A safe and easy-to-operate drop-out connector

Abstract

The present invention provides a safety release joint that is easy to operate, and relates to the field of release devices in oilfield exploitation technology, comprising an upper joint; the lower end of the upper joint is externally slidably connected to a lower joint, and the upper end of the upper joint is connected to a pipe column through a thread, and the lower end of the lower joint is connected to the upper end of a downhole tool connector through a thread; the present invention sets the shear nail diameter to three to five millimeters, so that a steel ball can break two shear nails through a sliding sleeve under a relatively small pressure, so that only a relatively small pressure is needed to break the shear nails after the ball is thrown, thereby avoiding adverse effects on other downhole tools and continuous oil pipes; the problem that the current safety release joint generally uses shear nails with larger diameters when in use, so that when the safety release joint needs to be released, a relatively large pressure is needed to break the shear nails after the ball is thrown, and excessively high pressure will also bring adverse effects on other downhole tools and continuous oil pipes.

Description

Technical Field

[0001] The invention relates to the technical field of release devices in oilfield exploitation technology, and in particular to a safe release joint that is easy to operate. Background Art

[0002] At present, in the process of oil field exploitation, in order to reduce the mutual interference between oil layers and improve the recovery rate of oil layers, stratified exploitation is usually carried out. The stratified exploitation technology is achieved by setting packers between the oil layers on the production string in the oil well. In order to solve the problem that the packer cannot be unsealed when it encounters a failure, a safety release joint is usually installed on the upper part of the packer and other tools in the well. When the packer and other tools encounter a failure, the safety joint is used to release the packer and other tools temporarily in the well, and then the part of the string above the safety release joint is first lifted out of the wellbore.

[0003] When the current safety release joint needs to be released, it is generally done by throwing a ball and holding pressure to push the sliding sleeve to break the shear nails, so that the tools such as the packer and the pipe string fall off; however, when the current safety release joint is in use, in order to withstand the torque and tension of the pipe string and the downhole tool, a larger diameter shear nail is often used. As a result, when the safety release joint needs to be released, a larger pressure is required to break the shear nails after throwing the ball, and excessive pressure will also have an adverse effect on other downhole tools and continuous oil pipes, making the safety release joint not easy to release; in addition, the current safety release joint is connected to the pipe string and the downhole tool through threads, and the threaded connection is easily loosened due to stress, thereby reducing the firmness of the safety release joint when connected between the pipe string and the downhole tool. Summary of the invention

[0004] In view of this, the present invention provides a safety release joint that is easy to operate to solve the problem that the current safety release joint generally uses shear nails with larger diameters when in use. In this way, when the safety release joint needs to be released, a larger pressure is required after the ball is dropped to break the shear nails, and too high pressure will also have an adverse effect on other downhole tools and continuous oil pipes.

[0005] The present invention provides a safe and easy-to-operate release joint, which specifically comprises: an upper joint; a lower joint is externally slidably connected to the lower joint at the lower end of the upper joint, and the upper end of the upper joint is connected to a pipe column by a thread, and the lower end of the lower joint is connected to the upper end of a downhole tool connector by a thread; an anti-loosening component is arranged between the upper joint and the outside of the pipe column, and an anti-loosening component is also arranged between the lower joint and the outside of the downhole tool connector; the lower end of the upper joint is fixedly connected to a sliding sleeve by two shear nails, and the diameter of the shear nails is three to five millimeters; a total of twenty-four trapezoidal limiting blocks are arranged in a ring array on the lower side of the upper joint and the upper side of the lower joint; a steel ball is placed on the upper end of the sliding sleeve in the upper joint.

[0006] Furthermore, the lower outer surface of the upper joint is provided with twenty-four trapezoidal openings in a circular array, and the lower outer surface of the upper joint is provided with six guide slides in a circular array; the lower outer surface of the upper joint is provided with two shear nail plug-in holes A in a circular array, and each shear nail plug-in hole A is provided with a shear nail.

[0007] Furthermore, an annular groove is provided on the upper side of the inner circumference of the lower joint, and twenty-four trapezoidal grooves are provided on the inner circumference of the annular groove in a circular array, and trapezoidal limiting blocks are placed inside the twenty-four trapezoidal grooves and the twenty-four trapezoidal openings; six strip-shaped slide grooves are provided on the inner circumference of the annular groove in a circular array.

