SU1108192A1 - Apparatus for isolating complicated zones - Google Patents

Abstract

A DEVICE FOR ISOLATION COMPLICATED ZONES, including a chisel, an adapter and a reflector placed above the chisel and made in the form of a screw with coils opposite to the direction of rotation of the chisel, the container, characterized in that, in order to improve the quality of oil well operations in horizontal wells, it is equipped an elastic coil having the ability to unclamp to the diameter of the well, and the turns of the screw in the vertex are made with grooves, with an additional elastic coil located in the grooves of the turns of the screw.

Description

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The invention relates to the mining industry, and more specifically to the oil and gas industry, and can be used to eliminate geological complications in the drilling of exploration wells.

A device for isolating complication zones is known, which includes a chisel, a container, a reflector and a spring 1.

The disadvantage of this device is that as soon as the bit hits the solid base, the helix will expand to the diameter of the well and the forward delivery of the entire device will stop as its wedging will occur in the well. It can move forward again if there is no support ahead, but then the spring will regain its original shape, i.e. decreases in diameter, and thus a quality plug-in cannot be made, especially in horizontal wells.

Closest to the present invention is a device for isolating zones of complications, including a bit, an adapter and a reflector placed above the bit and made in the form of a screw with turns opposite to the direction of rotation of the bit, container 2.

A disadvantage of the known device is that the pins placed in the tubular container have an outer diameter 10-15 mm smaller than the diameter of the well and therefore cannot carefully transfer the dry cement slurry with water. A thin, dry layer of the mixture always remains at the borehole walls, preventing the penetration of the liquid mixture into the cracks and pores of the rocks. Therefore, the quality of grouting works is extremely low. This is especially observed in horizontal wells, where a dry cement slurry is always deposited on the bottom wall, preventing the quality of the cement grouting works.

The purpose of the invention is to improve the quality of grouting operations in horizontal wells.

The goal is achieved by the fact that a device for isolating complication zones, including a chisel, an adapter and a reflector placed above the chisel and made in the form of a screw with coils opposite to the direction of rotation of the chisel, is provided with an elastic helix that can be opened to the diameter of the well, and the turns of the screw at the apex are grooved, and an additional elastic helix is located in the slots of the turns of the screw.

FIG. 1 shows the device in front of the zone of complications, a longitudinal section; in fig. 2 - device at the moment of tamponing the interval of complications, longitudinal section.

A device for isolating complication zones in wells comprises a container 1, a piston 2 with pins 3, a spring 4, apertures 5, a reflector 6 made in the form of a screw with turns of the left direction,

chisel 7 and sleeve 8 with grooves 9 and shear bottom 10. In the grooves made on the ridge of the reflector 6, placed elastic coil 11, having an outer diameter corresponding to the diameter of the well.

The device works as follows.

Before lowering the device into the well, the piston 2 with the screw reflector 6 mounted on it and the bits 7 are placed in container 1. At the same time, the elastic coil 11 is sunk in the slots of the reflector 6, squeezing to the inner diameter of the container 1. To the bottom of the container is attached the sleeve 8 grooves 9. In the container on the hub side, bags with a quick-setting mixture 12 are placed and locked with a shear head 10.

The device is lowered into the well by means of a string of drill pipes (not shown) connected to the device at the top of the container.

In the zone of complications in the drill string

0 pipes are supplied with water, under the pressure of which the sprit 2 squeezes out packets from the container 1 with a quick setting mixture 12. After squeezing out the bags with the mixture, a screw reflector 6 comes out of the container I, while the elastic coil 11

5 is expanded to the diameter corresponding to the diameter of the well. The pins-clips 3 under the action of the spring 4 are fixed in the grooves 9 and open the holes 5 for supplying water to the packets of the quick-setting mixture. si The roller cone bit 7 breaks and when moving with water a liquid quick-setting mixture is prepared. Due to the elastic helix 11, the screw reflector 6 mixes the entire mixture, leaving no dry powder on the walls of the well. The liquid mixture with elastic coil 11 is crushed into the cracks and pores of the rocks, eliminating the absorption of the washing liquid and the collapses of the borehole walls.

Application of the proposed device

0 allows qualitatively cementing the zones of complications of exploration wells by mixing all the dry cement mixture in the well.

Claims (1)

DEVICE FOR ISOLATING COMPLICATION AREAS, including a bit, adapter and reflector placed above the bit and made in the form of a screw with turns opposite to the direction of rotation of the bit, a container, characterized in that, in order to improve the quality of grouting in horizontal wells, it is equipped with an elastic spiral having the ability to expand to the diameter of the well, and the turns of the screw at the apex are made with grooves, and an additional elastic spiral is located in the grooves of the turns of the screw. ) 23455 // 7/2 8 3 10 ³ Fig. 1