RU149448U1 - DEVICE FOR CREATING PERFORATION CHANNELS IN A WELL - Google Patents

Abstract

A device for creating perforation channels in a well, comprising a housing, a wedge with grooves, two hydraulic cylinders placed one after another with connected piston rods, one of which is spring-loaded, and at least two knives with hydraulic monitors placed in the grooves of the support and the wedge with the possibility of radial reciprocating movement, characterized in that between the axial channel and the monitor tubes a valve is installed that opens the fluid supply to the channels only after punching holes in the casing and closes Do not relieve pressure and return the knives to their original position.

Description

The utility model relates to the oil and gas industry, and in particular to the field of secondary opening of the formation by creating perforation channels in the well.

A device for creating perforation channels in a well according to the patent of the Russian Federation for invention No. 2487990 dated 07/20/2013, adopted as a prototype, which contains a tubular housing with hydraulic cylinders located in it with a shank connected to the tubing string and spring-loaded a piston, a wedge with poses, at least two knives with hydraulic monitors installed in the grooves of its support and the wedge with the possibility of radial reciprocating movement. Cavities with working fluid and knives with hydraulic monitoring channels are connected using flexible tubes. This ensures the tightness of the system and the flow of the working fluid into the hydraulic monitor channels without loss.

This device has the following disadvantage.

With a limited amount of working fluid (and this sometimes happens), as well as in the absence of high-capacity pumping equipment (more than 120 atm.), It becomes necessary to stop the leak through the hydraulic channels at the initial stage of punching holes in the pipe.

The technical result, which is achieved by the claimed utility model, is to reduce the flow rate of the working fluid, as well as to reduce the pressure required for punching the working fluid pressure.

To achieve the specified technical result, a valve mechanism is provided in the mechanism of the hole piercing assembly. This will make it possible to use the existing pumping equipment without involving high-power units.

For guaranteed hole punching, the claimed device for creating perforation channels in the well is equipped with a valve that cuts off the fluid supply to the hydraulic monitor channels until the holes in the pipe are punched, thereby saving the flow of working fluid and creating more comfortable working conditions for pumping equipment (allows the use of less powerful) .

The inventive device is illustrated by an example of its implementation with two hydraulic cylinders, two working knives and a valve that controls the flow of fluid and is accompanied by a General view drawing.

The device comprises a housing 1 formed by the walls of hydraulic cylinders 2, 3 and a wedge 4 having grooves 5, in which two diametrically located tool holders 6 are installed, installed in radial grooves 7 of the support 8. Perforating knives 9 with hydraulic monitors 10 are placed on tool holders 6. 11 and 12 of the respective hydraulic cylinders 2 and 3 are interconnected and have a common axial channel 13, which communicates with their piston cavities 14 and 15 by means of transfer channels 16 and with hydraulic monitors 10 by means of tubes 17 and channels 18. The piston rod 12 p spring-loaded downward relative to the hydraulic cylinder 3 by a compression spring 19 and connected to the support 8. To seal the device, all connections of the structure are equipped with seals. Between the main channel 13 and the tubes 17, a valve 21 is installed.

The operation of the device is as follows.

The device on the tubing string is lowered into the well to the perforation interval and the working fluid is supplied under pressure, which, passing through the channels 13 and 16 into the piston cavities 14 and 15, acts on the piston rods 11 and 12, moving them upward, compressing the spring 19 and dragging the pillar 8.

Toolholders 6 with knives 9 move along the grooves 5 of the wedge 4 and the radial grooves 7 of the support 8 until the walls of the casing string are touched 20. The piston rods 11 and 12 are fixed relative to the casing string 20, and the housing 1 "stretching" the tubing string moves downward, pushing the tool holders apart 6 with knives 9, which perforate the walls of the casing 20. After this, the valve 21 opens, the working fluid passing through the pipes 17 and channels 18 comes out through the hydraulic monitors 10. The jets of the working fluid erode the cement stone and adjacent rock, Zuya cavity in the bottomhole formation zone. After perforation, the fluid pressure is relieved, the tubing string “shrinks”, dragging the casing 1 along with the wedge 4 and pulling the knives 9 out of the walls of the casing 20. The support 8 is returned to its original position by means of the spring 19, dragging the tool holders 6 with cutters 9 to their original position . Then the device is lowered to the calculated distance, the pressure of the working fluid is raised again, and the casing is perforated and channels are formed at the same time. The cycle is repeated as many times as necessary without removing the device from the well. The field for the end of the formation of all channels in the well is stopped supplying the working fluid, the pressure is released to atmospheric, the support is returned to its original transport position and the device is removed from the well.

The use of a simple, reliable and easy-to-use device design will reduce processing time, significantly increase the efficiency of the secondary opening of formations and reduce material and financial costs.

Claims (1)

A device for creating perforation channels in a well, including a housing, a wedge with grooves, two hydraulic cylinders placed one after another with connected piston rods, one of which is spring-loaded, and at least two knives with hydraulic monitors placed in the grooves of the support and the wedge with the possibility of radial reciprocating movement, characterized in that between the axial channel and the monitor tubes a valve is installed that opens the fluid supply to the channels only after punching holes in the casing and closes To relieve pressure and return the knives to their original position.

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