Method to insulate absorption zone in well

FIELD: oil and gas industry.

SUBSTANCE: method to insulate an absorption zone in a well includes portion preparation of plugging compositions based on acetone-formaldehyde resin and liquid glass that harden in presence of structure formers, their pumping into a well and placement in an absorption zone. During preparation of two separate portions of plugging compositions, a gel powder and a structure former for liquid glass are added into a portion from acetone-formaldehyde resin, a structure former for acetone-formaldehyde resin is added into a portion of liquid glass, and structure formers are represented by accordingly a phosphogypsum and a 15% aqueous solution of caustic soda, besides, pumping and movement of plugging composition portions in the well is carried out by two contactless flows, and mixing of flows is carried out upstream the absorption zone at the ratio of 1:1 with the following ratio of components, wt parts: the first flow: acetone-formaldehyde resin 120, gel powder 25, phosphogypsum 40, the second flow: liquid glass 105, 15% aqueous solution of caustic soda 30.

EFFECT: increased efficiency of repair insulation works under conditions of high absorption due to prevention of hydraulic insulation screen washout in process of its formation.

2 tbl

 

The proposal relates to the oil industry, in particular to methods isolation zone absorption in the borehole, and can be used for repair and insulation works in conditions of large acquisitions.

There is a method of isolation of water and the absorption by dual injection in the irrigated part of the formation of two streams: one stream - gipan, liquid glass, water, other aqueous hydrochloric acid solution of 0.44 to 4.0% (Patent RU №1774689, IPC EV 33/138, publ. BI No. 1, 1996). After mixing flows into the borehole additionally inject an aqueous solution of acid.

The main disadvantage of this method is the duration of keeping well for hardening plugging mixture (at least 48-72 hours), thereby waterproofing the screen to blur in fast-absorbing area of the reservoir directly in the process of its formation.

The closest to the technical nature of the claimed method is a method of isolation zones absorption layer by successive injection of portions of liquid sodium, suspension of gypsum chemical water-based, water glass, sodium and suspension of gypsum chemical in a mixture with formaldehyde resin and an acid curing agent (Patent RU No. 2391489, IPC EV 33/13, SC 8/502, SC 8/508, publ. BI No. 16, 10.06.2010,). The disadvantages of the method from which the input:

- sedimentation sedimentation phosphogypsum from aqueous suspensions and sticking it on a metal surface oilfield equipment, resulting technological difficulties arise when pumping water suspension into the well, and also reduces the quality and reliability of the insulation screen due to the lack of phosphogypsum when linking with liquid glass;

- long structure (not less than 48 h) plugging mixture, which affects the success of the waterproofing works in conditions of intensive acquisitions.

The technical objective of the proposal is to increase the efficiency of repair and insulation works in conditions of large acquisitions by preventing complications during repair and insulation works by eliminating deposition of phosphogypsum, as well as reduce repair time well.

The problem is solved by means of isolating the zone of absorption in the borehole, including a La carte cooking, pumping into the well and placing in the absorption zone hardening in the presence of builders cement composition based on acetonitriles resin and liquid glass.

What's new is that in the preparation of two separate portions of the cement composition into the portion of acetonitriles resin injected bentonite and the amendment to W is Drago glass, in a portion of the liquid glass introduced the amendment to acetonitriles resins, which are used respectively phosphogypsum and 15%aqueous sodium hydroxide solution, and injection and movement of portions of the cement composition in the well implement two contactless flow and mixing flows is carried out before the absorption zone in a ratio of 1:1 in the following ratio of components, mass:

first thread:

oceanfarmasea resin- 120
the bentonite- 25
phosphogypsum- 40

second thread:

liquid glass-105
15%aqueous sodium hydroxide solution- 30

To implement the method using acetonitrile resin on THE 2228-006-48090685-2002; bentonite on THE 390147001-105-93 with ISM. No. 1-3; phosphogypsum brand And THE 2141-677-00209438-2004, glass sodium liquid according to GOST 13078-81 (liquid glass), caustic soda according to GOST 2263-79.

The essence of the invention lies in the isolation zone absorption in the well in the process of re is onto insulation works by forming it of plugging mass, formed by mixing the components of the proposed cement composition.