[0008] Furthermore, when the lower joint and the upper joint are in the installed state, the six guide slide bars are slidably connected to the six strip-shaped slide grooves respectively.

[0009] Furthermore, the anti-loosening component comprises an annular fixing plate, a rectangular sliding cylinder, an annular plug-in plate, a rectangular plug-in hole, a plug-in strip, a rectangular sliding block and a pulling rod, wherein the annular fixing plate in the upper anti-loosening component is fixedly connected to the lower part of the outer peripheral surface of the pipe column, and the annular fixing plate in the lower anti-loosening component is fixedly connected to the upper part of the outer peripheral surface of the downhole tool connecting head; the annular plug-in plate in the upper anti-loosening component is fixedly connected to the upper part of the outer peripheral surface of the upper joint, and the annular plug-in plate in the lower anti-loosening component is fixedly connected to the lower part of the outer peripheral surface of the lower joint, and the upper end surface of the annular plug-in plate is provided with rectangular plug-in holes in an annular array; one side of the annular fixing plate is fixedly connected to two rectangular sliding cylinders in a left-right symmetrical shape, and a rectangular sliding block is slidably connected inside each rectangular sliding cylinder; one side of each of the rectangular sliding cylinders is fixedly connected to a plug-in strip, and the other side of each rectangular sliding cylinder is fixedly connected to a pulling rod, and the outside of each pulling rod is located inside the rectangular sliding cylinder and is sleeved with a spring; the plug-in strip and the pulling rod respectively pass through the upper and lower ends of the rectangular sliding cylinder.

[0010] Furthermore, when the anti-loosening component is in the anti-loosening state, the head end of the plug-in strip is plugged into the rectangular plug-in hole.

[0011] Furthermore, a push spring is fixedly connected to the outer end of the trapezoidal limiting block, and the push spring is located inside the trapezoidal groove.

[0012] Furthermore, the inner circumference of the sliding sleeve is fixedly connected to the reinforcing tube via six reinforcing ribs, and two shear nail insertion holes B are provided in a circular array at the lower part of the outer circumference of the sliding sleeve.

[0013] Furthermore, it also includes a synchronous lifting component, the number of which is two, and the two synchronous lifting components are respectively arranged at opposite ends of two anti-loosening components; the synchronous lifting component includes an annular sliding plate, a T-shaped slide rail, an annular limiting plate, a buckle installation port, an elastic buckle and a rectangular clip interface, the inner circumference of the annular sliding plate is provided with four T-shaped slide grooves, and each T-shaped slide groove is slidably connected to a T-shaped slide rail, and the T-shaped slide rail is fixed to the annular fixed plate; the other ends of the four T-shaped slide rails are fixedly connected to an annular limiting plate, and the upper end surface of the annular limiting plate is symmetrically provided with four buckle installation ports, each buckle installation port is slidably connected to an elastic buckle, and a spring is installed inside each buckle installation port; the upper end surface of the annular sliding plate is symmetrically provided with two rectangular clip interfaces.

[0014] Furthermore, when the opposite surfaces of the annular sliding plate and the annular limiting plate are in contact with each other, the four elastic buckles are respectively engaged with the two rectangular clamping interfaces.

[0015] The invention provides a simple and easy-to-operate safety release joint, which has the following beneficial effects:

[0016] The present invention can make the torsion generated between the upper joint and the lower joint be borne by the six guide slide bars through the arrangement of the guide slide bars, the trapezoidal limiting blocks, the sliding sleeves and the shear nails, and the tensile force generated between the upper joint and the lower joint will be borne by the twenty-four trapezoidal limiting blocks, so that the shear nails will not be affected, so that the shear nails can be set to a smaller diameter, and by setting the shear nails to a smaller diameter, the shear nail diameter is three millimeters to five millimeters, so that the steel ball can break the two shear nails through the sliding sleeve under a smaller pressure, so that after the ball is thrown, only a smaller pressure is needed to break the shear nails, avoiding adverse effects on other downhole tools and continuous oil pipes, so that the safety release joint is easier to release.

