Foamed gel-like systems for underground reservoirs hydraulic fracturing and procedures for their production and application

FIELD: gas and oil production.

SUBSTANCE: water composition for reservoir hydraulic fracturing contains water, ion-bound gel-like system including charged polymer, oppositely charged foaming agent and gas. The gel-like system and gas are present in amount sufficient for production of ion-bound foamed composition for hydraulic fracturing. Composition contains liquid for hydraulic fracturing including 5.5-7 gpt of the above said gel-like system and de-ionised water. The procedure for production of foamed compositions consists in production of the first composition, the second composition and in adding it to the first one at their specified ratio. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system and proppant and in its pumping into the reservoir. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system, its pumping into the reservoir at pressure of hydraulic fracturing and in pumping proppant after hydraulic fracture.

EFFECT: facilitating reservoir hydraulic fracturing at deficiency of hydration units.

45 cl, 1 tbl

 

Background of the invention

1. The technical field to which the invention relates.

The present invention relates to water expanded onto a composition suitable for hydraulic fracturing containing ion-linked gel-like system, and the compositions are well suited for fracture with little or no hydration systems. The present invention also relates to methods of preparation and use of compositions for fracturing with lack of hydration systems.

More specifically, the present invention relates to water expanded onto a composition suitable for hydraulic fracturing, containing: water, ion-linked gel system containing anionic or cationic polymer and oppositely charged foaming agent, and gas, and the gel-like system and a gas present in a quantity sufficient for the formation of ion-linked foamed compositions for fracturing. These compositions are well suited for hydraulic fracturing, where insufficient or no hydration systems. The present invention also relates to methods of preparation and use of compositions for fracturing with a lack of hydration systems.

2. Description of related prior art

Historically, the use of thickened liquids on what I fracturing in places where there is no hydration units, it was decided by the hydration of linear gel in different places. After hydration of linear gel migration of hydrated linear gel to the location of the break. A more modern approach is aimed at the use of viscoelastic systems (VES), where the gel system is formed of worm-like micellar structures derived from such surfactant systems, as cetyl-tert-butylammonium, which creates a viscosity, as soon as it comes in contact with the saline solution from the well.

In the past, to create a gel-like systems for use in the hydraulic fracturing used a combination of any of anionic Surfactants, cationic Surfactants, nonionic Surfactants and amphoteric Surfactants. The reference to the use of gels containing oppositely charged components for use in hydraulic fracturing, is mentioned only in U.S. patent US 7205262, but this patent does not mention the use of such systems for use in foam systems for hydraulic fracturing.

In the patent US 5169441 encouraged to use the Zeta-potential characteristics of such solid particles as pigments treated with cationic polymers. Patent US 5846308 describes the stabilization of dispersions of rosin for use as a sizing composition by treating it "cationic colloidal koatservata, in which the soda is to press and cationic polymer and anionic surfactants; the end of a sizing composition should have a Zeta-potential of at least 20 millivolts. The preferred cationic polymer is polydiallyldimethyl, sometimes known as poly-DADMAC. The patent US 6315824 describes close koatservatnyh stabilizing system to be used for hydrophobic neonatally of sizing, which may be both liquid and solid. See also US patent 4507210, which offers the correlation of Zeta-potential with certain filtration properties during the processing of oil shale and clay in hydrocarbon extraction; see also US patent 5196401.

Other compositions containing cationic polymer and anionic surfactants, often at high relationship anionic PAVA to the cationic polymer, can be found in patents US 6110451 and US 4948576, and Soaps and other personal care products are described in patents US 6297203, 6221817, patent US 6284230 (which also describes the betaines), in patent US 5137715 patent US 6248317.

In the field of production of hydrocarbons from the earth in the document CA2257699 proposed frac fluid, which combine anionic surfactants, such as ecological sodium and cationic surfactants such as N,N,N-trimethyl-1-octadecanethiol, to obtain a gel, specified as viscoelastic. In CA2257697 for the formation of foam in such compositions is added carbon dioxide. Patent U 4409110 describes compositions for flooding, which may contain cationic polymers and anionic surfactants. Many combinations of Surfactants and other compounds is proposed in patent US 6258859 (WO 98/56497; PCT/US/12067). Cm. also the songs specified as viscoelastic and well treatment in the patent US 6232274 patent US 6194356.

Combinations of cationic polymers, betaine and anionic Surfactants can be derived from the numerous combinations of materials that may are viscoelastic, described in the patent US 5956502 related to compositions used for hair and skin. See also the combination of cationic polymer with an anionic Awami for use in the detergent composition for automatic dishwashing, referred to in the patent US 6281180.

In patents US 7182239 and 7205262 described micellar combination of cationic or anionic polymers and oppositely charged Surfactants, preferably obtained with alcohols C6-C23ratio between them in water environments are established by measuring the Zeta-potential. The resulting gels are suitable for drilling and hydraulic fracturing in the extraction of hydrocarbons, showing excellent stability at low proppant concentration of the polymer and PAVA compared with the previous level.

Although there are foaming system for use in hydraulic fracturing, you cannot have enough hydration units, yet, in this area there is a need for other compositions for fracturing that can be applied to hydraulic fracturing, including layers having insufficient or no hydration systems.

Definitions used in the invention

The term "oppositely charged surfactant" means a surfactant has a charge opposite to the polymer, this surfactant is sometimes called here "protivoyuznym Pavam". Under this, the authors include a surfactant having a charge opposite to the charge of the polymer.

The term "expanded onto" means a composition which, when mixed with the gas forms a stable foam.

The term "ion-linked gel" means a gel formed as a result of interaction between charged polymers and oppositely charged Pavani.

The term "gpt" means gallons per thousand gallons.

The term "ppt" means pounds per thousand gallons.

The essence of the invention

Some embodiments of the present invention provide aqueous compositions suitable for hydraulic fracturing, containing: water, ion-linked gel system containing anionic or cationic polymer and oppositely charged foaming agent, and gas, and the gel-like system and the gas present in sufficient quantity to form ion-linked foamed composition to guide the of orasrv.

Some embodiments of the present invention provide a method of obtaining expanded onto a composition for fracturing of the present invention, includes the step of dissolving anionic or cationic polymer in water and then adding oppositely charged foaming agent, and both components are present in a quantity sufficient for the formation of ion-linked gel-like system. Ion-related or ion-associated gel system contains a lithium-associated charged polymer and oppositely charged foaming agent.

Some embodiments of the present invention provide a method of obtaining a foamed compositions for fracturing of the present invention, includes the step of dissolving anionic or cationic polymer in water and then adding oppositely charged foaming agent, and both components are present in sufficient quantity to education expanded onto ion-linked gel-like composition for fracturing. The gel contains a lithium-associated charged polymer and oppositely charged foaming agent. The method also includes the step of adding the gas in sufficient quantities in the expanded onto the ion-linked gel-like composition for fracturing to obtain spenno the ion-linked gel-like composition for fracturing.

Some embodiments of the present invention provide a method of hydraulic fracturing, including the step of pumping frac fluid containing proppant and gas into a producing formation at a pressure sufficient to rupture the formation and to enhance productivity, where the fracturing fluid includes water, expanded onto the ion-linked gel-like composition for fracturing containing anionic or cationic polymer and oppositely charged foaming agent, and the gel and the gas present in sufficient quantities to form a foamed ion-linked gel-like composition for fracturing and proppant hold the reservoir open after the break.

