RU2164598C2 - Compound for insulation of inflow of stratal water - Google Patents

Abstract

FIELD: oil and gas industry. SUBSTANCE: compound for insulation of inflow of stratal water has sodium silicate, calcium chloride, poorly soluble surface-active substance, hydrocarbon fluid and water. Waste product of lanolin production treated with triethanolamine with following proportion of ingredients, per cent by mass: sodium silicate 10.8-12.4; calcium chloride 10.5-12.6; waste product of lanolin production treated with triethanolamine 10.0-18.0; hydrocarbon fluid 15.0-24.0; water being the balance, is used as poorly soluble surface-active substance. Parts-by-mass proportion of sodium silicate and calcium chloride is 1.0:0.87-1.14, parts-by-mass proportion of sodium silicate and waste product of lanolin production is 1.0: 0.89-1.55. EFFECT: increased efficiency of operations for insulation thanks to raised stability of insulation screen contacting solutions of alkalis and acids, reduced permeability of water- saturated collectors. 1 tbl

Description

 The invention relates to the oil and gas industry, in particular to compositions for isolating formation water.

 Analysis of the current level of technology showed the following.

A known composition for isolating the influx of formation water, containing the following ingredients, parts by weight:
Hydrocarbon liquid - 100.0
A solution of calcium chloride with a density of 1.2 - 1.3 g / cm ³ - 10.0 - 25.0
Caustic soda with a density of 1.2 - 1.3 g / cm ³ - 0.5 - 1.5
10% solution of synthetic fatty acids in gasoline - 12.0 - 17.0
The product of processing the bottom residue of the waste from the production of tetraethoxysiloxane - 39.0 - 50.0
(see ac N 1459305 from 09.19.85 according to class E 21 B 43/22, publ. in OB N 28, 1996).

 The disadvantage of this composition is the inefficiency of isolation of the influx of formation water due to the low strength of the insulating screen. This is due to the fact that as a result of the interaction of the reagents, calcium soaps of synthetic fatty acids are obtained that do not have significant astringent properties and do not form a solid conglomerate with the formation rock.

The reaction in this composition occurs according to the scheme.
CaCl ₂ + 2NaOH ---> Ca (OH) ₂ + 2NaCl
Synthetic Fatty Acid Reacts with Calcium Hydroxide to Form Calcium Soap
R-COOH + Ca (OH) ₂ ---> (R-COO) ₂ Ca + H ₂ O.

 Calcium soap is a water-poorly soluble plastic product that clings the pores, but does not increase the strength of the insulating screen. The product of processing the bottom residue of the tetraethoxysiloxane production waste is a hydrophobizing agent and practically does not participate in the formation of the strength structure of the isolated section of the formation. The composition does not provide high-quality isolation of the reservoir and due to the fragility of the insulating screen, because the products resulting from the reaction are plastic and will be squeezed out of the screen at a certain pressure drop. It is not possible to investigate the stability of the insulating screen in contact with alkali and acid solutions due to low strength characteristics.

As a prototype, the composition specified in the method for isolating the influx of formation water (recalculation was carried out by the authors) containing the following ingredients, wt.%:
Sodium Silicate - 4.88
Calcium Chloride - 4.88
Emultal - 2.44
Oil - 48.78
Water - 39.02
(see RF patent N 2101486 of 11/27/96 under class E 21 B 43/32, published in OB N 1, 1998).

 The disadvantage of this composition is the low efficiency of isolation of formation water inflow due to the increased permeability of the insulating screen due to the high content of inert liquid phase with respect to sediment-forming components. These liquids after the decay of the emulsion are squeezed into the pore space, forming interconnected channels for the formation water. For the same reason, the composition is ineffective for isolating water inflow in the presence of highly permeable reservoirs in the well. The insulating screen has a low strength of 1.06 MPa due to the fact that the sediments obtained after the reaction of the initial components have a loose, non-cemented shape and can subsequently be eroded by water filtered through the formation. In addition, the composition does not have the necessary resistance to alkaline and acid aggression (see example 20 of the table at the end of the description).

