recoverable packer, which comprises a mandrel, upper end sealing assemblies and lower end joints which are arranged at the upper end and the lower end of the mandrel, and a sealing rubber cylinder assembly, a stopping anti-loosening assembly, a high-bearing anchoring slip assembly and a deblocking recovery assembly which are sequentially sleeved outside the mandrel from top to bottom, wherein the sealing rubber cylinder assembly, the stopping anti-loosening assembly, the high-bearing anchoring slip assembly and the deblocking recovery assembly are detachably connected;

sealed cartridge subassembly and dabber junction of gluing is provided with the reducing step, and the both ends of sealed cartridge subassembly are the butt respectively and are equipped with the cover and locate spindle epaxial upper end sleeve and component sheath, and upper end sleeve can slide relative to the dabber, and fixes at the spindle through countersunk head screw and first shear screw, and the component sheath is through setting up the epaxial upper end split ring joint in spindle, is provided with the biography pressure hole between upper end split ring and the dabber, and the upper end of dabber is provided with the upper end guide.

Preferably, the sealing glue cylinder assembly comprises an upper end support ring, an upper end baffle ring, an upper end glue cylinder element, a middle glue cylinder element, a lower end baffle ring and a lower end support ring which are sequentially sleeved on the outer side of the mandrel from top to bottom.

Preferably, the retaining anti-loosening assembly comprises a piston cylinder, a piston, a clamping ring sleeve, a shearing ring, a connector and a lower-stop inner clamping ring which are sequentially sleeved outside the mandrel from top to bottom, and one end of the piston cylinder is in threaded connection with the element sheath;

one end of the piston extends into the piston cylinder, and the other end of the piston is abutted with the connector;

the clamping ring sleeve and the shearing ring are sleeved on the outer side of the piston, one end of the clamping ring sleeve is in threaded connection with the other end of the piston cylinder, the other end of the clamping ring sleeve is in threaded connection with the shearing ring, an upper movable inner clamping ring is arranged between the clamping ring sleeve and the piston, a pin hole of the clamping ring sleeve is opposite to an open slot of the upper movable inner clamping ring and is provided with an anti-rotation fixing pin, and the shearing ring and the piston are fixed through a first guide set screw and a second shearing screw;

the inner side of one end of the connector is connected with the piston through threads, and the other end of the connector is connected with the high-bearing anchoring tile clamp assembly.

Preferably, the outer side of the piston is provided with piston stopping teeth, the inner side and the outer side of the upper moving inner snap ring are respectively provided with inner diameter upper moving stopping teeth and outer diameter upper moving stopping teeth which are matched with the piston stopping teeth, the inner side of the snap ring sleeve is provided with sleeve stopping teeth which are matched with the outer diameter upper moving stopping teeth, the inner side of the lower moving inner snap ring is provided with lower moving stopping teeth, and the outer side of the mandrel is provided with mandrel stopping teeth which are matched with the lower moving stopping teeth.

Preferably, high bearing anchoring slips subassembly includes from last to overlapping the upper end centrum, the lower extreme centrum of locating the dabber outside in proper order down and the tubbiness anchoring slips of joint in the upper end centrum and the lower extreme centrum outside, tubbiness anchoring slips makes up upper end centrum and lower extreme centrum into an organic whole, and upper end centrum and lower extreme centrum are fixed on the dabber through two sets of second direction holding screws and first shear pin respectively.

Preferably, the parts of the outer side of the barrel-shaped anchoring slip close to the upper end cone and the lower end cone are respectively provided with downward anchoring teeth and upper end non-full cutting grooves which are arranged in a staggered manner, and upward anchoring teeth and lower end non-full cutting grooves which are arranged in a staggered manner, the inner side of the barrel-shaped anchoring slip is sequentially provided with a small inclination angle, a meshing groove, a double meshing groove and a double small inclination angle from top to bottom, the outer side of the upper end cone is provided with a double meshing step corresponding to the meshing groove, and the outer side of the lower end cone is provided with a triple meshing step corresponding to the double meshing groove.

Preferably, the deblocking recovery assembly comprises a shaft sleeve, a shearing sleeve, a buckling ring and a deblocking sleeve which are sequentially sleeved on the outer side of the mandrel from top to bottom, one end of the shaft sleeve is in threaded connection with the outer side of the lower-end cone, the other end of the inner side of the shaft sleeve is positioned through a lower-end split ring arranged on the outer side of the mandrel, two ends of the shearing sleeve are in threaded connection with the shaft sleeve and the lower-end joint respectively, and the shearing sleeve and the deblocking sleeve both extend towards the outside of the mandrel and are connected with the lower-end joints respectively;

the clamping ring is in threaded connection between the mandrel and the shearing sleeve, and one end of the clamping ring is abutted against the end part of the shaft sleeve;

the deblocking sleeve is located and cuts the sleeve inboard, its both ends respectively with axle sleeve and lower extreme joint threaded connection, through third shear screw connection between deblocking sleeve and the shearing sleeve, the inboard that the deblocking sleeve stretches out dabber part is provided with location shrink step and buckle step, location shrink step and the adjacent setting of buckle step.

