CN219492263U - Easily-recovered hanging packer - Google Patents

Abstract

The utility model discloses an easily recovered suspended packer, which comprises: the central tube, the anchoring slip assembly, the piston assembly, the rubber cylinder assembly, the deblocking assembly and the C-shaped ring are sequentially sleeved outside the central tube from top to bottom; the outer wall of the central tube is sequentially provided with a fixed hole, an annular groove, a unsealing hole and an annular mounting groove from top to bottom, the annular groove is provided with a pressure transmission through hole, one end of the anchoring slip assembly is fixed in the fixed hole, the piston assembly is sleeved in the annular groove and communicated with the pressure transmission through hole, two ends of the piston assembly are respectively connected with the anchoring slip assembly and the rubber cylinder assembly in a threaded manner, the unsealing assembly is fixedly connected with the unsealing hole and is abutted to the rubber cylinder assembly, and the C-shaped ring is mounted in the C-shaped ring mounting groove. In the embodiment, the anchoring slip assembly is arranged above the rubber sleeve assembly, so that the underground upward pushing force born by the deblocking assembly is dispersed to a great extent, the automatic deblocking of the packer caused by the upward pushing force is prevented without excessive deblocking force, the deblocking force is reduced so that the packer is deblocked, and the requirement and the cost of the underground working equipment are reduced.

Description

Easily-recovered hanging packer

Technical Field

The utility model relates to the technical field of oil and gas field well completion tools, in particular to an easily-recovered suspended packer.

Background

In recent years, with the deep development of offshore or land oil and gas fields, multi-point exploitation and large-area derrick laying have become future trends, so that the application of completion tools has also shown explosive growth, while a recovery packer is one of conventional and commonly applied completion exploitation tools, and the super tensile strength and riveting capability of the recovery packer play a critical role in the whole tool string, so that the recovery packer is a foundation for ensuring normal underground operation.

In most recovery type suspended packers, a manner that a packing element is arranged above and a slip is arranged below is generally adopted, when a large pressure difference exists at the bottom of a well, annular upper jacking force acts on a central tube, upper jacking force born by the central tube acts on recovery shear and pins arranged on the central tube and an unsealing part, and the recovery shear pins are easily cut off by the excessive upper jacking force, so that the packer is automatically unsealed, and the risk of automatic unsealing of the packer caused by the excessive upper jacking force at the bottom of the well is avoided, but the unsealing recovery of the subsequent packer is not facilitated by the excessive unsealing force.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides an easily-recovered hanging packer, which comprises the following components: the central tube, the anchoring slip assembly, the piston assembly, the rubber cylinder assembly, the deblocking assembly and the C-shaped ring are sequentially sleeved outside the central tube from top to bottom;

the outer wall of the central tube is sequentially provided with a fixed hole, an annular groove, a unsealing hole and an annular mounting groove from top to bottom, a pressure transmission through hole is formed in the annular groove, one end of the anchoring slip assembly is fixedly connected with the fixed hole, the piston assembly is sleeved outside the annular groove and is communicated with the pressure transmission through hole, two ends of the piston assembly are respectively connected with the other end of the anchoring slip assembly and one end of the rubber cylinder assembly in a threaded manner, the unsealing assembly is fixedly connected with the unsealing hole and is abutted to the other end of the rubber cylinder assembly, and the C-shaped ring is fixedly mounted in the C-shaped ring mounting groove.

According to one embodiment of the utility model, the central tube is further provided with perforations, which penetrate through both ends of the central tube and are arranged adjacent to the central tube.

According to one embodiment of the utility model, the anchoring slip assembly comprises an upper slip cone, a slip assembly and a lower slip cone which are arranged on the central tube from top to bottom, wherein the upper slip cone and the lower slip cone are oppositely arranged, two ends of the slip assembly are respectively abutted against the upper slip cone and the lower slip cone, the upper slip cone is fixedly connected with the fixing hole, and the lower slip cone is in threaded connection with the piston assembly.

According to one embodiment of the utility model, the slip assembly comprises a slip, an elastic sheet and a slip cage, wherein anchoring teeth are arranged at two ends of the slip, a plurality of groups of openings are axially formed in the slip cage, each group of openings is provided with at least two openings, the at least two openings are sequentially arranged along the axial direction of the slip cage, the slip cage is sleeved outside the slip, the anchoring teeth are exposed out of the slip, the elastic sheet is positioned between the slip cage and the slip, one surface of the elastic sheet is abutted against the outer wall between the anchoring teeth at the two ends of the slip, and the other surface of the elastic sheet is abutted against the inner wall of the slip cage.

