Isolation method of water influx to well

FIELD: oil and gas industry.

SUBSTANCE: isolation method of water influx to well involves pumping via tubing string to water influx interval of isolation compound, gelling agent and cement solution, technological exposure and development of well. Isolation compound contains the following, wt %: sodium silicate with silica module 2.6-5.0 4-20, water-soluble polymer 0.05-0.3, and fresh water is the rest. Water solution (10-15%) of chlorhydric acid in quantity of 0.5-5.0% of compound volume is used as gelling agent for isolation. Gelling agent is pumped separately after isolation compound is pumped and pumping is performed in cycles. During the first 1 to 3 cycles there used is aerated isolation compound and gelling agent; in next cycles there used is non-aerated isolation compound and gelling agent; then, cement mortar is pumped and process exposure is performed.

EFFECT: increasing efficiency of isolation works.

3 ex

 

The invention relates to the oil industry and can find use in waterproofing works well.

There is a method of isolation of high-intensity intervals acquisitions in the borehole, in which the injection of cement cement slurry, and then the polymer composition, the cement of cement slurry using aerated solution containing the base composition, parts by weight: Portland 85-100, aluminosilicate microspheres to 15, the foaming agent is an anionic surfactant based resin and naphthenic acids from 0.1 to 0.3, the accelerator of terms 4,0-7,0, water 50-60 and optionally gaseous agent in an amount to provide the specified density of the solution 800-1000 kg/m3and as the polymer composition using the polymer paste obtained by mixing the compositions I and II of definite composition (Patent RF №2379474, publ. 20.01.2010).

The known method does not create a reliable insulation screen, because the aeration and consequently weakening subjected to the most durable cement material. The use of highly dispersed silica-alumina microspheres restricts the use of the way areas with pores larger than the size of the microspheres.

The closest to the proposed invention the technical essence is a way of repairs in service is Oh well including the injection into it of hydrophobic emulsion solution, then viscoelastic foam, then a cement solution through the column tubing and abandonment of wells in the waiting period for the solidification of the cement. Viscoelastic foam is prepared on the surface in the following ratio, wt.%: the polymer is 0.5 to 5, the staple of 0.1 to 3, the blowing agent is 0.2 to 5, the aqueous phase 87-99,2. Hydrophobic-emulsion solution has a composition, wt.%: oil 30-50, the aqueous phase 40-68, emulsifier 2-10. Can use different types of polymers, staplers, blowing agents, aqueous phase. To prepare the foam ratio of 0.2-5 is produced when the use of gaseous agents (Patent RF №2322569, publ. 20.04.2008 - prototype).

The disadvantage of this method is the danger of solution for injection, as the staple is administered during the preparation of the composition. In addition, hardening of the foam composition dramatically loses elasticity due to curing of the polymer, which reduces the effect of insulation leakage and eliminate cross-flows in cased wells.

In the proposed invention solves the problem of increasing the efficiency and insulation works.

The task is solved in that in the method of isolation of water in the well, comprising pumping the column tubing in the interval aerated water shut-off composition for insulation and cementos the solution, technological exposure and development wells, according to the invention as a composition for the isolation of use, comprising (wt.%): 4-20 silicate sodium silicate module 2,6-5,0, 0,05-0,3 water-soluble polymer, fresh water - the rest, as the gel using 10-15%aqueous solution of hydrochloric acid in the amount of 0.5 to 5.0% by volume of the composition for insulation, the hydrochloric acid solution is injected separately after the injection of a composition for insulation, injection cycles are, in the first 1 to 3 cycles of use aerated with air or nitrogen compound for insulation and gelling, in subsequent cycles using non-carbonated composition for insulation and gelling.

The invention

When waterproofing works well use foam, aerated solutions that reduce the shrinkage of the insulating material, injecting the insulating material in hard to reach areas. Such solutions contain gelling. However, the introduction of gelling the composition of the insulating material leads to the danger of a premature increase in the viscosity of the composition during injection. The effect of gelling, beginning with the introduction of the composition, may cause the gel water foamed composition will be formed when the composition is injected in place is in string of tubing, what causes loss of pumpability of the composition and the impossibility of the further implementation of the technology. In the proposed invention solves the problem of increasing the efficiency and insulation works due to the batch-sequential injection of carbonated and non-carbonated silicate-polymer composition and gelling. The problem is solved as follows.

