RU2507371C1 - Method of horizontal well construction in sections of unstable strata (versions) - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises driving the vertical section, initial zenith angle borehole deviation section, and sections of zenith angle increase with outcrop to horizontal, and driving horizontal borehole using techniques of driving and drilling in unstable strata. Vertical section and sections with zenith angle increase to 70° are driven with the help of polymer-emulsion water-based mud (PEWM). Sections with zenith angles over 70° and horizontal borehole composed by stable carbonate and unstable terrigenous deposits are drilled using hydrocarbon-based mud (HCBM). Portion of the latter is replaced by phase inversion with PEWM on reaching the design depth and forced in through borehole. Aforementioned techniques are changing between PEWM and HCBM by phase inversion in drilling. Changing PEWM into HCBM is performed by mixing PEWM with A inverter, that is, the mix of hydrocarbon fluid with inverse emulsion with NAEI making the active component, said NAEI being based on polyglycol ethers of fat acids or alcohols with NLB number not over 10 at hydrocarbon fluid-to-emulsifier ratio making 14-19:1, respectively, A inverter being added in amount of 28-35 vol. %. Subsequent changing HCBM into PEWM is made by adding B inverter to the latter, that is, the mix of direct emulsion emulsifier thereto with NAEI making the active component being based on polyglycol ethers of fat acids or alcohols with NLB number not over 11-14, with dioxane alcohol with weight ratio of hydroxyl groups of 15-36% at emulsifier-to-alcohols ratio of 2-3.5:1, respectively, B inverter being added to HCBM in amount of 1.75-4 vol. %. In compliance with another version, stable carbonate strata horizontal hole driving and drilling are performed using HCBM. Driving the sections in above-productive interval is performed with zenith angles over 70° with the help of PEWM. After reaching the design depth of horizontal hole, PEWM is forced in through borehole.

EFFECT: possibility of drilling over terrigenous Devonian deposits with unlimited zenith angles.

14 cl, 7 tbl

Description

The invention relates to the oil industry and can be used in the construction of shallow and horizontal wells in difficult hydrogeological conditions, namely, when passing large intervals of potentially unstable terrigenous deposits with large zenith angles, and opening the reservoir with a conventionally horizontal well (in particular, when choosing drilling solutions that meet the requirements of well construction in such conditions).

The features of posting shallow and horizontal sections of the wellbore in the intervals of unstable deposits, which to the greatest extent determine the requirements for drilling fluids, are as follows:

- violation of the stability of the walls of the borehole as a result of longer contact of the drilling fluid and its filtrate with unstable terrigenous deposits compared to vertical and directional wells;

- significantly worse wellbore cleanup in the wellbore section with zenith angles of more than 60 ° due to changes in flow hydrodynamics compared to the vertical part of the wellbore, which leads to mud clogging and sticking of the drilling tool;

- the occurrence of excess torque due to increased friction of the drilling tool lying in a horizontal plane.

Since the horizontal wellbore reveals productive deposits, all of the above factors negatively affect the productivity of the well, as the contact time of the drilling fluid with the reservoir increases.

One of the most important factors for successful drilling of shallow and horizontal wells is the quality of the drilling fluid. When drilling wells in difficult conditions, namely, when drilling the trunk through unstable deposits with large zenith angles (shallow and horizontal wells), highly inhibited drilling fluids are used, in particular, polymer-emulsion drilling fluids based on water or hydrocarbon.

The following technological measures are known to maintain the stability of the wellbore while drilling through unstable terrigenous deposits during the construction of shallow and horizontal wells:

- limiting the angle of inclination of the wellbore in the intervals of unstable terrigenous deposits to 60 degrees when using water-based drilling fluids;

- the use of inhibitory additives in the composition of water-based drilling fluids to reduce the rate of clay hydration;

- installation of cement bridges in the intervals of unstable terrigenous deposits after their opening with washing with a highly inhibited water-based drilling fluid;

- changing the design of the well, namely, opening the interval of unstable terrigenous deposits at an zenith angle of not more than 60 degrees with flushing with a highly inhibited water-based drilling fluid, closing this interval by lowering the casing, cementing it, then drilling the well with a bit of a smaller diameter with a set of zenith angle and access to the horizontal, and drilling of a horizontal well with flushing with a highly inhibited water-based drilling fluid;

- opening the interval of unstable terrigenous deposits at an zenith angle of more than 60 degrees using hydrocarbon-based drilling fluids (invert emulsion drilling fluids).

A known method of construction of shallow and horizontal wells with the passage of intervals of unstable clay deposits with zenith angles of more than 70 degrees using invert emulsion drilling fluids (NTZH Oil. Gas. Novation, No. 10, 2009, p. 45-48, "Features of invert emulsion drilling fluids during the drilling of shallow and horizontal wells in the fields of LLC “LUKOIL-PERM”). An analysis of well construction at the fields showed that when drilling wells with flushing with clayey and clayless inhibited drilling fluids based on water, in which the zenith angle of the wellbore in terrigenous unstable sediments is more than 70 °, complications associated with borehole instability were observed. In order to reduce the likelihood of complications and accidents during drilling in the interval of drilling terrigenous deposits with an zenith angle of the wellbore of more than 70 °, it is proposed to use an invert emulsion solution (IER). The use of IER in the overhead interval of wells with an zenith angle of more than 70 ° allows reliable inhibition of terrigenous deposits, while actively correcting the well path along the zenith angle and azimuth, which cannot be achieved using water-based drilling fluids.

However, the method of constructing wells using only the ESI is not without drawbacks. The disadvantage of this method is the need to use an invert emulsion solution over the entire drilling interval of unstable terrigenous deposits, including at zenith angles less than 70 °, which necessitates the preparation of a large volume of hydrocarbon-based drilling fluid, which is technologically and economically unjustified.

In addition, after using the ESI, it is necessary to prepare the wellbore for subsequent cementing by using special buffer compositions for various purposes that remove the remnants of the hydrophobic invert emulsion solution from the walls of the well and casing and hydrophilize the surface of the casing and well walls to ensure tight contact of cement with the casing and breed. In addition, in the process of drilling with washing of the IEM, an accumulation of large amounts of environmentally hazardous drilling waste to be disposed of occurs.

