SU1078034A1 - Water-hydrocarbon emulsion for recovering residual oil - Google Patents

Description

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The invention relates to the oil industry, in particular to the field of the development of reagents for increasing the amount of oil extracted from the depths in the early and late stages of field development.

The compositions of microemulsions and emulsions are known, which are used to enhance oil recovery when the oil is refined after water is flooded in oil-bearing formations. The main components of these compositions are liquid hydrocarbons, water, surfactants, electrolytes {Nac6 /, -sometergents (butyl or isoprpyl alcohol). Microemulsions (emulsions / may be in the aqueous phase (direct oil-in-water type or in the hydrocarbon phase (reverse water-in-oil type)) Low boilers (hexane, octane, kerosene, gasoline / oil fractions, or low viscosity oils. Cl I The disadvantages of the known microemulsion formulations are the complexity of the composition and the limited use, since they are ineffective in formations with highly mineralized waters.

The closest in technical essence to the present invention is a 1-hydrocarbon emulsion for the recovery of residual oil, including water, a liquid hydrocarbon, a water- and oil-soluble surfactant 2.

A disadvantage of the known devices is the inapplicability in reservoirs with a salinity of more than 5%.

The aim of the invention is to improve the oil-driving properties of the composition under conditions of high salinity of formation waters and to reduce the cost of the emulsion.

This goal is achieved by the fact that a hydrocarbon emulsion for extracting residual oil, including water, liquid hydrocarbon, water-and-oil-soluble surfactants, contains oxyethyl alkylphenol of type OP-10 as a water-soluble surfactant, and as an oil-soluble PAVoxyethylated alkylphenol, OP-4 will be detected .%:

Ethoxylated

alkylphenol type OP-4 3.9-5.5

Ethoxylated

alkylphenol type OP-10 0.1-0.2

Liquid hydrocarbon 40-41

Water Rest

Water and oil-soluble surfactants in the proposed emulsion were selected with

taking into account their chemical structure (the ratio of hydrophilic and hydrofibrm parts of the molecule). Oxyethylated alkylphenols were used as water-soluble surfactants, 5 an example of nonylphenol type OP-10 with a degree of oxyethylation of 10-12 mol of ethylene oxide per 1 mole of alkylphenol (AF, and as an oil-soluble surfactant - oxyethylated no. 10 naphaphenol of OP-4 type, OP-4, an OP-4 type, OP-4) 2-5-5 mol of ethylene oxide per 1 mol of AF. Moreover, nonylphenol was obtained by measuring the alkylation of phenol with trimers of propylene using, for example, cation exchanger as catalyst,

Within the chosen limits of the degree of hydroxyethylpyrnan surfactants, they were stable for several months.

Q emulsion of the reverse type water in oil, its effective application in conditions of high salinity of formation waters. With a greater or lesser degree of non-phenyl oxyethylation of phenol, a direct-type oil-in-water emulsion is obtained, which is stratified into separate phases, which excludes the possibility of obtaining a positive oil displacement effect. As the hydrocarbon phase used

kerrsin, and the aqueous phase - fresh and mineralized formation waters. As the defoaming agent, the polymethylsiloxane PMS-2bOA silicone fluid was chosen. Amount of defoaming

 the fluid is selected, based on its minimum consumption and effective foaming reduction during the preparation of the emulsion. .

Example. To obtain an emulsion of composition 1, two solutions were prepared. One of them is kerosene again, and the other is water. Water-soluble, water-soluble hydroxyethylated galactic nonylphenol type OP-10 concentration

5 0.1 g / 100 ml solution. In kerosene, a solution of oil-soluble / south nonylphenol of type OP-4 was prepared with a concentration of 7 g / 100 ml of solution, and the antifoam was dissolved in the amount of

0 0.005 g / 100 ml emulsion. Then these two solutions were mixed in a mixer for 5 minutes. The phase volume ratio was 1: 1.

To verify the properties of a water-hydrocarbon emulsion: within the specified ratios, three formulations were prepared, which bishees were tested for oil-displacement efficiency under conditions of different mineralization of formation water and water for the preparation of emulsions.

The test results are shown in the table. skoi mesizvestny Plastova RSmashkin Torpedo Plastova Plastova Pres on Plastova Plastova Presna

Claims (1)

A HYDROCARBON-HYDROCARBON EMULSION FOR REMOVING RESIDUAL OIL, including water, Liquid hydrocarbon, water- and oil-soluble surfactant, characterized in that, in order to improve the oil-displacing properties of the composition in conditions of high salinity of formation waters and cheapening the emulsion, it contains a water-soluble alkali-type surfactant -Y, and as an oil-soluble surfactant, ethoxylated alkyl phenol of type OP "-4 in the following ratio of components, wt.%: Oxyethylated alkyl phenol type OP-4 Oxyethylated alkyl phenol type OP-10 Liquid hydrocarbon Water 3.9-5.5 0.1-0.2 40-41 Rest SU., „1078034>