The composition for treatment of bottom-hole formation zone

 

The invention relates to the oil industry, in particular to compositions for treatment of bottom-hole formation zone, and can also be used to isolate the flow of water into wells and regulation of oil field development. The technical result is to increase the structural viscosity and increase thermal stability of the composition, as well as changes in wettability, that is, the increase of waterproofing composition and improve adhesion to the breed that will reduce the permeability of water-saturated layers and increase the hydrophobicity of the surface of the breed, and due to the high oil-driving properties of the composition will increase the relative permeability of the formation to hydrocarbon phase is compared to water. The composition for treatment of bottom-hole formation zone contains, wt%: oil-soluble surface-active substance NAV 1,0 - 15,0, silicone substance or soluble or colloidal sodium silicate 0,5 - 18,0, Policy 0,1 - 2,0 and water the rest. The composition may additionally contain calcium chloride in the amount of 1.0-10.0 wt.% and a hydrocarbon solvent in the amount of 2.0 to 15.0 wt.%. 2 C.p. f-crystals, 5 PL.

The invention relates to the oil industry is the influx of water into wells and to regulate the development of oil fields.

Known acidic surface-active compound for the treatment of bottomhole injection and production wells (RF patent No. 2013527, E 21 In 43/22,1994), containing Netanya-N 2-8 wt.%, hydrochloric acid 92-98 wt.%.

When mixing the components, the result is an acidic surfactant system with low structural viscosity, the application of which is ineffective on fields with high permeable rock.

Known composition of the surface-active composition.with. The USSR №1623278, E 21 In 43/22, 1992), containing sadomasochistic anionic surfactants, oil-soluble nonionic surfactant, a hydrocarbon solvent and water.

The composition has good oil-driving ability, but has a low structural viscosity, therefore, does not create effective resistance water in a porous medium.

Known composition containing liquid glass with ammonium bicarbonate (U.S. patent No. 207759, 1940), as well as the composition, in which the polymerization of the silicate of potassium cause salts such as chlorides and sulphates of potassium and lithium (U.S. patent No. 2392767, 1946).

These compounds have a significant disadvantage - poor filterability in porous media due to the rapid formation of gel particles polysilicon acid and, as a consequence, low effective is -99,80 wt.% Olkiluoto ether of ortho-silicic acid and from 0.2 to 0.95 wt.% hydrochloric acid (U.S. patent No. 2229177, CL 166-21, 21.01.1941). Hydrochloric acid catalyzes the hydrolytic polycondensation reaction, in which a gel is formed polysilicon acid.

Known composition containing oil-soluble organosilicon: 75,0-99.9% of tetraethoxysilane and of 0.1 to 25.0 wt.% organochlorosilane (and.with. THE USSR №859612, E 21 IN 43/22).

Upon contact of the components with water in the reservoir hydrolysis occurs, sedimentation and / or gel formation, which blocks high-permeability reservoirs.

A significant disadvantage of these compositions is poor filtration in porous media due to the rapid formation of gel particles polysilicon acid and, as a consequence, low efficiency and narrow the scope of it and the high consumption of expensive silicone substances.

Known composition containing 1-40 wt.% the hydrocarbon solvent and the rest water.with. NO. 1623280, E 21 IN 43/22, 1987).

This composition is a finely dispersed emulsion of the type oil-in-water", which has a low rheological, and therefore insulating properties, and not to be stable at high temperatures.

The closest in technical essence and the achieved result is a composition for treatment of bottom-hole zone of the AB may contain optionally a hydrocarbon solvent in the amount of 2-10 wt.% (patent RF №2112871, E 21 IN 43/22, 43/32, 10.06.98).

The technical result is to increase the structural viscosity and increase thermal stability of the composition, as well as changes in wettability, that is, the increase of waterproofing composition and improve adhesion to the breed that will reduce the permeability of water-saturated layers and increase the hydrophobicity of the surface of the breed, and due to the high oil-driving properties of the composition will increase the relative permeability of the formation to hydrocarbon phase is compared to water.