If two types of drilling fluids (water-based and ESI) are used in the construction of horizontal wells, this causes certain difficulties. With this technology (traditional replacement of one type of drilling fluid with another), a large volume of water-based drilling fluid must be disposed of and a new volume of hydrocarbon-based fluid must be prepared for further drilling. These operations require additional time and material resources for the removal and disposal of one solution and the procurement of a new type of solution; there is a need to have a stock of additional tanks for temporary storage of spent drilling fluid and for the preparation of a drilling fluid based on hydrocarbon.

All this leads to an increased environmental hazard of the drilling process due to the large volumes of drilling waste to be disposed of.

In addition, the implementation of the known method provides for a long shutdown of the drilling process to completely replace one type of solution with another, i.e. when using this method, unproductive time increases during well construction and, accordingly, the commercial drilling speed decreases.

The closest to the proposed technical solution for its intended purpose is a method of constructing a horizontal well in unstable deposits (RF Patent No. 2421586), according to which a vertical section, an initial curvature section with a set of zenith angle according to the project, a section of a set of zenith angle with horizontal access, are drilled horizontal wellbore, in which to prevent erosive destruction and the formation of caverns in the wellbore in the intervals of unstable Devonian terrigenous rocks Fat (namely, rocks kynovskogo horizon) and reduce the probability of sticking the drill tool zenith angle limit value at which the tested unstable kynovskogo clay horizon, namely clay horizon kynovskogo tested under the zenith angle of less than 60 °.

Moreover, if the zenith angle is 50-60 °, then the casing is lowered into the well with the entrance to the upper limestone and cemented, and after casing the casing string with a diameter of 168 mm or 178 mm of drilled unstable intervals, drilling continues according to the design profile with a smaller bit diameter starting from the shoe of the production casing.

If the zenith angle is 45-40 ° or less, then the well is cased with a casing and cemented after reaching the design bottom of the well of the productive horizon by drilling along the design profile. At the same time, the Kyn horizon and below are drilled in the guaranteed laminar flow mode in the annular annular channel using a water-based viscoplastic drilling fluid with fastening properties, with minimal water loss and the required density.

The disadvantage of this known method is that when drilling through unstable rocks with an zenith angle of 50-60 °, the only technical solution is provided for - complication of the well’s design due to the need to block them with casing immediately after opening unstable intervals, and conduct further drilling of the well to the design depth bit of smaller diameter. This leads to an increase in the metal consumption of the well structure, and, consequently, to an increase in the cost of well construction. At the same time, the opening of the productive formation with a bit of a smaller diameter ultimately reduces the production capabilities of the well due to the lowering of production equipment of a smaller diameter.

It should be pointed out that the known technical solution does not allow to eliminate the causes leading to the violation of the stability of the Kyn clay, namely to prevent their hydration due to the physicochemical processes of the interaction of potentially unstable mudstones with a water-based drilling mud filtrate, and suggests a number of technical and technological measures, increasing the time period for maintaining the stability of clay rocks by limiting the set of zenith angle in the interval of unstable clays (not more than 60 °) and limiting the speed oskhodyaschego flux (prerequisite - laminar flow regime).

In addition, the disadvantage of this method is the limited conditions for its use when drilling a well onto a productive formation, folded by sandstones and exposed by a horizontal wellbore, since the method provides for mandatory opening of the productive formation with a bit of a smaller diameter even if unstable Kynovskiy clays were opened at an angle of 40- 45 ° (see the last example in this patent).

The single technical result achieved by the implementation of the claimed group of inventions is:

- expanding the scope of the method for constructing horizontal wells in unstable terrigenous deposits, namely, the possibility of drilling wells using terrigenous Devonian deposits (including Kyn clay) without limiting the zenith angle (at zenith angles of more than 60 °), as well as the possibility of drilling wells on a productive formation, opened by a horizontal wellbore, composed of sandstones and located directly under unstable rocks, without changing the design of the wells;

- decrease in metal consumption of the well structure;

- reduction of material, time and labor costs.

- increasing the stability of terrigenous rocks exposed at large zenith angles (more than 60 °) by ensuring maximum hydrophobization of the rocks of the unstable interval during drilling (with washing with a drilling fluid based on a hydrocarbon-based IER).

The specified technical result is achieved by the proposed method for constructing horizontal wells in the intervals of unstable deposits, including the sinking of the vertical section, the initial curvature section with a set of zenith angle, sections of the set of zenith angle with horizontal access and drilling of a horizontal wellbore, using technological techniques for drilling and drilling in unstable deposits, while new in the first embodiment is that the penetration of the vertical section and sections with a set of anti-aircraft angles of up to 70 ° are carried out using a water-based polymer-emulsion drilling fluid BRVO, and the drilling of sections with zenith angles of more than 70 ° and the drilling of a horizontal shaft, represented by both stable carbonate and unstable - terrigenous rocks, are carried out using a drilling fluid on hydrocarbon based on BRUO, part of which, in the volume of an open drilled well, when the design depth is reached, is replaced by phase inversion by BRVO, which is pumped along the wellbore, and as a technologically advanced x receptions use the method of converting BRVO to BRUO and back to BRVO by phase inversion directly during drilling, while transferring BRVO to BRUO is performed by mixing BRVO with inverter A to obtain an inverse emulsion, which is a mixture of a hydrocarbon liquid with an inverse emulsion emulsifier that is active the beginning of which is a nonionic surfactant based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of not more than 10, with a volume ratio of carbon hydrogen chloride liquid: the specified emulsifier as (14 ÷ 19): 1, respectively, whereby the inverter A is added to the BRVO in the volume amount of 28-35 vol% to obtain the inverse emulsion, and the subsequent conversion of the obtained BROO to the BRVO is carried out by adding inverter B to it method of producing a direct emulsion, which is a mixture of a direct emulsion emulsifier, the active principle of which is nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance 11-14 , with dioxane alcohols with a mass fraction of hydroxyl groups within 15-36%, with a volume ratio of the specified emulsion emulsifier direct emulsion: the specified dioxane alcohols as (2 ÷ 3,5): 1, respectively, while the inverter B is added to the BROO to obtain a direct emulsion in a volumetric amount of 1.75-4 vol.%; and according to the second variant - drilling of a vertical section, sections with a set of zenith angle up to 70 °, as well as drilling of a horizontal shaft represented by stable carbonate rocks, are carried out using a water-based polymer-emulsion drilling mud BRVO, and sections are drilled in a superproductive interval with anti-aircraft angles of more than 70 ° are carried out using a BRUO hydrocarbon-based drilling fluid, and after reaching the design depth of the horizontal well, the BRVO is pumped along the wellbore, moreover, as The process uses the method of converting BRVO to BRUO and back to BRVO by phase inversion directly during drilling, while transferring BRVO to BRUO is performed by mixing BRVO with inverter A to obtain an inverse emulsion, which is a mixture of a hydrocarbon liquid with an inverse emulsion emulsifier, which is active the active principle of which is a nonionic surfactant based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of not more than 10, with a volume the ratio of hydrocarbon liquid: the specified emulsifier as (14 ÷ 19): 1, respectively, whereby the inverter A is added to the BRVO in the volumetric amount of 28-35 vol% to obtain the inverse emulsion, and the subsequent conversion of the obtained BRUO to the BRVO is carried out by adding an inverter to it B to obtain a direct emulsion, which is a mixture of a direct emulsion emulsifier, the active active principle of which is nonionic surfactants based on polyglycol esters of fatty acids or hydrophilic lipo alcohols filial balance 11-14, with dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, with a volume ratio of the specified emulsion emulsifier direct emulsion: the specified dioxane alcohols as (2 ÷ 3,5): 1, respectively, while inverter B to obtain direct emulsions are added to BRUO in a volumetric amount of 1.75-4 vol.%.

