SU1594259A1 - Method of assembling coupling casings into string - Google Patents

Abstract

The invention relates to the construction of wells. The goal is to simplify the assembly of the field threaded pair of casing sleeves. In the factory, the clutch is screwed with the pipe until the torque increases to the minimum acceptable level. A longitudinal mark is then applied in the form of a strip intersecting the sleeve and the pipe. The width of the strip corresponds to the range of allowable increase in the magnitude of the torque. When running the casing, the threaded connection of the coupling is screwed with the pipe until the marking strip parts located on the surface of the pipe and coupling from the factory end of the line begin to move relative to each other. A connection is considered normal if its offset value does not exceed the width of the label strip. 2 Il.

Description

The invention relates to the construction of wells and can be used in the assembly of threaded connections in the process of running casing.

The aim of the invention is to simplify

assembling a field threaded pair of casing pipes with a factory threaded pair.

FIG. Figure 1 shows a schematic of an implementation method for assembling casing linings into a column prior to screwing a field thread; in fig. 2 - the same, after screwing.

The method of assembling the sleeve casing into the string is carried out as follows.

When screwing with the minimum allowable torque ww of the factory threaded pair 1, the tube 2 and the sleeve 3 are applied, respectively, to the longitudinal marks 4 and 5, forming a straight strip widening, the size of which determines the amount of twisting of the threaded joint when the coolant changes. right moment from the minimum to the maximum allowable.

When assembling the field threaded pair 6 (Fig. 2), the lower tube 2 is fixed. The threaded end of the upper tube 7 is inserted into the coupling 3 from the side of the free end and, applying an increasing moment, screw up until the part of the mark 5 located on the coupling, relative to the portion of the mark 4 located on the tube, does not move. In this case, the displacement b must not exceed the width of the strip a of the longitudinal mark.

Example. A casing coupling pipe with a diameter of 244.5 mm and a wall thickness of 11.99 mm of the C-75 grade with a VAM threaded connection with a minimum allowable torque of 147JO Hm is screwed at the factory. The maximum allowable torque for this connection is 17660 Nm. and the width of the tag a is 17 mm. The total length of the mark applied at the factory is 100 mm, of which 50 mm are located on the coupling and 50 mm on the pipe. When assembling the casing in field conditions into the coupling from the side

with liu to cd

with

The threaded end of the pipe is inserted into the long end and screwed together until the parts of the mark B are displaced to the boundaries of the width of the mark strip.

Simplifying the casing assembly process in field conditions reduces its labor intensity and also increases the reliability of threaded connections.

Claims (1)

Invention Formula  The method of assembling the coupling casing; in the column, which includes the application of a longitudinal i mark on the pipe and sleeve, their fitting and determination of the moment of termination; relative positioning parts of the longitudinal mark on the pipe and sleeve, characterized in that, in order to simplify the assembly of the field threaded pair of casing pipes with the factory threaded pair, the longitudinal mark is applied from the factory threaded pair after screwing it with the minimum allowable torque, the mark width is performed equal to the amount of rotation of the threaded joint when the torque value changes from the minimum to the maximum allowable, and the moment of stopping the screwing of the fishing pair is judged by the relative displacement of parts weave,. located on the side of the factory threaded pair on the pipe and coupling, by an amount not exceeding the width of the label. 7 fig.g