Limiting nipple

Abstract

The utility model discloses a limiting pup joint which is characterized in that a lower pressure-bearing rotating shaft is formed by connecting an upper pressure-bearing rotating shaft and a lower pressure-bearing rotating shaft; the upper rotating piece comprises an upper protective cap, an upper shell and an upper shaft core assembly; the lower rotating piece comprises a lower protective cap, a lower shell and a lower shaft core assembly; one end of the lower pressure-bearing rotating shaft is connected with the lower shaft core assembly, and the other end is connected with the upper pressure-bearing rotating shaft; one end of the self-locking piece is connected with the lower rotating piece, the other end of the self-locking piece is clamped with the upper rotating piece, the pressure spring sleeves the outer side of the upper pressure-bearing rotating shaft, the pressure spring seat sleeves the outer side of the pressure spring, a female buckle connecting piece is arranged at one end of the pressure spring seat, a lower connecting piece is arranged at the other end of the pressure spring seat, and the lower connecting piece is connected with the lower shell; a male buckle connecting piece is arranged at the end, close to the self-locking piece, of the upper shell and used for being connected with the female buckle connecting piece in a clamped mode. The end, close to the self-locking piece, of the male buckle connecting piece is fixedly connected with the pressure spring. The problem that the limiting short section may fall off in the well logging operation process is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of rotary nipple, specifically is a limit nipple. BACKGROUND

[0002] The role of the rotary nipple in oil logging is very big, for example, in the formation dip angle logging, the cable torsion release makes the rotation of the instrument to bring huge trouble to the calculation of the orientation, and sometimes even the whole data cannot be used, at this time the rotary nipple can make the instrument not follow the cable torsion rotation. Also, for example, in the directional perforation, the rotary nipple can make the perforating gun get rid of the torsion of the cable, and make the perforating bullet perforate in the designed direction under the action of the guide.

[0003] In modern technology, the instrument often meets resistance and gets stuck in the field construction process of oil logging, which is also the engineering problem that has plagued the logging industry so far, and about 80% of the wells can be pulled out by the conventional fishing operation in the stuck accident, but some complex open hole wells and casing deformation engineering wells may be very troublesome, and some even need to be filled in the well, which causes incalculable loss and influence. Therefore, a new limit nipple has become a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0004] The application provides a limit nipple, which comprises:

[0005] A pressure bearing shaft is connected by an upper pressure bearing shaft and a lower pressure bearing shaft;

[0006] An upper rotating part comprises an upper cap, an upper shell and an upper shaft core assembly, the upper cap is connected with the upper shell, and the upper shaft core assembly is arranged in the interior of the upper shell;

[0007] A lower rotating part comprises a lower cap, a lower shell and a lower shaft core assembly, the lower cap is connected with the lower shell, and the lower shaft core assembly is arranged in the interior of the lower shell;

[0008] One end of the upper pressure bearing shaft is connected with the upper shaft core assembly, and the other end is connected with the lower pressure bearing shaft;

[0009] One end of the lower pressure bearing shaft is connected with the lower shaft core assembly, and the other end is connected with the upper pressure bearing shaft;

[0010] A self-locking part is connected with the lower rotating part at one end, and is clamped with the upper rotating part at the other end, and the self-locking part is arranged on the outer side of the pressure bearing shaft;

[0011] The self-locking piece is composed of a compression spring and a compression spring seat, the compression spring is sleeved outside the upper pressure bearing rotating shaft, the compression spring seat is sleeved outside the compression spring, one end of the compression spring seat is provided with a female buckle connecting piece, the other end is provided with a lower connecting piece, and the lower connecting piece is connected with the lower shell.

[0012] One end of the upper shell close to the self-locking piece is provided with a male buckle connecting piece, and the male buckle connecting piece is used for clamping connection with the female buckle connecting piece.

[0013] One end of the male buckle connecting piece close to the self-locking piece is fixedly connected with the compression spring.