Some embodiments of the present invention provide a method of hydraulic fracturing, including the step of pumping frac fluid and gas into a producing formation at a pressure sufficient to fracturing and increase productivity, the fracturing fluid contains water, expanded onto the ion-linked gel-like composition for fracturing, including anionic or cationic polymer and oppositely charged foaming agent, and the gel and the gas present in sufficient quantities to form a foamed ion-linked gel-like composition for fracturing the, and propant hold the reservoir open after the break. The method may also include the step of pumping the proppant after the break to keep open the torn seam.

Detailed description of the invention

The inventors have found that can be obtained foamed liquid composition for hydraulic fracturing, which is based on the gels resulting from the interaction between cationic polymers (typically used as stabilizers clay to reduce the swelling of clays/migration stuff) and anionic Pavam (typically used as a foaming agent). Interaction due to ion binding (or electrostatic, or electrovalent bonding) between cationic polymers and anionic foaming agents. Cationic polymers as polydiallyldimethyl, instantly dissolved and hydratious in the water. Once in solution, the polymer can interact with anionic Pavam, such as sodium lauryl sulphate, forming a local gel, which can be foamed with nitrogen or carbon dioxide without using any additional blowing agents. The inventors have found that one variant of implementation of the present compositions is a new composition for fracturing, different from existing compositions can be created from a cat who was polymer clay stabilizer and anionic PAVA or foaming agent, which interact with the formation of a gel product containing electrostatically linked gel-like system and form a high viscosity gel that can be used for fracturing with foam created using nitrogen and CO2.

In some embodiments, the implementation of the used polymers of diallyldimethylammoniumchloride. In other embodiments, the implementation uses the homopolymers of diallyldimethylammoniumchloride. However, when the present invention are cationic polymers that can be used any water-soluble cationic polymer effective for thickening water. In some embodiments, the implementation of the polymers have a molecular weight of at least 7,000 g/mol. Such polymers include homopolymers and copolymers derived from cationic monomers (i.e. at least 20% of monomer units containing cationic functional group, and the rest can be non-functional or non-ionic)such as diallyldimethylammoniumchloride, Methacrylonitrile ammoniacal, acrylonitrilebutadiene, diallyldimethyl ammoniacal, methacryloxypropyltrimethoxysilane, vinylpyridine, universitiesamerican, other cationic polymers or their mixtures or combinations.

In some embodiments, the implementation of the anionic surfactant used is with a cationic polymer, is ammonium lauryl, but can be used any alkylsulfate or sulfonate of an alkali metal, having from 8 to 22 carbon atoms, and sulfates and sulfonates simple alilovic ethers having from 8 to 22 carbon atoms, are used here, the term "protivominniy surfactants and their mixtures or combinations. Can be used commercially available forms of lauryl ammonium containing minor or equal to a substantial number of other similar Surfactants. Can also be used conventional anionic surfactants.

If you are using Minoxidil the promoter, in some embodiments, the implementation of it is laurylamine, but you can use any aminoacid formula R1R2R3N->O, in other embodiments, implementation of R1N(CH3)2->O, where R1is an alkyl group with 8-22 carbon atoms, and R1and R2independently mean alkyl groups containing from 1 to 4 carbon atoms, and their mixtures or combinations. You can use any aminoacid formula R1R2R3N->O, which is defined in the patent US 6258859, which is hereby introduced by reference in its entirety. Cm. the patent US 3303896 and patent US 4108782, which are also introduced by reference in their entirety for the description of aminoxide.

If you are using an amphoteric surfactant, in some vari is ntah implementation, he is a betaine, such as cocamidopropylbetaine, but can be used with other types of amphoteric Surfactants, including aminopropionic and Sultana. You can use any of the surface-active betaines, are listed and described in the patent US 6284230, which is hereby introduced by reference in its entirety.

If you are using anionic polymer, in some embodiments, the implementation uses the copolymers of acrylamide and acrylic acid, ternary copolymers of acrylamide-acrylic acid-AMPS, poly-l-glutamate, polystyrene-sodium sulfonates, polystyrene sulfonates, potassium, copolymers of methacrylamide and acrylic acid, copolymers of acrylamide and methacrylic acid, copolymers of methacrylamide and methacrylic acid, polymers containing acrylamide, acrylic acid, methacrylamide and methacrylic acid, and their mixtures or combinations. This can be done with or without promoter gel, but where the promoters of the gel is not applied, the concentration of the anionic polymer should be significantly higher than where you used the promoter of the gel.

Suitable reagents

Suitable cationic polymers include polyamine, Quaternary derivatives of ethers of cellulose, Quaternary derivatives of the guar resins, homopolymers and copolymers with at least 20 mol% of dimethyldiallylammonium (DMDAAC), homopolymers and copolymers of methacry is aminopropyltrimethoxysilane (MAPTAC), the homopolymers and copolymers of acrylamidophenylboronic (APTAC), homopolymers and copolymers of methacryloyloxyethyl of ammoniaand (METAC), homopolymers and copolymers of acryloyloxy of trimethylammoniumchloride (AETAC), homopolymers and copolymers of methacryloxypropyltrimethoxysilane (METAMS), and Quaternary derivatives of starch and their mixtures or combinations.

Suitable anionic polymers include homopolymers and copolymers of acrylic acid (AA), homopolymers and copolymers of methacrylic acid (MAA), homopolymers and copolymers of 2-acrylamide-2-methylpropanesulfonic acid (AMPSA), homopolymers and copolymers of N-methacrylamide-N,N-dimethylaminoethanol acid, N-acrylamidoethyl-N,N-dimethylaminoethanol acid, N-methacryloyloxyethyl-N,N-dimethylaminoethanol acid and N-acryloyloxy-N,N-dimethylaminoethanol acid and their mixtures or combinations.

Anionic surfactants suitable for use with cationic polymers include alkyl-, aryl - or alkylarylsulfonates, alkyl-, aryl - or alkylaminocarbonyl or alkyl-, aryl - or alkylarylsulfonate. In some embodiments, the implementation of the alkyl parts contain from about 1 to about 18 carbon atoms, aryl fragments contain from about 6 to about 12 carbon atoms and alcylaryl fragments are from about 7 to about 30 and the Ohm carbon. Typical groups are propyl, butyl, hexyl, decyl, dodecyl, phenyl, benzyl, and linear or branched alkylbenzene derivatives, carboxylates, sulfates and sulfonates. Included sulfates simple alilovic esters, alkalicarbonate, alkylacrylate, alkylsulfonate, N-allylcarbamate, alkylphosphate, phosphates simple alilovic ethers, carboxylates simple alilovic esters, alpha-olefin, the sulfonates and asymmetry, in particular their sodium, magnesium, ammonium and mono-, di - and triethanolamine salts or their mixtures or combinations. The alkyl and acyl groups typically contain from 8 to 18 carbon atoms and may be unsaturated. Sulfates simple alilovic esters, phosphates simple alilovic esters and carboxylates simple alilovic esters may contain from one to 10 ethylenoxide or propylenoxide chains on the molecule. In some embodiments, the implementation of sulfates simple alilovic esters, phosphates simple alilovic esters and carboxylates simple alilovic esters contain 2-3 ethylenoxide link on the molecule. Examples of suitable anionic Surfactants include lauryl ammonium, laurelthirst ammonium, laurylsulphate ammonium, dodecylbenzenesulfonate sodium, dodecylbenzensulfonate triethanolamine, triethanolamine dodecyl sulphate, Cocoyl isetionate ammonium lauryl of isethionate and N-laurylsarcosine ammonium, and their mixtures or combinations. In other embodiments, the implementation of some of the anionic Surfactants can be sodium, potassium, cesium Pavani or other similar anionic Pavani or mixtures of these Surfactants on the basis of alkali metals with ammonium Pavani.