According to one embodiment of the utility model, the piston assembly comprises a separating ring, a piston cylinder and an anti-reversing structure, wherein the separating ring is sleeved in the annular groove, a plurality of overpressure openings are formed in the separating ring along the circumferential direction of the separating ring, the piston cylinder sleeve is arranged outside the separating ring, one end of the piston cylinder sleeve is in threaded connection with the rubber cylinder assembly, one end of the piston is positioned in the piston cylinder and is close to the separating ring, the other end of the piston is in threaded connection with the lower cone of the slip, and the anti-reversing structure is arranged between the piston cylinder and the lower cone and is connected with the piston and the piston cylinder.

According to one embodiment of the utility model, the anti-reversing structure comprises a shearing ring and an inner clamping shoe assembly, wherein the shearing ring is arranged at one end of the piston close to the lower cone body and is fixedly connected with the piston through a shearing pin, the inner clamping shoe assembly is arranged between the shearing ring and the piston cylinder, and two ends of the inner clamping shoe assembly are respectively connected with the shearing ring and the piston cylinder in a threaded manner.

According to one embodiment of the utility model, the inner clamping tile assembly comprises an inner clamping tile and an inner clamping tile sheath, two ends of the inner clamping tile sheath are respectively connected with the shearing ring and the piston cylinder in a threaded manner, the inner wall of the inner clamping tile is provided with a first clamping tooth, the inner clamping tile is arranged between the piston and the inner clamping tile sheath, the outer wall of the inner clamping tile is provided with a second clamping tooth, the first clamping tooth is meshed with the second clamping tooth, the inner wall of the inner clamping tile and the outer wall of the piston are both provided with anti-reversing fine teeth, and the inner clamping tile and the piston move in a one-way relative manner through the anti-reversing fine teeth.

According to one embodiment of the utility model, the rubber cylinder assembly comprises a rubber cylinder supporting sleeve, an upper rubber cylinder, a rubber cylinder partition ring and a lower rubber cylinder which are sequentially sleeved outside the central tube from top to bottom, one end of the rubber cylinder supporting sleeve is close to the partition ring and is in threaded connection with the piston cylinder, two ends of the upper rubber cylinder are respectively abutted against the rubber cylinder supporting sleeve and the rubber cylinder partition ring, and the lower rubber cylinder is respectively abutted against the deblocking assembly and the rubber cylinder partition ring.

According to one embodiment of the utility model, the rubber cylinder assembly further comprises a back ring, wherein the multi-layer back rings are embedded at one ends of the upper rubber cylinder and the lower rubber cylinder, which are far away from the rubber cylinder partition ring, one ends of the back rings are in a petal shape, and one ends of the back rings are in a petal shape and face the rubber cylinder partition ring.

According to one embodiment of the utility model, the unsealing assembly comprises an unsealing ring, the unsealing ring is sleeved outside the central tube, a plurality of unsealing through holes are circumferentially arranged on the unsealing ring, the unsealing through holes are opposite to the unsealing holes, the unsealing through holes are connected with the unsealing holes through shear pins, and the unsealing ring is abutted against the rubber cylinder assembly.

According to the utility model, the anchoring slip assembly is arranged above the rubber sleeve assembly, when the underground pressure is excessive and the packer is jacked, the anchoring slip assembly is fixedly connected with the central pipe, and the jacking force is borne by the upper anchoring slip assembly, so that the jacking force borne by the deblocking assembly is greatly reduced, the risk of self deblocking of the packer caused by the jacking force is prevented without excessive deblocking force, namely, the deblocking force is reduced, the deblocking of the packer is facilitated, and the requirement and cost of the working equipment on the well are reduced.