[0014] Optionally, the upper shaft core assembly comprises an upper wire terminal block, an upper sealing plug, a slip ring rotor stator, a slip ring connecting flange and an upper bearing seat, and the upper wire terminal block, the upper sealing plug, the slip ring rotor stator, the slip ring connecting flange, the upper bearing and the upper bearing seat are sequentially and sealingly connected, the inside of the upper bearing is provided with the upper pressure bearing rotating shaft, one end of the upper bearing close to the self-locking piece is connected with the upper bearing seat, and the other end of the upper bearing seat is connected with the male buckle connecting piece.

[0015] Optionally, the lower shaft core assembly comprises a lower wire terminal block, a fastening connecting piece 14, a cylindrical helical compression spring 16, a spring connecting seat 17, a lower sealing plug 20, a plug seat 18, a balance oil storage cylinder 5, a compensation piston 29 and a dustproof ring 32, one end of the fastening connecting piece is connected with the lower wire terminal block, the other end is connected with the plug seat, the inside of the plug seat is provided with the lower sealing plug, one end of the lower sealing plug close to the self-locking piece is provided with the balance oil storage cylinder, the lower pressure bearing rotating shaft is connected with the lower sealing plug after penetrating through the balance oil storage cylinder, one end of the balance oil storage cylinder close to the self-locking piece is further provided with the compensation piston 29, the compensation piston is sleeved outside the lower pressure bearing rotating shaft, and the dustproof ring is sleeved at the connection position of the lower pressure bearing rotating shaft and the upper pressure bearing rotating shaft.

[0016] Optionally, the compression spring is a butterfly spring.

[0017] Optionally, one end of the compression spring seat is connected with the balance oil storage cylinder, the other end is provided with a female buckle connecting piece, the female buckle connecting piece is connected with the compression spring, and the female buckle connecting piece is an annular groove.

[0018] Optionally, the male buckle connecting piece is matched with the annular groove of the female buckle connecting piece, so that the female buckle connecting piece and the male buckle connecting piece are clamped.

[0019] Optionally, the male buckle connecting piece is provided with a connecting portion and a protruding portion, the connecting portion is a straight screw rod, one end of the connecting portion is connected with the compression spring, and the other end is connected with the protruding portion.

[0020] The convex part is an annular convex part, and the annular convex part is matched with an annular groove of the female buckle connector, one end of the convex part is connected with the connecting part, and the other end is connected with the upper bearing seat.

[0021] Optionally, the pressure bearing shaft rotates in a clockwise direction.

[0022] The application has the beneficial effect that the limiting nipple is provided with a self-locking part, the self-locking part is composed of a pressure spring and a spring seat, the pressure bearing shaft is sleeved in the pressure spring, when the limiting nipple needs to be self-locked to prevent falling in actual use, a pressure is applied to the upper rotating part, the female buckle connector in the self-locking part is clamped with the male buckle connector at the bottom of the upper rotating part, after clamping, the upper rotating part and the lower rotating part are self-locked, and the purpose of preventing the lower rotating part from falling is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 For;

[0024] In the figure: 1, pressure bearing shaft; 2, upper pressure bearing shaft; 3, lower pressure bearing shaft; 4, upper rotating part; 5, upper protective cap; 6, upper shell; 7, upper shaft core assembly; 8, lower rotating part; 10, lower protective cap; 11, lower shell; 12, lower shaft core assembly; 13, self-locking part; 14, pressure spring; 15, spring seat; 16, female buckle connector; 17, lower connecting part; 18, male buckle connector; 19, upper wire plug-in row; 20, upper sealing plug; 21, slip ring rotor stator; 22, slip ring connecting flange; 23, upper bearing seat; 24, upper bearing; 25, lower wire plug-in row; 26, fastening connecting part; 27, cylindrical helical compression spring; 28, spring connecting seat; 29, compensation piston; 30, lower sealing plug; 31, plug seat; 32, dustproof ring; 33, balance oil storage cylinder; 34, connecting part; 35, convex part. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0026] Please refer to Figure 1 The utility model provides a limiting nipple, which comprises:

[0027] The pressure bearing shaft 1 is connected by an upper pressure bearing shaft 2 and a lower pressure bearing shaft 3.