The technical result is achieved in that the composition for treatment of bottom-hole formation zone, including oil-soluble surface-active substance NAV, silicon-containing substance and water, which as a silicon-containing substance containing organosilicon substance or soluble or colloidal sodium silicate, and optionally - Policy in the following ratio, wt.%:

NAV 1,0-15,0

silicone substance or

soluble or colloidal

sodium silicate 0,5-18,0

Policy 0,1-2,0

water the rest

The composition optionally may contain calcium chloride in the amount of 1.0-10.0 wt.%.

The composition may further comprise a hydrocarbon solution is odny solution of esters of acids of tall oil and triethanolamine; neonols AF94-6 - nonionic nonylphenols, ethoxylated 4-6 moles of oxyethylene; and Neftekhim 1, 3, containing a complex mixture of derivatives of carboxylic acids, lung tall oil and salt piperizine of these acids in the solution of kerosene and catalyzate reforming; oil-soluble petroleum sulfonates with MM=600-700, synthetic alkylarylsulfonate (for example, alkylnaphthalenes), emulsifier sinol EM containing hydrocarbon solution of the product of the interaction of the acids of tall oil with triethanolamine and urea, alkylchloride and oxide alkyldiphenylamine and other oil-soluble surface-active substances.

As organic substances are used as water-soluble silicone emulsion EC 20-03 (TU 6-0505763441-96-93) - 70% water emulsion polyethylsiloxane liquid PES-5 and the composition of ethoxysilane (TU 6-00-05763441-45-92), entitled "product 119-296 T, and oil-soluble ethyl silicate - 40 ETS-40 (GOST 26371-84) - homogeneous mixture preparation; a complex mixture of tetraethoxysilane and preparation of ethyl silicate - 32 ETS-32 (TU 6-02-895-86)); water-repelling silicone fluid NGL-11N (TU 6-000491277-101-97) aqueous solution methylsiliconate Neorganicheskie resin 139-297 - solutions polyphenylsiloxane resin in orthoxylene (TU 6-02-1-026-90) and polymethylphenylsiloxane resin 134-276 in hydrocarbon solvent (TU 6 02-1360-87), oligoorganoethoxy-(chloro)-siloxanes called "product 119-204" TU 6 02-1294-84.

Technical soluble sodium silicates include orthosilicate (Na4SIO, SIS4), metasilicate (PA3SiO2), disilicate (Na2SiO2and more siliceous products, the ratio of which is close to Na2·4SiO2. One of the most common types of sodium silicate, for example, soluble glass contains oxides in the ratio of Na2O·3.3V SiO2. This product, which is produced in the form of a viscous solution containing about 28% SiO2used as a binder in water purification, for the preparation of silica gel and other needs and is called liquid glass.

As silicates use a solution of high modulus of liquid glass "Silina -30" (TU 2145-002-13002578-93), colloidal sodium silicate mark "Sialic-30-5 (TU 2145-002-43811938-97) soluble powder of hydrated sodium silicate "Sialic-60-3 (TU 2145-004-43811938-99), the solution of low-modulus glass brand "Silina-M or powder frost glass brand "Nomac", (TU 2145-015-13002378-95) and other soluble is depending on how modifications can have a hydrophobic (POLYSIL-SE), vfilename (Policy-DF) and superfeminine (Policy-SF) properties.

Policy is a trademark of chemically modified silica (SiO2) (Trademark "Policy", certificate No. 196999 from 06.12.2000 year).

Policy-P1 has a strong hydrophobic and organophilic properties, which means it represents a fine powder on the basis of silicon dioxide, chemically modified organosilicon compound has a bulk density a 0.035-0.14 g/cm3particle size of 0.005 to 0.04 μm, specific surface area 300 m2/g, the effective contact angle for the surface-treated Policrom-P1 140-170° C, operating temperature range-60 to+180°C, the degree of hydrophobicity is 99% (THAT 2169-001-0470693-93).

Policy-DF has the properties of a solid nonionic surfactants due to the chemical structure of the grafted surface layer possesses emulsifying properties, has a bulk density a 0.035-0.14 g/cm3particle size of 0.005 to 0.04 μm, specific surface area 300 m2/g, the effective contact angle for the surface-treated Policrom-DF 0° operating temperature range-60 to+180°C, the degree of hydrophobicity is 100% (THE 2311-002-04706-93).