[0017] The present invention can achieve effective anti-loosening effect between the upper joint and the pipe string by setting the upper anti-loosening component, and then achieve effective anti-loosening effect between the lower joint and the downhole tool connector by setting the lower anti-loosening component, thereby avoiding the threaded connection of the safety release joint from loosening due to force, thereby improving the firmness of the safety release joint when connected between the pipe string and the downhole tool connector.

[0018] The present invention provides a synchronous lifting component, so that when the plug-in strip needs to be pulled out from the rectangular plug-in hole, it only needs to slide the annular sliding plate toward the annular limiting plate, so that the opposite surfaces of the annular sliding plate and the annular limiting plate contact each other, and then the four elastic buckles are respectively engaged with the two rectangular card interfaces, so that the plug-in strip can be effectively limited after being pulled out, thereby improving the convenience of the safety release joint when installing and disassembling between the pipe string and the downhole tool connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] In the attached picture:

[0021] Figure 1 is a schematic diagram of the axial structure of an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of an embodiment of the present invention in a disassembled state;

[0023] Figure 3 It is a partial cross-sectional structural schematic diagram of an upper joint, a lower joint, a sliding sleeve and a reinforcing tube of an embodiment of the present invention;

[0024] Figure 4 The embodiment of the present invention Figure 3 A schematic diagram of the partially enlarged structure at center A;

[0025] Figure 5 is a schematic diagram of the upper joint and the sliding sleeve structure of an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of the axial structure of the upper joint of an embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of the sliding sleeve structure of an embodiment of the present invention;

[0028] Figure 8 2 is a schematic diagram of the structure of the lower joint and the trapezoidal limiting block after being separated in an embodiment of the present invention;

[0029] Fig. 9 2 is a schematic diagram of the axial structure of the anti-loosening assembly and the synchronous lifting assembly of an embodiment of the present invention;

[0030] Fig.10 2 is a schematic diagram of the structure of the pull rod and the synchronous lifting assembly after being disassembled according to an embodiment of the present invention;

[0031] Fig.11 The embodiment of the present invention Fig. 9 Schematic diagram of the local enlarged structure at point B in the middle.

[0032] Reference numerals list

[0033] 1. Upper joint; 101. Trapezoidal opening; 102. Guide slide; 103. Shear nail plug-in hole A; 2. Lower joint; 201. Trapezoidal groove; 202. Annular groove; 203. Strip slide; 3. Pipe string; 4. Downhole tool connector; 5. Anti-loosening assembly; 501. Annular fixing plate; 502. Rectangular slide; 503. Annular plug-in plate; 504. Rectangular plug-in hole; 505. Plug-in strip; 506 , rectangular slider; 507, pulling rod; 6, synchronous lifting assembly; 601, annular sliding plate; 602, T-shaped slide rail; 603, annular limit plate; 604, buckle installation port; 605, elastic buckle; 606, rectangular card interface; 7, steel ball; 8, trapezoidal limiting block; 801, push spring; 9, sliding sleeve; 901, reinforcement cylinder; 902, reinforcement rib; 903, shear nail plug-in hole B; 10, shear nail. DETAILED DESCRIPTION

[0034] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention.

[0035] Example 1: Figures 1 to 11 As shown: the present invention provides a safe hand-release joint that is easy to operate, comprising an upper joint 1; a lower joint 2 is externally slidably connected to the lower joint 2 at the lower end of the upper joint 1, and a pipe column 3 is connected to the upper end of the upper joint 1 through a thread, and the lower end of the lower joint 2 is connected to the upper end of a downhole tool connector 4 through a thread; an anti-loosening component 5 is provided between the upper joint 1 and the outside of the pipe column 3, and an anti-loosening component 5 is also provided between the lower joint 2 and the outside of the downhole tool connector 4; the lower end of the upper joint 1 is fixedly connected to a sliding sleeve 9 through two shear nails 10, and the diameter of the shear nails 10 is three to five millimeters. By making the diameter of the shear nails 10 three to five millimeters, the steel ball 7 can break the two shear nails 10 through the sliding sleeve 9 under a relatively small pressure, so that the shear nails 10 can be broken with only a relatively small pressure after the ball is thrown, thereby avoiding adverse effects on other downhole tools and continuous oil pipes;

[0036] A total of twenty-four trapezoidal limiting blocks 8 are arranged in a circular array on the lower side of the upper joint 1 and the upper side of the lower joint 2; a steel ball 7 is placed inside the upper joint 1 at the upper end of the sliding sleeve 9; the inner circumference of the sliding sleeve 9 is fixedly connected to the reinforcement tube 901 through six reinforcing ribs 902, and the lower part of the outer circumference of the sliding sleeve 9 is provided with two shear nail insertion holes B903 in a circular array.

