SU1767156A1 - Squeeze cementing tool - Google Patents

Description

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(21) 4758352/03 (22) 09.11.89 (46) 10/07/92. Bul №37

(71) Tashkent Polytechnic Institute Abu Rayhan Biruni

(72) V.N.Kulevtsov, Y.N.Kilin, K.I.Aksenov and A.V.Poshenko

(56) USSR Author's Certificate No. 1108192, cl. E 21 B 33 / 132,1982.

Copyright testimony of the USSR № 1033706, cl. E 21 B 33 / 13,1981.

(54) SPRAY BLADE

(57) The invention relates to the drilling of wells. The goal is to improve the quality of plugging and simplify the design. The device contains a cylindrical housing 1 with a piston 3 at the top and a bottom 8 at the bottom. On the outer surface of the housing 1, there is a multithreaded groove with a winding direction opposite to the direction of rotation of the rock demolishing tool and with the formation of flat lateral troweling surfaces. The diameter of the body is equal to the diameter of the rock-destroying tool. The piston 3 is connected to the breakout tool 5. A plugging mixture 9 is placed under the tool above the bottom 8. The tool is lowered into the well to the place of plugging on the drill pipe. After supplying the washing liquid, the mixture 9 is squeezed out of the housing 1 by the action of the piston 3. The tool 5 moves to the lower position. Then turn on the rotation. The mixture 9 is drilled and rubbed with the outer surface of the housing 1 into the borehole walls with simultaneous calibration of the wellbore, 1 sludge.

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The invention relates to the drilling of wells, namely, devices for the elimination of zones of complications, and can be used in the exploration, mining and oil and gas producing industries.

It is known a device that performs dry plugging of wells, which uses a special technological tool in the form of an auger with turns of a spiral, made inverse to the movement of the drilling tool, providing forced supply of the cement mixture to the walls of the well, and paste with rubber elements, rubbing the mixture into the walls of the well and calibrating them in the range of complications. Pre-tamping in a special container

served dry fast-setting mixture.

A disadvantage of this device is the separation of operations for the delivery of the cement mixture and its disassembly with mashing, which increases the unproductive time during the drilling of exploration wells. In addition, the paste of the device does not provide a uniform calibration of the barrel due to the elasticity of the paste material.

Closest to the proposed device for isolating the zones of absorption in the wells according to ed.St. No. 1033706, representing a hollow screw, the screws of which are oriented in opposite directions; in the cavity of the screw, limited in the lower part of the bottom, there is a piston, and between about VI

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and the piston is a cement mixture. The screw surface of the auger serves as a defender and reflector of the cement mix.

The disadvantage of this grouting plug is the inefficiency of grouting the grouting mixture due to the small lateral surface of the spirals of the mixture. Orientation of screw augers in opposite directions is also not conducive to grouting cMfeun; does not exclude the possibility of overflow of the grouting mixture to the upper part above the plugging zone, and also complicates the design of the device.

The aim of the invention is to improve the quality of the tampon and simplify the design.

This goal is achieved by the fact that in a tamping container, which includes a cylindrical body with a screw outer surface with a winding direction opposite to the direction of rotation of the rock demolishing tool, with a piston in the upper part, a bottom in the lower part, a grouting mixture between them and a drilling tool, screw the surface made in the form of a multiple groove with the formation of flat lateral troweling surfaces, the outer diameter of which is equal to the diameter of the rock-destructive tool, and the boring tool nt is associated with the piston.

The proposed device, combining the delivery of the grouting mixture to the plugging zone, its disassembly and grouting into the borehole walls, due to the large area of lateral trowel surfaces and the direction of the screw opposite to the direction of rotation of the drilling tool, small gaps between the lateral trowel surfaces and borehole walls, provides for cementing the mixture into the pores, cracks and cavities of the well under pressure, prevents the cement mixture from flowing over the plugging zone, forms the wellbore in diameter, p vnom diameter cutter tool and calibrates its range complications. A backing slide, due to the developed screw surface area, ensures good alignment of the bottom hole assembly and straightness of the wellbore.

The upper part of the projectile can also be made helical and, in combination with the helical pipes, can cover areas of large-scale plugging. Due to the large area of the side trowels, the cement mixture is well kept on the walls

well, there is no dilution of the cement mix, it is possible to pacing the cement plug during the plugging process.

