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

An Easy-to-Recover Suspension Packer

technical field

The utility model relates to the technical field of well completion tools in oil and gas fields, in particular to an easily recoverable suspension packer.

Background technique

In recent years, with the in-depth development of offshore or onshore oil and gas fields, multi-point exploitation and large-area derrick drilling and production of crude oil have become the future trend, so the application of well completion tools has also shown explosive growth, and the recovery packer is One of the conventional and widely used well completion and production tools, its super tensile strength and riveting ability play a vital role in the entire tool string, and are the basis for ensuring normal downhole operations.

In most recovery suspension packers, the rubber tube is on the top and the slips are on the bottom. When there is a large pressure difference at the bottom of the well, the upper force of the annulus acts on the center pipe, and the center pipe bears The jacking force will act on the recovery shear pin installed on the center pipe and the unsealing part. Excessive jacking force will easily cut the recovery shear pin and cause the packer to unsealing by itself, so a larger unsealing is required. The sealing force is used to prevent the risk of the packer unsealing due to excessive top force on the bottom of the well, but excessive unsealing force is not conducive to the subsequent unsealing and recovery of the packer.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides an easy-to-recover suspension packer, including: a central pipe, an anchor slip assembly, a piston assembly, and a rubber cartridge assembly that are sleeved outside the central pipe from top to bottom. , Unsealing components and C-rings;

The outer wall of the central tube is provided with a fixing hole, an annular groove, an unsealing hole and an annular installation groove in sequence from top to bottom. There is a pressure transmission hole in the annular groove. One end of the anchor slip assembly is fixedly connected with the fixing hole, and the piston assembly It is sleeved outside the annular groove and communicated with the pressure transmission hole, and its two ends are threadedly connected to the other end of the anchor slip component and one end of the rubber tube component, and the unsealing component is fixedly connected to the unsealing hole and abuts the rubber tube component At the other end, the C-shaped ring is fixedly installed in the C-shaped ring installation groove.

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

According to one embodiment of the present invention, the anchoring slip assembly includes an upper slip body, a slip assembly, and a lower slip body arranged on the central tube from top to bottom, the upper slip body and the lower The two ends of the slip assembly are respectively abutted against the upper and lower vertebral bodies of the slips, the upper vertebral body of the slips is fixedly connected with the fixing hole, and the lower vertebral body of the slips is threadedly connected with the piston assembly.

According to one embodiment of the present invention, the slip assembly includes a slip, an elastic sheet and a slip cage, the two ends of the slip have anchoring teeth, and the slip cage is provided with multiple sets of openings along the axial direction, and each set of openings has at least Two ports, at least two ports are arranged in sequence along the slip cage axial direction, the slip cage is set outside the slip cage, the anchor teeth are exposed from the opening, the elastic piece is located between the slip cage and the slip cage, and one side of it is against the slip cage. The two ends of the slips are anchored to the outer wall between the teeth, and the other side abuts against the inner wall of the slip cage.

According to one embodiment of the utility model, the piston assembly includes a partition ring, a piston, a piston cylinder and an anti-backward structure, the partition ring is set in the annular groove, the partition ring is provided with a plurality of overpressure openings along its circumference, and the piston cylinder is sleeved in the Outside the partition ring, one end of it is threaded with the rubber cartridge assembly, one end of the piston is located in the piston cylinder and close to the partition ring, and the other end is threaded with the lower vertebral body of the slip, and the anti-backward structure is arranged between the piston cylinder and the lower vertebral body. And connected with piston and piston cylinder.

According to one embodiment of the utility model, the anti-backward structure includes a shearing ring and an inner slip assembly. The shearing ring is arranged at one end of the piston close to the lower vertebral body, and is fixedly connected to the piston through a shear pin. The inner slip assembly is provided Between the shearing ring and the piston cylinder, its two ends are threadedly connected with the shearing ring and the piston cylinder respectively.