[0037] Twenty-four trapezoidal openings 101 are provided on the lower outer surface of the upper joint 1 in a circular array, and six guide slides 102 are provided on the lower outer surface of the upper joint 1 in a circular array; two shear nail plug-in holes A103 are provided on the lower outer surface of the upper joint 1 in a circular array, and a shear nail 10 is provided inside each shear nail plug-in hole A103.

[0038] An annular groove 202 is provided on the upper side of the inner circumference of the lower joint 2, and twenty-four trapezoidal grooves 201 are provided on the inner circumference of the annular groove 202 in an annular array, and trapezoidal limiting blocks 8 are placed inside the twenty-four trapezoidal grooves 201 and the twenty-four trapezoidal openings 101. Through the provision of the twenty-four trapezoidal limiting blocks 8, the pulling force between the upper joint 1 and the lower joint 2 can be substituted for the shear nails 10; six strip slide grooves 203 are provided on the inner circumference of the annular groove 202 in an annular array; a push spring 801 is fixedly connected to the outer end of the trapezoidal limiting block 8, and the push spring 801 is inside the trapezoidal groove 201; when the lower joint 2 and the upper joint 1 are in the installed state, the six guide slide bars 102 are respectively slidably connected to the six strip slide grooves 203. Through the provision of the six guide slide bars 102, the torsion generated between the upper joint 1 and the lower joint 2 can be substituted for the shear nails 10.

[0039] The anti-loosening component 5 includes an annular fixing plate 501, a rectangular slide 502, an annular plug plate 503, a rectangular plug hole 504, a plug strip 505, a rectangular slider 506 and a pull rod 507. The annular fixing plate 501 in the upper anti-loosening component 5 is fixedly connected to the lower part of the outer circumference of the pipe column 3, and the annular fixing plate 501 in the lower anti-loosening component 5 is fixedly connected to the upper part of the outer circumference of the downhole tool connector 4; the annular plug plate 503 in the upper anti-loosening component 5 is fixedly connected to the upper part of the outer circumference of the upper joint 1, and the annular plug plate 503 in the lower anti-loosening component 5 is fixedly connected to the lower part of the outer circumference of the lower joint 2. The upper end surface of the annular plug plate 503 is provided with rectangular plug holes 504 in an annular array; one side of the annular fixing plate 501 is fixedly connected with two rectangular The slide tube 502 is provided with a rectangular slider 506 which is slidably connected to the inside of each rectangular slide tube 502; a plug-in strip 505 is fixedly connected to one side of each rectangular slider 506, and a pulling rod 507 is fixedly connected to the other side of each rectangular slider 506, and a spring is sleeved on the outside of each pulling rod 507 which is located inside the rectangular slide tube 502; the plug-in strip 505 and the pulling rod 507 respectively pass through the upper and lower ends of the rectangular slide tube 502; when the anti-loosening component 5 is in the anti-loosening state, the head end of the plug-in strip 505 is plugged into the rectangular plug hole 504; by setting the upper anti-loosening component 5, an effective anti-loosening effect can be obtained between the upper joint 1 and the pipe column 3, and then by setting the lower anti-loosening component 5, an effective anti-loosening effect can be obtained between the lower joint 2 and the downhole tool connector 4.

