SU1677276A1 - Compound for treatment of oil pool - Google Patents

Abstract

This invention relates to the petroleum industry. The goal is to increase oil-tightness. The composition contains the following components in their ratio, wt.%: Clay mud 0.5-8.0; polyoxyethylene 0.001-0.01; water the rest. With this ratio of components, the composition exhibits properties that combine the insulating properties of the oil displacing agent from the capillaries. The composition is prepared by mechanically mixing the components within it. The use of this composition allows to increase the oil recovery coefficient by 10-12% and reduce the amount of polymer in the composition by 10 times. 2 ill., 2 tab. Yo

Description

The invention relates to the petroleum industry, namely to substances and technologies for treating an oil reservoir. The purpose of the invention is to increase the oil-testing ability.

In the composition for treating an oil reservoir, including clay powder, polymer and water, polyoxyethylene (POE) is used as a polymer in the following ratios of components, wt%:

Clay powder 0,5-8,0

POE0.001-0.01

WaterEverything

With this ratio of ingredients, the composition exhibits properties that combine the insulating properties and the properties of the oil displacing agent from the capillaries.

FIG. 1 shows the injectivity profile of the wells before the injection of the composition; in fig. 2 - the same, after downloading.

For experimental verification of the composition, several mixtures of reagents were prepared, of which 15–18 showed optimal results (see Table 1).

Polyoxyethylene with mol. May 104-106, bentonite clay powder (other clay powders can be used, but clay powder with a high content of montmorillonite can give better results), water with a density of 1.0-1.1 g / cm3 (fresh or waste water after oil preparation), it is better to use fresh water The composition was obtained by mechanical mixing of the components. The resulting compounds were tested on in the ZON MS VJ Yu Ch | ABOUT

bone on the VZH viscometers and on the re-test.

In tab. 1 shows the results of testing compounds with different content of components and known compositions.

From Table 1, it follows that use of more than 0.015 wt.% In the composition of ioxyethylene leads to rapid precipitation of the dispersed phase and separation, which imposes a limitation from a technological point of view, and less than 0.001 wt.% Does not give effect - the composition works as a pure mud. . The content of the clay powder is more than 8 wt.%, Which is immobile in ecoelastic systems that are not filtered into the reservoir, and less than 0.5 wt.% - the composition works as a pure solution of polyoxyethylene. Thus, the composition should contain polyoxyethylene 0.001-0.01 wt.%, Bentonite dry mud 0.5 to 8.0 wt.%, The rest is water.

From tab. 2 it follows that the composition has the property of blocking highly permeable zones. As a result, the sweep coverage increases, which accordingly provides a significant increase in oil recovery by 10-12%. The composition at low concentrations of reagents has a fluidity and is filtered through a porous medium, but with increasing concentration (as a result of filtration of the filtrate in a porous medium), a system with hydrophobic properties is formed in the viscoelastic and resistant to fresh and stratal waters.

An example. The injection well was prepared for the injection of a composition based on polyoxyethylene and bentonite dry mud to enhance oil recovery. Well studies were carried out (injectivity on reservoirs, temperature of the reservoir, water mineralization) and the annulus was separated by a pumping device.

The injection capacity of the well is 960 m / day, the thickness of the reservoir is 10 meters. It is necessary to inject 1000 m of the composition containing 50 kg of polyoxyethylene and 10 tons of bentonite clay powder (at the rate of 100 m of composition per 1 m of formation thickness). At the time of injection actually took the well in the range of 7 m (Fig. 1).

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Separately prepared 1% solution of polyoxyethylene and 1.0% solution of clay powder. Then, the prepared solutions were poured into a container per 2 m3 of dry mud 10 liters of polyoxyethylene solution. From the tank, the composition of the pump unit was pumped into the well and pushed into the reservoir. The injection was carried out continuously and the water was pumped into the reservoir in a volume of 60 m3 and the flooding was immediately resumed. According to research carried out through

30 days after injection (Fig.) It was determined that the injectivity of the well decreased to 600 m / day; 3 m capacity of the reservoir with maximum acceleration began to take 20% of the total against 80%, in operation

additionally connected 3 m previously not working, but the perforated thickness of the reservoir. Waterlogging rate increased. In addition, equals the intake profile. The main

the mass of water for displacement went into the seams that had previously hardly worked.

Tests were carried out on changing filtration and oil recovery through a porous medium using a composition based on polyoxyethylene and bentonite clay powder. The research results are summarized in table. 2

The use of the invention allows: to increase the oil recovery ratio by 1012%; reduce the amount of polymer in the composition by 10 times; the economic effect of the injection of the composition in one well will be at least 50 thousand rubles. compared to the famous.

Claims (1)

Invention Formula A composition for treating a petroleum reservoir, including clay powder, a polymer, and water, characterized in that, in order to increase oil-consuming ability, the composition contains polyoxyethylene as a polymer in the following ratio of components, wt.%: Clay powder 0,5-8,0 Polyoxyethylene0,001-0,01 WaterEverything Table 1 a - 960 mSut 700200 Fyu.1 a- 600. , 0 700 200 FIG. 2 300 $ 00