When isolation of water are pumped through the column tubing in the interval of water carbonated and non-carbonated composition for insulation and cement, technological exposure and development wells. As a composition for the isolation of use, comprising (wt.%): 4-20 sodium silicate (liquid glass) with silicate module 2,6-5,0; 0.05 to 0.3; the water-soluble polymer, water - else, and as the gel using 10-15%aqueous solution of hydrochloric acid in the amount of 0.5 to 5.0% by volume of the composition for insulation, the hydrochloric acid solution is injected separately after the injection of a composition for insulation, injection cycles are, in the first 1 to 3 cycles of use aerated with air or nitrogen compound for insulation and gelling, in subsequent cycles using non-carbonated composition for insulation and gelling.

Aeration is performed by flow in the discharge line of the air or nitrogen from the compressor to flow from normalnyh (n) m 3/min to 9 N. m3/min. Feed water composition for injection ranged from 0.6 to 18 l/C.

Between the volume of the composition for the isolation and gel-fetch buffer fluid is fresh water.

Insulation works carried out in the following sequence.

Tie the mouth of the well to a straight flush. Pressed discharge line at 1.5 times the expected working pressure (test pressure, for example, 25 MPa).

Determine the injection wells on three modes of operation of the pumping unit pumping of the column tubing saline water density of 1.16-1.18 g/cm3.

Prepared and pumped into the well through the tubing pipes composition for the insulation consisting of a low-modulus liquid glass commodity concentration, hydrochloric acid, fresh water and a water-soluble polymer. The injection is conducted by 4 cycles of the following technological scheme.

1 cycle. Preparing a composition for insulation. For this purpose the pump cementing unit CA-320M trying to enter the volume of liquid glass, the volume of fresh water and produce circulation "on" for 10 minutes. When circulation in the solution add the amount of water-soluble polymer.

Pumped through the column tubing with an open annular valve and neposredno the packer once elitely buffer - the amount of water pumped prepared in the dipstick composition for insulation, at the same time include a compressor and serves nitrogen in the discharge line. Controlling the amount of fluid coming out of the annulus in a bagged truck, as well as the injection pressure gauge compressor. By filling a tared tankers fluid from the annulus to the appropriate mark pumped volume of fresh water. When the compressor is off release the pressure in the discharge line, produce planting packer, closing the annular valve, push in the carbonated layer composition for insulation, which is served in the column tubing volume of hydrochloric acid with the simultaneous supply of the nitrogen compressor, push carbonated composition for insulation in the reservoir volume of saline water.

Cycle 2. Perform as 1 cycle, but the packer not break.

Cycle 3. Perform as a 2 cycle.

4-cycle. Perform as 3rd cycle, but without nitrogen compressor.

Additionally descripsit insulating composition with cement mortar.

Shut the well in and conduct technology exposure.

Learn well, for example, swabbing, pump, injection of nitrogen.

Batch-sequential injection of carbonated composition for insulation and heliobar which the user contributes to the creation of in situ elastic and bulk water screen.

Download after carbonated composition still allows you to create a bottom-hole zone in the area of greatest pressure gradient stronger plot of water screen.

Examples of specific performance

Example 1. In oil well work to limit the inflow into the borehole bottom waters. Main geological and technical data on the well: the perforation interval is at a depth of 2059-2063 m, the flow rate of the liquid 7 m3/day, the water content of 99%, the density of the produced water 1.19 g/cm3artificial slaughter - 2105 m, the current face - 2097,8 m, the diameter of the production casing 168 m, reservoir pressure of 20 MPa.

Insulation works carried out in the following sequence.

Tie the mouth of the well to a straight flush. Pressed discharge line at 1.5 times the expected working pressure (test pressure 25 MPa).

Determine the injection wells on three modes of operation of the pumping unit pumping of the column tubing saline water density of 1.16-1.18 g/cm3.

Prepared and pumped into the well through the tubing pipes composition for insulation. The injection of the composition is conducted by 4 cycles of the following technological scheme.

1 cycle. Preparing a composition for the insulation consisting of (wt.%): 4 silicate sodium silicate m is Golem 2,6, 0,05 water-soluble polymer is carboxymethylcellulose, fresh water - the rest. The volume of the prepared composition is 5.7 m3. As the gel using 10%aqueous solution of hydrochloric acid in the amount of 0.5% by volume of the composition for insulation.

Pumped through the column tubing with an open annular valve and neposredno the packer separation buffer 0.3 m3water pumped prepared in the dipstick composition for the isolation of 5.7 m3filing for unit 2 l/s, at the same time include a compressor and serves nitrogen in the discharge line with a flow rate of 8 N. m3/min. Control the amount of fluid coming out of the annulus in a bagged truck, as well as the injection pressure gauge compressor. By filling a tared tankers fluid from the annulus to the level of 6,05 m3inject 0.1 m3of fresh water. When the compressor is off release the pressure in the discharge line, produce planting packer, closing the annular valve, push in the carbonated layer composition for insulation, which is served in the column tubing 0.3 m3hydrochloric acid 12% concentration with a simultaneous supply of the nitrogen compressor, push carbonated liquid into the reservoir 6.3 m3intralesional water.

