RU2105143C1 - Method and device for treating deposit by elastic vibrations - Google Patents

Abstract

FIELD: oil production industry. SUBSTANCE: this can be used for increasing oil recovery from producing beds. Treatment of oil bed is effected through specially equipped well. According to method, weight load is dropped to plunger which is installed in string of pipes. Impact loads from plunger are transmitted through column of liquid located in well below plunger to oil bed and generate elastic vibrations in oil bed which add fluidity to oil found in ground of oil saturated bed and increase its oil recovery. EFFECT: high efficiency. 2 cl, 1 dwg

Description

 The invention relates to the oil industry and can be used for wave action on reservoirs in order to increase oil production and increase oil recovery.

 There is a method of wave action on a reservoir by creating elastic vibrations in an oil-saturated formation due to impacts from a falling load, impacts being produced through production wells, on the bottom of which an anvil is installed.

 The disadvantage of this method is that the impact of the load is carried out in the same limited size wall of the well, which leads to the destruction of the bottom hole zone. Because of this, the impact force is limited, and the destruction of the bottomhole zone affects the contact of the production string with the formation and reduces the effectiveness of the impact on it.

 In addition, since the load falls in a liquid medium, its fall is very slow due to the occurrence of a piston effect.

 The technical problem solved by the invention is to increase the effectiveness of the impact on the oil reservoir by eliminating the destruction of the bottom-hole zone and increasing the power of the pulses of elastic vibrations in the reservoir.

 To solve the problem with a wave impact on the formation, providing for striking with a falling load on the anvil placed in the well, a tubing string is installed in the latter, while a plunger used as an anvil is placed at the bottom of the column, and the wave action on the reservoir carried out through a column of fluid located in the well under the plunger.

 The method can be implemented using a device different from the known device containing anvil placed in the well, a load falling on the anvil and a drive for lifting the load, in that the anvil is made in the form of a plunger installed in a tubing string lowered into the well, which made with a limiter for moving the plunger and a hole for passing gas from under the plunger zone (part of the cavity) of the column into the annulus filled with liquid above this hole.

 The drawing shows a diagram of a device for wave action on the reservoir.

 The device comprises a pipe string 2 installed in the well 1, in the lower part of which a plunger 3 is placed. The restrictor 4 defines the upper boundary of the movement of the plunger 3 under the action of fluid pressure in the well, and an opening 5 is made below the plunger in the pipe string 2 for transferring gas into the annulus. The column 2 is installed in the well so that the plunger 3 is below the liquid level in the well. If necessary, the liquid level is increased by adding it to the annulus.

 A load 6 is placed above the plunger in column 2, connected by a cable 7 to a traction mechanism 8. The drawing shows a mechanism 8, on a traction shaft 9 of which a carrier 10 is fixedly mounted and a shoulder 11 is freely mounted.

 When the shaft 9 rotates at the moment of the maximum lifting of the load 6, the shoulder 11 is ahead of the circular motion of the shaft and the carrier 10, and the load 6 under the influence of gravity falls on the anvil-plunger 3. After that, the carrier 10 catches up with the shoulder 11, which pulls the cable 7 and again lifts the load 6 to maximum height.

 As a drive for lifting loads, a rocking machine or a winch can be used in the same way as in the known device.

 The method can be applied at the stage of additional development of flooded oil deposits. To implement the method, an operational or any idle well that can be equipped according to the above scheme can be selected. The well may be perforated or sealed.

 When the load 6 falls in the well, it hits the plunger 3, and the impact through the column of fluid and the wall of the well is transmitted to the reservoir 12.

 Shocks with a load on the anvil-plunger provide the occurrence of elastic vibrations in the formation, which reach the production wells surrounding the well 1 and through which the formation fluid is taken. The coincidence of the directions of the fluid flow and elastic vibrations contributes to a more complete selection of oil from the reservoir.

 If there are pillars of oil in the reservoir, they are shifted from the place under the action of vibrations and shifted to production wells.

 The force of impact on the plunger is regulated by a change in the mass of the load. So, with a mass of 1 ton falling on a plunger from a height of 2 m, the impact energy will be (W = mgh) 20 kJ.

 The effectiveness of the impact is increased if impacts on the plunger are applied with a frequency that is a multiple of the period of natural oscillations of the liquid column in the well under the plunger.

 The method provides the possibility of a long and effective impact on the reservoir. Oil production is increasing and oil recovery is increasing.

Claims (2)

 1. The method of wave action on the reservoir, including striking with a falling load on the anvil installed in the well, characterized in that a tubing string is installed in the well, the lower part of the cavity of which is separated from the cavity of the string by installing a plunger used as an anvil in it and the wave action on the reservoir is carried out through a column of liquid under the plunger.  2. A device for wave action on the reservoir, containing the anvil installed in the well, the load falling on the anvil and the drive for lifting the load, characterized in that the anvil is made in the form of a plunger installed in the tubing string lowered into the well, the string made with a limiter for moving the plunger and a hole for transferring gas from the subplunger part of the cavity of the column into the annulus filled with liquid above this hole.