RU186582U1 - DEVICE FOR HYDROPULSE IMPACTS ON THE BOTTOMFLOUR - Google Patents

Abstract

The device relates to the oil industry and can be used to increase oil recovery of producing wells with multiple hydroimpulse effects on the reservoir. The technical result of the claimed device for hydroimpulse effects on the bottomhole formation zone is to increase reliability and the implementation of the autonomous operation of the drive in self-oscillating mode.

The technical result is achieved by connecting the cavity of the tubing string to the rod cavity of the hydraulic cylinder by means of a piston with a spool mechanism, as well as removing from the design a return spring and an additional channel for connecting the tubing string to the piston cavity of the hydraulic cylinder. 3 ill.

Description

The device relates to the oil industry and can be used to increase oil recovery of producing wells with multiple hydroimpulse effects on the reservoir.

A device for hydroimpulse effects on the bottomhole formation zone (patent RU 2320866, ЕВВ 43/26, ЕВВ 28/00, publ. 03/27/2008, Bull. No. 9), containing a tubing string located in the casing pipe with perforation, to which the hydraulic cylinder is attached, the piston of which is connected to the plunger through a rod sealed with an oil seal. An expansion pipe with windows is attached to the lower end of the hydraulic cylinder, which is connected to the upper end of the implosion chamber, and a spring-loaded valve body is attached to its lower end. To supply the working fluid from the tubing to the rod cavity of the hydraulic cylinder is a pipeline.

A disadvantage of the known device for hydro-pulse impact on the bottomhole formation zone is the low reliability and the inability to implement autonomous drive operation in self-oscillating mode.

The technical result of the claimed device for hydroimpulse effects on the bottomhole formation zone is to increase reliability and the implementation of the autonomous operation of the drive in self-oscillating mode.

The technical result is achieved by connecting the cavity of the tubing string to the rod cavity of the hydraulic cylinder by means of a piston with a spool mechanism, as well as removing from the design a return spring and an additional channel connecting the tubing string to the piston cavity of the hydraulic cylinder.

The essence of the claimed technical solution is illustrated by drawings:

FIG. 1 - a device for hydroimpulse effects on the bottomhole formation zone;

FIG. 2 - piston with spool mechanism;

FIG. 3 - channel communication piston cavity with the annulus.

The claimed device for hydroimpulse effects on the bottomhole formation zone contains (Fig. 1) a tubing string 1 located in a casing 2 with perforation 3, to which a hydraulic cylinder 4 is attached, a piston with a spool valve 5 through a rod 6, sealed by an oil seal 7 is connected to the plunger 8 An expansion pipe 9 with windows 10 is fixed to the lower end of the hydraulic cylinder 4, which is connected to the upper end of the implosion chamber 11, and a spring-loaded valve housing 12 with windows 14 is attached to its lower end. pressure ora 15. For supplying the working fluid from the tubing string 1 to the piston with the spool distributor 5, a central channel 16 is used, into which the working fluid flows through the hollow stem 19. The flow of the working fluid is controlled by spools without a stopper 17 and with a stopper 18. For piston communication the cavities of the hydraulic cylinder 4 with the annulus use the channels 20 (Fig. 2) and 23 (Fig. 1). Free movement of the spools prevents the ball 21 (Fig. 2) and the spring 22.

A device for hydroimpulse effects on the bottomhole formation zone works as follows. The device together with the tubing string 1 is lowered into the well so that the windows 14 of the housing 12 are located at the level of perforation 3 of the casing 2.

The plunger 8 is driven by a hydraulic cylinder 4 installed between the tubing string 1 and the expansion pipe 9 with windows 10, the piston with the spool valve 5 of which is connected to the plunger 8, and the pressure necessary for the piston to move with the spool valve 5 upward is supplied through the tubing string 1, on which the device is fixed from the surface of the earth, since the device is lowered into a well 2000-3000 m deep. The volume of the casing 2 of the well is filled with working fluid, with the plunger 8 and the piston with a spool distributor 5 of the hydraulic cylinder 4 is in the lower position, and the spool with the stopper 18 and the spool without the stopper 17 are in the upper position. The over-piston cavity of the hydraulic cylinder 4, which is in communication with the annular space of the tubing string 1, is filled, like the implosion chamber 11, with borehole fluid.

A working fluid is pumped into the tubing string 1 under pressure, which flows to a piston with a spool distributor 5 in its central channel 16, which is in communication with the spool cavity without a stopper 17, thereby filling the under-piston cavity of the hydraulic cylinder 4. As the under-piston cavity of the hydraulic cylinder 4 is filled with the working fluid , a piston with a spool mechanism 5 connected to the plunger 8, moves up to the exit of the plunger 8 into the expansion pipe 9 with windows 10. At the same time, a vacuum is created under the plunger 8.

A liquid column from the annulus of the tubing string 1 through the windows 10 and the implosion chamber 11 falls down at a speed of 120-150 m / s and, having pressed the spring-loaded valve 13, creates a pressure impulse that is transmitted through the windows 14 and the perforation 3 in the casing 2 to the rock formation and reveals cracks, increasing its permeability in the bottomhole zone.

Upon reaching the piston with spool distributor 5 top dead center, the spool without stop 17 moves downward, blocking the communication of the central channel 16 with the piston cavity of the hydraulic cylinder 4, while the spool with stopper 18 moves downward, communicating the piston cavity of the hydraulic cylinder 4 with its piston cavity and the annulus through channel 20. There is a drop in pressure in the sub-piston cavity of hydraulic cylinder 4, due to excessive pressure in the tubing string 1, the piston with spool valve 5 moves down h, after which the cycle repeats.

The claimed device for hydroimpulse effects on the bottom-hole formation zone with its design allows to increase reliability and realize autonomous drive operation in self-oscillating mode, as well as to abandon the return spring and an additional channel connecting the tubing string to the piston cavity of the hydraulic cylinder.

Claims (1)

A device for hydroimpulse effects on the bottomhole formation zone, consisting of a tubing string, an implosion chamber with a plunger connected to a hydraulic cylinder piston, an expansion pipe having windows, a spring-loaded valve installed in the housing having windows, and pressure concentrators, characterized in that the piston is made with a central channel and a spool mechanism, including one spool with a stopper and another spool without a stopper, which allows the central Nala with the subpiston space and the overlapping of the message when the piston upper end position in which the spool with the stopper allows messages subpiston chamber above the piston with its cavity and the annular space, and then possible to move the piston downward and the cycle repeats.

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