Tubing Butt Packer

Abstract

The present application provides a tubing docking packer, which relates to the technical field of oil extraction. The tubing docking packer includes a tubing joint and a packer body; the tubing joint includes a first end and a second end opposite to each other, which are respectively used to connect the upper docking tubing and the packer body; the packer body includes: a mandrel, the mandrel includes a first end and a second end opposite to each other, and the outer circumferential surface of the mandrel is provided with two bosses distributed circumferentially and extending axially at a position close to the first end, which are used to press the upper end surface of the lower docking tubing; a long pressure cap connected to the first end of the mandrel; a guide shoe connected to the second end of the mandrel; the outside of the mandrel is provided with a pressure cylinder, an open pressure sleeve, a spacer sleeve, an upper auxiliary rubber cylinder, an upper spacer ring, a sealing rubber cylinder, a lower spacer ring and a lower auxiliary rubber cylinder in sequence from the long pressure cap to the guide shoe.

Description

Technical Field

[0001] The present application relates to the technical field of oil extraction, and in particular to an oil pipe docking packer. Background Art

[0002] During the horizontal well bare seal segmented transformation process, the suspension packer sometimes fails, resulting in the inability to carry out the production increase operation normally. The failed suspension packer needs to be milled and salvaged. After the failed suspension packer is disposed of, the suspension packer needs to be lowered again. Currently, most of the suspension packers are connected to the oil pipe and sleeve for direct docking with the oil pipe that needs to be docked. When continuing the subsequent production increase operation, since there is no seal at the docking point, the annular space of the technical casing at the bottom of the suspension packer needs to withstand the high pressure connected to the oil pipe, which is easy to cause damage to the technical casing. Summary of the invention

[0003] The purpose of the embodiment of the present application is to provide a tubing docking sealer to achieve sealing at the docking point when the tubings are docked, so that the technical casing does not need to withstand the high pressure connected to the tubing.

[0004] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0005] The present application provides a tubing butt-joint packer, which comprises: a tubing joint and a packer body; the tubing joint comprises a first end and a second end opposite to each other, respectively used to connect an upper butt-joint tubing and the packer body; the packer body comprises: a mandrel, the mandrel comprises a first end and a second end opposite to each other, and the outer circumferential surface of the mandrel is provided with two bosses distributed circumferentially and extending axially at a position close to the first end, which are used to press the upper end surface of the lower butt-joint tubing; a long pressure cap connected to the first end of the mandrel; a guide shoe connected to the second end of the mandrel; an outer surface of the mandrel A pressure cylinder, an open pressure sleeve, a spacer sleeve, an upper auxiliary rubber cylinder, an upper spacer ring, a sealing rubber cylinder, a lower spacer ring and a lower auxiliary rubber cylinder are sequentially sleeved from the long pressure cap to the guide shoe; wherein, the upper end of the pressure cylinder is connected to the second end of the oil pipe joint, the lower end face of the long pressure cap is pressed and held on the inner diameter reduction area of ​​the pressure cylinder, the lower end of the pressure cylinder is axially fixed to the core shaft by a shear pin, the upper end of the open pressure sleeve has an open groove matching the boss, so that the open pressure sleeve passes through the boss and its upper end face is held on the lower end face of the pressure cylinder, and the upper end face of the open pressure sleeve is spaced a preset distance from the upper end face of the boss.

[0006] In some modified embodiments of the present application, the oil pipe joint includes: a coupling, which has internal threads at two opposite ends, respectively used to connect the upper docking oil pipe and the variable buckle short section; a variable buckle short section, which has external threads at two opposite ends, respectively used to connect the coupling and the pressure cylinder of the packer body.

[0007] In some modified embodiments of the present application, the inner surface of the pressure cylinder has a toothed cava tooth; the packer body also includes: a locking cava, which is fixed in a positioning groove of the inner hole of the long pressure cap and has a serrated thread, and is used to cooperate with the toothed cava tooth of the pressure cylinder to limit the long pressure cap from sliding in a direction away from the second end of the core shaft.

[0008] In some modified embodiments of the present application, the inner hole of the pressing cylinder has at least one circle of sealing grooves for accommodating a sealing ring to achieve sealing with the core shaft.

[0009] In some modified implementations of the present application, the pressing cylinder has six threaded holes distributed along its circumference for connecting the six shear pins to achieve axial fixation with the core shaft.

