Composition for insulation of water in the well

 

(57) Abstract:

The invention relates to the oil and gas industry, in particular compositions for the isolation of the water in the well. The technical result is to increase the efficiency of the insulation of the water in the well by reducing the permeability of water-saturated reservoirs, reliable and durable insulation screen with improved elastic-plastic characteristics while maintaining high strength properties and as a consequence increase the turnaround time of operation. Composition for insulation of water in the well, consisting of a polymer, an aqueous solution of sodium silicate 40% concentration, an aqueous solution of calcium chloride 30% concentration, the polymer contains polyvinyl alcohol in the following ratio of ingredients, wt.%: polyvinyl alcohol 2-4, the specified solution of sodium silicate 40-50 specified solution of calcium chloride 46-58, and the ratio of wt. hours between the specified solution of calcium chloride and polyvinyl alcohol is 1.00 : 0.03 to 0.09, respectively, between the solutions of sodium silicate and calcium chloride - 1,00 : 0,92 - 1,45 respectively.

From the well.

Analysis of the existing state of the art showed the following:

known composition for the isolation of brine containing the following ingredients, wt.%:

Sodium silicate - 6-12

Urea - 5-15

The electrolyte - 0,3-1,0

Water - the Rest

the electrolyte used is calcium chloride or hydrochloric acid (see RF patent 2067157 from 11.08.94, CL E 21 In 33/138, publ. in ABOUT 27, 1996).

The disadvantage of this structure is the low efficiency of the insulation of the water in the well. This is due to the following reasons: urea, which is included to isolate, sodium silicate does not interact chemically and is not involved in the formation of a solid insulating screen. It regulates only the gelation time.

The strength of the insulating sheet is formed only due to the chemical interaction of sodium silicate and an electrolyte (calcium chloride or hydrochloric acid). Low concentrations of these components provides robust and efficient insulation screen. This is because in the pore space of the water reservoir is structurally unrelated ("extra") water included in the composition for insulation, forming channels for considenng collectors. In addition, the vitreous hydration products of these components are very fragile and do not have the elastic-plastic properties.

This is due to the fragility of the insulation screen. The insulation can be easily broken when the deformation of the reservoir due to changes in reservoir pressure or hydrodynamic stimulation.

Low strength insulation screen, its increased fragility in the absence of a satisfactory elastic-plastic properties of the final result significantly reduces the reliability of the generated screen, which in turn leads to a decrease turnaround trouble-free operating life of producing wells;

known composition for insulation of water in the well containing the following ingredients, wt.%:

Sodium silicate - 6-8

Polyhydric alcohol - 5-10

The electrolyte - 0,4-0,8

Wood flour - 2-5

Water - the Rest

as a polyhydric alcohol contains glycerin or glycol, as the electrolyte is calcium chloride (see RF patent 2081297 from 14.04.95, CL E 21 In 33/138, publ. in ABOUT 16, 1997).

The disadvantage of this structure is the low efficiency of the isolation of water in the well. the indicated filtered on the surface of the reservoir, and the liquid phase composition before they enter the reservoir due to the presence in the composition of a polyhydric alcohol quickly coagulates. This prevents the penetration of the composition in small and medium-sized pores of the formation. Filled mostly large pores and cracks. Because of this insulation screen appears heterogeneous and discontinuous did not provide a significant reduction of the permeability of water-saturated reservoirs. In addition, penetrated to a depth into the formation of liquid phase composition forms a fragile gel and does not contribute to obtaining a durable elastic-plastic screen, which can lead to a violation of this isolation due to the pressure of the reservoir water and deformation of the reservoir. This is due to the fact that being part of the polyhydric alcohol (glycerol or ethylene glycol) with sodium silicate does not interact chemically, and calcium chloride at normal temperature forms a gel-like glycide or glycolate - unstable complex compounds, which only regulate the gelation time of the insulating composition, but do not participate in the formation of the structural strength of the insulation screen. They are easily dissolved at elevated temperature of the reservoir, from which the main strength of the insulation screen provides the ranks of the properties of the formed insulating screen and its durability;

known composition for isolating the flow of formation waters containing the following ingredients, wt.%:

The silicate of an alkali metal - 2-20

Salt of the alkali earth metal is 0.05-2

Aqueous suspension of sediment - product of the interaction of salts of alkaline earth metal of 41-30% of the total composition of the silicate of an alkali metal - Rest

as salts of the alkali earth metal is used, for example, calcium chloride or magnesium chloride (see RF patent 2118453 from 27.11.96, CL E 21 In 43/32, publ. in ABOUT 24, 1998).

