METHOD FOR LEVELING THE INJECTIVITY PROFILE OF AN INJECTION WELL

Abstract

The disclosure relates to the oil and gas production industry, and more particularly to technologies for redistributing filter flows in the bottom-hole formation zone of an injection well. A method involves pumping into the bottom-hole formation zone a blocking agent in the form of an emulsion system containing nanoparticles of silicon dioxide and being comprised of: 5-12 vol % diesel fuel or processed oil from an oil processing and pumping station, 2-3 vol % emulsifier, 0.25-1.0 vol % colloidal nanoparticles of silicon dioxide, with the remainder being an aqueous solution of calcium chloride or potassium chloride. The emulsifier is in the form of a composition comprising: 40-42 vol % esters of higher unsaturated fatty acids and resin acids, 0.7-1 vol % amine-N-oxide, 0.5-1 vol % high-molecular-weight organic thermostabilizer, with the remainder being diesel fuel.

Claims

1. A method for leveling the injectivity profile of an injection well, comprising injecting into a bottom hole formation zone a blocking agent in the form of an emulsion system containing nanoparticles of silicon dioxide, the emulsion system comprising (vol %): diesel fuel—5-12, an emulsifier—2-3, colloidal nanoparticles of silicon dioxide—0.25-1.0, an aqueous solution of calcium chloride or potassium chloride—the rest, wherein: the emulsifier is in the form of a composition comprising (vol. %): esters of higher unsaturated fatty acids and resin acids—40-42, amine oxide—0.7-1, a high-molecular-weight organic thermostabilizer—0.5-1, diesel fuel—the rest, the colloidal nanoparticles of silicon dioxide are in the form of a composition comprising (vol %.): silicon dioxide—30-32 in propylene glycol monomethyl ether—67-68, water—the rest, or silicon dioxide—29-31 in isopropanol—67-69 and methyl alcohol—the rest, or silicon dioxide—29-31 in ethylene glycol—the rest.

2. The method according to claim 1, wherein the esters of higher unsaturated fatty acids are selected from esters of linoleic or oleic acids, and the high-molecular-weight organic thermostabilizer is selected from suspension of lime in diesel fuel or suspension of bentonite in diesel fuel.

3. A blocking agent for injecting into a bottom hole formation zone in a form of an emulsion system containing nanoparticles of silicon dioxide, the emulsion system comprising (vol %): diesel fuel—5-12, an emulsifier—2-3, colloidal nanoparticles of silicon dioxide—0.25-1.0, an aqueous solution of calcium chloride or potassium chloride—the rest, wherein: the emulsifier is in the form of a composition comprising (vol. %): esters of higher unsaturated fatty acids and resin acids—40-42, amine oxide—0.7-1, a high-molecular-weight organic thermostabilizer—0.5-1, diesel fuel—the rest, the colloidal nanoparticles of silicon dioxide are in the form of a composition comprising (vol %.): silicon dioxide—30-32 in propylene glycol monomethyl ether—67-68, water—the rest, or silicon dioxide—29-31 in isopropanol—67-69 and methyl alcohol—the rest, or silicon dioxide—29-31 in ethylene glycol—the rest.

4. The blocking agent according to claim 4, wherein esters of higher unsaturated fatty acids are selected from esters of linoleic or oleic acids, and the high-molecular-weight organic thermostabilizer is selected from suspension of lime in diesel fuel or suspension of bentonite in diesel fuel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The disclosure is illustrated by the following drawings.

[0020] FIG. 1 shows a table listing the equipment for the preparation and injection of ESN into an injection well.

[0021] FIG. 2 shows a table illustrating the results of measurements of the ESN density (the density of the water component is 1200 kg/m.sup.3).

[0022] FIG. 3 shows a table illustrating the measurement results of the ESN thermal stability at 140° C.

[0023] FIG. 4 is a table illustrating the measurement results of the ESN dynamic viscosity.

[0024] FIG. 5 shows a table illustrating dependence of the ESN effective viscosity on test time (dynamic stability) at the temperature of 20.0° C. and the shear rate of 450.0 s.sup.−1.