According to an embodiment of the present utility model, the inner slip assembly includes an inner slip and an inner slip sheath, and the two ends of the inner slip sheath are respectively threadedly connected with the shearing ring and the piston cylinder, and the inner wall thereof has a first locking tooth, The inner slip is set between the piston and the inner slip sheath, and the outer wall is provided with a second locking tooth, the first locking tooth engages with the second locking tooth, and the inner slip and the outer wall of the piston are provided with anti-reverse fine teeth. The inner slip and the piston move relative to each other in one direction through the anti-reverse fine teeth.

According to one embodiment of the utility model, the rubber cartridge assembly includes a rubber cartridge support sleeve, an upper rubber cartridge, a rubber cartridge spacer and a lower rubber cartridge, which are sleeved outside the central tube from top to bottom, and one end of the rubber cartridge support sleeve is close to the partition The ring is threadedly connected with the piston cylinder, the two ends of the upper rubber tube abut against the rubber tube support sleeve and the rubber tube spacer ring respectively, and the lower rubber tube respectively touches the unsealing component and the rubber tube spacer ring.

According to an embodiment of the present utility model, the rubber cartridge assembly also includes a backing ring. The ends of the upper rubber tube and the lower rubber tube far away from the spacer ring of the rubber tube are inlaid with multi-layer backing rings. One end of the backing ring is petal-shaped, and the backing ring The petal-shaped end faces the spacer ring of the rubber cartridge.

According to an embodiment of the present utility model, the unsealing assembly includes an unsealing ring, which is sleeved outside the central tube, and a plurality of unsealing through holes are arranged in the circumferential direction, and the plurality of unsealing through holes are opposite to the unsealing holes. The through-sealed hole is connected to the unsealed hole by a shear pin, and the unsealed ring abuts against the rubber cartridge assembly.

The utility model arranges the anchoring slip assembly above the rubber cylinder assembly. When the downhole pressure is too high and the packer is pushed up, due to the anchoring slip assembly and the center The pipe is fixedly connected, and the jacking force is carried by the anchor slip assembly at the upper end, which greatly reduces the jacking force on the unsealing component, so there is no need for excessive unsealing force to prevent the packer from self-sufficiency caused by the jacking force. The risk of unsealing is to reduce the unsealing force and facilitate the unsealing of the packer, thereby reducing the requirements and costs of working equipment on the well.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is a schematic diagram of central tube structure in the embodiment;

Fig. 2 is the schematic diagram of the three-dimensional structure of the packer in the embodiment;

Fig. 3 is the structural representation of removing the slip cage and the piston cylinder of the packer in the embodiment;

Fig. 4 is a longitudinal sectional view of the packer in the embodiment;

Fig. 5 is an enlarged view of part A in Fig. 4;

Fig. 6 is a schematic diagram of the cooperative structure of the slip upper vertebral body, the slips and the slip lower vertebral body in the embodiment;

Figure 7 is an enlarged view of part C in the embodiment;

Fig. 8 is an enlarged view of part B in Fig. 4;

Fig. 9 is an enlarged view of part E in Fig. 8;

Figure 10 is a sectional view of a-a in Figure 3;

Fig. 11 is a schematic diagram of the structure of the inner slip sheath and the inner slip in the embodiment;

Figure 12 is an enlarged view of part D in Figure 4;

Fig. 13 is a schematic diagram of the structure of the back ring in the embodiment;

Fig. 14 is a sectional view along line b-b in Fig. 3 .

Detailed ways

A number of embodiments of the present invention will be disclosed in the following diagrams. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some well-known and commonly used structures and components will be shown in a simple schematic manner in the drawings.

In addition, in the present utility model, the descriptions involving "first", "second", etc. are only for the purpose of description, and do not refer to the meaning of sequence or sequence, nor are they used to limit the present utility model, which are only for the purpose of A distinction is made between components or operations described in the same technical terms, but should not be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