Cationic surfactants suitable for use in anionic polymers include surfactants based on Quaternary ammonium compounds of the formula X-N+R1R2R3where R1, R2and R3independently selected from hydrogen, aliphatic groups containing from about 1 to about 22 carbon atoms, or aromatic, aryl, alkoxy, polyoxyalkylene, alkylamide, hydroxyalkyl or alcylaryl group having from about 1 to about 22 carbon atoms; and X is an anion, anion selected from halogen, acetate, phosphate, nitrate, sulfate, alkylsulfate radicals (for example, methyl sulfate and ethyl sulfate), tosilata, lactate, glycolate, citrate and and their mixtures or combinations. Aliphatic group, in addition to carbon atoms and hydrogen, and may contain hydroxy groups, ether linkages, and other groups, such as the substituents is a hydroxyl or amino group (for example, alkyl groups can contain polietilenglikolya and polypropylenglycol fragments). More long-chain aliphatic group, for example containing the E. about 12 carbon atoms or more, can be saturated or unsaturated. In other embodiments, implementation of R1means an alkyl group having from about 12 to about 18 carbon atoms; R2selected from H or alkyl groups having from about 1 to about 18 carbon atoms; R3and R4independently selected from H or alkyl groups having from about 1 to about 3 carbon atoms; and X is as described above.

Lower alcohols suitable for use in the present invention include, without limitation, alcohols of General formula ROH, where R is a linear or branched carmelina group containing from 1 to 5 carbon atoms, where one or more carbon atoms may be replaced by oxygen atom, nitrogen or sulfur and one or more hydrogen atoms may be substituted by halogen atom, alkoxy group, amide group or any other group which may substitute the hydrogen atom and does not have a negative impact on the properties of alcohol. In some embodiments, the implementation of the alcohols have the General formula CnH2n+2OH, where n is an integer of about 1 to about 5. In some embodiments, implementation, n is an integer of 2 to 4. In another embodiment, n is an integer of 3 to 4. In another embodiment, n is an integer equal to 3.

Under the promoter of the gel, the authors and the attainment mean betaine, sustain or hydroxysultaine, or aminoxide.

Examples of betaines include the higher alkylbetaine, such as cocodimethylamine, lauryldimethylamine, lauryldimonium alpha carboxymethylation, satellitetelevision betaine, satellitetelevision, lauryl bis-(2-hydroxyethyl)carboxymethylation, realtimer gamma carboxypropylbetaine, lauryl bis-(2-hydroxypropyl)alpha-carboxymethylation, cocodimethylamine, lauryldimonium sulfomethylation, lauryl bis-(2-hydroxyethyl)sulfopropyl, aminobutane and aminosulfonates (and radical RCONH(CH2)3linked to the nitrogen atom of the betaine), olivetan and cocamidopropylbetaine, and their mixtures or combinations. Examples of Sultanov and hydroxysultaine include such materials as cocamidopropylbetaine.

Amphoteric surfactants suitable for use with cationic polymers or anionic polymers include surfactants, broadly described as derivatives of aliphatic secondary and tertiary amines in which the aliphatic radical may be linear or branched chain, and one of the aliphatic substituents contains from about 8 to about 18 carbon atoms and one contains an anionic soluble in water group, such as carboxy, sulfonate, sulfate, phosphate, or phosphonate, and their mixtures or combinaciones amphoteric surfactants include derivatives of aliphatic secondary and tertiary amines, in which the aliphatic radical can be straight or branched chain, and one of the aliphatic substituents contains from about 8 to about 18 carbon atoms and one contains an anionic soluble in water group, such as carboxy, sulfonate, sulfate, phosphate, or phosphonate, and their mixtures or combinations. Examples of compounds falling within this definition are 3-dodecylthiophene sodium 3-dodecylbenzenesulfonate sodium, their mixtures or combinations.

Suitable aminoxide include, without limitation, cocamidopropylbetaine and other compounds of the formula R1R2R3N->O, where R3means hydrocarbon or substituted hydrocarbon having from about 8 to about 30 carbon atoms, and R1and R2independently mean hydrogen, hydrocarbon or substituted hydrocarbon having up to 30 carbon atoms, and their mixtures or combinations. In other embodiments, implementation of R3means an aliphatic or substituted aliphatic hydrocarbon having at least about 12 to about 24 carbon atoms, and their mixtures or combinations. In other embodiments, implementation of R3there aliphatic group containing at least about 12 carbon atoms to about 22, and their mixtures or combinations. In other embodiments, the implementation of this aliphatic group, tereasa at least about 18 and not more than about 22 carbon atoms, and their mixtures or combinations.

Suitable gases for expansion expanded onto ion-linked gel-like compositions include, without limitation, nitrogen, carbon dioxide or any other gas suitable for use in hydraulic fracturing, or their mixtures or combinations.

The ranges of composition

In some embodiments, the implementation of the compositions of the present invention include aqueous ion-linked gels. The gels contain water and (a) from about 0.5 wt.% up to about 20 wt.% charged polymer and (b) from about 0.1 wt.% to about 50 wt.% oppositely charged PAVA or foaming agent. Gels may also include (c) from about 0.01 wt.% up to about 20 wt.% betaine. Gels may also include (d) from about 1 wt.% to about 35 wt.% aminoxide. Gels may also include (e) from about 0.1 wt.% up to about 20 wt.% lower alcohol.

When using anionic polymer compositions according to the invention include aqueous gels containing water and, by weight in the calculation of the water, (a) from about 1 wt.% up to about 20 wt.% anionic polymer and (b) from about 0.5 wt.% to about 50 wt.% cationic PAVA or foaming agent. Gels may also include (c) from about 0.1 wt.% up to 20 wt.% betaine. Gels may also include (d) from 2 wt.% to about 35 wt.% aminoxide. Gels may also include (e) from about 1 wt.% up to about 20 wt.% lower sleep is the same.

When using a cationic polymer compositions according to the invention include aqueous gels containing water and, by weight in the calculation of the water, (a) from about 2.5 wt.% up to about 20 wt.% cationic polymer and (b) from about 1 wt.% to about 50 wt.% anionic PAVA or foaming agent. Gels may also include (c) from 1 wt.% up to about 20 wt.% betaine. Gels may also include (d) from about 5 wt.% to about 35 wt.% aminoxide. Gels may also include (e) from about 2 wt.% up to about 20 wt.% lower alcohol.