DETAILED DESCRIPTION

[0025] The method is based on the directional impact of the ESN on most permeable intervals of the BFZ of an injection well. The method provides redistribution of filtration flows in the BFZ and the involvement of less permeable stagnant zones of the reservoir into filtration processes. The unique physical properties of the ESN enable to effectively apply the method in reservoirs with abnormal temperatures, as well as to adjust physical properties of a reversible blocking agent, depending on reservoir conditions and well operation modes by changing a volume ratio of the constituent phases.

[0026] The main unique physical properties of the ESN are reversibility of the blocking effect, high heat (140° C.) and filtration stability, adjustment of rock surface wettability, self-adjusting viscosity in the course of injection and during filtration in reservoir conditions.

[0027] Shear gradient and dynamic viscosity values adjustable in wide ranges, along with the stability and surface activity of the ESN, ensure reliable blocking of most permeable zones and provide redistribution of filtration flows in the BFZ.

[0028] When the ESN is filtered in rock porous materials, the system effective viscosity depends on volumetric water content of a filtration channel and a filtration rate, increasing with an increase in the volumetric water content and a decrease in the filtration rate. This explains the self-adjustment of viscosity properties, velocity and direction of the ESN filtration into reservoir depth.

Well Selection and Requirements to a Target

[0029] Injection wells are selected for implementing the method.

[0030] The basic requirements to wells are as follows: [0031] a perforation interval and a well sump must be free from massive sediments, deposits and foreign objects that prevent liquids from filtering into the perforated intervals; [0032] the casing string must be leaktight; [0033] reservoir temperature is not limited, but must be determined before starting the works; [0034] the well water injectivity must be at least 150 m.sup.3/day at an injection pressure at the wellhead not more than 120 atm; if injectivity is insufficient, the BFZ is treated according to one of the classical methods for increasing well injectivity.

[0035] An ESN volume to be injected is calculated according to the known method provided in the work by Orkney K. G., Kuchinsky P. K. “Calculations in technology and techniques of oil production”, Gostoptekhizdat, 1959. To calculate a volume of the ESN required to fill a rock void space at a certain radius from the well, the following formula may be used:

V=π.Math.(R.sub.out.sup.2−r.sub.w.sup.2).Math.h.Math.m.Math.(1−SWL−SOWCR) [0036] where: [0037] V—calculated volume, m.sup.3; [0038] R.sub.out—outer radius of the emulsion system fringe, m; [0039] r.sub.w—well radius, m; [0040] h—reservoir thickness, m; [0041] m—reservoir porosity factor, unit fraction; [0042] SWL—connate water saturation, unit fraction; [0043] SOWCR—residual oil saturation, unit fraction.

[0044] The provided method takes into account geometrical dimensions of the target area and porosity and permeability characteristics of the formation. The use of connate water saturation and residual oil saturation in the calculation enables to take into account the volume of the pore space that is not involved in the filtration process.

Technological Process of ESN Preparation

[0045] The ESN is prepared at an emulsion system preparation unit (ESPU) that comprises a process tank with a blade mixer installed therein and having a rotation speed of at least 90 rpm, and an external centrifugal pump for circulation of the ESN components. The necessary process equipment for preparation and injection of the ESN into production wells is shown in FIG. 1.

[0046] The process of preparing ESN with the use of an ESPU is a step-by-step process and includes the following steps: [0047] feeding a calculated volume of diesel fuel or processed oil from an oil processing and pumping station (5-12 vol %) into the ESPU process tank; [0048] starting the blade mixer and the centrifugal pump for circulation; [0049] feeding a calculated volume of the emulsifier into the ESPU process tank (2-3 vol %); [0050] feeding a calculated volume of colloidal nanoparticles of silicon dioxide (0.25-1.0 vol %) into the ESPU process tank; [0051] feeding a calculated volume of an aqueous solution of calcium chloride or potassium chloride (the rest) into the ESPU process tank.

[0052] The components are introduced into the hydrocarbon base through an ejector with the use of a vacuum hose. The loading speed of the components is limited by the suction capacity of the ejector.

[0053] Technological tanks should be equipped with blade mixers providing constant and uniform distribution of reactants throughout the entire volume. To provide and maintain the required stability properties of the systems, it is recommended using reversible blade mixers.

[0054] The quality and stability of the properties of the prepared ESN depend on coverage of the entire volume of the ESPU process tank with the mixing, cleanliness of process tanks used, feeding rate of the components and dispersion time.