Referring to Figure 1-Figure 4, Figure 1 is a schematic diagram of the structure of the center pipe in the embodiment, Figure 2 is a schematic diagram of the three-dimensional structure of the packer in the embodiment, and Figure 3 is a structure in which the slip cage and piston cylinder are removed from the packer in the embodiment Schematic diagram, Fig. 4 is a longitudinal sectional view of the packer in the embodiment. In this example, an easily recoverable suspension packer includes a central pipe 1, an anchor slip assembly 2, a piston assembly 3, a rubber cartridge assembly 4, and an unsealing Component 5 and C-shaped ring 6, the outer wall of central tube 1 is provided with fixing hole 11, annular groove 12, unsealing hole 13 and C-shaped ring installation groove 14 in sequence from top to bottom, and annular groove 12 is provided with pressure transmission channel Hole 121, the anchor slip assembly 2 is fixedly connected with the center pipe 1 through the fixing hole 11, the piston assembly 3 is sleeved outside the annular groove 12 and communicated with the pressure transmission hole 121, and the two ends of the piston assembly 3 are threadedly connected to the anchor Fix the other end of the slip assembly 2 and one end of the rubber cartridge assembly 4, and the unsealing assembly 5 connects the unsealing assembly 5 and the unsealing hole 13 by riveting the shear pin 02 to realize the fixing of the unsealing assembly 5 and the central tube 1 , at the same time, the unsealing assembly also abuts against the other end of the rubber cartridge assembly 4 , and the C-ring 6 is fixedly installed in the C-ring installation groove 14 .

When setting, the upper and lower ends of the center pipe 1 are connected with oil pipes and tool strings to form an oil and gas pipe string, which is pressurized into the pipe string, and the pressure enters the pressure transmission hole 121 through the center pipe 1, so that the piston assembly 3 squeezes the anchor card at the same time The shoe component 2 and the rubber tube component 4 make the anchor slip component 2 and the rubber tube component 4 independently move and expand, so that the anchor slip component 2 bites on the inner wall of the pipe string, and the rubber tube component 4 also abuts the pipe string The inner wall, ie complete setting.

When unsealing, lift up the oil pipe and the tool string to pull the central pipe 1 upwards. Under the action of the pulling force, the shear pin 02 connected to the unsealing assembly 5 and the central pipe 1 is cut off, so that the unsealing assembly 5 loses its support and collapses. Slide along the central tube 1 to the C-shaped ring 6. At this time, the C-shaped ring 6 supports the unsealing component 5 to prevent the unsealing component 5 from falling. Due to the loss of the support force of the unsealing component 5, the anchor slip component 2 and the rubber tube component 4 shrink, at the same time, the anchor slip assembly 2, the piston assembly 3 and the rubber tube assembly 4 slide down together with the unsealing assembly 5, and the unsealing is completed.

Since the anchor slip assembly 2 is arranged above the rubber tube assembly 4, when the downhole pressure is too high and the packer is pushed up, because the anchor slip assembly 2 is fixedly connected with the center pipe 1, the upper push force is controlled by the anchoring force at the upper end. The slip assembly 2 bears the load, thereby reducing the upward force borne by the unsealing assembly 5, so there is no need for excessive unsealing force to prevent the risk of the packer self-unsealing caused by the upward force, that is, to reduce the unsealing force , to facilitate the unsealing of the packer, and because the anchor slip assembly 2 and the rubber cylinder assembly 4 are respectively arranged at both ends of the piston assembly 3, the seating force of each will not be additionally consumed due to the characteristics of independent movement during setting, The smaller setting force can complete the setting of the packer, that is, the requirement of external setting equipment is reduced, thereby reducing the cost of equipment application.

Review Figures 1 and 4. Furthermore, the center pipe 1 is also provided with perforations 15, which run through both ends of the center pipe 1 and are arranged adjacent to the pipe of the center pipe 1, thus forming a dual-channel packer. When the packer is set in the pipe string A fiber optic cable can be inserted through the perforation 15 to connect with a downhole pressure gauge or thermometer to detect downhole pressure or temperature, or a chemical preservative can be injected through the perforation 15 to protect the annulus casing from corrosion and further improve product practicability.