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 embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of a central tube structure in an embodiment;

FIG. 2 is a schematic diagram of a packer in an embodiment;

FIG. 3 is a schematic illustration of the structure of a packer removal slip cage and piston cylinder in an embodiment;

FIG. 4 is a longitudinal cross-sectional view of a packer in an embodiment;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a schematic view of the mating structure of the upper and lower slips in an embodiment;

FIG. 7 is an enlarged view of part C of the embodiment;

FIG. 8 is an enlarged view of portion B of FIG. 4;

FIG. 9 is an enlarged view of the portion E of FIG. 8;

FIG. 10 is a cross-sectional view a-a of FIG. 3;

FIG. 11 is a schematic view of an inner tile jacket and an inner tile structure according to an embodiment;

FIG. 12 is an enlarged view of portion D of FIG. 4;

FIG. 13 is a schematic view of a back ring structure according to an embodiment;

fig. 14 is a cross-sectional view taken along line b-b in fig. 3.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the utility model solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1-4, fig. 1 is a schematic diagram of a central pipe structure in an embodiment, fig. 2 is a schematic diagram of a packer in a three-dimensional structure in an embodiment, fig. 3 is a schematic diagram of a structure of a slip cage and a piston cylinder of a packer in an embodiment, and fig. 4 is a longitudinal section view of the packer in an embodiment. In this case, an easily retrieve hang packer, including center tube 1, from top to bottom overlaps anchor slips subassembly 2 outside center tube 1 in proper order, piston subassembly 3, packing element subassembly 4, deblocking subassembly 5 and C shape ring 6, center tube 1 outer wall is equipped with fixed orifices 11 from top to bottom in proper order, annular groove 12, deblocking hole 13 and C shape ring mounting groove 14, be equipped with the biography pressure through hole 121 in the annular groove 12, anchor slips subassembly 2 passes through fixed orifices 11 and center tube 1 fixed connection, piston subassembly 3 cover is located outside annular groove 12 and with biography pressure through hole 121 intercommunication, piston subassembly 3 both ends threaded connection is in anchor slips subassembly 2's the other end and packing element subassembly 4's one end respectively, deblocking subassembly 5 is through riveting shear pin 02 in order to connect deblocking subassembly 5 and deblocking hole 13, realize deblocking subassembly 5 and center tube 1's fixed, simultaneously, deblocking subassembly still butt packing element 4's the other end, C shape ring 6 is fixed mounting in C shape ring mounting groove 14.

When setting, the upper end and the lower end of the central tube 1 are connected with an oil pipe and a tool string to form an oil gas pipe column, the oil gas pipe column is pressurized, pressure enters the pressure transmission hole 121 through the central tube 1, the piston assembly 3 simultaneously extrudes the anchoring slip assembly 2 and the rubber sleeve assembly 4, the anchoring slip assembly 2 and the rubber sleeve assembly 4 respectively independently move and expand, the anchoring slip assembly 2 is meshed with the inner wall of the pipe column, and meanwhile the rubber sleeve assembly 4 also abuts against the inner wall of the pipe column, so that setting is completed.

During deblocking, the oil pipe and the tool string are lifted upwards to pull the central pipe 1 upwards, under the action of pulling force, the shearing pin 02 connected to the deblocking assembly 5 and the central pipe 1 is sheared, so that the deblocking assembly 5 loses supporting force and slides downwards to the C-shaped ring 6 along the central pipe 1, at the moment, the C-shaped ring 6 supports the deblocking assembly 5 to prevent the deblocking assembly 5 from falling, and the anchoring slip assembly 2 and the rubber cylinder assembly 4 shrink due to the loss of the supporting force of the deblocking assembly 5, and meanwhile, the anchoring slip assembly 2, the piston assembly 3 and the rubber cylinder assembly 4 slide downwards together with the deblocking assembly 5, so that deblocking is completed.

Because the anchoring slip component 2 is arranged above the rubber sleeve component 4, when the pressure in the pit is overlarge and the packer is jacked, because the anchoring slip component 2 is fixedly connected with the central pipe 1, the jacking force is borne by the anchoring slip component 2 at the upper end, so that the jacking force borne by the deblocking component 5 is reduced, the risk of self deblocking of the packer caused by the jacking force is avoided without the overlarge deblocking force, namely, the deblocking force is reduced, the deblocking of the packer is facilitated, meanwhile, because the anchoring slip component 2 and the rubber sleeve component 4 are respectively arranged at the two ends of the piston component 3, the respective setting forces are not additionally consumed due to the characteristic of independent movement during setting, the setting of the packer can be completed by the smaller setting forces, namely, the requirement of external setting equipment is reduced, and the application cost of the equipment is reduced.