Moreover, for both options:

- as BRVO use a clayey drilling mud with a clay content of not more than 5% or clayless drilling mud.

- as BRVO use a polymer-emulsion drilling fluid, including a polymer, an alkaline surface-active emulsifier-stabilizer direct emulsion, the hydrocarbon phase and saline water.

- as a hydrocarbon liquid, the invert emulsion inverter contains mineral oils, or esters of vegetable oils, or diesel fuel.

- as an inverse emulsion emulsifier, an invert emulsion inverter includes Neonol AF _9-4 , or Sinoxol m. A, or Aminadet N;

- as emulsifiers of direct emulsion, the active principle of which are nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of 11-14, use Neonol AF _9-12 or a mixture of Neonol AF _9-4 and Neonol AF _9-12 in a volume ratio of 1 ÷ 0.7-9 for the regulation of HLB, or Synoxolum m. In;

- Flotoreagent-oxal T-92, or Burflub-BT, or DSPB-BS is used as dioxane alcohols with a mass fraction of hydroxyl groups within 15-36%.

The technical result is achieved due to the following. Due to the fact that, according to the first embodiment, the vertical section and sections with a zenith angle of up to 70 ° are drilled using polymer-emulsion BRVO, and the sections with zenith angles of more than 70 ° are drilled and the horizontal shaft is represented, which is represented by both stable and unstable rocks, lead using BRUO, part of which, in the volume of the open hole, when the design depth is reached, is replaced by BRVO, which is pumped along the wellbore to hydrophilize the filter cake, it is possible drilling wells using terrigenous Devonian deposits (including Kyn clays) without limiting the zenith angle (at zenith angles of more than 60 °), as well as the possibility of drilling a well into a productive formation opened by a horizontal wellbore, composed of sandstones and located directly under unstable rocks, without changing the design of the wells. At the same time, the stability of terrigenous rocks exposed at large zenith angles (more than 60 °) is maintained due to the maximum hydrophobization of the rocks of the unstable interval during drilling using BRUO; the design of the well is simplified, its metal consumption is reduced; the quality of well cementing increases (due to the preparation of the wellbore for cementing and maintaining the nominal size of the wellbore in the interval of unstable rocks), material, time and labor costs are reduced.

And due to the fact that, according to the second option, the drilling of the vertical section, sections with a set of zenith angle up to 70 °, as well as the drilling of a horizontal shaft (opening the reservoir), represented by stable carbonate rocks, are carried out using BRWO, and the drilling of sections with zenith angles of more than 70 ° in the superproductive interval are using BRUO, provides:

- maintaining the stability of terrigenous rocks exposed at large zenith angles (more than 60 °) by ensuring maximum hydrophobization of the rocks of the unstable interval during drilling (with flushing of BRUO) while maintaining the informativeness of geophysical surveys in the interval of the reservoir through the use of BRVO and reducing waste drilling with a high content of hydrocarbon fraction.

Using as methods in the implementation of both variants of the proposed method, the method of converting BRVO into BRUO and back to BRVO by phase inversion directly during drilling allows you to quickly adjust the inhibitory and hydrophobizing properties of the drilling fluid during drilling, as well as hydrophilicity and hydrophobicity (filter cake) bottom-hole zone of the well to ensure high quality opening of the reservoir, quality of cementing and informativeness of geophysical surveys vany.

The recipe composition of inverter A to obtain the inverse emulsion was chosen based on the need to obtain an invert emulsion drilling fluid based on a clayey and clayless drilling mud with properties that meet the requirements for drilling a wellbore through unstable deposits with large zenith angles (shallow and horizontal wells).

A prescription composition of the inverter B to obtain a direct emulsion was chosen based on the need to obtain BRVO based on BRUO with properties that meet the requirements when opening a productive formation with a horizontal shaft.

The quantitative ratio of these inverters and the corresponding drilling fluids was determined experimentally and it was proved that going beyond the declared quantitative limits does not ensure the production of inverted drilling fluids, both on a hydrocarbon basis and on a water basis with the necessary physicochemical and technological properties for drilling gentle and horizontal wells in unstable deposits and for opening productive formations.

Thus, only thanks to the combination of operations of the proposed method, both in the first and in the second embodiment, it ensures the achievement of the set result, namely:

- expanding the scope of the method for constructing horizontal wells in unstable terrigenous deposits, namely, the possibility of drilling wells using terrigenous Devonian deposits (including Kyn clay) without limiting the zenith angle (at zenith angles of more than 60 °), as well as the possibility of drilling wells on a productive formation, opened by a horizontal wellbore, composed of sandstones and located directly under unstable rocks, without changing the design of the wells;

- decrease in metal consumption of the well structure;

- reduction of material, time and labor costs.

- maintaining the stability of terrigenous rocks exposed at large zenith angles (more than 60 °) by ensuring maximum hydrophobization of the rocks of the unstable interval during drilling (with flushing of BRUO).

Implementation of the proposed method in the field is as follows.

According to the first option:

Construction of a directional well with horizontal completion on Devonian (unstable) deposits without changing the design of the well (i.e. it is proposed to open the reservoir with the same bit).

Table 1 shows the data on the zenith angles of the wellbore by stratigraphic section. Table 2 shows the profile of the wellbore. Table 3 shows the well information using the proposed technology.

