Heat source for thermal-gas-hydraulic rupture of bed

FIELD: mining.

SUBSTANCE: heat source comprises a body, which is equipped with a composite material that generates gas during combustion and actuates from an electric spiral, and layers of epoxide compound and thiocol-based sealant sealing the ends of the material of the gas-generating composition. The composite material of the heat source that generates gas during combustion contains efficient amount 20 wt % of powdery polyvinyl chloride chlorinated resin of brand PSH-LS at the following ratio of composition components, wt %: granulated ammonium nitrate of grade B - 57.0±0.2; potassium bichromate - 3.0±0.1; aluminium powder of grade ASD-4 - 5.0±0.1; barium nitrate - 15.0±0.2; polyvinyl chloride resin of grade PSH-LS - 20.0±0.2. The gap produced in the outfit between sticks and the body of the heat source is filled with a filling solution capable of hardening. Between the igniter and the composite material the heat source comprises layers of additional igniting composition with the capability of its ignition from the igniter and ignition of the gas-generating composition at the end and along the surface of the heat source channel.

EFFECT: increased safety of operation, transportation and storage of a device for hydraulic rupture of a bed.

2 dwg

 

The invention relates to the oil industry, in particular, to devices for increasing the productivity of oil wells by the bottomhole zone treatment due to hydraulic fracturing gaseous products of combustion of the vices and solid fuels.

One of the efficient and effective methods of bottomhole zone treatment with the aim of establishing a reliable hydrodynamic connection of the well layer is a method of fracturing gaseous products of combustion of the powder charge and thermal effects on the bottomhole formation zone. As is known [1], for these purposes using the powder pressure generator type PGDBM or pressure accumulators type DT. Pressure generator PGDBG consists of several interconnected powder charges with axial channels that are mounted on a support tube; entire surface covered with a waterproofing composition, and on the outer side surface of the additional coating, which prevents the charge from friction and shock of the column and providing progressive combustion from the surface of the channel.

Powder pressure accumulators TD-5 and TD-6 differ in the design of the propellant charge. The accumulator pressure DT-6 consists of igniting and burning powder charges with axial channels, and burning powder charge BPA-5 - ductless. FOTS is nanaumi powder charge differs by the fact, that it has a sealed spiral filament to ignite the powder charge when applying an electric voltage. Powder charges BPA-5, BPA-6 does not have a sealed shell and are in contact with the borehole fluid.

Currently known generators and pressure accumulators for hydraulic fracturing consists predominantly of charges ballistic powder or mixed solid fuel and differ mainly by improvements aimed at regulating the magnitude and duration of the pulse pressure of the powder gases, affecting the processing interval of the productive formation. So, for example, the known gas generator [2], consisting of an Assembly of a group of charges with axial channels, the means of ignition, load-bearing cable for delivery of the gas generator in the hole and mount the generator to the cable. The first group of charges is made of composite solid fuel, providing the combustion of creating a pressure impulse in excess of rock pressure, and the second group of charges is made from ballistic or mixed solid fuel, creating a secondary front pressure value is not less than 0.7 magnitude of the first pressure pulse in a period of time exceeding the duration of the first pulse 3-15 times. The means of ignition of the charges carry the network in the form of segments of detonating and igniter cords, located in the axial channel Assembly charges and interconnected using a docking station, with detonating cord is installed with the possibility of ignition of the charges of the first group, and igniter cord - charge of the second group. The disadvantage of the gas generator is unreliable ignition of propellant charges from the detonating cord, as well as from the detonating cord to the igniter cord.

A common disadvantage of the above charges from ballistic or solid composite propellant used as generators and pressure accumulators for hydraulic fracturing, is their detonation ability and associated low security, which can lead to emergency situations due to violations of the detonation of well integrity. Such charges, in addition, require special conditions of storage, transportation and operation.