In the preparation of components of the first portion of the bentonite is mixed with acetonitriles resin, forming a homogenous suspension. Adding phosphogypsum and stirring suspension sedimentation deposition of phosphogypsum is not happening, and he never sticks to the metal surface oilfield equipment for injection into the well due to the fact that is suspended in the clay suspension resin having thixotropic properties. For the preparation of the second portion of the mixed liquid glass and 15%aqueous sodium hydroxide solution, forming a homogeneous solution. Download and movement of portions of the cement composition in the well implement two contactless flows, for example, one stream is pumped through the annular space, and the other on the column tubing (tubing).

When mixing the components of the two streams before absorption zone phosphogypsum reacts with liquid glass, which leads to thickening of cement composition, and 15%aqueous sodium hydroxide solution reacts with acetonitriles resin, resulting in a dense cement mass in the zone of absorption.

In the laboratory have established the optimal ratio of components campomanesia, while focused on the beginning of the structure 30 minutes after mixing of the components of the cement composition so that when it enters the zone of absorption of the composition quickly formed waterproofing screen and not washed out. As the Foundation of the cement composition is oceanfarmasea resin, first defined the required amount and concentration of amendment - sodium hydroxide solution at 120 mass acetonitriles resin (100 ml), the determination results are shown in table 1.

The start time of the structure was determined as follows. In a glass beaker with a volume of 250 ml was stirred estimated number of components of the cement composition, and the time at which the meniscus of the liquid ceased to move, was taken during the beginning of the structure.

The results (table 1) was selected 30 mass 15%caustic soda solution at 120 mass acetonitriles resin with a start time of the framing 30 minutes, sufficient for the formation of waterproofing screen and block the absorption zone with further compaction of the backfill mass for several hours before the state of the stone.

Table 1
The results determine the amount and to whom ncentratio caustic 120 mass. including acetonitriles resin
The amount of aqueous solution of caustic soda, mass. PMThe start time structuring acetonitriles resin aqueous sodium hydroxide solution with different concentrations, min
10%15%20%10%15%20%
2020201006020
303030703015
404040502010

It was further determined the required amount of bentonite phosphogypsum and liquid glass on 120 mass. including acetonitriles resin, the results of the tests are presented in table 2.

The number of phosphogypsum and liquid glass was chosen for the optimal time to start structuring composition (30 min) and ETS is mentation sustainability of the cement slurry. As can be seen from table 2, the reduction treatment was less than 25 mass. including phosphogypsum less than 40 mass. hours leads to its deposition, and the increase of bentonite in the stream up to 30 mass. including phosphogypsum to 50 mass. hours leads to netaccess cement slurry after mixing. In the composition containing 120 mass. including acetonitriles resin, 25 mass. including bentonite, 40 mass. including phosphogypsum and 105 mass. including liquid glass, subsidence phosphogypsum is not happening, the start time of the framing of grouting composition is 30 minutes with Results of model tests confirmed that this structure is optimal for creating durable waterproofing of the screen in the absorption zone.

The test of the ability of water composition on the proposed method and the prototype was carried out on models of the formation length of 30 cm and an inner diameter of 2.7 cm, filled with quartz sand fraction 0.2-0.3 mm, which allows to simulate the injection of reagents into the reservoir. Model of the reservoir was filled the reservoir with water, then poured the grouting composition ratio of the components according to the proposed method, and leave a response. The amount injected was equal to the pore volume of the reservoir model. After 24 h, water was pumped and determined the pressure breakthrough. The results of model testing are presented in table 2, in which it is clear that in hitlerowsa the ability of the composition according to the proposed method is not inferior to the prototype even if the shutter speed on structuring within 24 hours, in contrast to 48 hours from the prototype.

A specific example of the method.

