Plastic composition for formation water inflow insulation in well and stabilizing of producing formation and method of its application

FIELD: oil and gas industry.

SUBSTANCE: method of formation water inflow insulation in the well and stabilising of the producing formation is to inject the silicon containing composition with the aqueous solution of the inorganic cross-linker and the plasticiser, while the organosilicone oil soluble or water soluble substance or silicone based substance is used as the silicone containing substance with the following component ratio, wt %: 55-89 of the organosilicone oil soluble or water soluble substance or silicone nonorganic substance, 10-40 of nonorganic crosslinker water solution, plasticiser 1-5.

EFFECT: improvement of the formation water inflow insulation in the well and stabilising of producing formation with the adjustable mechanism for curing of the injected composition at low and high temperatures.

4 cl, 5 tbl, 5 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: method for interval acidising of a horizontal well using a carbonate reservoir, which includes lowering a pipe string into a well; pumping acid compositions into the formation through the pipe string; conducting geophysical investigations in the horizontal well before treatment; selecting and separating intervals of the horizontal well into two groups; the first group includes intervals with permeability of 40-70 mD and water cut of the extracted product of 70-80%; the second group includes intervals with permeability of 5-39 mD and water cut of the extracted product of 50-69%; lowering into the horizontal well a pipe string plugged at the bottom and fitted with two packers with a perforated connecting pipe in between; performing consecutive treatment of the intervals of the horizontal well relating to the first group by sealed cut-off of each interval with subsequent alternating pumping into each interval in three cycles a temporary blocking composition at a rate of 6-12 m3/h, the temporary blocking composition used being a water-in-oil emulsion with dynamic viscosity of 120 mPas at 20C, and an acid composition at a rate of 54-66 m3/h; after treatment of the intervals of the horizontal well relating to the first group, retrieving the pipe string from the horizontal well; at the mouth of the horizontal well, the pipe string is fitted with a liquid pulsator above the perforated connecting pipe and the pipe string which is plugged at the bottom and fitted with two packers with a perforated connecting pipe in between is once more lowered into the horizontal well; treating the intervals of the horizontal well of the second group by sealed cut-off of each interval with subsequent pulsed pumping into each interval a self-deviating acid composition based on a gelling agent at a rate of 24-36 m3/h.

EFFECT: intensifying oil extraction from a horizontal well, increasing oil yield and reducing the water cut of the extracted product.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: gas-cement grouting mortar contains, wt. pt.: grouting cement 100, aluminium powder 0.1-0.6, mix of a phosphanol and nitrilothrymetil phosphonic acid 0.02-0.05 at their ratio wt. pt. 1:1.5, water 50-53.

EFFECT: improvement of quality of cementation of wells and efficiency of works on cementing of loose weakly cemented rocks of bottomhole zone of formation during repair of wells due to use of gas-cement grouting mortar with improved process properties due to the lowered dynamic shear stress, increase of time of the beginning of gas emission and increased strength of cement stone formed at curing.

1 tbl, 4 ex

FIELD: oil and gas industry.

SUBSTANCE: invention relates to methods of current underground well workover. Method includes injection of silicon dioxide suspension that in itself does not have cementing properties, to cavities in the damaged cement enclosure or near it. At that silicon dioxide particles react with solidificated cement creating seals.

EFFECT: improved method.

8 cl, 12 dwg, 4 tbl

FIELD: mining.

SUBSTANCE: into the lower part of the impervious man-made screen containing dolerite rocks, the cement grouting is pumped, based on sulphate resistant or calcium aluminate cement with hardener (2% CaCl2) under pressure greater than hydrostatic, through the wells drilled from underground excavations. In the cement grouting the filler is used as mill tailings with a fraction of 0.1-0.25 mm, corresponding to fine sand. It is kept till hardening. After hardening the resulting rock-cement layer of the impervious screen is tamped with local injections of synthetic resins under pressure, less than the pressure of fracture of rock mass of mining protective pillar left under the screen. And the cement grouting is pumped under pressure of 0.7-0.8 MPa, and local injections of synthetic resin is carried out at a pressure of 0.5-0.6 MPa. The synthetic resin is used as hydro-active compositions based on LT-70 with the addition of a solvent - dimethylformamide in an amount of 20-25%.