[0040] Embodiment 2: Based on embodiment 1, Figure 1 , Fig. 9 , Fig.10 and Fig.11 As shown: it also includes a synchronous lifting component 6, the number of which is two, and the two synchronous lifting components 6 are respectively arranged at the opposite ends of the two anti-loosening components 5; the synchronous lifting component 6 includes an annular sliding plate 601, a T-shaped slide rail 602, an annular limiting plate 603, a buckle installation port 604, an elastic buckle 605 and a rectangular card interface 606, the inner circumference of the annular sliding plate 601 is provided with four T-shaped slide grooves, and each T-shaped slide groove is slidably connected to a T-shaped slide rail 602, and the T-shaped slide rail 602 is fixed on the annular fixed plate 501; the other ends of the four T-shaped slide rails 602 are fixedly connected to the annular limiting plate 603, and the upper end of the annular limiting plate 603 The surface is symmetrical in front and back and is provided with four snap-on installation openings 604, each of which is slidably connected to an elastic snap-on 605, and a spring is installed inside each snap-on installation opening 604; the upper end surface of the annular sliding plate 601 is symmetrical in front and back and is provided with two rectangular snap-on interfaces 606; when the opposite surfaces of the annular sliding plate 601 and the annular limiting plate 603 are in contact with each other, the four elastic snap-ons 605 are respectively engaged with the two rectangular snap-on interfaces 606, so that the plug-in strip 505 can be effectively limited after being pulled out, thereby improving the convenience of the safety release joint during installation and disassembly between the pipe string 3 and the downhole tool connector 4.

[0041] Specific usage and function of this embodiment: In the present invention, when in use, first connect the lower joint 2 to the upper end of the downhole tool connector 4 through threads, then connect the upper end of the upper joint 1 to the pipe column 3 through threads, and then when the upper joint 1 is threadedly connected to the pipe column 3, the rectangular slider 506 in the upper anti-loosening component 5 moves downward with the plug-in strip 505 under the action of the external spring force of the pull rod 507, so that the plug-in strip 505 is plugged into the rectangular plug-in hole 504 in the upper anti-loosening component 5, so that the upper joint 1 and the pipe column 3 are effectively prevented from loosening, and then the lower anti-loosening component 5 is used to effectively prevent the lower joint 2 and the downhole tool connector 4 from loosening.

[0042] Then after going down the well, when it is necessary to release the screw, first put the steel ball 7 into the pipe string 3, then enter the upper joint 1 along the pipe string 3, and finally be at the upper end of the sliding sleeve 9, and then pressurize the pipe string 3 to make the steel ball 7 move downward with the sliding sleeve 9 under the action of pressure, thereby breaking the two shear nails 10. After the two shear nails 10 are broken, the sliding sleeve 9 loses its limiting effect, and then continues to move downward under the action of the thrust and gravity. When the sliding sleeve 9 slides downward to the inside of the lower joint 2, the twenty-four trapezoidal limiting blocks 8 will all lose their limiting effect, and then under the pushing action of the pushing spring 801, they will quickly pop out from the trapezoidal groove 201 and the trapezoidal through hole 101, thereby losing the fixing effect between the lower joint 2 and the upper joint 1, thereby finally realizing the release operation.