[0010] In some modified embodiments of the present application, the upper end of the inner hole of the long pressure cap has a tapered hole section, and the inner diameter of the tapered hole section gradually decreases from the upper end to the lower end; wherein the taper of the tapered hole section is 15 degrees.

[0011] In some modified implementations of the present application, the spacer includes a first spacer and a second spacer of different axial lengths; or, the spacer includes a first spacer and a second spacer of equal axial lengths.

[0012] In some modified embodiments of the present application, expandable metal bowls are respectively provided on the sides of the upper auxiliary rubber cylinder and the lower auxiliary rubber cylinder facing away from each other, and the opening surfaces of the upper and lower expandable metal bowls are respectively fitted with the angled surfaces of the upper auxiliary rubber cylinder and the lower auxiliary rubber cylinder.

[0013] In some modified embodiments of the present application, the lower end of the outer circumference of the guide shoe has a conical surface section, and the inner diameter of the conical surface section gradually decreases from the upper end to the lower end; wherein the taper of the conical surface section is 15 degrees.

[0014] In some modified embodiments of the present application, the length of the mandrel is 1.5-2m.

[0015] Compared with the prior art, the tubing docking packer provided in the present application is connected to the bottom of the upper docking tubing. After being lowered into the well and inserted into the lower docking tubing 3 that needs to be docked, the upper docking tubing is pressed downward by the support of the top of the lower docking tubing. The tubing docking packer can be reliably sealed and can form a reliable seal at the tubing docking point, thereby effectively avoiding damage to the technical casing caused by the failure to seal the relevant docking point. When operating the tubing docking packer, it is only necessary to press the upper docking tubing down to the specified pressure value, and the tubing docking packer can start to seal without additional operation. The operation method is simple and reliable, and the structure is simple, the processing difficulty is low, and the tool cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0017] Figure 1 The structural diagram of the tubing butt-joint packer proposed in the embodiment of the present invention is schematically shown;

[0018] Figure 2 The schematic diagram of the structure of the tubing docking packer and the lower docking tubing setting seal proposed in the embodiment of the present invention is shown;

[0019] Figure 3 A schematic diagram of a half-section structure of a packer body of a tubing docking packer provided in an embodiment of the present invention is shown;

[0020] Figure 4 A schematic diagram of a partial half-section structure of a packer body of the tubing docking packer provided in an embodiment of the present invention is shown;

[0021] Figure 5 Another partial half-section structure schematic diagram of the packer body of the tubing docking packer proposed in an embodiment of the present invention is schematically shown;

[0022] Figure 6 A schematic diagram of a half-section structure of a tubing joint of a tubing butt-jointed packer provided in an embodiment of the present invention is shown;

[0023] Figure 7 The schematic diagram of the top view of the structure of the mandrel of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0024] Figure 8 A schematic diagram of the main structure of the mandrel of the packer body of the tubing docking packer proposed in an embodiment of the present invention at a first angle is shown;

[0025] Fig. 9 A schematic diagram of the main structure of the mandrel of the packer body of the tubing docking packer proposed in an embodiment of the present invention at a second angle is shown;

[0026] Fig.10 The schematic diagram of the cross-sectional structure of the mandrel of the packer body of the tubing docking packer proposed in an embodiment of the present invention at a second angle is shown;

[0027] Fig.11 The schematic diagram of the top view of the long pressure cap of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0028] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure of the AA section;

[0029] Fig.13 The schematic diagram of the top view of the structure of the pressure cylinder of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0030] Fig.14 for Fig.13 Schematic diagram of the cross-sectional structure of the AA section;

[0031] Fig.15 The schematic diagram of the top view of the open pressing sleeve of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0032] Fig.16 The main structure diagram of the open pressing sleeve of the packer body of the tubing docking packer proposed in the embodiment of the present invention is schematically shown;

[0033] Fig.17 for Fig.16 Schematic diagram of the cross-sectional structure of the middle BB section;

[0034] Fig.18 The schematic diagram of the top view of the expandable metal bowl of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0035] Fig.19 for Fig.18 Schematic diagram of the cross-sectional structure of the AA section;

[0036] Fig. 20 The schematic diagram of the top view of the guide shoe of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0037] Fig.21 for Fig. 20 Schematic diagram of the cross-sectional structure of the AA section;

[0038] Fig. 22 The schematic diagram of the top view of the locking slips of the packer body of the tubing docking packer proposed in the embodiment of the present invention is shown;

[0039] Fig.23 for Fig. 22 Schematic diagram of the cross-sectional structure of the AA section;

[0040] Fig.24 for Fig.23 Schematic diagram of the partial enlarged structure of part A in the middle.