Preferably, the joint of the unsealing sleeve and the buckle ring is provided with an unsealing groove, and the outer side of the mandrel is provided with a sealing surface opposite to the unsealing groove.

Preferably, the upper end sealing assembly comprises an upper end sleeve arranged at the top end of the mandrel, a left-handed thread, a first stop step, a second stop step and a sealing element for sealing the upper end sleeve, wherein the left-handed thread, the first stop step and the second stop step are sequentially arranged on the inner side of the upper end sleeve from top to bottom.

Preferably, the recoverable packer of high temperature high pressure still includes the deblocking and retrieves the instrument, and the deblocking is retrieved the instrument and is included the body and set gradually pawl, spring housing and the lug in its outside along body axis direction, and the outside of pawl activity suit in the body, and fix on the body through top shear pin, and the spring housing is fixed on the body through release shear pin, is provided with the chucking step that can lock mutually with the buckle step on the lug.

The beneficial effect of this application lies in:

(1) By designing the reducing step consisting of two sealing surfaces of a small outer diameter and a large outer diameter on the mandrel, the sealing rubber barrel assembly is finally expanded on the sealing surface of the large outer diameter after setting, and is subjected to radial compression and axial compression, so that more sufficient interference exists between the sealing rubber barrel assembly and the wall of a casing, and the sealing and isolating capacity of the packer for underground pressure is more reliable, more stable and higher in pressure resistance.

(2) On one hand, the upper stop inner snap ring of the inner stop tooth and the outer stop tooth is arranged, so that the sealing rubber barrel assembly is locked after the packer is set and pressure is relieved and is not contracted by axial retreat, and the expansion sealing is kept. On the other hand, the lower stop inner snap ring only provided with the inner stopping teeth is matched with the mandrel stopping teeth, so that the barrel-shaped anchoring tile clip on the high-bearing anchoring tile clip assembly keeps expansion anchoring, the axial contraction of the barrel-shaped anchoring tile clip is prevented, and the possibility that the packer slips due to insecure anchoring caused by the shrinkage of the tile clip is reduced.

(3) The barrel-shaped anchoring slip is processed into an elastic whole, because the contact area of the multi-petal slip after cutting and the meshing of the sleeve is larger and more than that of the slip with few petals, after the packer is set, the slip anchoring sleeve is extremely firm and more uniform, the damage to the sleeve is less, and the subsequent secondary is convenient to enter the pipe string. And after the barrel-shaped anchoring slip and the cone are buckled at a small inclination angle, the barrel-shaped anchoring slip can be lifted or lowered under the action of the first shear pin when the packer is stuck in a well, and the small inclination angle and the first shear pin can prevent the barrel-shaped anchoring slip from opening so as to relieve the risk of sticking and prevent the packer from being set in advance.

(4) The setting can use supporting deblocking to retrieve the instrument and carry out mechanical type to the deblocking and retrieve the subassembly and retrieve, does not receive the top force influence of high pressure formation in the pit, and the recovery mode is simple reliable, makes the packer avoid being milled, or receives the top force and cuts the deblocking by oneself, leads to the pipe cluster to be pushed the risk of top collision well head production tree by high top force, has moreover that the recovery mode is simple reliable, the success rate is high, construction cycle is short, advantage with low costs.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of a high-temperature high-pressure recoverable packer of the present embodiment;

FIG. 2 is a perspective view of the high temperature and high pressure retrievable packer of the present embodiment;

FIG. 3 is a schematic view of the construction of the sealant cartridge assembly;

FIG. 4 isbase:Sub>A sectional view taken along the line A-A in FIG. 1 according to the present embodiment;

FIG. 5 is a schematic view of the retaining anti-loosening assembly of the present embodiment;

FIG. 6 is a sectional view taken along line B-B of FIG. 1 in accordance with the present embodiment;

FIG. 7 is a schematic view of the construction of the high load-bearing anchoring slip assembly of this embodiment;

FIG. 8 is a sectional view taken along the plane C-C in FIG. 1 according to the present embodiment;

FIG. 9 is a schematic view of the external structure of the barrel-shaped anchoring slip of the present embodiment;

FIG. 10 is a schematic diagram of a decapsulation recovery module according to the present embodiment;

FIG. 11 is a sectional view taken along line D-D of FIG. 1 in accordance with the present embodiment;

FIG. 12 is a schematic structural view of the upper end seal assembly of the present embodiment;

