Foam-forming compound for shutting wells

FIELD: oil and gas extractive industry.

SUBSTANCE: foam-forming compound for shutting wells contains hydrocarbon liquid, mixture of surfactants, one of components thereof is water solution of lignosulphonate reagent of 25% concentration, herbal filling agent and 20% water solution of calcium chloride, as lignosulphonate agent reagent it contains powder-like technical lignosulphonate, and as other component of surfactant mixture - hexamethylentetramine, and as herbal filling agent - peat or grass flour with following ratio of components in percents of mass: hydrocarbon liquid 12-14, said water solution of technical powder-like lignosulphonate 17-21, hexamethylentetramine 0.17-0.63, peat or grass flour 3-6, said calcium chloride solution - the rest, while relation of mass portions between said water solution of technical powder-like lignosulphonate and hexamethylentetramine is 1: 0.01-0.03 respectively, as grass flour it contains pulverized herbal waste of grain bread production or similar substance.

EFFECT: higher efficiency.

2 cl, 18 ex, 1 dwg

 

The invention relates to the oil and gas industry, in particular foaming compositions, and can be used for plugging wells during repair work in conditions of abnormally low formation pressure (anpd), including wells with loose laborzentrifugen layers.

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

well - known emulsion for killing the well, the recipe of which has the following ratio of components, wt.%:

Gas condensate28-35
Kssb7-12
Calcium chloride18-24
Soda ash1-3
Urea0.5 to 1.5
Chemically precipitated chalk (XOM)1-3
Waterrest

(see RF patent №2168003 from 25.06.1999, CL E 21 In 43/12, publ. ON No. 15, 2001).

The disadvantages mentioned emulsion are reduced physico-chemical parameters and technological properties. This is due to the following reasons: increased density of the emulsion does not allow her to apply for plugging wells in different geological conditions. Due to the high content of gas condensate, which panoramical is m, the composition of the process fluid not practically foams. In addition, the reduction ratio of the foam also promotes HOM role filler. His additional amount is formed in the emulsion by the interaction of calcium chloride and soda ash, which has a positive effect on anti-filtration and rheological parameters, several stabilizes the composition of the emulsion. Urea, interacting with active functional groups kssb, can only marginally improve its emulsifying ability, as kssb already modified with formaldehyde and phenol in the production process kssb as commercial reagent, and a reaction-active group in kssb to interact with urea virtually none. Kssb has a high sorption capacity and on the surface of the cementing material of sand and rocks creates rasuplotnenie layer that facilitates the flow of ion-exchange processes in clay (calcium chloride) and change in the structure of the productive formation. Upon contact with loose rocks kssb with high sorption capacity and possessing a “wedging” action with respect to the formation rock, resultsthat its structure, creating the conditions for interaction of the aqueous phase of the composition (calcium chloride) as with the reservoir and with saturating it in the formation fluids. This leads to a decrease of the natural permeability of the formation.

The formulation of the emulsion determines the possibility of interaction of calcium chloride with the reservoir fluid with the formation of insoluble precipitates (for example, in the presence of formation water sulfate ion), resulting in increasing pressure release layer and disruption of its structure, accompanied by sand or formation of clay-sand tubes in the well. In addition, since the release layer after killing the specified emulsion may be carried out at elevated depression, there is a need for acid formation treatment. In the result of the presence in the composition of the emulsion, mineral filler HOM role of the solid phase and clogging of the pore space of the reservoir in the destruction of panamoney, even when processing layer of acid to dissolve the chalk to restore the permeability of the formation to levels close to daemonname, is not possible. This leads to an increase in the time of well completion and release it on dormantly mode of operation;

- known foamable composition for killing the well, the recipe of which has the following ratio of components, wt.%:

The foaming agent based on water dissolve the and lignosulfonates reagent 4-20
Hydrocarbon liquid12-31
A mixture of shredded sprouts three of barley with the powdery lignosulfonate with a reagent selected from the group of ligno-sulfonate technical, condensed sulfite-alcohol bard, ferrochrome-sulfonate, lignes3-10
An aqueous solution of calcium chloride density 1120-1280 kg/m3rest

moreover, the ratio in the above-mentioned mixture of 1:0.5 to 2.0, and as specified foaming agent contains a reagent selected from the group: technical lignosulphonate, condensed sulfite-alcohol bard, ferro-chromogenicity, lignes in the form of an aqueous solution density 1130 kg/m3(see RF patent №2208036 from 18.09.2001, CL 09 To 7/08, E 21 In 43/12, publ. in ABOUT No. 19, 2003).

The disadvantages of this foamable composition are reduced physico-chemical parameters and technological properties. This is due to the following reasons: reduced the ratio of the foam while maintaining its satisfactory resistance to separation of the aqueous phase is a consequence of the high content of hydrocarbon fluid composition to 31 wt.%, which acts as a stabilizer, at the same time as a defoamer. Due to lack of multiplicity foamable composition is unable to obtain a foam with a minimum density, what is needed for well killing with loose laborzentrifugen layers under conditions of abnormally low to prevent their destruction in case of application of the locking systems with higher than determined by the characteristics of the reservoir and geological conditions of the well density. The reduction ratio of this composition is facilitated by the fact that the composition contains calcium chloride fairly high density - up to 1280 kg/m3. Unstabilized phase composition due to the fact that used as filler barley grass, like any filler plant origin, different hydrophobic properties because they contain fats. Therefore, their uniform distribution in the amount of the hydrophilic dispersion medium of the composition is very problematic and to a certain extent due to adsorption on the surface of the lignosulfonate, the hydrophobic ends of which are oriented to the particles sprouts of barley, and hydrophilic in the aquatic environment. Because of this filler is able to be divided by the volume of the liquid phase of the foam, though unevenly, resulting in separate metalloceramic plots and filtering the liquid from the composition into the formation.

Used in the foaming composition types of lignosulfonates are a good leavening of rocks ka the surface-active substances (surfactants) with high sorption capacity on the interface. Since all used lignosulfonates (except lignosulfonates) are modified with polyvalent cations or aldehydes (alcohols) forms, their activity to the condensing effect of the cations calcium (present in the composition of calcium chloride) is negligible. There is a possibility of interaction of calcium chloride with formation fluids from the formation of poorly soluble products, clogging layer. As a result the structure of the latter is changed, which may lead to increased pressure release, and during operations in wells with loose laborzentrifugen layers to the sand and the formation of clay-sand tubes in the well. Typically, when such complications recovery coefficient of permeability of the productive formation is not high enough. This leads to increase in terms of completion time and output on dormantly mode of operation and, consequently, to lower volumes of production;

- known phenomology composition for killing the well, the recipe of which has the following ratio of components, wt.%:

Calcium chloride aqueous solution density 1180-1200 kg/m361,7 is 66.2
Kssb, an aqueous solution of 25%concentrate the radio of 17.2 and 17.3
Hydrocarbon liquid13,9-14,2
Grass meal (TM)2,7 to 6,8

(composition recalculated from the parts by weight in%by weight: see RF patent №2205943 from 20.09.2001, CL E 21 In 43/12, From 09 To 7/08, publ. in ABOUT No. 16, 2003). As TM composition contains chopped vegetable waste grain breads or cereals, or oil, or spinning crops, or a mixture of grasses annual and perennial plants.