The disadvantage of this structure is the lack of efficient isolation of water in the well. The reason is the following: when jacking composition in the reservoir, especially if it consists of Sandstone, the solid phase of the suspension is filtered on the surface of the layer, and the portion of the liquid phase consisting of an aqueous solution of sodium silicate and calcium chloride, is forced into the pore space of the formation.

The reaction of interaction of solutions of sodium silicate and calcium chloride is very fast, in a matter of minutes. This also contributes to the solid phase of the suspension, which is the hydration products of these components and the centers of crystallization, that is adowanie and crystallization is almost completed, the main volume of sodium silicate and calcium chloride spent on these processes and pressed into the layer of liquid phase has a low concentration of these products. After their reaction in the pores of the formation of "extra" water composition for insulation is the channel for filtering the produced water, which reduces the efficiency of the insulation.

Low strength and brittleness of the insulation screen reduce its reliability and durability;

as a prototype taken part to isolate water production in a well, comprising the following components, wt%:

Hydrolyzed in alkali waste fibers or fabrics of polyacrylonitrile (givan) - 1,0-5,0

Sodium silicate is 0.33 to 3.0

Calcium chloride - 2,0-5,0

Water - the Rest

(see RF patent 2064571 from 16.08.94, CL E 21 In 33/138, publ. in ABOUT 21, 1996).

The disadvantage of this structure is the low efficiency of the insulation of the water in the well. This is explained by the following. The composition is osadca and gelling and is mainly used for the alignment of the profile permeability of injection wells and selective isolation of water production in oil and gas wells. Precipitate in the form of calcium hydrosilicate is formed by the interaction of the ur.

When using this gel-forming composition, it is impossible to create a reliable and durable insulation screen with a high elastic-plastic and strength properties (see example 14 test report), as it is in the pore space does not form a solid and durable insulation screen, and is in a gel state. When the pore space is only partially filled with sediment, causing the insulation screen has a high permeability. This also contributes to the low concentration in the gel-forming composition of a polymer and sodium silicate.

Formed in the insulation screen, the gel can be squeezed out water from the pore space, so this screen is short-lived, which in turn leads to decrease turnaround time operation.

From table.3 (see S. 13-14 description of the patent) shows that the maximum efficiency of the best insulating properties of the gel-forming compositions, determined by the residual resistance factor (POST=K1/K2), is only 35.5-100, i.e., is too low.

Thus, a low elastic component of the deformation properties and strength characteristics of the insulating sheet, and TEI ability of the formed gels, can lead to the re-inflow of formation water, which indicates low reliability of the generated screen on the need to reduce turnaround time operating well.

The technical result that can be obtained by carrying out the present invention, is as follows:

increase the efficiency of the insulation of the water in the well by reducing the permeability of water-saturated reservoirs, reliable and durable insulation screen with improved elastic-plastic characteristics while maintaining high strength properties and as a consequence increase the turnaround time of operation.

The technical result is achieved by means of known composition to isolate water production in the well, consisting of a polymer, an aqueous solution of sodium silicate 40% concentration, an aqueous solution of calcium chloride 30% concentration, which as polymer contains polyvinyl alcohol in the following ratio of ingredients, wt.%:

Polyvinyl alcohol - 2 - 4

This solution of sodium silicate - 40 - 50

This solution of calcium chloride - 46-58

moreover, the ratio of wt. hours between ucase solutions of sodium silicate and calcium chloride - 1,00 : 0,92 of-1.45, respectively.

