The oil extraction method

 

(57) Abstract:

The invention relates to the oil industry and can be used to enhance oil recovery when the flooding. The technical result is to increase oil production in the development of oil fields with simultaneous decrease in water content of produced fluids by increasing the coverage of the reservoir pressure and displace residual oil. In the oil extraction method, including injection into the formation via the injection well an aqueous solution of the chemical - ethoxylated carboxylic acids COC General formula CnH2n+1COO(C2H4O)mH, where n = 15-20, m = 2-ll with a molecular mass of 344-810, or a mixture thereof, pushing him into the formation water and oil extraction through production wells, in addition the injection of an aqueous solution of the chemical is injected organic solvent at a ratio of COC or a mixture of the organic solvent is 1:99 to 99:1, and after injection conduct technology exposure specified aqueous solution. As organic solvents can be used cellosolve or waste production cellosolve, straight-run gasoline or any hydrocarbon restoreit to the oil industry and can be used to enhance oil recovery when the flooding.

Known methods flooding of oil reservoirs, which include injection of a solution of polymer and surface-active substances (surfactants) in the form of fringes [Bordini THAT. and other Methods to increase oil recovery by water flooding. - M.: Nedra, 1983, S. 47-49].

Known methods of insufficient effective when used for the development of heterogeneous oil reservoirs.

There is a method of developing a petroleum reservoir, comprising the sequential injection of an aqueous solution of alkali with nonionic surfactants (nonionic surfactants) and polymer with subsequent flooding and selection of oil through the production well. And after injection well stop for the process of capillary impregnation [U.S. Pat. Of the Russian Federation No. 2070282, CL E 21 In 43/22, 1996].

The disadvantage of this method is low efficiency when used in heterogeneous permeability oil reservoirs.

The closest in technical essence and the achieved effect is the oil extraction method, including injection into the formation via the injection well an aqueous solution of the chemical - ethoxylated carboxylic acids (COC) of General formula CnH2n+1COO (C2H4O)mH, where n=15-20, m=2-11 with a molecular mass of 344-810 or the L. E 21 IN 43/22, 2002].

The main disadvantage of this method is limited its application only to displace oil from a homogeneous permeability oil reservoirs.

The objective of the invention is to increase oil production in the development of oil fields with simultaneous decrease in water content of produced fluids by increasing the coverage of the reservoir pressure and displace the residual oil due to the solubilization process, as well as the exception to the use of expensive imported polymers in order to reduce the cost of extracted oil.

The problem is solved in that the oil extraction method, including injection into the formation via the injection well an aqueous solution of the chemical - ethoxylated carboxylic acids (COC) of General formula CnH2n+1COO (C2H4O)mN, where n=15-20, m=2-11 with a molecular mass of 344-810 or mixtures thereof, pushing aqueous solution into the formation water and oil extraction through production wells, in addition the injection of an aqueous solution of the chemical is injected organic solvent at a ratio of JCC, or a mixture thereof: organic solvent of 1:99-99:1, and after injection conduct technology exposure capossela of cellosolve, straight-run gasoline or any petroleum solvent, which is a component of straight-run gasoline, acetone, butanol.

The oil extraction method can be applied with high efficiency at the initial, middle and late stages of oil field development.

As the OCC can be used ethoxylated carboxylic acids produced by the domestic industry: Stearic-6 (GOST 8980-75 with amendments No. 1, 2, 3), Stearic-9 (TU 6-36-00203335-82-92), which are ethoxylated stearic acid with the number of hydroxyethyl links 6 and 9, respectively, and Sintex 1720-9 (TU 6-14-293-79), which is a mixture of ethoxylated synthetic fatty acid fraction C17-C20with the number of hydroxyethyl links 9-11 [Surfactant: a Handbook/Abramson A. A., Bocharov centuries, gaevoy, C. and others; Ed. by A. A. Abramson, and M. Gayova. - L.: Chemistry, 1979, - 307 S., TU 6-36-00203335-82-92, THE 6-14-293-79].