The disadvantages of this panimulang composition are reduced physico-chemical parameters and technological properties. This is due to the following reasons: the composition is characterized not sufficiently uniform distribution of the filler by volume panamoney, due to the hydrophobic nature of the filler - TM due to the presence on the surface of its particles lipid film that prevents wetting and impregnation of the filler with an aqueous solution of the dispersion medium. Having a low density of TM compared to the density of the dispersion medium, which is panamoney, not quite evenly distributed over the column of foam in the well, which negatively affects bridging ability of the composition and reduces the effectiveness of its application in the conditions of abnormally low.

Due to the hydrophobic nature of the TM structure is not sufficiently high the s indicator ratio of foam, due to the damping of the latter on the surface of particles of TM in the presence of fat on them film, which limits the application of the composition in wells with loose laborzentrifugen layers.

Specified phenomology composition may have an adverse effect on the structure formation. In conjunction with the “disjoining” (loosening) rock action kssb as surfactants calcium chloride in the process of physico-chemical effects cementitious material loose rock formation - clay displaces the sodium cations from the exchange complex, and the clay turns into calcium. This rearrangement leads to disruption of the structure forming the walls of the well loose rock, changing its natural permeability.

Interaction of calcium chloride with the reservoir fluid, leads to the formation of reaction products, the volume of which exceeds several times the volume of raw materials (for example, the formation of gypsum in the presence of formation water sulfate ion). There is a partial clogging of the reservoir, causing the need to increase the pressure of his release after completion of repair work, resulting in a likelihood of occurrence of sand and education in the borehole clay-sand tubes. The recovery coefficient of permeability of the productive formation is reduced, which juice is await the completion time and the time it dormantly mode of operation;

as the prototype was taken foamable composition for killing the well, the recipe of which has the following ratio of components, wt.%:

Coffs harbour0,05-0,22
Kssb, an aqueous solution of 25%concentration17-19
Hydrocarbon liquid12-15
Peat3-7
An aqueous solution of calcium chloride density 1180-1200 kg/m3rest

(see RF patent №2152973 from 26.05.1998, CL 09 To 7/08, publ. in ABOUT No. 20, 2000).

The disadvantages of this foamable composition are reduced physico-chemical parameters and technological properties. This is due to the following reasons: lack of uniform distribution of the filler - peat by volume foaming composition due to its large water capacity, resulting in disturbed the stability of the composition. More light dispersed phase is a hydrocarbon liquid in the form of oil droplets differs in density from the second dispersed phase - peat - saturated aqueous solution of calcium chloride. What is happening in time by the difference in densities of the redistribution of the dispersed phase in the amount of foamable liquid does not make it sufficiently stable phases of the first composition and reduce the effectiveness of the application in conditions of abnormally low.

Formed from the above composition, the foam has a low multiplicity, due to the action of Coffs harbour, consisting of alcohols (furfuryl and diols), which defoamers and destabilization pseudodimension films. Therefore, when the foaming composition is formed of low expansion foam with high density, which reduces the efficacy of the composition in the killing of wells with abnormally low and loose laborzentrifugen layers.

Due to the low rate of formation of the filtration barrier part of the dispersion medium composition penetrates into the reservoir, reducing its permeability, which leads to an increase in the time of well completion and exit on dormantly operation.

The disadvantages of the composition is the ability kssb and calcium chloride to the physical-chemical interaction with cementitious material loose rocks. Influence of calcium chloride on the loose laborzentrifugen rock formation attributable to the following: calcium chloride interacts with the reservoir fluid with the formation of insoluble precipitates (for example, in the presence of formation water sulfate ion), resulting in increasing pressure release layer and disruption of its structure, accompanied by sand or formation of clay-sand tubes in the well. The result is a reduction coefficient is the restoration of the permeability of the productive formation.

Activity kssb reduced due to the modifying action of Coffs harbour. However, since the content of Coffs harbour as part slightly, “wedging” action kssb on cementitious material loose rock formation continues to take place, which leads to a change in the structure of the reservoir due to the physico-chemical interaction of the composition with a cementing material loose rocks and, consequently, reduces the natural permeability of the formation.

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

improved physico-chemical parameters of the foaming composition:

- stabilized phase composition due to uniform distribution of filler plant origin, which increases the efficacy of the composition under conditions of abnormally low;

- enhanced foam that allows you to extend the range of application of the composition in various mining and geological conditions;

decreases physical-chemical interaction foaming composition with cementing material loose rock formation, which prevents the reduction of its natural permeability;

improved technological properties of the foamable composition:

- reduced the pressure release layer after the renovations, which prevents the sand and the image is of a clayey-sand tubes in the borehole;

- increases the rate of recovery of the permeability of the reservoir, which reduces the period of development wells and the time dormantly operation, contributes to the production of additional gas volume.

The technical result is achieved by using known foamable composition for killing wells consisting of hydrocarbon liquids, mixtures of surfactants, one component of which is an aqueous solution lignosulfonates reagent 25%concentration, filler vegetable origin and an aqueous solution of calcium chloride 20%concentration, which as lignosulfonates reagent contains the technical lignosulphonate powder (lstp), as another component of the mixture of surfactants is hexamethylenetetramine, and as a filler plant origin - peat or TM, in the following ratio, wt.%:

Hydrocarbon liquid12-14
An aqueous solution LLP 
25%concentration17-21
Hexamethylenetetramineto 0.17 to 0.63
Peat or TM3-6
This solution of calcium chloriderest

moreover, the ratio of parts by weight between the decree which authorized the solution lstp and hexamethylenetetramine 1:0,01-0,03, respectively. As a TM it contains chopped vegetable waste grain breads or cereals, or oil, or spinning crops, or a mixture of grasses annual and perennial plants.

The inventive composition meets the condition of “novelty”.

Lstp use THE 13-0281036-15-90, hexamethylenetetramine - according to GOST 1381-73, TM - according to GOST 18691-88, as the hydrocarbon liquid used diesel or gas condensate - by GOST 305-82, calcium chloride according to GOST 4460-77.

Peat is an organic rock formed by the accumulation of plant residues affected by incomplete decomposition in swamp areas with difficult access of air and high humidity. The dry matter of peat consists of not fully decomposed plant residues, decomposition products of plant tissues in the form of particles or aggregates of humus (humus), mineral substances. The content of organic component in the peat is 80-99% of dry substance, humic compounds in the organic component is in the range 16-86%.

Peat contains (in addition to humic) complex of various organic compounds such as hemicellulose, a mixture of high molecular weight polymers of cellulose, organic substances with hydrophilic and hydrophobic components, starch and pectin, bitumen, lignin and low molecular weight compounds. Gerofi the performance communications components of peat contain active functional groups: carboxyl (COOH), hydroxyl (Oh), carbonyl (C=O), phenol (C6H6OH), amine (NH2), and others. These groups can interact with each other through hydrogen bonds, as well as through one or more water molecules, via polyvalent cations. The hydrophobic component of the peat is mainly bitumen.