Turning to fig. 1 and 4. Further, the central tube 1 is further provided with perforations 15, the perforations 15 penetrate through two ends of the central tube 1 and are adjacently arranged with the central tube 1 pipeline, so that a dual-channel packer is formed, when the packer is set in a tubular column, an optical fiber cable can be inserted into the perforations 15 to be connected with a pressure gauge or a thermometer in the pit so as to detect the pressure or the temperature in the pit, or chemical preservative is injected through the perforations 15, so that the annular operation sleeve is subjected to corrosion protection, and the practicability of the product is further improved.

Referring to fig. 5-6, turning to fig. 1-4, fig. 5 is an enlarged view of a portion a of fig. 4, and fig. 6 is a schematic view of a slip upper cone, a slip and a slip lower cone mating structure according to an embodiment. Further, the rivet slip assembly 2 sequentially comprises a slip upper cone 21, a slip assembly 22 and a slip lower cone 23 from top to bottom along the central tube 1, the slip upper cone 21 and the slip lower cone 23 are oppositely arranged, two ends of the slip assembly 22 are respectively abutted to one ends of the slip cone and the slip lower cone 23, the other end of the slip upper cone 21 is fixedly connected with the fixing hole 11, and the slip lower cone 23 is in threaded connection with the piston assembly 3.

Specifically, the upper and lower slip cones 21, 23 each have a tapered surface 10, and the tapered surface 10 of the upper slip cone 21 opposes the tapered surface 10 of the lower slip cone 23, and upon setting, the two tapered surfaces 10 co-squeeze the slip assembly 22 such that the slip assembly 22 expands to anchor against the inner wall of the pipe string.

Specifically, the slip assembly 22 includes a slip 221, an elastic piece 222 and a slip cage 223, the slip 221 is sleeved on the outer wall of the central tube 11 and is located between the slip upper cone 21 and the slip lower cone 23, two ends of the slip 221 are provided with anchoring teeth 2211, the slip cage 223 is circumferentially provided with a plurality of groups of openings 2231, each group of openings 2231 is provided with at least two openings, the two openings are sequentially arranged along the axial direction of the slip cage 223, the slip cage 223 is sleeved outside the slip 221, the anchoring teeth 2211 are exposed out of the openings 2231, the elastic piece 222 is located between the slip cage 223 and the slip 221, the elastic piece 222 is respectively abutted against the inner wall between the openings on the slip cage 223 and the outer wall between the anchoring teeth 2211 on the slip 221, specifically, in the slip cage 223, the elastic piece 222 is abutted against the two openings of each group of openings 2231. Before the packer is set down in the pipe string, the elastic pieces 222 are abutted against the slips 221, so that the clamping teeth 2211 at the two ends of the slips 221 are positioned in the openings 2231, and the packer can be more smoothly put into the pipe string. Preferably, in this example, the anchoring teeth 2211 at two ends of the slips 221 are in bidirectional tooth shape, that is, the anchoring teeth 2211 at two ends of the slips 211 face the center line c-c respectively, and the anchoring teeth 2211 at two ends of the slips 221 also incline towards the direction opposite to the center pipe 1, so that the packer can bear the load of pushing up or down when setting, and the elastic sheets 222 are metal elastic sheets.

Further, one surface of two ends of the slip 221, which is opposite to the anchoring teeth 2211, is provided with extrusion inclined surfaces 2212, when the slip is installed, the extrusion inclined surfaces 2212 of two ends of the slip 221 are respectively attached to the conical surfaces 10 of the upper cone 21 and the lower cone 23 of the slip, and when the slip is set, the conical surfaces 10 of the upper cone 21 and the lower cone 23 of the slip jointly extrude the extrusion inclined surfaces 2212 of two ends of the slip 221, so that the slip 221 radially expands and compresses the elastic sheets 222, and meanwhile, the anchoring teeth 2211 of two ends of the slip 221 are ejected out of the opening 2231 and are engaged with the inner wall of the pipe column.

Referring to fig. 7, and again to fig. 1-4, fig. 7 is an enlarged view of portion C in the embodiment. Further, the piston assembly 3 includes a spacer ring 31, a piston 32, a piston cylinder 33 and an anti-reversing structure 34, the spacer ring 31 is sleeved on the annular groove 12, a plurality of overpressure openings 311 are circumferentially arranged on the spacer ring 31, a first piston cavity 122 is formed between the inner wall of the spacer ring 31 and the bottom of the annular groove 12, the piston cylinder 33 is sleeved outside the spacer ring 31, a second piston cavity 123 is formed between the outer wall of the spacer ring 31 and the inner wall of the piston cylinder 33, the overpressure holes 121 are communicated with the first piston cavity 122, the second piston cavity 123 is communicated with the first piston cavity 122 through the overpressure openings 311, one end of the piston cylinder 33 is in threaded connection with the rubber cylinder assembly 4, one end of the piston 32 is located in the piston cylinder 33 and is close to the spacer ring 31, the other end of the piston 32 is in threaded connection with the lower cone 23, and the anti-reversing structure 34 is arranged between the piston cylinder 33 and the lower cone 23 and is connected with the piston 32 and the piston cylinder 33.