EFFECT: increased strength and increased of impervious properties of the screen when filling the open pit.

6 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of isolation of the water influxes to well comprises water isolation composition injection in the isolation zone, composition contains modified soluble glass, 3.6-10 or 1-3.5 parts by volume of ethyl acetate, and surface-active substance. At that in the water isolating composition 100 parts by volume of high-modulus soluble silicate with silica module 3.5-6 and density 1025-1200 kg/m3 is used as modified soluble silicate at temperatures exceeding 10C. 0.2 parts by volume of detergent preparation with weight ratio of surface-active substances 30-38% and freezing temperature minus 30C minimum are used as surface-active substance.

EFFECT: increased efficiency of water influx isolation and expansion of temperature range for the methods use.

2 cl, 2 ex, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: in method for elimination of behind-casing flows and inter-casing pressures, which involves preparation of aerated grouting mortars of light weight and normal density, their series delivery to a production string and squeezing to behind-casing and inter-casing spaces with squeezing liquid, as aerated grouting mortars of light weight and normal density there used are sedimentation stable fine-aerated solutions with densities of not higher than 1650 kg/m3 and not lower than 1800 kg/m3, which contain no extra Portland cement and heat-resistant plasticising and expanding additive including kaolin clay thermally activated at the temperature of 9001000C with specific surface of 300400 m2/kg, aluminium sulphate, boric acid and an Aeroplast air-entraining additive excluding formation of stable foam, and mixing liquid at the following ratio of components, wt %: non-extra Portland cement 85-75, kaolin clay 10-18, aluminium sulphate 4.7-6.1, boric acid 0.2-0.5, Aeroplast air-entraining additive 0.1-0.4, mixing liquid over 100% till water-mixed ratios of 0.630.65 m3/t and 0.400.50 m3/t are obtained, with that, first, sedimentation stable aerated light-weight grouting mortar is delivered with controlled density of not more than 1650 kg/m3, then, aerated grouting mortar of normal density of not more than 1950 kg/m3 is delivered; with that, required densities of grouting mortars are provided by variation of a water-mixed ratio, intensity and duration of mixing, and squeezing is performed till partial displacement of aerated light-weight grouting mortar from behind-casing (inter-casing) space with squeezing liquid heated up to 5060C during winter season and at cementing of low-temperature wells.

EFFECT: improving cementing quality.

2 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the technology intended for well productivity improvement. Large-volume selective acid treatment (LVSAT) for producers in carbonate reservoirs includes the injection to the well of an acid composite band with the specific volume of 1.5-3m3 per 1 m of an oil-saturated interval and non-linear viscous deflecting fluid before and/or upon the injection of the acid composite band, at that the injection of the acid composite is carried out with an optimal flow rate and an optimal ratio of a deflecting fluid volume to the acid composite volume, which are defined by mathematic modelling of the process considering changes in the wellhead and bottomhole pressure, type of the acid composite, type of the deflecting fluid, porosity and permeability of rock; at that for the purpose of the optimal flow rate optimisation for the acid composite injection dependencies of the optimal flow rate of injection on the specific volume of reagents injection are obtained with different constants of the reaction.

EFFECT: improved efficiency of large-volume selective acid treatment (LVSAT) for carbonate reservoirs.

2 cl, 5 tbl, 1 ex, 11 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to oil and gas extraction industry and can be used in modifying filtration properties of formations, during hydraulic fracturing, fluid flow separation in a well, borehole cleaning and other repair works. The multipurpose gel-forming composition includes 3-4 wt % carboxymethyl cellulose or polyanionic cellulose, 5-14 wt % potassium alum, 0.2-06 wt % sulphanole, 0.2-0.6 wt % propylene glycol, 0.02-0.06 sodium tetraborate and water.

EFFECT: obtaining a non-toxic, low-density gel-forming composition.