The technical result that can be obtained by implementing the invention is reduced to the following:
the efficiency of work on isolating the influx of formation water into the well is increased by increasing the stability of the insulating screen in contact with alkali and acid solutions; reducing the permeability of water-saturated reservoirs; increase the strength characteristics of the insulating screen.

The technical result is achieved using a known composition containing sodium silicate, calcium chloride, an oil-soluble surfactant, a hydrocarbon liquid and water, in which a triethanolamine-treated waste lanolin (OPLOT) is used as the oil-soluble surfactant in the following ratio of ingredients, wt.%:
Sodium Silicate - 10.8 - 12.4
Calcium Chloride - 10.5 - 12.6
OPLOT - 10 - 18
Hydrocarbon Liquid - 15-24
Water - Else
and the ratio of wt. including between sodium silicate and calcium chloride is 1: 0.87 to 1.14, respectively, the ratio of wt.h. between sodium silicate and OPLOT is 1: 0.89 - 1.55, respectively.

Sodium silicate is used in accordance with GOST 13078-81 in the form of liquid sodium glass with a density of 1,400 g / cm ³ (which corresponds to a 40% aqueous solution), manufactured by JSC "Spectrum Plant" in Pyatigorsk, calcium chloride - in accordance with GOST 4460-87, diesel fuel, gas condensate - according to GOST 305-82, waste of lanolin production treated with triethanolamine (OPLOT) - according to TU 10-191-032-01-86. The waste from the production of lanolin is formed at the stage of wool cleaning with organic solvents and is a mixture of high molecular weight carboxylic acids with a hydrocarbon chain length of C10-C20. When processing the waste from the production of lanolin with triethanolamine in a ratio of 4: 1 at a temperature of 120 ^o C get used OPLOT.

 In a flooded formation, an aqueous solution of sodium silicate is cured by an aqueous solution of calcium chloride with the formation of a thick gel and glassy calcium silicate in the pore space.

The liquid glass used to isolate water inflow is cured by calcium chloride according to the scheme
Na ₂ SiO ₃ + CaCl ₂ + H ₂ O ---> 2NaCl + CaO · SiO ₂ · nH ₂ O.

Water glass is used as an aqueous solution of a certain density. Therefore, concentrated liquid glass interacts with water as follows
Na ₂ O mSiO ₂ + nH ₂ O ---> NaOH + mSiO ₂ (n - 1) H ₂ O
The resulting silica gel interacts according to the following formula
Si (OH) ₄ + CaCl ₂ + H ₂ O ---> CaO · SiO ₂ · nH ₂ O + HCl.

The liberated hydrochloric acid is a catalyst for the hardening of CaO · SiO ₂ · nH ₂ O. This provides a quick set of strength of the isolated area.

During the interaction of the isolated area with concentrated alkalis (30% NaOH), this reaction shifts to the left with the formation of silica gel Si (OH) ₄ and Ca (OH) ₂ , which can be washed out with formation water, thereby violating the isolation.

 Water, which is part of the initial solutions, is squeezed from the solid skeleton and forms interconnected small pores. If an alkali solution enters these pores from the well, then silicic acid will be washed out of the insulating screen and the insulation will be broken.

To prevent this, the composition contains OPLOT, which interacts with calcium chloride with the formation of water-insoluble calcium soaps having a high viscosity according to the formula
RCON (C ₂ H ₄ OH) ₂ + CaCl ₂ · 2H ₂ O ---> RCONCa + 2C ₂ H ₅ Cl + 2H ₂ O
where R is the OPLOT radical.

 These formations completely clog the pore space of the reservoir, reducing its permeability to zero even with significant pressure drops of 5.0-7.0 MPa.

When interacting with NaOH, calcium soaps are not destroyed. When interacting with acids, calcium soaps are reduced to fatty acids - hydrophobic, water-insoluble
RCONCa + 2HCl ---> RCOOH + CaCl ₂ + NH ₄
Due to this, the insulating screen will not be destroyed by either alkali solutions or acids. Moreover, almost zero permeability of the insulating screen does not allow alkaline solutions to penetrate into the reservoir.