TM is made from plant waste grain breads or cereals, or oil, or spinning crops, or a mixture of grasses annual and perennial plants that are rich in protein and fiber. To cook TM can also be used straw and chaff.

The main composition of raw materials for the preparation of TM following, wt%: protein 4,4-16,9; fat 1,3-7,5; cellulose 26,4-42,9; nitrogen-free extractive substances 36,2-48,7; the ashes of 7.5 to 16.5 (see Composition and nutritive value of forages: a Handbook / Issurin, Gepdiremen, Amortising and others; Ed. by Issuelink. - M.: Agropromizdat. - 1986. - 303 S.).

The table below shows the main chemical composition of TM made from a variety of agricultural crops and their waste.

Table
Raw material for making TMChemical composition, wt.%
ProteinFatFiberBEVAsh
Grass natural lands13,02,928,545,310,3
Annual herbs13,23,026,445,611,8
Perennial grasses14.4V3,429,244,38,7
Mixture:     
- legumes16,92,627,342,610,6
- cereal11,72,927,948,78,8
- cereal-legumes12,93,027,747,58,9
Sunflower11,77,529,739,311,7
Chaff:     
- wheat9,01,337,036,2165
buckwheat12,6-26,6to 47.213,6
- soy15,2the 5.729,240,89,1
Straw:     
- wheat4,41,642,943,37,8
buckwheat7,51,837,642,410,7
- Sudan grass5,81,440,444,87,5

The feedstock for the preparation of TM from agricultural crops or waste pre-crushed in a cut with a particle size up to 100 mm in aggregates of type IR-3, GCI-30A, RCC-6 and other Then the crushed mass with a particle size of from 20 to 100 mm comes in a universal mill or crusher type AVM, MDU and others, where it is crushed to the consistency of grind with the residue on the sieve (the cell size of 3 mm) not more than 5%.

The presence of a foaming composition of the filler particles of vegetable origin - peat or TM of the a number of organic compounds with different options the regional groups leads to the implementation of the colloidal and physical properties of the resulting dispersed system.

The combined use of components contributes to obtaining the inventive foamable composition with improved physico-chemical parameters and technological features ensure the effectiveness of killing the well under conditions of abnormally low in the process of renovations, including wells with loose laborzentrifugen layers. This is due to the following processes.

In the aqueous dispersion medium foaming composition of peat is in the form of particles are spherical, oval and fibrous forms, and the formation of colloid-dispersed structures is complex. Intermolecular forces of interaction between particles of peat occur as a result of the interaction of the fluctuations of the electromagnetic field. The interaction between macromolecules organic substances via water molecules, as well as by hydrogen bonds (this also applies to TM to have similar to peat chemical composition). In the presence of polyvalent cations in the dispersion medium, in which are these fillers vegetable origin, peat or TM, are heteropolar interaction (merging their macromolecules): there supramolecular education and organo-mineral complexes, which can be combined in associates (units) different to what mactest. In this phase (aggregate) the stability of the composition is reduced.

Macromolecules lstp represent unordered branched spirals with different degree of compaction. Low molecular weight fractions, as a rule, have a linear character. Distinct polydispersity, the presence of a charge, the high degree of dissociation indicate that precedence are strongly associated high hydrophilic palimony. Structure them in the form of aromatic chains with incorporated functional groups determines the dipole nature, surface activity, high adsorption and reactivity lstp.

Used in the composition of the aqueous solution lstp 25%concentration with pH=4,5 actively interacts with hexamethylenetetramine, which has an alkaline character. When this happens branching chains of low molecular weight fractions lstp linear nature. On the other hand, hexamethylenetetramine, amylea fats on the surface of the particles TM or interacting with humic acids of peat, changes the properties of the surface layer of the particles in such a way that they become adapted to the aqueous phase of the dispersion medium. When this foam obtained from the inventive foamable composition is increased by hexamethylenetetramine by reducing with it negative effects of Hydra is faabnoi surface film of particles of peat or TM on the ability of the inventive composition to foam. Increased foam allows you to extend the range of application of the inventive foamable composition and use it for killing wells under conditions of abnormally low at low values of the coefficients of the anomalous (up to 0.5).

The surface of the particles TM of hydrophobic becomes hydrophilic, and peat - more sorptiondesorption to lstp (through together with hexamethylenetetramine)than the adsorption and absorption of calcium chloride. In addition, under the action of hexamethylenetetramine is a simple chemical activation of peat, a mandatory element of which is the surface of alkaline hydrolysis, resulting in peat particles become aggregately stable and capable of forming an internal structure. Due to these processes is a more uniform distribution of the filler - peat or TM in size, which leads to stabilization of the phase composition and increases the efficiency of application of the foamable composition under conditions of abnormally low.

Functional groups lstp low molecular weight fractions reacted with hexamethylenetetramine, as a result of its high sorption capacity on the surface of particles of peat or TM and drops hydrocarbon fluid cause a uniform distribution lstp on the surface of the dispersed phase. When this surfactant-based lignosulfonate, proteinopathy is with hexamethylenetetramine, adsorbed on the surface of droplets of the hydrocarbon fluid, focusing hydrophobic ends in the direction of the latter, and hydrophilic - water solution. Such globules strengthen the surrounding air bubbles in the superficial layers of the adsorption film, aiding in the action of electrostatic forces them to be more evenly distributed over the volume of the resulting foam, which also contributes to the stabilization of its phase composition. Thus, the positive effect of hexamethylenetetramine on the low molecular weight fraction lstp is that the structure improves and stabilizes the phase composition of multi-component foamable composition on the one hand, and the reduction of “wedging” action lstp as a surfactant on cementitious material loose rock formation on the other, which greatly reduces the interaction of other components of foam formulations with rock and reservoir fluids, reduces the coefficient of changes in the structure and, consequently, reduction of the natural permeability of the reservoir. The latter is due to the following processes.

Functional groups lstp high molecular weight fractions virtually unrelated (except reacted with hexamethylenetetramine part linear in nature)that determines the possibility of their interaction with reactive what gradiently foaming composition. So, when interacting lstp with calcium chloride, which is one of the components of the foamable composition, enlarging their molecules, due to the condensing effect of polyvalent cations (CA2+). When this occurs, a new colloidal phase, which, as a result of adsorption on the surface of air bubbles formed by the foaming of the composition, increases the strength of the surface adsorption layer and increase the stability of the bubbles. As a result, as well as adsorption lstp peat or TM by hexamethylenetetramine on the above described mechanism, sorption capacity and reactivity lstp as a surfactant in relation to the cementing material loose rock formation is sharply reduced. “Disjoining” (loosening) the action lstp on the producing formation and physico-chemical interaction with him lstp reduced. Associated with lstp calcium chloride, in turn, have no negative impact on structure formation due to possible interaction with formation fluids containing sulfate ions, reactions

l2+SO

2-
4
+2H2About→ CaSO4·2H2About↓ +2l2-.