[0028] The pressure bearing shaft 1 rotates in a clockwise direction.

[0029] An upper rotating part 4, comprising an upper cap 5, an upper shell 6 and an upper shaft core assembly 7, the upper cap 5 and the upper shell 4 are connected, the upper shaft core assembly 7 is arranged inside the upper shell 6;

[0030] A lower rotating part 8, comprising a lower cap 10, a lower shell 11 and a lower shaft core assembly 12, the lower cap 10 and the lower shell 11 are connected, the lower shaft core assembly 12 is arranged inside the lower shell 11;

[0031] The upper shaft core assembly 7 comprises an upper terminal block 19, an upper sealing plug 20, a slip ring rotor stator 21, a slip ring connecting flange 22, an upper bearing 24 and an upper bearing seat 23, the upper terminal block 19, the upper sealing plug 20, the slip ring rotor stator 21 and the slip ring connecting flange 22 are sequentially and sealingly connected, the upper bearing 24 is internally mounted with the upper pressure-bearing rotating shaft 2, the upper bearing 24 is connected with the upper bearing seat 23 away from one end of the self-locking part 13, and the other end of the upper bearing seat 23 is connected with the male buckle connecting part.

[0032] The lower shaft core assembly 12 comprises a lower terminal block 25, a fastening connecting part 2614, a cylindrical helical compression spring 27, a spring connecting seat 28, a lower sealing plug 30, a plug seat 31, a balance oil storage cylinder 33, a compensation piston 29 and a dustproof ring 32, one end of the fastening connecting part 26 is connected with the lower terminal block 25, the other end is connected with the plug seat 31, the lower sealing plug 30 is arranged inside the plug seat 31, the balance oil storage cylinder 33 is arranged on one end of the lower sealing plug 30 close to the self-locking part 13, the lower pressure-bearing rotating shaft 3 is connected with the lower sealing plug 30 after penetrating through the balance oil storage cylinder 33, the compensation piston 29 is further arranged on one end of the balance oil storage cylinder 33 close to the self-locking part 13, the compensation piston 29 is sleeved on the outer side of the lower pressure-bearing rotating shaft 3, and the dustproof ring 32 is sleeved on the connection between the lower pressure-bearing rotating shaft 3 and the upper pressure-bearing rotating shaft 2.

[0033] One end of the upper pressure-bearing rotating shaft 2 is connected with the upper shaft core assembly 7, and the other end is connected with the lower pressure-bearing rotating shaft 3;

[0034] One end of the lower pressure-bearing rotating shaft 3 is connected with the lower shaft core assembly 12, and the other end is connected with the upper pressure-bearing rotating shaft 2;

[0035] It is worth noting that the upper rotating part 4 and the lower rotating part 8 are connected through the pressure-bearing rotating shaft 1, and the pressure-bearing rotating shaft 1 is rotated in the clockwise direction, so that the limiting short section provided by the utility model can drive the lower rotating part 8 to rotate clockwise through the rotation of the pressure-bearing rotating shaft 1, and the downhole detection operation of oil drilling is completed.

[0036] A self-locking piece 13, one end of which is connected with the lower rotating piece 8, the other end of which is clamped with the upper rotating piece 8, and the self-locking piece 13 is sleeved outside the pressure bearing shaft 1;

[0037] The self-locking piece 13 is composed of a pressure spring 14 and a pressure spring seat 15, the pressure spring 14 is sleeved outside the upper pressure bearing shaft 2, the pressure spring seat 15 is sleeved outside the pressure spring 14, one end of the pressure spring seat 15 is provided with a female buckle connecting piece 16, the other end of the pressure spring seat 15 is provided with a lower connecting piece 17, and the lower connecting piece 17 is connected with the lower shell 8.

