SU727837A1 - External tool for fishing for tubes - Google Patents

Description

The invention relates to mining, in particular, to fishing tools, and can be used to extract drill pipes left in wells as a result of an accident.

The outer trubol is known, comprising a housing and a sleeve, the inner surface of the housing being cylindrical, transforming into a conical one, and the fishing sleeve has an outer surface of a cylindrical shape, which becomes conical l.

The disadvantage of this device is the inability to create significant efforts to securely clamp and grip the pipe.

The closest solution of the known ones is an outer trubolovka, comprising a housing with an inner conical surface and a gripping element placed inside it from the outside. Noah conical surface in the lower part 2j

The disadvantage of this technique is the low reliability of the capture and extraction of drill pipes.

The purpose of the present invention is to increase the reliability of gripping and extracting drill pipes.

This goal is achieved by the fact that the gripping element is designed as a split ring, and the inner surface of the body above the conical surface is oval-shaped.

FIG. 1 is a longitudinal section of the die; in fig. 2 is a schematic representation of a trap and an effort, which is acted upon by a gripper} in FIG. 3 - section A-A of FIG. 1, at the start of the pipe gripping process; in fig. 4 - the same, the intermediate overlay pipe / yvki in the process of seizing the pipe; FIG. 5 is the same, the final position of the crown.

The cap is made as follows. Inside the housing 1 is placed the gripping element 2, made in. the form of a split ring, the outer BOSPHOCTb of which has a cylindrical shape, transforming into a conical inner surface of the corgus; parts of the split ring. The inner diameter of the gripping element 2 is usually made equal to 0.90 0.98 of the outer diameter of the pipe. A notch is made on the inner, cylindrical surface of the gripping element 2. In the upper part, the housing 1 is connected with an adapter 3 for connecting to the drill pipe string (conventionally not shown in the drawing) on which the die falls into the C1 slat. The adapter 3 has a weak link 4. The operation of the die is carried out in the following sequence. The pipe through adapter 3 is connected to the drill pipe string and lowered into the well. When the pipe 5, which remains in the well after the break, is reached, the lower cone of the housing 1 centers the pipe 5 inside the housing. With further descent of the gripping element 2, the contact with the end surface of the pipe 5 moves up to the stop in the adapter 3 and expands under the weight of the column a) 1, it covers the upper edge of the tubular pipe 5. In this case, the outer part of the split ring takes the shape close to oval. In this case, the axis of the drill pipe is shifted relative to the larger axis of the oval sideways to the section of the gripping element 2 by the value B, which at the initial moment of capture is equal to:; , L-ORV- 2. 2 - the outer diameter of the drill pipe; d is the inner diameter of the split sleeve; T) “the effective diameter of the bushing; - 0.8-1.0. In this position, the teeth of the notch and the inner surface of the gripping element are not inserted into the body of the pipe, so that the forces of the ytpyrccTH need for this purpose are precisely Nydost. By setting it so (om pipe .727837

Claims (2)

4 dexterous, the hull turn begins. The mutual arrangement of the body and the gripping element after turning to a certain angle is shown in FIG. 4; In this case, a compressive force begins to act on the gripping element and the teeth will begin to be inserted into the body of the pipe. The axis of the drill pipe is close to the axis of the oval. In the final position after turning {fig. 5) when the housing is turned 90 axis of the pipe is aligned with the axis of the housing. The teeth are inserted into the body of the pipe, and the pipe itself is tightly clamped by the gripping element. And only after the pipes are clamped, the ascent begins. Lane: Only body 1 connected to adapter 3 is initially raised. After the entire clearance is selected and the body of the gripping element 2 is firmly inserted into the cone of body 1, lifting begins from the well of the broken end of the drill pipe. The release of the trap in case of impossibility of curing the pipes remaining in the well, is pro- | comes by breaking the weak link 4, Pipe 2 increases reliability,. Removing the drill pipe from the borehole, as the force that clamps the pipe in the die increases, especially the increased reliability of the pipe work at the initial moment of lifting the pipes. Claims of the invention An outer sleeve comprising a housing with an inner conical surface and a gripping element disposed therein with an outer conical surface in the lower part, about a ton, and so as to increase the reliability of gripping and removing the drill pipes; the gripping element is made in the form of a split ring, and the inner surface of the body above the conical surface is oval-shaped. Sources of information,. taken into account during the examination 1. USSR author's certificate No. 305253, cl. Е 21 В 31 / ОО, 1969. 2. USSR Author's Certificate No. 549572, class, E 21 V 31/02, 1972. 727837 TP2 LUFIG. Aa FIG. FIG. Aa fe.5