FIG. 13 is a schematic diagram of the upper end seal assembly and the seal assembly of the present embodiment;

FIG. 14 is a schematic structural diagram of a decapsulation and retrieval tool according to the embodiment;

FIG. 15 is a perspective view of the recovering tool of this embodiment;

FIG. 16 is a schematic view of the setting state of the high-temperature high-pressure retrievable packer of the embodiment;

FIG. 17 is a perspective view of the high temperature and high pressure recoverable packer of this embodiment in a set state;

FIG. 18 is a perspective view of the high temperature and high pressure retrievable packer of this embodiment in an unset state;

FIG. 19 is a schematic view of the high-temperature high-pressure recoverable packer unset state according to this embodiment.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the sake of simplicity, certain well-known and conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indicators in the embodiments of the present invention, such as upper, lower, left, right, front and rear \8230; \8230, are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to order or sequence, and do not limit the present invention, but only distinguish the elements or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:

refer to fig. 1 and 2. The high-temperature high-pressure recoverable packer in the embodiment comprises a mandrel 1, an upper end sealing assembly 2 and a lower end connector 3 which are arranged at the upper end and the lower end of the mandrel 1, and a sealing rubber cylinder assembly 4, a stopping anti-loosening assembly 5, a high-bearing anchoring slip assembly 6 and a deblocking recovery assembly 7 which are sequentially sleeved outside the mandrel 1 from top to bottom, wherein the sealing rubber cylinder assembly 4, the stopping anti-loosening assembly 5, the high-bearing anchoring slip assembly 6 and the deblocking recovery assembly 7 are detachably connected.

Referring to fig. 3 and 4, a variable diameter step 11 is disposed at a joint of the sealant cartridge assembly 4 and the mandrel 1, two ends of the sealant cartridge assembly 4 are respectively abutted to an upper end sleeve 12 and an element sheath 13, which are sleeved on the mandrel 1, the upper end sleeve 12 can slide relative to the mandrel 1 and is fixed on the mandrel 1 through a countersunk head screw 14 and a first shear screw 15 (see fig. 3), the element sheath 13 is clamped through an upper end split ring 16 disposed on the mandrel 1, a pressure transmission hole 17 is disposed between the upper end split ring 16 and the mandrel 1, and an upper end guide 18 is disposed at an upper end of the mandrel 1.

In the present embodiment, as shown in fig. 3, the variable diameter step 11 is composed of a large sealing surface and a small sealing surface, and during setting, the sealing rubber sleeve assembly 4 is finally expanded on the sealing surface with the large outer diameter after setting, and is subjected to radial compression and axial compression, so that a more sufficient interference exists between the rubber sleeve element and the sleeve wall.

Referring to fig. 4, in order to ensure the stability of the installation, a plurality of countersunk head screws 14 and a plurality of first shear screws 15 are provided, and the countersunk head screws 14 and the first shear screws 15 are distributed on the outer side of the circumference of the mandrel 1 in a staggered manner.

Specifically, with reference to fig. 2, the sealing rubber cartridge assembly 4 includes an upper end support ring 41, an upper end stop ring 42, an upper end rubber cartridge element 43, a middle rubber cartridge element 44, a lower end rubber cartridge element 45, a lower end stop ring 46, and a lower end support ring 47, which are sleeved on the outer side of the mandrel 1 from top to bottom.

In this embodiment, the upper rubber sleeve element 43, the middle rubber sleeve element 44 and the lower rubber sleeve element 45 are all made of high-grade high-temperature-resistant materials, one of the upper baffle ring 42 and the lower baffle ring 46 is made of high-ductility metal, and the other one is made of high-yield-strength metal. Because the rubber sleeve element is made of high-grade high-temperature-resistant materials, the packer has more reliable and stable packing capacity with higher pressure resistance under severe and complex well conditions.

Referring to fig. 1 and 5, the anti-back-off anti-loose assembly 5 includes a piston cylinder 51, a piston 52, a snap ring sleeve 53, a shear ring 54, a connector 55, and a lower-stop inner snap ring 56, which are sequentially sleeved on the outer side of the mandrel 1 from top to bottom, and one end of the piston cylinder 51 is in threaded connection with the element sheath 13. One end of the piston 52 extends into the piston cylinder 51, and the other end abuts against the connector 55.

The piston 52 is sleeved with the snap ring sleeve 53 and the shearing ring 54, one end of the snap ring sleeve 53 is in threaded connection with the other end of the piston cylinder 51, the other end of the snap ring sleeve is in threaded connection with the shearing ring 54, an upper movable inner snap ring 531 is arranged between the snap ring sleeve 53 and the piston 52, a pin hole of the snap ring sleeve 53 is opposite to an open slot of the upper movable inner snap ring 531 and is provided with an anti-rotation fixing pin 532, and the shearing ring 54 and the piston 52 are fixed through a first guide set screw 541 and a second shearing screw 542, please refer to fig. 6.

