The method of development of oil fields

 

(57) Abstract:

The invention relates to the field of oil and can be used to displace oil from the reservoir. The technical result is to increase the coverage of the reservoir water flooding and the intensification of oil production from low-permeability oil-saturated zones with the use of foam systems. In the way of development of oil fields, including the displacement of oil from reservoirs using alternate download foaming solution - aqueous solution of surfactants surfactants and gas, the gas is injected into the volume, allowing to convert the layer of foam solution foam in the rim with the conventional ratio of 4 to 5, then in the resulting foam rim inject an aqueous solution of the surfactant in the amount of that allows you to convert it to a more mobile in the reservoir gas-liquid slug with a nominal ratio of 1.1 to 1.2, then in the resulting gas-liquid slug is pumped gas to convert it again into a frothy b when the gas is pumped until the slowdown pressure injection, and an aqueous surfactant solution is to reduce the pressure of injection. Injection of an aqueous surfactant solution and gas alternate to an economical werepositive in the development of oil fields with the flooding of the reservoir.

There is a method of developing oil fields, providing for the displacement of oil from reservoirs by pumping in gas and water [1].

The disadvantage of this method is that its implementation requires a large amount of gas. In addition, the front of the advancing gas behind the displacement front.

Known methods of development of oil fields by displacing the oil from the reservoir water fringes [2, 3].

The disadvantage of known methods is their low efficiency in heterogeneous reservoirs due to the fact that the gas-liquid slug penetrates mainly in the high-permeability layers and does not promote involvement in the development of low-permeability oil-saturated zones (intervals of the reservoir).

Closest to the claimed technical solution is the way of the development of oil deposits, providing for the displacement of oil from reservoirs using alternate download foaming solution - aqueous solution of surface-active substances (surfactants) and gas [4].

Prohazova system creates a more uniform screen over the entire area of contact of the displacing agent with the reservoir fluid, but the coverage of the reservoir water flooding will oabout huge energy costs.

The technical task of the invention is to increase the coverage of the reservoir water flooding and the intensification of oil production from low-permeability oil-saturated zones with the use of foam systems.

To solve the problem in the way of development of oil fields, including the displacement of oil from reservoirs using alternate download foaming solution - aqueous solution of surfactants surfactants and gas, the gas is injected into the volume, allowing to convert the layer of foam solution foam in the rim with the conventional ratio of 4-5, then in the resulting foam rim inject an aqueous solution of the surfactant in the amount of that allows you to convert it to a more mobile in the reservoir gas-liquid slug with a nominal ratio of 1.1 to 1.2, then in the resulting gas-liquid slug is pumped gas to convert it again into a frothy b when the gas is pumped until the slowdown pressure injection, and an aqueous surfactant solution is to reduce the pressure of injection.

Injection foaming aqueous surfactant solution and gas alternate to economically develop oil fields.

Foam system is created in the reservoir metachat aqueous solution of ionic or nonionic surfactant, for example sulfonic acid, neonols, etc. is 0.5 - 0.8 wt.% with polyacrylamide (PAA) 0,01-0,015 wt.%, and as gaseous agent is air, nitrogen, natural gas. Download lead with mutual penetration of one phase (rims) in another. The concentration of the reagents identified by results of research.

The implementation of the method begin with, via the injection well into the reservoir pumped prepared by any of the known technologies, the surfactant solution with PAA. The amount of solution depends on the reservoir properties of the reservoir and a specified amount of fringe.

After THEN, the reservoir pump gas that penetrates into the pores and spanaway to fill them with the solution due to the dispersion of the gas phase and encapsulating the liquid resistant film.

Example calculate the volume of the foam rim.

For example, on the recommendation of the geological survey mining company in the reservoir, you must create a foam rim volume of 500 m3.

The amount of foaming of the solution is determined on the basis of the ratio of foam

Kp=(Vse+VCR)/VCR,

where (Vse+VCR)=Vp- volume panagotopulos;

VCR- the volume of foam solution;

Vse- the volume of a gas is the gas b with multiplicity - 5, then VCR=500 m3/5=100 m3.