Known so-called termostatico used alone or in devices for thermoerosional processing wellbore zones. thermopile is made on the basis of the gas-generating combustion of solid composite material of a mixture of ammonium nitrate and epoxy polymer fuel. Devices that use such termostatico described in [3, 4, 5, 6] and consists of a sealed air chamber with atmospheric giving is the group of diaphragm and an inlet chamber holds combustible solid composite material, which in the literature is called a thermopile [3].

Known thermopile [6] includes made of lightweight elastic-plastic material housing, which in the main (second) part filled out by the combustion of gas-generating compositions with strength in excess of downhole pressure and comprising, by wt.%:

Ammonium nitrate Prill grade B70-74
The bichromate of potash3-5
Epoxy resin grade ED-2019,5-21,5
The plasticizer grade ADOS1,5-2,0
Hardener Agidol brand AF-2M3.5 to 4.5

The advantage of this composition termostatico is that it is meditenanean (hazard class 4.1.1), increasing its safe operation, as well as the possibility of formation of a core by the combustion of gas-generating material termostatico with high compressive strength, component of 40 MPa. The disadvantage of the composition, compared with balistidae powders used for the idromassage layer, is their low temperature combustion (990°C), while ballistic powder have a combustion temperature of about 2200°C, which allows them, ceteris paribus, to create more high energy and pulse pressure for fracturing.

Closest to the proposed invention is a thermopile for processing bottom-hole zone of the well, formed from the composition [7], including ammonium nitrate granular grade B, bichromate of potash, epoxy resin grade ED-20, plasticizer ADOS, hardener Agidol brand AF-2M, with quality components that increase the strength of the materials of the composition in compression and the temperature of combustion, it further comprises a mixture of aluminum powders dispersion of not more than 50 μm and barium nitrate dispersion of not more than 0.5 mm, the following proportions of the components of the compositions, wt.%: ammonium nitrate Prill grade B 52,5-53,0; bichromate of potassium 2,4-2,5; epoxy resin grade ED-20 14,3-14,4; plasticizer grade ADOS 1,3-1,4; hardener Agidol brand AF-2M 2,1-2,2; aluminum of 10.5-10.9 and barium nitrate of 16.0 to 16.5. The advantage of termostatico for processing bottom-hole zone of the well is that it is filled with the composition having a combustion temperature equal 2360°C, which is at the level of this indicator for ballistic powders, effectively used in the generator and the pressure accumulators for hydraulic fracturing, another advantage is negotiationsthe used in the compositions, as well as higher compressive strength of the material composition (46 MPa).

The lack of termostatico the prototype is that of his compositions can be made gas-generating material only end burning in a sealed enclosure because of the hygroscopic compositions based on ammonium nitrate. At this time of combustion of the material of the end burning in downhole conditions is a few minutes. To create a high and short pulse for fracturing is necessary to form the material composition in the form of compressed checkers with a Central channel, as in generators and pressure accumulators based ballistic powder, which can increase surface ignition and combustion, which significantly reduces the burning time of the gas-generating material, as in the presence of channel this time is determined by the thickness of the burning vault. To form the gas-generating material termostatico pressing in the form of checkers with channels practically, however, is not possible due to the high adhesion of the material to the metal press tool associated with the presence in the composition of the high adhesion of the binder is epoxy compound (a mixture of epoxy resin ED-20 with plasticizer and Tvardita is eating). For this reason, the composition of termostatico the method prototype equip directly into the body of termostatico consistent seal each portion of the manual gasket with padded tool - stock items.

In the present invention solves the problem of improving termostatico and by the combustion of gas-generating material composition to allow the formation of its pressing in a separate checkers with a Central channel, the subsequent equipment in the building and functioning of termostatico in pre-sealed.