The connector 55 has one end threaded on the inside to the piston 52 and the other end connected to the high load bearing anchoring shoe assembly 6.

Preferably, the piston 52 is provided with piston stopping teeth on the outer side, the upper moving inner snap ring 531 is provided with inner diameter upper moving stopping teeth and outer diameter upper moving stopping teeth on the inner and outer sides, respectively, which are matched with the piston stopping teeth, the snap ring sleeve 53 is provided with sleeve stopping teeth matched with the outer diameter upper moving stopping teeth on the inner side, the lower moving stopping teeth on the inner snap ring 56 is provided on the inner side, and the mandrel 1 is provided with mandrel stopping teeth matched with the lower moving stopping teeth on the outer side.

On one hand, an upper stop inner snap ring 531 with inner and outer stop teeth is arranged, so that the sealing rubber barrel assembly 4 is locked after the packer is set and pressure is relieved, the axial retreat and contraction of the sealing rubber barrel assembly are avoided, and the expansion and sealing of the sealing rubber barrel assembly are kept. On the other hand, a lower stop inner snap ring 56 with only inner stop teeth is arranged and is matched with the mandrel stop teeth, so that the barrel-shaped anchoring tile clamp 63 on the high-bearing anchoring tile clamp assembly 6 keeps expansion anchoring, the axial contraction of the barrel-shaped anchoring tile clamp is prevented, and the possibility that the packer is not firmly anchored to slide due to the contraction of the tile clamp is reduced.

Referring to fig. 7, the high load-bearing anchoring slip assembly 6 includes an upper end cone 61, a lower end cone 62 and a barrel-shaped anchoring slip 63 fastened to the outer sides of the upper end cone 61 and the lower end cone 62, which are sequentially sleeved on the outer side of the mandrel 1 from top to bottom, the barrel-shaped anchoring slip 63 integrally combines the upper end cone 61 and the lower end cone 62, and the upper end cone 61 and the lower end cone 62 are respectively fixed on the mandrel 1 through two sets of second guiding set screws 601 and first shear pins 602.

Referring to fig. 8, a first shear pin 602 is used to secure the two vertebral bodies and the barrel anchor slip 63, while a second pilot set screw 601 extends into a pilot slot on the mandrel 2.

Referring to fig. 7 and 9, the outer side of the barrel-shaped anchoring slip 63 near the upper end cone 61 and the lower end cone 62 is respectively provided with downward anchoring teeth 631 and upper end non-full cutting grooves 632, and upward anchoring teeth 633 and lower end non-full cutting grooves 634, which are staggered, the inner side of the barrel-shaped anchoring slip 63 is sequentially provided with a small inclination angle 635, an engagement groove 636, a double engagement groove 637 and a double small inclination angle 638 from top to bottom, the outer side of the upper end cone 61 is provided with a double engagement step 611 corresponding to the engagement groove 636, and the outer side of the lower end cone 62 is provided with a triple engagement step 621 corresponding to the double engagement groove 637.

The corresponding small inclined angles are respectively arranged at the tail ends of the corresponding meshing grooves, and the meshing steps on the upper and lower centrums increase the supporting area of the barrel-shaped anchoring tile clamp 63, so that more anchoring teeth on the outer diameter of the tile can be supported. The tubbiness anchor slips axle 63 has upwards cut many thin grooving, lower extreme incomplete grooving 634 and upper end incomplete grooving 632 promptly, process tubbiness anchor slips 63 elastic whole, because the area of contact of the many lamellas of number slips after the cutting and sleeve pipe interlock is bigger more than the few lamellas of number slips, after the packer setting, slips anchor sleeve pipe is extremely firm and more even, and is littleer to the sleeve pipe injury, makes things convenient for subsequent secondary to go into the pipe cluster down.

The downward anchoring teeth 631 can enable the packer to have higher bearing capacity and the function of hanging more pipe strings at the lower end, the upward anchoring teeth 633 can enable the packer to bear the upward jacking force formed by high pressure in the well, and the small inclination angles at the meshing step of the cone and the meshing groove of the inner diameter of the slip are tightly attached to each other, so when the packer is unpacked and recovered, the mandrel 1 is lifted to drive the upper cone 61 to hook the barrel-shaped anchoring slip 63 due to the small inclination angle 635 so as to apply axial and radial contraction force, so that the barrel-shaped anchoring slip 63 is more reliably contracted, and the packer can be recovered smoothly. After the barrel-shaped anchoring slip 63 and the cone are buckled at a small inclination angle, due to the action of the first shear pin 602, when the packer is stuck in a well, the packer can be lifted or lowered, and the small inclination angle 635 and the first shear pin 602 can prevent the barrel-shaped anchoring slip 63 from opening, so that the risk of sticking is relieved, and the packer is prevented from being set in advance.