As the organic solvent can be used ethoxylated monohydroxy derivatives of aliphatic alcohols, such as ethyl cellosolve (GOST 8313-88), butylcellosolve (TU 6-01-646-84) and waste production (DEP), straight-run gasoline (fraction, wikipeida in predelete (GOST 2603-79), butanol-1 (GOST 5208-81), butanol-2 (GOST 9536-79), 2,2-DIMETHYLPROPANE (TU 6-09-4069-75).

Using the proposed method, the oil displacement occurs due to two mechanisms:

- alignment front of flooding and increase the coverage of the formation impact due to the reduction of filtration rate. The decrease in the mobility of water is achieved by increasing the structural-mechanical strength of the solution with the introduction of the COC;

- transfer of oil per volume of the rim by emulsification of the surface rocks in the presence of COC - surfactant, and an organic solvent.

Thus, the displacement of oil in the proposed method is due to the manifestation of the COC and a thickening agent, and a surfactant (emulsifying properties.

An example of the method: neprevidennie conducted on homogeneous models of the reservoir with a length of 25 cm and a diameter of 1.5 cm, filled with terrigenous rock. Samples of the porous medium under vacuum saturated with formation water with a total salt content of 55 g/l bulk Permeability model of 1.3 μm2. Then under vacuum, the sample reservoir is saturated with oil viscosity 220 mPas to residual oil saturation. When the vertical position of the reservoir model vitest flooding 18%). Then in the model pumped a slug of an aqueous solution of the chemical reagent with an organic solvent in a quantity equal to one pore volume, stop the discharge process for a time sufficient for the occurrence of gelation processes and capillary impregnation, and push it with tap water until the water coming out of the fluid sample from the model. The effectiveness of the composition is determined by additional crude oil and expect growth CNAS (the recovery factor).

Table 1 presents data on the qualitative and quantitative content of components in the compositions used in this method of oil production, table 2 presents data on viscosity characteristics and efficiency of oil displacement by the proposed method and the prototype.

In the case of the implementation of the prototype method using an aqueous solution JCC of 0.5-1.0% concentration to displace oil with a viscosity of 220 mPas neprevidennie spent on oil with a viscosity of 22 mPas, the recovery factor is 3.8 and 9.3.

As can be seen from table 2, the use of the proposed method models the homogeneous reservoir, saturated oil with a viscosity of 220 mPas, oil-driving effect was emich stocks increases the share of oil in production wells while maintaining the flow rate of the liquid and, as a consequence, a reduction in water cut.

The way technology from the point of view of the injection of the chemical into the reservoir, does not require additional costs for construction trades, effective in areas where the water cut of the production wells is 100%.

It should also be noted that the use of the method of the JCC, with surface-active properties, can reduce the stability of the emerging oil-water emulsion in the production wells without additional dosage of demulsifier (PL.3). This, in turn, will significantly reduce costs in the preparation of the oil.

From the above data (table.2) shows that this method allows to increase the coverage of the reservoir flooding, increase the oil recovery factor in comparison with the prototype, more economical.

1. The oil extraction method, including injection into the formation via the injection well an aqueous solution of the chemical ethoxylated carboxylic acids COC General formula CnH2n+1COO(C2H4O)mH, where n = 15-20, m = 2-1 1 with a molecular mass of 344-810 or mixtures thereof, pushing aqueous solution into the formation water and oil extraction through production wells, different is compared the JCC, or a mixture thereof : organic solvent = 1:99-99:1, and after injection conduct technology exposure specified water solution.

2. The method according to p. 1, characterized in that the organic solvent used cellosolve or waste production cellosolve, straight-run gasoline or any petroleum solvent, which is a component of straight-run gasoline, acetone, butanol.

 

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SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

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25 cl, 1 tbl, 3 ex

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EFFECT: increased oil recovery.

2 cl, 2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: composition contains 0.05-2.5% of hydrophobic power, 0.05-10% of ethylene/vinyl acetate copolymer, and organic solvent. Composition intensifies oil production owing to increased effective radius of formation bottom area treatment, prevention of moistening inversion effect upon fall of hydrophobic agent concentration, and, consequently, decreased volume of simultaneously produced water.

EFFECT: increased oil production, prolonged overhaul period, improved environmental safety, and lowered production expenses.

2 tbl, 3 ex

FIELD: oil and gas extractive industry.

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2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

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EFFECT: higher efficiency.

2 tbl, 2 ex

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