где K₁ - проницаемость экрана до обработки модели пласта агрессивной средой;
K₂ - проницаемость экрана после обработки модели пласта агрессивной средой.The criterion for assessing the stability of the resulting screen to the action of acids and alkalis is the proportionality coefficient between the values of gas and water permeability, compressive strength before treatment with an aggressive environment and after. As aggressive components, a 20% HCl solution and a 30% NaOH solution were used. Samples were aged 2 hours and retested. The insulation efficiency coefficient K _{e is} calculated by the formula

where K ₁ is the permeability of the screen before processing the reservoir model with an aggressive medium;
K ₂ - the permeability of the screen after processing the reservoir model with an aggressive environment.

The greater the value of K _e , the less stable the insulating screen in contact with solutions of acids and alkalis. K _{e is} also calculated by strength, the greater the K _e value, the higher the strength of the insulating screen.

 The content of sodium silicate in an amount of less than 10.8 wt.%, Calcium chloride in an amount of less than 10.5 wt.%, Taken in the ratio of wt.h. less than 1: 0.87, respectively, does not fully cure sodium silicate, which negatively affects the strength, insulation characteristics of the screen.

 The content in the composition of sodium silicate in an amount of more than 12.4 wt.%, Calcium chloride more than 12.6 wt.%, Taken in the ratio of wt.h. more than 1: 1.14, impractical, because Improving the composition does not occur.

 The content of OPLOT in the composition in an amount of less than 10 wt.%, Taken in the ratio of wt.h. to sodium silicate less than 0.89: 1, respectively, adversely affects the stability of the insulating screen in contact with alkali and acid solutions.

 The content of OPLOT in the composition in an amount of more than 18 wt.%, Taken in the ratio of wt. hours to sodium silicate more than 1.55: 1, respectively, is impractical, because indicators do not improve.

It is known to use OPLOT for the preparation of emulsion cutting fluids in the processing of metals by pressure, as well as anti-corrosion additives to them (see TU 10-191-032-01-86) as part of a hydrophobic emulsion for treating a carbonate formation in order to increase the dissolving ability and stability at 100-120 ^o C (see and.with. N 1647202 from 05.19.89, CL E 21 B 43/27, publ. in OB N 17, 1991), in emulsion compositions for processing wells in order to increase the density of the composition while maintaining technological parameters at temperatures up to 100 ^o C (see A.S.NN 1808858, 1808859 dated 12.19.90, class C 09 K 7/06, published in OB N 14, 1993), in a complex reagent for the treatment of cement slurries in order to increase the thixotropy of cement slurry at at the same time reducing its water loss (see RF patent N 2013524 of 06.25.91, class E 21 B 33/138, publ. in OB N 10, 1994).

 Thus, the use of OPLOT according to the claimed technical result in the compositions for isolating the influx of formation water has not been identified by known sources.

 The inventive composition has an inventive step.

 In more detail, the essence of the claimed invention is described by the following examples.

 Example 1

To prepare 200 g of the insulation composition is mixed:
58 g of a 40% sodium silicate solution with a density of 1,400 g / cm ³ , which is 41.4 ml (containing 23.2 g (11.6 wt.%) Of sodium silicate and 34.8 ml of water (17.4 wt. %));
70 g of a 30% solution of calcium chloride with a density of 1.281 g / cm ³ , which is 54.6 ml (containing 21 g (10.5 wt.%) Calcium chloride and 49 ml of water (24.5 wt.%));
36 g (18 wt.%) OPLOT in 36 g (18 wt.%) Diesel fuel with a density of 0.825 g / cm ³ , which is 43.6 ml.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 0.91, respectively, the ratio of parts by weight between sodium silicate and OPLOT is 1: 1.55, respectively.

All components of the solution are pumped into liners 25x120 mm in size, filled with medium-sized sand (particle size modulus 1.96, density 2679 kg / m ³ , bulk density 1564 kg / m ³ ). After two days of hardening, tests are carried out.