The present invention relates also to a method for producing an aqueous gel comprising adding to the water when mixing (a) from about 0.5 wt.% up to about 20 wt.% charged polymer. After mixing in the charged polymer solution under stirring is added (b) from about 0.1 wt.% to about 50 wt.% oppositely charged PAVA to form expanded onto ion-linked gel. Expanded onto the ion-linked gels can later lather, using gas, getting foamed ion-linked gel-like composition for fracturing, which can then be directed into the reservoir for hydraulic fracturing.

In addition, the present invention relates to a method of fracturing a subterranean formation, including the formation of the gel or koatservata what is described here, and the injection of gel or coats rata in the wellbore, together with propanda and at a pressure sufficient to break the formation. Proppants suitable for the present invention include all of the usual or conventional proppants fillers, such as sand, shells and other hard solids. The gel can be used in the absence of the usual salts, forming a saline solution. The gels are water-based, used for hydraulic fracturing and other well treatment, usually used guar gum, cellulose or resin, which depend on chemical bonding and are shear sensitive. The compositions of the present invention can be easily pumped pump, but when applied they, however, will be to form strong gels. Although the compositions of the present invention are intended for hydraulic fracturing, they can also be applied during drilling, and gel-like systems are used in a concentration range of from about 0.25% to about 1% or more by weight, regardless of whether created intentionally foam or not. Fracturing a subterranean formation of a gel-like system of the present invention are typically used with a range of concentrations of the gel from about 0.75% to about 1.5 wt.% or more in frac fluid (which will usually include proppant). Gel compositions according to the invention is compatible with objnamespace solutions and liquid compositions for fracturing. Together with them can be used reagents for the destruction of the gels, and destructive reagents interact with the ion-bound charged polymer and oppositely charged foaming agent.

Experimental part inventions

General method of preparation of compositions

Preparation of additive A

Additive A was prepared by adding with mixing 16.5 wt.% solution (16,25%wt.) polydiallyldimethyl (pDADMAC), 2,63% wt. cocamidopropylbetaine and 3.46 wt.% cotaminated to 77,66% wt. deionized water.

Preparation of additive B

Additive B was prepared by adding with mixing to 25.0 wt.% amarylamarylwhat and 10 wt.% isopropyl alcohol (IPA) to 65 wt.% deionized water.

Preparation of expanded onto the ion-linked gel compositions for fracturing

Added to this the amount of additive A in water to obtain the desired concentration of additive A. To this solution of the additive A is added such an amount of additive B to obtain expanded onto the ion-linked gel-like composition for fracturing. The amount of additive A generally ranges from about 5 gpt to about 50 gpt, and the amount of additive B typically ranges from about 0.5 gpt to about 20 gpt. In some embodiments, the implementation of a number of additives to A range from about 7.5 gpt to about 45 gpt, and count is the number of additive B typically ranges from about 1 gpt to about 15 gpt. In other embodiments, the implementation of a number of additives to A range from about 10 gpt to about 40 gpt, and the amount of additive B typically ranges from about 1 gpt to approximately 12.5 gpt. In other embodiments, the implementation of a number of additives to A range from about 10 gpt to about 40 gpt, and the amount of additive B typically ranges from about 2.5 gpt to about 10 gpt. In some embodiments, the implementation of the ratio of additive A and additive B is from about 2:1 to about 6:1. In other embodiments, implementation of the ratio of additive A and additive B is from about 3:1 to about 5:1. In other embodiments, implementation of the ratio of additive A and additive B is approximately 4:1. In other embodiments, the implementation of the gel system is present in frac fluid in an amount of from about 5.5 gpt to about 70 gpt at the specified ratio of additive A and additive b In other embodiments, the implementation of the gel system is present in frac fluid in an amount of from about 7.5 gpt to about 60 gpt at the specified ratio of additive A and additive b In other embodiments, the implementation of the gel system is present in frac fluid in an amount of from about 11 gpt to approximately 52.5 gpt at the specified ratio of additive A and additive b In other embodiments, the implementation of the gel system is present in the liquid for hydrometry is and in the amount of from about 12.5 gpt to about 50 gpt at the specified ratio of additive A and additive b

A common way of testing foam

The desired amount of additive A was added in 100 ml of tap water and mixed for 10 seconds with the mixer Hamilton Beach at 7000 rpm Then the resulting solution was added the desired amount of additive B and mixed for one minute in the mixer Hamilton Beach at 7000 rpm-Formed foam was poured into a graduated cylinder and measured the height of the foam. Half-time was defined as the time required to reduce the amount of foam up to 50% of its original height.

Table 1
Test foaming in salt water
Additive A (gpt)Additive B (gpt)The half-decay time (min:sec)The height of foam (ml)Viscosity
r1:B1 @ 511-1(SDR)
4010> 4 hours30073,0
256,2> 4 hours40029,3
205,0&t; 4 hours400of 21.9
of 17.54,4> 4 hours32016,2
15the 3.88:1330010,5
102,56:012805,0

All quoted material here introduced by reference. Although the invention has been described with respect to its disclosed embodiments, a specialist after study of this specification may appreciate changes and modification that may be made, without departing from the nature and scope of the invention as described above and claimed below in the formula.

1. The aqueous composition suitable for hydraulic fracturing, containing:
water,
ion-linked gel-like system, including:
the charged polymer and
oppositely charged foaming agent, and
gas,
moreover, gel-like system and a gas present in a quantity sufficient for the formation of ion-linked foamed compositions for fracturing.

2. The composition according to claim 1, where the gel system in addition, contains betaine.

3. The composition according to claim 1, where the gel-like system, in addition, contains aminexil.

4. The composition according to claim 1, where the gel-like system, in addition, contains a lower alcohol.

5. The composition according to claim 1, where the gel system comprises: from about 0.5 wt.% up to about 20 wt.% charged polymer and from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent.

6. The composition according to claim 2, where the gel system comprises: from about 0.5 wt.% up to about 20 wt.% charged polymer, from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent and from about 0.01 wt.% up to about 20 wt.% betaine.

7. The composition according to claim 3, where the gel system comprises: from about 0.5 wt.% up to about 20 wt.% charged polymer, from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent, from about 0.01 wt.% up to about 20 wt.% betaine and from about 1 wt.% to about 35 wt.% aminoxide.

8. The composition according to claim 4, where the gel-like system, in addition, contains: from about 0.5 wt.% up to about 20 wt.% charged polymer, from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent, from about 0.01 wt.% up to about 20 wt.% betaine, from about 1 wt.% to about 35 wt.% aminoxide and from about 0.1 wt.% up to about 20 wt.% lower alcohol.

Campsite according to claim 4, where the gel system comprises: from about 1 wt.% up to about 20 wt.% anionic polymer, from about 0.5 wt.% to about 50 wt.% cationic foaming agent, from about 0.1 wt.% up to about 20 wt.% betaine, from about 2 wt.% to about 35 wt.% aminoxide and from about 1 wt.% up to about 20 wt.% lower alcohol.

10. The composition according to claim 4, where the gel system comprises: from about 2.5 wt.% up to about 20 wt.% cationic polymer, from about 1 wt.% to about 50 wt.% anionic foaming agent, from about 1 wt.% up to about 20 wt.% betaine, from about 5 wt.% to about 35 wt.% aminoxide and from about 2 wt.% up to about 20 wt.% lower alcohol.

