RU2217581C2 - Way to boost oil output of field - Google Patents

Abstract

FIELD: oil production. SUBSTANCE: invention boosts oil output and production of oil field thanks to utilization of tidal expansions and compressions of earth's crust caused by solar and lunar effects on it. According to invention external periodic physical actions are carried out depending on solar-lunar effects on earth's crust. Physical actions are executed in zone of oil-carrying formation in the course of compression of earth's crust during solar-lunar fall of tide. Combination of solar-lunar effects is taken into consideration. EFFECT: boosted oil output and production both in new and depleted oil formations, possibility of usage of proposed way in gas production. 2 cl

Description

The invention relates to the oil industry and is intended to increase oil recovery and oil production in both saturated and depleted oil reservoirs.

The invention can also be applied in the gas industry.

A device is known for wave formation treatment, which implements a method that includes exposing the formation to elastic vibrations when injecting a working fluid (see RF patent No. 1727431, class E 21 B 43/00, 1996).

The disadvantage of this method is that the fluid injected into the wells under high pressure during the period of expansion of cracks and volumes of the earth's crust easily fills empty spaces, expanding cracks and thereby impedes the process of absorption of oil from the pores of the formations into cracks, which reduces the oil / water ratio and oil recovery.

The effect of periodic lunar-solar tidal deformations on crack formation and on periodic changes in the amplitudes of mechanical vibrations inside the earth's crust, recorded in wells from 300 to 1000 m deep (V. A. Gavrilov. Creating a borehole geoacoustic observation system. Scientific report of the Kamchatka Scientific Center of the Far Eastern Department, is known) RAS, Institute of Volcanology. Petropavlovsk-Kamchatsky, 2001).

It is known that lunar tides exceed solar tides by several times in amplitude, and their periods do not always coincide in time, and the level of amplitudes of geoacoustic emission is more responsive to lunar influences.

The closest in technical essence to the proposed technical solution is a method of increasing oil recovery and oil production, including external periodic physical effects on the oil-containing formation depending on the solar-lunar effects on the earth's crust (see, for example, RF patent No. 2046936, 10.27.1995) .

As an external impact in the known method using vibration from the surface of the earth to the oil reservoir.

The known method does not take into account that during vibration exposure there is an increase in the compression of the earth's crust (compression of cracks), and after vibration exposure there is an expansion of the earth's crust, and the expansion and compression of cracks from vibration are not synchronized with similar stretches and compressions from lunar-solar tides, as a result of which the effect of vibration is either reduced or completely disappears, depending on the degree of misphasing.

The problem solved by the invention is to increase oil production and oil recovery due to the possibility of more efficient use of tidal stretches and compressions of the earth's crust due to solar-lunar effects on it.

The technical result in the proposed solution is achieved by creating a method of increasing oil recovery of the field and oil production, including external periodic physical effects on the oil-containing formation depending on the solar-lunar effects on the earth's crust, in which according to the invention physical effects are carried out in the zone of the oil-containing formation during compression of the earth's crust during solar-lunar ebb and taking into account the totality of amplitudes of solar-lunar influences. In addition, external influences are carried out either by vibration and / or by pumping liquid; as external influences can be any - magnetic, ultrasonic, etc.

In the proposed method, during periods of expansion of cracks as a result of lunar-solar tides and dilatation of the earth's crust after vibration exposure, oil is extracted (sucked) from the pores of the formation into cracks. During this period, do not fill the cracks with the injected fluid.

After the period of expansion of cracks and extraction of oil from the pores ends and the compression of cracks begins as a result of lunar-solar ebbs and vibrations, it is necessary to pump liquid into injection wells to accelerate oil displacement.

The proposed method of increasing oil recovery and oil production can be carried out as follows.

Preliminarily, the effects are produced on the territory of the field, in the part where it is mined.

For this, at least one vibrator is installed on the territory. Its location is chosen in such a way as to cover the entire area of the formation or any part thereof with maximum or uniform vibrations. In this case, the vibrators are installed within the boundaries of the zone of occurrence of the reservoir.

Then a vibration is carried out in the zone of occurrence of the formation during the compression of the earth's crust at lunar-solar tide.

Elastic vibrations penetrate the solid earth and reach the zones of oil occurrence, since it is known that the accumulated signals from the impact are recorded at distances of up to 100 or more kilometers.

Simultaneously with vibration, fluid can be injected into at least one injection well.

Liquid injection can be used as an independent external impact during the compression of the earth's crust during lunar-solar tide.

With the expansion of cracks, mass transfer occurs between the oil in the pores of the reservoir with the injected fluid located in the cracks.

When compressing oil-filled cracks and pumping fluid into injection wells, oil is displaced through cracks and other channels to production wells.

Liquid injection into injection wells enhances oil displacement from fractures and accelerates their delivery to production wells, and the gradual replacement by oil of oil in the pore space prevents residual deformation and subsidence of the earth's crust on the earth's surface, which is important for buildings and structures.

In the proposed method, the effects are made taking into account the total amplitude of the solar-lunar effects.

Vibrational effects in the proposed method do not leave residual deformations in the earth's crust and on the earth's surface, as a result of dilatancy (expansion), additional deformations arising from vibrations are reversible. Under the conditions of the natural stationary stress state of the earth's crust and external influences, for example, vibrations of an elastic nature, the dilatancy duration corresponds to the exposure time (Mirzoyev K.M. et al. Effect of mechanical vibrations on seismicity, DAN SSSR, vol. 313, No. 1, Geophysics, 1990 , p. 78-83).

Therefore, impacts are carried out daily during periods of compression of the earth's crust, either on the surface of the earth or in wells lasting up to 12 hours.

The proposed method is suitable for oil, and also for gas fields of any field structure and reservoir, as well as rock composition.

The method uses powerful, natural tidal phenomena of the earth’s crust that do not require additional financial and resource costs, and the effect of increasing oil production exceeds all known methods of increasing the production of hydrocarbons due to the fact that more powerful natural phenomena than used in this invention are not known today .

Additional advantages of the method are: environmental safety and the ability to limit the costly drilling of new production wells.

Claims (3)

1. A method of increasing oil recovery of a field and oil production, including external periodic physical effects on an oil-containing formation depending on solar-lunar effects on the earth's crust, characterized in that physical effects are carried out in the zone of an oil-containing formation during compression of the earth's crust during solar-lunar tides and taking into account the totality of amplitudes of solar-lunar effects. 2. A method of increasing oil recovery and oil production according to claim 1, characterized in that the external influences are carried out by vibration. 3. A method of increasing oil recovery and oil production according to claim 1, characterized in that the external influences are carried out by pumping liquid.