When setting, the pressure firstly enters and fills the first piston cavity 122 from the pipeline of the central pipe 1 through the pressure transmission hole 121, then enters the second piston cavity 123 through the plurality of overpressure openings 311, pushes the piston assembly 3 and the rubber cylinder assembly 4 in different directions in the second piston cavity 123, and in the piston assembly 3, the piston 32 moves upwards under the pushing of the pressure in the first piston cavity 123, so that the piston 32 presses the lower cone 23 of the slip, so that the lower cone 23 of the slip moves upwards and pushes the slip 22 to move upwards, at the moment, the conical surfaces 10 of the upper cone 21 and the lower cone 23 of the slip jointly squeeze the extrusion inclined surfaces at two ends of the slip 22, so that the slips 221 radially expand and compress the elastic sheets 222, and simultaneously, the anchoring teeth 2211 at two ends of the slips 221 are ejected out of the openings 2231 and are meshed with the inner wall of the pipe column. In the rubber cylinder assembly 4, since the piston cylinder 33 is in threaded connection with the rubber cylinder assembly 4, the rubber cylinder assembly 4 moves downwards under the pressure action of the second piston cavity 123, and at this time, the rubber cylinder assembly 4 pulls the piston cylinder 33 to move downwards together, so that the piston cylinder 33 pulls the anti-reversing structure 34 to move downwards, the anti-reversing structure 34 limits the piston 32 and the piston cylinder 33, and the sealing effect cannot be achieved due to slip or rubber cylinder rebound after pressure relief.

Preferably, the end of the piston 32 located within the piston cylinder 33 is sealed with a sealing ring.

Referring to fig. 8-11, turning to fig. 1-4, fig. 8 is an enlarged view of a portion B of fig. 4, fig. 9 is an enlarged view of a portion E of fig. 8, fig. 10 is a cross-sectional view a-a of fig. 3, and fig. 11 is a schematic view of an inner tile sheath and an inner tile structure according to an embodiment. Further, the anti-reversing structure 34 includes a shear ring 341 and an inner clamping shoe assembly 342, the shear ring 341 is disposed at one end of the piston 32 near the lower cone 23, the shear ring 341 is fixedly connected with the piston 32 through a shear pin and a setting shear pin 01, the inner clamping shoe assembly 34 is disposed between the shear ring 341 and the piston cylinder 33, and two ends of the inner clamping shoe assembly 34 are respectively in threaded connection with the shear ring 341 and the piston cylinder 33.

Further, the inner shoe assembly 342 includes an inner shoe 3421 and an inner shoe sheath 3422, two ends of the inner shoe sheath 3422 are respectively connected with the shear ring 341 and the piston cylinder 33 by screw threads, a first latch 34221 is provided on the inner wall of the inner shoe sheath 3422, the inner shoe 3421 is disposed between the piston 32 and the inner shoe sheath 3422, a second latch 34211 is provided on the outer wall of the inner shoe 3421, the first latch 34221 is engaged with the second latch 34211, and anti-reversing serrations 20 are provided on the inner wall of the inner shoe 3421 and the outer wall of the piston 32. When the second piston chamber 123 is set, when the pressure in the second piston chamber 123 pushes the piston 32 and the rubber component 4 respectively, the piston 32 and the rubber component 4 move in opposite directions respectively, meanwhile, under the traction of the rubber component 4, the piston cylinder 33 drives the inner slip jacket 3422 to move, the inner slip jacket 3422 drives the shear ring 341 to move, so that the setting shear screw 01 connecting the shear ring 341 and the piston 32 is sheared, meanwhile, the inner slip jacket 3422 also drives the inner slip 3421 to move relative to the piston 32, and in the moving process, the anti-reversing serrations 20 on the inner wall of the inner slip 3421 and the outer wall of the piston 32 are unidirectional, so that the anti-reversing serrations 20 on the inner slip 3421 and the piston 32 are mutually meshed in the moving process, so that the inner slip 3421 and the piston 32 cannot perform opposite relative movement, and further, the slip or the rubber can be prevented from rebounding to achieve the sealing effect after pressure relief. Preferably, the inner shoe assembly 342 is mounted by staking an anti-rotation pin 03 to connect the inner shoe 3421 and the inner shoe sheath 3422 to prevent relative rotation between the inner shoe 3421 and the inner shoe sheath 3422.