11. The composition according to claim 1 where the cationic polymers include polyamine, Quaternary derivatives of ethers of cellulose, Quaternary derivatives of the guar resins, homopolymers and copolymers with at least 20 mol.% dimethyldiallylammonium (DMDAAC), homopolymers and copolymers of methacrylamide of trimethylammoniumchloride (MARTHA), homopolymers and copolymers of acrylamidophenylboronic (ARTHAS), homopolymers and copolymers of methacryloxypropyltrimethoxysilane (METAS), homopolymers and copolymers of acryloyldimethyltaurate (AETAS), homopolymers and copolymers methacryloyloxyethyl methyl sulfate (METAMS) and Quaternary deposition the major starch, and their mixtures or combinations.

12. The composition according to claim 1 where the anionic polymers include homopolymers and copolymers of acrylic acid (AA), homopolymers and copolymers of methacrylic acid (MAA), homopolymers and copolymers of acrylamide-2-methylpropanesulfonic acid (AMPSA), homopolymers and copolymers of N-methacrylamide-N,N-dimethylaminoethanol acid, N-acrylamidoethyl-N,N-dimethylaminoethanol acid, N-methacryloyloxyethyl-N,N-dimethylaminoethanol acid and N-acryloyloxy-N,N-dimethylaminoethanol acid and their mixtures or combinations.

13. The composition according to claim 1 where the anionic foaming agents include alkyl-, aryl - or alkylarylsulfonates, alkyl-, aryl - or alkylaminocarbonyl, or alkyl-, aryl - or alkylarylsulfonate; in certain embodiments of the implementation of the alkyl parts contain from about 1 to about 18 carbon atoms, aryl fragments contain from about 6 to about 12 carbon atoms, and alcylaryl fragments contain from about 7 to about 30 carbon atoms; typical groups are propyl, butyl, hexyl, decyl, dodecyl, phenyl, benzyl, and linear or branched alkylbenzene derivatives, carboxylates, sulfates and the sulfonates.

14. The composition according to claim 1 where the anionic foaming agents contain sulfates simple alilovic esters, alkalicarbonate, alkylacrylate, alkylsulfates Kzinti, N-allylcarbamate, alkylphosphate, phosphates simple alilovic ethers, carboxylates simple alilovic esters, alpha-olefin, the sulfonates and asymmetry, in particular their sodium, magnesium, ammonium and mono-, di - and triethanolamine salt, or mixtures thereof, or a combination, and the alkyl and acyl groups contain from 8 to 18 carbon atoms and is saturated or unsaturated, and sulfates simple alilovic esters, phosphates simple alilovic esters and carboxylates simple alilovic esters may contain from one to 10 units of ethylene oxide or propylene oxide in the molecule.

15. The composition according to claim 1 where the cationic foaming agents include surfactants based on Quaternary ammonium compounds of the formula X-N+R1R2R3where R1, R2and R3independently selected from hydrogen, aliphatic groups containing from about 1 to about 22 carbon atoms, or aromatic, aryl, alkoxy, polyoxyalkylene, alkylamide, hydroxyalkyl or alcylaryl group having from about 1 to about 22 carbon atoms; and X represents an anion, anion selected from halogen, acetate, phosphate, nitrate, sulfate, alkylsulfate radicals, tosilata, lactate, citrate and glycolate, and mixtures or combinations, and the aliphatic group may include, in addition to carbon atoms is kind and hydrogen, ether linkages, and other groups, such as the substituents of hydroxyl or amino groups, and more long-chain aliphatic group having at least 12 carbon atoms, may be saturated or unsaturated.

16. The composition according to item 15, in which R1is an alkyl group having from about 12 to about 18 carbon atoms; R2selected from H or alkyl groups having from about 1 to about 18 carbon atoms; R3and R4independently selected from H or alkyl groups having from about 1 to about 3 carbon atoms; and X is as described above.

17. The composition according to claim 1, in which the lower alcohols include alcohols of General formula ROH, where R is a linear or branched carmelina group having from 1 to 5 carbon atoms, where one or more carbon atoms may be replaced by oxygen atom, nitrogen or sulfur, and one or more hydrogen atoms may be substituted by a halogen atom, alkoxygroup, amide group or any other group which may substitute the hydrogen atom and does not have a negative impact on the properties of alcohol.

18. The composition according to claim 1, where the lower alcohols have the General formula CnH2n+2OH, where n is an integer of about 1 to about 5.

19. The composition according to p, where n is an integer of 2 to 4.

20. The composition according to p, where n eats is an integer, of 3 to 4.

21. The composition according to p, where n is an integer equal to 3.

22. The composition according to claim 1, where the betaines include cocodiesel carboxymethylation, lauryldimethylamine, lauryldimethylamine, acidimeter carboxymethylation, satellitetelevision, lauryl bis-(2-hydroxyethyl)carboxymethylation, realtimer gamma carboxypropylbetaine, lauryl bis-(2-hydroxypropyl)alpha-carboxymethylation, cocodimethylamine, lauryldimethylamine, lauryl bis-(2-hydroxyethyl)sulfopropyl, aminobutane and aminosulfonates, and radical RCONH(CH2)3attached to the nitrogen atom of the betaine, olivetan and cocamidopropylbetaine and their mixtures or combinations.

23. The composition according to claim 1, where aminoxide include cocamidopropylbetaine and other compounds of the formula R1R2R3N->O, where R3means hydrocarbon or substituted hydrocarbon having from about 8 to about 30 carbon atoms, and R1and R2independently mean hydrogen, hydrocarbon or substituted hydrocarbon having up to 30 carbon atoms, and their mixtures or combinations.

24. The composition according to claim 1, where the gases include nitrogen, carbon dioxide or any other gas suitable for use in the hydraulic fracturing, or their mixtures or combinations.

25. The composition, including the maintenance: fluid fracturing, comprising from about 5.5 gpt to about 70 gpt gel system, and the gel system includes: a first amount of the first additional songs, including: about 16.5 wt.% solution (16,25%wt.) polydiallyldimethyl (pDADMAC), about 2,63% wt. cocamidopropylbetaine, approximately 3.46 wt.% cotaminated and about 77,66% wt. deionized water; and a second amount of the second additional songs, including: about to 25.0 wt.% lauryl ammonium, about 10 wt.% isopropyl alcohol (IPA) and about 65 wt.% deionized water, and the ratio of the first additive to the amount of the second additive is from about 2:1 to about 6:1.

26. The composition according A.25, where the first number ranges from about 5 gpt to about 50 gpt, and the second number varies from about 0.5 gpt to about 20 gpt.

27. The composition according A.25, where the first number ranges from about 7.5 gpt to about 45 gpt, and the second number ranges from about 1 gpt to about 15 gpt.

28. The composition according A.25, where the first number ranges from about 10 gpt to about 40 gpt, and the second number ranges from about 1 gpt to approximately 12.5 gpt.

29. The composition according A.25, where the first number ranges from about 10 gpt to about 40 gpt, and the second number varies from about 2.5 gpt to about 10 gpt.

30. Songs which I A.25, where the ratio is from about 3:1 to about 5:1.

31. The composition according A.25, where the ratio is approximately 4:1.

32. The composition according A.25, where the gel system is present in the range from approximately 12.5 gpt to about 50 gpt.

