METHOD FOR PREVENTING STRATAL WATER FROM BREAKING THROUGH INTO BOTTOM HOLES OF WELLS

Abstract

The present disclosure relates to the gas production industry. A shielding formation member, for which use is made of an emulsion-suspension system with colloidal nano-particles of silicon dioxide is injected into the bottom region of a formation, the system comprising (% by vol.): 5-12 of diesel fuel or processed oil from an oil processing and pumping station, 2-3 of emulsifier, and 1.0-1.5 of colloidal nano-particles of silicon dioxide, with the remainder being an aqueous solution of calcium chloride or potassium chloride. The emulsifier used is a composition comprising (% by vol.): 40-42 of esters of higher unsaturated fatty acids and resin acids, 0.7-1 of amine-N-oxide, 0.5-1 of high-molecular-weight organic heat stabilizer, with the remainder being diesel FUEL.

Claims

1. A method for preventing stratal water from breaking through into bottom holes of gas, gas-condensate, or gas-hydrate wells, comprising: performing an injection of a shielding agent into a bottomhole formation zone, for which an emulsion-suspension system (ESS) containing colloidal nanoparticles of silicon dioxide is used, the system comprising, % by vol.: diesel fuel or processed oil from an oil processing and pumping station—5-12, emulsifier—2-3, colloidal nanoparticles of silicon dioxide—1.0-1.5, aqueous solution of calcium chloride or potassium chloride—the rest, wherein a composition is used as said emulsifier that comprises, % by 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, and wherein a composition is used as said colloidal nanoparticles of silicon dioxide that comprises, % by vol.: silicon dioxide—31-32.5 in propylene glycol monomethyl ether—67-68, water—the rest, or silicon dioxide—30-31 in isopropanol—67-68 and methyl alcohol—the rest, or silicon dioxide—29-31 in ethylene glycol—the rest.

2. The method according to claim 1, 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 lime-in-diesel fuel suspension or bentonite-in-diesel fuel suspension.

3. An emulsion-suspension system (ESS) for preventing stratal water from breaking through into bottom holes of gas, gas-condensate, or gas-hydrate wells, containing colloidal nanoparticles of silicon dioxide is used, the system comprising, % by vol.: diesel fuel—5-12, emulsifier—2-3, colloidal nanoparticles of silicon dioxide—1.0-1.5, aqueous solution of calcium chloride or potassium chloride—the rest, wherein a composition is used as said emulsifier that comprises, % by 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, and wherein a composition is used as said colloidal nanoparticles of silicon dioxide that comprises, % by vol.: silicon dioxide—31-32.5 in propylene glycol monomethyl ether—67-68, water—the rest, or silicon dioxide—30-31 in isopropanol—67-68 and methyl alcohol—the rest, or silicon dioxide—29-31 in ethylene glycol—the rest.

4. The emulsion-suspension system according to claim 3, 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 lime-in-diesel fuel suspension or bentonite-in-diesel fuel suspension.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0031] The disclosure is illustrated with the following graphic materials.

[0032] FIG. 1 shows a table describing tools and equipment for preparing and pumping the ESS into a producing well.

[0033] FIG. 2 shows a table illustrating results of measuring a density of ESS (density of the water component is 1200 kg/m.sup.3).

[0034] FIG. 3 shows a table illustrating results of measuring a thermal stability of ESS at 140° C.

[0035] FIG. 4 shows a table illustrating results of measuring a dynamic viscosity of ESS.

[0036] FIG. 5 shows a table illustrating dependence of an effective viscosity of ESS on test duration (dynamic stability) at the temperature of 20.0° C. and shear velocity of 450.0 s.sup.−1.

DETAILED DESCRIPTION

[0037] The method is based on placing a calculated ESS volume radially at the interface of a producing formation and a water-bearing stratum, which enables to create a shield impermeable for stratal water filtering into a near-wellbore zone of the productive formation. The unique physical properties of the ESS enable to apply the method efficiently in formations with anomalous temperatures and, at the same time, adjust the blocking properties of the shielding agent, depending on formation conditions and well operation conditions, by changing the components volumetric ratio.

[0038] The main unique physical properties of ESS are: high thermal (140° C.) stability and filtration stability, capability of adjusting rock surface wettability, self-regulated viscosity during the injection process and filtration into formation.