Cycle 2. Perform as 1 cycle, but the packer not break.

Cycles 3 and 4. Perform as a 2 cycle, but without nitrogen compressor.

Additionally descripsit insulating cement composition solution of 3.2 m3(4 t).

Shut the well in and conduct technology exposure for 48 hours.

Learn well swabbing.

Example 2. Perform as example 1. As water composition use composition comprising (wt.%): 12 silicate sodium silicate module 3,8; 0,2 water-soluble polymer is polyacrylamide, fresh water - the rest. As the gel using a 12%aqueous solution of hydrochloric acid in the amount of 2.6% of the volume of water composition.

Example 3. Perform as example 1. As water composition use composition comprising (wt.%): 20 silicate sodium silicate module 5,0; 0,3 water-soluble polymer is hydrolyzed polyacrylonitrile; fresh water - the rest, as the gel using 15%aqueous solution of hydrochloric acid in the amount of 5.0% of the volume of water composition.

Production watercut after repair according to examples 1-3 decreased from 99 to 70%. The use of technology to prototype in similar conditions leads to a decrease in the water content of only 4-5%.

Applied to the e of the proposed method will solve the problem of increasing the efficiency of operations to control water production in the well.

The way to isolate water production in a well, comprising pumping the column tubing in the interval aerated water shut-off composition for insulation and cement, technological exposure and development wells, characterized in that the composition for insulation use composition comprising, by wt.%: 4-20 silicate sodium silicate module 2,6-5,0, 0,05-0,3 water-soluble polymer, fresh water - the rest, as the gel using 10-15%aqueous solution of hydrochloric acid in the amount of 0.5 to 5.0% by volume of the composition for insulation, the hydrochloric acid solution is injected separately after the injection of a composition for insulation, injection cycles are, in the first 1 to 3 cycles of use aerated with air or nitrogen compound for insulation and gelling, in subsequent cycles using non-carbonated composition for insulation and gelling.



 

Same patents:

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.

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FIELD: oil and gas production.

SUBSTANCE: procedure for insulation of water production in well consists in successive pumping sodium silicate and 5-15% solution of fluorosilicate ammonia in equal volumes through a buffer of fresh water into a required interval of insulation.

EFFECT: raised processability and efficiency of repair-insulation operations; reduced volume of associated produced water.

2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: method for limiting water influx in well involves subsequent pumping to isolated interval of invert emulsion on the basis of water disperse phase and hydrocarbon disperse medium with organic silicone backfill compound and fixing agent on the basis of organic silicone backfill compound in higher concentration. Before invert emulsion to isolated interval there pumped is water suspension of clay to increase viscosity and stability of emulsion, as organic silicone backfill compound there used is Silor NCh; at that, for invert emulsion in quantity of 1-10% of volume of hydrocarbon dispersion medium, and for fixing agent - with addition of 10% water solution of sodium hydroxide at the following ratios of components, vol. %: organic silicone backfill compound "Silor NCh" 80-90; 10% water solution of sodium hydroxide 20-10.

EFFECT: increasing efficiency of insulating works, duration of effect, increasing overhaul period of operation, excluding metal corrosion of tubing string and production casing.

2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: servicing method of the well shaft involves recovery of sealing composition containing cross-linkable material, cross-linking agent, addition preventing water absorption, water and formiate compound to shorten the time of gel formation of cross-linkable material or retarder of gel formation, which includes chemical compound which is capable of acetylating, hydrolysing, thermal decomposition of organic amine, separately or in combination, so that one or several acids are obtained in the above composition, supply of sealing composition to the permeable zone of the well shaft and exposure of sealing composition for curing. As per the second version, the method involves recovery of sealing composition by means of combination of cross-linkable material, cross-linking agent, addition which prevents water absorption, water and formiate compound to shorten the time of gel formation of cross-linkable material or retarder of gel formation, which includes chemical compound which is capable of acetylating, hydrolysing, thermal decomposition of organic amine, separately or in combination, so that one or several acids are obtained in the above composition, and cement in which the quantity of cement is decreased to effective quantity to increase the time for gel formation of sealing composition approximately to 4 hours or more at the impact of environment in the well shaft on the sealing composition. Then, sealing composition is supplied to permeable zone of the well shaft and exposure of sealing composition is performed till gel is obtained.

EFFECT: improving well sealing efficiency.

