RU2231616C1 - Detachable connection of flexible continuous pipes - Google Patents

Abstract

FIELD: boring equipment engineering.

SUBSTANCE: connection includes threaded nipples rigidly connected to ends of connected pipes, and threaded collar. During pipe assembling distance between ends of connected nipples is divisible by screws pitch. For providing for said distance between ends of connected nipples during assembling, connection includes measuring bracket having shelves, which are placed in nipple grooves. Between collar end and end of one of nipples compression spring is placed. Thread on collar and nipples is made one-start or multi-start.

EFFECT: higher durability and impermeability of connection.

3 cl, 2 dwg

Description

The invention relates to drilling equipment and can be used in coiled tubing technology for drilling and repair of oil and gas wells.

Known coiled tubing drilling rig (KBU), including a platform, a drum with a flexible pipe, an injector, hydraulic and other equipment (see, for example, the book S. Weinstock and others. Underground repair and drilling using flexible pipes. M., 1999 )

In all design bureaus, a flexible continuous pipe is used, which provides acceleration of tripping operations and, if necessary, sealing of the well during drilling and tripping of the tool from the well.

The practice of using KBU shows that, as the depth of the wells increases, it is advisable to have composite flexible pipes. In addition, it is necessary to provide for the possibility of removing from the column of flexible pipes of the damaged area with the subsequent connection of the pipes.

A detachable connection of flexible continuous pipes is known - a prototype consisting of threaded nipples rigidly connected to the ends of the pipes to be connected and a threaded sleeve (see, for example, US 2002/0112861 Al, 08/22/2002, E 21 V 19/22).

The disadvantage is that it is difficult to assemble a detachable connection and its tightness is insufficient.

The problem to which the invention is directed, is to create a detachable connection of a flexible continuous pipe, which allows for sectioning to provide a more reliable connection and reduce labor costs with increased tightness.

The solution to the problem is achieved in that in the detachable connection of flexible continuous pipes, consisting of threaded nipples, rigidly connected to the ends of the pipes to be connected, and including a threaded sleeve, when assembling pipes, the distance between the ends of the mating nipples is set to a multiple of the thread pitch, while ensuring the specified distance between the ends of the mating nipples during assembly, the connection includes a measuring bracket having protrusions that are placed in the grooves of the nipples. Between the end face of the clutch and the end face of one of the nipples is placed a compression spring. The threads on the coupling and nipples are single or multi-thread.

The invention is illustrated by drawings. Figure 1 shows the pipes and connection details at the initial time of assembly. Figure 2 shows the connection in the final assembly.

The detachable connection consists of connected flexible pipes 1 and 2, on the end parts of which, by welding, threaded nipples 3 and 4 are installed, which are connected by means of a threaded sleeve 5 with a seal 6. A compression spring 7 is installed between the threaded sleeve 5 and nipple 3, and a measured bracket 8 is installed in the grooves of 9 nipples.

The pipe connection is as follows.

The threaded nipples 3 and 4 are inserted into the end parts of the mating pipes 1 and 2 and fixed in them by welding or mechanically (by press fit or others).

Then, spring 7 is installed on the nipple 3 and the coupling 5 is screwed on.

The connected pipes with nipples are shifted towards each other. The distance between the ends is automatically set using the measuring bracket 8, installed in the grooves 9 of the nipples 3 and 4.

The distance between the grooves 9, equal to m, is selected so that, taking into account the axial dimensions of the parts, to ensure the distance between the ends of S. The value of S, a multiple of the thread pitch of the sleeve 5, ensures that the sleeve 5 connected to the nipple 3 accurately gets into the nipple 4.

The threads on the coupling and nipples are made in the same direction and can be single and multi-start.

Further, the rotation of the coupling moves down to contact with the end face of the nipple 4, and the connection is ready for operation. Disassembly of the connection is carried out in the reverse order. The proposed design has the following features, providing high performance:

1. The outer diameter of the connection does not exceed the outer diameter of the connected pipes.

2. Installation - dismantling of the connection can be carried out at the rig.

3. The design ensures the strength of the connection.

4. The stability of the position of the thread of the coupling is achieved by tightening at the end and the spring force.

The use of threaded self-hardening grease can increase the reliability of the threaded joint.

Claims (3)

1. A detachable connection of flexible continuous pipes, consisting of threaded nipples rigidly connected to the ends of the pipes to be joined, and a threaded sleeve, characterized in that when assembling the pipes, the distance between the ends of the mating nipples is a multiple of the pitch of the threads, while ensuring the specified distance between the ends of the mating nipples during assembly, the connection includes a measuring bracket having protrusions that are located in the grooves of the nipples. 2. The compound according to claim 1, characterized in that between the end of the coupling and the end of one of the nipples placed a compression spring. 3. The compound according to claim 1 or 2, characterized in that the thread on the coupling and nipples is made single or multiple.

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