Refer to Figures 5-6, and review Figures 1-4. Figure 5 is an enlarged view of part A in Figure 4, and Figure 6 is a schematic diagram of the cooperative structure of the slips upper vertebral body, slips and slips lower vertebral body in the embodiment. Further, along the central tube 1 from top to bottom, the rivet slip assembly 2 sequentially includes a slip upper cone 21, a slip assembly 22 and a slip lower cone 23, and the slip upper cone 21 and the slip lower cone 23 is set opposite to each other, the two ends of the slip assembly 22 respectively abut one end of the slip vertebral body and the slip lower vertebral body 23, the other end of the slip upper vertebral body 21 is fixedly connected with the fixing hole 11, and the slip lower vertebral body 23 is connected to the piston Component 3 threaded connection.

Specifically, both the upper slip cone 21 and the lower slip cone 23 have a tapered surface 10, and the tapered surface 10 of the upper slip cone 21 is opposite to the tapered surface 10 of the lower slip cone 23. When setting, The two conical surfaces 10 jointly press the slip assembly 22 so that the slip assembly 22 expands to be anchored on 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 sheathed on the outer wall of the central tube 11 and is located between the upper slip 21 and the lower slip 23. , the two ends of the slip 221 have anchoring teeth 2211, and the slip cage 223 is provided with multiple groups of openings 2231 along the circumferential direction, and each group of openings 2231 has at least two openings, and the two openings are arranged in sequence along the axial direction of the slip cage 223. The cage 223 is sleeved outside the slips 221, the anchor teeth 2211 are exposed in the opening 2231, the elastic piece 222 is located between the slip cage 223 and the slips 221, and the elastic pieces 222 abut against the upper openings of the slip cage 223 respectively. The inner wall and the outer wall between the anchoring teeth 2211 on the slips 221 , specifically, in the slip cage 223 , the elastic piece 222 abuts between two openings of each set of openings 2231 . Before the packer is lowered into the pipe string for setting, since the elastic piece 222 abuts against the slips 221, the teeth 2211 at both ends of the slips 221 are located in the opening 2231, so that the packer enters the pipe string more smoothly. Preferably, in this example, the anchoring teeth 2211 at both ends of the slip 221 adopt a two-way tooth shape, that is, the anchoring teeth 2211 at both ends of the slip 211 face the center line c-c respectively, and the anchoring teeth 2211 at both ends of the slip 221 It is also inclined towards the direction away from the central pipe 1, so that the packer can bear the load of pushing up or down when setting, and the elastic sheet 222 is a metal elastic sheet.

Further, the sides of the slips 221 facing away from the anchoring teeth 2211 are provided with extrusion slopes 2212, and the extrusion slopes 2212 at both ends of the slips 221 are respectively connected to the slip upper vertebral body 21 and the slip lower vertebral body 23 during installation. When setting, the cones 10 of the upper slip 21 and the lower taper 23 of the slips jointly squeeze the extrusion slopes 2212 at both ends of the slips 221, so that the slips 221 expand radially and The elastic piece 222 is compressed, and at the same time, the anchoring teeth 2211 at both ends of the slip 221 are pushed out of the opening 2231 and engaged with the inner wall of the pipe string.

Referring to Fig. 7, review Fig. 1-Fig. 4, Fig. 7 is an enlarged view of part C in the embodiment. Further, the piston assembly 3 includes a partition ring 31, a piston 32, a piston cylinder 33 and an anti-reverse structure 34. The partition ring 31 is sleeved in the annular groove 12. The partition ring 31 is provided with a plurality of overpressure openings 311 along the circumference. The partition ring 31 The inner wall and the bottom of the annular groove 12 form a first piston chamber 122, the piston cylinder 33 is sleeved outside the partition ring 31, the outer wall of the partition ring 31 and the inner wall of the piston cylinder 33 form a second piston chamber 123, the overpressure hole 121 and the first piston chamber 122, the second piston chamber 123 communicates with the first piston chamber 122 through the overpressure opening 311, one end of the piston cylinder 33 is threadedly connected with the rubber cartridge assembly 4, one end of the piston 32 is located in the piston cylinder 33 and is close to the separator ring 31, and the other end is connected to the The slip lower vertebral body 23 is threaded, and the anti-backward structure 34 is arranged between the piston cylinder 33 and the slip lower vertebral body 23 , and is connected with the piston 32 and the piston cylinder 33 .

