SU899821A1 - Well casing pipe - Google Patents

Description

(54) WELL CASE

The invention relates to the construction and relates to equipment for drilling wells for ramming piles, filter columns, tunneling galleries, etc. The well-known casing devices in the form of pipes from welded or flanged links, extracted by means of a crane, vibrator or collar jacks 1. The main disadvantage of these devices is that they require equipment for pulling heavy payloads. The closest in technical essence to the invention is a device including a pipe cut along the length with grooves symmetrically inclined to the pipe axis on its edges, having the possibility of moving the insert with the fingers fixed on it and entering the grooves, as well as clamps for the insert 2. . The disadvantages of the known device are the presence of two vertical rows of fingers, which leads to jamming of the insert during its movement, and the design of the joint does not provide rigidity and tightness of the pipe section, which makes it difficult to remove and reuse it. The purpose of the invention is to increase the reliability of work. The goal is achieved by overlapping the edges of the pipes, and each pair of symmetrically inclined grooves is joined by a common finger. In this case, the transverse size of the casing may be reduced several times and fixed. For this, a V-shaped notch is made in the pipe, aligned with the edge of the inclined groove, while the fingers are mounted with the possibility of being placed in a V-shaped notch. In addition, the angle of inclination of the V-shaped notch to the axis of the pipe is greater than the angle of inclination of the corresponding groove. FIG. 1 shows the device, a general view; in fig. 2 - the same plan; in fig. 3 - groove detail with notches. The length of the pipe 1 has an edge 2 with slots 3 symmetrically inclined relative to the pipe axis. The edge 2 of the pipe is overlapped with the possibility of free movement. Each pair of symmetrically inclined grooves 3 is provided with a common finger 4 attached to the insert 5.

To fix the reduced section of the pipe 1, the grooves 3 have along the upper edge V-shaped notches 6 with an inclination angle to the pipe axis with a larger inclination of the corresponding groove.

When the insert 5 is pulled upwards, the finger 4 moves upward through the slots 3, tightening the edge 2 and reducing the outer contour of the pipe cross section.

Getting into the notches 6, the finger 4 stops and fixes the resulting reduced cross-section of the pipe. Upon further tension of the insert upward, finger 4 emerges from the cut-outs and, moving along the grooves, continues to narrow the casing until it stops at the next cut-off, etc.

The use of the invention facilitates the removal of the casing from the well.

Claims (2)

Claim 1. A well casing pipe comprising a pipe cut along its length with slots symmetrically inclined to the pipe axis and an insert that can be moved with fingers fixed on it and entering the grooves with increased reliability, the pipe is made with V-shaped notches aligned with the edge of the inclined groove, and the edges of the pipes are overlapped, while the fingers are installed with the possibility of placing in the V-shaped notches. 2. A well casing pipe according to claim 1, characterized in that the angle of inclination of the U-shaped notch to the axis of the pipe is greater than the angle of inclination of the groove. Sources of information taken into account in the examination 1. P. A. Anatolyevsky, I. A. Ganichev and Shneerov O. M. Technology of drilling in energy construction. M.-L-, Gosenergoizdat, 1962, p. 59-61. 2 USSR author's certificate No. 377470, cl. E 02 D 7/00, 1973.