[0039] Shear gradient values and dynamic viscosity can be regulated within wide range alongside with the ESS stability and surface activity to ensure reliable blocking of water-bearing zones and facilitate hydrocarbon flow into a well. As the result of target injection of an ESS calculated volume, a radial shield is formed at the interface of a water-bearing stratum and a producing formation, its dimensions depend on density of producing well network and well operating conditions.

[0040] When the ESS is filtered in a rock porous medium, the system effective viscosity depends on volumetric water content and filtration rate, and increases with growth in volumetric water content and reduction in filtration rate. This fact can explain self-regulation of viscosity properties, rate and direction of ESS filtration deep into a formation.

[0041] Well selection and requirements to a targeted object

[0042] The following wells may be selected for implementation of the method: [0043] gas; [0044] gas-condensate; [0045] gas-hydrate.

[0046] The following principal requirements are applied to the above wells: [0047] a perforated zone and a well sump should be free from massive sediments, deposits and foreign objects hampering liquid filtration into perforated zones; [0048] a casing string should be leak-proof; [0049] a formation temperature is not limited, but should be determined before the work is started; [0050] water intake capacity of a well should be at least 150 m.sup.3/day at an intake wellhead pressure of not more than 120 atm, if said intake capacity is insufficient, the FBZ is treated by one of standard methods for increasing well intake capacity.

[0051] A volume of the ESS for injection is calculated according to the well-known method presented in the work by Orkin K. G. and Kuchinsky P. K. “Calculations in technology and process of oil production”, Gostoptekhizdat, 1959. In order to calculate a volume of the ESS required for filling a rock cavity space in a certain radius from a 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)

[0052] where:

[0053] V—calculated volume, m.sup.3;

[0054] R.sub.out—external radius of an emulsion system fringe, m;

[0055] r.sub.w—well radius, m;

[0056] h—formation thickness, m;

[0057] m—reservoir porosity factor, unit fractions;

[0058] SWL—connate water saturation, unit fractions;

[0059] SOWCR—residual gas saturation, unit fractions

[0060] This method takes into account geometrical dimensions of an area of impact and reservoir properties. The use of connate water saturation and residual gas saturation in calculations enables to take into account a volume of porous space not involved in the filtration process.

[0061] Procedure of ESS Preparation

[0062] The ESS can be prepared in an emulsion system preparation unit (ESPU) that consists of a process tank with a blade mixer arranged therein and having a rotation speed not less than 90 rpm and an external centrifugal pump for circulating the ESS components. The process equipment required for preparing and injecting the ESS into producing wells is shown in FIG. 1.

[0063] The ESS preparation procedure with the use of the ESPU is staged and comprises the following steps: [0064] adding a calculated volume (5-12% by vol.) of diesel fuel or processed oil from an oil processing and pumping station into the ESPU process tank; [0065] starting the blade mixer and the centrifugal pump for circulation; [0066] adding a calculated volume of an emulsifier (2-3% by vol.) into the ESPU process tank; [0067] adding a calculated volume (1.0-1.5% by vol.) of colloidal nanoparticles silicon dioxide into the ESPU process tank; [0068] adding a calculated volume (the rest) of an aqueous solution of calcium chloride or potassium chloride into the ESPU process tank.

[0069] The components are introduced into the hydrocarbon base by means of a jet pump with the use of a vacuum hose. The component adding rate is limited by the jet pump intake capacity.

[0070] The process tank should be equipped with blade mixer ensuring constant and uniform distribution of the reactants over the whole volume. In order to provide and maintain the required stability properties of the system, the use of blade mixer with reversible rotation is recommended.

[0071] Preparation quality and stability properties of the system depend on full coverage of the ESPU process tank volume with mixing, cleanness of the process tanks, a component introduction velocity and a period of dispersion. The use of a tank with “skewed” corners (a shape close to cylindrical one) is recommended.

[0072] The ESS preparation quality control is conducted by checking sedimentation stability of the system. The test is considered as positive, if, after holding a 200 mL sample of the ESS at room temperature for 2 hours, not more than 2% of the ESS water component volume are separated.

[0073] A number and types of special tools and equipment for conducting works at a well are shown in FIG. 1. These are calculated on the condition that an ESS is prepared with the use of an ESPU. The presented list of the special tools and equipment is a basic one and may include additional items, depending on conditions of conducting the works, a location of the solution mixing plant, process parameters and structural features of a well.