[0038] The pressure spring 14 is selected from a butterfly spring.

[0039] One end of the pressure spring seat 15 is connected with the balance oil storage cylinder 33, the other end of the pressure spring seat 15 is provided with a female buckle connecting piece 16, the female buckle connecting piece 16 is connected with the pressure spring 14, and the female buckle connecting piece 16 is an annular groove.

[0040] One end of the upper shell 6 close to the self-locking piece 13 is provided with a male buckle connecting piece 18, and the male buckle connecting piece 18 is used for clamping with the female buckle connecting piece 16.

[0041] One end of the male buckle connecting piece 18 close to the self-locking piece 13 is fixedly connected with the pressure spring 14.

[0042] The male buckle connecting piece 18 is matched with the annular groove of the female buckle connecting piece 16, so that the female buckle connecting piece 16 and the male buckle connecting piece 18 are clamped.

[0043] The male buckle connecting piece 18 is provided with a connecting part 34 and a protruding part 35, the connecting part 34 is a straight screw rod, one end of the connecting part 34 is connected with the pressure spring 14, and the other end of the connecting part 34 is connected with the protruding part 35.

[0044] The protruding part 35 is an annular protrusion, the annular protrusion is matched with the annular groove of the female buckle connecting piece 16, one end of the protruding part 35 is connected with the connecting part 34, and the other end of the protruding part 35 is connected with the upper bearing seat 23.

[0045] It needs to be explained that the female buckle connector 16 and the male buckle connector 18 in the self-locking piece 13 need artificial external force to exert a pressure, in the utility model, the upper rotating piece 4 is at the upper end, the lower rotating piece 8 is operated in the well, the artificial external force is exerted on the upper protective cap 5 of the upper rotating piece 4, the exerted pressure is transmitted to the male buckle connector 18 layer by layer from the upper protective cap 5, the male buckle connector 18 is buckled into the female buckle connector 16 after receiving the pressure, namely, the convex part 35 is clamped into the annular groove inside the female buckle connector 16, the self-locking piece 13 is completed self-locking, and the self-locking piece 13 is fixedly connected with the balance oil storage cylinder 33 on the lower rotating piece 8, therefore, the lower rotating piece 8 is formed locking, and the upper rotating piece 4 does not fall off in the process of fishing operation.

[0046] The above is only a few embodiments of the application, and does not limit the application in any form. Although the preferred embodiments are disclosed above, the application is not limited thereto. Any person skilled in the art can make some changes or modifications to the disclosed technical content without departing from the scope of the application, and such changes or modifications are equivalent to equivalent embodiments, and are within the scope of the technical solution.

Claims

1. A length limiter pup joint, characterized in that, The utility model relates to a kind of pressure-bearing rotating shafts, which comprises: Pressure-bearing rotating shaft (1) is connected by upper pressure-bearing rotating shaft (2) and lower pressure-bearing rotating shaft (3); Upper rotating part (4) includes upper cap (5), upper shell (6) and upper shaft core assembly (7), upper cap (5) and upper shell (6) are connected, and upper shaft core assembly (7) is arranged inside upper shell (6); Lower rotating part (8) includes lower cap (10), lower shell (11) and lower shaft core assembly (12), lower cap (10) and lower shell (11) are connected, and lower shaft core assembly (12) is arranged inside lower shell (11); One end of the upper pressure-bearing rotating shaft (2) is connected with the upper shaft core assembly (7), and the other end is connected with the lower pressure-bearing rotating shaft (3); One end of the lower pressure-bearing rotating shaft (3) is connected with the lower shaft core assembly (12), and the other end is connected with the upper pressure-bearing rotating shaft (2); Self-locking part (13) is connected with the lower rotating part (8) at one end, and is clamped with the upper rotating part (4) at the other end, and the self-locking part (13) is sleeved outside the pressure-bearing rotating shaft (1); The self-locking part (13) is composed of pressure spring (14) and pressure spring seat (15), the pressure spring (14) is sleeved outside the upper pressure-bearing rotating shaft (2), the pressure spring seat (15) is sleeved outside the pressure spring (14), one end of the pressure spring seat (15) is provided with female buckle connecting piece (16), and the other end is provided with lower connecting piece (17), and the lower connecting piece (17) is connected with the lower shell (11); The upper shell (6) is provided with male buckle connecting piece (18) at one end close to the self-locking part (13), and the male buckle connecting piece (18) is used for clamping with the female buckle connecting piece (16); The male buckle connecting piece (18) is fixedly connected with the pressure spring (14) at one end close to the self-locking part (13).

