The composition for enhanced oil recovery

 

(57) Abstract:

The invention relates to the oil industry, in particular secondary and tertiary methods of improving oil recovery by reservoir stimulation by bioreagents. The technical result is to increase the efficacy of bioreagent reservoir by improving its biochemical activity and increase coverage of reservoir flooding. The composition for enhanced oil recovery contains, wt%: excess activated sludge after secondary clarifiers biological treatment facilities of 0.2 - 1.0, powdered activated carbon 0,08 - 0,1, water the rest. As the water composition may contain radilovo liquid and biochemically purified water. When used together, these components improve the sedimentation characteristics of activated sludge, accelerate biochemical processes, improves the transfer of oxygen are involved in metabolic processes resistant to biochemical destruction of the substance, in addition, PAHs can be carriers of microorganisms and thereby improve the hydraulic them into the formation. 1 C.p. f-crystals, 4 PL.

The invention relates to the oil industry, in particular to microbioloy the basis of biological waste treatment facilities (BOS), in particular, the excess activated sludge after secondary settling tanks (U.S. Pat. Of the Russian Federation No. 1755615, CL E 21 In 43/22).

The disadvantage of this structure is a short-term biochemical activity due to the lack of oxygen to the activity of aerobic microorganisms, which leads to inhibition of the activity of anaerobic microorganisms, which in the course of their life mainly use the products of metabolism of anaerobic microorganisms.

The closest in technical essence and the achieved result is a composition for increasing oil recovery (patent RF №2176019, CL 7 E 21 In 43/22), in which as the source of microorganisms used surplus activated sludge after secondary settling tanks barefoot, and as an agent that increases the biochemical activity of the composition - distillation residues from the production of synthetic glycerin polyglyceryl (GHG).

The disadvantage is the complexity of making it because of the lack of commodity forms of GHGs and the untimely operation of the production. A significant drawback is the presence of oxidation-resistant microorganisms nutrient - light polyglycerins that contribute to short-course is their drops sharply and sludge microorganisms do not have time to adapt to the use of fluids and hydrocarbon oil.

The aim of the invention is to increase the biochemical activity of the composition for a long period. The technical result is to increase oil-driving ability of the composition by increasing its biochemical activity and increase coverage of reservoir flooding.

The purpose and the technical result is achieved by the fact that the composition for enhanced oil recovery reservoir containing excess activated sludge with water after secondary settling tanks barefoot and water further comprises powdered activated carbon (PAH) (grade AG-5, AG-3, CR-iodine and others) in the following ratio, wt.%:

Excess activated sludge after secondary

clarifiers bare 0,1-1,0

Powdered activated carbon 0,08-0,10

Water The Rest

The quality of water it can contain radilovo liquid and biochemically purified water.

Powdered activated carbon is widely used as an intensifier biochemical processes in wastewater treatment. This combined method is called biosorption.

Numerous studies of biosorption revealed a number of advantages of this method of intesol, increased physiological activity of attached bacterial cells compared to free-floating, increasing the concentration of the substrate due to its adsorption on the surface of PAH, enriching environment eksperimentami (sorbed on the surface PAH), involvement in metabolic processes resistant to biochemical destruction of substances, improvement of oxygen transfer and high efficiency of removal from wastewater of various organic and inorganic substances.

In table. 1 shows the physico-chemical properties of some PAHs.

The composition is prepared by introducing into an aqueous solution of excess activated sludge (sludge concentration of 0.2 - 1.0 wt.%) and PAHs at concentrations of 0.05 - 0.10 wt.%. Before the introduction of the sludge PAHs were ground and sifted through a sieve with a mesh size of 0.25 mm

Example 1. In the cylinder Lisenko or in a graduated cylinder 100 ml of injected solution of excess activated sludge 99,95 g and 0.05 g of PAH (at the rate of 0.05 wt.%) and the mixture was thoroughly stirred. Then after a certain period of time point the volume occupied by the settled sludge. As a control (prototype) 100 g of a solution of excess activated sludge contribute in the same cylinder. After 90 min the volume of the settled sludge in the experience (this CO2">Example 2. In the conditions of example 1 contribute in the same cylinders (one of which is a control - prototype) 0.08 g, 0,010 g and 0.15 g of PAH and 99,92; 99,90; 99,85 g of an aqueous solution of excess activated sludge.

The overall results Labratory studies the positive impact of PAH on academist excess activated sludge (IIA) are given in table. 2.

From the data table. 2 shows that the IIA (composition No. 1 according to the prototype, without the introduction of PAH settles poorly, the liquid above the sludge cloudy with impurities suspended silt particles, and the proposed composition No. 3, 4, 5 effective, especially compounds No. 3, 4.

In table. 3 shows the results of researches of influence of some PAH at a concentration of 1000 mg/l on the main characteristics of the IIA.

From the data table. 3 shows that the addition of PAH in the IIA improves sludge characteristics, in particular significantly reduced the rate of oedemata sludge - sludge index and increases the total number of microorganisms (TBC). Improved performance of IAS will contribute to the reduction of time of adaptation of microorganisms sludge to difficultly oxidizable compounds and simultaneous increase of the effect of biodegradation, i.e., the addition of PAH in the above end is due to the fact, the surface PAH, its adsorption abilities and skills contribute to the oxygen enrichment of air, which obviously contributes to the lengthening of the period of aerobic microbial processes in the reservoir and ultimately will result in increased oil recovery.

The biochemical activity of the composition was investigated by changing the values of COD (chemical oxygen demand - a measure of the total amount of dissolved organic matter and nitrification (the transition of ammonium nitrogen to nitrate nitrogen).