[0055] Quality control of ESN preparation is carried out by testing the sedimentation stability. The test is considered positive if, when a 200 ml ESN sample is kept at room temperature for 2 hours, not more than 2% of the ESN water component volume are separated.

[0056] The quantity and types of special machinery and equipment for performing well operations are shown in FIG. 1. The calculation was made on the condition that the ESN was prepared with the use of the ESPU. The presented list of special machinery and equipment is a basic one and may include additional items, depending on work conditions, a location of a mixing unit, process parameters and specific features of a well structure.

Preparatory Works on a Well

[0057] Before start of the works on injection of the ESN into a well, the following preparatory works are carried out on a well: [0058] the well is stopped and discharged; serviceability of the stop valves at the wellhead equipment is checked; [0059] circulation in the well is checked; and a decision is taken on a variant of injecting process liquids; [0060] a value of the current formation pressure is determined; [0061] the equipment for injecting the ESN is arranged according to an approved layout; [0062] the equipment piping is provided; and the injection line is tested for a pressure value 1.5 times higher than the expected operating pressure, while observing applicable safety measures; [0063] the injection line is provided with a non-return valve.

Injection Process

[0064] To maintain the continuity of the injection process, there must be a sufficient number of tank trucks at the well pad with the required volume of liquids for the operation.

[0065] The method is implemented by continuously injecting the estimated ESN volume into the injection well, while continuously monitoring the main parameters of the injection process. The ESN comprises diesel fuel or processed oil from an oil processing and pumping station, an emulsifier, colloidal nanoparticles of silicon dioxide, an aqueous solution of calcium chloride or potassium chloride.

[0066] The ESN may comprise (vol %): diesel fuel or processed oil from an oil processing and pumping station—5-12, an emulsifier—2-3, colloidal nanoparticles of silicon dioxide—0.25-1.0, an aqueous solution of calcium chloride or potassium chloride—the rest. The emulsifier may comprise (vol %): esters of higher unsaturated fatty acids and resin acids—40-42, amine oxide—0.7-1, high-molecular-weight organic thermostabilizer—0.5-1, diesel fuel—the rest. Colloidal nanoparticles of silicon dioxide may comprise (vol %): [0067] silicon dioxide—30-32 in propylene glycol monomethyl ether—67-68, water—the rest, or [0068] silicon dioxide—29-31 in isopropanol—67-69 and methyl alcohol—the rest, or [0069] silicon dioxide—29-31 in ethylene glycol—the rest.

[0070] The main physical parameters of systems and aqueous solutions of salts are adjusted based on the calculated phase volumes of the components and their density.

[0071] One of the two options for injecting process liquids into the well can be used: direct or reverse. Traditionally, the process liquids are injected into the well tubing space (direct injection). However the preferred option for injecting the ESN is reverse injection through the tubular annular space.

[0072] The process liquids should be injected continuously, at a rate that prevents a decrease in the density of the process liquids.

[0073] The injection rate of the process liquids is determined by the magnitude of the reservoir pressure and should be maximum, exceeding the well productivity, provided that the well pressure does not exceed the maximum permissible value (according to the pressure test of the casing string).

[0074] A required density of the process liquids is determined on the basis of a calculation, while proceeding from the condition that a column of the process liquids creates a pressure that exceeds a current formation pressure by the safety factor.

[0075] An amount of dry potassium chloride or calcium chloride required to prepare the required volume of an aqueous solution of a certain density is calculated with the use of the following formula:

[00001]$M_p=\frac{Y_p*-Y_B)*V_p*10}{Y_p-Y_B},$

where: [0076] M.sub.p—reactant amount, kg; [0077] Y.sub.p—reactant specific density, g/cm.sup.3; [0078] Y—specific density of killing process liquids, g/cm.sup.3; [0079] Y.sub.B—specific density of process water used for preparing process liquids, g/cm.sup.3; [0080] V.sub.p—required volume of aqueous solution, m.sup.3.

[0081] As final activities on the well, the following work must be performed: [0082] 1. Check that all valves on the well control equipment are closed. [0083] 2. Discharge the injection line, making sure that there is no excess pressure. [0084] 3. Dismantle the injection line avoiding spills of the process liquids. [0085] 4. Release the pressure to the atmospheric one in the pipeline from the well to the group metering unit.

