UA76510U - Through-type outer tubing catch - Google Patents

Abstract

A through-type outer tubing catcher comprises cylindrical body with switch in the upper section and cone in the lower section, collet with catch holders in the lower section installed inside the body, and a cone with tightening element. Inside the body a spring-loaded centering bushing is additionally installed, and the collet is equipped with tightening ring for sealing inner space of the tubing catch if it is needed to carry out circulation of washing fluid.

Description

The useful model belongs to the oil and gas production industry, in particular to a fishing tool for capturing and extracting from the well an emergency string of couplingless long pipe (BDT).

For the extraction of pipes from the well, the well-known external pipe trap is released (Preduprezhdenie i likvidatsiya avarivy v bureniyi. Pustovoytenko I.P. - M.: Nedra, 1988. - p. 172), which consists of a housing with a conical surface in the lower inner part of the housing for the movement of dies and with a pipe cut at its ends for connecting a watering can. In the case, two keys are pressed into special grooves, between which are placed dies with an internal left-handed catch. A ring and a rubber cuff and a pressure sleeve with a spiral are installed in the upper part of the dies.

The disadvantage of such a device is the insufficient sealing of the space between the device body and the emergency pipe, which does not allow for enhanced circulation of the flushing fluid to release stuck pipes, as well as the unreliability of releasing the device from emergency pipes in the well.

The closest to the claimed device is an external pipe trap that is released (AS USSR Mo 549572, MPK? Е21В 31/02, publ. 05.03.1977, bull. Mo 9), in which the lower part of the case has an annular groove to accommodate the cone. The protrusion at the bottom of the spindle is designed to limit the movement of the sleeve with the collet. The spindle has sockets for the key and a hole for pumping the washing liquid. The bushing has an external thread, and the groove under the key ensures free movement of the bushing along the spindle and transmission of torque to the collet.

The disadvantages of this pipe trap include the fact that the design of its parts allows capturing, sealing at the connection point and extracting pipes of only one diameter, that is, for each pipe diameter, it is necessary to use a pipe trap of the appropriate size, which requires significant costs for the manufacture and carrying out of fishing operations. In addition, the construction of individual parts (collets, cones, funnels) is metal-intensive and complex.

The useful model is based on the task of simplifying the design and expanding the operational capabilities of the pipe trap passing through the external emergency column for the extraction of the coupling-less long pipe.

The task is solved by the fact that the pipe trap, which contains a cylindrical body with a converter in the upper part and a funnel in the lower part, is installed in the middle of the body

From a collet with catch grippers in the lower part and a cone with a sealing element, according to the useful model, a spring-loaded centering sleeve is additionally installed in the middle of the body, and the collet is equipped with a sealing ring.

The introduction of a centering sleeve into the structure of the pipe trap made it possible to solve the problem of unobstructed passage through the internal cavity of the pipe trap of the emergency BDT, which forms a spiral at the point of rupture, which makes it difficult to capture and remove it from the well.

Installation of the sealing ring makes it possible to seal the inner space of the pipe trap during the circulation of the flushing liquid.

In addition, the device has a simplified design of a cone and a funnel with flat ends without protrusions towards the sealing element and their design is not interconnected with the dimensions of the sealing element. At the same time, the design of the cone and guide funnel is simplified: they become less metal-intensive, while in the prototype, for each size of pipes, the cone and funnel must be made according to the size of the removed pipes.

The essence of the proposed technical solution is explained by the drawings in which in fig. 1 shows the general view of the external pipe trap, in fig. 2 - section of the pipe trap along A - A in Fig. 1.

The proposed external pipe trap contains a transducer 1, which is connected to the housing 2 by a hinge. Inside the housing, a spring-loaded centering sleeve 3 is installed, which is pressed by a spring 4 to the upper turn of the housing.

In the lower recess of the housing, a cone 5 is installed, on which the collet 6 rests, which has fishing grippers in the lower part, which in the process of fishing interact with the outer surface of the BDT emergency column, and in the upper part, on the outer surface of the collet, a sealing ring 7 is installed, which seals the gap between the collet and the inner surface of the case.

The permanent contact of the collet b with the cone 5 is ensured by the spring 8. To exclude the overflow of the washing liquid, a sealing element 9 is installed under the cone.

The position of all parts in the case is fixed by funnel 10.

The principle of operation of the external pipe trap is as follows.

If it is necessary to remove the caught BDT, its outer diameter is determined. A collet, a sealing element and a centering sleeve are selected according to its size. Then the pipe trap is assembled, placing the parts as shown in the drawing, connected to the column of pump-60 compressor pipes and lowered into the well.

During the lowering of the pipe trap, the emergency BDT passes through the pipe trap, while the end of the emergency BDT rests against the catch grips of the collet, the inner diameter of which is 1-2 mm smaller than the diameter of the emergency BDT, which is removed.

When the pipe trap is further lowered, the collet, compressing the spring, rises along the cone and the catch grips of the collet move apart and pass the emergency BDT inside. Rising along the inner surface of the pipe trap, the end of the emergency BDT passes through the centering sleeve of the pipe trap, rising along the inner surface of the tubing.

In this way, when lowering a column of tubing with a passing pipe trap, it is possible to reach the place of catching emergency BDTs.

When the pipe catcher moves upwards, the collet grabs the BDT with its catching grips, which allows emergency pipes to be removed. If necessary, the design of the external pipe trap allows flushing the well to eliminate the sticking of the emergency BDT.

The use of the presented external pipe trap allows you to expand the scope of its use, that is, to increase the range of pipe sizes that are removed, by using only a few sets of interchangeable parts for the appropriate pipe size.

For example, in the presence of two interchangeable sets of seals and centering bushings and 4 sets of collets, it is possible to grab and remove emergency BDTs of 4 diameters (from 19.1, 25.4 to 38.1 mm), while saving metal and labor costs less than 5-6 times.

All this ultimately leads to a reduction in the cost of fishing operations and the possibility of abandoning the production of a larger number of pipe traps.

At the same time, the reliability of the pipe traps also increases due to the simplification of the design.

Claims (1)

USEFUL MODEL FORMULA The through pipe trap is external, containing a cylindrical body with a guide in the upper part and a funnel in the lower part, a collet with catching grippers in the lower part and a cone with a sealing element are installed in the middle of the body, which is distinguished by the fact that a spring-loaded centering sleeve is additionally installed in the middle of the body. and the collet is equipped With a sealing ring for sealing the inner space of the pipe trap if it is necessary to circulate the washing liquid.