Thus, the technical efficiency of this cement plug is determined by its distinguishing features: flat side trowel surfaces formed by a helical surface, which is made in the form of a multiple-thread groove; the outer diameter of the side troweling surfaces equal to the diameter of the rock cutting tool; tooling tool

5 associated with the piston.

The drawing shows the cement plug in the working position.

Cement sludge d works as follows. A snare d including a cylindrical case 1 with a screw outer surface in the form of a multiple groove with the formation of flat troweling surfaces having an outer diameter equal to the diameter of the rock-breaking tool, and with the direction of winding opposite to the direction of rotation of the rock-cutting tool, connected to the core pipe 2 in the upper parts are lowered to the place of plugging on

0 drill pipe string. After the flushing fluid is supplied to the core pipe 2, the piston 3 transfers the fluid pressure through the rod 4 to the overrun tool 5. After that, the retainer 6 is cut off, and the piston 3 system - the rod 4 - the overrun tool 5 moves, and the rod 4 moves through the bore fixed washer 7 figured section. The breaking tool 5, moving progressively in the housing 1, creates an overpressure, with the result that the bottom is broken - the diaphragm 8, and the cement mixture 9 begins to be squeezed into the plugging zone.

5 At the moment when the overrun tool 5 occupies the working position, which provides for the breakdown of the extruded cement mix, its further downward movement is limited by the stopper 10,

0 which rests with its base against the fixed washer 7, and the locking pins 11, which rest against the annular protrusion of the housing 12, prevent the reverse movement.

5 holes of the fixed washer 7, respectively; the curved section of the rod, makes it impossible to turn the standing cone relative to the body. With the rotation of the cement snapshot to the right with its simultaneous movement

grouting of the grouting mixture 9 into the borehole walls (absorbing channels, pores, cracks, cavities), which is carried out by the drilling tool 5 together with the outer screw surface of the housing 1, the winding direction of which is opposite to the direction of rotation of the projectile, which prevents the mixture from squeezing (flowing) upwards, and the large area of the screw surface formed by flat side troweling surfaces, the diameter of which is equal to the diameter of the rock cutting tool, allows At the same time, grouting should simultaneously form the barrel and calibrate the well, center the projectile and maintain the straightness of the barrel.

The drawing also illustrates an example of concrete execution. The underlaying projectile comprises a cylindrical body 1 with a screw outer surface, which is made in the form of a multi-way groove at an angle of 45 ° to the axis of the well. The direction of the thread is opposite to the direction of rotation of the projectile. The lateral flat troweling surfaces formed by the helical groove, the diameter of which is equal to the diameter of the rock-breaking tool that goes through the well, has a large trowel area. The cylindrical body 1 is threaded to the core tube 2 in the upper part. If necessary, the core tube 2 can also be screwed. Inside the housing there is a piston 3, connected by a rod 4 of a figured (hexagonal) section with a dismounting tool 5 in the form of a cone. In the initial position, the system piston 3 - rod 4 - drilling tool 5 is located in the upper part of the cement shells, and the rod 4 is fixed by a clamp 6 installed above the fixed washer 7 with a through-hole hexagonal hole for the rod 4. The fixed washer 7 is located in the upper threaded parts of housing 1 and is located above the breakout tool 5. In the lower part, the housing is covered by a bottom — a diaphragm 8. A backfill mixture is placed between the drilling tool 5 and the bottom 8. In the upper part of the stem 4 is fixed the stopper 10 with latches 11. The column pipe 2 in the lower part of the body has an inner annular protrusion 12.

Claims (1)

The claims of an intake plug, comprising a cylindrical body with a screw outer surface with a winding direction opposite to the direction of rotation of the rock-destroying tool, with a piston in the upper part, a bottom in the bottom, a grouting mixture between them, and a drilling tool, characterized in that in order to improve the quality of tamponing and simplify the construction, the screw surface is made in the form of a multiple-threading groove with the formation of flat lateral troweling surfaces having an outer diameter p is equal to the diameter of the rock cutting tool, and the overrun tool is associated with the piston. R Nn Aa