Laboratory Studies of the ESN Physical Properties

[0086] To study the ESN physical properties, samples with different volumetric content of the components were prepared.

[0087] During the experiments, the following system parameters were determined: [0088] density; [0089] heat stability; [0090] dynamic viscosity; [0091] dynamic stability.

[0092] After the samples of the systems were prepared, they were kept for at least 2 hours at room temperature before starting the experiments.

Measuring ESN Density

[0093] Densities of the ESN samples were measured by the picnometric method (water component density was 1200 kg/m.sup.3). The results are shown in FIG. 2.

Measuring ESN Thermal Stability

[0094] Thermal stability was measured by keeping the ESN samples in graduated hermetically sealed cylinders in a heating cabinet for 8 hours; the temperature regime was set at 140° C. The test was considered positive if, after 8 hours of thermostating, not more than 2 vol. % of water were separated in the ESN from the total volume of the aqueous phase. In the result of the experiments, it was determined that all the samples were stable. The results are shown in FIG. 3.

Evaluating ESN Rheological Properties

[0095] The measurements of dynamic viscosity and dynamic stability of the ESN samples are shown in FIGS. 4 and 5. The measurements were obtained at the temperature of 20° C. (the temperature measurement error was ±0° C.) with the use of a REOTEST RV 2.1 rotational viscometer.

[0096] The following parameters were determined: [0097] effective (apparent) viscosity (mPa.$) during direct and reverse measurements; [0098] shear stress (Pa) during direct and reverse measurements; [0099] dynamic stability.

[0100] Based on the results of the set of laboratory studies of the ESN physical properties, the basic technological properties of the developed systems were determined, which confirmed their high thermal stability and controlled rheology.

[0101] Examples of implementation of the method are given below.

Example 1

[0102] The following preparatory works were carried out on the well: the well was stopped, discharged, operability of the stop valves on the wellhead equipment was checked; a value of the current formation pressure was determined; the equipment was arranged according to the approved layout; piping of the equipment was carried out, and the injection line was tested for a pressure exceeding the expected operating pressure by 1.5 times; the injection line was provided with a non-return valve.

[0103] Upon completion of the preparatory work, a process of injecting the ESN into an injection well was started.

[0104] The ESN of the following composition, vol %, was injected in the volume of 426 m.sup.3: diesel fuel—5, an emulsifier—2, colloidal nanoparticles of silicon dioxide—1.0, an aqueous solution of calcium chloride having the density of 1189 kg/m.sup.3 —92.0. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (linoleic) and resin acids (dextropimaric)—40, amine oxide—0.7, a high-molecular-weight organic thermostabilizer (suspension of lime in diesel fuel)—0.5, diesel fuel—58.8. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—30.0 in propylene glycol monomethyl ether—67.0, water—3.0.

[0105] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 2

[0106] In this and the following examples, the preparatory works were carried out in accordance with the procedure described in Example 1.

[0107] The ESN of the following composition, vol %, was injected in the volume of 502 m.sup.3: diesel fuel—7, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—0.9, an aqueous solution of calcium chloride having the density of 1193 kg/m.sup.3 —89.6. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (linoleic) and resin acids (dextropimaric)—41, amine oxide—0.8, a high-molecular-weight organic thermostabilizer (suspension of lime in diesel fuel)—0.7, diesel fuel—57.5. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—32.0 in propylene glycol monomethyl ether—67.0, water—1.0.

[0108] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 3

[0109] The ESN of the following composition, vol %, was injected in the volume of 294 m.sup.3: diesel fuel—10, an emulsifier—3, colloidal nanoparticles of silicon dioxide—0.6, an aqueous solution of calcium chloride having the density of 1187 kg/m.sup.3 —86.4. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (linoleic) and resin acids (isodextropimaric)—42, amine oxide—1.0, a high-molecular-weight organic thermostabilizer (suspension of lime in diesel fuel)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—32.0 in propylene glycol monomethyl ether—67.0, water—1.0.

[0110] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 4

[0111] The ESN of the following composition, vol %, was injected in the volume of 415 m.sup.3: diesel fuel—12, an emulsifier—3, colloidal nanoparticles of silicon dioxide—0.5, an aqueous solution of calcium chloride having the density of 1205 kg/m.sup.3 —84.5. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (linoleic) and resin acids (levopimaric)—42, amine oxide—1.0, a high-molecular-weight organic thermal stabilizer (suspension of lime in diesel fuel)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in propylene glycol monomethyl ether—68.0, water—1.0.