33. The method of hydraulic fracturing, including the stages of: education frac fluid containing from about 5.5 gpt to about 70 gpt ion-linked gel-like system and a sufficient amount of proppant to hold open the cracks obtained in the reservoir fracturing, pumping frac fluid and gas into the formation at sufficient pressure to break the formation and to enhance productivity, and gel and gas are present in quantities sufficient for the formation of foamed ion-linked gel-like composition for fracturing, and propant hold the reservoir open during and/or after fracturing.

34. The method according to p, where the gel-like system, in addition, contains betaine.

35. The method according to p, where the gel-like system, in addition, contains aminexil.

36. The method according to p, where the gel-like system, in addition, contains a lower alcohol.

37. The method according to p, where the gel system comprises: from about 0.5 wt.% up to about 20 wt.% charged polymer and from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent.

38. Pic is b-34, where the gel system comprises: from about 0.5 wt.% up to about 20 wt.% charged polymer, from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent, from about 0.01 wt.% up to about 20 wt.% betaine.

39. The method according to p, where the gel system comprises: from about 0.5 wt.% up to about 20 wt.% charged polymer, from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent, from about 0.01 wt.% up to about 20 wt.% betaine and from about 1 wt.% to about 35 wt.% aminoxide.

40. The method according to p, where the gel-like system, in addition, contains: from about 0.5 wt.% up to about 20 wt.% charged polymer, from about 0.1 wt.% to about 50 wt.% oppositely charged foaming agent, from about 0.01 wt.% up to about 20 wt.% betaine, from about 1 wt.% to about 35 wt.% aminoxide and from about 0.1 wt.% up to about 20 wt.% lower alcohol.

41. The method according to p, where the gel system comprises: from about 1 wt.% up to about 20 wt.% anionic polymer, from about 0.5 wt.% to about 50 wt.% cationic foaming agent, from about 0.1 wt.% up to about 20 wt.% betaine, from about 2 wt.% to about 35 wt.% aminoxide and from about 1 wt.% up to about 20 wt.% lower alcohol.

42. The method according to p, where the gel system comprises: from about 2.5 wt.% up to about 20 wt.% to tinago polymer, from about 1 wt.% to about 50 wt.% anionic foaming agent, from about 1 wt.% up to about 20 wt.% betaine, from about 5 wt.% to about 35 wt.% aminoxide and from about 2 wt.% up to about 20 wt.% lower alcohol.

43. The method of hydraulic fracturing, including the steps of: pumping frac fluid and gas into a producing formation at a pressure sufficient to rupture the formation and to enhance productivity, the fracturing fluid contains expanded onto the ion-linked gel-like composition for fracturing, including anionic or cationic polymer and oppositely charged foaming agent, and the gel and the gas present in quantities sufficient for the formation of foamed ion-linked gel-like composition for fracturing and injection of proppant after fracturing to hold open the torn seam.

44. A method of obtaining a foamed compositions for fracturing, containing the step of dissolving anionic or cationic polymer in water and then adding oppositely charged foaming agent, and these two components are present in sufficient quantity to education expanded onto ion-linked gel-like composition for fracturing.

45. The method of obtaining expanded onto a composition for fracturing, comprising the steps: formed who I am, by mixing, the first additional compositions containing about 16.5 wt.% solution (16,25%wt.) polydiallyldimethyl (pDADMAC), about 2,63% wt. cocamidopropylbetaine, approximately 3.46 wt.% cotaminated and about 77,66% wt. deionized water, education, by mixing, the second additional compositions containing about to 25.0 wt.% lauryl ammonium, about 10 wt.% isopropyl alcohol (IPA) and about 65 wt.% deionized water, adding a second quantity of the second composition to the first amount of the first additional composition with respect to the first Supplement to the second addition of from about 2:1 to about 6:1.



 

Same patents:

FIELD: gas and oil production.

SUBSTANCE: procedure for treatment of underground formation with processing thickened liquid consists in: mixing water, carbonyl containing first compound and amine containing second compound. The carbonyl containing first compound contains at least one carbonyl group and corresponds to either gel forming agent or to modifying agent. The amine containing second compound contains at least one amine group and corresponds to a gel forming agent when the carbonyl containing first compound is a modifying agent, and to a modifying agent when the carbonyl containing first compound corresponds to the gel forming agent. The gel forming agent corresponds to at least one following compounds: polysaccharide, natural polymer, bio-polymer or synthetic polymer and the modifying agent corresponds to at least one of the following compounds: halogenide, epoxide, polysaccharide, natural polymer, bio-polymer or synthetic polymer. Further, the procedure consists in interaction between at least one carbonyl group of the first compound and at least one amine group of the second compound with formation of modifying bond and production of the modified gel forming agent and in introduction or thickened liquid into a section of an underground formation. The procedure for formation of break of a section of the underground formation by means of processing thickened liquid includes the above said stages. Also, processing thickened liquid is pumped into a section of the underground formation under pressure sufficient for creation or expansion of at least one break in it.

EFFECT: production of modified thickened agents.

16 cl

FIELD: gas and oil production.

SUBSTANCE: procedure for preparing propping agent with coating consists in application of coating on surface of granule. Coating consists of binding and fibre, part of which projects beyond borders of a binding layer. Ratio between length of each fibre and diametre of granule is from 0.06 to 0.44. Additionally, there is carried out treatment with silicon-organic or fluoric-carbon oil-wetting agent at amount from 0.5 to 10% of fibre weight. Propping agent is prepared by the above described procedure. The invention is developed in dependent points of formula.

EFFECT: reduced water-cut of hydrocarbon raw stock at operation of well.

9 cl, 8 ex, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure for stimulation and stabilisation of region of underground bed consists in: delivery of acidulous liquid into region of underground bed and allowing acid, at least partially, to dissolve part of region of underground bed, in pumping cementing liquid containing agent increasing stickiness and including water stickiness increasing agent, in delivery of liquid for successive flushing into region of underground bed and in pumping replacing liquid into underground bed directly upon stage of delivery of acidulous liquid into region of underground bed.

EFFECT: increase and maintaining well output.

55 cl

Deflecting fluid // 2433157

FIELD: mining.

SUBSTANCE: deflecting fluid for temporary sealing of the upper and lower parts of a treated interval in an underground formation by means of supply of the deflecting fluid into holes defined by a drill hole, being hydraulically connected with the treated interval, besides, the deflecting fluid includes a water bearing fluid, which substantially contains water, where particles of the first deflecting agent and particles of the second deflecting agents are dispersed, where the particles of each of the first and second deflecting agents include particles of the propping agent substrate, having a water-soluble polymer coating, besides, the particles of the first deflecting agent have density, which is higher than the density of the water bearing fluid, while the particles of the second deflecting agent have the density, which is less than the density of the water bearing fluid, where the water-soluble polymers of each of the first and second deflecting agents are independently selected from the group that consists of collagen of type I, collagen of type II, collagen of type III, collagen of type IV, collagen of type V and their mixtures. The method to prepare the treated interval in the underground formation for formation fracturing to increase intensification of flow from the treated interval by means of formation fracturing, includes injection of the above specified deflecting fluid into the treated interval, which results in the fact that the particles of the first deflecting agent are deposited in the lower part of the treated interval, forming a temporary lower border, which substantially seals the lower part of the treated interval relative to the flow of liquid via this lower border, and the particles of the second deflecting agent rise in the upper part of the treated interval, forming a temporary upper border, which substantially seals the upper part of the treated interval relative to the flow of liquid through this upper border.

