Reagent for increasing oil producing formations

 

The invention relates to the oil industry and can be used to enhance oil recovery, in particular for heterogeneous reservoirs at the late stage of the field development. The technical result is to increase the quality of the reagent by improving its main technological parameters: the reduction of interfacial tension on the border with hydrocarbon adsorption Nagorno breed, raise laundering abilities while increasing sweep impact. Reagent for increasing oil producing reservoirs on the basis of lignin contains, by weight.h.: lignin hydrolysis 4, sulfonic acid 1. table 2., 1 Il.

The invention relates to the oil industry and can be used to enhance oil recovery, in particular for heterogeneous reservoirs at the late stage of its development.

Famous oil-driving agent for the non-flooded reservoirs containing carboxymethylcellulose and crosslinked polyacrylamide [1].

The disadvantage of this reagent is low efficiency due to the lack of such important parameter for oil-driving reagent as laundering capability.

From the m of this reagent is not sufficiently low interfacial tension on the border with hydrocarbons, determining the effectiveness of the displacing reagent, as well as its low viscosity, resulting in displacing the solution is filtered by high-permeability zones of the reservoir.

The objective of the invention is to improve the quality of the reagent by improving its main technological parameters: the reduction of interfacial tension on the border with hydrocarbons adsorption on the rock, increasing laundering abilities while increasing sweep effect.

This object is achieved in that the reagent for increasing oil producing reservoirs on the basis of lignin according to the invention contains lignin hydrolysis and optionally - sulfonic acid in the following ratio, wt.h.: The hydrolyzed lignin - 4 sulfonic acid - 1 lignin (CH) - waste production of hydrolytic alcohol is a fine powder dark brown color, is a multifunctional complex substance containing active biphenylene and ligninase patterns. It contains up to 5% fenilnyh hydroxyl and 10% metaxylene and carboxyl groups. The particle size distribution of from 0.2 to 0.5 mm

The sulfonic acid powder technical manufactured according to TU 07510508.135-98 contains 80-95% and the CH: sulfonic acid 4:1. For making preemptive composition with elevated technological parameters it is enough to add water to 2.5% of the proposed reagent. When preparing a preemptive solution with a concentration of 2.5% in the solution will contain 2,0% CHAPS and 0.5% of the sulfonic acid.

To establish the effectiveness of the reagent was determined the main technological parameters: interfacial tension, adsorption, laundering the ability of characterizing the quality of displacing composition, prepared on the basis of the proposed reagent.

The solutions prepared in the following way. A portion of the dry reagent is dissolved in a technical or produced water and maintained at a temperature of layer (40-100oC) for several hours, sufficient for the extraction of chemically active substances of hydrolytic lignin.

Interfacial tension of solutions of the proposed reagent on the border with oil was determined stalagmometer method (method of drop detachment). The dependence of the rate of interfacial tension on the concentration of the components in the reagent composition shown in table 1, which shows that with increasing concentration of the aqueous solution of the sulfonic acid to 1.0% not achieved this reduction of interfacial tension as a 2.5% solution Safonova apparent synergistic effect (mutual enhancement of the properties of each component in the presence of another). The results of the research are illustrated in the graph, where it can be seen that the interfacial tension of sulfonic acid on the border with oil in the presence of 2% CH reaches the minimum value of 0.01 mn/m, which is lower in order than the prototype. Further increase in the concentration of CH in solution more than 2% leads to an increase in interfacial tension. This reduction of the interfacial tension on the border with oil is achieved only in micellar solution (0.05 mn/m), which provides the highest ratio of oil displacement [3].

Defined adsorption and laundering the ability of displacing compounds prepared from the proposed reagent. Adsorption is an important characteristic, because, traversing the collector, the surfactant is adsorbed on the rock, losing laundering ability. Adsorption is determined by measuring the surface tension of the investigated solution before and after soaking it with the adsorbent. The determination was carried out on the disintegrated clay Sandstone fraction of 0.2-0.3 mm with a ratio of adsorbent:a solution of 1:3, i.e. 15 g of the adsorbent have 45 ml of the investigated solution. The test sample was cured in a thermostat at a temperature of 70oC for 1 day. During this time achieved RA is s (model centrifuge W, 2500 rpm): 5 g saturated oil sand is placed in a graduated centrifuge tube and fill to a certain point displacement composition. Measure the amount of laundered oil on the calibration scale.

The results of the studies are shown in table 2, show that a solution containing 2.5% of the reagent, which corresponds to 0.5% of the sulfonic acid + 2% CH (experiment 3), has the lowest rate of adsorption -3,3 mg/g, the best relative laundering capacity 70% and very low interfacial tension of 0.01 mn/m2.

The viscosity of the solutions proposed reagent is 5-7 mn/m2(table 2). The determination was carried out on viscometric system RM Rheomat 180 from the original solution.

Geological composition of productive layers many of the deposits are characterized by alternation of permeable and poorly permeable interlayers, not involved in the development, therefore, the displacing part (prototype) having a low viscosity, is filtered by high-permeability zones of the reservoir.

Lignin is a dry powder with a moisture content not exceeding 6%, dispersed composition is 0.2 - 0.6 mm, so its solutions are a suspension, which, having a high viscosity, colour additional stabilization.

Preemptive composition prepared based on the proposed reagent has improved technological parameters: interfacial tension on the border with hydrocarbons adsorption on the rock, high detergent power.

The proposed reagent workable and suitable for use in field conditions: 1) ease of preparation; 2) the components included in it, have a low hygroscopicity; 3) long shelf life.

The proposed reagent will increase oil recovery and reduce the water content of products produced by Tootmine residual oil and increase sweep impact through involvement in the development of low-permeability zones of the formation.

Sources of information 1. RF patent 2159325, IPC E 21 In 43/22, 2000

2. U.S. patent 5230814, IPC E 21 In 43/22, 1993 prototype.

3. Surguchev Masonic lodges and other Methods of extraction of residual oil. - M.: Nedra, 1991, S. 149.

Claims

Reagent for increasing oil producing reservoirs on the basis of lignin, characterized in that it contains hydrolyzed lignin and advanced - sulfonic acid in the following ratio, wt.h.: The hydrolyzed lignin - 4 sulfonic acid - 1E

 

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FIELD: oil and gas production.

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.

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.

SUBSTANCE: method includes pumping of Sulfacella water dispersion into bed through force well and extraction of oil through extracting well, said dispersion additionally containing non-ionogenic surfactant AF9-12 with following ratio of components, in percents of mass: Sulfacella 0.5-1, AF9-12 0.01-0.1, water- the rest, while, before pumping of said dispersion mineralized water is pumped with total mineralization until 290 g/l in amount of 10% from volume of said dispersion, when pumping said dispersion prepared in fresh water, drain water is previously pumped, and when pumping said dispersion made from drain or bed water, bed water is previously pumped. For preparation of said dispersion fresh, drain or bed water is used with mineralization till 290 g/l.

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.

EFFECT: higher productiveness.

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 60-90C. 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

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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.

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2 tbl, 2 ex

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EFFECT: increased yield of biogas to continuously effecting culturing of microorganisms.

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