Polyvinyl alcohol use according to GOST 10779-78 varieties 18/11 (partially saponified). PVA 18/11 consists of grains of white color with a mass fraction of volatile substances is not more than 4%. Sodium silicate is used according to GOST 13078-81 in the form of liquid sodium glass density 1400 kg/m3(which corresponds to a water solution of 40% concentration), manufactured by CJSC "Plant Range" , Pyatigorsk. The solution is prepared autoclave and bezavtoklavnym dissolution of glassy silicates of sodium. Mass fraction of water-insoluble substances should not exceed 0.2%. Calcium chloride is used according to GOST 450-77. Mass fraction of calcium chloride in the original powder should not be less than 90%. All components included in the inventive composition for insulation, chemically interact with the formation of the insulation screen. When diluted with water, the sodium silicate to the required density prior to injection into the well, it reacts according to the following scheme

Na2OmSiO2+ H2O-->NaOH + mSi(OH)4< / BR>
Released orthographia acid reacts in a formation with calcium chloride

CaCl22H2O + Si(OH)4--> CaOSiO2nH2O + HCl

Formed hydrosilicate feces is e neutralized with NaOH education NaCl and H2O.

Simultaneously with this reaction in aqueous solution the reaction of interaction (polycondensation) of polyvinyl alcohol with orthosilicic acid according to the scheme

/CH2SNON/n+ Si(OH)4--> /Si(CH2CHO)4/m+ H2O

The degree of condensation depends on the conditions of the reaction and the speed of removal of the formed water. Therefore, the resulting cured polymer in the initial stage of curing capable of flowing, and in the hardened condition is a hard, durable elastic-plastic body.

The curing reaction of sodium silicate and polyvinyl alcohol is thermosetting, so at higher formation temperatures of the insulation screen only strengthened by increasing the degree of condensation of the reaction product and is not softened, which also ensures its durability and extends the operating temperature range of the proposed structure for isolation. Since the reaction between sodium silicate with calcium chloride and sodium silicate with polyvinyl alcohol occur in the same amount and in the same period, the products of their interaction evenly distributed in the total volume. It turns out the hardened plastindia screen high strength and water resistance.

Well the insulation screen is exposed to the static hydrodynamic forces that occur when the change in reservoir pressure and different treatments during operation of the wells, for example during injection and withdrawal of gas in UGS wells, when carrying out repair work or changing reservoir pressure at the late stage of production. To prevent destruction of the insulation screen and depressurization after curing, it is necessary that the latter possessed the elastic-plastic properties, which provide for the recovery of the original dimensions and stress relief (relaxation) after exposure to alternating loads to the reservoir. High elastic-plastic properties of the obtained insulating screen is designed to withstand deformation and hydrodynamic loads in the reservoir due to the rapid relaxation of stresses without fracture, which ensures the durability of the insulation screen, which in turn increases the turnaround time of operation.

Criteria for evaluation of elastic-plastic properties of the waterproofing of the screen taken energy plasticity indexPLthat means a relationship in which consequently

KPL=Ap/Ay,

as well as the modulus of elasticity (young's modulus), defined by the formula

< / BR>
where E is young's modulus, PA;

Ft- the load at which the voltage in the sample reaches the yield stress, N;

- Poisson's ratio;

dW- diameter cylindrical punch, introduced in the test sample, m;

y- the amount of elastic deformation, m

It should be noted that the values of the coefficient of plasticity all solids divided into 6 categories. These categories define the class of solids (rocks) on the following principle:

TOPL= 1 - breed fragile;

1 < KPL6 - breeds plastic-brittle;

TOPL> 6 - flexible and highly porous rocks.

(see A. I. Spivak, A. N. Popov. The destruction of rocks during drilling. -M.: Nedra, 1986).

In this case, when creating elastic-plastic insulating sheet with high strength characteristics of the optimal values of the coefficient of plasticity can be considered TOPL= 2-6. When the values FORPL< 2 insulation screen will collapse (the fragile) under the action of alternating loads on it. When KPL> 6 won easymanage layer, will not recover in the volume of pores after removal of the loads on the layer that will increase gas and water permeability flooded reservoir.

For the same reason, the values of modulus of elasticity (young's modulus) should not be less than 10-15 HPa, which corresponds to the 4-th category of elasticity.