In this field, when drilling vertical and directional wells when drilling under the production casing from the roof of the Tula deposits to the design depth, a low-clay BRVO was used, and when drilling with horizontal completion, in the same interval of the BRUO, and a productive formation with a horizontal well is drilled with a smaller bit diameter also using BRUO. The following solutions were used:

- low-clay BRVO, wt.%: clay powder - 1%; reagent - stabilizer - 0.5%; hydrocarbon phase - 2%; K ₂ SiO ₃ - 1.0%; KCl - 3%; starch (Buramil) - 1.5%; TV (industrial water) - 91.0%;

- Inverter A: volumetric ratio of diesel fuel: Sinoksol m. And as 14: 1; Its volume ratio with BRVO is 30% to 70%, respectively 4

- Inverter B: Neonol AF _9-12 (HLB = 14) and Oxal T-92 with a volume ratio of 2: 1. Its volume ratio with IER (mixture of BRVO with inverter A) was 3 vol.% To 97 vol.%.

As can be seen from table 3, in the process of implementing the proposed method according to the first embodiment, during the well construction cycle, with an increase in the zenith angle of more than 60 ° in terrigenous deposits, the low-clay BRWO is converted (inverted) to the reverse emulsion (BRUO) at a depth of 2381 m and the inverted BRUO in direct emulsion BRVO after reaching the design depth, i.e. after opening the reservoir in the Timan deposits of the Vendian complex with a horizontal trunk.

According to the second option:

Construction of a directional well with horizontal completion with a change in the design of the well (completion of the well with an open wellbore of stable carbonate deposits). Table 4 provides general information about the design of the well, in table 5 - data on the type of drilling fluids used and the profile of the wellbore. When implementing the method according to the second embodiment, the same solutions and inverters were used as in the first embodiment.

As can be seen from the presented tables 4 and 5, according to the second option, in the process of implementing the proposed method during well construction with an increase in the zenith angle of more than 60 ° in terrigenous deposits, the BRVO is converted (inverted) into the inverse emulsion of the BRUO, and after cementing the production string, the inverted BRUO into the direct emulsion BRVO for opening the reservoir by a horizontal well in carbonate deposits.

To prove the conformity of the properties of the obtained drilling fluids during the reverse transfer from BRVO to BRUO and vice versa with the required technological parameters, the proposed method was simulated in laboratory conditions and the fluids and compositions required for its implementation were investigated. In the tests, the following substances were used:

Inhibited water based polymer-emulsion drilling mud:

- low-clay polymer-emulsion drilling mud (MGBR) according to the patent of the Russian Federation No. 2386656 of the following composition: clay powder - 1%; reagent - stabilizer - 0.5%; hydrocarbon phase - 2%; K ₂ SiO ₃ - 1.0%; KCl - 3%; starch (Buramil) - 1.5%; TV (industrial water) - 91.0%;

- clayless polymer-emulsion drilling fluid:

a) BBR No. 1 Reocel - 0.3; Sintal - 0.5; starch - 1.5; Burflub-BT - 3; SAF - 1; K ₂ SiO ₃ - 1; NaCl - 15; KCl - 5; process water - 72.7.

b) BBR No. 2 of the following composition: (mass%): Reocel B - 0.3; Sintal - 0.5; SAF - 0.5; DSPB-BS - 3.0; NaCl - 15; KCl - 5; CaCl ₂ 23.0; Buramil - 1.5; process water (TV) - 51.2.

Reagents for the preparation of inverter A to obtain a reverse emulsion and inverter B to obtain a direct emulsion:

- nonionic surfactant nonionic surfactants (Neonol AF _9-12 ) TU 2483-077-05766801-98 (HLB = 14);

- nonionic surfactants (Neonol AF _9-4 ) TU 2483-077-05766801-98 (HLB = 8.8);

- Aminadet N (for import) (HLB = 6);

- Sinoksol m. A TU 2458-082-40912231-2012 (HLB = 8.8);

- Sinoksol m. In TU 2458-082-40912231-2012 (HLB = 14);

- Hydrocarbon reagent (HC): mineral oils (industrial oil brand IP-8, IP-12 GOST 20799-88; transformer oil, TU 38-401978-98), diesel fuel GOST R 52368-2005;

- Organobentonite TU 952752-2000;

- Flotoreagent-oxal T-92 TU 2452-029-05766801-94;

- Burflyub-BT-TU 2452-018-40912231-2003;

- DSPB-BS TU 2452-002-52412574-00;

- Reocel m. In TU 2231-012-40912231-2003;

- Reoxan m. In TU 9189-002-40912231-2003.

Example. Inverter A was prepared to obtain an inverse emulsion, for which 112 cm ^{3 of} diesel fuel was poured into a beaker from a Hamilton Beach mixer, and 8 cm ^{3 of} non-ionic surfactant (SAS) of the Sinoxol brand A inverse emulsion emulsifier was added to it with stirring. 8.8) and 30 minutes were mixed on a laboratory stirrer at n = 500 rpm. Then, 280 cm ³ RBI No. 1 was introduced into the resulting inverter A at n = 1000 rpm in a thin stream, the mixture was stirred on a laboratory stirrer at a speed of 1000 rpm for 30 minutes, then it was dispersed for an additional 6 minutes on a Hamilton Beach mixer at n = 13000 rpm, after which a BROF based on BRVO was obtained by phase inversion with the following content of components, vol.%: inverter A (with a volume ratio of diesel fuel: Sinoksol m. A as 14: 1, respectively) - 30.0; water-based polymer-emulsion drilling mud - 70.0 (table 6 composition 7; table 7 composition 7).

Then, in order to transfer the obtained reverse emulsion (BROO) to BRVO, which is a direct oil-in-water emulsion, an inverter B was prepared to obtain a direct emulsion, for which 8 cm ^{3 of a} direct emulsion emulsifier Neonol AF _9-12 (HLB = 14) were mixed with 4 cm ³ Oxal T-92 with a volume ratio of 2: 1. Then, to 400 cm ^{3 of} the previously obtained BROF, 12 cm of the prepared inverter B was added, the mixture was stirred on a laboratory mixer for 30 minutes at n = 1000 rpm, after which a polymer-emulsion drilling fluid (direct emulsion) based on BRUO was obtained by phase inversion with the following content of components, vol.%: inverter B (with a ratio of Neonol AF _9-12 : Oxal T-92, respectively 2: 1) - 3.0; BRUO - 97.0 (table 6 composition 13; table 7 composition 13).

