SU1738924A1 - Method for casing pullout - Google Patents

Abstract

Using; in construction and mining, specifically in devices for casing, it allows to increase work efficiency and reduce labor costs for the process of extracting a pipe from the soil. SUMMARY OF THE INVENTION: The device is lowered into the casing 19 on the cable suspension 13 connected to the rod 4, in the lower part of which there is a lifting cam 7 on the axis 6. The rod is placed in the cavity of the housing 1 having a taper 3, a load-carrying axis 9 and a turning one axis 10; In the middle part of the housing 1 there is a ring 14 connected to the stem 4 by flexible links 18. To the ring 14 are taper-connected dies 17, 5 or more. THX

Description

The invention relates to the construction and mining industries, namely, devices for extracting casing pipes of medium and large diameter from soil.

The purpose of the invention is to increase the efficiency of the device in operation and reduce labor costs in the process of extracting pipes. .

Figure 1 shows the proposed device in the position of the descent or idle rise; Figure 2 is the same in the casing extraction position; on fig.Z - scheme of the autotrop; figure 4 - section aa on fig.Z; figure 5 - section bb in fig.Z.

The casing extraction device includes a housing 1, the upper part 2 of which is made with a hollow sectional section, and a cone 3 is rigidly connected to the lower part of the body cavity with the possibility of translational movement and fixed from rotation, the rod 4 is installed with a groove 5 on the lower end, in which On the axis 6, the load gripping cam 7 is rotatably mounted. In order to avoid the inertial run out, a rubber ring 8 is placed between the cam 7 and the axis 6 (see Fig. 4). In the hollow part of housing I, the load-carrying axle 9 and the rotary axle 10 are also fixed.

The rod 4 is connected via an axis 11 and a working socket 12 to a cable suspension 13 connected to a lifting mechanism — crane, hydraulic cylinders, etc. (not shown).

In the middle part of the housing 1 with a possibility of limited axial movement, a ring 14 is installed with grooves 15, in which the axes 16 of the plates 17 are placed, having the possibility of both angular rotation on the axes 16 and some radial movement relative to the axis of the device XI CJ 00

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with axes 16. The ring 14 and the stem 4 are interconnected by flexible links 18,

A casing extraction device operates as follows.

The cable suspension device 13 is lowered into the pipe 19 to be removed, while the rod 4 is in its extreme upper position and with the help of flexible links 18 and ring 14 holds the die 17 also in its extreme upper position, where a gap is formed between them and the casing 19 allowing free descent or idling of the device. The load gripping cam 7 is in the vertical position 20 (see Figures 1 and 3).

After the device is installed on the bottom of the well, directly by the body 1 or by means of a thrust rod (not shown) connected to the body, the cable suspension 13 is slacked, and all moving parts of the device continue to fall when the body 1 is stationary. 19 without a gap, and the rod 4 continues to descend until the cam 7 is in contact with the pivot axis 10 (the load carrying shaft is 9), as a result of which the cam 7 rotates through a certain angle and occupies the position 21 (see fig. 3).

During the subsequent lifting of the rod 4, the cam 7 rotated at a certain angle touches the load-carrying axis 9, grips it, turns to position 22 (see Fig. 2), and the housing 1 starts to lift up at some weak link of the flexible links 18. The rails 17 are wedged between a cone 3 and a pipe 19, and due to the installation of the axes 16 in the slots 15, the optimal position of the plates 17 is chosen, in which they all adhere to the casing 19 with the entire outer surface, without deforming it when maximum loads are applied.

By applying force to the cable sling 13, the tubing is removed to the surface with periodic disassembly of it through the joints into separate tubes.

If the force of the lifting mechanism is not enough to remove the pipe, the device is removed to the surface, for which cable suspension 13 is again attached

the slack, the rod 4 goes down and the cam 7 at position 22 is in contact with the pivot axis 10 and rotates into a horizontal position 23. When the rod 4 is subsequently raised, the cam 7 comes into contact with

the load-carrying axis 9, goes to the vertical position 20 and does not prevent the rod 4 from lifting to the extreme upper position, at which the plates 17 are removed from the gap between the pipe 19 and the cone 3, i.e.

the device takes the position shown in figure 1 and can be freely lifted to the surface.

To avoid accidents caused by leaving the device in the cavity

casing, axes 9 and 10 are chosen as a safety link in the device design. When cutting any of these axes, the stem 4 can be raised to its extreme upper position, i.e. device in

whole - extracted from the cavity of the casing.

Claims (1)

Invention Formula Casing extraction device pipes, including a cylindrical body with a conical surface in its lower part, conical dies installed with the possibility of translational movement relative to the conical surface of the body, and a rod connected with the dies, characterized in that, in order to increase the efficiency and reduce labor costs for removing the pipe from soil it provided with a ring with radial grooves mounted above the conical surface of the housing with the possibility of axial movement relative to the latter and connected to the rod with flexible links, and with dies - hinged, with the body and stem connected to each other using an auto-drop, 13 77 nineteen w FIG. 2 "17 1E Fi.Z Aa Fy Bb