Formed in rezultatele dowolny calcium sulfate (gypsum) - low connection - collateral the pore space of the reservoir and causes a volumetric stresses.

Collectively, the above-described processes of interaction of components of the inventive foamable composition prevents the specified negative impact, which leads to reduction of the rate of change in the structure of the core (see test report) and leads to the preservation of the natural permeability of the formation.

The ratio of the components in the inventive foamable composition is chosen so that unbound functional groups lstp almost completely could react with the calcium chloride, which eliminates adverse effects on the producing formation in interacting with formation waters and possible the sedimentation of reservoir products of the reactions. In addition, the particles used fillers of plant origin due to the modifying action of hexamethylenetetramine have weaker adhesion to the rock formation, adhesion of the individual fibers and their concentration in the form of plugs in the pore space of the formation does not occur. As a result, the pressure release layer after repair in the well is reduced. In terms of weakly cemented friable rock formations that prevents the sand from the well and the formation in it of Gini is then sand-tubes.

When jacking in the layer of foamable composition of its blocking properties are implemented through education in the pores and channels of the formation of a mesh structure of the fibers and separate particles of peat or TM, a cell which is filled with penumonia (bubbles and droplets of hydrocarbon liquid, dispersed in an aqueous solution lstp and calcium chloride). Peat particles or TM with sufficient strength and elasticity, are held on an uneven surface of the rock due to the fibrous formations and the ability to cling to the rough edges and ledges of rocks as it moves into the reservoir. The resulting net frame has the property of "check valve": withstands relatively high pressure drops in the reservoir, i.e. in the direction of injection of the foamable composition, but can be easily removed from the reservoir with a slight depressions (up to 300 kPa), which excludes the possibility of dilatancy, which can be reduced to the natural permeability of the reservoir.

Collectively, the above technological properties of foam formulations increase the recovery factor of permeability of the productive formation (see test report). This reduces the completion time and the time of their release on dormantly mode of operation, the volume of the produced gas.

That is they way the achievement of the technical result from the use of the claimed composition for the killing of wells with abnormally low, including wells with loose laborzentrifugen layers, caused by a combination of colloidal and physical properties of the foamable composition, realized thanks to its formulation and the quantitative ratio of the components, ensuring stabilization of the phase composition, reduction of physico-chemical interaction with cementitious material loose rock formation and improvement of technological properties. Due to their fibrous structure used fillers vegetable origin formed a strong reinforcing frame and the composition does not penetrate into the formation to a greater depth even with the high permeability of the reservoir. This greatly facilitates the removal of the composition from the reservoir during the release in the process of completing repairs and is one of the main conditions for the restoration of its reservoir properties.

The content in the composition of the aqueous solution lstp 25%concentration at less than 17 wt.%., hexamethylenetetramine less to 0.17 wt.%, the hydrocarbon liquid is less than 12 wt.% and filler plant origin less than 3 wt.% does not ensure the formation of the foam system with the required process parameters.

The content in the composition of the aqueous solution LSTP%concentration of more than 21 wt.%., hexamethylenetetramine more to 0.63 wt.%, hydrocarbon liquid for more than 14 wt.%. and filler plant origin more than 6 wt.% impractical, since a significant increase of the technological properties of the composition does not occur.

Use as part of hexamethylenetetramine, taken in the ratio of parts by weight to the aqueous solution lstp 25%concentration less than 0.01:1, respectively, does not provide implementations of colloidal and physical properties of the foaming liquid in terms of its multiplicity, stabilization phase composition, the impact on the reservoir as by interaction with him, and with formation fluids (increases the rate of changes in the structure), but also leads to reduction in the rate of recovery of the permeability of the reservoir.

Use as part of hexamethylenetetramine, taken in the ratio of parts by weight to the aqueous solution lstp 25%concentration 0.03:1, respectively, not enhancing technological properties of the composition, and therefore not economically feasible.

Thus, according to the above proposed foaming composition to achieve the claimed technical result.

Analysis of inventive step were as follows.

Know the use of hexamethylenetetramine (urotropine):

as the reducing agent in heliobas the next composition for insulation works well to improve its technological options, while increasing the time of gelation at temperatures up to 120° (See A.S. USSR №1730432 from 24.02.1989, CL E 21 In 33/138, publ. in ABOUT No. 16, 1992);

as a cross-linking agent: viscoelastic composition to improve insulation and strength properties of the composition (see A.S. USSR №1452938 from 17.03.1987, CL E 21 In 33/138, publ. in ABOUT No. 3, 1989); in the gel-forming composition for the regulation of the waterflood front of a productive formation in a mixture with chromium substances with the aim of increasing the gel strength (see RF patent №2112137 from 18.06.1996, CL E 21 In 43/22, publ. ON No. 15, 1998); in viscoelastic composition for insulation work in the wells with the aim of improving the technological properties of the composition - increased strength, reduced shrinkage and a reduction in the rate of thermal degradation (see RF patent №2147672 from 26.10.1998, CL E 21 In 33/138, 43/22, publ. in ABOUT No. 11, 2000); composition for regulating the development of oil fields with the aim of increasing the effectiveness of the composition due to the improvement of rheological properties (see A.S. USSR №1809000 from 05.06.1991, CL E 21 In 33/138, 43/22, publ. in ABOUT No. 14, 1993);

in the composition for enhanced oil recovery with the aim of expanding the field of application for strata with low reservoir temperature below 60° and improve the filtration characteristics of the composition (see RF patent №2066743 from 08.02.1993, CL E 21 In 43/22, publ. in No. 26, 1996);

in cement mortar for cementing oil and gas well is to increase the tensile strength of the cement stone and the increase of the hardening period (see as the USSR №1033710 from 12.04.1982, CL E 21 In 33/138, publ. in No. 29, 1983);

in the preparation method of emulsion drilling fluid to reduce the temperature of the cooking process (see A.S. USSR №1308611 from 29.10.1985, CL 09 To 7/02, publ. ON No. 17, 1987); in drilling mud to reduce corrosion activity of the latter in relation to the steel equipment in the conditions of the hydrogen sulfide aggression (see A.S. USSR №1257083 from 04.12.1984, CL 09 To 7/00, publ. in No. 34, 1986);

in self-evolving foam system for development wells with the purpose of self-generation system at any positive temperature (see A.S. USSR №1035201 from 01.02.1982, CL E 21 In 43/25, publ. in No. 30, 1983);

- as a catalyst in the method of producing reagent for treatment of drilling fluids to reduce the duration of the process while reducing reagent consumption (see A.S. USSR №1252330 from 04.12.1984, CL 09 To 7/02, publ. in ABOUT No. 31, 1986);

in the foamable composition in combination with the sulfonic acid to clean the wells from the sandy tubes to improve foaming properties of the composition (see A.S. USSR №1559119 from 10.03.1987, CL E 21 In 43/00, publ. ON No. 15, 1990). The composition contains methenamine in very large quantities (6-10 wt.%), in 35-156 times higher than its content in the inventive foamable composition, which is not itself methenamine is Peno what OBRAZOVATEL, and increasing the ratio of foam is due to the interaction of urotropine (0,17 to 0.63 wt.%) with fats surface film peat or TM, which prevents foaming of the composition, as fats are defoamers.