EFFECT: intensification of flow into one or many intervals in underground drill holes as a result of deflection of working fluids flow to process a drill hole in a certain direction.

16 cl, 2 ex, 3 dwg

FIELD: oil and gas production.

SUBSTANCE: spherical ceramic propping filler designed for oil or gas wells hydraulic fracturing is characterised with recesses on its surface. The procedure for forming recesses on surface of spherical ceramic propping filler consists in stages of drying, crumbling and granulation of raw stock with a successive stage of granulated material sintering. Also, the procedure does not include stages of calcination before the said stage of granulation. Here is also disclosed the procedure for oil or gas wells hydraulic fracturing where the above described propping filler is used as propping filler for hydraulic fracturing. The invention is developed in dependent points of formula.

EFFECT: raised efficiency of extraction of oil or gas from wells.

13 cl, 4 tbl, 7 dwg

FIELD: mining.

SUBSTANCE: using a composition of a sealant emulsion to reduce diagenesis of mineral surface in an underground layer, where the composition of the sealant emulsion contains a water fluid; a surfactant and a sealant, at the same time the specified emulsion has a water external phase and an oil internal phase, the sealant is a non-water additive, which gives stickiness, selected from a group that contains of polyamides, polyesters, polycarbonates, polycarbamates, natural resins and their combinations, or resin selected from a group made of a double-component resin on the epoxide basis, resins on the basis of furans, phenol-based resins and resins on the basis of phenol/phenol-formaldehyde/furfuryl alcohol, besides, the composition of the sealant emulsion is introduced into the underground layer, and multiple particles are coated with a sealant emulsion to produce multiple particles coated with a sealant emulsion. The invention is developed in the formula subclaims.

EFFECT: facilitation of works performance, transportation and cleaning.

6 cl, 3 dwg, 2 ex, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: modifier reducing time for recovery upon effect of shearing force of liquid medium on base of viscoelastic surface-active substance for process treatment of underground bed of deposit corresponds to fibrous substance or substance in form of particles, or their mixture in concentration sufficient for time of recovery upon effect of shearing force equal to 60 seconds or less, where concentration amounts to approximately 0.0001% to approximately 5 % wt of total weight of liquid medium. The inventions are developed in dependent points.

EFFECT: facilitation of time for recovery of fluid medium upon effect of shear force equal to 60 seconds or less.

20 cl, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure for placement of solid phase in specified place of rock thickness accessible through bore of well consists in: pumping colloid of hydrolysed alkoxides of metals to bore of well to specified place in thickness of rock, in retaining colloid in specified place during gelation and solidification of colloid resulted from polymerisation of hydrolysed alkoxides of metals. Sols of metal alkoxide can be stabilised either with a surface active substance or with inter-phase polymers. Into colloid of hydrolysed metal alkoxides there can be added micelle forming surface active substance around which there is formed solidified porous matrix. Further, surface active substance is washed out. The invention is developed in dependent points.

EFFECT: reduced abrasive effect on well equipment, reduced friction resulted in decreased power consumption for pumping flow of suspended material.

17 cl, 7 dwg

FIELD: chemistry.

SUBSTANCE: ceramic element contains sintered base and layer, where the coefficient of thermal expansion (CTE) of the base is higher than that of the layer and the base exerts compression force on the layer. The method of making said ceramic element involves moulding the base and applying the layer on its surface, exposure to a thermal cycle and exerting the compression force of the base on the layer. A method of breaking a geological formation using the disclosed ceramic element is also disclosed.

EFFECT: high strength of the ceramic element.

41 cl, 4 tbl, 10 dwg

FIELD: mining.

SUBSTANCE: in method of hydraulic fracturing and attachment of formations formed with loose uncemented rocks the fracturing fluid is pumped to productive formation through tubing string and contains water solution of average-module liquid glass consisting of the following, wt %: sodium silicate 17-20, water 80-83, and acetone-alcohol solution consisting of water-free acetone and methyl alcohol in volume ratio of 0.4:1, at the following component ratio, wt %: the above solution of liquid glass 75-85, the above acetone-alcohol solution 15-25; when hydraulic fracturing of formation is achieved in fracturing fluid there in addition introduced is propping agent in quantity of 100-150 kg per 1 m3 of fluid to strengthen loose uncemented rocks of manifold in bottom-hole zone of productive horizon; after pumping of design amount of fracturing fluid with propping agent is completed to the formation there pumped is water-alcohol solution of calcium chloride with the following component ratio, wt %: calcium chloride 17.0-19.0, ethyl alcohol 25.0-45.0, water 36.0-58.0. At that, pumping of fracturing fluid to the formation is performed in 30-40 minutes after its preparation.

EFFECT: improving well productivity owing to creating large filtration surfaces by hydraulic fracturing of formation with simultaneous prevention of cracks formed during this process in productive formations of weakly cemented loose rocks.

2 cl, 2 ex, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: composition of thermal source for treatment of bottomhole zone of well consists of granulated ammonia saltpetre of grade B, bi-chromate of potassium, epoxy resin of grade ED-20, plasticiser EDOS, and hardener Agidol of grade AF-2M. As components increasing strength of material of composition and temperature of its combustion compression this composition contains mixture of powders of aluminium of dispersity not over 50 mcm and nitro-acid barium of dispersity not over 0.5 mm at the following ratio of composition components, wt %: said saltpetre 52.5-53.0, potassium bio-chromate 2.4-2.5, epoxy resin of grade ED-20 14.3-14.4, plasticiser of grade EDOS 1.3-1.4, hardener Agidol of grade AF-2M 2.1-2.2, aluminium 10.9-10.5, and nitro-acid barium 16.5-16.0.

EFFECT: raised temperature of combustion of thermal source composition facilitating more deep heating and melting deposits of bottomhole zone of a reservoir, which plug channels and pores, while maintaining level of strength for compression of composition material.

FIELD: gas and oil production.

SUBSTANCE: composition of thermal source for treatment of bottomhole zone of well consists of granulated ammonia saltpetre of grade B, bi-chromate of potassium, epoxy resin of grade ED-20, plasticiser EDOS, and hardener Agidol of grade AF-2M. As components increasing strength of material of composition and temperature of its combustion compression this composition contains mixture of powders of aluminium of dispersity not over 50 mcm and nitro-acid barium of dispersity not over 0.5 mm at the following ratio of composition components, wt %: said saltpetre 52.5-53.0, potassium bio-chromate 2.4-2.5, epoxy resin of grade ED-20 14.3-14.4, plasticiser of grade EDOS 1.3-1.4, hardener Agidol of grade AF-2M 2.1-2.2, aluminium 10.9-10.5, and nitro-acid barium 16.5-16.0.

EFFECT: raised temperature of combustion of thermal source composition facilitating more deep heating and melting deposits of bottomhole zone of a reservoir, which plug channels and pores, while maintaining level of strength for compression of composition material.

FIELD: gas and oil production.

