SU1254137A1 - Device for repairing casings - Google Patents

Description

one

12541

The invention relates to repair and insulation works in a well.

The aim of the invention is to improve the efficiency of repair work by ensuring uniform pressing of the plastic pipe over its entire length to the repaired pipe section.

Fig, 1 shows a diagram of the device at the time of its delivery to the place of defect in the casing; Fig. 2 is a section A-A in Fig. 1 (magnify — i the view); on fig.Z - repaired section of the casing, cross section,

The device consists of a spreader 1, a housing made in the form of clamps 2 and 3, a cylindrical longitudinal-shaped plastic pipe 4, centralizers 5 and 6 on the side surface of the claws, breakable connection 7 in the form of a screw clamp or cable with explosive charge and the cable of the rope 8 on which the device is delivered to. the casing 9. The caps 2 and 3 have on the end surface of the groove to accommodate the ends of the dilator 1,

The device is formed as follows.

From a hardened steel sheet (spring steel) 0.5–1.2 mm thick, 3–6 mm long, 0.99–1.10 wide from the inner perimeter of the casing string, the expander 1 is formed in the form of stress fixed tubular helix and fixed at the ends of the ends of krsch) ek 2 and 3.

A pipe 4 is formed and pierced with resin in the form of a cylindrical tubular casing with an outer diameter equal to the inner diameter; the diameter of the casing pipe being repaired. Then the pipe 4 is put on the expander to form corrugations on it, as shown in Fig. 2, and it is fixed with longitudinal and fiberglass transverse strands (not shown) to expand & p 1,

Centralizers 5 and 6 are installed to eliminate the contact of the corrugated

37g

a plaster with a casing wall (well) 7 during transportation: in the well.

In this case, the crankshafts 2 and 3 are connected with a screw clamp or a cable 7 with a charge of explosives. The device assembly is then suspended above the wellhead on the cable 8 and delivered to the installation site in the casing.

The operation of the device is as follows.

By rotating the screw from the engine on the upper retainer 3 or exploding the charge, the clamps 2 and 3 are pulled together with the centralizers 5 and 6 with the expander 1. Due to the elastic forces, the expander 1 turns and presses the nozzle 4 to the stack of the casing 95 as shown in FIG. H. In addition, a portion of the resin is squeezed into the casing defect.

Due to the constant rolling of the unfolded expander 1 into the nozzle 4 and the wall of the casing 9 during the resin hardening process, the density of contact over the contact surface is provided and all irregularities are filled with resin. As a result, a peculiar bilayer shell is formed, and under the action of fluid pressure, the bearing capacity of the thus formed shell substantially increases. In addition, the expander 1 protects the nozzle A from direct contact with tubing and instruments during the production of work in the well, which significantly increases the quality of casing repair.

Pressing the nozzle due to the elastic forces of the expander eliminates the need for continuous action from the wellhead through the tubing to the nozzle. As a result, the tubing is descended and boosted, the tool descends and is reached under the cable and the rest of the tool is lifted. nozzle. All this helps to reduce the cost, speeding up the casing repair operation.

Fi9.1

A a

FIG. 2

Fi. 3

Editor K. Boloshchuk

Compiled by I.Levkoeva Tehred I.Popovich

4695/35

Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5

Production and printing company, Uzhgorod, Projecto st., 4

Proofreader M. Demchik

Claims (2)

I. DEVICE FOR. CASE REPAIR, comprising a casing with a cylindrical longitudinally-corrugated plastic pipe installed in it and placed concentrically relative to the latter with the expanding body, which is related to the fact that, in order to increase the efficiency of repair work by ensuring uniform pressing of the plastic pipe along its entire length to the repaired pipe section, the device body is made in the form of two covers with grooves along the end surface, and the ends of the expander are placed in the indicated grooves of the roof a screw, while the covers are interconnected by a destructible bond, and the expander is made in the form of a stress-fixed tubular spiral. 2. The device according to claim 1, the only fact is that the destructible connection can be made in the form of an explosive element mounted on cables or screw ties between the covers with the possibility of releasing the latter. (L s 1254137 A1 12541