The task is solved in that thermopile, including made of lightweight elastic-plastic material housing, which is filled by the combustion of gas-generating a composite material consisting of a mixture of ammonium nitrate granular grade B, bichromate of potash, aluminum powder brand ASD-4 and barium nitrate; an igniter fired from electric spiral, and sealing the ends of the gas-generating material composition of the layers of the epoxy compound and sealant based Thiokol, according to the invention by the combustion of gas-generating composition material termostatico contains an effective amount of 20 wt.%. powdered chlorinated polyvinylchloride resin grade PSC-HP at the next appropriate is Oseni components of the composition, % wt.:

Ammonium nitrate Prill grade B57,0±0,2
The bichromate of potash3,0±0,1
Aluminum powder brand ASD-45,0±0,1
Nitrate barium15,0±0,2
A polyvinylchloride resin grade PSC-HP20,0±0,2

the possibility of forming a composite material by extrusion in the form of a group of checkers with a Central channel. Formed by the gear gap between checkers and body termostatico filled with capable of curing the casting solution, and the Central channel with both ends pre-closed solid cylindrical spacers. When thermopile between the igniter and the composite material layer contains an additional igniter composition with the possibility of ignition from the igniter and ignition of the composite material from the end face and the surface of the channel checkers.

We offer thermopile shown in the figure and includes a light elastic-plastic polyvinyl chloride (PVC) casing 1, which is loaded when the gas-generating CDF is assured a composite material in the form of group pressed checkers with a Central channel 2. Formed by the gear gap between checkers and body termostatico filled with capable of curing the casting solution 3. The Central channel of the group of checkers on both ends pre-closed solid cylindrical spacers 4. Between the igniter with an electric coil 5 and the composite material 2 thermopile layer contains additional igniter composition 6 capable ignited by the igniter 5 and to ignite the gas-generating composition from the end and on the surface of the channel checkers. Case termostatico with both ends sealed with layers of epoxy compound 7 and sealant based Thiokol 8. To the housing termostatico in the upper part of the connected pipe with Windows 9, ending with the cable head 10 for connection to a cable-rope.

thermopile works as follows. Using connected to the cable head 10 cable rope thermopile down to the bottom hole and set in front of the processed interval of the formation. From the wellhead through the cable serves an electrical impulse to the igniter 5, which ignite the additional igniter composition 6. From the latter happens ignition of the gas-generating composition in the beginning from the end, due to which there is an opening of the Central channel. Gazoo the different combustion products move into the channel, igniting the surface of the channel, and creating pressure. Due to this wikibedia upper gasket, pre-closing the channel. Since then, the combustion products are derived not only from the bottom of the channel, but from above, passing through the Windows of the pipe 9 into the wellbore. The combustion group of checkers 2 composition when this is done radially, consistently covering the entire thickness of the burning vault. Because of the relatively small thickness of the burning roof and correspondingly small combustion time, this thickness is in the range of processing creates a high pressure pulse of heated gaseous products of combustion in excess of formation pressure, which leads to the formation of termolaterizio layer with an extensive network of cracks around the perforations.

The possibility of forming a composite material termostatico pressing in a group of checkers with a Central channel in the present invention is implemented by replacing the liquid is capable of curing the epoxy compound comprising epoxy resin ED-20, plasticizer ADOS and hardener Agidol and makes the whole composition is not capable of pressing because of its high adhesion to the metal presentment, solid powdered chlorinated polyvinylchloride resin grade PSC-LS.

Studies have shown that the use of Poroskov the different resin PSC-drugs effective in the amount of 20% wt. allows the pressing quality checkers with a Central channel and smooth surfaces with a relatively low specific pressure of 100 MPa, and provides a high relative density of 0.95, and the actual density checkers is 1.63 g/cm3. The compressive strength of the proposed composite material is equal to 47 MPa, which is at the level of the material composition of the prototype. The burning rate of the material composition, determined in laboratory conditions simulating downhole conditions of a liquid medium and the pressure is 12-14 mm/s in the field of pressure of 50-60 MPa, which provides for the thickness of the burning of the code, equal to 25 mm, the time of its burning about 2 seconds required to create a high pulse pressure during hydraulic fracturing. Introduction to the composition of termostatico powdered chlorinated polyvinylchloride resin also has the advantage that it facilitates the operation of mixing the components of the composition and, no less important, is the acid component content of 64% may. chlorine can form in the reaction of combustion of the composition of high-temperature and chemically highly active hydrochloric acid and to increase the processing efficiency of the well.

