RU2490422C1 - Plant for impulse action on productive formation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: plant involves a tubing string with a cylinder attached to it, a piston with end-to-end inner channel placed in the cylinder and a pressure valve installed at the lower end. In the cylinder walls there are radial windows than can be open at the upper point of the piston stroke. At the cylinder bottom there is a transmitter with possibility of reciprocative movement; it is connected to a waveguide mechanically. Radial windows are located at a smaller distance from the lower butt of the cylinder than the piston length.

EFFECT: improvement of overall performance due to loss reduction during impulse transmission to a productive formation with simultaneous pumping off.

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Description

The invention relates to the field of intensification of oil production by seismic effects in fields operated by a downhole method.

A device for shock wave action on a hydrocarbon containing formation according to the patent of the Russian Federation No. 2067154, IPC E21B 28/00, publ. 09/27/1996 (1 option), including a working body fixed in the casing and a hammer, connected to the drive by a flexible inextensible connection. A matching unit is installed on the working body, equipped with centralizers, on which a direction made in the form of a hollow cylinder is rigidly fixed, in the inner cavity of which is located with the possibility of longitudinal movement of the strikers, and through holes are made in the lower part of the direction.

The disadvantages of this device is that it has energy losses due to the use of long mechanical waveguides, while due to the fixation of the working body in the casing, the oil well has to be decommissioned.

Closest to the proposed technical solution in terms of the technical essence and the totality of existing features is the installation for impulse action on the reservoir (RF patent No. 2140533, IPC E21B 43/25, E21B 28/00, publ. 10/27/1999), including a pumping column installed in the well -compressor pipes with a cylinder, a plunger placed in the cylinder with a non-return valve and a rocking machine connected by a rod string to the plunger so that at the upper point of the plunger stroke a message is made between the cylinder cavity and the cavity of the tubing string . The installation is equipped with a plug mounted coaxially with the possibility of reciprocating motion on the cylinder or in its cavity and in direct contact with the fluid in the well.

The disadvantages of this installation is that due to direct contact of the plug with the fluid in the well, it has large energy losses when transmitting pressure pulses through the gas-containing fluid from the installation to the perforation zone of the oil reservoir, while the installation due to the communication of the cylinder cavity with the cavity of the tubing string pipes does not have the ability to pump liquid, therefore, the oil well has to be decommissioned.

The technical task is to increase the efficiency of the installation by reducing losses during the transmission of an impulse to a productive formation while simultaneously pumping fluid.

The stated technical problem is solved in that in the installation for pulsed action on the reservoir, including a tubing string with a cylinder attached to it and a plunger located in the cylinder with a through internal channel and a discharge valve installed at the lower end, while the cylinder walls are made radial windows with the possibility of opening at the upper point of the plunger stroke, according to the technical solution, a radiator is installed at the bottom of the cylinder with the possibility of reciprocating Ia and connected to a mechanical waveguide and radial holes formed at a distance from the lower end of the cylinder is less than the length of the plunger.

The installation is supplied with a radiator mounted with the possibility of reciprocating motion and connected to a mechanical waveguide, in combination with the proposed arrangement of the radial windows, it generates an impulse by using the energy of the liquid column filling the well and transferring it directly to the reservoir while pumping the liquid to the surface , which allows not to decommission the well, but to create an impulse in the immediate vicinity of the formation and transmit it to the the ductive formation by a mechanical waveguide significantly reduces energy loss than when transmitting through a column of liquid containing a large amount of gas, as in the prototype. The reciprocating movement of the emitter provides an efficient transmission of the generated pulse through a mechanical waveguide into the reservoir.

The essence of the technical solution is illustrated by an example of a specific design and a drawing, which shows the installation for pulsed impact on the reservoir.

The proposed installation for pulsed impact on the reservoir includes a tubing string 2 located in the well 1 and a cylinder 3 connected to it, in the walls of which are made radial windows 4 with the possibility of opening at the top of the stroke of the plunger 5. At the bottom of the cylinder 3 there is an emitter 6 s the possibility of reciprocating motion, connected to a mechanical waveguide 7, the lower end of which is immersed in the reservoir 8. Inside the cylinder 3 there is a plunger 5 with a through inner channel 9, provided nny mounted on the lower end of the discharge valve 10. The plunger 5 is connected to the rods 11 with a surface drive a reciprocating-type (e.g., a rocking machine).

The proposed installation for pulsed impact on the reservoir works as follows. The installation is placed in a liquid-filled well 1, the plunger 5 is connected by rods 11 with a rocking machine. In the initial state, the plunger 5 is in its lowest position, blocking itself, the radial windows 4, the discharge valve 10 is closed.

When the plunger 5 moves upward, the liquid from the above-plunger space is displaced into the flow line and, due to the resulting vacuum, a decrease in pressure occurs in the subplunger chamber. When the lower end of the plunger 5 reaches the radial windows 4, they open at reduced pressure in the subplunger chamber compared to the annular pressure. The fluid from the annulus rushes into the zone of reduced pressure (sub-plunger space), i.e. there is a water hammer, creating a pressure impulse, which acts on the emitter 6, making a reciprocating motion, and the resulting force through the mechanical waveguide 7 is transmitted to the reservoir.

After the plunger 5 reaches its extreme upper position, its downward movement begins. When the plunger 5 moves downward, the discharge valve 10 opens and the liquid from the subplunger chamber is forced into the supraplunger space through the through internal channel 9.

Next, the cycle repeats.

Claims (1)

Installation for pulse impact on the reservoir, including a tubing string with a cylinder attached to it and a plunger located in the cylinder with a through internal channel and a discharge valve mounted at the lower end, with radial windows made in the cylinder walls with the possibility of opening at the upper point the plunger stroke, characterized in that it is equipped with a radiator mounted at the bottom of the cylinder with the possibility of reciprocating motion and connected to a mechanical waveguide, and the radial windows are made at a distance from the lower end of the cylinder less than the length of the plunger.

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