Work carried out in the oil well with the production column with a diameter of 146 mm, the current slaughter 1785 m depth 1328 m revealed the violation of the integrity of the production casing with a specific pickup 6.1 m3/(h·MPa). When implementing the method in the well to a depth of 1325 m pulled the column tubing with a diameter of 73 mm Produced the preparation of a mixture of 12 t acetonitriles resin; 2.5 tons of bentonite and 4 t of phosphogypsum. For this purpose, a mixture of bentonite and phosphogypsum SATARIEL in semanticmediawiki unit and shut this mixture on acetonitriles resin, similarly to the preparation of cement mortar. The mixture acetonitriles resin, bentonite and phosphogypsum has pumped out in orignially capacity. In the standard two cementing units type CA-im up to 10.5 tonnes of liquid glass and 3 t 15%aqueous sodium hydroxide solution. Later in the borehole at the same time separately pumped portions of the cement composition in the form of two contactless flow, the mixture acetonitriles resin, bentonite and phosphogypsum (first thread) for the annular space, and 10.5 tons of liquid glass and 3 t 15%aqueous sodium hydroxide solution (second thread) - on the tubing string, and supported the consumption of the first pump unit is 20% higher flow rate of the second pump unit. The output is of the tubing is the blending of 2 threads, and in the interval the integrity of the production casing pump already finished the grouting composition. Punching cement composition in the range of violations made by injecting into the well the fluid - reservoir water. Next, the tubing raised to a depth of 1100 m and left well at the time of structuring the composition within 24 hours the Well compressed by a pressure of 20 MPa for 30 min and the results of the pressure testing has shown that the operational sealed column.

The use of the proposed method will improve the efficiency of repair and insulation works in conditions of large acquisitions by preventing complications during repair and insulation works by eliminating deposition of phosphogypsum. By reducing time structuring cement composition reduced the time and cost of repairing wells 5-15%. Due to the rapid hardening is eroded waterproofing screen in the process of its formation, which increases efficiency by 20-30%.

Table 2
The results of the test cement composition
The grouting composition Time structuring compositionThe exposure time in the reservoir model, hPressure break, MPa/m
The first thread MASCSedimentation stability after mixing of the components of the first streamThe second stream, mass. PM
Acetone formal digidna resinThe bentonitePhosphogypsumGlass liquid sodium15%aqueous sodium hydroxide solutionStart, minEnd, h
1201520phosphogypsum settles1203012023-
1202030phosphogypsum settles110309018
1202540fluid homogeneous. solution105303010246,0
1203050stagnant solution9030103--
The composition of the prototype485,0
The composition of the prototype reproduced and tested by the applicant.

Way to isolate the zone of absorption in the borehole, including a La carte cooking, pumping into the well and placing in the absorption zone hardening in the presence of builders cement compositions based on acetonitriles resin and liquid glass, characterized in that in the preparation of two separate portions of the cement compositions in a portion of acetonitriles resin is injected clay is Orasac and the amendment to liquid glass, in a portion of the liquid glass introduced the amendment to acetonitriles resins, which are used respectively phosphogypsum and 15%aqueous sodium hydroxide solution, and injection and movement of portions of the cement compositions in the well implement two contactless flow and mixing flows is carried out before the absorption zone in a ratio of 1:1 in the following ratio of components, parts by weight:

first thread:
oceanfarmasea resin120
the bentonite25
phosphogypsum40
second thread:
liquid glass105
15%aqueous sodium hydroxide solution30



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method includes first discharge of excessive pressure from annular spaces down to atmospherical value, then to plug macrochannels and microchannels of fluids migration, annular and borehole spaces are filled to the upper zone of the wellhead with a sealing liquid on the basis of an aqueous solution of saponified tall oil pitch with concentration from 5 to 17%, containing 1-5% of carbon mixture having high reaction capacity by means of at least its single free topping or pumping into annular or borehole spaces under pressure, at the same time well tightness is identified in annular spaces by drop of excessive pressure down to zero values using a pressure gauge or fluid flow rate from a flow meter from annular spaces of the well.

EFFECT: liquidation of annular pressures and annular crates, prevention of gas saturation in near-surface borehole deposits, prevention of conditions for occurrence of explosions and fires at the area adjacent to the wells.