[0074] Preparatory works at a well

[0075] Before starting the works on injecting the ESS into a well, the following preparatory works are performed on the well: [0076] the well is shut off and depressurized, operability of the stop valves on the wellhead equipment is checked; [0077] circulation in the well is checked, and a decision on a process fluid injection variant is taken; [0078] a current value of the formation pressure is determined; [0079] the equipment and tools for ESS injection are arranged in accordance with an approved layout; [0080] the equipment connections are made, and the injection line is tested for a pressure 1.5 times greater than an expected operating pressure, while observing safety requirements; [0081] the injection line is provided with a check valve.

[0082] Injection Procedure

[0083] In order to maintain continuous injection, a sufficient number of tank trucks carrying required volumes of fluids for conducting the operation should be on the well pad.

[0084] The method is carried out by continuously injecting the ESS calculated volume into a producing well, while continuously checking the principal injection parameters. The ESS 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.

[0085] The ESS may comprise (% by vol.): diesel fuel or processed oil from an oil processing and pumping station—5-12, an emulsifier—2-3, colloidal nanoparticles of silicon dioxide—1.0-1.5, an aqueous solution of calcium chloride or potassium chloride—the rest. The emulsifier may comprise (% by vol.): esters of higher unsaturated fatty acids and resin acids—40-42, amine oxide—0.7-1, a high-molecular organic thermostabilizer—0.5-1, diesel fuel—the rest. Colloidal nanoparticles of silicon dioxide may comprise (% by vol.): [0086] silicon dioxide—31-32.5 in propylene glycol monomethyl ether—67-68, water—the rest, or [0087] silicon dioxide—30-31 in isopropanol—67-68 and methyl alcohol—the rest, [0088] or [0089] silicon dioxide—29-31 in ethylene glycol—the rest.

[0090] The principal physical parameters of systems and aqueous salt solutions are adjusted on the basis of volumes and densities of calculated components.

[0091] Two variants of process fluid injection into a well may be applied: direct or reverse. Traditionally, process fluids are injected into the well tubing space (direct injection). However, in the ESS case, the variant is reverse injection through the well hole annulus.

[0092] Process fluids should be injected continuously at a rate preventing reduction in densities of the process fluids by floating gas.

[0093] A process fluid injection rate is determined by a formation pressure value and should be maximum, greater than a well capacity, on the condition that a pressure in the well is not higher than an allowable limit (according to results of a string pressure test).

[0094] Required densities of the process fluids are determined on the basis of calculations on the condition that a column of the process fluids generates a pressure higher than a current formation pressure by the safety factor.

[0095] A quantity of dry potassium chloride or calcium chloride required for preparing a needed volume of an aqueous solution having a certain density can be calculated according to the formula:

[00004]$M_r=\frac{Y_r*\left(Y_{\mathrm{kl}}-Y_w\right)*V_s*10}{Y_r-Y_w},$

[0096] where:

[0097] M.sub.r—reagent quantity, kg;

[0098] Y.sub.p—reagent specific weight, g/cm.sup.3;

[0099] Y.sub.kl—specific weight of process killing fluid, g/cm.sup.3;

[0100] Y.sub.w—specific weight of process water used for preparation of process fluids, g/cm.sup.3;

[0101] V.sub.s—required volume of an aqueous solution, m.sup.3.

[0102] As the final operations, the following works should be conducted at the well: [0103] 1. Check that all valves on the control equipment are closed. [0104] 2. Release pressure in the injection line, check that there is no excessive pressure. [0105] 3. Dismount the injection line avoiding spills of a process fluid (use of ecologically friendly pans is recommended). [0106] 4. Discharge pressure to the atmospheric value in the pipeline from the well to the group measuring unit.

[0107] Laboratory Studies of the ESS Physical Properties

[0108] In order to study the ES S physical properties, samples with different volumetric content of the components were prepared.

[0109] The following system parameters were determined in the experiments: [0110] density; [0111] thermal stability; [0112] dynamic viscosity; [0113] dynamic stability.

[0114] After the system samples were prepared, they were held at room temperature for at least 2 hours before starting the experiments.

[0115] Measuring ESS Density

[0116] The ESS sample densities were measured by the picnometric method (density of the water component was 1,200 kg/m.sup.3). The results are shown in FIG. 2.