SUBSTANCE: unstable interval of reservoir in hole is opened by means of drilling equipment with inhibited polymer drilling mud on water base. Further, there is pumped water-repellent composition with the following component contents, wt %: hydrocarbon product 10.0-60.0; tall oil or a product of its processing 1.0-3.0, amine-containing emulsifier of reverse emulsions 1.0-3.0, the said inhibited polymer drilling mud - the rest. A bath out of composition is set in an interval of the unstable reservoir for a period of not less, than 0.5 hour. Further, during drilling water-repellent composition having been used in form of the bath is transited into drilling agent by circulation.

EFFECT: raised degree of strengthening unstable rock due to its maximal hydrophobisation and mudding by forming water repellent barrier in kind of layer of reverse emulsion in near-borehole zone of well upon reservoir opening; water-repellent barrier further prevents rock contact with disperse water medium of drill agent thus facilitating complex of structure-mechanical properties of said layer at following drilling.

6 cl, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: according to first version drilling agent contains, wt %: bentonite PBMA 6.0-7.0, soda ash 0.1-2.0, caustic soda 0.1-0.5, Givpan 0.2-0.3, Lubriol 1.0, water - the rest. According to the second version drilling agent contains, wt %: bentonite PBMA 5.0, soda ash 0.1-0.5, caustic soda 0.1-0.5, Givpan 0.2-0.3, Kamcel PAC-VV 0.1-0.3, Kamcel PAC-SV 0.1-0.3, Lubriol 1.0, ALS 0.2-0.3, PES 0.1-0.2, water - the rest. According to the third version drilling agent contains, wt %: bentonite PBMA 2.0, soda ash 0.1-0.5, caustic soda 0.1-0.5, Kamcel PAC-VV 0.1-0.2, Kamcel PAC-SV 0.2, Lubriol 1.0, ALS 0.2-0.3, PES 0.1, water - the rest.

EFFECT: accident-free hole drilling under complicated mining-geological conditions, control over pH and removal of ions Ca2+ incoming into solution from carbonate rock.

3 cl, 8 tbl

FIELD: technological processes.

SUBSTANCE: invention relates to a method for inhibition of scale, for instance, barium-containing deposits, in a water system. The method includes pumping an aqueous solution of a scale inhibitor into wells of oceanic field, and the scale inhibitor is an amino acid modified with alkyl phosphonic acid in concentration from 0.1 to 100000 parts per million. A fragment of an amino acid may represent α-amino-acid or amino-acid that contains two or more atoms of carbon between a carboxyl group and an amino group.

EFFECT: method makes it possible to perform continuous oil production with efficient monitoring of scale formation using lower concentrations of an inhibitor.

9 cl, 47 ex

FIELD: gas and oil production.

SUBSTANCE: for decrease of liquid flow from well into reservoir or from reservoir into well procedure for treatment of well passing through underground reservoir consists in introduction of suspension containing thickened viscous-elastic surface-active liquid, agent controlling pH and degradable first solid substance. Further, the procedure consists in facilitating said suspension to prevent said flow of liquid for specified period of time and in facilitating first solid substance to decompose and said viscous-elastic surface active fluid to destroy by means of product of decomposition of said first solid substance. The said degradable first solid substance is decomposed at temperature of the reservoir for time of approximately 4 hours and 100 days. The said agent controlling pH retards rate of decomposition of the said degradable first solid substance. The invention is developed in dependent points of formula.

EFFECT: raised efficiency of well control for desired period of time.

15 cl, 3 ex, 5 dwg

FIELD: gas and oil production.

SUBSTANCE: procedure for preparing propping agent with coating consists in application of coating on surface of granule. Coating consists of binding and fibre, part of which projects beyond borders of a binding layer. Ratio between length of each fibre and diametre of granule is from 0.06 to 0.44. Additionally, there is carried out treatment with silicon-organic or fluoric-carbon oil-wetting agent at amount from 0.5 to 10% of fibre weight. Propping agent is prepared by the above described procedure. The invention is developed in dependent points of formula.

EFFECT: reduced water-cut of hydrocarbon raw stock at operation of well.

9 cl, 8 ex, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: composition for restoration of pressure tightness of threaded connections of casings, insulation of thief zones and stabilisation of unstable permeable rock contains wt %: liquid glass of density ≥1420 kg/cm3 44.99-81.60, alkali drainage of caprolactam production of density ≥1110 kg/cm3 18-55, non-ionogenic surface active substance OP-10 0.01-0.40.

EFFECT: raised operational characteristics of composition at simplification of its production and reduced cost.

4 tbl, 2 dwg

FIELD: gas and oil production.

SUBSTANCE: composition for restoration of pressure tightness of threaded connections of casings, insulation of thief zones and stabilisation of unstable permeable rock contains wt %: liquid glass of density ≥1420 kg/cm3 44.99-81.60, alkali drainage of caprolactam production of density ≥1110 kg/cm3 18-55, non-ionogenic surface active substance OP-10 0.01-0.40.

EFFECT: raised operational characteristics of composition at simplification of its production and reduced cost.

4 tbl, 2 dwg

FIELD: mining.

SUBSTANCE: well drilling method involves addition of effective amount of foam-forming composition to hydrocarbon base liquid in order to create foam hydrocarbon drilling fluid - FHDF, where foam-forming composition includes foam-forming agent and stabilising quantity of polymer, which is enough for formation of foam that is stable at temperature of at least 350°F; pumping of FHDF to drilling string during drilling; pumping of organophilic gas to the well or near distal end of drilling string or in/or near drilling bit at the speed which is enough for obtaining the drilling fluid having the required reduced weight of fluid column, and foam removal from the well. Well drilling method involves circulation of hydrocarbon drilling fluid system including hydrocarbon fluid and effective amount of foam-forming composition added to oil or gas well, where foam-forming composition consists of foam-forming agent and stabilising polymer which is sufficient for formation of foam stable at temperature of 350°F; addition of organophilic gas to the liquid at the speed which is enough for formation of the foam drilling fluid having the required reduced weight of fluid column, in which there increased is entrainment flow rate of fluid, increased amount of drilling slurry and other drilling by-products from the well and removal of foamed drilling fluid from the well.

EFFECT: increasing viscosity of base oil at low shift speeds and reduced speed of gravitational drainage through plateau border between foam cells.

26 cl, 2 ex, 3 tbl, 1 dwg

FIELD: gas and oil production.

SUBSTANCE: composition of thermal source for treatment of bottomhole zone of well consists of granulated ammonia saltpetre of grade B, bi-chromate of potassium, epoxy resin of grade ED-20, plasticiser EDOS, and hardener Agidol of grade AF-2M. As components increasing strength of material of composition and temperature of its combustion compression this composition contains mixture of powders of aluminium of dispersity not over 50 mcm and nitro-acid barium of dispersity not over 0.5 mm at the following ratio of composition components, wt %: said saltpetre 52.5-53.0, potassium bio-chromate 2.4-2.5, epoxy resin of grade ED-20 14.3-14.4, plasticiser of grade EDOS 1.3-1.4, hardener Agidol of grade AF-2M 2.1-2.2, aluminium 10.9-10.5, and nitro-acid barium 16.5-16.0.

EFFECT: raised temperature of combustion of thermal source composition facilitating more deep heating and melting deposits of bottomhole zone of a reservoir, which plug channels and pores, while maintaining level of strength for compression of composition material.

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