Method for limiting water influx in oil wells. RU patent 2506408.
| Method for cementing compaction for gas wells / 2506407 Invention is related to gas industry and it can be used during remedial cementing of gas and gas condensate wells in operation process in order to compact and recover gas permeability of cementing and namely cement sheath. Carbon dioxide is used as a reagent in the method of cementing compaction for gas wells that includes treatment of cement stone by reagent pumping to annular space thus forming insoluble or hardly soluble residue at interaction with calcium hydroxide of cement stone with further creation of supplementary pressure; at that treatment of cement stone is implemented at gas intake capacity from 0.1·10-3 up to 6.7·10-3 m3 /(h·MPa) and zero water intake. |
| Composition and method for extraction of hydrocarbon fluids from underground deposit / 2505578 Composition increasing hydrocarbon fluid extraction ratio from underground deposit includes at least two different types of highly cross-linked expansible polymer microparticles having different chemical structure and average diameter of non-increased particles from about 0.05 up to 5000 mcm. Content of cross-linking agents is from about 100 up to 200000 ppm of labile cross-linking agents and from 0 up to about 300 ppm of non-labile cross-linking agents. The above composition is pumped to underground deposit. |
 Method of development of flooded oil deposit / 2504650Casing is sunk into well to perforate the bed. Oil and water saturation intervals and impermeable seam sizes are analysed. Casing part is cut out to expand the borehole in said interval. Fluid is injected in string for packer to define the bed specific capacity. Fluid circulation is defined by injecting fluid via casing string-borehole annulus. In case circulation exists, isolation composition is injected to produce isolation bridge inside casing string 20-30 m above perforation interval. In case circulation does not exist, isolation composition is discharged via casing string-borehole annulus to interval of perforation of oil-and water saturated bed zone to fill expanded bore expanded interval with isolation composition. After hardening of isolation composition, isolation composition is drilled to produce the shield opposite said saturated zone. Isolation quality is analysed. Bed perforation is repeated to resume its development. |
| Method of well absorption zone isolation / 2504641 Proposed method comprises simultaneous-separate injection of two flows of water isolation composition in well tubing. Injected first flow comprises the mix of 93.455-95.470 wt % of clay drilling mud, 4.5-6.5 wt % of ethyl acetate and 0.030-0.045 wt % of AF-grade neonol. Injected second flow, equal in volume to first one, comprises 100 wt of high-molecular liquid glass SILICONOM BN-M. |
| Method of well water production zone isolation / 2504640 Proposed method comprises making the mortar to be injected to well and forced into interval to be isolated. After injection of mortar into well in amount of 10% of total amount, portion of fibro fibers is added thereto under mortar jet. First portion of fibro fibers is fed in 3 mm length, minimum, and in minimum amount of 1 kg per 1 m of mortar. At insignificant increase in injection pressure, 2nd, 3rd and 4th portions of fibro fibers (6, 12, 18 mm-long) are added in portions of 2-5 kg per 1m of mortar till pressure of 70-90% of permissible pressure to operating string or to pools. Injection is terminated to force mortar with fibro fibers, process fluid to permissible pressure to string or to pools. Solution residues are washed off by back-flushing. Well is closed for mortar hardening period. |
 Fluid media for pre-treatment of formation, which contain peroxides, and methods referring to them / 2501942Method involves production of cleaning fluid medium containing peroxide-forming compound and fluid medium on water basis; arrangement of cleaning fluid medium in an underground formation; removal of contaminants at least from some part of the underground formation for formation of a cleaned section of the formation; production of a consolidating agent; arrangement of the consolidating agent at least on some part of the cleaned formation section; and provision of conditions for sticking of the consolidating agent at least to some amount of non-consolidated particles in the cleaned formation section. As per the other version, the method involves the above, where the cleaned section includes at least some amount of cleaned flow movement routes. |
| Method of well abandonment / 2499127 Proposed method comprises well killing and making gastight partition. Proposed method comprises the following stages: cutting and removing of casting string section in interval of productive bed impermeable thickness. Removal of backfill opposite cut section. Borehole reaming via cut section with creation of annular cavity. Filling of said annular cavity and in-column space with barite pulp. Precipitation of barite pulp solid particles in said annular space. Barite pulp fluid features density to allows excess of column hydrostatic pressure over formation pressure. |
 Composition for isolation of behind-casing flows and bed high-permeability zones / 2499020Proposed composition comprises 100 wt % of silicic acid ethyl or methyl ether or mixes thereof, 15-50 wt % of polar solvent, 1-3 wt % of chlorides of IV-VIII group metals, and additive representing polypropylene in amount of 0.1-0.5 wt %. |