Referring to fig. 1 and 10, the deblocking recovery assembly 7 includes a shaft sleeve 71, a shearing sleeve 72, a snap ring 73, and a deblocking sleeve 74, which are sequentially sleeved on the outer side of the mandrel 1 from top to bottom, one end of the shaft sleeve 71 is screwed on the outer side of the lower end cone 62, the other end of the inner side of the shaft sleeve 71 is positioned by a lower end snap ring 19 disposed on the outer side of the mandrel 1, two ends of the shearing sleeve 72 are respectively screwed with the shaft sleeve 71 and the lower end connector 3, the shearing sleeve 72 and the deblocking sleeve 74 both extend to the outside of the mandrel 1 and are respectively connected with the lower end connector 3, the snap ring 73 is screwed between the mandrel 1 and the shearing sleeve 74, and one end of the shearing sleeve is abutted against the end of the shaft sleeve 71. The unsealing sleeve 74 is located inside the shearing sleeve 72, two ends of the unsealing sleeve are respectively in threaded connection with the shaft sleeve 71 and the lower end connector 3, the unsealing sleeve 74 and the shearing sleeve 72 are connected through a third shearing screw 701 (see fig. 11), a positioning shrinkage step 741 and a buckling step 742 are arranged on the inner side of the part, extending out of the mandrel 1, of the unsealing sleeve 74, and the positioning shrinkage step 741 and the buckling step 742 are arranged adjacently.

The setting can use supporting deblocking recovery tool 8 to carry out mechanical type and retrieve like this, does not receive the top force influence that the high pressure formed in the pit, and the recovery mode is simple reliable, makes the packer avoid being milled, or receives the top force and cuts the deblocking by oneself, leads to the pipe cluster to be pushed the risk of bumping well head production tree by high top force, has the advantage that the recovery mode is simple reliable, the success rate is high, construction cycle is short, with low costs moreover.

Preferably, the joint of the unsealing sleeve 74 and the snap ring 73 is provided with an unsealing groove 741, and the outside of the mandrel 1 is provided with a sealing surface 101 opposite to the unsealing groove 741. The unsealing groove 741 can accommodate the snap ring 73 which is expanded and sprung open after unsealing, and the snap ring 73 is expanded and sprung open in the unsealing groove 741 so as not to screw-fasten the mandrel 1.

Referring to fig. 12 and 13, the upper sealing assembly 2 includes an upper sleeve 21 disposed on the top end of the mandrel 1, a left-handed thread 22 disposed on the inner side of the upper sleeve 21 from top to bottom, a first stopping step 23, a second stopping step 24, and a sealing member 25 for sealing the upper sleeve 21. The inner side wall of the upper end sleeve 21, the first stop step 23 and the second stop step 24 are smooth surfaces. The upper end sealing assembly 2 can be used for being inserted into sealing connection and sending the packer to the underground for setting, when a pipe string at the upper end of the packer needs to add, remove or maintain tools, the upper end of the packer only needs to be rightwards and upwards inserted into the ground for sealing, and the risk of well completion accidents caused by repeated recovery/setting of the packer is avoided.

Referring to fig. 13, the outer side of the sealing member 25 is provided with a thread capable of being screwed with the left-hand thread 22, and after being inserted into the upper end sleeve 21, the sealing member 25 seals the smooth surface and abuts against the second stopping step 24.

Referring to fig. 14 and 15, the high-temperature and high-pressure recoverable packer further comprises a deblocking recovery tool 8, wherein the deblocking recovery tool 8 comprises a body 81, and a pawl 82, a spring sleeve 83 and a lug 84 which are sequentially arranged on the outer side of the body 81 along the axial direction of the body 81, the pawl 82 is movably sleeved on the outer side of the body 81 and is fixed on the body 81 through a top shear pin 821, the spring sleeve 83 is fixed on the body 81 through a release shear pin 831, and a clamping step 841 capable of being buckled with a buckling step 742 is arranged on the lug 84. The outside of the pawl 82 is provided with a thread that threadably interconnects with the left-hand thread 22.

During specific installation, corresponding sealing rings and check rings are installed on sealing grooves of all parts in advance, the outer diameter of the lower end of the mandrel 1 is smaller than that of the upper end of the mandrel 1, all parts are assembled on the mandrel 1 in a sliding mode from the lower end, the upper end guide 18 is connected to the upper end of the mandrel 1 in a threaded mode, the upper end sleeve 12 is installed on the mandrel 1, the grooves and the screw holes in the mandrel 1 are aligned, and the countersunk head screws 14 and the first shear screws 15 are installed.