[0112] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 5

[0113] The ESN of the following composition, vol %, was injected in the volume of 433 m.sup.3: diesel fuel—12, an emulsifier—3, colloidal nanoparticles of silicon dioxide—0.4, an aqueous solution of calcium chloride having the density of 1210 kg/m.sup.3 —84.6. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (linoleic) and resin acids (palustric)—42, amine oxide—0.8, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.9, diesel fuel—56.3. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—29.0 in isopropanol—69.0 and methyl alcohol—2.0.

[0114] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 6

[0115] The ESN of the following composition, vol %, was injected in the volume of 388 m.sup.3: diesel fuel—11, an emulsifier—2.6, colloidal nanoparticles of silicon dioxide—0.25, an aqueous solution of calcium chloride having the density of 1215 kg/m.sup.3 —86.15. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (neoabietic) —40, amine oxide—0.7, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.5, diesel fuel—58.8. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—30.5 in isopropanol—67.5 and methyl alcohol—2.0.

[0116] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 7

[0117] The ESN of the following composition, vol %, was injected in the volume of 219 m.sup.3: diesel fuel—9, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—1.0, an aqueous solution of calcium chloride having the density of 1205 kg/m.sup.3 —87.5. The emulsifier comprised,% vol: esters of higher unsaturated fatty acids (oleic) and resin acids (neoabietic)—41, amine oxide—1.0, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—57.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in isopropanol—68 and methyl alcohol—1.0.

[0118] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 8

[0119] The ESN of the following composition, vol %, was injected in the volume of 375 m.sup.3: diesel fuel—7, an emulsifier—2.0, colloidal nanoparticles of silicon dioxide—0.85, an aqueous solution of calcium chloride having the density of 1140 kg/m.sup.3 —90.15. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (abietic)—40.5, amine oxide—0.8, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.6, diesel fuel—58.1. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in ethylene glycol—69.0.

[0120] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 9

[0121] The ESN of the following composition, vol %, was injected in the volume of 545 m.sup.3: processed oil from an oil processing and pumping station—7, an emulsifier—2.0, colloidal nanoparticles of silicon dioxide—0.85, an aqueous solution of potassium chloride having the density of 1153 kg/m.sup.3 —90.15. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (dehydroabietic)—40.5, amine oxide—0.8, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.6, diesel fuel—58.1. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—29.0 in isopropanol—69 and methyl alcohol—2.0.

[0122] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 10

[0123] The ESN of the following composition, vol %, was injected in the volume of 504 m.sup.3: processed oil from an oil processing and pumping station—9, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—0.5, an aqueous solution of potassium chloride having the density of 1150 kg/m.sup.3 —88.0. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (dehydroabietic)—42.0, amine oxide—0.7, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—56.3. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in isopropanol—67 and methyl alcohol—2.0.

[0124] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 11

[0125] The ESN of the following composition, vol %, was injected in the volume of 476 m.sup.3: processed oil from an oil processing and pumping station—10, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.0, an aqueous solution of potassium chloride having the density of 1147 kg/m.sup.3 —86.0. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (dehydroabietic)—40.0, amine oxide—0.7, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—58.3. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—29.0 in ethylene glycol—71.0.

[0126] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 12

[0127] The ESN of the following composition, vol %, was injected in the volume of 352 m.sup.3: processed oil from an oil processing and pumping station—12, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—0.9, an aqueous solution of potassium chloride having the density of 1170 kg/m.sup.3 —84.1. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (tetrahydroabietic)—41.0, amine oxide—0.9, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.8, diesel fuel—57.3. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—30.0 in ethylene glycol—70.0.

[0128] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 13

[0129] The ESN of the following composition, vol %, was injected in the volume of 276 m.sup.3: processed oil from an oil processing and pumping station—10, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—0.25, an aqueous solution of potassium chloride having the density of 1200 kg/m.sup.3 —86.75. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (tetrahydroabietic)—41.0, amine oxide—0.9, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.8, diesel fuel—57.3. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in ethylene glycol—69.0.