20 cl, 2 dwg, 1 tbl, 1 ex

FIELD: oil and gas industry.

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EFFECT: reducing the costs for well construction and well flushing in cavern formation and caving conditions.

FIELD: construction.

SUBSTANCE: invention proposes compositions, capable of setting and including water and cement furnace dust. Compositions, capable of setting, may optionally include an additive, which contains at least one component of the group below: ash dust, slate, slag cement, zeolite, metakaolin and their combinations. Compositions, capable of setting, may be optionally foamed with gas. Also methods of cementing are proposed, which include the following operations: preparation of composition capable of setting; introduction of composition, capable of setting, into a section to be cemented; and making it possible to set and form a hardened mass in this area. Section to be cemented may be located over earth surface or in subsurface bed.

EFFECT: improved operational characteristics.

35 cl, 25 tbl, 25 ex

FIELD: construction.

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EFFECT: increased efficiency of borehole cementation.

17 cl, 25 tbl

FIELD: mining.

SUBSTANCE: method for stabilisation of subsurface part, in which part of subsurface is put in contact with preflush fluid, part of subsurface is put in contact with strengthening fluid, containing resin and water decomposable dissolvent, and after-flushing fluid. Method for reduction of loose material formation from subsurface part, in which part of subsurface is put in contact with preflush fluid, strengthening fluid, containing resin and water decomposable dissolvent, and after-flushing fluid. Method for rupture of subsurface part with control of loose material formation, in which part of subsurface is put in contact with preflush fluid, strengthening fluid, containing resin and water decomposable dissolvent, with fluid for pressure rupture sufficient to develop or grip the fracture in subsurface part.

EFFECT: increased strength of fixation, no loss of permeability.

34 cl, 1 ex, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: in insulation method of brine water influxes in gas well, which involves pumping of buffer, waterproofing composition containing urethane pre-polymer, hydrocarbon solvent and water to the formation, its flushing to the formation, there used as buffer is gas with relative humidity of not less than 10%, as hydrocarbon solvent - acetone, waterproofing composition - prepared in advance by mixing acetone with water with further introduction to the obtained mixture with water concentration of not more than 8.0% of urethane pre-polymer; the above gas is pumped during 30 minutes at pressure which is higher than formation pressure by 1.5-5 times, and then after it is prepared, pumping of the above waterproofing composition is performed, its flushing with acetone, and then pumping of the above gas during 3 hours.

EFFECT: increasing insulation efficiency of gas wells in conditions of formations with abnormally low formation pressure, and increasing flow rate of the above wells.

2 ex, 1 tbl

FIELD: gas-and-oil industry.

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EFFECT: raised quality of formation isolation and increased efficiency of clay coating removal.

1 ex, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: composition for acid treatment of well or bottom-hole formation zone includes chlorhydric acid, corrosion inhibitor and water. B2 corrosion inhibitor production waste is used as corrosion inhibitor and represents salt aqueous solution containing the following, wt %: ammonium chloride 15-18, aromatic amines 4-5, water is the rest, and B2 corrosion inhibitor at the following component ratio, wt %: chlorhydric acid of 27.5% concentration 80-84.9, B2 corrosion inhibitor production waste 15-20, and B2 corrosion inhibitor 0.05-0.15.

EFFECT: lower corrosive activity of composition, which excludes contamination of formation and lower productivity of formation, higher effectiveness of action on formation by slower neutralisation of acid solution, which provides deeper penetration into formation and higher current reservoir recovery, and utilisation of B2 corrosion inhibitor production waste.

1 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: in method of hydrophobic treatment of bottom-hole zone of productive formation, which involves supply to porous-crack space of bottom-hole zone of formation of mixture of surface active substances, well soaking for capillary intake and change-over to hydrocarbon influx mode, there used as the above mixture is the following solution containing the following, wt %: mixture of polyatomic alcohols - by-product during production of mono-, di- and triethylene glycols 75.0-96.0, concentrate of main impurities of production of ethyl alcohol from food raw material 1.0-4.0, intermediate fractions of production of ethyl alcohol from food raw material 0.5-4.0, grain oil 1.0-3.0, neonol 0.5-4.0, hydroxyethylated fatty acids 1.0-10.0, delivery is performed by alternating the above solution with stable condensate, starting from and ending with delivery of stable condensate; well soaking is performed during 24-60 hours; and after that, fluid is discharged from well to plume till the beginning of steady operation of well.

EFFECT: higher efficiency and reliability of hydrophobisation of bottom-hole zone of formation owing to reducing and stopping the water filtration, increasing the influx of hydrocarbons and enlarging the duration of hydrophobisation effect.