When setting, the pressure first enters from the pipeline of the central pipe 1 through the pressure transmission hole 121 and fills the first piston chamber 122, then enters the second piston chamber 123 through a plurality of overpressure openings 311, and is released in the second piston chamber 123. Push the piston assembly 3 and the rubber cartridge assembly 4 in different directions. In the piston assembly 3, under the push of the pressure in the second piston chamber 123, the piston 32 moves upwards, and then the piston 32 squeezes the slip lower cone 23, Make the lower slips vertebral body 23 move upwards and push the slips 22 upwards. At this time, the taper surfaces 10 of the slips upper vertebral body 21 and the slips lower vertebral body 23 jointly squeeze the extrusion slopes at both ends of the slips 22, so that the slips The shoe 221 radially expands and compresses the elastic piece 222 , and at the same time, the anchoring teeth 2211 at both ends of the slip 221 push out through the opening 2231 and engage with the inner wall of the pipe string. In the rubber cartridge assembly 4, since the piston cylinder 33 is threadedly connected with the rubber cartridge assembly 4, under the pressure of the second piston chamber 123, the rubber cartridge assembly 4 moves downward, and at this time, the rubber cartridge assembly 4 pulls the piston cylinder 33 together. The downward movement makes the piston cylinder 33 pull the anti-backward structure 34 to move downward, so that the anti-backward structure 34 can limit the position of the piston 32 and the piston cylinder 33, preventing the slips or the rubber tube from rebounding after the pressure release and unable to achieve the seal effect.

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

Referring to Figures 8-11, review Figures 1-4, Figure 8 is an enlarged view of Part B in Figure 4, Figure 9 is an enlarged view of Part E in Figure 8, Figure 10 is a sectional view of a-a in Figure 3, and Figure 11 is Schematic diagram of inner slip sheath and inner slip structure in the embodiment. Furthermore, the anti-backward structure 34 includes a shearing ring 341 and an inner slip assembly 342. The shearing ring 341 is arranged at the end of the piston 32 close to the lower vertebral body 23. The shearing ring 341 is set with the piston 32 through the shearing pin. The shear pin 01 is fixedly connected, the inner slip assembly 34 is arranged between the shear ring 341 and the piston cylinder 33 , and the two ends of the inner slip assembly 34 are threadedly connected with the shear ring 341 and the piston cylinder 33 respectively.

Furthermore, the inner slip assembly 342 includes an inner slip 3421 and an inner slip sheath 3422. It has a first locking tooth 34221, the inner slip 3421 is set between the piston 32 and the inner slip sheath 3422, the outer wall of the inner slip 3421 is provided with a second locking tooth 34211, and the first locking tooth 34221 and the second locking tooth 34211 are engaged , the inner wall of the inner slip 3421 and the outer wall of the piston 32 are provided with anti-backward serrations 20 . When setting, when the pressure of the second piston chamber 123 pushes the piston 32 and the rubber cartridge assembly 4 respectively, the piston 32 and the rubber cartridge assembly 4 move in opposite directions respectively, and at the same time, under the traction of the rubber cartridge assembly 4, the piston cylinder 33 Drive the inner slip sheath 3422 to move, and the inner slip sheath 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 cut, and at the same time, the inner slip sheath The sleeve 3422 also drives the inner slip 3421 and the piston 32 to move relative to each other. During the movement, since the anti-backward teeth 20 on the inner wall of the inner slip 3421 and the outer wall of the piston 32 are unidirectional, the inner slip 3421 and the piston The anti-backward fine teeth 20 on the 32 mesh with each other, so that the inner slip 3421 and the piston 32 cannot move in the opposite direction, thereby preventing the slips or the rubber tube from rebounding after the pressure is released, so that the sealing effect cannot be achieved. Preferably, when the inner slip assembly 342 is installed, the anti-rotation pin 03 is riveted to connect the inner slip 3421 and the inner slip sheath 3422 to prevent relative rotation between the inner slip 3421 and the inner slip sheath 3422 .