2. The length-limited short according to claim 1, characterized in that The upper shaft core assembly (7) includes upper plug-in wire row (19) 11, upper sealing plug (20), slip ring rotor stator (21) 52, slip ring connecting flange (22), upper bearing (24) and upper bearing seat (23), the upper plug-in wire row (19) 11, the upper sealing plug (20), the slip ring rotor stator (21) and the slip ring connecting flange (22) are sequentially sealed and connected, the upper bearing (24) is internally mounted the upper pressure-bearing rotating shaft (2), the upper bearing (24) is connected with the upper bearing seat (23) at one end away from the self-locking part (13), and the other end of the upper bearing seat (23) is connected with the male buckle connecting piece.

3. A length limiter according to claim 2, wherein The lower shaft core assembly (12) comprises a lower wiring distribution board (25), a fastening connecting piece (26) 14, a cylindrical helical compression spring (27) 16, a spring connecting seat (28) 17, a lower sealing plug (30) 20, a plug seat (31) 18, a balance oil storage cylinder (33) 5, a compensation piston (29) and a dustproof ring (32), one end of the fastening connecting piece (26) is connected with the lower wiring distribution board (25), the other end is connected with the plug seat (31), the inside of the plug seat (31) is provided with the lower sealing plug (30), one end of the lower sealing plug (30) close to the self-locking piece (13) is provided with the balance oil storage cylinder (33), the lower pressure bearing shaft (3) is connected with the lower sealing plug (30) after penetrating through the balance oil storage cylinder (33), one end of the balance oil storage cylinder (33) close to the self-locking piece (13) is further provided with the compensation piston (29), the compensation piston (29) is sleeved on the outside of the lower pressure bearing shaft (3), and the dustproof ring (32) is sleeved on the connection between the lower pressure bearing shaft (3) and the upper pressure bearing shaft (2).

4. The length-limited short according to claim 3, characterized in that The pressure spring (14) is selected to be a butterfly spring.

5. The length-limited short according to claim 4, characterized in that One end of the pressure spring seat (15) is connected with the balance oil storage cylinder (33), the other end is provided with a female buckle connecting piece (16), the female buckle connecting piece (16) is connected with the pressure spring (14), and the female buckle connecting piece (16) is an annular groove.

6. A length limiter according to claim 5, wherein The male buckle connecting piece (18) is matched with the annular groove of the female buckle connecting piece (16), so that the female buckle connecting piece (16) and the male buckle connecting piece (18) form a clamping connection.

7. A length limiter according to claim 6, wherein The male buckle connecting piece (18) has a connecting part (34) and a protruding part (35), the connecting part (34) is a straight screw rod, one end of the connecting part (34) is connected with the pressure spring (14), and the other end is connected with the protruding part (35); The protruding part (35) is an annular protrusion, and the annular protrusion is matched with the annular groove of the female buckle connecting piece (16), one end of the protruding part (35) is connected with the connecting part (34), and the other end is connected with the upper bearing seat (23).

8. The length-limited short according to claim 7, characterized in that The pressure bearing shaft (1) rotates in the clockwise direction.

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