In other cases, when the direct emulsion was converted into the reverse emulsion and again into the direct emulsion, the solutions were prepared in a similar way, they differed only in the concentrations and compositions of emulsifiers of direct and inverse emulsions and, accordingly, in the ratio of emulsifier to HC in inverter A and the ratio of emulsifier and dioxane alcohols in inverter B, as well as the ratio of inverter to invert drilling fluid.

For additional regulation of the technological properties of invertible drilling fluids, reagents traditionally used in the drilling process were used. For example, in the case of inverse emulsion inversion in BROF, the density of the solution decreases due to the addition of a hydrocarbon phase; therefore, for maintaining the density, for example, calcium chloride or barite or calcium carbonate can be used. When converting BRUO to direct emulsion, if it is necessary to reduce the density of the direct emulsion, technical water is added, while it is possible to increase filtration properties and reduce rheological parameters, therefore, to restore these indicators, for example, a reagent based on xanthan gum (Reoxan m. B), reagent the basis of hydroxyethyl cellulose (Reocel m. B), starch and other reagents.

Table 6 and 7 shows data on the composition and properties of emulsion drilling fluids obtained by inverting forward and reverse emulsions by the present method.

The data shown in the table show that drilling fluids obtained by inverting water and hydrocarbon-based emulsion drilling fluids when implementing the proposed method for well construction, by their properties, satisfy the requirements for flat and horizontal wells in complicated conditions, because characterized by:

- high inhibitory and hydrophobizing properties: the degree of erosion of sludge from clay rocks 0-2%, which will allow to maintain the stability of clay rocks;

- optimal rheological characteristics: plastic viscosity 28-86 cps, dynamic shear stress 141.6-257.6 dPa, gel strength 25.5-71.5 / 28-81.8 dPa, which will provide the necessary remote and holding ability of the drilling solution;

- high lubricating properties: a friction coefficient of 0.099-0.13, which will prevent sticking in highly curved and horizontal sections of the wellbore, facilitate the passage of the drill string, improve working conditions of the rock cutting tool at the bottom;

- low filtration properties: the filtration rate is 0-2 cm ³ at ΔP = 0.7 MPa, which will prevent the penetration of large volumes of drilling fluid and filtrate into the near-well zone.

The advantages of the proposed method for the construction of horizontal wells in the intervals of unstable deposits in both options compared to the prototype are as follows:

- increasing the stability of terrigenous rocks exposed at large zenith angles (more than 60 °), due to the use of BRUO, which provides maximum hydrophobization of rocks of an unstable interval during drilling, which will prevent complications during drilling during the opening of unstable rocks, prone to talus and collapses, and reduce the time and money spent on well construction;

- expanding the scope of the method for constructing horizontal wells in unstable terrigenous deposits, namely, the possibility of drilling wells using terrigenous Devonian deposits (including Kyn clay) without limiting the zenith angle (at zenith angles of more than 60 °), as well as the possibility of drilling wells on a productive formation, opened by a horizontal wellbore, composed of sandstones and located directly under unstable rocks, without changing the design of the wells;

- reduction of material, time and labor costs;

- reducing the negative impact of the drilling fluid on the reservoir properties of the reservoir by increasing the hydrophobic and inhibitory properties of the inverted drilling fluid, both water and hydrocarbon-based, which will improve the quality of the opening of the reservoir and reduce the time of well completion.

Table 1 - Zenith angles of the wellbore stratigraphic section Depth (along the trunk), m Stratigraphic Unit Index Zenith angle, degree 0 10 Quaternary deposits 0 0 10 one hundred Kazan tier 0 1.00 one hundred 251 Sheshminsky horizon 1.00 4.17 251 402 Solikamsk skyline 4.17 11.49 402 496 Irensky horizon 11.49 20.80 496 561 Philippine skyline 20.80 24.89 561 698 Artinsky tier 24.89 29.76 698 825 Sakmara + Assel tiers 29.76 29.76 825 986 Upper carbon 29.76 29.76 986 1101 Myachkovsky horizon 29.76 29.76 1101 1228 Podolsky skyline 29.76 29.76 1228 1285 Kashira skyline 29.76 29.76 1285 1348 Verey skyline 29.76 27.87 1348 1417 Bashkir 27.87 29.84 1417 1746 Serpukhovsky + Oka over-horizon 29.84 29.84 1746 1769 Tula carbonate horizon 29.84 29.84 1769 1798 Tula terrigenous horizon 29.84 29.84 1798 1855 Bobrikovsky horizon 29.84 29.84 1855 1913 Radaevsky horizon 29.84 29.96 1913 2292 Tournaisian Tiers 29.96 53.37 Vendian complex 2292 2381 Famensky 53.37 60.40 2381 2471 Verkhnefransky substage 60.40 67.49 2471 2617 Srednefransky substage 67.49 79.91 2617 2927 Timan skyline 79.91 89.60

Table 2 Wellbore Profile 0-90 m conventionally vertical section; 90-190 m plot of zenith angle up to 10 ° in azimuth 300 ° with intensity up to 1 ° / 10 m; 190-523 m plot for zenith angle up to 23.45 ° and azimuth reversal up to 133.29 ° with intensity up to 1 ° / 10 m; 523-553 m plot for zenith angle up to 24.05 ° with intensity up to 0.2 ° / 10 m; 553-610 m plot for zenith angle up to 29.76 ° and azimuth reversal up to 132.35 ° with intensity up to 1 ° / 10 m; 610-1285 m plot of conditional stabilization; 1285-1348 m plot to reduce the zenith angle to 27.88 ° with an intensity of up to 0.3 ° / 10 m; 1348-1368 m plot of zenith angle set up to 29.84 ° with intensity up to 1.0 ° / 10 m; 1368-1908 m Plot of conditional stabilization; 1908-2618 m plot of zenith angle up to 80 ° with intensity up to 1 ° / 10 m; 2618-2629 m plot for zenith angle up to 81.1 ° and azimuth reversal up to 63.28 ° with intensity up to 1 ° / 10 m; 2629-2634 m plot to reduce the zenith angle to 81 ° with an intensity of up to 0.2 ° / 10 m; 2634-2663 m plot for zenith angle up to 89.6 ° with intensity up to 3 ° / 10 m; 2663-2927 m conditional stabilization section Table 3 - General information on the well using the proposed technology Well assignment Mining Type of wells Inclined with horizontal ending The diameter of the previous column 245 mm Depth of descent of the previous column 530 m Design Depth Vertical D3tm - 2200 Reservoir pressure: ch. 2180M-D3tm 23.6 MPa Drill bit diameter for electric drill string 215.9 mm Fresh water drilling interval ρ = 1000 kg / m ³ 530-825 m Mineralized water drilling interval ρ = 1050 kg / m ³ 825-1719 m The drilling interval for the production casing on a low-clay polymer-emulsion drilling mud (MBGR) ρ = 1160 kg / m ³ 1719-2381 m The drilling interval for the production casing on the IER ρ = 1160 kg / m ³ obtained on the basis of the MBGR by phase inversion 2381-2927 m Replacing part of the IEM with a water-based drilling fluid by phase inversion to hydrophilize the filter cake before cementing the production string 2927 m