It is of interest fluid for hydraulic fracturing, which can be used as fluid for plugging wells containing lignosulfonates, modified by hexamethylenetetramine and urea (see RF patent №2138633 from 17.03.1998, CL E 21 In 43/26, publ. in No. 27, 1999). This liquid can be used for plugging wells with loose laborzentrifugen layers, because it has a high density (1210-1230 kg/m3), which is unacceptable for the conditions of abnormally low. Also used in technical lignosulfonates, modified by hexamethylenetetramine and urea, are ready-made commercial product, in which the macromolecule salts of lignosulfonic acids by active functional groups associated with hexamethylenetetramine and urea in a high-molecular complex compounds. In the result, this decreases the possibility of interaction between functional groups of lignosulfonate with cations of polyvalent metals, providing due to their condensing action of the formation of a new colloidal phase with h is some sorption activity for hydrocarbon environments, what is needed to apply the reagent compositions foaming liquids containing condensate or diesel fuel and filler plant origin. In this regard, the use of a commercial product - technical lignosulfonates, modified with hexamethylenetetramine and urea to obtain a foamable liquids with high technological performance is impractical.

The liquid has some inhibitory ability against swelling clay rocks, mainly due to the content of potassium chloride, while the inhibitory effect of modified lignosulfonate very slightly, so as amides of lignosulphonic acids (products of the interaction of the latter with urea) is not stable in saline solutions, and can be either hydrolyzed with ammonia.

It is known the use of a mixture of aliphatic amines (bases) as an inhibitor of softening and dispersing of the rocks composing the walls of the wells, in the environment of the drilling fluid in the drilling process (see A.S. USSR №861387 from 25.12.1979, CL 09 To 7/02, publ. in No. 33, 1981).

Know the use of lignosulfonates along with calcium chloride:

in the composition for preparation of process fluids to ensure lowering the pour point of the composition, is Nigeria depth of its penetration into the reservoir and ensure thermal stability during injection of the composition in the bottom zone of the well with high formation temperatures (see RF patent №2005762 from 13.05.1992, CL 09 To 7/02, publ. in ABOUT No. 1, 1994);

- in a structured composition for repair of wells with the goal of making the composition of the values of the static shear stress and the ability to decollimate bottom-hole formation zone of iron oxide with simultaneous prevention of the precipitation of the composition, as well as increasing the viscosity of the composition and reduce its filtration (see RF patent №2044754 from 29.03.1993, CL 09 To 7/04, E 21 In 43/26, publ. in No. 27, 1995);

in the way of development of oil fields with the goal of redistribution of filtration flows in the flooded beds and involvement in the development of areas with high saturation to more fully extract the oil from heterogeneous reservoirs (see RF patent №2127802 from 22.07.1997, CL E 21 In 43/22, publ. in ABOUT No. 8, 1999);

in the emulsion composition for hydraulic fracturing (and also for killing) as filtrate agent - technical lignosulphonate to reduce pressure loss by friction while maintaining the high quality emulsion composition as a frac fluid: high viscosity, pescaderia ability, low filter, and adjustable destruction (see RF patent №2097547 from 19.09.1996, CL E 21 In 43/26, publ. in No. 33, 1997);

in the method of chemical treatment of clay drilling fluids using liquid technical lignosulfate the ATA, modified Chronicon in an alkaline environment, and as gumannogo component - peat to achieve a wide absolutego effect of the qualities of clay drilling muds: optimization of lubricant (protivoprigarnykh), inhibiting, filtration and rheological properties while reducing the complexity and cost of chemical processing (see RF patent №2134283 from 03.09.1997, CL 09 To 7/02, publ. in ABOUT No. 22, 1999).

Not detected for existing 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 meets the condition of “inventive step”.

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

In field conditions hold jamming at well # 686 North Stavropol UGS.

The source data
Production column168 mm
The bottom of the production string789 m
Tubing (tubing)73 mm
The depth of the descent tubing689,6 m
The perforation interval690-705 m
Art is the public face 770 m
The current slaughter749 m
Pressure2,32 MPa
Pipe pressure1,82 MPa
Annular pressure1.85 MPa

For killing the well is necessary to prepare a 6 m3foaming of the composition. To do this, use two cementing unit CA-320 - 1 and 2, three capacity - 3, 4 and 5 closed loop.

The drawing shows a diagram of the piping of the well at killing under conditions of abnormally low.

In the vessel 3 of 10 m cook 3.6 m or 4238 kg of an aqueous solution of calcium chloride 20%concentration. For this 850 kg of calcium chloride are dissolved with stirring using CA-320 3398 l of water. In the vessel 5 of 10 m cook 1.2 m or 1320 kg (19 wt.%) aqueous solution lstp 25%concentration density of 1100 kg/m3. For this 330 kg powder lstp dissolved in 990 litres of water with periodic mixing pump CA-320, then add 26,4 kg (range 0.38 wt.%) hexamethylenetetramine. Incubated for 1 day for complete dissolution lstp. Capacity 4 volume 3 m3is used to store 1.2 m3or 996 kg (14 wt.%) diesel fuel density of 830 kg/m3and the preparation of the emulsion, followed by mixing it with TM. Then the container 5 from the tank 4 is poured diesel fuel, the mixture is stirred using the CA-320 to obtain stable emulsions. Using CA-320 from the tank 5, the obtained emulsion is pumped into the previously prepared in a separate tank 3 aqueous solution of calcium chloride 20%concentration.

The final stage of the preparation of the foamable composition for killing produced in the vessel 3.

As soon as the mixture will be noted the first signs of foaming, it is injected with constant stirring 356 kg (5 wt.%) TM from soybean straw, crushed to the consistency of grind with the residue on the sieve (the cell size of 3 mm) not more than 5%. The mixture is stirred to obtain a ready-to-use homogeneous dispersion of TM in the foaming liquid.

The discharge obtained foamable liquid with herbal flour to perform well under pressure of 2.35 MPa, exceeding the gas pressure at the mouth of the CA-320, through included in the piping tube or annulus idcategory ejector EZHG 1--4.5 6 for the purpose of aerating dispersions TM and education foaming composition.

After plugging wells foaming composition of conduct repairs. After the reservoir will unlock when the depression 250 kPa, and then produce the well completion of a two-phase foam, gradually reducing the back pressure on the reservoir to receive the flow of gas.

The application of the foamable composition time of completion (call flow of gas) is reduced to 2 hours is, and output on dormantly operation mode from 30 to 2 days.

Example 1 (laboratory).

Prepare 1000 g of a foaming composition: 191 ml of an aqueous solution lstp 25%concentration (ρ =1100 kg/m3), which is 21 wt.%, add 2.1 g (of 0.21 wt.%) hexamethylenetetramine and stirred for 15 minutes until it is fully dissolved, then poured 157 ml of diesel fuel (ρ =830 kg/m3), which amounts to 13 wt.% and 532 ml of an aqueous solution of calcium chloride 20%concentration (ρ =1180 kg/m3), which is 62,79 wt.%. After mixing and signs of foaming in the mixture of fluids injected 30 g (3 wt.%) peat and then mix thoroughly. Moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,01.