2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to well construction, particularly backfill compositions used when cementing casing columns, mainly with high gas ratio. The backfill contains portland cement, oxyethylcellulose, a plasticiser, an antifoaming agent - modified organosilicon reagent POLYCEM DF, a modified vinyl acetate copolymer GASBLOCK and water. The backfill additionally contains an expansion agent - calcium oxide or calcium hydrosulphoaluminate and a setting accelerator - calcium chloride, the plasticiser is a substance the active ingredient of which is sulphonated melamine formaldehyde (CEMPLAST MF), or a product of condensation of naphthalene sulphonic acid and formaldehyde S-3, or polyether carboxylate (Melflux), with the following ratio of components, pts.wt: portland cement 95.0-99.9; modified vinyl acetate copolymer GASBLOCK 1.0-2.0; said expansion agent - up to 5.0; oxyethylcellulose 0.3-0.5; said plasticiser 0.6-0.8; calcium chloride - up to 2.0; said antifoaming agent 0.1-0.2; water 47-52. Total weight content of the dry mixture of cement and expansion agent is equal to 100 pts.wt, and total weight ratio of the modified vinyl acetate copolymer GASBLOCK and the expansion agent in the material is equal to 1:(2.5-5.0), respectively.

EFFECT: preventing migration of gas in the columned space after well cementing using the disclosed backfill.

4 cl, 2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: in insulation method of formation water inflow in the well and lining method of bottom-hole formation zone, which involves pumping of mixture of silicon-containing substance with carbamide-formaldehyde concentrate or products on its basis, as silicon-containing substance there used is organic silicon substance or their mixture, or non-organic silicon substance at the following component ratio, wt %: silicon-containing substance 60.0-95.0, carbamide-formaldehyde concentrate or products on its basis 5.0-40.0. Method has been developed in dependent claims.

EFFECT: increasing water inflow insulation degree owing to creating high filtration resistances in porous medium and improving oil-sweeping properties of pumped compositions, and eliminating sand ingress.

6 cl, 4 tbl

FIELD: oil and gas industry.

SUBSTANCE: suspension to be used in oil and gas wells, which contains the following components: aluminium silicate source, carrying fluid, activator of the group including metal silicate, metal aluminate, alkaline activator or their combinations. At that, suspension is capable of being pumped with the composition with such rheological properties that its viscosity is 300 CP or less, and suspension can be cured in well conditions.

EFFECT: obtaining geopolymer suspensions with possibility of monitoring the thickening and hardening periods of time for wide temperature intervals and density, which are capable of being pumped and used for well cementing.

43 cl, 11 tbl, 4 ex

FIELD: process engineering.

SUBSTANCE: invention relates to oil-and-gas industry, particularly, to well cementing equipment. Proposed plane consists of units arranged mobile carriers including pump unit, process fluid receive-and-distribute unit, oil well solution preparation unit coupled with averaging unit, circulation unit, control unit, operator station, control system, piping arrangement equipped with shutoff valves and accessories. Compete set of equipment is arranged in three heated containers that allow delivery to sites by sea, rail or air, including delivery by helicopters. Container design allows mounting containers into integral unit at cementing site. Proposed plant is equipped with heat protection, ventilation, heating and illumination systems that allow access to all their components.

EFFECT: high reparability and mobility.

11 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: isolation method of productive formation from bottom water inflow involves well drilling with opening of productive formation and arrangement of the working face below the level of oil-water contact (OWC), installation of casing pipes above OWC level with further cementing, cleaning of the well below casing pipes, pumping of waterproofing sealant to the cleaned well zone with isolation of bottom water and perforation of casing pipes. Well is drilled in two stages, the first one of which is performed with the main shaft to the roof of productive formation, and the second one - with pilot shaft of smaller diameter. Formation properties are investigated, and the main shaft is deepened to the level located above OWC level before casing pipes are installed. Shaft cleaning below casing pipes is performed after cementing by drilling the pilot shaft with the bit of larger diameter below OWC, and OWC zone is perforated.

EFFECT: method provides the creation of a reliable screen in OWC zone owing to avoiding the operation used for creation of sand-clay plug and cleaning of the well shaft in OWC zone after it is drilled and reinforced with casing pipes, creation of reliable waterproofing screen due to OWC zone perforation, reduction of costs for waterproofing sealant, which is due to the fact that it is pumped directly to OWC zone after perforation.

4 dwg

FIELD: oil industry.

SUBSTANCE: the method for formation acid treatment includes detecting zones of various openness in the treated formation, injecting a portion of hydrochloric acid solution into the higher openness zone, subsequent squeezing of viscous fluid based on oil by the hydrochloric acid solution with a surface-active agent, squeezing of the hydrochloric acid with the surface-active agent into the lesser openness zone in cyclic mode, extraction of used hydrochloric acid from the well at the final cycle, furthermore, the concentration of hydrochloric acid is reduced with every cycle of its application.