The content in the composition of the polyvinyl alcohol in the amount less than 2 wt.%, taken in the ratio of wt. hours to aqueous solution of calcium chloride 30% concentration less than 0.03: 1.00, respectively, negatively affects the elastic-plastic properties of the screen.

The content in the composition of the polyvinyl alcohol in the amount of more than 4 wt.%, taken in the ratio of wt.h. to the aqueous solution of calcium chloride 30% concentration more than 0,09: 1.00, respectively, is impractical because of the improved properties does not occur.

The content in the composition of the aqueous solution of sodium silicate 40% concentration in an amount less than 40 wt.% and an aqueous solution of calcium chloride 30% concentration more than 58 wt.%, taken in the ratio of wt.h. more than 1,00:1,45 respectively, leads to deterioration of the insulation strength characteristics of the screen.

The content in the composition of the aqueous solution of sodium silicate 40% concentration in quantities of more weight.h. less than 1,00: 0,92 accordingly, does not provide complete curing of sodium silicate, which adversely affects the strength and insulating properties of the insulating barrier.

Know the use of polyvinyl alcohol:

in the way of temporary isolation of high permeability zones to simplify the way (see 881296 from 26.03.79,, publ. in ABOUT 42, 1981), with the aim of improving the quality and reliability of isolation due to uniform curing of the input agents (see and.with. 1035194 from 01.03.82,, publ. in ABOUT 30, 1983), in part to isolate the produced water, the elimination of inter-layer and cross-flows to improve efficiency and security of the isolation of the produced water, the elimination of inter-layer and cross-flows in the wells (see RF patent 2032068 from 27.07.92, CL E 21 In 33/138, publ. at ABOUT 9, 1995), in part to eliminate the annular flow of fluids in oil and gas wells with liquid glass to improve the sealing properties of the composition by increasing its adhesion and strength properties (see RF patent 2117758 from 17.12.97, CL E 21 In 43/32, publ. at ABOUT 23, 1998 ), sealing mastic to improve heat resistance, strength and elasticity (see and.with. 497327 from 20.02.75, CL 09 To 3/10, openi hardening, increase the elasticity of the seam (see and. C. 1312087 from 02.01.85, CL 09 To 3/10, 04 26/32, publ. in ABOUT 19, 1987), in the adhesive composition to improve the viability, fracture toughness, improve workability during application of the composition, reducing the cost (and see.with. 1437378 from 11.05.86, CL 09 J 1/00, 3/14// 09 D 5/34, publ. in ABOUT 42, 1988), in part for gluing cardboard introduction of polyvinyl alcohol and chalk gives glued products increased mechanical properties due to the greater strength of the adhesive film after drying (see RF patent 2106379 from 09.12.95,, publ. at ABOUT 7, 1998), in the production method of sealing materials based Thiokol to give hermetics temporary structural viscosity (see and.with. 178923 from 25.12.1964, CL 09 To 3/10, publ. at ABOUT 4, 1966), in cement mortar with the aim of increasing the sedimentation stability of the solution in terms of cementing directional wells, the permeability reduction and accelerate the growth of the strength properties of solution hardening use of polyvinyl alcohol PVA - "TR" (see A. with. 966227 from 11.03.79, CL E 21 In 33/138, publ. in ABOUT 38, 1982), mixes with the aim of increasing deformation, adhesion to building materials, hydraulic hardening and viability (Storev on the basis of Portland cement to improve the plasticizing effect and thixotropy of cement slurries reduce foaming when cooking (see RF patent 2033519 from 07.08.92,, publ. at ABOUT 11, 1995). However, the plasticizer, one component of which is polyvinyl alcohol, the effect on the target only in the liquid phase of the cement slurry and does not affect the elastic-plastic properties of the final product - cement stone. The goal in this case is achieved by increasing the surface tension and viscosity of the liquid phase of the cement slurry. Known use in dispersion-reinforced cement mortar for cementing mixture of fibrous crystals natural or synthetic minerals or metal fibers, or glass fibers or basalt fibers, polyvinyl alcohol fibers, taken in the ratio of 1:1 to 2:1, to improve the strength of cement stone in tension in the early and late time without reducing the compressive strength, fracture toughness under static and dynamic loads, increasing deformation and improve the main technological properties of cement mortar and stone in the temperature range from +20 to 200o(See and.with. 1006713 from 28.05.81, CL .E 21 In 33/138, publ. at ABOUT 11, 1983);