[0117] Measuring ESS Thermal Stability

[0118] Thermal stability was measured by holding the ESS samples in graduated hermetically sealed cylinders in an oven for 8 hours, the temperature setting was 140° C. The test was considered as positive, if, after holding in the oven for 8 hours, not more than 2% by vol. of water was separated from the total volume of the ESS aqueous phase. It was experimentally determined that all the samples were stable.

[0119] Assessing ESS Rheological Properties

[0120] The results of dynamic viscosity and dynamic stability measurements of the ESS sample are shown in FIGS. 4 and 5. The measurements were taken with the use of a rotary viscometer PEOTECT RV 2.1 at 20° C. (temperature measurement error was ±0.1° C.). The following parameters were determined: [0121] effective (apparent) viscosity (mPa.Math.s) by forward and reverse measurements; [0122] shear stress (Pa) by forward and reverse measurements; [0123] dynamic stability.

[0124] Proceeding from the results of the complex laboratory studies of the ESS physical properties, the basic properties of the developed systems were determined that confirmed their high thermal stability and controlled rheology.

[0125] Exemplary Embodiments of the Method

EXAMPLE 1

[0126] The preparatory works were performed on a well: the well was shut off, depressurized; operability of the stop valves on the wellhead equipment was checked; a value of the current formation pressure was determined; the equipment and tools were arranged according to the approved layout; the equipment connections were made, and the injection line was tested for a pressure 1.5 times greater than the expected operating pressure; the injection line was equipped with a check valve.

[0127] Upon completion of the preparatory works, the operation on the ESS injection into a producing well was started.

[0128] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 426 m.sup.3: diesel fuel—5, an emulsifier—2, colloidal nanoparticles of silicon dioxide—1.0, a potassium chloride aqueous solution with the density of 1,120 kg/m.sup.3—92.0. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—40, amine oxide—0.7, a high-molecular organic thermostabilizer (lime-in-diesel fuel suspension)—0.5, diesel fuel—58.8. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in propylene glycol monomethyl ether—67.0, water—2.0.

[0129] The well was developed and put into operation with water-cut reduction by 47%.

EXAMPLE 2

[0130] In this and further examples the preparatory works were performed in accordance with the procedure described in Example 1.

[0131] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 302 m.sup.3: diesel fuel—7, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—1.25, a potassium chloride aqueous solution with the density of 1,170 kg/m.sup.3—89.25. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—41, amine oxide—0.8, a high-molecular organic thermostabilizer (lime-in-diesel fuel suspension)—0.7, diesel fuel—57.5. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—32.0 in propylene glycol monomethyl ether—67.0, water—1.0.

[0132] The well was developed and put into operation with water-cut reduction by 53%.

EXAMPLE 3

[0133] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 414 m.sup.3: diesel fuel—10, an emulsifier—3, colloidal nanoparticles of silicon dioxide—1.5, a potassium chloride aqueous solution with the density of 1,170 kg/m.sup.3—85.5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—42, amine oxide—1.0, a high-molecular organic thermostabilizer (lime-in-diesel fuel suspension)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—32.5 in propylene glycol monomethyl ether—67.0, water—0.5.

[0134] The well was developed and put into operation with water-cut reduction by 39%.

EXAMPLE 4

[0135] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 422 m.sup.3: diesel fuel—12, an emulsifier—3, colloidal nanoparticles of silicon dioxide—1.5, a potassium chloride aqueous solution with the density of 1,230 kg/m.sup.3—83.5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—42, amine oxide—1.0, a high-molecular organic thermostabilizer (lime-in-diesel fuel suspension)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in propylene glycol monomethyl ether—68.0, water—1.0.

[0136] The well was developed and put into operation with water-cut reduction by 62%.

EXAMPLE 5

[0137] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 433 m.sup.3: diesel fuel—12, an emulsifier—3, colloidal nanoparticles of silicon dioxide—1.5, a potassium chloride aqueous solution with the density of 1,200 kg/m.sup.3—83.5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—42, amine oxide—0.8, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.9, diesel fuel—56.3. The colloidal nanoparticles of silicon dioxide nanoparticles comprised, % by vol.: silicon dioxide—30.0 in isopropanol—68 and methyl alcohol—2.0.

[0138] The well was developed and put into operation with water-cut reduction by 24%.