6 ex, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: in a preparation method of compositions for the isolation of behind-the-casing flows in a well that includes mixing of microcement and additives, oil well portland cement with the specific surface of 800 or 900 m2/kg is used as the microcement and a water-soluble acrylamide polymer, copolymer of vinyl amide and n-vinyl lactam, olefin sulphonate and polyethylene glycol at the water-cement ratio of 0.75-1.2 are used as the additives for the preparation of the composition; a microcement grouting fluid is prepared preliminarily with a solution of the above listed additives in water at simultaneous stirring, then the microcement is added to the produced fluid with the following ratio of ingredients, in weight parts: oil well portland cement with the specific surface of 800 or 900 m2/kg - 100, water-soluble acrylamide polymer - 0.01-0.02, copolymer of vinyl amide and n-vinyl lactam - 1.0-2.5, olefin sulphonate - 0.01-1.0, polyethylene glycol - 0.05-0.15, and water 75-120.

EFFECT: improved workability and efficiency in the isolation of behind-the-casing flows in the well due to the increased strength and expanded time range for hardening of the microcement-based composition.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: isolation method of water influx to well includes injection of organosilicone product to the isolated interval. At mixing to Devonian oil is added to organosilicone product; product 119-296I of B trademark is used as organosilicone product. The water is added with density of 1000-1190 kg/m3, the composite is mixed and injected to the isolated interval with the following ratio of ingredients, parts by volume: product 119-296I of B 100 trademark, water with density of 1000-1190 kg/m3 50-100, Devonian oil 10-20. The composite is reinforced by injection of liquid glass. At that buffer of fresh water is injected between the composite and liquid glass.

EFFECT: improved efficiency of water influx isolation due to regulation of time for gel formation of the injected composite and prevention of its early gel formation.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: dry mixture for makeup of well-killing fluid containing industrial powdered lignin sulphonate, biopolymer of xanthane gum and bone glue with the following ratio of ingredients, wt %: the above lignin sulphonate 86.7-90.0, biopolymer of xanthane gum 9.5-12.5, bone glue 0.5-0.8.

EFFECT: improving impermeable properties of the well-killing fluid made of dry mixture having high stability during storage due to excluded caking and lumping, ensuring potential regulation of density of the well-killing fluid, reducing time and simplifying technology of well-killing fluid makeup of non-critical reagents, reducing time for well development, potential usage of the well-killing fluid at low climatic temperatures, expanding range of reagents, saving transportation costs.

2 cl, 1 tbl

FIELD: agriculture.

SUBSTANCE: method comprises deep loosening of soil, application of fertilizers and ferrous sulphate solution, and watering with increased irrigation rate. At that as the fertilizer the urea formaldehyde fertilizer is applied in the topsoil, which is saturated with ferrous sulphate solution and encrusted with phosphogypsum. After completion of washing the fertilizer is moved to the lower part of the ploughed horizon.

EFFECT: efficient desalination of irrigated saline soils with improvement of soil structure, increase in soil fertility and erosion resistance without damaging the surrounding area and plants.

FIELD: oil and gas industry.

SUBSTANCE: cement slurry contains 46.0-75.0 wt % of binding material and as such portlandcement of packing class G or cement mix Micro TSS BTRUO or a mix of aluminous cement GTS-40 and microcement Micro TSS BTRUO in mass ratio of 3:7, or a mix of aluminous cement GTS-40 and portlandcement PTST 50 in mass ratio of 1:4 is used; 1.0-4.0 wt % of surfactant and as such a mix of emulsifying agent MR-150 is used with calcium alkyl benzosulphonate and emulsifying agent OP-4 in mass ratio of 1:4:9; or a mix of emulsifying agent MR-150 is used with calcium alkyl benzosulphonate, water-repellent agent ABR and Neftenol VKS-N in mass ratio of 4:4:3:3; 9.0-27.0 wt % of diesel fuel; 0.0-0.5 wt % of calcium chloride; 0.0-2.0 wt % of condensed microsilica MK-85 and fresh water - the remaining share.

EFFECT: improved fluidity, reduced water loss, improved strength and durability of cement stone.

2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to compositions and methods of wellbore processing. A composition for wellbore cleaning contains, wt %: solvent 10-45; cosolvent 10-40; hydrophilisating surface-active substance 5-10; purifying surface-active substance 5-20; non-ionogenic surface-active substance 1-10; non-ionogenic auxiliary surface-active substance 1-5; emulsifying surface-active substance 1-5; water liquid 1-5.