Policy-SF has superfeminine organopolymer properties, is a fine the size of the particles of 0.005 to 0.04 μm, specific surface area of 300 m2/g, the effective contact angle for the surface-treated Policrom-SF 90-120° C, operating temperature range-60 to+180°C, the degree of hydrophobicity is 40-50% (TU 2311-002-04706-93).

Modified dispersion materials brand Policy are chemically inert powders that will have no adverse impact on human health and the environment, in accordance with the "Primary Toxicological-hygienic passport new connection", approved by the RF Ministry of health, this class of materials is according to GOST 12.007-76 to the fourth class of low-hazard substances. Storage conditions of Policie: dry location at temperatures from -50 to +50°C.

The mechanism of formation of silica gel was studied by a number of authors and is described by the author R. K. Aileron "the Colloid chemistry of silica and silicates", Moscow, 1959, and are well represented in the closest analogue.

Prospects and high efficiency reverse emulsions for treatment of bottom-hole formation zone is proved by laboratory tests and field treatments. This is due to a number of their positive qualities: first, the dispersed nature of inverse emulsions allows them to selectively filter in the most permeable zones PL is in the filtering process in the depth of the reservoir and, on the contrary, for liquefaction at dispersing the oil, which ensures their high selectivity; third, the presence in their composition of MPAS with high adhesion to hydrophilic rock formation in the water-washed areas gives them the ability as when driving on the filtration channels and after decomposition to gidrofobizirovan skeleton manifold increase in its permeability to oil and reduced to water.

Unlike most similar analogue, which is used kremniiorganicheskie substance, liquid glass brand "Silina-30", to improve the efficiency of reverse emulsions features a composition for treatment of bottom-hole formation zone, where the silicon-containing component can be used as silicone, and kremniiorganicheskie soluble or colloidal sodium silicate, and as MPAS can be used as the anionic NAV (neprinol-H3, Neftekhim, etc), so the nonionic NAV (neonol-OF-4-6 and others), or mixed type (sinol GM - mixture of anionic and neionogennogo NAV and others).

As a result of reaction of the silicon-containing substances with electrolytes in the composition of the emulsions formation of a gel mass polysilicon acids, which increases the viscosity of the var who are rheological properties.

With the introduction of the proposed composition of the organic substances, such as tetraethoxysilane, in the composition of the emulsion hydrolysis reaction is accompanied by further condensation obrazovavshikhsya of silanols education polyalkoxysiloxanes and ultimately silica.

The hydrolysis reaction tetraalkoxysilane usually occurs in the presence of catalysts, inorganic acids and alkalis. In many of the used emulsifiers include the free acids of tall oil, as a result of exchange reactions is the conversion of alkoxygroup Si-OR in allograph Si-OCOR. The hydrolysis rate of alloctype higher than alkoxygroup, and the hydrolysis proceeds without catalyst.

When using the proposed composition of the soluble or colloidal sodium silicate interact with aqueous solutions of electrolytes included in the composition of the emulsion formed monocerata acid, which is unstable and undergoes polymerization and formed different in composition and structure of the polysilicon acid.

Macromolecule silicon-containing polymers have a high flexibility and small forces of intermolecular interaction. Such molecules form a globular structure in composition d is containing a series of polymers, adsorbed on the surface section of the oil and water form a gel-like film that has mechanical and chemical resistance and stabilizes the emulsion.

This leads to the reduction of interfacial tension, more efficient emulsification and improve rheological properties, and also ensures the stability of the emulsion at a high temperature.

In addition, the silicon-containing polymer has a high hydrophobic activity and adhesion to the rock. Minerals are solid rock in one form or another, contain hydroxyl groups, for example, in the composition of the crystalline bound water. These hydroxyl group rocks are actively interact with the hydroxyl groups of silicon containing compounds. When this chemical "cross-linked" cremysteries connection with rock provides a very high adhesive characteristics of the silicon-containing polymer, and the orientation of the hydrocarbon radicals inside the pore space contributes to the achievement of high hydrophobic activity.