Due to the fact that the diameter of the pieces of the composite material is less than the inner diameter of the housing dermoestetica, formed at the gear gap should be filled with low-viscosity pre-capable for subsequent curing to transition into a solid layer, filling solution, to resolve when exposed to borehole pressure, the possibility of cracking and violations sealed enclosure termostatico.

As such priming solution after pre-testing were used liquid epoxy compound in the ratio 76/16/8 its components epoxy resin ED-20, hardener Agidol and plasticizer ADOS, the viscosity is able to freely poured into the gap size of about 2 mm, and after one day be cured with the magnitude of the compressive strength equal to 107 MPa. This value significantly exceeds the value of strength checkers composite material, equal to 47 MPa, which helps to increase the strength of termostatico.

Composite material in the case of termostatico must be formed in a sealed design, so the front-end part of it covered with layers of capable of curing a layer of the epoxy compound and sealant based Thiokol. In the area of the Central channel these sealing layers are not able, however, to withstand the downhole pressure, which can lead to ingress of wellbore fluid into the channel and premature failure of termostatico. For sight is brasenia that the ends of the Central channel closed solid metal shims of the required thickness, then the surface of the upper checkers is filled with a layer of epoxy compound with a thickness of 2 mm, and after curing it is covered with a layer tikologo sealant same thickness.

As the igniter termostatico usually applied composition, comprising, in % by weight: ammonium nitrate - 70, bichromate of potash - 10, an epoxy resin (brand ED-20) - 13,2, plasticizer grade ADOS - 1.6 and hardener (type AF-2) - 5,2 and triggered from electric spiral filament. However, as shown by preliminary trials because of the difficult Flammability him a composite material checkers and cases of failure, in the present invention between the igniter and the composite material includes a layer of additional igniter composition, which can be ignited by the igniter and reliably ignite the gas-generating composition from the end and on the surface of the channel checkers. As such additional igniter composition used mixture comprising,% wt.: ammonium nitrate - 72, bichromate of potassium - 3, epoxy resin (brand ED-20) - 19, plasticizer grade ADOS - 1.5 and hardener (type AF-2) - 4,5.

The performance of the proposed termostatico for termokataliticheskikh fracturing confirmed by the results of bench tests on the plant, simulating downhole conditions. Installation(see e.g. [8]) is an elongated vessel-hole high-pressure inner diameter of 122 mm, filled to a certain level with water and sealed with a lid. Height adjustment of the air space above the water level to achieve the magnitude of the operating pressure in the vessel is smaller than the threshold. In the body of the vessel is a pressure transducer for continuous recording of pressure changes in the vessel in time.

For bench tests used in-situ sample dermoestetica, design corresponding to the drawing figure 1, the diameter PVC casing 75 mm filled composite material made of two pieces with a diameter of 64 mm with a Central channel with a diameter of 15 mm total weight 580 g and additional igniter composition weight of 150 g and a height of 25 mm Strip of steel that covers the Central channel had a diameter of 18 mm and a thickness of 1.2 mm

The results of bench tests of the sample termostatico in the form of the dependence of the pressure change from the time of its burning is on the figure 2, which shows that after the combustion layer melanogenesis additional igniter composition, the burning rate which at pressures of 1-10 MPa is 1.0-1.5 mm/s, the main composite material termostatico creates within 2 seconds high pressure pulse with a maximum in the guise of 56.7 MPa, sufficient for hydraulic fracturing. These data confirm the efficiency of the proposed termostatico in downhole conditions, the main advantage of which is redecoration capacity and high safety during operation, transportation and storage, compared to currently used for the purposes of hydraulic fracturing generators and pressure accumulators on the basis of charges from ballistic powder.