EFFECT: improvement of cement binding in the annulus space between the case pipe and the rock surface.

14 cl, 4 ex, 4 tbl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention relates to compositions for wells treatment for use in oil industry. Composition for well treatment containing chemical for well treatment adsorbed using water-insoluble adsorbent, where composition is produced by the well treatment chemical deposition from liquid, at that the well treatment chemical is adsorbed on the water-insoluble adsorbent, and where the well treatment chemical is deposited upon metal salt presence. Well treatment liquid containing the above mentioned composition and carrying liquid. Method of the underground reservoir or wellbore treatment including the above mentioned well treatment liquid injection in the reservoir or wellbore. Method to monitor the well treatment chemical release in the wellbore including the above composition injection in the wellbore. Invention is developed in subclaims.

EFFECT: improved efficiency of treatment in environments with high pH.

38 cl, 3 dwg, 4 ex

FIELD: oil and gas industry.

SUBSTANCE: lightweight plugging material contains cement PTsT-I-100, lightweight - expanded vermiculite, technical salt, chemical agent Crep, at the following ratio in wt %: cement PTsT-I-100 - 84.75; vermiculite - 9.42; Crep - 1.13; NaCl - 4.7. During the cement slurry preparation - expanded vermiculite, technical salt.

EFFECT: exclusion of the hydraulic fracture during wells cementation due to improved parameters of the packing cement, increased strength of cement stone at low and moderate temperatures at early stage of solidification upon simultaneous density reduction of the cement slurry.

1 tbl

FIELD: chemistry.

SUBSTANCE: reagent for treating drilling mud contains 94-96 wt % ferrochrome lignosulphonate and 4-6 wt % ammonium polyphosphate.

EFFECT: improved dilution properties of the reagent in salt mud, high thermal stability and environmental safety of the reagent.

3 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention mainly relates to methods of hydrocarbons production from hydrocarbons containing reservoirs. Method of treatment of the reservoir containing crude oil including stages when: (a) composition is supplied to extract the hydrocarbons to at least part of the reservoir, at that the composition contains at least two internal olefin sulphonates selected from group comprising internal C15-18-olefin sulphonates, internal C19-23-olefin sulphonates, internal C20-24-olefin sulphonates and internal C24-28-olefin sulphonates, and at least one viscosity decreasing compound, that is isobutyl alcohol, ethoxylated C2-C12-alhohol, 2-butoxyethyl, butyl ether of diethylene glycol or their mixture, and (b) composition is provided with possibility to react with the reservoir hydrocarbons. Invention also relates to method of viscosity decreasing of composition of highly active surface-active substance and composition for hydrocarbons extraction.

EFFECT: result is creation of more effective method of hydrocarbons extraction from crude oil containing reservoir.

14 cl, 2 dwg, 2 tbl, 2 ex

FIELD: oil and gas industry.

SUBSTANCE: method of acid treatment of bottom-hole zone of carbonate reservoir includes injection of the acid composition containing in wt %: inorganic or organic acid, or their mixture 9.0-24.0; zwitterion surface-active substance - oleinamidopropylbetaine 1.0-10.0; hydrophobically-modified polyurethane polymer 0.05-3.0; water - rest, at that the acid composition is injected by single stage or by portions with holding between injections. The acid composition can additionally contain anionic surface-active substance in amount of 0.1-3.0 wt %. The above specified acid composition is injected alternating with injection of hydrochloric acid at 12-24% concentration.

EFFECT: alignment of profile of inflow of the production wells in carbonate reservoirs with non-uniform permeability, creation of new fluid conducting channels through entire perforated thickness of the reservoir, restoration of reservoir characteristics of bottom-hole zone due to its cleaning of mud solid particles.

3 cl, 1 tbl, 16 ex, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of water production zone isolation in a well involves sequential injection of coagulation agent (25% solution of calcium chloride), buffer layer of fresh water, and Givpan acrylic reagent. Additionally, polyethylene terephthalate production waste product, PET with low polymerisation degree, is added to Givpan as a filler in amount of 18-24 wt %.

EFFECT: reduced core permeability.

1 dwg, 7 tbl, 3 ex

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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