After processing of oil - and water-saturated rocks the proposed composition of the above properties significantly increases permeability rocks for oil and reduced for Erny powder POLYSIL.

Depending on the brand of Policie, i.e., the method of modifying the surface of finely dispersed material introduced into the composition, change the properties of the proposed structure, and after the injection of a proposed composition change filtration characteristics of reservoirs for water and for oil.

Thanks to submicron particle sizes of the material used, by 2-3 orders of magnitude smaller average pore size of the collector, Policy any modifications easily penetrates into the bottomhole formation zone, changing energy surface (wettability) of the reservoir.

The proposed composition containing hydrophobic modified additive of POLYSIL-P1, largely hydrofobicity the rock surface, as the surface modified silicon compound of General formula Cl4-nSiRnwhere n=1-3; R=H, methyl, ethyl, Cl - methyl, phenyl -, followed by treatment with a compound selected from the group consisting of tetramethoxysilane, or tetraethoxysilane, or polymethylsilane. The proposed formulations can contain Policy-DF. Due to the structure of the grafted surface layer POLYSIL-DF has the properties of a solid nonionic surfactant.

Using the proposed composition of Policie Mar the layer significantly reduces the surface tension at the phase boundary water-rock-oil, increasing permeability of the fluid in the pinning him in pore volume due to the small size of its particles and due to forces of adhesion.

Add POLYSIL-DF in the composition enhances the cleaning effect of the contaminated surfaces and leads to emulsification of the fat and oil pollution, dispersion and stabilization of the particles of solid impurities (ASPO).

The proposed formulations can contain Policy-SF, which has superfeminine organopolymer properties.

Add POLYSIL-SF in the proposed structure leads to the displacement of oil from poorly drained intervals, and also causes clogging of the aquifer channels by increasing the thickness of the hydrate shells.

By increasing the concentration of the material brand Policy introduced into the composition, increases the stabilizing effect of it, which allows to obtain a stable emulsion of a higher viscosity.

The composition may additionally contain calcium chloride in the amount of 1.0-10.0 wt.%. Due to the introduction of calcium chloride increases the viscosity, the sedimentation stability of the emulsion increases the insulating effect of the composition.

The presence of calcium chloride increases the s transformation of the emulsifier in the emulsion and changes in the composition of the adsorption layer. The presence of calcium cations contributes to the behavior of metabolic reactions of formation of metal Soaps of higher carboxylic acids present in the composition of the emulsifier, which leads to a sharp decrease in interfacial tension, more efficient emulsification, growth structural viscosity of the emulsion and stabilize it at a high temperature.

The composition may contain a hydrocarbon solvent in the amount of 2.0 to 15.0 wt.%, which use low-viscosity oil, as well as stable gasoline, natural gasoline, hexane fraction (a mixture of saturated hydrocarbons-Xie Xie and above), diesel toplivo, nefras and other hydrocarbon solvents.

The introduction of oil or other uglevodorodnogo part allows you to adjust the viscosity and the stability of the emulsion composition.

The proposed composition is prepared as follows. In the estimated number of MPAS under mechanical stirring enter the estimated amount of the silicon-containing substance, then dispense small amounts estimated quantity of waste water or an aqueous solution of calcium chloride, stirred thoroughly until a homogeneous emulsion of the type water-in-oil".

The composition may contain liquid at the La different brands Policie: POLYSIL-P1 and Policy-DF dosed in NAV, Policy-SF injected into water or an aqueous solution of calcium chloride.

To determine the stability of the proposed emulsions at elevated temperatures and their rheological characteristics conducted laboratory studies have confirmed its high efficiency.

Of particular importance is the stability of the emulsion, i.e. the ability of the composition to maintain its technological properties for a longer time.

The higher the stability of the emulsion, the longer it retains homogeneity and viscosity of the composition. During storage of the emulsion in macroamylase at elevated temperature is in violation of its homogeneity with the separation of oil and water, i.e. the destruction of the emulsion. Therefore, to study the stability of emulsions in porous media at elevated temperatures were conducted such studies.

In a report prepared for filtration column upload one pore volume of the studied emulsions containing silicon-containing substance, after which the column is placed in an air heat chamber at a temperature of 80°C. Through a column with an interval of one day is pumped by three water volume and determine the stability of emulsions to reduce permeability1/K2·100%.