[0041] Description of Figure Numbers:

[0042] Packer body 1, core shaft 11, boss 1101, long pressure cap 12, positioning groove 1201, guide shoe 13, pressure cylinder 14, sealing groove 1401, threaded hole 1402, toothed slip teeth 1403, open pressure sleeve 15, open groove 1501, spacer 16, first spacer 161, second spacer 162, upper auxiliary rubber cylinder 17, upper spacer ring 18, sealing rubber cylinder 19, lower spacer ring 110, lower auxiliary rubber cylinder 111, shear pin 112, locking slip 113, sealing ring 114, expandable metal bowl 115, oil pipe joint 2, coupling 21, variable buckle short section 22, lower docking oil pipe 3. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0045] In the prior art, most of the hanging packers are connected to the oil pipe and sleeve for direct connection with the oil pipe to be connected; when continuing the subsequent production increase operation, since there is no seal at the connection point, the annular space of the technical casing at the bottom of the hanging packer needs to withstand the high pressure connected to the oil pipe, which is easy to cause damage to the technical casing.

[0046] Embodiment 1

[0047] Reference Figure 1 -Attached Fig.21The first embodiment of the present invention proposes a tubing docking packer, which includes: a tubing joint 2 and a packer body 1; the tubing joint 2 includes a first end and a second end opposite to each other, respectively used to connect the upper docking tubing and the packer body 1; the packer body 1 includes: a mandrel 11, the mandrel 11 includes a first end and a second end opposite to each other, and the outer circumferential surface of the mandrel 11 is provided with two bosses 1101 distributed along the circumferential direction and extending along the axial direction near the first end, which are used to press the upper end surface of the lower docking tubing 3; a long pressure cap 12 connected to the first end of the mandrel 11; a guide shoe 13 connected to the second end of the mandrel 11; the outer part of the mandrel 11 is sequentially sleeved from the long pressure cap 12 to the guide shoe 13 A pressure cylinder 14, an open pressure sleeve 15, a spacer sleeve 16, an upper auxiliary rubber cylinder 17, an upper spacer ring 18, a sealing rubber cylinder 19, a lower spacer ring 110 and a lower auxiliary rubber cylinder 111 are provided; wherein, the upper end of the pressure cylinder 14 is connected to the second end of the oil pipe joint 2, the lower end surface of the long pressure cap 12 is pressed and held in the inner diameter reduction area of ​​the pressure cylinder 14, the lower end of the pressure cylinder 14 is axially fixed to the core shaft 11 by a shear pin 112, the upper end of the open pressure sleeve 15 has an open groove 1501 that cooperates with the boss 1101, so that the open pressure sleeve 15 passes through the boss 1101 and its upper end surface is held on the lower end surface of the pressure cylinder 14, and the upper end surface of the open pressure sleeve 15 is spaced a preset distance from the upper end surface of the boss 1101.