Installation of the sealant cartridge assembly 4: the upper end support ring 41, the upper end baffle ring 42, the upper end rubber sleeve element 43, the middle rubber sleeve element 44, the lower end rubber sleeve element 45, the lower end baffle ring 46 and the lower end support ring 47 are sequentially installed, then the element sheath 13 and the upper end split ring 16 are sequentially installed on the mandrel 1, the piston cylinder 51 is in threaded connection with the element sheath 13, and the upper end seal assembly 2 is installed at the end part of the mandrel 1.

Installation of the retaining anti-loosening assembly 5: successively install piston 52, snap ring sleeve 53, shear ring 54, go up stop motion interior snap ring 531 on dabber 1, and snap ring sleeve 53 and piston cylinder 51 threaded connection, make snap ring sleeve 53's pinhole and the open slot of going up stop motion interior snap ring 531 aim at and install the anti-rotation fixed pin, avoid rotatory for shear ring 54 aligns with hole, groove and groove of piston 52, first direction holding screw 541 and second shear screw 542 constitute the anti-looseness mechanism that stops altogether. The connector 55 is screwed on the piston 52, then the lower stop inner snap ring 56 is arranged on the mandrel 1, and the lower stop teeth and the mandrel stop teeth are meshed with each other to form a lower stop anti-loosening mechanism.

Installation of the high load bearing anchoring tile clamp assembly 6: the upper end cone body 61, the lower end cone body 62 and the barrel-shaped anchoring tile clamp 63 are forcedly combined into a sub-assembly body in advance, the sub-assembly body is installed on the mandrel 1, the upper end cone body 61 is in threaded connection with the connector 55, two groups of pin grooves on the barrel-shaped anchoring tile clamp 63 are aligned with pin holes on the upper end cone body 61 and the lower end cone body 62 respectively, meanwhile, a threaded hole of the lower end cone body 62 is aligned with a guide groove on the mandrel 1, and a first shearing pin 602 and a second guiding set screw 601 are installed on the pin grooves and the threaded hole respectively, so that the high-bearing anchoring tile clamp assembly 6 is formed, and the guide groove can ensure that the high-bearing anchoring tile clamp assembly 6 moves along the axial direction of the mandrel 1 during working and cannot rotate.

Installation of the decapsulation recovery module 7: install lower extreme split ring 19 on dabber 1, axle sleeve 71 threaded connection is on lower extreme centrum 62, install buckle ring 73 on dabber 1 again, and make the fixed screw-thread fit dabber fixed screw thread of buckle ring 73, install deblocking sleeve 74 on dabber 1 again, overlap shearing sleeve 72 on deblocking sleeve 74, and align screw hole installation third shear screw 701, then make shearing sleeve 72 and axle sleeve 71 threaded connection firm, with lower extreme joint 3 threaded connection on shearing sleeve 72, constitute deblocking recovery subassembly 7 jointly.

During specific work, the well entering state, the setting state and the unsetting state are provided according to the work sequence, and the following detailed description is given according to the three states.

Entering a well:

in the well entering state, please refer to fig. 1 and 13, each part of the packer is in the initial position, the setting pin and the unsetting pin are correctly installed according to the requirement, a setting tool (a sealing element 25) is inserted into an upper end sleeve 21 at the upper end of the mandrel 1, the sealing element 25 seals the smooth surface, the thread on the sealing element 25 is connected and matched with the left-hand thread 22 and simultaneously props against a second stop step 24, and the pipe string is carried into the preset setting well section.

Setting state:

in a setting state, as shown in fig. 16 and 17, when a hydraulic pressure is applied to set the packer on the ground, the hydraulic pressure enters the piston 52 from the pressure transmission hole 17, when the pressure reaches a certain value, the second shearing screw 542 is sheared, the element sheath 13, the piston cylinder 51 and the upper stopping anti-loosening mechanism are continuously pressed and pushed to slide upwards, the sealing rubber sleeve assembly 4 is extruded, three rubber sleeve elements start to expand, two baffle rings and two support rings are extruded to deform and turn upwards, the first shearing screw 15 is sheared by the extrusion thrust, the upper end sleeve 12 slides along the groove to push against the mandrel 1, the sealing rubber sleeve assembly 4 is pushed to the reducing step 11, finally, when the pressure reaches the setting force of the packer, the pressurization is stopped, the sealing rubber sleeve assembly 4 expands at the large outer diameter sealing surface of the mandrel 1 and seals the inner hole of the sleeve, and the empty space of the oil sleeve ring is cut off;