List of used sources

1. Perforating-explosive equipment. The Handbook. Edited by L.Y. Fridlander, 2nd ed., Rev. and supplementary Moscow, "Nedra", 1990, p.10-116.

2. RF patent №2242600, CL EV 43/263, publ. 20.12.2004,

3. IVAN Sadykov and other Main results of the development and introduction of new rapid technologies thermoerosional and perforation-implosion processing marginal wells. NTV "Carotenic", Tver; ed. AIS, 2001, VIP, P.57-60.

4. RF patent №2075597, CL EV 43/25, publ. 20.03.97, bull. No. 8.

5. RF patent №2138630, CL EV 43/25, publ. 27.09.99, bull. No. 27.

6. RF patent №2313663, CL EV 43/18, SC/70, publ. 27.12.07, bull. No. 36.

7. RF patent №2436827, CL C09K 8/528, 8/594, publ. 20.12.2011, bull. No. 35.

8. RF patent №2114984, are recorded. 10.07.1998.

thermopile for termokataliticheskikh fracturing, including made of lightweight elastic-plastic material housing, which is equipped gas-generating when SG is Rania composite material, consisting of a mixture of ammonium nitrate granular grade B, bichromate of potash, aluminum powder brand ASD-4 and barium nitrate; an igniter fired from electric spiral, and sealing the ends of the gas-generating material composition of the layers of the epoxy compound and sealant based Thiokol, characterized in that the gas-generating combustion of composite material termostatico contains an effective amount of 20 wt.% powdered chlorinated polyvinylchloride resin grade PSC-LS in the following ratio of the components of the composition, wt.%:

Ammonium nitrate Prill grade B57,0±0,2
The bichromate of potash3,0±0,1
Aluminum powder brand ASD-45,0±0,1
Nitrate barium15,0±0,2
A polyvinylchloride resin grade PSC-HP20,0±0,2

the possibility of forming a composite material by extrusion in the form of a group of checkers with a Central channel; formed with the gear gap between checkers and body termostatico filled with able to the proof casting solution, the Central channel with both ends pre-closed solid cylindrical spacers, and thermopile between the igniter and the composite material layer contains an additional igniter composition with the possibility of ignition from the igniter to ignite the gas-generating composition from the end and on the surface of the channel checkers.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method involves assembly of a pressure generator in the form of a group of cylindrical solid fuel charges with central through channels, lowering of the pressure generator to the well, installation of the pressure generator at the specified depth of the well, supply of a signal for ignition of charges and fracturing of the formation. In the existing casing string of the well, preliminary perforation density is performed as 30-45 holes per running metre, assembly of a pressure generator is performed out of three groups of solid fuel charges with location of charges of the first group below charges of the second and the third groups; the pressure generator is installed in the well above the perforation interval so that ratio of distance between upper perforation boundary and lower charge of the first group to length of perforation interval comprises the value of 0.3-0.6. The first group of charges has a charge with an igniter and total design weight of all charges, which provides the possibility of ignition of above located charges of the second group with the developed combustion surface and gas emission at combustion, which provides opening of existing vertical fractures in the formation and initiation of combustion of charges of the third group, which provide non-reversible deformation of mine rocks of the formation with creation of a residual vertical fracture.

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2 cl, 2 dwg

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2 cl, 4 dwg

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FIELD: oil and gas industry.

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6 cl, 6 dwg

FIELD: oil and gas industry.

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3 cl, 1 tbl, 1 dwg

FIELD: oil and gas production.

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2 cl

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FIELD: oil and gas industry.

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EFFECT: increasing operating efficiency of the device.

8 cl, 1 dwg

FIELD: oil and gas industry.