2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of ceramic shear proppants meant for use in oil industry as proppants when extracting oil through hydraulic fracturing. The method of preparing a lightweight proppant, involving drying initial components of the mixture, their batching, grinding, granulating the mixture and firing the obtained granules, uses a mixture of the following composition, wt %: quartz-feldspar sand 90.0-97.0, clay and/or kaolin 3.0-10.0, and firing is carried out at heating rate of 350-370°C/h and cooling rate of 800-820°C/h. The mixture is moistened using 2-8% sodium hydroxide and/or potassium hydroxide solution. Components of the mixture are ground to fractions not larger than 40 mcm, with content of the fraction not larger than 5 mcm less than 60 wt %. Said drying is carried out at temperature 200-240°C.

EFFECT: lightweight proppant is characterised by that it is obtained using the method described above.

8 cl, 2 ex, 4 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure for treatment of underground reservoir consists in prediction of multitude of scenarios of reservoir treatment for fluid medium containing polymer and cross-linker with usage of model of rheological properties of fluid medium. The procedure also includes input of data on concentration of polymer and cross-linker, of temperature profile, of pressure and rate of shear during treatment. Further, the procedure consists in determination of concentration of cross-linking and rheology of fluid medium on base of concentration of cross-linking, in selection of scenario for treatment facilitating optimal rheological properties of fluid medium, in preparation and pumping fluid medium into borehole, and in reservoir treatment. According to another version the treatment procedure for underground reservoir consists in predicting multitude of scenarios of reservoir treatment including formulation of fluid medium and schedule of supply of said medium containing polymer and cross-linker with usage of the model of rheological properties. Also, the procedure consists in input of data on concentration of polymer and cross-linker. There is selected a scenario of treatment facilitating optimal rheological properties of fluid medium. Fluid medium is prepared and is pumped into a well, and the underground reservoir is treated. According to one more version the treatment procedure for underground reservoir consists in predicting multitude of scenarios of reservoir treatment including formulation of fluid medium and schedule of supply of said medium containing polymer and cross-linker with usage of the model of rheological properties. Also, the procedure consists in input of data on concentration of polymer. There is selected a scenario of treatment facilitating optimal rheological properties of fluid medium. Fluid medium is prepared and is pumped into a well, and the underground reservoir is treated. The invention is developed in dependent points of formula.

EFFECT: raised efficiency of treatment of carbon containing reservoirs.

21 cl, 1 ex, 1 tbl, 9 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for development of non-uniform reservoir consists in pumping water solution into reservoir. Solution contains wt %: poly-acryl-amide 0.3-1.0, chromium acetate 0.03-0.1, magnesium oxide 0.015-0.07, and water - the rest. Also, poly-acryl-amide and chromium acetate are mixed at ratio close to 10:1. Produced water solution is forced through into reservoir with water in volume exceeding volume of string, through which water is pumped, at not less, than 0.5 m3, with successive process conditioning for period of gelation of water solution.

EFFECT: raised efficiency of development of non-uniform reservoir due to increased strength of gel-forming water solutions of polymer and reduced power expenditures owing to reduced induction period of gel-forming.

1 tbl, 1 ex

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: 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: 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: oil and gas production.

SUBSTANCE: procedure for repair-isolation operations in well consists in pumping grouting mortar into isolated interval. Grouting mortar contains semi-hydrate of calcium and oil at ratio of weight parts 2:1. Further, there is pumped cleaning fluid corresponding to 0.05-0.2% of water solution of non-ionogenic surface active substance. Also, grouting mortar and cleaning fluid are pumped in equal by volume portions. The invention is developed in dependent points of formula.

EFFECT: raised efficiency of repair-isolating operations in well.

3 cl, 1 tbl

FIELD: oil and gas production.

SUBSTANCE: composition for acid treatment of well of bottomhole zone of reservoir consists of hydrochloric acid, corrosion inhibitor and water. As corrosion inhibitor there is used waste of benzaldehyde production corresponding to water-salt solution containing wt %: ammonium chloride 10-20, hydrochloric acid aromatic amines 20-30, water - the rest, and additionally - acetic acid at the following ratio of components, wt %: hydrochloric acid of 27.5% concentration 79.9-89.9, waste of benzaldehyde production 10-20, acetic acid 0.1-1.0.

EFFECT: essentially reduced corrosion activity of composition eliminating contamination of reservoir and reduction of its yield, raised efficiency of influence on reservoir by retarded neutralisation of acid solution facilitating more deep penetration into reservoir and its increased oil yield; utilisation of waste of benzaldehyde production.

1 tbl, 1 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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