meanwhile, the piston 52, the connector 55, the upper end cone 61 and the lower stopping and locking mechanism are pushed by hydraulic pressure to slide downwards to cut the first shear pin 602, the barrel-shaped anchoring slip 63 is supported by the upper end cone 61 and the lower end cone 62 to expand and is anchored on the inner diameter of the sleeve, at this time, an upper moving inner snap ring 531 in the upper stopping and locking mechanism is designed with an outer diameter upper moving stopping tooth to clamp a sleeve stopping tooth on the snap ring sleeve 53 and an inner diameter upper moving stopping tooth to clamp a piston stopping tooth on the piston 52, and a lower stopping inner snap ring 56 in the lower stopping and locking mechanism is designed with a lower moving stopping tooth to clamp a mandrel stopping tooth on the mandrel 1. The upper stop anti-loose mechanism only can slide upwards but cannot slide downwards; the lower retaining and anti-loosening mechanism has the function of preventing the lower retaining and anti-loosening mechanism from falling only by sliding downwards but not sliding upwards. The setting hydraulic pressure is removed, the sealing rubber barrel assembly 4 is locked by the backstop anti-loosening assembly 5 and cannot rebound and shrink, so that the inner hole of the sleeve is sealed, and the annulus of the oil sleeve is isolated; the high bearing anchoring slip assembly 6 is locked by the backstop anti-loosening assembly 5 and cannot rebound and contract, so that the high bearing anchoring slip assembly is firmly anchored on the inner hole of the sleeve, has high bearing capacity and bears high pressure from the underground top, and the setting of the packer is finished.

And (3) deblocking state:

in the unset state, the unset recovery tool 8 is run in and inserted into the inner diameter of the packer as shown in fig. 18 and 19. The pawl 82 at the top of the unset recovery tool 8 catches the mandrel 1 of the packer. The column is lifted up with a force of 4.5t to ensure that the pawl thread teeth grip the left hand thread 22 on the upper end sleeve 21. The lifting is continued until the top shear pin 821 of the deblocking recovery tool 8 is sheared off. The release recovery tool 8 is then lowered so that the catch steps 841 on the lugs 84 snap over the catch steps 742 on the lower and release sleeves 74. The shear third shear screw 701 is lifted up causing the release sleeve 74 to move up. At this point the snap ring 73 is released and the mandrel 1 can move upwards. After the release sleeve 74 is moved up, the release shear pin 831 on the spring housing 83 of the release recovery tool 8 is sheared. The lifting force is then transferred to the packer mandrel 1 and the split upper end ring 16 of the mandrel 1 will seize the element sheath 13, piston cylinder 51, piston 52 and upper end cone 61, causing it to no longer support the barrel anchoring slips 63, causing the slips to contract out of contact with the casing internal diameter and the sealant cartridge assembly 4 to also elastically contract out of contact with the interference casing internal diameter. And simultaneously, the lower end split ring 19 of the mandrel 1 clamps the lower end cone 63, and simultaneously bears the lower end joint 3 and the weight of the lower end pipe string. Once the mandrel 1 completes the release stroke, the packer is fully unset and the upper string weight is now visible from the hanging weight table. And (4) slowly lifting the pipe column by the length of one pipe column, and confirming the unsealing of the packer.

To sum up: the design of dabber 1 has the pressure transmission hole 17, can let the setting hydraulic pressure pass through and get into piston 52, and the design has reducing step 11, can cooperate sealed cartridge subassembly 4 to have bigger magnitude of interference between the back of sitting and the sleeve pipe, the design has dabber stopping tooth can cooperate lower locking snap ring 56 to play and prevent the effect that anchoring slips axially retreated the shrink, dabber 1 design has the shear pin counter bore can cooperate upper and lower end cone to fix tubbiness anchoring slips 63, prevent the cone drunkenness and avoid sitting in advance and seal the anchoring, the design has the dabber guide way when the packer deblocking, the part on the restriction dabber 1 only carries out axial displacement rather than circumferential direction, dabber 1 lower extreme design have sealed face again with deblocking sleeve 74, the leakproofness of dabber 1 internal diameter to liquid can be guaranteed in the cooperation of lower extreme joint 3.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The high-temperature high-pressure recoverable packer is characterized by comprising a mandrel, an upper end sealing assembly and a lower end connector which are arranged at the upper end and the lower end of the mandrel, and a sealing rubber cylinder assembly, a stopping anti-loosening assembly, a high-bearing anchoring slip assembly and a deblocking recovery assembly which are sequentially sleeved outside the mandrel from top to bottom, wherein the sealing rubber cylinder assembly, the stopping anti-loosening assembly, the high-bearing anchoring slip assembly and the deblocking recovery assembly are detachably connected;

sealed cartridge subassembly with the dabber junction is provided with the reducing step, sealed both ends of cartridge subassembly of gluing are equipped with the cover respectively and are located dabber upper end sleeve and component sheath, the upper end sleeve can be relative the dabber slides, and fixes through countersunk screw and first shear screw dabber spindle, the component sheath through set up in dabber upper end split ring joint, the upper end split ring with be provided with between the dabber and pass and press the hole, the upper end of dabber is provided with the upper end guide.