Refer to Figures 12-13, and review Figures 1-4. Figure 12 is an enlarged view of part D in Figure 4, and Figure 13 is a schematic diagram of the structure of the back ring in the embodiment. Further, the rubber cartridge assembly 4 includes a rubber cartridge support sleeve 41 , an upper rubber cartridge 42 , a rubber cartridge spacer 43 and a lower rubber cartridge 44 along the central tube 1 from top to bottom. One end of the rubber cartridge support sleeve 41 is located at the piston cylinder 33 The two ends of the upper rubber tube 42 abut against the rubber tube supporting sleeve 41 and the rubber tube spacer ring 43 respectively, and the lower rubber tube 44 respectively touch the unsealing component 5 and the rubber tube spacer ring 43 . Pushed by the pressure in the second piston chamber 123, the rubber sleeve support sleeve 41 squeezes the upper rubber sleeve 42, so that the upper rubber sleeve 42 is pushed downward, and since the unsealing assembly 5 is in a fixed state, the upper rubber sleeve 42, the rubber sleeve The spacer ring 43 and the lower rubber tube 44 are squeezed against each other, so that the upper rubber tube 42 and the lower rubber tube 44 expand radially to realize sealing.

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

Preferably, the rubber cartridge assembly 4 also includes a backing ring 45. The ends of the upper rubber cartridge 42 and the lower rubber cartridge 44 away from the rubber cartridge spacer 43 are inlaid with multi-layer backing rings 45. One end of the backing ring 45 is petal-shaped, and One petal-shaped end of the backing ring 45 faces the rubber tube spacer 43 , and the petal-shaped structures of the multi-layer backing ring 45 are misaligned with each other. By inserting the backing ring 45 into the inside of the upper rubber sleeve 41 and the lower rubber sleeve 44, when the packer goes into the well, there is no redundant retaining ring or backing ring outside the upper rubber sleeve 42 and the lower rubber sleeve 44. The wellbore with a lot of impurities can still pass through smoothly. When the seal is set, the upper rubber sleeve 42 and the lower rubber sleeve 44 are squeezed and expanded. Because the back ring 45 is petal-shaped, it is embedded in the upper rubber sleeve 42 and the lower rubber sleeve The back ring 45 inside the 44 will be stretched to cover the upper rubber tube 42 and the lower rubber tube 44 respectively, so that the sealing time of the upper rubber tube 42 and the lower rubber tube 44 will be longer when subjected to high temperature and high pressure, so as to further improve the sealing effect. interval reliability.

Referring to FIG. 14 , FIG. 14 is a cross-sectional view along line b-b in FIG. 3 . Further, the unsealing assembly 5 includes an unsealing ring 51, the unsealing ring 51 is sheathed outside the central tube 1, and a plurality of unsealing through-holes 511 are uniformly arranged along the circumference of the unsealing ring 51, and the plurality of unsealing through-holes 511 Opposite to the unsealing hole 13 , the unsealing ring 51 is fixed by riveting in the unsealing shear pin 02 to connect the unsealing through hole 511 and the unsealing hole 13 during installation.

When unsealing, the oil pipe tool string is lifted up, and the unsealing shear pin 02 connecting the unsealing through hole 511 and the unsealing hole 13 is cut off. At this time, the unsealing 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 rubber cartridge assembly 4 loses the support of the unsealing ring 51, starts to shrink and slides down together with the unsealing ring 51 , the parts installed on the center tube, since the slip upper cone 21 is fixed to the center tube 1 through the fixing hole 11, and the partition ring 31 is fixed to the center tube 1 through the annular groove 12, so except for the partition ring 31 and the slip upper cone Outside the body 21, the rest all slide down with the lifting of the center pipe 1, the upper rubber sleeve 42, the lower rubber sleeve 44 and the slips 221 shrink to their original shape, the packer is unsealed and the wellhead is lifted out. Since the anchor slip assembly 2 is arranged above the rubber cartridge assembly 4, when the downhole pressure is too high and the packer is pushed up, the upper jacking force is carried by the anchor slip assembly 2 at the upper end and does not act on the central pipe 1. Therefore, the number of shear nails connecting the unsealing through hole 511 and the unsealing hole 13 can be reduced, thereby reducing the unsealing force and facilitating the unsealing of the packer.