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EFFECT: increasing intensification effect of the product inflow from the formation owing to reducing the charge energy losses, increasing the operating safety and improving the effect of stable formation drainage in time.

1 ex

FIELD: chemistry.

SUBSTANCE: aqueous composition which contains a mixture of water, 0.05-10 wt % of at least one water-soluble polymer for obtaining a viscoelastic gel when dissolved in water, where concentration of the polymer exceeds critical gel-formation concentration, where the water-soluble polymer has number-average molecular weight from 5 kg/mol to 20000 kg/mol and contains one or more polymers from a given group, a surfactant which contains 0.08-3 wt % crude mass from a zwitterionic surfactant selected from: alkyl betaines and alkylamidopropyl betaine, sulphobetaines and alkyl sultaines, alkyl ethers of hydroxypropyl sultaines and alkylamidopropyl hydroxysultaines, where the alkyl contains 18-22 carbon atoms, and optionally less than 0.3 wt % of each of an anionic, amphoteric and nonionic surfactant and 0.1-20 wt % of a crude mass of an inorganic salt selected from: univalent ions, divalent ions and trivalent chloride, bromide, sulphate, carbonate and nitrate ions and optionally a propping agent. A method of extracting a hydrocarbon from an underground formation involves feeding an aqueous fluid containing said composition into the formation. The aqueous composition consists of a mixture of: water, 0.05-10 wt % water-soluble polymer for producing a viscoelastic gel when dissolved in water, where concentration of the polymer exceeds critical gel-formation concentration, the water-soluble polymer has number-average molecular weight of 5-2000 kg/mol and contains one or more polymers from a given group, 0.08-3 wt % of a crude mass of a zwitterionic surfactant selected from: alkyl betaines and alkylamidopropyl betaine, sulphobetaines and alkyl sultaines, alkyl ethers of hydroxypropyl sultaines and alkylamidopropyl hydroxysultaines, where the alkyl contains 18-22 carbon atoms, less than 0.3 wt % of each of an anionic, amphoteric and nonionic surfactant, at least one component selected from: a propping agent, cosolvents, acids, bases, buffers, chelating agents for controlling multivalent cations, freezing point depressants, clay or sand stabilising materials, biopolysaccharides, cellulose ethers, acrylamide polymers, corrosion inhibitors, oxygen acceptors, bactericides, where the clay or sand stabilising materials are selected from: epoxy resins, poly(N-acrylamidomethyl-trimethylammonium chloride) and poly(vinylbenzyltrimethylammonium chloride); cosolvents are selected from: propylene glycol or glycerin, or an aliphatic alcohol having 4-24 carbon atoms; 0.1-20 wt % of a crude mass of an inorganic salt selected from: univalent ions, divalent ions and trivalent ions. The invention is developed in subclaims.

EFFECT: high resistance to salts and surfactants.

28 cl, 1 tbl, 6 ex, 8 dwg

FIELD: oil and gas industry.

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EFFECT: increased inhibiting and stabilising properties.

2 ex, 2 tbl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: drilling mud contains, wt %: clay powder 5-8; polyelectrolyte VPK-402 7-15; water - balance.

EFFECT: increased inhibiting ability in respect to clays, reduced filtration parameter, higher salt and heat resistance.

2 cl, 3 tbl

Drilling mud // 2492207

FIELD: oil and gas industry.

SUBSTANCE: drilling mud contains, wt %: clay powder 3.3-5.3; VPK-402 1.4-2.4; liquid paraffin C10-C16 5.3-8.8; defoaming agent MAS-200 - 0.06-0.2; water - balance.

EFFECT: increased inhibiting ability in respect to clays, reduced filtration parameter, higher salt and heat resistance.

2 cl, 3 tbl

FIELD: oil and gas industry.