Table 4 Well design Column name Diameter mm The interval of descent (along the trunk), m from (top) to (bottom) Direction 426 0 fifteen Conductor 324 0 80 Technical 245 0 288 Operational 168 0 1694 Open trunk 146 1694 1943 Table 5 Data on the type of drilling fluids and wellbore profile Type of solution Interval, m Profile Clay solution 15-288 0-110 m - conventionally vertical section; 110-288 m - plot of zenith angle up to 17.78 ° and azimuth reversal up to 150 ° with intensity up to 1710 m Process water 288-679 288-580 m - section of the zenith angle set up to 23.63 ° and at an azimuth of 150 ° with an intensity of up to 0.2710 m; 580-690 m - section for reducing the zenith angle to 19.3 ° and turning in azimuth to 110.3 ° with an intensity of 27100 m Mineralized water with a density of 1150 kg / m ³ 679-826 690-928 m - plot for zenith angle up to 37.68 ° and azimuth reversal up to 49.98 ° with intensity up to 1.35710 m Clayless polymer-emulsion drilling mud (BBR-PMG) 826-1470 928-1038 m - conditional stabilization section; 1038-1529 m - plot for zenith angle up to 64.0 ° and azimuth reversal up to 318.0 ° with intensity up to 1.43710 m Invert-emulsion drilling fluid obtained on the basis of BBR-PMG and inverter A 1470-1694 1529-1568 m - a section of conditional stabilization at an anti-aircraft angle of 64.0 ° and an azimuth of 318.0 °; 1568-1694 m - plot for zenith angle up to 82.0 ° and azimuth reversal up to 303.67 ° with intensity up to 1.79710 m The polymer-emulsion drilling fluid obtained on the basis of the IER and inverter B 1694-1943 1694-1709 m - conditional stabilization section; 1709-1734 m - section of the zenith angle set up to 89.0 ° at an azimuth of 303.67 ° with an intensity of up to 3710 m; 1734-1943 m - a section of a low-intensity decrease in the zenith angle to 84.607 ° at an azimuth of 303.67 ° with an intensity of up to 2.17100 m

Table 6. The composition of the reversible-invertible drilling fluid according to the proposed method and the known mud of the prototype Composition number The composition of the solution, vol.% the ratio of drilling fluid and inverter, vol.% HC ratio: Emulsifier in inverter A Emulsifier: dioxane alcohols ratio in inverter B Additional reagents,% polymer water weighting agent organobentonite IGBF No. 1 (according to patent No. 2386656) one 100/0 BBR No. 1 2 100/0 BBR No. 2 3 100/0 Polymer clay mud according to the prototype four 100/0 Inverted drilling fluid according to the claimed method of construction of wells 5 72/28 17.7: 1 one 6 70/30 14: 1 one 7 70/30 19: 1 one 8 70/30 14: 1 26.7 (CaCl ₂ ) 9 70/30 14: 1 14.0 CaCo ₃ 10 65/35 14: 1 11.6 Barite eleven 100/3 2: 1 12 100/2 3: 1 13 100 / 2.25 3.5: 1 fourteen 100 / 3,5 2.5: 1 fifteen 100 / 3.75 2.75: 1 16 100 / 3.75 2.75: 1 0.1 twenty 17 100/4 3: 1 0.1 twenty one Notes: 1. In experiment No. 5, the IYBG No. 1 was used; in experiments No. 6, 7, 9, 10 used BBR No. 1; in experiment No. 8, DBR No. 2 was used;
2. In experiment No. 11, solution No. 5 was used; in experiments No. 12, 3 used solutions No. 6, 7; in experiment No. 14, solution No. 8 was used; in experiments No. 15, 6, solution No. 9 was used; in experiment No. 17, solution No. 10 was used.
3. In experiments No. 5, 6 and 7, the emulsifier Neonol AF _{9-4 was used} ; in experiments No. 8.9 used the emulsifier Sinoksol m. A; in experiment No. 10, the emulsifier Aminadet N. was used.
4. In experiments No. 5-7 used diesel fuel, in experiments No. 8, 9 used industrial oil brand IP-8; in experiment No. 10 used transformer oil.
5. Solution No. 16 after phase inversion was additionally treated with 0.1% Reoxan m. B; Solution No. 17 after phase inversion was additionally treated with 0.1% Reocel M.V.
6. In experiment No. 11, the emulsifier Neonol AF _9-12 (HLB = 14) and Burflub-BT were used; in experiments nos. 12-14, a mixture of emulsifiers Neonol AF _9-12 and Neonol AF _9-4 (HLB = 11 and Burflub-BT (the proportion of hydroxyl groups 25%); in experiments nos. 15 and 16, the emulsifier Sinoxol m. (HLB = 14) and Flotoreagent T-92 (the share of hydroxyl groups 36%); in experiment No. 17 - a mixture of emulsifiers Neonol AF _9-12 and Neonol AF _9-4 (HLB = 12.5) and DSNB-BS (the proportion of hydroxyl groups 15%).