Referring to fig. 12-13, referring back to fig. 1-4, fig. 12 is an enlarged view of a portion D in fig. 4, and fig. 13 is a schematic view of a back ring structure in an embodiment. Further, the rubber component 4 includes a rubber supporting sleeve 41, an upper rubber 42, a rubber spacer 43 and a lower rubber 44 sequentially from top to bottom along the central tube 1, one end of the rubber supporting sleeve 41 is located in the piston cylinder 33 and is in threaded connection with the piston cylinder 33, two ends of the upper rubber 42 are respectively abutted against the rubber supporting sleeve 41 and the rubber spacer 43, and the lower rubber 44 is respectively abutted against the deblocking component 5 and the rubber spacer 43. Under the pushing of the pressure in the second piston cavity 123, the rubber cylinder supporting sleeve 41 extrudes the upper rubber cylinder 42, so that the upper rubber cylinder 42 extrudes downwards, and the deblocking assembly 5 is in a fixed state, so that the upper rubber cylinder 42, the rubber cylinder spacing ring 43 and the lower rubber cylinder 44 extrude each other, and the upper rubber cylinder 42 and the lower rubber cylinder 44 expand radially to realize packing.

Preferably, the end of the packing support sleeve 41 located in the piston cylinder 33 is also sealed with a sealing ring.

Preferably, the rubber cylinder assembly 4 further comprises a back ring 45, wherein the multi-layer back ring 45 is inlaid at one end, far away from the rubber cylinder spacer 43, of each of the upper rubber cylinder 42 and the lower rubber cylinder 44, one end of the back ring 45 is in a petal shape, one end of the back ring 45 in the petal shape faces the rubber cylinder spacer 43, and the petal-shaped structures of the multi-layer back ring 45 are staggered with each other. Through adopting inlay back of body circle 45 to the inside of last packing element 41 and lower packing element 44, when the packer goes into the well, the outside of last packing element 42 and lower packing element 44 does not have unnecessary retaining ring or back of body circle, still can pass through smoothly when the packer runs into the pit shaft that impurity is more, when setting, go up packing element 42 and lower packing element 44 and receive the extrusion and expand, because back of body circle 45 one end is the petal form, inlay the inside back of body circle 45 of last packing element 42 and lower packing element 44 then can be strutted to coat respectively and go up packing element 42 and lower packing element 44, make last packing element 42 and lower packing element 44 seal time longer when receiving high temperature high pressure, in order to further improve the reliability of packing.

Referring to fig. 14, fig. 14 is a cross-sectional view taken along line b-b of fig. 3. Further, the deblocking assembly 5 comprises a deblocking ring 51, the deblocking ring 51 is sleeved outside the central tube 1, a plurality of deblocking through holes 511 are uniformly formed along the circumferential direction of the deblocking ring 51, the plurality of deblocking through holes 511 are opposite to the deblocking holes 13, and the deblocking through holes 511 and the deblocking holes 13 are connected by riveting a deblocking shearing pin 02 during installation to fix the deblocking ring 51.

In the deblocking process, the oil pipe lifting tool string is lifted, and the deblocking shearing pin 02 connecting the deblocking through hole 511 and the deblocking hole 13 is sheared. At this time, the deblocking ring 51 slides down to the C-shaped ring 6 on the central tube 1 and is carried by the C-shaped ring 6, the packing element assembly 4 loses the support of the deblocking ring 51, starts to shrink and slides down together with the deblocking ring 51, and the parts mounted on the central tube, because the slip upper cone 21 is fixed on the central tube 1 through the fixing hole 11, the separation ring 31 is fixed on the central tube 1 through the annular groove 12, except the separation ring 31 and the slip upper cone 21, all the rest slide down along with the lifting of the central tube 1, the upper packing element 42, the lower packing element 44 and the slips 221 shrink to the original state, and the packer realizes deblocking and lifting the wellhead. Because the anchoring slip assembly 2 is arranged above the rubber sleeve assembly 4, when the packer is jacked up due to excessive underground pressure, the jacked-up force is borne by the anchoring slip assembly 2 at the upper end and does not act on the central tube 1, so that shear nails for connecting the deblocking through hole 511 and the deblocking hole 13 can be reduced, the deblocking force is reduced, and the packer is convenient to deblock.