known use: chloride, calc In 33/138, publ. in ABOUT 46, 1980);

liquid glass in the cement paste to eliminate absorption to improve the mobility of the cement paste in the initial period and increase in the future, its plastic strength (see and.with. 1229314 from 04.07.84, CL E 21 In 33/138, publ. in ABOUT 17, 1986), in the dispersion-reinforced cement mortar for cementing oil and gas wells in order to increase the strength of cement stone tensile in the early and later stages of hardening, deformation, fracture toughness and thermoelasticity in the range of 50-250oWhen the density of the solution of 1.86 to 1.4 g/cm3(see and.with. 1055853 from 05.07.82, CL E 21 In 33/138, publ. in ABOUT 43, 1983).

Thus not detected by the available sources known technical solutions, which have characteristics that match with the distinctive features of the present invention according to the claimed technical result.

The inventive composition involves an inventive step.

In more detail the essence of the invention is described in the following examples.

Example 1

To prepare 200 grams of insulation composition is mixed 57,2 ml of an aqueous solution of sodium silicate 40% concentration ( = 1400 kg/m3), which is equivalent to 4 g of polyvinyl alcohol, that is 4 wt.%.

The ratio of wt. hours between the specified solution of calcium chloride and polyvinyl alcohol is 1.00:0,07 respectively, between the solutions of calcium chloride and sodium silicate - 1,4:1.00, respectively.

All components are pumped into the liner size h mm, filled with sand, the average particle size (fineness modulus 1,96, the density of 2680 kg/m3, bulk weight 1564 kg/m3). After two days of hardening produce tests.

Characteristics of the insulation screen: the coefficient of permeability Kin=8,9510-5μm2the coefficient of permeability Kg=1,0310-4μm2, the ratio of the permeabilities of the formation model before and after the treatment composition TO ap= 7,2104the compressive strength R=2,87 MPa, plasticity indexPL=5,2, modulus of elasticity young's modulus E=25.6 HPa.

In field conditions the volume of the insulating compound for the repair and insulation works well is determined by the formula

V=0,785(D2-d2)hmkC,

where D is the diameter of the isolation zone, m;

d - outer diameter of the production string, m;

h - power isolated interval, m;

m - medium from the alignment interval, kC0,40-0,45.

For wells 1008 deposits bear LLC Nadymgazprom":

d=0,219 m, perforation interval 1133-1173 m, current gas-water contact (DDC) 07.2001, is 1170 m, the predicted rise GVK for the next 3 years is 1167 m, the thickness of the insulated interval h=1173-1167=6 m, the diameter of the isolation zone is equal to D=2.0 m, m=0,32, kC=0,45.

Hence V=0,785(2,02-0,2192)60,320,45=2.7 m3.

For the preparation of 2,7 m3the insulating composition is used:

an aqueous solution of sodium silicate 40% concentration in an amount of 1.03 m3(40 wt%), the density of 1400 kg/m3;

an aqueous solution of calcium chloride 30% concentration in the number of 1.56 m3(56 wt. %), density 1281 kg/m3; polyvinyl alcohol in the amount of 143 kg (4 wt.%).

The injection of fluids into the borehole perform using the retainer Assembly CA-320M in 2nd or 3rd gear (diameter of the sleeves DW=100 mm). The total download time of all insulating composition

T=V/Q,

where Q is the efficiency of the machine CA-320M on the transmission, m3/s

When the 2nd transfer unit: T=2,7/0,003=900=15 minutes

When the 3rd transfer unit: T=2,7/0,0058=466=7,76 hydrated layer, is

VCR=0,785(d2tubingLtubing+d2in(Lp-Ltubing)),

where dtubing- inner diameter tubing, m;

Ltubing- the depth of the suspension tubing, m;

din- inner diameter operating casing, m;

Lp- the high-water mark of the perforation interval, m

dtubing=0,078 m, Ltubing=1129, din=0,203 m, Lp=1133 m

Therefore, VCR=0,785(0,07821129+ 0,2032(1133-1129))=5,52 m3.