[0048] Specifically, in order to solve the above-mentioned technical problem that the casing is easily damaged due to the lack of sealing at the tubing joint, the tubing joint packer proposed in this embodiment mainly includes two parts, namely: a tubing joint 2 and a packer body 1; wherein the upper end of the tubing joint 2 is used to connect the upper joint tubing, and the lower end thereof is connected to the packer body 1. Figure 3 -Attached Figure 5 The packer body 1 includes a mandrel 11, and the upper end of the mandrel 11 has two bosses 1101, which can be specifically configured as two fan-shaped bosses 1101 spaced 90 degrees apart and symmetrically distributed about the body of the mandrel 11 (see attached Figure 3); the upper and lower ends of the core shaft 11 are respectively connected with a long pressure cap 12 and a guide shoe 13, and the outside of the core shaft 11 is sequentially sleeved with a pressure cylinder 14, an open pressure sleeve 15, a spacer sleeve 16, an upper auxiliary rubber cylinder 17, an upper spacer ring 18, a sealing rubber cylinder 19, a lower spacer ring 110 and a lower auxiliary rubber cylinder 111 from the long pressure cap 12 to the guide shoe 13; wherein, the long pressure cap 12 can be processed by 42CrMo / 35CrMo alloy steel material, and the lower end surface of the long pressure cap 12 is pressed and held with the variable diameter area of ​​the pressure cylinder 14; the upper end of the pressure cylinder 14 is used to connect the lower end of the oil pipe joint 2, and the lower end of the pressure cylinder 14 is circumferentially fixed to the core shaft 11 by a plurality of shear pins 112. Specifically, 6 threaded holes 1402 can be evenly arranged along the axial direction at the lower end of the pressure cylinder 14 for installing 6 shear pins 112 to achieve fixation with the core shaft 11, but the number of threaded holes 1402 and shear pins 112 is not limited. Limited to this; the upper end of the open pressing sleeve 15 has an open groove 1501 that cooperates with the boss 1101, so that the upper end of the open pressing sleeve 15 passes through the boss 1101, so that its upper end surface is held on the lower end surface of the pressing cylinder 14, and the upper end surface of the open pressing sleeve 15 is spaced a preset distance from the upper end surface of the boss 1101, so that the downward pressure of the pressing cylinder 14 can be transmitted through the open buckle pressing sleeve, and the open pressing sleeve 15 can slide relative to the core shaft 11. The distance between the boss 1101 on the core shaft 11 and the upper end surface of the open pressing sleeve 15 can, on the one hand, provide a downward stroke for the pressing cylinder 14, and on the other hand, limit the downward stroke of the pressing cylinder 14. When the lower end surface of the pressing cylinder 14 is held on the upper end surface of the boss 1101 of the core shaft 11, the downward stroke is in place, which can prevent the sealing rubber cylinder 19 from being squeezed and destroyed. The preset distance can be specifically set according to actual conditions and is not specifically limited here.

[0049] Specifically, in order to save processing costs, refer to the attached Figure 6 The tubing joint 2 can be composed of two parts, namely: a coupling 21 and a variable buckle short section 22, wherein the coupling 21 is provided with internal threads at opposite ends thereof, respectively, for connecting the upper butt tubing and the variable buckle short section 22; the variable buckle short section 22 is provided with external threads at opposite ends thereof, respectively, for connecting the internal threads at the lower end of the coupling 21 and the internal threads at the upper end of the pressure cylinder 14 of the packer body 1.

[0050] For details, please refer to the attached Figure 3, the length of the core shaft 11 can be set to about 1.5-2m, which can ensure that after the packer body 1 is inserted into the lower docking oil pipe 3, it will not fall out of the lower docking oil pipe 3 when the pipe string is extended or retracted, thereby ensuring the reliability of the seal at the oil pipe docking point; since the length of the core shaft 11 is relatively long, the required length of the spacer 16 is also relatively long. For ease of processing, the spacer 16 can be divided into two parts for processing, namely a first spacer 161 and a second spacer 162. The lengths of the first spacer 161 and the second spacer 162 can be equal, or the lengths of the first spacer 161 and the second spacer 162 can also be unequal. No specific limitation is made here, and it can be set according to actual conditions.

[0051] When performing the sealing operation, the lower end external thread of the upper butt-jointed oil pipe is connected with the upper end internal thread of the coupling 21 of the oil pipe joint 2, and tightened according to the specified torque; the connected tool string is lowered to the top of the lower butt-jointed oil pipe 3, and the butt-jointed oil pipe packer is slowly inserted into the lower butt-jointed oil pipe 3. After it is in place, the diameter-changing position of the packer (the boss 1101 of the mandrel 11) will be supported on the top (fish top) of the lower butt-jointed oil pipe 3, and the shear pin 112 connected to the pressure cylinder 14 and the mandrel 11 by pressing down the upper butt-jointed oil pipe to a preset value. When shearing, the pressure cylinder 14 moves downward, driving the open pressure sleeve 15 and the spacer sleeve 16 to move downward, thereby squeezing the upper auxiliary rubber cylinder 17, the upper spacer ring 18, the sealing rubber cylinder 19, the lower spacer ring 110 and the lower auxiliary rubber cylinder 111, so that the sealing rubber cylinder 19 can be attached to the inner wall of the lower docking oil pipe 3, thereby completing the sealing operation, and the oil pipe docking position can be sealed, such as anchoring the pipe string with a hydraulic anchor, and various subsequent downhole operation measures can be carried out, which can be applied to downhole operations such as oil and gas well fracturing and acidizing, production increase treatment, well repair operations, and old well reconstruction.

