RU2267607C2 - Device to repeatedly create differential pressure drawdown in bottomhole formation zone - Google Patents

Abstract

FIELD: oil production, particularly oil and gas well development for hydrocarbon material.

SUBSTANCE: device comprises check valve, piston, receiving windows, depression chamber and valve with spring. The device is made as swabbing means and depression chamber connected one to another by threaded subs. The swabbing means consists of rope fastening unit, cylinder, hollow shaft, piston and valve with spring. Cylindrical valve is installed in lower part of depression chamber. The cylindrical valve is made as a sleeve with beveled lower end surface.

EFFECT: increased efficiency of well development due to impulsive action application to productive bed.

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Description

The invention relates to the field of oil production, and in particular to techniques for the development of oil and gas wells for the extraction of hydrocarbons.

The need to create depression on the bottom-hole zone of the wellbore is due to the technology of their construction and operation, which consists in the following: mechanical destruction of the rock; the creation of pressure below the reservoir in the wellbore, the removal of clogging material and causing the influx of reservoir fluid.

A well-known pump for well development (application RU No. 94020584, class F 04 B 47/00, 53/10, 1996), comprising a cylinder, a plunger connected to tubular rods, a pressure valve and a suction valve in a cage configured to displacements relative to the housing provided with openings and overlapping cage at its upper position.

The disadvantage of the pump is the lack of performance and design complexity.

Known hydraulic rod pumping unit (AS USSR 853161, class F 04 B 47/04, 1981), containing power and working pumps, the last of which is made in the form of a stepped cylinder with a plunger, discharge and suction valves, an energy accumulator and a column tubing (tubing).

The disadvantage of this installation is the low efficiency of the influx of products and the complexity of the design.

The technical problem to be solved is to ensure the effective extraction of the mud and raw materials from the bottomhole zone, followed by the removal of the mud to the surface at minimal cost.

The aim of the invention is to increase the efficiency of well development due to the pulsed impact on the reservoir, repeated exposure and removal to the surface of mud products.

This goal is achieved by the fact that the proposed device for creating multiple depressions on the bottomhole formation zone, comprising a check valve, a plunger, receiving windows, a depression chamber and a valve with a spring, is made in the form of a swab device and a depression chamber connected to each other and to the pump compressor pipes with threaded adapters, a swabbing device consists of a cable mounting unit, a cylinder, a hollow stem, a piston and a valve with a spring, a cylinder is installed in the lower part of the depression chamber cal valve configured as a sleeve with a chamfered angled lower end surface.

A device for creating multiple depressions on the bottom-hole zone of the formation increases the time between failures of the downhole pumping equipment, increases the depth of the depressive effect on the formation, ensuring the removal of the mud from the bottom-hole zone, causing an intense inflow of the borehole product from the formation.

The drawing shows a device for creating multiple depressions on the bottomhole formation zone.

A device for creating multiple depressions on the bottomhole formation zone comprises a depression chamber 1 with threaded adapters 2 and 3, a swab device 4, consisting of a cable fastening unit 5, cylinder 6, hollow rod 7, plunger 8 and check valve 9. At the bottom of cylinder 6 a valve 10 with a spring 11 is installed in the swabbing device 4. In the depression chamber 1, receiving windows 12 are made, overlapped by a valve 13 made in the form of a sleeve with an oblique lower end surface 13. Through the threaded sub 2, the device cabins opposite processed reservoir interval 14 on tubing 15 tubes.

The device operates as follows.

In a liquid-filled well, the device is lowered on tubing 15 and installed so that the windows 12 of the depression chamber 1 are set opposite the interval of the treated formation 14. Then, the well is packaged. Using the winch of the lifting unit, the swabbing device 4 is lowered into the seat of the valve 10 until it stops in the seat of the valve 10. Then the swabbing device 4 is raised to a level above the windows 12 of the depressant chamber 1, allowing the outflow through the tubing string 15 at the wellhead to the gutter and, at the same time, creating a vacuum in the depression chamber 1. After that, due to the difference in reservoir pressure in the interval of the treated formation 14 and the pressure in the tubing string 15, the opening of the cylindrical valve 13 and the borehole fluid and From the under-packer zone rushes into the lower part of the depression chamber 1 and the cylinder of the swabbing device 4, creating an instant depression in the bottomhole zone. Then, after pressure equalization in the under-packer space, the valve 13 drops to the sub 3, blocking the windows 12 and the cycle repeats, the process of cleaning the bottom-hole zone from clogging and plugging agents continues until the desired results are obtained.

The proposed device provides the ability to carry out how many number of operations to create instantaneous depressions on the formation with the removal of mud and bottomhole fluid for a single descent of deep equipment without the use of special equipment. The proposed device also achieves dynamic stimulation of the formation by creating alternating pressure drops, which can significantly increase its filtration characteristics, increase flow rate or injectivity.

Information sources

Application RU No. 94020584, cl. F 04 B 47/00, 53/10, 1996

A.S. USSR 853161, class F 04 B 47/04, 1981 - prototype.

Claims (1)

A device for creating multiple depressions on the bottom-hole formation zone containing a check valve, a plunger, receiving windows, a depression chamber and a spring valve, characterized in that it is made in the form of a swab device and a depression chamber connected to each other and to the tubing string with threaded sub, a swabbing device consists of a cable attachment unit, a cylinder, a hollow stem, a piston and a valve with a spring; a cylindrical valve made in the lower part of the depression chamber in the form of a sleeve with a lower end surface slanted at an angle.