Table 7 Indicators of the properties of a reversible-invertible drilling fluid according to the proposed method and the known mud of the prototype Composition No. from table No. 6 Solution Properties ρ, kg / m ³ F _{0.7 MPa} , cm ³ MPa · s ₀ , dPa Gel _{10s / 10 min} , dPa US Ohm · m ES, in Sludge erosion,% Coef. friction one 1140 3.3 twenty 144 35.8 / 56.2 0.12 2 3.3 0.115 2 1138 5,0 24 163.2 23 / 25.5 0.08 2 3.3 0.155 3 1285 5.5 57 268 43,4 / 46 0.05 2 3.0 0.180 four 1280 5,078.5 17 60 - - 2 6.8 0.210 5 1067 0.6 44.5 141.6 33.2 / 38.3 > 10 69 0 0,101 6 1051 0.8 68 192.8 30.7 / 33.2 > 10 77 0 0.103 7 1068 0.5 64 187.2 25.5 / 28.1 > 10 75 0 0.103 8 1175 0.5 81.8 201,2 48.5 / 48.5 > 10 51 0 0,098 9 1240 0 61 196.8 33.2 / 38.3 > 10 33 0 0.102 10 1270 0 62 158.4 33.2 / 35.8 > 10 42 0 0,099 eleven 1058 1.3 28 178.6 35.8 / 38.3 0.13 2 0.5 0,101 12 1049 1,1 44 196.4 30.7 / 30.7 0.12 2 1,5 0.108 13 1065 0.8 35 178.6 25.5 / 28.1 0.08 2 1,2 0.103 fourteen 1167 0.7 65 244.2 56.2 / 61.3 0,075 2 1,5 0.11 fifteen 1238 0.6 86.5 357.6 71.5 / 81.8 0.45 2 1,5 0.13 16 1178 1.8 48 178.6 28.1 / 30.7 0.18 2 1,5 0.13 17 1182 2,4 53 180 28.1 / 30.7 0,042 2 2 0.128 Notes: * - filtration rate at 0.1 MPa;
ρ is the density of the solution;
F _0.7MPa - a filtration rate at 0.7MPa;
η is the plastic viscosity;
τ ₀ - dynamic shear stress;
Gel _{10s / 10min} - gel strength measured after 10s and 10min of rest;
US - specific resistance;
ES - electrical stability.

Claims (27)