[0052] According to the above, an embodiment of the present invention proposes a tubing docking packer, which is connected to the bottom of the upper docking tubing, and after being lowered into the well and inserted into the lower docking tubing 3 that needs to be docked, the upper docking tubing is pressed down by the support of the top of the lower docking tubing, and the tubing docking packer can be reliably sealed, and a reliable seal can be formed at the tubing docking point, thereby effectively avoiding damage to the technical casing caused by the unsealed docking point; and when operating the tubing docking packer, it only needs to press the upper docking tubing down to a specified pressure value, and the tubing docking packer can start to seal, without the need for additional operation, the operation method is simple and reliable, and the structure is simple, the processing difficulty is low, and the tool cost can be reduced.

[0053] For further information, see Attachment Figure 4 , Attachment Fig.12 , Attachment Fig.14 And attached Fig. 22 -Attached Fig.24In a specific implementation, the inner surface of the pressure cylinder 14 has a toothed cava tooth 1403; the packer body 1 also includes: a locking cava 113, which is fixed in the positioning groove 1201 of the inner hole of the long pressure cap 12 and has a serrated thread, and is used to cooperate with the toothed cava tooth 1403 of the pressure cylinder 14 to limit the long pressure cap 12 from sliding in the direction away from the second end of the core shaft 11.

[0054] Specifically, when sealing, the pressure cylinder 14 moves downward under pressure. In order to avoid its reverse movement and affect the reliability of sealing, in the technical solution adopted by the present invention, a serrated cava tooth 1403 is processed on the inner surface of the pressure cylinder 14, and correspondingly, an assembly groove is processed on the outer surface of the long pressure cap 12 for installing a locking cava 113. The locking cava 113 has a serrated thread and can cooperate with the serrated cava of the pressure cylinder 14, and the serrated thread of the locking cava 113 is configured to have the same direction as the serrated cava tooth 1403 of the pressure cylinder 14 and to face downward, thereby limiting the pressure cylinder 14 from moving upward, that is, in the direction away from the second end of the core shaft 11.

[0055] For details, please refer to the attached Fig. 22 -Attached Fig.24 The locking cava 113 can be processed with 65Mn or 60Si2Mn spring steel material; and an opening is set on the side of the locking cava 113 to avoid elastic assembly into the assembly groove of the long pressure cap 12; the climbing angle b of the serrated thread of the locking cava 113 can be set to 60°, and the locking angle c can be set to a locking angle of -3°, and the toothed cava tooth 1403 of the pressure cylinder 14 can be adapted thereto, which can make the locking cava 113 more stable and reliable for locking the pressure cylinder 14.

[0056] For further information, see Attachment Fig.13 -Attached Fig.14 In a specific implementation, the inner hole of the pressing cylinder 14 has at least one circle of sealing groove 1401 for accommodating a sealing ring 114 to achieve sealing with the core shaft 11.

[0057] Specifically, in order to improve the sealing performance of the connection between the pressure cylinder 14 and the core shaft 11, realize the fixed sealing connection between the two when the shear pin 112 is not cut off, and the sliding sealing connection between the two after the shear pin 112 is cut off, and ensure the reliable sealing of the oil pipe docking position, in the technical solution adopted by the present invention, at least one circle of sealing grooves 1401 surrounding the inner hole of the pressure cylinder 14 is provided. For details, please refer to the attached Figure 4 Three circles of mutually spaced sealing grooves 1401 are arranged axially along the inner hole of the pressure cylinder 14 , and the sealing groove 1401 is used to install a sealing ring 114 , specifically an O-ring 114 can be used to achieve reliable sealing between the pressure cylinder 14 and the core shaft 11 .

[0058] For further information, see Attachment Fig.12 In a specific implementation, the upper end of the inner hole of the long pressure cap 12 has a tapered hole section, and the inner diameter of the tapered hole section gradually decreases from the upper end to the lower end; wherein the taper of the tapered hole section is 15 degrees.

[0059] Specifically, in the technical solution adopted by the present invention, a tapered hole section is configured in the inner hole of the upper end of the long pressure cap 12. Specifically, the taper of the tapered hole section can be set to 15 degrees, which is conducive to the downward flow of liquid inside the oil pipe and can reduce turbulence caused by sudden changes.

