SU973805A1 - Method of acting upon formation - Google Patents

Description

(METHOD OF EXPOSURE TO THE FORMATION

one

The invention relates to the oil and gas industry.

A known method of increasing the non-gas recovery of the exploited reservoirs, carried out by the action of electro-hydraulic shock waves. The disadvantages of this method are the small radius of the impact of the shock waves and the complexity of its implementation.

The closest way to influence the reservoir, including the creation of a shock wave in the bottomhole zone 2.

The disadvantage of this method is the low power of the generated shock wave.

The purpose of the invention is to increase the effectiveness of the effect on the formation by increasing the power of shock pulses.

The goal is achieved by the fact that a shock wave is created by lifting a column of well fluid.

FROM the sub-packer zone to the supra-packer jet pump, which is hydraulically connected with the subsequent communication of the over-pack cavity with the bottom hole by relieving pressure from the packer.

The drawing shows a device implementing the method.

The proposed method is carried out as follows.

Down on the pump and compressor

10 pipes 1 jet device 2 with a hydraulic packer 3, the internal cavity of which is hydraulically connected to the high pressure chamber of the jet pump i. When the jet pump is turned on, simultaneous packing of the well occurs. When pumping liquid from the subpacker zone, a void is formed in the annular space. With

Claims (2)

20 relieving the pressure inside the tubing unpacking of the well and free fall of the raised liquid column about the bottom is performed. When a fluid influx hits, there is a sharp jump in pressure in the lower part of the well, with pressure waves propagating in the direction of both the well and the formation. This oscillatory process after some time is repeated and is described by the equation X - (, V-./lt)e 5iMUJ-fc - amplitude of the k6 slice of the prize zone; VP is the impact velocity of the falling liquid column on the bottom; Vo-T / Zg-H is the acceleration of the free fall equal to 981 — the height of the fall of the liquid column or the distance between the packer and the tailing pipe of the compression tubes; oscillation frequency; - g with „E - modulus of elasticity of the rock of the productive formation; C, Cjj is the speed of sound propagation, respectively, in the bone and in the rock; L is the length of the falling liquid column or compressor pipes from the wellhead to the installation site of the packer; f is the specific gravity of the well fluid; n is the coefficient characterizing the temp of attenuation of the number of the bath; .., F is the cross-sectional area of the well; d- - coefficient characterizing the viscous friction between the pipe string and the well liquid; t is the fluctuation of the reservoir. The dynamic fluctuation in the developed field according to the invention is carried out in accordance with the geotechnical indications of the data of the exploited formations. The economic effectiveness of the implementation of the proposed invention lies in the simplicity of its implementation and the high dynamics of the effect on the formation. Claims of formation method, including the creation of a shock wave in the bottomhole zone, characterized in that, in order to increase the effectiveness of the effect on the reservoir by increasing the power of shock pulses, the shock wave is created by raising the column of well fluid from under the packer zone to the suprapacker jet pump hydraulically connected with the packer, followed by communication of the non-packer cavity with the borehole bottom by relieving the pressure from the packer. Sources of information taken into account during the examination 1. USSR author's certificate No. 636378, cl. Е 21 В it3 / 26, 1978. 2. USSR author's certificate №, cl. E 21 B 43/26, 1959 (prototype).