The overall results of studies of the effect of PAH at a concentration of 800 mg/l of IAS are given in table. 4.

As can be seen from the data table. 4, the introduction of various brands of PAH at a concentration of 800 mg/l is better biodegradation and the intensification of the process of nitrification, which indicates the acceleration of the process of biochemical oxidation of organic matter and a deeper decomposition with formation of an intermediate (alcohols, aldehydes, acids and others) and gaseous (methane, carbon dioxide and other) end products of metabolism, which in turn can be oil-driving agents and will contribute to the increase of additional crude oil from the reservoir.

Such as by improving selectively bridging ability of activated sludge and increasing the coverage of the reservoir water flooding while improving biochemical activity and the increase in oil-driving ability of the composition.

1. Composition for enhanced oil recovery reservoir containing excess activated sludge after secondary clarifiers biological wastewater treatment plants and water, characterized in that it further comprises a powdered activated carbon in the following ratio, wt.%:

Excess activated sludge 0,2-1,0

Powdered activated carbon 0,08-0,10

Water The Rest

2. Composition under item 1, characterized in that the quality of the water it contains radilovo liquid and biokhimicheskoy water.



 

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FIELD: oil and gas production.

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EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

8 cl

FIELD: oil and gas production.

SUBSTANCE: invention aims at increasing productivity of oil- and gas-producing and injecting wells exposing high-temperature low-permeable oil reservoirs. In the treatment method according to invention including forcing enzyme substrate and separate enzyme into formation and creating conditions to enzymatically convert substrate into acid, geologic and productive characteristics for each interval of bottom zone are determined in order to pick out low-permeable intervals of oil reservoir for treatment, whereupon properties of enzyme substrate and separate enzyme as well as conditions for their pumping are chosen. Substrate utilized in the method is head fraction of methyl- and/or ethyl-, and/or butyl acetate production, to which aliphatic alcohols are added, and enzyme is an acid solution. Substrate is pumped simultaneously and/or before, and/or after pumping of enzyme, after which well is closed for some time and then opened and placed under predetermined operational conditions.

EFFECT: enhanced efficiency of acid treatment due to increased phase permeability for oil and deepness of active acid-treated zone of low-permeable oil reservoirs.

25 cl, 1 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: invention is intended for use during development of oil pools at different waterflooding phase for intensifying functioning of producing wells and increasing current oil recovery of formation. Composition contains, wt %: liquid hydrocarbon 10.0-20.0, oil-soluble surfactant 0.3-5.0, water-soluble or water-oil-soluble surfactant 0.1-1.0, superfine hydrophobic material 0.1-2.0, and water (the rest). Composition may further contain 0.3-5.0% calcium chloride. Oil recovery is increased owing to hydrophobization of formation structure, reduction of surface tension in water/rock/oil phase boundary, increase in detergent power of polluted surface, increase in composition viscosity, and increase of relative permeability of the formation for hydrocarbon phase as compared with water phase.

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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7 cl, 5 dwg

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

2 cl, 2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes examination of operation well for gas-condensation and periodical cleaning of face-adjacent well area from precipitating hydrocarbon condensate by pumping hydrocarbon condensate solvent into bed, exposure of well for period of condensate dissolution and following removal of received solution from face-adjacent area during well launch, as solvent binary mixture is used with unlimited mutual solubility of components, while at least one of them has unlimited mutual solubility with hydrocarbon condensate, and relation of binary mixture components is determined from previously built phase diagram of three-component system, formed during dissolution of hydrocarbon condensate. As binary mixture with unlimited mutual solubility of components a mixture of acetone and methanol is used, or chloroform and methanol, or chloroform and aniline, or chloroform and acetone.

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2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes placing water solution of carnallite ore, either modified, concentrated, or mixtures thereof, said solution is used at maximal for well temperature conditions concentration and is pumped in amount, necessary and enough for forming a hydraulic column in well shaft above ceiling of productive bed and along remaining shaft height well is filled with water up to mouth. Carnallite ore used has composition, in percents of mass: potassium chloride 20.5-21.5; sodium chloride 19.5-22.5; magnesium chloride 24.0-27.0; crystallization water 29.5-30.5. Modified ore has composition, in percents of mass: potassium chloride 23.0-29.5; magnesium chloride 31.8-46.0; crystallization water - the rest. Said water solution is prepared by dissolving ore in fresh technical water, drained from oil preparation plants, or in bed water. In case of dissolving in bed water, the latter is pumped from well at temperature 60-90°C. During perforation of well, value of technological liquid hydraulic column above productive bed ceiling is taken equal to (1.03-1.07)-(1.05-1.1)Pb, where Pb - productive bed pressure. Water solution of carnallite ore is used at density 1.23-1.37 t/m3. During use of said solution as working body of force wells it is used at density 1.05-1.20 t/m3, and solution also contains swelling inhibitor for argillaceous component of oil and gas bearing bed, like oxyethylenedendiphosphone acid, in amount 0.05-0.15% of used dissolved ore mass.

EFFECT: higher efficiency.

1 cl, 4 ex

FIELD: oil industry.

SUBSTANCE: method includes treatment of face area of oil bed by hydrophobic agent in organic solvent and pressing oil from collector with following delivery of oil from face area of product well for treatment of oil terrigenic bed, in form of hydrophobic agent solution of ethylene copolymer with vinylacetate in ethylbenzol or fraction thereof is used in relation 1:1 - 10, treatment of face area is performed with following ratio of components, in percents of mass: ethylene copolymer with vinylacetate 0.05-2.0, ethylbenzol or fraction 0.05-20.0, organic solvent - the rest.

EFFECT: higher efficiency.

2 tbl, 2 ex

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1 dwg, 2 tbl

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