SU1601343A1 - Device for for colmatage of well walls - Google Patents

Abstract

The invention relates to the oil and gas industry. The goal is to increase the efficiency of the device operation by making it possible to use the rock to be drilled as a clogging agent. A casing 3 is installed on the housing 1 with the central channel 2 with the formation of an annular chamber (K) 4. In the lower part of K 4 there is a jet pump containing a nozzle (C) 5, an offset chamber 6 and a diffuser (D) 7. Inlet C 5 is hydraulically connected It is connected with channel 2, mixing chamber 6 - with K 4, and output D 7 - with the space behind the device. During the drilling process, the washing fluid passes through the zone of discharge of the rock and, lifting up, enters the space above K 4. The rock particles under the force of gravity are lowered into K and then into the mixing chamber 6. The fluid stream from C 5 mixes with the rock particles and through D 7 is transported to the borehole wall, permeable formations are clogged. 1 il.

Description

This invention relates to the oil and gas industry.

The purpose of the invention is to increase the efficiency of the device by providing the use of rock drilled as G015 as a clogging agent.

The drawing is a diagram of the device

The device includes a housing 1 with a central channel 2, a housing 3j mounted concentrically to the housing 1 to form an annular chamber 4 closed at the bottom. In the lower part of the chamber 4 and on the housing 1 a nozzle is installed, made in the form of a jet pump and containing a nozzle 5, chamber 6 mixing and diffuser 7. The nozzle inlet 5 is hydraulically connected to channel 2, mixing chamber 6 is c. the annular chamber 4, and i the exit of the diffuser 7 - with the space behind the device.

The device is placed under the chisel 8, the solid arrows show the direction of movement of the initial washing liquid, and the dotted lines indicate the washing liquid with particles of the rock to be drilled.

The device works as follows.

The initial flushing fluid is supplied from the surface by the drilling pump through the inner cavity of the drill pipe and the overhead sub and exhausts under pressure from the flushing holes of the hammer 8 and through the joint 5, Hitting the bit 8 into the zone, breaking the rock, the thin fluid is enriched with solid products and then moves up the count; the virgin gap between the –swell wall and the cover 3, the velocity of the fluid,

leaving the specified annular gap decreases sharply due to an increase in the flow cross section at this location. From the separated particles of the solid phase (degradation products) contained in the washing liquid, under the action of gravity enter the chamber 4. The intensity of the entry of solid particles into the said chamber 4 is further increased due to the fact that part of the enriched liquid clinches to the bottom of the 1st flow arising from the action of the ejection effect as a result of the jet pump. Solids in the annular chamber 4 enter the displacement chamber 6 and, together with the high-pressure jet, pass through the diffuser 7 to the well wall and clog the permeable formations.

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the invention

A device for kolmatii walls of the well, including a housing with a central channel, a casing installed concentrically to the housing with the formation of the annular chamber, and placed on the body of nozzles, aphid h ay with the fact that, in order to work by allowing the drilled rock to be used as a plugging agent, the nozzles are designed as a jet pump installed in the lower part of the annular chamber, and contain a nozzle, a mixing chamber and a diffuser, and the nozzle inlet is hydraulically connected en with the housing channel mixing chamber - with an annular chamber, and a diffuser output - with the space of the device.

Claims (1)

Claim A device for -colmating walls, wells, including a housing with a central channel, a housing mounted concentrically to the housing with the formation of an annular chamber, and placed on the nozzles housing, characterized in that, in order to increase its efficiency by providing the possibility of using drilled rock as colmatant, nozzles are made in the form of a jet pump installed in the lower part of the annular chamber, and contains a nozzle, a mixing chamber, and a diffuser, the nozzle inlet being hydraulically connected to anal body mixing chamber - with an annular chamber, and a diffuser output - with the space of the device.