To sum up, when setting, the upper and lower ends of the packer are connected with tubing and tool strings to form an oil and gas tubing string. Pressurize the pipe string, and the pressure is transmitted to the first piston chamber and the second piston chamber in turn through the pressure transmission hole on the central tube. When the pressure reaches a certain value, the setting shear pin connecting the shearing ring and the piston is sheared, the piston moves upwards, and the rubber tube support sleeve moves downwards, and the piston continues to move and pushes the slips connected to the piston down. Cone, so as to push the slips, the slips expand radially and push the slip cage to move at the same time, at this time, the slip extrusion slope is in close contact with the taper surfaces of the upper slip cone and the lower slip cone, and the snap teeth Bite the pipe string to achieve anchoring.

Since the pressure transmission hole of the central pipe is between the slip assembly and the rubber cartridge assembly, the upper and lower rubber cartridges are also set while the slips are being set. When the rubber sleeve support sleeve moves downward, it drives the piston cylinder, inner slip sheath, inner slip, and shear ring to move to the right. After reaching the minimum setting pressure, the upper rubber sleeve and the lower rubber sleeve are squeezed, thereby The sealing sleeve, the back ring embedded in the upper rubber tube and the lower rubber tube is also stretched out with the expansion of the upper rubber tube and the lower rubber tube, so as to protect the rubber tube. Since the piston on the packer and the inner slips move relatively during the setting process, after the setting is completed, the anti-retrogression serrations on the inner slips and the anti-retrogression serrations on the piston interlock. After the pressure is released from the setting seal, the upper and lower rubber sleeves cannot rebound, which prevents the rubber sleeve from rebounding after the pressure release and cannot play the role of sealing, forming a permanent setting seal. After the packer is set, the fiber optic cable can be drilled through the hole to connect with the downhole pressure gauge and thermometer to detect the downhole pressure or temperature, or inject chemical preservatives through the hole to protect the casing.

When unsealing, the oil pipe tool string is lifted up, and the unsealing shear pins connecting the unsealing through hole and the unsealing hole are cut off. At this time, the unsealing ring slides down to the C-shaped ring on the central tube and is carried by the C-shaped ring. The rubber cartridge assembly loses the support of the unsealing ring, begins to shrink and slides down together with the unsealing ring, and is installed on the central tube. Except for the separation ring and the upper slip cone, all the parts slide down with the lifting of the center pipe, the upper rubber sleeve, lower rubber sleeve and slips shrink to their original shape, and the packer is unsealed and lifted out of the wellhead.

In this example, by setting the anchor slip assembly above the rubber cartridge assembly, when the downhole pressure is too high and the packer is pushed up, due to the anchor slip assembly and the center The pipe is fixedly connected, and the jacking force is carried by the anchor slip assembly at the upper end, which greatly reduces the jacking force on the unsealing component, so there is no need for excessive unsealing force to prevent the packer from self-sufficiency caused by the jacking force. The risk of unsealing is to reduce the unsealing force and facilitate the unsealing of the packer, thereby reducing the requirements and costs of working equipment on the well.

The above is only the embodiment of the present utility model, and is not intended to limit the present utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the scope of claims of the present utility model.

Claims (10)