The research has the elevated temperature (80°C) from 1.5 to 18 days. The results are presented in table.1-5 (see stability, days. at 80°C).

Example 1. Prepare two emulsion on the proposed composition: 12.5 g Netanya H3 added under mechanical stirring 5 g of the product 119-204 and 1.0 g of Policie, then in the first emulsion in small portions metered 82.5 g of waste water, the second 82.5 g of a 10% aqueous solution of calcium chloride, mixing thoroughly to obtain a homogeneous emulsion. The prepared emulsion is filtered on filter systems to determine lower permeability. To filter column prepared from stainless steel with a length of 220 mm and an inner diameter of 32 mm is filled with a mixture containing sandstones, which are unevenly separated by layers of dense differences siltstones and clays, with field Bobrikovsky horizon Visean tier of the Samara region. Models under vacuum saturated with water, the weight method to determine the initial permeability of the cores of fresh water, which was 0,2011-0,4539 μm2(K1). Then pumped through the column one pore volume of the proposed emulsions and three pore volume of the core of fresh water. After that, determine the water permeability (K2). Reduction of permeability in % is determined by the change preceedes on the above methodology. Vysheperichislennye emulsion is stable for 7 and 12 days, respectively (see tab.1 and 2, line 7).

The results of the filtration tests are presented in table.1 and 2.

Example 2. Prepare three emulsion on the closest analogue: 12.5 g Netanya H3 of each of the emulsion added with mechanical stirring respectively 5, 10 and 15 g of liquid glass brand "Silina-30", then small portions metered estimated amount of waste water, mixing thoroughly to obtain a homogeneous emulsion. The resulting emulsion is filtered on filter systems to determine the reduction of permeability (see Example 1). The stability of the obtained emulsion is determined by the above method. Vysheperichislennye emulsion is stable for 3, 5, 6 and 5 days, respectively (see tab.1, line 10). Data on the stability of emulsions at elevated temperatures in the closest analogue is not.

Example 3. The structural viscosity of the proposed emulsions and emulsions of the prototype is measured by a rotational viscometer Prugnolo type "Polymer RPE-1M with the receptive elements of type "cylinder-cylinder and evaluation of rheological properties of torque at 25, 40, 60, 80°C.

The results of the measurements are presented ü emulsions at a temperature of from 25 to 80°C.

thermal stability of the proposed emulsions and emulsions on the closest analogue was determined by incubation of compounds in macroamylase at 80°C in a heating Cabinet for several days. After one day of exposure of the emulsions were measured viscosity them on rebeccasommer of Hepler. Viscosity on rebeccasommer of Hepler determine the time of immersion of ball (t, s) under the action of the applied load (P, g/cm2), which is calculated by the formula M=t, where K is a constant according to the formula. The stability of emulsions (TC) was estimated by the following formula:

where Vo and Vt - viscosity emulsion source (at 20°C) and after holding it at the required temperature for a certain period of time.

The higher thermal stability (TS), the higher thermal stability of the composition. The results of the study thermal stability of the emulsions after 3 days aging them at 80°C are given in table.3.

From the given data on thermal stability of the emulsions can be seen that the introduction of the silicon-containing substances dramatically increases thermal stability of structures (see tab.3).

Example 4. Prepare two emulsion on the proposed composition: 5 and 10 g of low-viscosity oil (8,5 MPa·s at 20°C and density 842 kg/m3<, Policie, then small portions metered 77,5 g and 72.5 g of waste water, thoroughly mixed components to obtain a homogeneous emulsion. The resulting emulsion is filtered on filter systems to determine the reduction of permeability (see Example 1). The stability of the obtained emulsion is determined by the above method. The emulsion is stable for 9 and 10 days, respectively (see tab.4, lines 8 and 9).

The filtering results of the proposed emulsions containing additional hydrocarbons are presented in table.4.

Example 5. Oil-driving ability of the emulsions is determined in terms of Tootmine of residual oil on the linear model for the homogeneous reservoir, representing the above-described stainless steel column. The column is filled to the above mixture. The model under vacuum saturated with water, the weight method is determined by the permeability of the columns on the water.

