CN214532830U

CN214532830U - Lower joint structure for double-tube plugging tool

Info

Publication number: CN214532830U
Application number: CN202120662907.XU
Authority: CN
Inventors: 刘中平; 崔志蕊
Original assignee: Daqing Yike Petroleum Technology Development Co ltd
Current assignee: Fuxin lingchuang mechanical equipment manufacturing Co.,Ltd.
Priority date: 2021-04-01
Filing date: 2021-04-01
Publication date: 2021-10-29
Anticipated expiration: 2031-04-01

Abstract

The utility model belongs to the oil field instrument field in the pit especially relates to a lower clutch structure for in double-barrelled shutoff instrument, including outer joint, nipple, outer oil pipe and inlayer oil pipe, the upper end of outer joint and outer oil pipe is passed through standard oil pipe threaded connection and is sealed, and the nipple cartridge is in the inboard of inlayer oil pipe upper end to it is sealed through O type sealing washer, the outside processing of nipple has the radial connecting thread of tooth form for right angled triangle and right angled triangle's a right angle border nipple, is called the joint external screw thread, inlayer oil pipe's inboard processing has the annular groove, is called the fastener mounting groove, installs C-shaped fastener in the fastener mounting groove, the inboard processing of C-shaped fastener have with the joint internal thread that the joint external screw thread matches. The utility model discloses in, adopted special connection structure between nipple and the inlayer oil pipe, can make inlayer oil pipe's junction possess sufficient bearing capacity and tensile strength.

Description

Lower joint structure for double-tube plugging tool

Technical Field

The utility model belongs to the oil field instrument field in the pit especially relates to a lower clutch structure that is arranged in double-barrelled shutoff instrument.

Background

The double-pipe plugging tool is a novel oilfield downhole tool, the lower end of the tool is provided with an inner joint and an outer joint, and a liquid passing interlayer for flowing media is reserved between the inner joint and the outer joint. When the oil pipe joint is installed, the inner joint and the outer joint need to be connected to the inner oil pipe and the outer oil pipe respectively, so that the liquid passing interlayer extends downwards. In order to facilitate installation, in the prior art, the outer joint is in threaded connection with the outer oil pipe through a standard oil pipe, and the inner joint is sealed with the inner oil pipe through insertion. The disadvantages of this connection are: after the connection is finished, the inner oil pipe cannot bear tensile load, so that the overall tensile strength of the pipe column is greatly reduced. Therefore, it is necessary to design a new lower joint structure to improve the tensile strength of the pipe string.

Disclosure of Invention

The utility model provides a lower clutch structure for in double-barrelled shutoff instrument to solve the problem that proposes in the above-mentioned background art.

The utility model provides a technical problem adopt following technical scheme to realize: the utility model provides a lower joint structure for in double-barrelled shutoff instrument, including outer joint, inner joint, outer oil pipe and inlayer oil pipe, the upper end of outer joint and outer oil pipe is through standard oil pipe threaded connection and sealed, and the inner joint cartridge is in the inboard of inlayer oil pipe upper end, and seals through O type sealing washer, the radial connecting thread of tooth form right angled triangle and right angled triangle's a right angle border inner joint is processed to the outside of inner joint, is called the joint external screw thread, the inboard of inlayer oil pipe is processed annular groove, is called the fastener mounting groove, installs C shape fastener in the fastener mounting groove, the inboard processing of C shape fastener have with the joint internal thread that the joint external screw thread matches;

an anti-rotation pin for preventing the C-shaped clamping piece from rotating is arranged on the inner-layer oil pipe at a position corresponding to the C-shaped clamping piece;

and the side surface of the upper end of the outer oil pipe is fixedly provided with a connecting pin, and the tail end of the connecting pin is inserted into the outer surface of the inner oil pipe, so that the outer oil pipe and the inner oil pipe are connected together.

As a further technical scheme, the sealing ring is installed in a sealing groove on the inner side of the inner oil pipe, the cross section of the sealing groove is in an isosceles trapezoid shape, and the upper bottom of the isosceles trapezoid faces the inner side of the inner oil pipe.

As a further technical scheme, the screwing directions of the clamping external thread and the clamping internal thread are the same as that of the standard oil pipe thread, but the thread pitch is larger than that of the standard oil pipe thread.

The utility model has the advantages that: the utility model discloses in, special connection structure has been adopted between nipple and the inlayer oil pipe, and this kind of connection structure has two aspects effect: on one hand, based on the connection mode of the C-shaped clamping piece, the joint of the inner layer oil pipe can have enough pressure bearing capacity and tensile property; on the other hand, the rotation directions of the clamping external thread and the clamping internal thread are the same as the rotation direction of the standard oil pipe thread, but the thread pitch is larger than the standard oil pipe thread, so that the inner layer oil pipe can have certain pre-tightening tension after being connected, the phenomenon that the inner layer oil pipe creeps after bearing pressure is avoided, and the connection performance of the connection part is further improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1.