Time produce insulating composition in the borehole is:

On the 2nd transfer unit: TCR=5,52/0,003=1840=30,7 minutes

On the 3rd transfer unit: TCR=5,52/0,0058=952=15,9 minutes

Example 2

Prepare 200 g of the composition, g/wt.%:

An aqueous solution of sodium silicate 40% concentration 100/50 (which accounts for 71.4 ml =1400 kg/m3).

An aqueous solution of calcium chloride 30% concentration 96/48 (which is 75,0 ml =1281 kg/m3).

Polyvinyl alcohol 4/2.

The ratio of wt. hours between the specified solution of calcium chloride and polyvinyl alcohol is 1.00:0,04 respectively, between these solutions CHL>/P>Characteristics of the insulation screen:in= 6,7110-4μm2TOg=2,3410-3μm2TOp=9,7103R=2,44 MPa, KPL=3,1, E=37,4 HPa.

Example 3

Prepare 200 g of the composition, g/wt.%:

An aqueous solution of sodium silicate 40% concentration 90/45 (which is 64,2 ml =1400 kg/m3).

An aqueous solution of calcium chloride 30% concentration 104/52 (which is 81,2 ml =1281 kg/m3).

Polyvinyl alcohol 6/3.

The ratio of wt. hours between the specified solution of calcium chloride and polyvinyl alcohol is 1.00:0,06 respectively, between the solutions of calcium chloride and sodium silicate is 1.16:1.00, respectively.

Conduct all operations as described in example 1.

Characteristics of the insulation screen:in=0, Kg=0, R=3,47 MPa, KPL=4,4, E= 25,3 HPa.

Example 4

Prepare 200 g of the composition, g/wt.%:

An aqueous solution of sodium silicate 40% concentration 100/50 (which accounts for 71.4 ml =1400 kg/m3).

An aqueous solution of calcium chloride 30% concentration 92/46 (which is 71,8 ml =1281 kg/m3).

Polyvinyl alcohol 8/4.

The ratio of wt. hours between the mi solutions of calcium chloride and sodium silicate - to 0.92:1.00, respectively.

Conduct all operations as described in example 1.

Characteristics of the insulation screen: Kin= 7,9110-4μm2TOg=2,4910-3μm2TOp=8,2103R=2,02 MPa, KPL=5,3, E=27.8 HPa.

Example 5

Prepare 200 g of the composition, g/wt.%:

An aqueous solution of sodium silicate 40% concentration 80/40 (which is 57,2 ml =1400 kg/m3).

An aqueous solution of calcium chloride 30% concentration 116/58 (which is 90,6 ml =1281 kg/m3).

Polyvinyl alcohol 4/2.

The ratio of wt. hours between the specified solution of calcium chloride and polyvinyl alcohol is 1.00:0,03 respectively, the ratio of wt.h. between these solutions of calcium chloride and sodium silicate - of 1.45:1.00, respectively.

Conduct all operations as described in example 1.

Characteristics of the insulation screen:in= 7,6510-5μm2TOg=5,9210-5μm2TOp=8,5104R=2.91 MPa, KPL=3,1, E=31,4 HPa.

Compared with the reference values obtained insulating screen improved: permeability - 8 times, and to the complete lack of it; the permeability is 4 times the Aza, plasticity index - 1.2-2 times the modulus of elasticity is 9.7 -14,4 times.

Composition for insulation of water in the well, consisting of a polymer, an aqueous solution of sodium silicate 40% concentration, an aqueous solution of calcium chloride 30% concentration, characterized in that the polymer it contains polyvinyl alcohol in the following ratio of ingredients, wt. %:

Polyvinyl alcohol - 2-4

This solution of sodium silicate - 40-50

This solution of calcium chloride - 46-58

moreover, the ratio of wt. hours between the specified solution of calcium chloride and polyvinyl alcohol is 1.00 : 0.03 to 0.09, respectively, between the solutions of sodium silicate and calcium chloride - 1,00 : 0,92 - 1,45 respectively.

 

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