1. A method of constructing horizontal wells in the intervals of unstable deposits, including sinking of a vertical section, a section of initial curvature with a set of zenith angle, sections of a set of zenith angle with horizontal access and drilling of a horizontal wellbore, using technological methods for drilling and drilling in unstable deposits, characterized the fact that the sinking of the vertical section and sections with a set of zenith angle up to 70 ° are carried out using a polymer-emulsion drilling fluid based on water ve - BRVO, and the drilling of sections with zenith angles of more than 70 ° and the drilling of a horizontal wellbore, represented by both stable - carbonate and unstable - terrigenous rocks, are carried out using a hydrocarbon-based drilling fluid - BROU, part of which is in the volume of an open drilled hole , when the design depth is reached, they are replaced by phase inversion on the BRVO, which is pumped along the wellbore, and the technological methods are used to transfer the BRVO to the BRVO and back to the BRVO by the phase inversion method directly during the drilling process, in this case, the BRVO is converted into the BRUO by mixing the BRVO with the inverter A to obtain an inverse emulsion, which is a mixture of a hydrocarbon liquid with an inverse emulsion emulsifier, the active principle of which is a nonionic surfactant based on polyglycol fatty acid esters or alcohols with a hydrophilic-lipophilic balance of not more than 10, with a volume ratio of hydrocarbon liquid: the specified emulsifier as (14 ÷ 19): 1, respectively, and invert And they are added to the BRVO in a volumetric amount of 28-35 vol.%, And the subsequent transfer of the obtained BRUO to the BRVO is carried out by adding an inverter B to it to obtain a direct emulsion, which is a mixture of a direct emulsion emulsifier, the active principle of which is nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of 11-14, with dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, with a volume ratio of the indicated emu gator direct emulsion: these alcohols like dioxane (2 ÷ 3,5): 1, respectively, with inverter B is added to the OBM in volumetric quantities of 1,75-4.%. 2. The method according to claim 1, characterized in that as BRVO use a low-clay drilling mud with a clay content of not more than 5% or non-clay drilling mud. 3. The method according to claim 1 or claim 2, characterized in that the polymer-emulsion drilling fluid comprising a polymer, an alkaline surface-active emulsifier-stabilizer of direct emulsion, a hydrocarbon phase and saline water is used as BRVO. 4. The method according to claim 1, characterized in that the inverter A is a hydrocarbon liquid contains mineral oils or esters of vegetable oils, or diesel fuel. 5. The method according to claim 1, characterized in that inverter A is an invert emulsion as an emulsifier includes Neonol AF_9-4 or Sinoxolum M. A, or Aminadet N. 6. The method according to claim 1, characterized in that as an emulsifier of direct emulsion, the active active principle of which is nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance 11-14, use Neonol AF _{9- 12} or a mixture of Neonol AF _9-4 and Neonol AF _9-12 in a volume ratio of 1 ÷ 0.7-9, or Synoxolum m. B. 7. The method according to claim 1, characterized in that, as dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, use Flotoreagent-oxal T-92 or Burflyub-BT, or DSPB-BS. 8. A method of constructing horizontal wells in the intervals of unstable deposits, including sinking of a vertical section, a section of initial curvature with a set of zenith angle, sections of a set of zenith angle with horizontal access and drilling of a horizontal wellbore, using technological methods for sinking and drilling in unstable deposits, characterized the fact that the sinking of the vertical section, sections with a set of zenith angle up to 70 °, as well as the drilling of a horizontal shaft represented by stable carbonate rocks using water-based polymer-emulsion drilling mud - BRVO, and sections in the overhead interval with zenith angles of more than 70 ° are drilled using a hydrocarbon-based drilling mud - BRUO, and after reaching the design depth of the horizontal stem, the BRVO is pumped along the wellbore, and as technological methods, the method of converting BRVO to BROW and back to BRVO by the phase inversion method directly during drilling is used, while transferring BRVO to BROU They are filled by mixing BRVO with inverter A to obtain an inverse emulsion, which is a mixture of a hydrocarbon liquid with an inverse emulsion emulsifier, whose active principle is a nonionic surfactant based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of not more than 10, at the volume ratio of hydrocarbon liquid: the specified emulsifier as (14 ÷ 19): 1, respectively, and the inverter A is added to the BRVO in a volume quantity of 28-35 vol.%, and the subsequent water obtained BROW in BRWO is carried out by adding an inverter B to it to obtain a direct emulsion, which is a mixture of a direct emulsion emulsifier, the active principle of which is nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of 11-14 , with dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, with a volume ratio of the specified emulsion emulsifier direct emulsion: the specified dioxane alcohols as (2 ÷ 3,5): 1 accordingly, the inverter B is added to BROW in a volume quantity of 1.75-4 vol.%. 9. The method according to p. 8, characterized in that as BRVO use a low clay drilling mud with a clay content of not more than 5% or non-clay drilling mud. 10. The method according to p. 8 or p. 9, characterized in that as the BRVO use a polymer-emulsion drilling fluid comprising a polymer, an alkaline surface-active emulsifier-stabilizer direct emulsion, a hydrocarbon phase and saline water. 11. The method according to p. 8, characterized in that as a hydrocarbon liquid inverter A contains mineral oils or esters of vegetable oils, or diesel fuel. 12. The method according to claim 8, characterized in that the inverter A is an emulsifier of a reverse emulsion includes Neonol AF_9-4 or Sinoxolum M. A, or Aminadet N. 13. A method according to claim 8, characterized in that as emulsifier a direct emulsion, an active th active principles are nonionic surfactants based on fatty acid polyglycol esters or alcohols with a hydrophilic-lipophilic balance of 11-14, is used Neonol AF _9-12 or a mixture of Neonol AF _9-4 and Neonol AF _9-12 in a volume ratio of 1 ÷ 0.7-9, or Synoxolum m. V. 14. The method according to p. 8, characterized in that as dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, use Flotoreagent-oxal T-92 or Burflyub-BT, or DSPB-BS.
the inverter A to obtain the inverse emulsion is added to the BRVO in a volume of 28-35 vol.%, and the subsequent transfer of the obtained IER to the water-based drilling mud is carried out by adding inverter B to it to obtain a direct emulsion, which is a mixture of a direct emulsion emulsifier, active the active principle of which are nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of 11-14, with dioxane alcohols with a mass fraction of hydrox ile groups within 15-36%, with a volume ratio of the specified emulsion emulsifier direct emulsion: the specified dioxane alcohols as (2 ÷ 3,5): 1, respectively, while the inverter B to obtain direct emulsion is added to the ESI in a volume quantity of 1.75 4 vol.%. 2. The method according to claim 1, characterized in that as a polymer-emulsion drilling fluid based on water use a clayey drilling mud with a clay content of not more than 5% or clayless drilling mud. 3. The method according to claim 1 or claim 2, characterized in that the polymer-emulsion drilling fluid comprising a polymer, an alkaline surface-active emulsifier-stabilizer direct emulsion, a hydrocarbon phase and saline water is used as a water-based drilling fluid. 4. The method according to claim 1, characterized in that, as the hydrocarbon fluid, the invert emulsion inverter contains mineral oils, or esters of vegetable oils, or diesel fuel. 5. The method according to claim 1, characterized in that, as an emulsifier of the inverse emulsion, the invert of the inverse emulsion includes Neonol AF _9-4 , or Sinoxol m. A, or Aminadet N. 6. The method according to claim 1, characterized in that as emulsifiers of direct emulsion, the active active principle of which are nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance 11-14, use Neonol AF _{9- 12} , or a mixture of Neonol AF _9-4 and Neonol AF _9-12 in a volume ratio of 1 ÷ 0.7-9 to regulate HLB, or Synoxolum m. V. 7. The method according to claim 1, characterized in that, as dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, use Flotoreagent-oxal T-92, or Burflyub-BT, or DSPB-BS. 8. A method of constructing horizontal wells in the intervals of unstable deposits, including sinking of a vertical section, a section of initial curvature with a set of zenith angle, sections of a set of zenith angle with horizontal access and drilling of a horizontal wellbore, using technological methods for sinking and drilling in unstable deposits, characterized the fact that the sinking of the vertical section, sections with a set of zenith angle up to 70 °, as well as the drilling of a horizontal shaft represented by stable carbonate rocks using water-based polymer-emulsion drilling mud, and sections in the superproductive interval with zenith angles greater than 70 ° are drilled using hydrocarbon-based drilling mud, and after reaching the design depth of the horizontal well, the water-based drilling mud is pumped along the wellbore for the purpose of hydrophilization of the filter cake, moreover, the method of transferring polymer-emulsion drilling mud to an aqueous base is used as technological methods ve in the hydrocarbon-based drilling mud and back into the water-based drilling mud by the phase inversion method directly during the drilling process, while the transfer of polymer-emulsion drilling fluid based on water-based BRVO into the hydrocarbon-based drilling mud IER is performed by mixing BRVO with inverter A for method of obtaining a reverse emulsion, which is a mixture of a hydrocarbon liquid with a reverse emulsion emulsifier, the active active principle of which is a nonionic surfactant based on f polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of not more than 10, with a volume ratio of hydrocarbon liquid: the specified emulsifier as (14 ÷ 19): 1, respectively, with inverter A being added to the BRVO in a volume quantity of 28-35 vol.%, and the subsequent transfer of the obtained IER to the water-based drilling fluid is carried out by adding an inverter B to it to obtain a direct emulsion, which is a mixture of a direct emulsion emulsifier, the active principle of which are nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance of 11-14, with dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, with a volume ratio of the indicated emulsifier direct emulsion: these dioxane alcohols as (2 ÷ 3,5): 1, respectively, while the inverter B is added to the ESI in a volume quantity of 1.75-4 vol.% To obtain a direct emulsion. 9. The method according to claim 8, characterized in that as a polymer-based emulsion drilling fluid based on water, a clayey drilling mud with a clay content of not more than 5% or clayless drilling mud is used. 10. The method according to claim 8 or claim 9, characterized in that the polymer-emulsion drilling fluid comprising a polymer, an alkaline surface-active direct emulsion stabilizing emulsifier-stabilizer, a hydrocarbon phase and mineralized water is used as a water-based drilling fluid. 11. The method according to claim 1, characterized in that, as the hydrocarbon liquid, the invert emulsion inverter contains mineral oils, or esters of vegetable oils, or diesel fuel. 12. The method according to claim 1, characterized in that, as an emulsifier of the inverse emulsion, the invert of the inverse emulsion includes Neonol AF _9-4 , or Sinoxol m. A, or Aminadet N. 13. The method according to claim 1, characterized in that as emulsifiers of direct emulsion, the active active principle of which are nonionic surfactants based on polyglycol ethers of fatty acids or alcohols with a hydrophilic-lipophilic balance 11-14, use Neonol AF _{9- 12} or a mixture of Neonol AF _9-4 and Neonol AF _9-12 in a volume ratio of 1 ÷ 0.7-9 to regulate HLB, or Synoxolum m. V. 14. The method according to claim 1, characterized in that, as dioxane alcohols with a mass fraction of hydroxyl groups in the range of 15-36%, use Flotoreagent-oxal T-92, or Burflyub-BT, or DSPB-BS.