Then the volume of gas, which is a part parogazovoi rims, in-situ equal:

Vse=Vp-VCR=500-100=400 m3

The volume of gas at normal conditions (on the surface) is determined from the formula of clayperon-periodic:

Vse=VthPaboutTp/PpTabout,

where Vththe volume of gas at normal conditions, m3(400 m3);

Pabout- atmospheric pressure, ATM (1 ATM);

Tabouttemperature at the intake of the compressor, (253 K);

Pp- pressure in the reservoir, MPa (200 ATM);

Tpthe temperature in the reservoir, (333 K).

Vth=VsePpTo/PaboutTp=400200253/1333=60000 m3

Thus, from the surface into the reservoir must be uploaded 60000 m3gas to get parogazovoi the rim of 500 m3with multiplicity - 5.

Created a foam structure occupies a volume several times larger (KP, where Kp=1+Vse/VCR) than the rim of the solution. Is the coverage layer in the radial direction with the displacement in the direction of wells of the fluid located at the front of the foam rim.

For injection is prepared THEN the quantity corresponding to the volume of the previous injection. The second fringe pump, controlling the pressure at the wellhead. Upon reaching the fringe of the borders of the foam rim the pressure increases, as it will increase the hydraulic resistance of the pumping fluid in the pore space filled with foam. In the process of moving the solution through the foam last more watered with, its multiplicity is reduced and it turns into a bubble, the liquid (gas-liquid b) bubble size less than the size of the pore of the channel. The transformation of the foam in the bubble liquid as the water is almost at constant pressure until, until the solution reaches the outer boundary of the foam rim, the pressure at the wellhead will be significantly reduced, which is a signal to stop the injection TIME.

Thus, after the injection of the solution, gas injection and re-injection of the solution around UB>se/VCR.

In injection well again pump the gas, which is relatively easily penetrate into the formation and spanaway bubble liquid, thereby advancing front cover reservoir flooding farther to producing wells.

As the foaming fluid pressure is increased and when the gas output at the external border of the bubble fluid, the rate of increase of the discharge pressure will be significantly reduced. Possible stabilization of pressure or even drop that will signal the termination of gas injection.

After re-injection of gas in the reservoir of the newly formed foam with multiplicity Kp=1+Vse/VCRfront which moved in the radial direction in accordance with a total volume pumped rims.

Cyclical injection foaming solution and gas alternate to economically develop oil fields. Repeated cyclic loading, followed by a conditional increase of the ratio of injection gas and the reduction ratio for injection foaming solution, reducing energy costs for the promotion of the foam rim at a considerable distance from the injection wells to increase Oh what="ptx2">Sources of information

1. M. L. Surguchev. Secondary and tertiary methods of enhanced oil recovery. - M.: Nedra, 1985, S. 194-195.

2. RF patent №2125154, MKI7E 21 IN 43/22, 1997.

3. USSR author's certificate No. 1543896, E 21 In 43/20, 1996.

4. RF patent №2186953, E 21 In 43/16, 2002.

1. The method of development of oil fields, including the displacement of oil from reservoirs using alternate download foaming solution - aqueous solution of surface-active substances (surfactants) and gas, characterized in that the gas is injected into the volume, allowing to convert the layer of foam solution foam in the rim with the conventional ratio of 4 to 5, then in the resulting foam rim inject an aqueous solution of the surfactant in the amount of that allows you to convert it to a more mobile in the reservoir gas-liquid slug with a nominal ratio of 1.1 to 1.2, then in the resulting gas-liquid slug is pumped gas to convert it again into a frothy b when the gas is pumped until the slowdown pressure injection, and an aqueous surfactant solution is to reduce the pressure of injection.

2. The method according to p. 1, characterized in that the injection of an aqueous surfactant solution and gas alternate to economic the

 

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