Characteristics of the obtained insulating screen: water permeability K _1B = 3.21 · 10 ^-4 μm ² , gas permeability K _1Г = 4.56 · 10 ^-3 μm ² , compressive strength K _1R = 5.46 MPa. After creating an insulating screen, a 20% HCl solution is pumped into the reservoir model, and left alone for 2 hours. After time, determine the permeability, gas permeability, compressive strength after processing, and the stability of the insulating screen (insulation efficiency coefficients) to the action of acid is judged by the ratio of these values to their values before treatment with acid.

 They also judge the stability of the insulating shield to the action of a 30% NaOH solution.

Characteristics of the insulating screen: after treatment with a 20% HCl solution, water permeability K _2B = 3.27 · 10 ^-4 μm ² , gas permeability K _2Г = 4.70 · 10 ^-3 μm ² , compressive strength K _2R = 4.86 MPa , insulation efficiency factors: for water K _ЭГHCl = 1.02, for gas K _ЭГHCl = 1.03, for strength K _ЭRHCl = 0.89,
after treatment with a 30% NaOH solution, water permeability K ' _2B = 3.21 · 10 ^-4 μm ² , gas permeability K' _2Г = 4.61 · 10 ^-3 μm ^-3 , compressive strength K ' _2R = 4.97 MPa . The insulation efficiency coefficients for water K _ЭВNaOH = 1.00, for gas K _ЭГNaOH = 1.01, for strength K _ЭРNaOH = 0.91.

In field conditions, the volume of insulating material for repair work on the well is determined by the formula
V = 0.785 (D ² -d ² ) hmK _s
where D is the diameter of the insulation zone, m;
d is the outer diameter of the production casing, m;
h is the thickness of the isolated interval, m;
m is the average open relative porosity of the reservoir;
K _s - fill factor of the pore space of the isolated interval.

For the wells of the Vyngapurovsky gas field of the Noyabrsky UTTG:
d = 0.168 m; perforation interval 1189 - 1225 m; the water-cut perforation interval is
h = 1225 - 1218 = 7 m,
where 1218 m is the level of gas-water contact (GVK).

 The diameter of the insulation zone D = 1.5 m.

 The average open (through) porosity of the isolated interval m = 0.26.

The pore fill factor K _s = 0.44.

Consequently,
V = 0.785 (1.5 ² - 0.168 ² ) 7 0.26 0.44 = 1.4 m ³
To prepare a 1.4 m ³ solution, you must use:
A solution of liquid sodium glass in an amount of 0.315 m ³ (29 wt.%). The density of water glass (solution of sodium silicate) is 1,400 g / cm ³ .

An aqueous 30% solution of calcium chloride with a density of 1.281 g / cm ³ in a volume of 0.4158 m ³ (35 wt.%). The solution is prepared as follows: 159.8 kg (10.5 wt.%) Of calcium chloride are dissolved in 372.8 l of water.

A 50% solution of OPLOT in diesel fuel is prepared in the following order: 300.3 kg (18 wt%) of OPLOT are added to diesel fuel with a density of 0.825 g / cm ³ and a volume of 0.3318 m ³ (18 wt.%), After wherein the composition is stirred until the latter is completely dissolved.

The pumping of technological fluids into the well is carried out using a cementing unit ЦА-320М in the 2nd or 3rd gear (sleeve diameter 100 mm). Total injection time for all process fluids:
T = V / Q _i ,
where Q _i - the performance of the CA-320M unit for a given transmission, m ³ / s;
V is the volume of all components pumped into the well.

 In 2nd gear unit: T = 1.4 / 0.003 = 7.8 min.

 With 3rd gear unit: T = 1.4 / 0.0058 = 4.02 min.