SUBSTANCE: in one aspect a proppant is proposed, which comprises a substrate and a coating. At the same time at least either a substrate or a coating or both contain one or more materials that perceive radiation. In another aspect a method is proposed, which includes placement of a proppant and/or a liquid for treatment in the bed crack, and those contain materials that perceive radiation, radiation of the material that perceives radiation with neutrons, measurement of gamma radiation released by the material that perceives radiation per single lowering-lifting of a logging probe, and determination of height of the bed crack by the measured gamma radiation. At the same time the only lowering-lifting of the probe may be a continuous or a periodical process.

EFFECT: group of inventions makes it possible to track and control a process of underground bed hydraulic rupture.

26 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method to produce an isolating gel-forming water-based solution containing an aqueous solution of liquid glass with a silicious module includes titrating with hydrochloric acid. The solution is reinforced with alkaline-soluble vegetable galactoglucomannan. Using hydrochloric acid, the produced solution is titrated, the value pH of which is set within 8.5-11.4, necessary for transition of galactoglucomannan into undissolved state. Components of the isolating gel-forming solution are used at the following composition, wt %: galactoglucomannan 0.1-0.5, liquid glass 5-8, balance - water.

EFFECT: higher efficiency and reliability of the method.

2 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to oil-producing industry, in particular to compositions for isolation of water influx in production and injection wells. Composition for isolation of water in well includes copolymer of sodium metacrylate and methacrylic acid and structurant. As copolymer of sodium metacrylate and methacrylic acid reagent "Vitam" is used, with alumochloride solution being used as structurant, with the following ratio, vol.%: reagent "Vitam" 25-75, alumochloride solution 25-75. Additionally in composition used is water-cement mixture with water-cement ratio 0.5-0.8 in volume equal from 12 to 22% of the total volume of reagent "Vitam" and alumochloride solution.

EFFECT: increased efficiency of water influx limiting and reduction of content of water in oil.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to oil and gas industry, in particular to methods of selective isolation of water influxes in gas and oil wells, sealing of hole clearance, elimination of inter-strata inter-flows in wells with closely located gas-oil-water contact, including conditions of low-permeability reservoirs. Grouting mortar of selective action contains, wt %: fine-ground cement Microdur 33.83-36.96, hydrocarbon carrier - Diesel fuel 57.51- 62.84, de-emulsifier-separol 0.20-2.35, hardening activator aluminium sulphate or iron sulphate, or potassium carbonate 0-8.22.

EFFECT: extension of application field and increase of reliability and efficiency of grouting due to improvement of technological possibilities of grouting mortar and increased filtering capability into low-permeability reservoirs, micro-clearances and microcracks.

2 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: present invention discloses coated particles for extracting oil, a proppant which contains the coated particles and a method for oil field development using said particles. The coated particles contain aggregate particles and an oil-permeable and water-impermeable film which coats the aggregate particles; the film is formed by at least two oleophilic and hydrophobic resins, an oil-permeable and water-impermeable epoxy resin, an oleophilic and hydrophobic phenol-aldehyde polymer, an oleophilic and hydrophobic polyurethane, with the weight ratio of the two types of oleophilic and hydrophobic resins of 1:0.1-10. The method for oil field development employs said particles. The invention is developed in subclaims.

EFFECT: high efficiency in reducing volume of produced water and high oil extraction.

10 cl, 15 ex, 2 dwg, 2 tbl

Proppant // 2490299

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to oil and gas producing industry; it can be used during hydraulic fracturing of productive stratum in order to increase efficiency of hydrocarbons extraction. The proppant includes ceramic granules having open exposed porosity up to 2% and open exposed porosity within range of 2 - 20%, at that ration of the above granules with different exposed porosity in a slug during well operation is the following: wt % of granules with porosity up to 2% is 3-97, wt % of granules with porosity from 2 up to 20% is 3-97. The invention is substantiated in dependent claims.

EFFECT: improvement of proppant slug productivity and conservation during a long period notwithstanding a value of formation pressure.

4 cl, 4 ex, 4 tbl

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

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