The composition for regulating the development of oil fields

 

The invention relates to the oil industry, namely to slit the development of oil fields. The technical result is to improve the rheological properties of the composition, improve the elasticity of the composition, which in turn leads to its strength. The composition for regulating the development of oil fields, including exopolysaccharide containing 1-30 wt.% uronic acids and produced by Azotobacter Vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, chromalive alum and water, the composition further comprises a surfactant surfactant of the class of ethoxylated esters sorbitan General formulawhere+x+y+z=20; R - monolaurate, monopalmitate, monooleate, trioleate, linoleate, when the ratio of components in the composition, wt.%: the specified exopolysaccharide of 0.001 to 1.0, chromalive alum of 0.002 to 0.04 specified surfactant 0,02 - 0,1, water the rest. table 1.

The invention relates to the oil industry, namely to downhole oil field development.

Known gel-forming composition for the treatment of oil wells, containing a simple ester of cellulose, an inorganic salt of a trivalent chromaticities, goldirova acetylcellulose or a mixture of carboxymethylcellulose with acetylcellulose and optionally sodium or potassium salt of hydrochloric or nitric acid and the sodium or potassium salt of orthophosphoric acid.

The main disadvantage of the composition is its complexity, the complexity of obtaining and expensive. In addition, the instant after mixing the components gelation excludes the injection of a specified composition in deep low-permeability reservoirs.

To isolate the flow of formation water into the well used biopolymers, such as solutions heteropolysaccharide produced by Xanthomonas campestris (ed.mon. The USSR 1051226) Acinetobacter sp (ed. St. USSR 1726732).

Known heteropolysaccharides, including xanthan gum, do not provide the desired changes in filtration resistance with all the variety Geologorazvedka conditions.

Known composition for insulation of water in the well containing an aqueous solution of polyacrylamide and as a cross-linking agent chromalive alum (ed. St. USSR 985255).

However, this composition is not effective at low concentrations of polymer and because of the active cation adsorption of chromium on the threshold of the high concentration of polymer, etc is, s is a composition for regulating the development of oil fields, including exopolysaccharide containing 1-30 wt.% uronic acids and produced by Azotobacter Vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, chromalive alum and water (U.S. Pat. RF 2107811). The ratio of components in the composition, wt.%: The exopolysaccharide is 0.001 to 1.0 Chromalive alum of 0.002 to 0.04) Water - the Rest to 100% But this composition is not effective enough, because at high concentrations of polymer, crosslinked chromalive alum, a composition for injection into the reservoir has reduced strength and fragility.

The purpose of this invention is to improve the rheological properties of the composition, improve the elasticity of the composition, which in turn leads to its strength.

This objective is achieved in that the composition of the prototype further comprises a surfactant surfactant of the class of ethoxylated esters sorbitan General formulawhere+x+y+z =20;
R - monolaurate, monopalmitate, monooleate, trioleate, linoleate.

The ratio of the components in the following composition, wt.%:
The specified exopolysaccharide is 0.001 to 1.0
Chromalive alum of 0.002 - 0.04
The specified surfactant - 0,02 - 0,1
Water - the Rest is up to 100%
The proposed use of surfactants can paucity composition, allows you to adjust the time of the formation of elastic-dimensional structures in a wide range of geological and physical conditions of formation.

The exopolysaccharide containing 1-30 wt.% uronic acids and produced by Azotobacter Vinelandii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid, has a high gelling properties, which unfortunately you cannot save at elevated temperatures and high shear stresses.

To eliminate this drawback allowed use in the composition of the surfactants mentioned formula, through which came the joining of polymer molecules with molecules of alum with the formation in solution is very flexible and extensive grid.

The proposed solution is illustrated by the following examples,
Example 1
Previously carried out in a known manner biosynthesis of exopolysaccharide content of uronic acids in the range of 1-30% by using a strain of Azotobacter Vinelandii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid (U.S. Pat. RF 2073712).

Example 2
Preparation of composition in laboratory conditions was carried out as follows: in a glass beaker with a stirrer was filled culture fluid of exopolysaccharide from example 1 and water. After thorough mixing in startnodes mass. Thus prepared composition was divided into two parts:
first thermostatically at 20oC and the second at 60oC. After gelation was determined maximum shear stress on the device Rhcogel-90M.

Examples of compositions and the results are given in the table.

In field conditions the most obvious proof of the success of the insulation composition may be either a change in water content of produced fluids (when processing the production well), or change the injectivity profile (when processing the injection well) with the injection of compounds with subsequent reduction of the water content of fluid in the producing wells.

Preparation of the solution of the proposed structure on the fishery was carried out in tanks cementing unit, connected to the discharge hole and provided with a pump for mixing. After homogeneous pump bring the resulting solution through a column of tubing to the bottom hole and push it into the reservoir. As squeezing the liquid used fresh water.

Experimental injection at the field in Tatarstan showed that the application of the proposed Sechenovo composition, in the processing of injection wells redistribution in the injectivity profile and reducing the water content in the producing wells by 10-40%.


Claims

The composition for regulating the development of oil fields, including exopolysaccharide containing 1-30 weight. % uronic acids and produced by Azotobacter Vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, chromalive alum and water, wherein the composition further comprises a surfactant surfactant of the class of ethoxylated esters sorbitan General formula

where+x+y+z= 20,
R - monolaurate, monopalmitate, monooleate, trioleate, linoleate, when the ratio of components in the composition, wt. %:
The specified exopolysaccharide is 0.001 to 1.0
Chromalive alum of 0.002-0.04
The specified surfactant - 0,02-0,1
Water - The Rest

 

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FIELD: biotechnology.

SUBSTANCE: invention is directed to using microbiological methods in petrochemical field and can be used to simultaneously prepare vitamin-rich biomass and dewaxed component of motor fuel. Method of invention consists in that yeast, preparing Candida maltoza, is grown under aeration conditions nutritive medium composed of, mg/L: phosphorus 120.0, potassium 20.0, magnesium 33.0, iron 20.0, zinc 6.0, manganese 2.9, residual nitrogen 190.0, and petroleum distillates, as carbon source wherein ratio of n-alkanes to aromatic hydrocarbons ids 1:(1-3). Cultivation is carried out in flow mode at flux velocity 0.12-0.3 h-1.

EFFECT: increased yield of biomass and protein content therein at no loss in quality of motor fuel.

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