2. The high-temperature high-pressure recoverable packer according to claim 1, wherein the sealing rubber sleeve assembly comprises an upper end support ring, an upper end baffle ring, an upper end rubber sleeve element, a middle rubber sleeve element, a lower end baffle ring and a lower end support ring which are sleeved on the outer side of the mandrel from top to bottom in sequence.

3. The high-temperature high-pressure recoverable packer according to claim 1, wherein the backstop anti-loosening assembly comprises a piston cylinder, a piston, a snap ring sleeve, a shear ring, a connector and a lower-stop inner snap ring which are sequentially sleeved outside the mandrel from top to bottom;

one end of the piston cylinder is in threaded connection with the element sheath, and the connector is connected with the high load-bearing anchoring slip assembly;

one end of the piston extends into the piston cylinder, and the other end of the piston is abutted to the connector;

the inner side of one end of the connector is in threaded connection with the piston, and the other end of the connector is connected with the high-bearing anchoring slip assembly.

4. The high-temperature high-pressure recoverable packer according to claim 3, wherein piston stopping teeth are arranged on the outer side of the piston, inner and outer sides of the upper stop inner snap ring are respectively provided with inner diameter upper stopping teeth and outer diameter upper stopping teeth which are matched with the piston stopping teeth, sleeve stopping teeth which are matched with the outer diameter upper stopping teeth are arranged on the inner side of the snap ring sleeve, lower stopping teeth are arranged on the inner side of the lower stop inner snap ring, and mandrel stopping teeth which are matched with the lower stopping teeth are arranged on the outer side of the mandrel.

5. The recoverable packer of high temperature high pressure of claim 3, characterized in that, high bearing anchoring slips subassembly includes from last to locating in proper order down the upper end centrum, the lower extreme centrum and the joint in the dabber outside the upper end centrum with the tubbiness anchoring slips in the lower extreme centrum outside, tubbiness anchoring slips will the upper end centrum with the lower extreme centrum makes up integratively, the upper end centrum with the lower extreme centrum is fixed through two sets of second direction holding screw and first shear pin respectively the spindle.

6. The high-temperature high-pressure recoverable packer according to claim 5, wherein the parts of the outer sides of the barrel-shaped anchoring slips, which are close to the upper end cone and the lower end cone, are respectively provided with downward anchoring teeth and upper end non-full cutting grooves which are arranged in a staggered manner, and upward anchoring teeth and lower end non-full cutting grooves, the inner sides of the barrel-shaped anchoring slips are sequentially provided with small inclination angles, meshing grooves, double meshing grooves and double small inclination angles from top to bottom, the outer sides of the upper end cones are provided with double meshing steps corresponding to the meshing grooves, and the outer sides of the lower end cones are provided with triple meshing steps corresponding to the double meshing grooves.

7. The high-temperature high-pressure recoverable packer according to claim 5, wherein the deblocking recovery assembly comprises a shaft sleeve, a shearing sleeve, a buckling ring and a deblocking sleeve which are sequentially sleeved outside the mandrel from top to bottom, one end of the shaft sleeve is connected with the outer side of the lower end cone in a threaded mode, the other end of the inner side of the shaft sleeve is located through a lower end opening ring arranged on the outer side of the mandrel, two ends of the shearing sleeve are respectively connected with the shaft sleeve and the lower end connector in a threaded mode, and the shearing sleeve and the deblocking sleeve both extend towards the outside of the mandrel and are connected with the lower end connectors respectively;

the deblocking sleeve is located it is inboard to cut the sleeve, its both ends respectively with the axle sleeve with lower end joint threaded connection, the deblocking sleeve with cut and connect through third shear screw between the sleeve, the deblocking sleeve stretches out the inboard of dabber part is provided with location shrink step and buckle step, the location shrink step with the adjacent setting of buckle step.

8. The high-temperature high-pressure recoverable packer according to claim 7, wherein a deblocking groove is formed at the joint of the deblocking sleeve and the snap ring, and a sealing surface opposite to the deblocking groove is formed on the outer side of the mandrel.

9. The recoverable packer of claim 7, further comprising a deblocking recovery tool, wherein the deblocking recovery tool comprises a body, and a pawl, a spring sleeve and a lug which are sequentially arranged on the outer side of the body along the axial direction of the body, the pawl is movably sleeved on the outer side of the body and fixed on the body through a top shearing pin, the spring sleeve is fixed on the body through a release shearing pin, and a clamping step capable of being buckled with the buckling step is arranged on the lug.

10. The high temperature and high pressure retrievable packer of claim 1, wherein the upper end sealing assembly comprises an upper end sleeve disposed on top of the mandrel, left hand threads disposed on an inside of the upper end sleeve from top to bottom, a first stop step and a second stop step, a sealing element sealing the upper end sleeve.