1. An easily recoverable suspension packer, characterized in that it comprises: a central pipe, an anchor slip assembly, a piston assembly, a rubber cartridge assembly, an unsealing Components and C-rings; The outer wall of the central tube is sequentially provided with a fixing hole, an annular groove, an unsealing hole and an annular installation groove from top to bottom, the annular groove is provided with a pressure transmission hole, and one end of the anchor slip assembly is connected to the The fixed hole is fixedly connected, the piston assembly is sleeved outside the annular groove and communicated with the pressure transmission hole, and its two ends are respectively screwed to the other end of the anchor slip assembly and one end of the rubber cylinder assembly , the unsealing assembly is fixedly connected to the unsealing hole and abuts against the other end of the rubber cartridge assembly, and the C-ring is fixedly installed in the C-ring installation groove. 2. The easy-to-recover hanging packer according to claim 1, characterized in that, the central pipe is also provided with perforations, and the perforations run through both ends of the central pipe and are connected to the central pipe pipeline. neighbor settings. 3. The easy-to-recover suspension packer according to claim 1, wherein the anchoring slip assembly comprises an upper cone of slips, a slip assembly, and a slip set on the central pipe from top to bottom. The lower vertebral body, the upper slip body and the lower slip body are arranged opposite to each other, the two ends of the slip assembly abut against the upper slip body and the lower slip body respectively, the The upper cone of the slip is fixedly connected with the fixing hole, and the lower cone of the slip is threadedly connected with the piston assembly. 4. The easy-to-recover suspension packer according to claim 3, wherein the slip assembly includes a slip, an elastic sheet and a slip cage, and the two ends of the slip have anchoring teeth, so The slip cage is provided with multiple sets of openings in the axial direction, each set of openings has at least two openings, and the at least two openings are arranged in sequence along the slip cage axial direction, and the slip cage is sleeved outside the slip cage , the anchoring teeth are exposed in the opening, the elastic sheet is located between the slip cage and the slips, and one side thereof abuts against the outer wall between the anchoring teeth at both ends of the slips , and the other side abuts against the inner wall of the slip cage. 5. The easy-to-recover suspension packer according to claim 3, wherein the piston assembly includes a spacer ring, a piston, a piston cylinder and an anti-backup structure, and the spacer ring is sleeved in the annular groove , the divider ring is provided with a plurality of overpressure openings along its circumference, the piston cylinder is sleeved outside the divider ring, one end of which is threaded with the rubber cartridge assembly, and one end of the piston is located in the piston cylinder and close to The other end of the separating ring is threadedly connected to the lower vertebral body of the slips, and the anti-backward structure is arranged between the piston cylinder and the lower vertebral body, and is connected to the piston and the piston cylinder. 6. The easy-to-recover suspension packer according to claim 5, wherein the anti-regression structure includes a shear ring and an inner slip assembly, and the shear ring is arranged on the piston close to the lower One end of the vertebral body, which is fixedly connected to the piston through a shear pin, the inner slip assembly is arranged between the shear ring and the piston cylinder, and its two ends are connected to the shear ring and the piston cylinder respectively. The piston-cylinder threaded connection. 7. The easy-to-recover suspension packer according to claim 6, characterized in that, the inner slip assembly comprises an inner slip and an inner slip sheath, and the two ends of the inner slip sheath are connected to the inner slip sheath respectively. The shearing ring and the piston cylinder are threadedly connected, the inner wall has a first locking tooth, the inner slip is arranged between the piston and the inner slip sheath, and the outer wall is provided with a second locking tooth, The first locking teeth engage with the second locking teeth, and the inner slips and the outer wall of the piston are provided with anti-backward teeth, and the inner slips and the piston move relative to each other in one direction through the anti-backward teeth. 8. The easy-to-recover hanging packer according to claim 6, characterized in that, the rubber sleeve assembly includes a rubber sleeve support sleeve, an upper rubber sleeve, and a rubber sleeve that are sequentially sleeved outside the central pipe from top to bottom. Spacer ring and lower rubber cylinder, one end of the rubber cylinder support sleeve is close to the separation ring and is threadedly connected with the piston cylinder, the two ends of the upper rubber cylinder are respectively abutted against the rubber cylinder support sleeve and the rubber cylinder spacer ring, The lower rubber tube abuts against the unsealing component and the rubber tube spacer respectively. 9. The easy-to-recover hanging packer according to claim 8, characterized in that, the rubber cartridge assembly further includes a backing ring, and the upper and lower rubber cartridges are far away from the rubber cartridge spacer ring One end of each is inlaid with a multi-layer backing ring, one end of the backing ring is petal-shaped, and the petal-shaped end of the backing ring faces the rubber cartridge spacer. 10. The easy-to-recover suspension packer according to claim 1, characterized in that, the unsealing assembly includes an unsealing ring, and the unsealing ring is sleeved outside the central pipe, and a plurality of unsealing through holes, a plurality of said unsealing through holes are opposite to said unsealing holes, said unsealing through holes are connected with said unsealing holes through shear pins, and said unsealing ring abuts against said rubber cartridge components.