 Method for making-up grouting compound in well / 2498047Perforated joint with centraliser and landing ring is run-in at tubing to production string. Gelling agent and soil stabiliser are pumped one by to tubing one through by-pass plug and then mixing of gelling agent and soil stabiliser is made during liftup of the perforated joint at tubing. At that mixing is made under pressure in order to receive grouting compound with required setting time. |
| Method for waterproofing work in fractured manifolds / 2496970 In method for waterproofing work in fractured manifolds, which involves subsequent pumping to an isolated formation of portions of plugging materials at the pressure that is lower than formation hydraulic fracturing pressure, further abandonment of the well for the time of curing of the plugging material pumped in the last turn, that as the first portion of reinforcing plugging material in water solution of polyacrylamide with weight fraction of polyacrylamide of 0.2-0.6%, proppant with fraction of 20-40 mesh with a coating from organic-silicon compound with concentration of 50-200 kg/m3, is pumped, which has physical and chemical similarity to curing plugging material; then, fresh water is pumped in the volume equal to 1.5-2 volumes of water solutions of polyacrylamide, and as the second portion of curing plugging material there pumped is organic-silicon plugging composition. |
| Light-weight grouting mortar / 2244098 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. |
 Method of insulating formation water inflow / 2244115Invention 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. |
| Method for isolating penetrable beds in a well / 2244803 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. |
| Grouting composition / 2244804 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. |
 Method for blocking high-penetrable watered oil beds / 2244820Method 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. |
 Method for blocking high-penetrable watered oil beds / 2244821Method 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. |
 Method for blocking high-penetrable watered oil beds / 2244822Method 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).212H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn. |
 Method for isolating influx of foot water and fixing of well-adjacent gas wells bed zone of deposits with abnormally low bed pressure / 2245438Method 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. |
| Method for isolating absorption zone in a well / 2245987 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. |
| Method for isolating fluid-influx area in a well / 2245988 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. |
FIELD: oil and gas industry.
SUBSTANCE: invention pertains to operation of oil and gas wells, and namely to methods for limiting water influx in oil wells, wells. Bituminous-mineral cement composition consisting of bitumen-containing reagent and mineral powder is pumped into stratum. Bitumen emulsion is used as bitumen-containing reagent and well cement is used as mineral powder. Bitumen emulsion makes from 1 up to 10% of weight of dry well cement. After preparation and pumping bituminous-mineral cement composition is held till it hardens in water-bearing part of the stratum and dilutes in oil-bearing part of the stratum. Further the well is washed with subsequent holding till complete hardening of the composition in water-bearing part of the stratum with subsequent removal from oil-bearing part of the stratum during well development.
EFFECT: invention allows increasing efficiency and quality of remedial cementing by increasing stability of the formed bituminous water shutoff screen, reducing its fragility and labour intensity.
Offer applies to the exploitation of oil and gas wells, namely to a method of limitation of the water in oil wells during drilling and operation of oil and gas wells.
Known methods of application product as a reagent for increasing oil recovery and processing of oil formation (patent RU №2140529, IPC 21 43/22, publ. 27.10.99,) made through injection composition to block aquifers, which is a neftebitumen product, extracted from producing wells in the field of high-viscosity oils and bitumens of various physical and chemical methods - steam-and-gas, , burning, injection of chemicals. Way of limitation of the water is injected in order product or solutions with chemical agents or polymers, or hydrocarbon solvents, which are used as tonkoizmelchennye materials (mineral powders, propylene, chalk, carbon black, epoxy, plastic, rubber, sulfur and others), powdered polyacrylamide, lignosulfonate, hydrocarbon solvents (spent absorbent, isopropanol), surface-active substances (AF 9-12 , OP-10, petroleum sulfonates sodium), . Injection product and chemical reagents can be applied simultaneously or sequentially. However, when the use of chemicals in the form of finely shredded materials solution with their product is subjected to mechanical activation and mixing in installations.
Disadvantages of this method are the multistage and the volume of work associated with high viscosity product and complexity of preparation of compositions on its basis in field conditions, due to which before injection into the layer you want to preheat or mixing it with a hydrocarbon solvent to reduce the viscosity, which leads to a considerable increase of material costs, when using technology.