After that in the model under pressure is pumped oil until until exit appears clean (without water) oil, is determined by the initial oil saturation. In the filtration works use natural oil density 842 kg/m3and a dynamic viscosity of 8.5 MPa·s at 20°C. the Initial displacement conduct water new volume of the test emulsion and three pore volumes of water, determine the growth rate and total fertility rate of oil displacement.

The filter results emulsions according to the definition of oil-driving ability of the compositions shown in table.5.

The results showed that the optimal concentration to obtain stable emulsions are: NAV - 1.0 to 15.0 wt.%, silicon-containing substance is 0.5 to 18.0 wt.%, water - the rest.

When the content of the components of the emulsion: NAV less than 1.0 wt.%, silicon-containing substance is less than 0.5 wt.% form an unstable emulsion, so the concentration of the components taken for the lower limit of concentration.

When the content of the components of the emulsion: NAV more than 15 wt.%, silicon-containing substance more than 18 wt.%, does not lead to a significant increase in the stability of emulsions at elevated temperature, to a substantial increase of decrease the permeability and increase the coefficient of the displacement, so the use of an emulsion containing components above these concentrations is inappropriate.

The composition may contain calcium chloride in the amount of 1.0-10.0 wt.%, the hydrocarbon solvent in the amount of 2.0 to 15.0 wt.%, and also modified superfine material Policy above marks in number is its substance and water, as well as the other above-mentioned components will allow us to obtain highly viscous and stable composition, pumping which will reduce the permeability of water-saturated layers, and due to the high oil-driving properties of the composition and increase the hydrophobization of the surface of the rock will increase the relative permeability of the formation to hydrocarbon phase is compared to water.

Technology is the application of the proposed structure is simple and is injected into a reservoir to reduce the injectivity of wells by 30-50%, the displacement of the composition from the wellbore into the reservoir with water or oil, the extract in the reservoir within 12-24 hours and putting the well into operation for oil wells or injection water for injection wells.

Claims

1. The composition for treatment of bottom-hole formation zone, including oil-soluble surface-active substance NAV, silicon-containing substance and water, characterized in that as the silicon-containing substances it contains silicone substance or soluble or colloidal sodium silicate and advanced Policy in the following ratio, wt.%:

NAV 1,0 - 15,0

Silicone substance or

3. Composition under item 1, characterized in that it further comprises a hydrocarbon solvent in the amount of 2.0 to 15.0 wt.%.

 

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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.

SUBSTANCE: method includes drilling product and force wells, forcing gas and water through force wells into separate zones of productive bed and extraction of hydrocarbons from product wells, forming separate gas, water and hydrocarbon saturated areas with major contents of respectively gas, collected therein for later use, water and hydrocarbons, periodical pumping of collected gas from formed gas saturated zones to water saturated zones, periodical pumping of water to gas saturated zones is performed. It is possible to pump collected gas to water saturated zones in form of gas-water mixture. It is possible to pump in passing gas of current deposit. It is possible to pump hydrocarbon or non-hydrocarbon gas from other sources. It is possible to pump water with admixture of specifically selected chemical reagents or compositions thereof. When gas content in water saturated zones reaches from 0.1 to 28% from water content in water saturated zones it is reasonable to generate resilient waves with frequency within range from 0.0001 to 45 KHz and amplitude within range from 0.02 to 2.8 MPa. It is reasonable to pump gas and water to separate areas of productive bed with concurrent generation of resilient waves in there with frequency within range from 0.0001 to 45 KHz and amplitude within limits from 0.02 to 2.8 MPa.

EFFECT: higher efficiency.

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 60-90°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

FIELD: mining industry and alternative fuels.

SUBSTANCE: coal is affected by methanogenic consortium of microorganisms with culture medium utilizing continuous pumping of culture medium through wells and tank wherein methanogenic consortium of microorganisms with culture medium is placed. Tank is installed on the surface above wells and pumping of culture medium from the bottom of tank through methanogenic consortium of microorganisms. Process produces biogas and coal-water fuel.

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

1 dwg, 2 tbl

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