The resulting composition (50% of its volume) is injected into the core at the maximum withstand foamable composition (without disruption) pressure drop and leave for 24 hours, after which determine its blocking properties on pressure breakout foam screen backwashing core - pressure release. The rest of the foamable composition are used to determine the multiplicity and stability evaluation phase composition.

The stability of the phase composition (aggregate stability) in a static state is determined as follows. Prigot is undertaken foamable composition is poured into two measuring cylinder 250 ml each. To prevent influence on the foam of the external environment and the evaporation of the liquid measuring cylinders are covered with a plastic film, which strengthen the elastic rubber ring and leave to rest for 1 day.

After this time the tick marks on the walls of the cylinders to measure the volume occupied emerges at the surface or deposited on the bottom of the filler particles. The stability of the phase composition characterizes the ability of foam to hold the filler in the height of the column of foam without breaking or releasing it as the solid phase of the foam. The stability of the phase composition is defined as the ratio of volume of foam with uniformly distributed filler to the initial volume of the foam with filler, which is calculated by the formula

where CFSstability of the phase composition, %;

V1- the initial volume of the foam filler, ml;

V2- the volume of foam separated (unevenly distributed) filler, Jr.

The results of the determination WithFSfoaming composition obtained in two cylinders, calculate the arithmetic mean value of this index.

In the filtrate obtained from the composition within 24 hours after determining blocking properties, put the core sample containing about 20% clay, and 1 succ which determine the rate of change of its structure in relation to the increment of the height of the core sample after testing to its height before testing. Tests carried out with the use of the device PNZ-2 design Thisnamenode in accordance with standard procedure (see Capowski EVGENIY Laboratory work on the soil and soil mechanics. M., Nedra, 1975. - 304 S.).

Foamable composition has the following physicochemical parameters: frequency - 3,0; the stability of the phase composition - 95%, as well as technological properties: pressure breakthrough foam screen (blocking property) - 13 MPa, pressure release - 170 kPa, the rate of change of the structure of the core - 5.1 percent; the coefficient of restitution of the core permeability is 0.86.

Example 2.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration210/21 (use 191 ml ρ =1100 kg/m3)
Hexamethylenetetramine4,2/0,42
Diesel fuel130/13 (use 157 ml ρ =830 kg/m3)
Peat30/3
An aqueous solution of calcium chloride 20%concentration625,8/62,58 (use 530 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,02, respectively. Conduct all operations as described in example 1.

The obtained foamable composition has, after the relevant physico-chemical parameters: the ratio of the foam - 3,4, stability of the phase composition of 96%, as well as technological properties: pressure breakthrough foam - 13 MPa, pressure release - 165 kPa, the rate of change patterns of 4.4%, a recovery rate of permeability of 0.87.

Example 3.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration210/21 (use 191 ml ρ =1100 kg/m3)
Hexamethylenetetramine6,3/0,63
Gas condensate130/13 (use 181 ml ρ =720 kg/m3)
Peat30/3
An aqueous solution of calcium chloride 20%concentration623,7/62,37 (use 529 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,03 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 3.8, the stability of the phase composition of 98%, as well as technological properties: pressure breakthrough foam - 14 MPa, the pressure release is 150 kPa, the rate of change of structure of 3.9%, a recovery rate of permeability of 0.87.

Example 4.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration210/21 (use 191 ml ρ =kg/m3)
Hexamethylenetetramine2,1/0,21
Diesel fuel130/13 (use 157 ml ρ =830 kg/m3)
TM from baskets sunflower30/3
An aqueous solution of calcium chloride 20%concentration627,9/62,79 (use 532 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0.01 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.7, the stability of the phase composition of 93%, as well as technological properties: pressure breakthrough foam - 12 MPa, pressure release - 175 kPa, the rate of change patterns of 5.0%, a recovery rate of permeability of 0.85.

Example 5.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration210/21 (use 191 ml ρ =kg/m3)
Hexamethylenetetramine4,2/0,42
Gas condensate130/13 (use 181 ml ρ =720 kg/m3)
TM from baskets sunflower30/3
An aqueous solution of calcium chloride 20%concentration625,8/62,58 (use 530 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,02, respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.8, the stability of the phase composition of 95%, as well as technological properties: pressure breakthrough foam - 14 MPa, pressure release - 165 kPa, the rate of change patterns of 4.8%, a recovery rate of permeability is 0.86.

Example 6.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration210/21 (use 191 ml ρ =1100 kg/m3)
Hexamethylenetetramine6,3/0,63
Gas condensate130/13 (use 181 ml ρ =720 kg/m3)
The TM of a mixture of grasses annual and perennial plants30/3
An aqueous solution of calcium chloride 20%concentration623,7/62,37 (use 529 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and what hexamethylentetramine 1:0,03 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.9, the stability of the phase composition of 96%, as well as technological properties: pressure breakthrough foam - 15 MPa, pressure release - 165 kPa, the rate of change patterns of 4.2%, a recovery rate of permeability of 0.87.

Example 7.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration170/17 (use 155 ml ρ =1100 kg/m3)
Hexamethylenetetramine1,7/0,17
Diesel fuel120/12 (use 145 ml ρ =830 kg/m3)
Peat60/6
An aqueous solution of calcium chloride 20%concentration648,3/64,83 (use 549 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0.01 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam - 3.1 stability of the phase composition of 93%, as well as technological properties: pressure breakthrough foam - 27 MPa, pressure release - 285 kPa, the ratio is modify the structure 5.7%recovery coefficient of permeability is 0.84.

Example 8.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration170/17 (use 155 ml ρ =kg/m3)
Hexamethylenetetramine3,4/0,34
Gas condensate120/12 (use 167 ml ρ =720 kg/m3)
Peat60/6
An aqueous solution of calcium chloride 20%concentration646,6/64,66 (use 548 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,02, respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 3.2, the stability of the phase composition of 93%, as well as technological properties: pressure breakthrough foam - 29 MPa, pressure release - 280 kPa, the rate of change of structure of 5.3%, a recovery rate of permeability is 0.86.

Example 9.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration170/17 (use 155 ml ρ =1100 kg/m3)
Hexane lenteren 5,1/0,51
Gas condensate120/12 (use 167 ml ρ =720 kg/m3)
Peat60/6
An aqueous solution of calcium chloride 20%concentration644,9/64,49 (use 547 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,03 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam - 3,4, stability of the phase composition of 94%, as well as technological properties: pressure breakthrough foam - 30 MPa, pressure release - 270 kPa, the rate of change patterns of 4.9%, a recovery rate of permeability of 0.87.