 Example 2

Prepare 200 g of the insulating composition in the following ratio of ingredients, wt.% / G:
sodium silicate 10.8 / 21.6 (which is 38.6 ml of a 40% solution of sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 12.3 / 24.6 (which is 64.0 ml of a 30% solution of calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 16/32;
diesel fuel 16/32 (which is 38.8 ml ρ = 0.825 g / cm ³ );
water 44.9 / 89.8.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 1.14, respectively, the ratio of parts by weight between sodium silicate and OPLO is 1: 1.48, respectively. All operations are carried out as described in example 1.

Characteristics of the obtained insulating screen: K _1B = 0, K _1G = 0, K _1R = 8.11 MPa;
after treatment with a 20% HCl solution, K _2B = 0, K _2G = 0, K _2R = 7.79 MPa.

Coefficients of insulation efficiency: K _EHHCl = 1.00, K _EHHCl = 1.00, K _EHHCl = 0.96;
after treatment with a 30% NaOH solution: K ' _2B = 0, K' _2G = 0, K ' _2R = 8.03 MPa.

Insulation efficiency factors: K _ЭВNaOH = 1.00, K _ЭГNaOH = 1.00, K _ЭРNaOH = 0.99
Example 3

Prepare 200 g of the insulating composition in the following ratio of ingredients, wt.% / G:
sodium silicate 12.4 / 24.8 (which is 44.3 ml of a solution of 40% sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 11.1 / 22.2 (which is 57.8 ml of a 30% solution of calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 16/32;
gas condensate 16/32 (which is 43.1 ml ρ = 0.743 g / cm ³ );
water 44.5 / 89.0.

The ratio of parts by weight between sodium silicate and calcium chloride is 1: 0.90, respectively, the ratio between sodium silicate and OPLOT is 1: 1.29, respectively. All operations are carried out as described in Example 1. Characteristics of the obtained insulating screen: K _1B = 2.25 · 10 ^-4 μm ² , K _1Г = 6.81 · 10 ^-3 μm ² , K _1R = 5.29 MPa;
after treatment with a 20% solution of HCl, K _2B = 2.30 · 10 ^-4 μm ² , K _2Г = 6.95 · 10 ^-3 μm ² , K _2R = 4.60 MPa.

Coefficients of insulation efficiency: K _EHHCl = 1.02, K _EHHCl = 1.02, K _EHHCl = 0.87;
after treatment with a 30% NaOH solution, K ' _2B = 2.25 · 10 ^-4 μm ² , K' _2Г = 6.81 · 10 ^-3 μm ² , K ' _2R = 4.97 MPa.

Coefficients of insulation efficiency: K _ЭВNaOH = 1.00, K _ЭГNaOH = 1.00, K _ЭРNaOH = 0.94.

 Example 4

Prepare 200 g of the insulating composition in the following ratio of ingredients, wt.% / G:
sodium silicate 11.2 / 22.4 (which is 40.0 ml of 40% p-pa sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 12.6 / 25.2 (which is 65.6 ml of 30% p-pa calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 15/30;
gas condensate 15/30 (which is 40.4 ml ρ = 0.743 g / cm ³ );
water 46.2 / 92.4.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 1.13, respectively, the ratio of parts by weight between sodium silicate and OPLOT is 1: 1.34, respectively. All operations are carried out as in example 1.

Characteristics of the resulting insulating screen:
K _1B = 6.25 · 10 ^-5 μm ² , K _1Г = 3.26 · 10 ^-4 μm ² , K _1R = 6.78 MPa;
after treatment with a 20% HCl solution, K _2B = 6.25 · 10 ^-5 μm ² , K _2Г = 3.26 · 10 ^-4 μm ² , K _2R = 6.31 MPa.

Coefficients of insulation efficiency: K _EHHCl = 1.00, K _EHHCl = 1.00, K _EHHCl = 0.93;
after treatment with a 30% NaOH solution, K ' _2B = 6.25 · 10 ^-5 μm ² , K' _2Г = 3.26 · 10 ^-4 μm ² K ' _2R = 6.44 MPa.

Insulation efficiency factors: K _ЭВNaOH = 1.00, K _ЭГNaOH = 1.00, K _ЭРNaOH = 0.95.