EFFECT: increased method efficiency caused by improving durability of insulating screen while reducing its production cost, expanding formations treated by the method along the formation depth and width, simplified treatment process.

17 cl, 2 tbl, 1 ex, 1 dwg

FIELD: mining.

SUBSTANCE: the invention relates to method of well bore maintenance in an underground formation, and to cement composite used for well bore maintenance in an underground formation. The method of well bore maintenance in an underground formation includes preparation of cement composite containing water, cementing material and gas hydrates inhibitor, and placement of the said cement composite into the well bore. The cement composite used for well bore maintenance in an underground formation contains water, cementing material and gas hydrates inhibitor.

EFFECT: production of cements with new composition.

21 cl, 2 ex, 3 tbl

FIELD: oil-and-gas production.

SUBSTANCE: in compliance with proposed method, well is killed, blowing valves and accessories are dismantled up to case head whereon blowout equipment is mounted. Well tubing is withdrawn from the well, blowout equipment is removed to mount coiled tubing equipment that comprises preventer unit. Flexible pipe is lowered into the well, up to its bottom, connected with pump unit to inject mortar via flexible pipe in amount sufficient for well shaft filling and to lift said flexible pipe along well shaft to its head. After mortar thickening, coiled tubing equipment with preventer unit is dismantled to mount bypass coil and central gate valve. String and pip heads as well as central; gate valve are filled with mortar. All branch pipes and top flange of central gate valve are stopped by blank flange and. Thereafter, benchmark is installed.

EFFECT: higher reliability and safety at minimum costs.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: insulation method of water influx to production oil wells involves pumping of gel-forming compound prepared by introducing the carbamide to polymer-colloidal complex obtained by mixing of water colloidal solution of aluminium pentahydroxochloride with 0.2÷0.3 wt % of water solution of polymer; at that, as polymer there used is weakly charged cationic polyelectrolyte with molecular weight of 6·106-20·106 and content of cationic groups of 1.65 to 9.20% molar.

EFFECT: increasing oil production owing to reducing water content of extracted products.

4 tbl, 5 ex, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: invention relates to grouting mortars used for cementing casing pipes of gas, gas-condensate, and oil wells complicated by presence of formations with low hydraulic rupture pressure as well as presence of permafrost rocks. Light-weight grouting mortar contains 47.0-60.0% special-type cement, 6.6-11.8% clinoptilite as light-weight additive, and water. As a result, casing-pipe annulus incidents during boring and running wells are avoided owing to improved parameters of grouting cement, in particular increased sedimentation stability of mortar, dimensional stability and needed strength of cement stone at low positive and negative temperature in early hardening stages are achieved at simultaneous lowering of grouting mortar density.

EFFECT: improved performance characteristics of grouting mortar.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: invention relates to insulating formation water inflow in gas and gas condensate wells with the aid of coltubing techniques. In particular, flexible conduit is descended through the tube space of well operated under pressure to the bottom with the aid of coltubing installation. Latches on tube and annulus spaces are opened. Well hole is filled through flexible conduit with gas condensate. Grouting mortar is prepared in preparation block by mixing cement mortar with setting retardant and mortar flowability enhancer in a calculated amount needed to prevent formation water inflow. Further, flushing fluid, e.g. methanol, is pumped through flexible conduit in amount constituting 0.3-0.6 volume of flexible conduit. Annulus space is closed and grouting mortar is pumped through flexible conduit in amount required to fill well hole in interval of water-inflow part of formation. When grouting mortar in hole rises to specified height, tube space is closed and grouting mortar contained in flexible conduit is forced into water-inflow part of formation by in series pumped flushing fluid and displacing solution: for example first methanol in amount 1.0-1.3 volumes of flexible conduit and then gas condensate in required amount, which however does not exceed internal volume of flexible conduit, until grouting mortar begins being pumped in amount of 0.3-0.5 volumes of flexible conduit. Then tube and annulus spaces of well are opened and gas condensate begins being simultaneously pumped into tube and annulus spaces in order to prevent rise of grouting mortar therein above interval of the water-inflow part of formation. Thereafter, bottom of flexible conduit is raised by 1 m above indicated interval and excess of grouting mortar is cut and washed away with gas condensate passed through flexible conduit into tube space, where excess grouting mortar remains in fluid state. After cement setting expectation time, flexible conduit is descended to the top of cement column and tests the latter for strength applying 4.0-5.0 kN loading by means of injector of coltubing installation through flexible conduit. Finally, cement bridging is subjected to hydraulic pressurization and flexible conduit is removed from well.