In summary, when setting, the upper and lower ends of the packer are connected with oil pipes and tool strings to form an oil and gas pipe column. And pressurizing the pipe column, and sequentially transmitting the pressure to the first piston cavity and the second piston cavity through pressure transmission holes on the central pipe. When the pressure reaches a certain value, the setting shear pin connecting the shear ring and the piston is sheared, the piston moves upwards, the rubber sleeve support sleeve moves downwards, the piston continues to move and pushes the lower cone of the slip connected to the piston, so that the slip is pushed to expand radially and simultaneously push the slip cage to move, at the moment, the slip extrusion inclined plane is tightly attached to the conical surfaces of the upper cone and the lower cone of the slip, and the clamping teeth bite the pipe column to realize anchoring.

Because the central tube pressure transmission hole is between the slip assembly and the rubber cylinder assembly, the upper rubber cylinder and the lower rubber cylinder are set while the slips are set. When the rubber cylinder supporting sleeve moves downwards, the piston cylinder, the inner clamping shoe sheath, the inner slips and the shearing ring are driven to move rightwards, after the minimum setting pressure is reached, the upper rubber cylinder and the lower rubber cylinder are extruded and expanded, so that the sealing sleeve is sleeved, and the back rings embedded into the upper rubber cylinder and the lower rubber cylinder are also expanded along with the extrusion expansion of the upper rubber cylinder and the lower rubber cylinder, so that the rubber cylinder is protected. Because the piston on the packer and the inner slips are relatively moved in the setting process, after setting is completed, the anti-reversing fine teeth on the inner slips are engaged with the anti-reversing fine teeth on the piston in a staggered manner, after setting pressure relief is completed, the upper rubber cylinder and the lower rubber cylinder cannot rebound, and the problem that the rubber cylinder rebounds after pressure relief and cannot play a role in packing is avoided, so that permanent setting is formed. After the packer is set, the packer can be connected with a downhole pressure gauge and a downhole thermometer through a perforation-down optical fiber cable so as to detect the downhole pressure or temperature, or chemical preservative is injected into the perforation to protect the casing.

When in deblocking, an oil pipe lifting tool string is lifted, and a deblocking shearing pin connected with a deblocking through hole and a deblocking hole is sheared. At this time, the deblocking ring slides to the C-shaped ring on the central tube and is borne by the C-shaped ring, the rubber barrel component loses the support of the deblocking ring, starts to shrink and slides along with the deblocking ring, parts mounted on the central tube, except the separation ring and the upper cone of the slips, all the rest slide along with the lifting of the central tube, the upper rubber barrel, the lower rubber barrel and the slips shrink to the original state, and the packer realizes deblocking and lifts the wellhead.

In this case, through setting up the anchoring slips subassembly in packing element subassembly top, when the pressure is too big in the pit, when propping up the packer, because anchoring slips subassembly and center tube fixed connection, upward the jacking force is born by the anchoring slips subassembly of upper end, greatly reduce the jacking force that the deblocking subassembly bore, consequently, the risk of packer self-deblocking that the jacking force caused is prevented to the deblocking force of need not too big, realize reducing the deblocking force promptly, the packer deblocking of being convenient for, thereby reduce the requirement and the cost of uphole working equipment.

The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.

Claims (10)

1. An easily recoverable suspended packer comprising: the central tube, the anchoring slip assembly, the piston assembly, the rubber cylinder assembly, the deblocking assembly and the C-shaped ring are sequentially sleeved outside the central tube from top to bottom;

the utility model discloses a connecting rod for a C-shaped ring installation groove, including the center tube outer wall, the center tube outer wall is equipped with fixed orifices, annular groove, hole-releasing and annular mounting groove from top to bottom in proper order, be equipped with the pressure-transmitting through hole in the annular groove, anchor slips subassembly one end with fixed orifices fixed connection, the piston subassembly cover is located outside the annular groove and with the pressure-transmitting through hole intercommunication, its both ends respectively threaded connection in anchor slips subassembly other end and rubber cylinder subassembly one end, the hole-releasing subassembly with hole-releasing hole-sealing fixed connection and butt the rubber cylinder subassembly other end, C-shaped ring fixed mounting in C-shaped ring mounting groove.