 Example 5

Prepare 200 g of the insulating composition in the following ratio of ingredients, wt.% / G:
sodium silicate 11.6 / 23.2 (which is 41.4 ml of 40% p-pa sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 10.5 / 21.0 (which is 54.6 ml of 30% p-pa calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 12/24;
24/48 diesel fuel (which is 58.2 ml ρ = 0.825 g / cm ³ );
water 41.9 / 83.8.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 0.91, respectively, the ratio of parts by weight between sodium silicate and OPLOT is 1: 1.03, respectively. Perform all operations, as in example 1.

Characteristics of the resulting insulating screen:
K _1B = 4.25 · 10 ^-3 μm ² , K _1Г = 1.51 · 10 ^-2 μm ² , K _1R = 4.26 MPa;
after treatment with a 20% HCl solution, K _2B = 4.29 · 10 ^-3 μm ² , K _2Г = 1.54 · 10 ^-2 μm ² , K _2R = 3.96 MPa.

Coefficients of insulation efficiency: K _EHHCl = 1.01, K _EHHCl = 1.02, K _EHHCl = 0.93;
after treatment with a 30% NaOH solution, K ' _2B = 4.34 · 10 ^-3 microns ² , K' _2Г = 1.57 · 10 ^-2 microns ² , K ' _2R = 4.00 MPa.

Coefficients of insulation efficiency: K _ЭВNaOH = 1,02, K _ЭГNaOH = 1,04, K _ЭРNaOH = 0,94.

 Example 6

Prepare 200 g of the insulating composition in the following ratio of ingredients, wt.% / G:
sodium silicate 10.8 / 21.6 (which is 38.6 ml of a 40% solution of sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 12.3 / 24.6 (which is 64.0 ml of a 30% solution of calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 11/22;
diesel fuel 21/42 (which is 50.9 ml ρ = 825 g / cm ³ );
water 44.9 / 89.8.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 1.14, respectively, the ratio of parts by weight between sodium silicate and OPLO is 1: 1.02, respectively. Perform all operations, as in example 1.

Characteristics of the obtained insulating screen: K _1B = 2.21 · 10 ^-3 μm ² , K _1Г = 3.41 · 10 ^-2 μm ² , K _1R = 4.88 MPa;
after processing with a 20% HCl solution, K _2B = 2.25 · 10 ^-3 μm ² , K _2Г = 3.48 · 10 ^-2 μm ² , K _2R = 4.49 MPa.

Coefficients of insulation efficiency: K _EHHCl = 1.02, K _EHHCl = 1.02, K _EHHCl = 0.92;
after treatment with a 30% NaOH solution, K ' _2B = 2.23 · 10 ^-3 μm ² , K' _2Г = 3.48 · 10 ^-2 μm ² , K ' _2R = 4.64 MPa.

Coefficients of insulation efficiency: K _EVNaOH = 1.01, K _EGNaOH = 1.02, K _ERNaOH = 0.95.

 Example 7

Prepare 200 g of the insulating composition in the following ratio of ingredients wt.% / G:
sodium silicate 12.4 / 24.8 (which is 44.3 ml of a 40% solution of sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 10.8 / 21.6 (which is 56.2 ml of a 30% solution of calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 11/22;
gas condensate 22/44 (which is 59.2 ml ρ = 0.743 g / cm ³ );
water 43.8 / 87.6.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 0.87, respectively, the ratio of parts by weight between sodium silicate and OPLOT is 1: 0.89, respectively. Perform all operations, as in example 1.

Characteristics of the obtained insulating screen: K _1B = 4.11 · 10 ^-3 μm ² , K _1Г = 1.62 · 10 ^-2 μm ² , K _1R = 4.37 MPa;
after treatment with a 20% HCl solution, K _2B = 4.15 · 10 ^-3 μm ² , K _2G = 1.67 · 10 ^-2 μm ² , K _2R = 3.93 MPa.