[0130] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 14

[0131] The ESN of the following composition, vol %, was injected in the volume of 275 m.sup.3: processed oil from an oil processing and pumping station—5.0, an emulsifier—2.0, colloidal nanoparticles of silicon dioxide—0.6, an aqueous solution of potassium chloride having the density of 1200 kg/m.sup.3 —92.4. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (abietic)—42.0, amine oxide—1.0, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in ethylene glycol—69.0.

[0132] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 15

[0133] The ESN of the following composition, vol %, was injected in the volume of 420 m.sup.3: processed oil from an oil processing and pumping station—6, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—0.6, an aqueous solution of potassium chloride having the density of 1205 kg/m.sup.3 —90.4. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (levopimaric)—42.0, amine oxide—1.0, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in ethylene glycol—69.0.

[0134] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 16

[0135] The ESN of the following composition, vol %, was injected in the volume of 350 m.sup.3: processed oil from an oil processing and pumping station—5, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.0, an aqueous solution of potassium chloride having the density of 1190 kg/m.sup.3 —91.0. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (palustric)—42.0, amine oxide—1.0, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—31.0 in propylene glycol monomethyl ether—67.0, water—2.0.

[0136] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 17

[0137] The ESN of the following composition, vol %, was injected in the volume of 388 m.sup.3: processed oil from an oil processed and pumping station—12, an emulsifier—2.0, colloidal nanoparticles of silicon dioxide—0.25, an aqueous solution of potassium chloride having the density of 1195 kg/m.sup.3 —85.75. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (palustric)—42.0, amine oxide—1.0, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—32.0 in propylene glycol monomethyl ether—67.0, water—1.0.

[0138] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 18

[0139] The ESN of the following composition, vol %, was injected in the volume of 276 m.sup.3: processed oil from an oil processed and pumping station—9.0, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—0.7, an aqueous solution of potassium chloride having the density of 1205 kg/m.sup.3 —87.8. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (dextropimaric)—41.0, amine oxide—0.7, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.5, diesel fuel—57.8. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—32.0 in propylene glycol monomethyl ether—67.0, water—1.0.

[0140] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 19

[0141] The ESN of the following composition, vol %, was injected in the volume of 905 m.sup.3: processed oil from an oil processing and pumping station—5.0, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.0, an aqueous solution of potassium chloride having the density of 1192 kg/m.sup.3 —91.0. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (levopimaric)—41.0, amine oxide—0.7, a high-molecular-weight organic thermostabilizer (suspension of bentonite in diesel fuel)—0.5, diesel fuel—57.8. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—30.0 in isopropanol—68 and methyl alcohol—2.0.

[0142] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

Example 20

[0143] The ESN of the following composition, vol %, was injected in the volume of 290 m.sup.3: processed oil from an oil processing and pumping station—8.0, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—0.7, an aqueous solution of potassium chloride having the density of 1203 kg/m.sup.3 —88.3. The emulsifier comprised, vol %: esters of higher unsaturated fatty acids (oleic) and resin acids (levopimaric)—41.5, amine oxide—0.9, a high-molecular-weight organic thermostabilizer (suspension of lime in diesel fuel)—1.0, diesel fuel—56.6. The colloidal nanoparticles of silicon dioxide comprised, vol %: silicon dioxide—30.5 in isopropanol—67.5 and methyl alcohol—2.0.

[0144] According to the results of the well treatment, redistribution of filtration flows along the injectivity profile was achieved.

[0145] Thus, the present disclosure, and the various embodiments described herein, provides for redistribution of filtration flows at the BFZ of injection wells, increasing the formation coverage of treatment. At the same time, owing to the present disclosure, and the various embodiments described herein, the following is achieved: [0146] technological efficiency of well operation is increased, [0147] the composition applicability in oil-and-gas reservoirs is expanded due to increased mechanical and thermal stability of the emulsion system, [0148] implementation of the method in the conditions of an oil and gas production field is simplified due to a decrease in the composition components, due to eliminating the necessity of using a buffer pack for reducing the risk of gelation of a water absorbing polymer in the course of injecting the composition into a well, and due to reducing sensitivity of the agent components to salinity and composition of process water and formation waters, [0149] harmful effect on the environment is reduced due to reversibility of the blocking effect of the proposed composition.