Claims

1. A safe and easy-to-operate release joint, comprising an upper joint (1); the lower end of the upper joint (1) is externally slidably connected to a lower joint (2), and the upper end of the upper joint (1) is threadedly connected to a pipe column (3), and the lower end of the lower joint (2) is threadedly connected to the upper end of a downhole tool connector (4); characterized in that: An anti-loosening component (5) is provided between the upper joint (1) and the outside of the pipe column (3), and an anti-loosening component (5) is also provided between the lower joint (2) and the outside of the downhole tool connector (4); the lower end of the interior of the upper joint (1) is fixedly connected to a sliding sleeve (9) via two shear nails (10), and the diameter of the shear nails (10) is 3 mm to 5 mm; a total of 24 trapezoidal limiting blocks (8) are provided on the lower side of the interior of the upper joint (1) and the upper side of the interior of the lower joint (2); a steel ball (7) is placed on the upper end of the sliding sleeve (9) inside the upper joint (1); The lower outer circumference of the upper joint (1) is provided with twenty-four trapezoidal openings (101), and the lower outer circumference of the upper joint (1) is provided with six guide slide bars (102); An annular groove (202) is provided on the upper side of the inner circumference of the lower joint (2), and twenty-four trapezoidal grooves (201) are provided on the inner circumference of the annular groove (202), and trapezoidal limiting blocks (8) are placed inside the twenty-four trapezoidal grooves (201) and the twenty-four trapezoidal openings (101); six strip-shaped sliding grooves (203) are provided on the inner circumference of the annular groove (202); When the lower joint (2) and the upper joint (1) are in an installed state, the six guide slide bars (102) are respectively slidably connected to the six strip-shaped slide grooves (203); The anti-loosening component (5) comprises an annular fixing plate (501), a rectangular sliding cylinder (502), an annular plug plate (503), a rectangular plug hole (504), a plug strip (505), a rectangular sliding block (506) and a pulling rod (507); the annular fixing plate (501) in the upper anti-loosening component (5) is fixedly connected to the lower part of the outer peripheral surface of the pipe column (3), and the annular fixing plate (501) in the lower anti-loosening component (5) is fixedly connected to the upper part of the outer peripheral surface of the downhole tool connector (4); the annular plug plate (503) in the upper anti-loosening component (5) is fixedly connected to the upper part of the outer peripheral surface of the upper connector (1), and the annular plug plate (503) in the lower anti-loosening component (5) is fixedly connected to the A rectangular plug hole (504) is provided on the upper end surface of the annular plug plate (503) connected to the lower portion of the outer circumference of the lower joint (2); two rectangular slide tubes (502) are fixedly connected to one side of the annular fixed plate (501), and a rectangular slider (506) is slidably connected inside each rectangular slide tube (502); a plug strip (505) is fixedly connected to one side of each rectangular slider (506), and a pull rod (507) is fixedly connected to the other side of each rectangular slider (506), and a spring is sleeved on the outside of each pull rod (507) located inside the rectangular slide tube (502); the plug strip (505) and the pull rod (507) respectively pass through the upper and lower ends of the rectangular slide tube (502).

2. A simple-to-operate safety release connector as claimed in claim 1, characterized in that: The lower outer peripheral surface of the upper joint (1) is provided with two shear nail insertion holes A (103), and each shear nail insertion hole A (103) is provided with a shear nail (10) inside.

3. A simple-to-operate safety release connector as claimed in claim 1, characterized in that: When the anti-loosening component (5) is in the anti-loosening state, the head end of the plug-in strip (505) is plugged into the rectangular plug-in hole (504).

4. A simple-to-operate safety release connector as claimed in claim 1, characterized in that: The outer end of the trapezoidal limiting block (8) is fixedly connected to a push spring (801), and the push spring (801) is located inside the trapezoidal groove (201).

5. A simple-to-operate safety release connector as claimed in claim 1, characterized in that: The inner circumferential surface of the sliding sleeve (9) is fixedly connected to the reinforcing cylinder (901) via six reinforcing ribs (902), and two shear nail insertion holes B (903) are provided at the lower portion of the outer circumferential surface of the sliding sleeve (9).

6. A simple-to-operate safety release connector as claimed in claim 1, characterized in that: The invention also comprises a synchronous lifting component (6), wherein the number of the synchronous lifting components (6) is two, and the two synchronous lifting components (6) are respectively arranged at opposite ends of the two anti-loosening components (5); the synchronous lifting component (6) comprises an annular sliding plate (601), a T-shaped sliding rail (602), an annular limiting plate (603), a buckle installation opening (604), an elastic buckle (605) and a rectangular card interface (606); the inner circumference of the annular sliding plate (601) is provided with four T-shaped sliding grooves, and each T-shaped sliding groove has a sliding connection inside. A T-shaped slide rail (602) is connected to and fixed on the annular fixed plate (501); the other ends of the four T-shaped slide rails (602) are fixedly connected to an annular limiting plate (603), and the upper end surface of the annular limiting plate (603) is provided with four snap-fit ​​installation openings (604), each of which is slidably connected to an elastic snap (605), and each of which is installed with a spring; and the upper end surface of the annular sliding plate (601) is provided with two rectangular snap interfaces (606).

7. A simple-to-operate safety release connector as claimed in claim 6, characterized in that: When the opposite surfaces of the annular sliding plate (601) and the annular limiting plate (603) are in contact with each other, the four elastic buckles (605) are respectively engaged with the two rectangular clamping interfaces (606).

Images