Example 10.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration170/17 (use 155 ml ρ =1100 kg/m3)
Hexamethylenetetramine1,7/0,17
Diesel fuel120/12 (use 145 ml ρ =830 kg/m3)
TM from the stems of cotton60/6
An aqueous solution of calcium chloride 20%concentration648,3/64,83 (use 549 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0.01 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.8. the stability of the phase composition of 92%, as well as technological properties: pressure breakthrough foam - 22 MPa, pressure release - 250 kPa, the rate of change patterns and 5.6%, a recovery rate of permeability of 0.85.

Example 11.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration170/17 (use 155 ml ρ =1100 kg/m3)
Hexamethylenetetramine3,4/0,34
Gas condensate120/12 (use 167 ml ρ =720 kg/m3)
TM from the chaff60/6
buckwheat 
An aqueous solution of calcium chloride 20%concentration646,6/64,66 (use 548 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,02, respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical pair of the parameters: the ratio of the foam - 3,0, stability of the phase composition of 94%, as well as technological properties: pressure breakthrough foam - 24 MPa, pressure release - 290 kPa, the rate of change patterns of 5.4%, a recovery rate of permeability is 0.86.

Example 12.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration170/17 (use 155 ml ρ =1100 kg/m3)
Hexamethylenetetramine5,1/0,51
Diesel fuel120/12 (use 145 ml ρ =830 kg/m3)
TM from the chaff60/6
buckwheat 
An aqueous solution of calcium chloride 20%concentration644,9/64,49 (use 547 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,03 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam - 3.0, stability of the phase composition of 94%, as well as technological properties: pressure breakthrough foam - 26 MPa, pressure release - 285 kPa, the rate of change patterns of 5.0%, a recovery rate of permeability is 0.86.

Example 13.

otomat 1000 g foamable composition, g/wt.%:

An aqueous solution lstp 25%concentration190/19 (use 173 ml ρ =1100 kg/m3)
Hexamethylenetetramine1,9/0,19
Gas condensate140/14 (use 194 ml ρ =720 kg/m3)
Peat50/5
An aqueous solution of calcium chloride 20%concentration618,1/61,81 (use 524 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0.01 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.9, the stability of the phase composition of 94%, as well as technological properties: pressure breakthrough foam - 18 MPa, pressure release - 240 kPa, the rate of change patterns of 4.9%, a recovery rate of permeability of 0.87.

Example 14.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration190/19 (use 173 ml ρ =1100 kg/m3)
Hexamethylentetramine John3,8/0,38
Diesel fuel140/14 (use 169 ml Á =830 kg/m3)
Peat50/5
An aqueous solution of calcium chloride 20%concentration616,2/61,62 (use 522 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,02, respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam - 3.0, stability of the phase composition of 95%, as well as technological properties: pressure breakthrough foam - 20 MPa, pressure release - 220 kPa, the rate of change patterns of 4.2%, a recovery rate of permeability of 0.87.

Example 15.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration190/19 (use 173 ml ρ =1100 kg/m3)
Hexamethylenetetramine5,7/0,57
Gas condensate140/14 (use 194 ml ρ =720 kg/m3)
Peat50/5
An aqueous solution of calcium chloride 20%concentration614,3/61,43 (use 521 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,03 according to the government. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 3.2, the stability of the phase composition of 96%, as well as technological properties: pressure breakthrough foam - 23 MPa, pressure release - 215 kPa, the rate of change patterns to 4.0%, a recovery rate of permeability - 0,88.

Example 16.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration190/19 (use 173 ml ρ =1100 kg/m3)
Hexamethylenetetramine1,9/0,19
Diesel fuel140/14 (use 169 ml ρ =830 kg/m3)
TM from soybean straw50/5
An aqueous solution of calcium chloride 20%concentration618,1/61,81 (use 524 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0.01 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam - 2,3, stability of the phase composition of 93%, as well as technological properties: pressure breakthrough foam - 15 MPa, pressure release - 265 to the a, the rate of change patterns of 5.2%, a recovery rate of permeability is 0.86.

Example 17.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration190/19 (use 173 ml ρ =1100 kg/m3)
Hexamethylenetetramine3,8/0,38
Gas condensate140/14 (use 194 ml ρ =720 kg/m3)
TM from soybean straw50/5
An aqueous solution of calcium chloride 20%concentration616,2/61,62 (use 522 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,02, respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.7, the stability of the phase composition of 94%, as well as technological properties: pressure breakthrough foam - 17 MPa, pressure release - 245 kPa, the rate of change patterns to 4.6%, a recovery rate of permeability is 0.86.

Example 18.

Prepare 1000 g of a foaming composition, g/wt.%:

An aqueous solution lstp 25%concentration190/19 (use 173 the l ρ =1100 kg/m3)
Hexamethylenetetramine5,7/0,57
Diesel fuel140/14 (use 169 ml ρ =830 kg/m3)
TM from soybean straw50/5
An aqueous solution of calcium chloride 20%concentration614,3/61,43 (use 521 ml ρ =1180 kg/m3)

moreover, the ratio of parts by weight between the specified solution lstp and hexamethylenetetramine 1:0,03 respectively. Conduct all operations as described in example 1.

The obtained foamable composition has the following physico-chemical parameters: the ratio of the foam is 2.9, the stability of the phase composition of 96%, as well as technological properties: pressure breakthrough foam - 19 MPa, pressure release - 230 kPa, the rate of change patterns of 4.2%, a recovery rate of permeability of 0.87.

Compared with the prototype of the inventive foamable composition has increased from 1.3 to 2.1 times the ratio of the foam, the phase stability of the composition is improved by 10-17%, a recovery rate of permeability is increased by 15-19%, the rate of change of the structure of the core is reduced by 10-60%, and the pressure release 1.6 to 3 times.

Thus, the claimed technical solution meets the condition of “novelty, inventive step, industrial applicability, i.e. is the Pat is in.

1. Foamable composition for killing wells consisting of hydrocarbon liquids, mixtures of surface-active substances (surfactants), one component of which is an aqueous solution lignosulfonates reagent 25%concentration, filler vegetable origin and an aqueous solution of calcium chloride 20%concentration, characterized in that it as lignosulfonates reagent contains the technical lignosulphonate powder (lstp), as another component of the mixture of surfactants is hexamethylenetetramine, and as a filler plant origin - peat or grass meal in the following ratio of ingredients, wt.%:

Hydrocarbon liquid12-14
An aqueous solution lstp 25%concentration17-21
Hexamethylenetetramineto 0.17 to 0.63
Peat or grass meal3-6
This solution of calcium chloridethe rest,

moreover, the ratio of wt. hours between the specified solution lstp and hexamethylenetetramine 1: 0,01 - 0,03, respectively.

2. The composition according to claim 1, characterized in that as herbal flour it contains chopped vegetable waste grain loaves of bread, or legumes, or maslich is s, or spinning crops, or a mixture of grasses annual and perennial plants.



