SU1452936A1 - Apparatus for isolating troublesome zones in wells - Google Patents

Abstract

The invention relates to the drilling of wells. The goal is to increase the efficiency of insulation works by ensuring reliable piston fixation in the working position. For this, the device comprises a container 1 with an annular groove on the inner surface with grooves of its lower end, radial holes, a piston 5

Description

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The invention relates to mining and can be used in the drilling of wells to isolate zones of absorption and water inflow.

The aim of the invention is to increase the efficiency of insulation works by ensuring reliable piston fixation in the working position.

FIG. 1 shows the device before its descent into the well, a general view; in fig. 2 - the same, in the process of plugging a complicated well interval; in fig. 3 shows a part of the device, a longitudinal section, in FIG. 4 - spring-loaded finger in the horizontal plane pr fixing it in the annular groove of the tubular to the ontainer; in fig. 5 - lower part of the device in the working position; in fig. 6 - the same longitudinal section.

A device for isolating zones of complications in wells, lowered on pipes, contains a tubular container 1 with a bit 2, a reflector in the form of two blades 3 inclined to the device axis with a spring 4 connected to the bit and a reflector of a piston 5 with an axial channel 6 and radial

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versts with radial guide grooves 7. In the radial holes of the piston 5, fingers 8 are placed with a spring 9 that overlap channel 6. Cylindrical protrusions 10 of fingers 8 are mounted in radial grooves 7. In channel 6, a hollow rod 11 is mounted with a protruding cylindrical a head 12 in the upper part with vertical holes 13 for the passage of fluid. In the lower part, the rod 11 has two steps 14 and 15. In the lower part of the container 1 there is an annular groove 16 on the inner surface with grooves 17 at its lower end. The tabs 14 and 15 sequentially interact with the fingers 8 when they are fixed respectively in the annular groove 16 and the slots 17. The protruding locking parts of the fingers 8 have in cross-section the shape of segments with lower horizontal planes. At the end of the stroke of the piston 5, the horizontal planes of the fingers 8 interact with the lower end of the annular groove 16, and the cylindrical head 12 covers the radial holes 18 made in the container 1, below the sheared bottom plate 19,

Above-ground material 20 is located above. Through adapter 21, a container is connected to a string of 22 drill pipes.

The device works as follows.

Before lowering into the well, the container 1 is filled with a quick-set grouting mix (BSS) 20 in an amount necessary for plugging in the zone of geological complication. A piston 5 with a reflector fixed on it and a chisel 2 is installed in the upper part of the container above the BSS packages. The container 1 is connected to the drill string string 22 with the aid of the adapter 21, and the device is lowered into the zone to be plugged. After that, in the device, water is supplied through a string of drill pipes 22, which through the holes 13 of the cylindrical head 12 acts on the piston 5, moving it to the bottom of the container and squeezing out the BSS from it. The axial channel 6 at the same time blocked by fingers 8 (Fig. 3). Upon further movement of the piston, the body 8, under the action of the spring 9, enters the annular groove 16. At the same time, their cylindrical projections 10 slide into the guide groove 7, keeping the fingers in a predetermined position, and their position in the annular groove 16 is fixed by the first step 14 of the lower parts of the rod 11 (Fig. 4).

The pressure on the piston decreases as the axial shank 6 partially opens, and water and the cavity of the stem 11 are throttled into the well. With further forward movement of the piston 5, the fingers 8 slide along the annular groove 16 and abut their flat part against its lower edge. The water pressure on the piston 5 at this moment is completely relieved through the radial holes 18. The vanes 3 of the reflector are extended under the action of the spring 4 and are set in the working position. By rotating the device around the axis, the fingers 8 are fixed in the slots 17 (Fig. 5). In this case, the rod 11 is lowered and the second step 15 prevents the fingers from squeezing in the radial direction. The head 12 of the rod is combined with the radial holes 18, which leads to an increase in pressure

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above the piston 5 and makes it possible to control the installation of the device in the working position according to the manometer of the mud pump (Fig. 6).

The device is driven by the drilling machine and moves down the well. Chisel 2 is used to de-pressurize the envelopes of packages with a tamping material and mix dry BSS with water. The reflector, which forms in the visco-plastic mass, overwrites the pores and cracks of the plugging interval, where its rapid solidification occurs (Fig. 2). Upon completion of the elaboration of the complicated interval, the tamper unit is removed from the well, after which the process of its deepening is resumed.

Claims (1)

Invention Formula A device for isolating zones of complications in wells, lowered on pipes, including an adapter, a tubular container with a bit, a reflector and a piston connected to them with an axial channel and radial holes with radial guide grooves in which cylindrical projections of spring-loaded fingers with protruding fixing parts installed in the radial holes and overlapping the axial channel of the piston, in the lower part of the tubular container on the inner surface there is an annular groove with grooves at its bottom its end, the tubular container is covered at the bottom with a slit bottom over which the grouting material is placed, characterized in that, in order to increase the efficiency of the insulation work by ensuring reliable fixation of the piston in the working position, it is provided with a hollow rod in the upper part with a prominent cylindrical head vertical holes for the passage of fluid and with two benches in the lower part, installed in the axial channel of the piston with the possibility of movement and reciprocation. modulating its ledges in series with spring-loaded fingers while fixing the latter, respectively, in an annular groove and grooves of a tubular container, five 0 50 55 ten go goto / 5 FIG. V V Fi &. Figm 18 D) 18 17-8 FIG. five Fie.6