EXAMPLE 6

[0139] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 378 m.sup.3: diesel fuel—11, emulsifier—2.8, colloidal nanoparticles of silicon dioxide—1.3, a potassium chloride aqueous solution with the density of 1,200 kg/m.sup.3—84.9. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—40, amine oxide—0.7, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.5, diesel fuel—58.8. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—30.5 in isopropanol—67.5 and methyl alcohol—2.0.

[0140] The well was developed and put into operation with water-cut reduction by 31%.

EXAMPLE 7

[0141] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 399 m.sup.3: diesel fuel—9, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—1.0, a calcium chloride aqueous solution with the density of 1,225 kg/m.sup.3—87.5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—41, amine oxide—1.0, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—57.0. The colloidal nanoparticles silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in isopropanol—68 and methyl alcohol—1.0.

[0142] The well was developed and put into operation with water-cut reduction by 51%.

EXAMPLE 8

[0143] The ESS of the following composition (% by vol.) was injected into a gas well in the amount of 415 m.sup.3: diesel fuel—7, an emulsifier—2.0, colloidal nanoparticles of silicon dioxide—1.4, a calcium chloride aqueous solution with the density of 1,225 kg/m.sup.3—89.6. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—40.5, amine oxide—0.8, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.6, diesel fuel—58.1. The colloidal nanoparticles silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in ethylene glycol—69.0.

[0144] The well was developed and put into operation with water-cut reduction by 26%.

EXAMPLE 9

[0145] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 415 m.sup.3: processed oil from an oil processing and pumping station—7, an emulsifier—2.0, colloidal nanoparticles of silicon dioxide—1.4, a calcium chloride aqueous solution with the density of 1,225 kg/m.sup.3—89.6. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—40.5, amine oxide—0.8, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.6, diesel fuel—58.1. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in isopropanol—67 and methyl alcohol—2.0.

[0146] The well was developed and put into operation with water-cut reduction by 25%.

EXAMPLE 10

[0147] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 504 m.sup.3: processed oil from an oil processing and pumping station—9, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—1.5, a calcium chloride aqueous solution with the density of 1,210 kg/m.sup.3—87.0. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—42.0, amine oxide—0.7, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—56.3. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in isopropanol—67 and methyl alcohol—2.0.

[0148] The well was developed and put into operation with water-cut reduction by 28%.

EXAMPLE 11

[0149] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 508 m.sup.3: processed oil from an oil processing and pumping station—10, emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.2, a calcium chloride aqueous solution with the density of 1,210 kg/m.sup.3—85.8. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—40.0, amine oxide—0.7, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—58.3. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—29.0 in ethylene glycol—71.0.

[0150] The well was developed and put into operation with water-cut reduction by 43%.

EXAMPLE 12

[0151] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 325 m.sup.3: processed oil from an oil processing and pumping station—12, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.0, a calcium chloride aqueous solution with the density of 1,220 kg/m.sup.3—84.0. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—41.0, amine oxide—0.9, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.8, diesel fuel—57.3. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—30.0 in ethylene glycol—70.0.

[0152] The well was developed and put into operation with water-cut reduction by 48%.

EXAMPLE 13

[0153] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 376 m.sup.3: processed oil from an oil processing and pumping station—12, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.5, a potassium chloride aqueous solution with the density of 1,220 kg/m.sup.3—83,5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—41.0, amine oxide—0.9, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.8, diesel fuel—57.3. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in ethylene glycol—69.0.

[0154] The well was developed and put into operation with water-cut reduction by 55%.

EXAMPLE 14

[0155] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 361 m.sup.3: processed oil from an oil processing and pumping station—5, emulsifier—2.0, colloidal nanoparticles of silicon dioxide—1.0, a potassium chloride aqueous solution with the density of 1,220 kg/m.sup.3—92.0. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—42.0, amine oxide—1.0, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide nanoparticles comprised, % by vol.: silicon dioxide—31.0 in ethylene glycol—69.0.

[0156] The well was developed and put into operation with water-cut reduction by 31%.

EXAMPLE 15

[0157] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 452 m.sup.3: processed oil from an oil processing and pumping station—6, an emulsifier—3.0, colloidal nanoparticles of colloidal silicon dioxide—1.4, a potassium chloride aqueous solution with the density of 1,220 kg/m.sup.3—89.6. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (linoleic) and resin acids—42.0, amine oxide—1.0, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in ethylene glycol—69.0.