 

Same patents:

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

The invention relates to the oil industry and can be used in the operation of deep-pumping of wells in which the reservoir is divided into water-saturated and saturated intervals

The invention relates to the oil industry and can be used in the production of heavy oil using stimulants to reduce its viscosity

The invention relates to the oil industry and is intended to regulate fluid flow, namely in the system maintain reservoir pressure in the well when the regulation of the flow rate of injected water
The invention relates to the field of the oil industry and can find application in various impacts on the reservoir during operation of the well and, in particular, with its perforations, killing for the possibility of repair of wells, emergency shutdown, the intensification of oil production, the alignment of the injectivity profile while maintaining reservoir pressure, for example, flooding, etc

The invention relates to the oil industry and can be used to reduce the viscosity of the oil during lifting with the use of stimulants in the form of a low-viscosity solvent solution, for example low-viscosity oil, heated water or gas condensate

Spring fitting // 2222695
The invention relates to the oil industry and is designed to regulate the flow of fluid in the system for maintaining reservoir pressure at the injection well under the regulation of the flow rate of injected water

The invention relates to the operation of wells and can be used to control oil and gas production well activated by gas injection

The invention relates to the field of oil and gas, in particular liquids for perforating and plugging of wells

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: foam-forming compound for shutting wells contains hydrocarbon liquid, mixture of surfactants, one of components thereof is water solution of lignosulphonate reagent of 25% concentration, herbal filling agent and 20% water solution of calcium chloride, as lignosulphonate agent reagent it contains powder-like technical lignosulphonate, and as other component of surfactant mixture - hexamethylentetramine, and as herbal filling agent - peat or grass flour with following ratio of components in percents of mass: hydrocarbon liquid 12-14, said water solution of technical powder-like lignosulphonate 17-21, hexamethylentetramine 0.17-0.63, peat or grass flour 3-6, said calcium chloride solution - the rest, while relation of mass portions between said water solution of technical powder-like lignosulphonate and hexamethylentetramine is 1: 0.01-0.03 respectively, as grass flour it contains pulverized herbal waste of grain bread production or similar substance.

EFFECT: higher efficiency.

2 cl, 18 ex, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: compound includes water and inhibiting salt, as inhibiting salt contains processed electrolyte - side product during production of magnesium via electrolysis from carnallite, and additionally as reducer of filtering and thickener - carbooximethylcellulose polymer, and as colmatation agent - magnesium oxide with following relation of components in percents of mass: processed electrolyte - side product of magnesium production via electrolysis from carnallite 10.0-15.0, carbooximethylcellulose 2.5-3.0; magnesium oxide 1.0-2.0, water 80.0-86.5.

EFFECT: higher efficiency.

3 tbl

FIELD: oil and gas producing industry, in particular composition for killing of well.

SUBSTANCE: claimed polysaccharide gel contains sweet or mineralized water, polysaccharide gelling agent, boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and mixture of non-ionic and anionic surfactant (complex surfactant). Mixture of water soluble oxyethilated alkylphenols and their sulphoethoxylates in form of sodium salts or salts with triethanolamine is used as complex surfactant in amount of 0.1-0.5 kg on 1000 l of water being the gel base. Polysaccharide gel is obtained by dissolution and hydration of polysaccharide gelling agent in sweet or mineralized water (preferably monovalent ion solution) followed by treatment of obtained polysaccharide solution with aqueous solution including boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and complex surfactant.

EFFECT: well killing composition of improved quality.

2 cl, 6 ex, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes mounting compressor pump in such a way, that input aperture of tail piece was positioned below bed sole. Prior to that water cone in face-adjacent zone is destroyed by draining water through tail piece, connected to lower suck-in valve of compressor pump cylinder, and along behind-pipe space through side suck-in valve of compressor pump cylinder. In case of increase of hydrocarbon contained in drained liquid beginning of water cone destruction is assumed. Draining is continued until destruction of emulsion in water cone, formed in non-homogenous porous environment of bed at limits of hydrocarbon-water and water-hydrocarbon, separation of water and hydrocarbon streams and bringing current water-hydrocarbon contact to initial position. Then during extraction water is drained through tail piece, and hydrocarbon - along behind-pipe space.

EFFECT: higher yield.

3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes preparation of technological liquid - water solution of sylvinite ore mixture with chlorine calcium by solving a mixture of components in hot fresh technical water, drained from oil and water preparation plants or bed water. During solution of sylvinite ore mixture with chlorine calcium in bed water the latter is drained from the well at temperature 60-90°C. Technological liquid is produced with solution density 1.23-1.37 t/m3. Then prepared technological liquid is fed into well shaft a bit lower, oppositely to zone and above ceiling of productive bed with forming of hydraulic column above the latter. Then well shaft to the mouth is filled with water. Value of technological liquid hydraulic column of high density on basis of said mixture, fed into well shaft above ceiling of productive column of technological liquid is taken in amount, necessary and enough from well stopping conditions.

EFFECT: higher efficiency.

6 cl, 1 ex

FIELD: oil and gas production.

SUBSTANCE: water-based composition that can be used for killing of well during pullout of hole and well remedial work as well as for temporary abandonment of well contains, wt %: carboxymethylcellulose3.5-4.5, sodium hydroxide1.5-2.0, copper sulfate 0.3-0.4, and methanol 4.0-16.0.

EFFECT: improved rheological properties of composition and increased lifetime of formed gels.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes serial pumping into well of buffer, blocking and pressing liquid, blocking liquid contains hydrocarbon base, acyclic acid, caustic soda and mineral filler with following relation of components in percents of mass: hydrocarbon base 41-72, acyclic acid 6.1-14.4, caustic soda 4.9-13.0, mineral filler the rest. Hydrocarbon base of blocking liquid is oil or oil processing products. As mineral filler blocking liquid has calcium carbonate with diameter of particles no less than 2 micrometers.

EFFECT: higher efficiency, simplified maintenance, simplified construction.

3 cl, 1 ex

FIELD: oil industry.

SUBSTANCE: at least one acoustic dynamic is mounted immediately on product pipe in oil well and acoustic characteristic of flowing environment flow is determined in product pipe. It is sent into surface controller, using product pipe. Using surface controller flowing substance flowing mode is determined, on basis of which working parameters of oil well are adjusted. Working parameters of oil well can be adjusted to detect Taylor mode of flow. For adjustment of working parameters throttle is used and/or controlled valve of oil well, controlling amount of gas, forces into product pipe. For determining mode of flow of flowing environment artificial neuron net can be used. It is possible is provide energy for acoustic sensor through product pipe. It is possible to determine additional physical characteristics of flowing substance, for example pressure and temperature.

EFFECT: higher efficiency.

3 cl, 22 dwg

FIELD: mining industry.

SUBSTANCE: system has first induction throttle, second induction throttle and controlled switch. Second induction throttle is positioned near second branch of pipeline structure. Controlled switch has two outputs. First switch output is electrically connected to pipeline structure on the side of induction throttles connection, where first and second branches of pipeline structure intersect. Second output of switch is electrically connected to pipeline structure on other side of at least one induction throttle. Pipeline structure can be positioned inside oil well, and can have casing string and operation tubing column. Also described is method for extracting oil products from oil well using said system.

EFFECT: higher efficiency.

4 cl, 10 dwg

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