[0060] For further information, see Attachment Figure 5 And attached Fig.18 -Attached Fig.19 In a specific implementation, an expandable metal bowl 115 is respectively provided on the side of the upper auxiliary rubber cylinder 17 and the lower auxiliary rubber cylinder 111 facing away from each other, and the opening surfaces of the upper and lower expandable metal bowls 115 are respectively fitted with the oblique surfaces of the upper auxiliary rubber cylinder 17 and the lower auxiliary rubber cylinder 111.

[0061] Specifically, in order to improve the sealing performance of the sealing rubber cylinder 1910, in the technical solution adopted by the present invention, an expandable metal bowl 115 is respectively provided on the upper side of the upper auxiliary rubber cylinder 17 and the lower side of the lower auxiliary rubber cylinder 111. The expandable metal bowl 115 can be made of 10 steel, and the mouth has a 60° thin edge of 1-1.5mm. After installation, it fits with the corresponding bevel surface of the upper auxiliary rubber cylinder 17 or the lower auxiliary rubber cylinder 111, and can fit tightly with the inner wall of the sleeve after compression and expansion to protect the sealing of the sealing rubber cylinder 19.

[0062] For further information, see Attachment Fig. 20 and attached Fig.21 In a specific implementation, the lower end of the outer circumference of the guide shoe 13 has a conical surface section, and the inner diameter of the conical surface section gradually decreases from the upper end to the lower end; wherein the taper of the conical surface section is 15 degrees.

[0063] Specifically, in the technical solution adopted by the present invention, a conical surface section is provided at the lower end of the guide shoe 13, and the taper of the conical surface can refer to the attached Fig.21 The angle a in the guide shoe 13 can be specifically configured to be 15 degrees, which can facilitate the insertion of the packer body 1 into the lower docking tubing 3; and a trapezoidal thread can be provided at the upper end of the inner hole of the guide shoe 13 for connecting the external thread at the lower end of the mandrel 11.

[0064] When installing the tubing butt-jointed packer proposed in this embodiment, first install the three sealing rings 114 into the sealing groove 1401 inside the pressure cylinder 14, then install the pressure cylinder 14 from the upper end of the core shaft 11, align the six threaded holes 1402 of the pressure cylinder 14 with the corresponding six mounting holes on the core shaft 11, install the six shear pins 112 into the corresponding threaded holes 1402 on the pressure cylinder 14 and tighten them in place to achieve relative fixation of the pressure cylinder 14 and the core shaft 11; install the locking slip 113 into the positioning groove 1201 of the inner hole of the long pressure cap 12, and the saw blade of the locking slip 113 is screwed into the sealing groove 1201 of the inner hole of the long pressure cap 12. The tooth thread opens downward, connects the internal thread at the lower end of the long pressure cap 12 to the external thread at the upper end of the core shaft 11, clamps the upper part of the long pressure cap 12 and tightens it according to the specified torque; installs the open pressure sleeve 15 from the lower end of the core shaft 11, makes the open groove 1501 of the open pressure sleeve 15 pass through the boss 1101 of the core shaft 11, and then presses the upper end surface of the open pressure sleeve 15 against the lower end surface of the pressure cylinder 14; installs the spacer sleeve 16 from the lower end of the core shaft 11, so that it contacts the lower end surface of the open pressure sleeve 15; installs an expandable metal bowl 115 from the lower end of the core shaft 11, and requires it to open downward; The auxiliary rubber cylinder 17 is installed from the lower end of the core shaft 11, and its bevel surface is required to face upward so that its bevel surface fits with the opening surface of the expandable metal bowl 115; the upper spacer ring 18 is installed from the lower end of the core shaft 11, so that its upper end surface fits with the lower end surface of the upper auxiliary rubber cylinder 17; the upper spacer ring 18 is installed from the lower end of the core shaft 11, so that its upper end surface fits with the lower end surface of the upper auxiliary rubber cylinder 17; the sealing rubber cylinder 19 is installed from the lower end of the core shaft 11, so that its upper end surface fits with the lower end surface of the upper spacer ring 18; the lower spacer ring 110 is installed from the lower end of the core shaft 11, so that its upper end surface fits with the lower end surface of the sealing rubber cylinder 19 The end faces fit together; install the lower auxiliary rubber cylinder 111 from the lower end of the core shaft 11, requiring its beveled surface to face downward, and its upper end face to fit with the lower end face of the lower spacer ring 110; install an expandable metal bowl 115 from the lower end of the core shaft 11, requiring its opening to face upward and fit with the beveled surface of the lower auxiliary rubber cylinder 111; connect the upper end internal thread of the guide shoe 13 with the external thread at the lower end of the core shaft 11, requiring the upper end face of the guide shoe 13 to contact with the expandable metal bowl 115, and install it into the threaded hole of the guide shoe 13 with two screws and tighten it to achieve reliable fixation of the guide shoe 13 and the core shaft 11.