2. The retrievable suspended packer of claim 1, wherein the base pipe is further provided with perforations extending through both ends of the base pipe and disposed adjacent to the base pipe conduit.

3. The easily-recovered suspended packer of claim 1, wherein the anchoring slip assembly comprises an upper slip cone, a slip assembly and a lower slip cone which are arranged on the central tube from top to bottom, the upper slip cone and the lower slip cone are oppositely arranged, two ends of the slip assembly are respectively abutted to the upper slip cone and the lower slip cone, the upper slip cone is fixedly connected with the fixing hole, and the lower slip cone is in threaded connection with the piston assembly.

4. The easily-recovered suspended packer of claim 3, wherein the slip assembly comprises a slip, an elastic sheet and a slip cage, wherein anchoring teeth are arranged at two ends of the slip, a plurality of groups of openings are axially formed in the slip cage, each group of openings is provided with at least two openings, the at least two openings are sequentially arranged along the axial direction of the slip cage, the slip cage is sleeved outside the slip, the anchoring teeth are exposed out of the openings, the elastic sheet is positioned between the slip cage and the slip, one surface of the elastic sheet is abutted against the outer wall between the anchoring teeth at two ends of the slip, and the other surface of the elastic sheet is abutted against the inner wall of the slip cage.

5. The easily recoverable suspended packer of claim 3, wherein the piston assembly comprises a spacer ring, a piston cylinder and an anti-backup structure, the spacer ring is sleeved in the annular groove, the spacer ring is provided with a plurality of overpressure openings along the circumferential direction thereof, the piston cylinder sleeve is arranged outside the spacer ring, one end of the piston cylinder sleeve is in threaded connection with the packing element assembly, one end of the piston is positioned in the piston cylinder and is close to the spacer ring, the other end of the piston is in threaded connection with the lower cone of the slips, and the anti-backup structure is arranged between the piston cylinder and the lower cone and is connected with the piston and the piston cylinder.

6. The retrievable suspended packer of claim 5, wherein the anti-backup structure comprises a shear ring and an inner shoe assembly, the shear ring being disposed at an end of the piston adjacent the lower cone and fixedly connected to the piston by a shear pin, the inner shoe assembly being disposed between the shear ring and the piston cylinder, and having two ends threadably connected to the shear ring and the piston cylinder, respectively.

7. The easily recoverable suspended packer of claim 6, wherein the inner shoe assembly comprises an inner shoe and an inner shoe sheath, wherein the two ends of the inner shoe sheath are respectively in threaded connection with the shear ring and the piston cylinder, the inner wall of the inner shoe sheath is provided with a first latch, the inner shoe is arranged between the piston and the inner shoe sheath, the outer wall of the inner shoe sheath is provided with a second latch, the first latch is engaged with the second latch, and the inner shoe inner wall and the piston outer wall are both provided with anti-reversing serrations, and the inner shoe and the piston move unidirectionally and relatively through the anti-reversing serrations.

8. The easily-recovered suspended packer according to claim 6, wherein the rubber sleeve assembly comprises a rubber sleeve supporting sleeve, an upper rubber sleeve, a rubber sleeve partition ring and a lower rubber sleeve which are sequentially sleeved outside the central tube from top to bottom, one end of the rubber sleeve supporting sleeve is close to the partition ring and is in threaded connection with the piston cylinder, two ends of the upper rubber sleeve are respectively abutted against the rubber sleeve supporting sleeve and the rubber sleeve partition ring, and the lower rubber sleeve is respectively abutted against the deblocking assembly and the rubber sleeve partition ring.

9. The easily recyclable suspended packer of claim 8, wherein the packing element assembly further comprises a backing ring, wherein the multi-layer backing rings are embedded in the upper packing element and the lower packing element at the ends far away from the packing element spacer ring, one of the backing rings is in a petal shape, and the other end of the backing ring is in a petal shape and faces the packing element spacer ring.

10. The easily recoverable suspended packer of claim 1, wherein the unsealing assembly comprises an unsealing ring, the unsealing ring is sleeved outside the central tube, a plurality of unsealing through holes are circumferentially arranged, the unsealing through holes are opposite to the unsealing holes, the unsealing through holes are connected with the unsealing holes through shear pins, and the unsealing ring is abutted against the packing element assembly.