[0158] The well was developed and put into operation with water-cut reduction by 47%.

EXAMPLE 16

[0159] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 445 m.sup.3: processed oil from an oil processing and pumping station—5, emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.5, a potassium chloride aqueous solution with the density of 1,210 kg/m.sup.3—90.5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—42.0, amine oxide—1.0, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—31.0 in propylene glycol monomethyl ether—67.0, water—2.0.

[0160] The well was developed and put into operation with water-cut reduction by 34%.

EXAMPLE 17

[0161] The ESS of the following composition (% by vol.) was injected into a gas-condensate well in the amount of 380 m.sup.3: processed oil from an oil processing and pumping station—12, emulsifier—2.0, colloidal nanoparticles of silicon dioxide—1.2, a potassium chloride aqueous solution with the density of 1,210 kg/m.sup.3—84.8. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—42.0, amine oxide—1.0, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—1.0, diesel fuel—56.0. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—32.0 in propylene glycol monomethyl ether—67.0, water—1.0.

[0162] The well was developed and put into operation with water-cut reduction by 52%.

EXAMPLE 18

[0163] The ESS of the following composition (% by vol.) was injected into a gas-hydrate well in the amount of 1,080 m.sup.3: processed oil from an oil processing and pumping station—9.0, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—1.5, a potassium chloride aqueous solution with the density of 1,205 kg/m.sup.3—87.0. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—41.0, amine oxide—0.7, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.5, diesel fuel—57.8. The colloidal nanoparticles silicon dioxide comprised, % by vol.: silicon dioxide—32.5 in propylene glycol monomethyl ether—67.0, water—0.5.

[0164] The well was developed and put into operation with water-cut reduction by 27%.

EXAMPLE 19

[0165] The ESS of the following composition (% by vol.) was injected into a gas-hydrate well in the amount 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—1.5, a potassium chloride aqueous solution with the density of 1,190 kg/m.sup.3—90.5. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—41.0, amine oxide—0.7, a high-molecular organic thermostabilizer (bentonite-in-diesel fuel suspension)—0.5, diesel fuel—57.8. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—30.0 in isopropanol—68 and methyl alcohol—2.0.

[0166] The well was developed and put into operation with water-cut reduction by 44%.

EXAMPLE 20

[0167] The ESS of the following composition (% by vol.) was injected into a gas-hydrate well in the amount of 982 m.sup.3: processed oil from an oil processing and pumping station—8.0, an emulsifier—3.0, colloidal nanoparticles of silicon dioxide—1.3, a calcium chloride aqueous solution with the density of 1,190 kg/m.sup.3—87.7. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—41.5, amine oxide—0.9, a high-molecular organic thermostabilizer (lime-in-diesel fuel suspension)—1.0, diesel fuel—56.6. The colloidal nanoparticles of silicon dioxide comprised, % by vol.: silicon dioxide—30.5 in isopropanol—67.5 and methyl alcohol—2.0.

[0168] The well was developed and put into operation with water-cut reduction by 40%.

EXAMPLE 21

[0169] The ESS of the following composition (% by vol.) was injected into a gas-hydrate well in the amount of 1,095 m.sup.3: processed oil from an oil processing and pumping station—10.0, an emulsifier—2.5, colloidal nanoparticles of silicon dioxide—1.2, a calcium chloride aqueous solution with the density of 1,175 kg/m.sup.3—86.3. The emulsifier comprised, % by vol.: esters of higher unsaturated fatty acids (oleic) and resin acids—42.0, amine oxide—1.0, a high-molecular organic thermostabilizer (lime-in-diesel fuel suspension)—0.7, diesel fuel—56.3. The colloidal nanoparticles of silicon dioxide nanoparticles comprised, % by vol.: silicon dioxide—31.0 in isopropanol—68 and methyl alcohol—1.0.

[0170] The well was developed and put into operation in the water-free condition with water-cut reduction by 38%.

[0171] Thus, the disclosure enables to optimize the process of treatment of the productive formation bottomhole zone, reduce water-cut of well products, reduce harmful impact on the environment owing to reversible nature of the shielding agent blocking effect, simplify implementation of the method due to its one-stage process, adjust the shielding agent rheological parameters, reduce labor inputs and improve technological efficiency of operation of gas, gas-condensate, or gas-hydrate wells.