[0065] It should be noted that in the description of this specification, the terms "upper", "lower", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "connect", "install", "fixed", etc. should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A tubing butt-jointed packer, characterized in that: include: Tubing joints and packer body; The tubing joint comprises a first end and a second end opposite to each other, respectively used for connecting the upper butt tubing and the packer body; The packer body comprises: A mandrel, the mandrel comprising a first end and a second end opposite to each other, and the outer circumferential surface of the mandrel near the first end is provided with two bosses distributed in the circumferential direction and extending in the axial direction, for pressing the upper end surface of the lower butt oil pipe; A long pressure cap connected to the first end of the mandrel; A guide shoe connected to the second end of the mandrel; The outside of the core shaft is sequentially sleeved with a pressure cylinder, an open pressure sleeve, a spacer sleeve, an upper auxiliary rubber cylinder, an upper spacer ring, a sealing rubber cylinder, a lower spacer ring and a lower auxiliary rubber cylinder from the long pressure cap to the guide shoe; The upper end of the pressure cylinder is connected to the second end of the oil pipe joint, the lower end surface of the long pressure cap is pressed on the inner diameter reduction area of ​​the pressure cylinder, the lower end of the pressure cylinder is axially fixed to the core shaft by a shear pin, the inner surface of the pressure cylinder has toothed slip teeth, the upper end of the open pressure sleeve has an open groove matched with the boss, so that the open pressure sleeve passes through the boss and its upper end surface is held on the lower end surface of the pressure cylinder, and the upper end surface of the open pressure sleeve is spaced a preset distance from the upper end surface of the boss; A locking slip, fixed in a positioning groove of the inner hole of the long pressure cap and having a sawtooth thread, used to cooperate with the toothed slip teeth of the pressure cylinder to limit the long pressure cap from sliding in a direction away from the second end of the core shaft; Wherein, the oil pipe joint comprises: A coupling, with internal threads at opposite ends thereof, respectively used to connect the upper butt oil pipe and the variable buckle nipple; The variable buckle short section has external threads at opposite ends thereof, which are respectively used to connect the coupling and the pressure cylinder of the packer body.

2. The tubing butt-joint packer according to claim 1, characterized in that: The inner hole of the pressing cylinder has at least one circle of sealing groove for accommodating a sealing ring to achieve sealing with the core shaft.

3. The tubing butt-joint packer according to claim 1, characterized in that: The pressing cylinder is provided with 6 threaded holes distributed along its circumference for connecting the 6 shear pins to achieve axial fixation with the core shaft.

4. The tubing butt-joint packer according to claim 1, characterized in that: The upper end of the inner hole of the long pressure cap has a tapered hole section, and the inner diameter of the tapered hole section gradually decreases from the upper end to the lower end; Wherein, the taper of the tapered hole section is 15 degrees.

5. The tubing butt-joint packer according to claim 1, characterized in that: The spacer comprises a first spacer and a second spacer of different axial lengths; or, The spacer comprises a first spacer and a second spacer having equal axial lengths.

6. The tubing butt-joint packer according to claim 1, characterized in that: An expandable metal bowl is provided on the side of the upper auxiliary rubber tube and the lower auxiliary rubber tube facing away from each other, and the opening surfaces of the upper and lower expandable metal bowls are respectively fitted with the bevel surfaces of the upper auxiliary rubber tube and the lower auxiliary rubber tube.

7. The tubing butt-jointed packer according to claim 1, characterized in that: The lower end of the outer circumference of the guide shoe has a conical surface section, and the inner diameter of the conical surface section gradually decreases from the upper end to the lower end; Wherein, the taper of the conical surface segment is 15 degrees.

8. The tubing butt-jointed packer according to claim 1, characterized in that: The length of the mandrel is 1.5-2m.

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