Insulation efficiency factors: K _EHHCl = 1.01, K _EHHCl = 1.03, K _EHHCl = 0.90;
after processing with a 30% NaOH solution, K ' _2B = 4.15 · 10 ^-3 μm ² , K' _2Г = 1.64 · 10 ^-2 μm ² , K ' _2R = 4.02 MPa.

Coefficients of insulation efficiency: K _EVNaOH = 1.01, K _EGNaOH = 1.01, K _ERNaOH = 0.92.

 Example 8

Prepare 200 g of the insulating composition in the following ratio of ingredients, wt.% / G:
sodium silicate 11.2 / 22.4 (which is 40.0 ml of a 40% solution of sodium silicate ρ = 1,400 g / cm ³ );
calcium chloride 12.6 / 25.2 (which is 65.6 ml of a 30% solution of calcium chloride ρ = 1.281 g / cm ³ );
OPLOT 10/20;
gas condensate 20/40 (which is 53.8 ml ρ = 0.743 g / cm ³ );
water 46.2 / 92.4.

 The ratio of parts by weight between sodium silicate and calcium chloride is 1: 1.13, respectively, the ratio of parts by weight between sodium silicate and OPLOT is 1: 0.89, respectively. Perform all operations, as in example 1.

Characteristics of the obtained insulating screen: K _1B = 8.40 · 10 ^-4 μm ² , K _1Г = 2.67 · 10 ^-3 μm ² , K _1R = 5.26 MPa;
after treatment with a 20% HCl solution, K _2B = 8.40 · 10 ^-4 μm ² , K _2Г = 2.67 · 10 ^-3 μm ² , K _2R = 4.68 MPa.

Coefficients of insulation efficiency: K _EHHCl = 1.00, K _EHHCl = 1.00, K _EHHCl = 0.89;
after treatment with a 30% NaOH solution, K ' _2B = 8.40 · 10 ^-4 μm ² , K' _2Г = 2.67 · 10 ^-3 μm ² , K ' _2R = 4.89 MPa.

Coefficients of insulation efficiency: K _ЭВNaOH = 1.00, K _ЭГNaOH = 1.00, K _ЭРNaOH = 0.93.

Compared to the prototype:
values of the obtained insulating screen: water permeability decreased by 5 times and to its complete absence; gas permeability decreased by 3 times and to its complete absence; compressive strength increased 4-8 times;
the values of the obtained insulating screen after treatment with an acid solution: water permeability decreased by 5 times and to its complete absence, gas permeability decreased by 3 times and to its complete absence, compressive strength increased by 4-9 times. Coefficients of insulation efficiency increased: K _EHHCl by 2-4%, K _EHHCl by 1-4%, K _EHHCl by 7-18.5%; values of the obtained insulating screen after treatment with alkali solution: water permeability decreased by 6 times and to its complete absence; gas permeability decreased by 4 times and to its complete absence, compressive strength increased by 7-15 times. The insulation efficiency coefficients increased: K _ЭВNaOH by 16-17%, K _ЭГNaOH by 21-24%, K _ЭRNaOH by 78-94%.

 Tests of the compositions were carried out on UKP-4 units, a prefix to the KTs-3 consistometer. Compressive strength - on press 2 PG-10. The effect of diesel fuel and gas condensate in the compositions is equivalent.

Claims (1)

Composition for isolating the influx of produced water, containing sodium silicate, calcium chloride, oil-soluble surfactant, hydrocarbon liquid and water, characterized in that it contains a waste of the production of lanolin treated with triethanolamine as an oil-soluble surfactant, in the following ratio of ingredients, wt.%:
Sodium Silicate - 10.8 - 12.4
Calcium Chloride - 10.5 - 12.6
Wastes from the production of lanolin treated with triethanolamine - 10.0 - 18.0
Hydrocarbon fluid - 15.0 - 24.0
Water - Else
moreover, the ratio of parts by weight between sodium silicate and calcium chloride is 1: 0.87 to 1.14, respectively, the ratio of parts by weight between sodium silicate and the waste from the production of lanolin treated with triethanolamine, is 1: 0.89 - 1.55, respectively.

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