In the figure: 1. an outer joint; 2. an inner joint; 3. an outer oil pipe; 4. c-shaped clamping pieces; 5. an anti-rotation pin; 6. an inner oil pipe 7 and a connecting pin; 8. clamping the external thread; 9. clamping the internal threads; 10. a clamping piece mounting groove; 11. an O-shaped sealing ring.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in fig. 1, the present embodiment includes an outer joint 1, an inner joint 2, an outer oil pipe 3 and an inner oil pipe 6, the upper ends of the outer joint 1 and the outer oil pipe 3 are connected and sealed by a standard oil pipe thread, and the inner joint 2 is inserted into the inner side of the upper end of the inner oil pipe 6 and sealed by an O-ring 11. The above is the structure existing in the prior art, and is not described in detail herein.

As shown in fig. 1 and 2, a radial connecting thread with a right-angled triangle tooth shape and a right-angled triangle edge of the inner joint 2 is processed on the outer side of the inner joint 2 and is called a clamping external thread 8, an annular groove is processed on the inner side of the inner layer oil pipe 6 and is called a clamping piece mounting groove 10, a C-shaped clamping piece 4 is mounted in the clamping piece mounting groove 10, and a clamping internal thread 9 matched with the clamping external thread 8 is processed on the inner side of the C-shaped clamping piece 4. During the installation, peg graft with the whole and double-deck oil pipe of instrument, during the grafting, nipple 2 will from the inboard C shape fastener 4 struts to insert the inboard of C shape fastener 4, link together nipple 2 and C shape fastener 4 under the mating reaction of joint internal thread 9 and joint external screw thread 8 then, so that make nipple 2 can't deviate from the inboard of C shape fastener 4 when bearing tensile load.

As shown in fig. 1, an anti-rotation pin 5 for preventing the C-shaped clamping piece 4 from rotating is arranged on the inner layer oil pipe 6 at a position corresponding to the C-shaped clamping piece 4. Through carrying out circumference spacing to C shape fastener 4, the accessible makes nipple 2 and inlayer oil pipe 6 break away from in the mode of rotatory inlayer oil pipe 6.

As shown in fig. 1, a connecting pin 7 is fixedly installed on a side surface of an upper end of the outer oil pipe 3, and a distal end of the connecting pin 7 is inserted into an outer surface of the inner oil pipe 6, thereby connecting the outer oil pipe 3 and the inner oil pipe 6 together. The connecting pin 7 and the C-shaped clamping piece 4 can bear tensile load together, and the tensile strength of the connecting part can be further improved.

As shown in fig. 1, as a further technical solution, the sealing ring is installed in a sealing groove on the inner side of the inner oil pipe 6, the cross section of the sealing groove is an isosceles trapezoid, and the upper bottom of the isosceles trapezoid faces the inner side of the inner oil pipe 6. The sealing groove structure can prevent the O-shaped sealing ring 11 from falling off in the transferring and mounting processes.

As shown in figure 1, as a further technical scheme, the screwing directions of the clamping external thread 8 and the clamping internal thread 9 are the same as that of the standard oil pipe thread, but the thread pitch is larger than that of the standard oil pipe thread. The design can ensure that the inner layer oil pipe 6 has certain pre-tightening tension after being connected, and the phenomenon that the inner layer oil pipe 6 creeps after bearing pressure is avoided, so that the connection performance of the connection part is further improved.

Claims

1. The utility model provides a lower clutch structure for in double-barrelled shutoff instrument, includes external joint (1), nipple (2), outer oil pipe (3) and inlayer oil pipe (6), and standard oil pipe threaded connection is passed through and is sealed in the upper end of external joint (1) and outer oil pipe (3), and nipple (2) cartridge is in the inboard of inlayer oil pipe (6) upper end to it is sealed through O type sealing washer (11), its characterized in that: the outer side of the inner joint (2) is processed with a radial connecting thread which is in the shape of a right-angled triangle and one right-angled edge of the right-angled triangle along the inner joint (2), the radial connecting thread is called a clamping external thread (8), the inner side of the inner layer oil pipe (6) is processed with an annular groove which is called a clamping piece mounting groove (10), a C-shaped clamping piece (4) is mounted in the clamping piece mounting groove (10), and a clamping internal thread (9) matched with the clamping external thread (8) is processed on the inner side of the C-shaped clamping piece (4);

an anti-rotation pin (5) for preventing the C-shaped clamping piece (4) from rotating is arranged on the inner layer oil pipe (6) at a position corresponding to the C-shaped clamping piece (4);

and a connecting pin (7) is fixedly installed on the side surface of the upper end of the outer oil pipe (3), and the tail end of the connecting pin (7) is inserted into the outer surface of the inner oil pipe (6), so that the outer oil pipe (3) and the inner oil pipe (6) are connected together.

2. A lower adapter structure for use in a dual tube plugging tool according to claim 1, wherein: the sealing ring is installed in a sealing groove on the inner side of the inner oil pipe (6), the cross section of the sealing groove is isosceles trapezoid, and the upper bottom of the isosceles trapezoid faces the inner side of the inner oil pipe (6).

3. A lower adapter structure for use in a dual tube plugging tool according to claim 1, wherein: the rotating directions of the clamping external thread (8) and the clamping internal thread (9) are the same as the rotating direction of the standard oil pipe thread, but the thread pitch is larger than that of the standard oil pipe thread.