EFFECT: enabled formation water inflow insulation without killing of well and restricted pollution of water-inflow part of formation.

3 cl, 1 dwg

FIELD: oil and gas chambers construction.

SUBSTANCE: method includes pumping of portion of water-absorbing acryl polymer, exposure of it in a well, pumping of second portion of same polymer, tempered on fresh water with concentration 1-20%, buffer of fresh water dries up, and before and after pumping of second portion of water-absorbing polymer, tempered on hydrocarbon liquid with concentration 10-20%, buffer of hydrocarbon liquid is pumped in, besides, said 2-portion systems are pumped into well multiple times.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: invention provides grouting composition intended for selective insulation of water inflows into wells, including those occurring under low-temperature and high-permeation oil reservoirs, as well as for suppressing lost-circulating zones and brine inflow zones. Composition including product of hydrolytic etherification of chlorine-containing phenyltrichlorosilane still residues with aqueous alcohol solution contains, more specifically, product obtained by hydrolytic etherification of 100 wt parts of indicated residues with 10-32,8 wt parts of 90-93% aqueous alcohol solution in presence of 10-40 wt parts of orthosilicic acid ethyl ester and, additionally, 15-35 wt parts of chlorine-containing phenyltrichlorosilane still residues at summary content of the two components 133.2-161.6 wt parts. Grouting composition may further contain up to 16.8 wt parts of polar solvent.

EFFECT: lowered repair operation cost, enabled utilization in a wide formation temperature range, including that in high-permeation and low-temperature oil reservoirs, and prolonged shelf time of grouting composition.

2 cl, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum nitrate, chrome nitrate, iron nitrate, magnesium nitrate, barium nitrate, calcium nitrate or their mixtures.

EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding water-isolating compound along tubing pipes, containing polyvinyl spirits and consisting of components forming an impenetrable zone in case of mixing in the bed, pressing it into bed, washing and exposure of well for forming of impenetrable zone, tubing column is lowered for 2-3 meters below perforation range, and into isolation range along tubing pipes hydro-repelling liquid is first pumped, in volume, exceeding volume of water-isolating composition in at least two times, water-isolating composition includes special liquid except from polyvinyl spirits, its pumping is performed in sequence - first goes polyvinyl spirits, then buffer liquid, special liquid, buffer liquid, repeating these operations until reaching required height of isolation interval and fixing of well-adjacent area, after that said pressing, washing of well and said polymerization exposure are performed.

EFFECT: higher efficiency.

1 dwg, 1 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes lowering feeding column into well with mounting of its shoe above ceiling of absorption zone. Along feeding column portions of working liquid are fed into well. As the latter alkali waste of kaprolaktam production or its solution is taken. Working liquid is alternated with portions of its thickener - sodium silicate; alternated by water buffers. Working liquid is pumped at consecutively decreasing concentration. Water buffers are pumped at consecutively decreasing volume. After output from feeding column of first portions of working liquid and its thickener, pumping is continued in cyclic mode with periodical stops of pumping from waves generation condition in such a way, that straight and reflected pressure waves interact in well shaft above absorption zone and below this zone.

EFFECT: higher efficiency.

6 cl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forming a screen of viscous-elastic mass in well via interaction of working liquid pumped into well in form of alkali waste of kaprolaktam production or its solution, with influx liquid. Necessary speed of transformation of viscous-elastic mass and intensiveness of filling of well adjacent area with it is adjusted by mode of pressing of working liquid into influx zone. For this purpose pressure increase is alternated with pressure decrease. Pressure is decreased for 10-50% from achieved maximum pressure. Relation of exposure time for increased pressure to decreased pressure time is taken in limits 1.1-5.0.

EFFECT: higher efficiency.

7 cl, 1 ex

Up!