The closest in the technical nature of the alleged invention are reagent for increasing oil recovery and limitation of the water in the wells and the way of processing of the oil reservoir (patent RU №2230900, IPC 21 43/32, publ. 20.06.2004). According to the invention, the way of insulation work includes preparation and injection into the reservoir reagent or its mixture with hydrocarbon solvent and/or mineral powder, as a hydrocarbon solvent use oil or residual production of ethylbenzene and styrene resin «», and in the capacity of mineral powder - bentonite clay.
Disadvantages of this method are the complexity of the method associated with the complexity and duration of the preparation of bitumen-mineral composition of the backfill, its complexity, the need to use the pure oil as a hydrocarbon solvent, as a consequence, the high cost of technology. Also, when downloading bitumen-mineral tamping composition containing bitumen emulsions with hydrocarbon solvent and bentonite clay, formed screen will have a loose structure and, as a consequence, over time, in conditions of intensive acquisitions and under the influence of aggressive fluids screen will collapse that does not provide reliable isolation of water production, leads to a local nature of this method and need to make repeated work on waterproofing of the reservoir and, as a consequence, additional material costs.
The technical purpose of the proposal is to increase the efficiency and quality of repair and isolation works by increasing the sustainability of produced bitumen-mineral waterproofing of the screen, reducing its fragility, exclude additional cost of re-works to limit water production and reduce the duration and complexity of work.
The task is solved by the method proposed limitation of the water in oil wells, which includes the injection into the layer of bitumen-mineral composition of the backfill, consisting of reagent and mineral powder.
New is that as reagent use of bitumen emulsion, and as a powder mineral oil-well cement and bitumen emulsion is 1 to 10% of the dry weight of the backfill of cement, after preparation and injection of bitumen-mineral composition of the backfill produce exposure to curing bitumen-mineral composition of the backfill in the aquifer of the reservoir, the dissolution of bitumen-mineral composition of the backfill in the bearing part of the layer, and then being rinsed well with subsequent exposure to complete curing of bitumen-mineral the backfill composition, located in the aquifer of the reservoir with the subsequent removal of bitumen-mineral composition of the backfill of oil-bearing part of the layer at development wells.
As backfill used Portland cement grouting -P-50 GOST 1581-96, and as bitumen emulsion - for example, consist of high-viscosity oil extracted on , - fields of the Republic of Tatarstan. High-viscosity oil recover after installation of preliminary water discharge) density of not lower than 870 kg/m 3 , which represents a natural emulsion with water content of 5-10%.
Way of limitation of the water in oil wells is implemented as follows.
Prepare bitumen-mineral grouting composition, consisting of the backfill cement shut on fresh water when respect 0,5 with the addition of bitumen emulsion in the amount from 1 to 10% of the dry weight of the backfill of cement. All components of bitumen-mineral composition of the backfill mix to equalize and injected into watered stratum using cementing unit for pre-assigned in the hole column of pump-compressor pipes (NKT). After the injection of a bitumen-mineral composition of the backfill in the hole for curing bitumen-mineral composition of the backfill in the layer composition leave achieved under the pressure of not less than 2 hours (determined by experiment), but not more than curing time bitumen-mineral composition of the backfill. After holding produce back washing in the amount of not less than 1.5 volume of tubing, which after washing raise 200-300 m from the topping in the borehole fluid density well killing, and leave a hole on the curing time of bitumen-mineral composition of the backfill (usually 24-48 hours).
When you add in the grouting mortar bitumen emulsion more than 10% by weight of dry tamping cement flowing bitumen-mineral composition of the backfill decreases, which can lead to the increase of discharge pressure bitumen-mineral composition of the backfill and, as a consequence, to the emergence of technological difficulties when leveling (need more time to download bitumen-mineral composition of the backfill in the reservoir, which can lead to its cure directly in the well). Adding bitumen emulsions in oil-well cement mortar less than 1% of the dry weight of the backfill cement formed shell of bitumen emulsion around the particles of cement is thin and in case when its net oil pay in the area of the layer it is suppressed and cement particles in the oil of the reservoir, which makes it difficult to flush. Consequently, the terms of curing bitumen-mineral tamping composition containing bitumen emulsion in the range from 1 up to 10% of the dry weight of the backfill cement, takes 8-12 h, which allows trouble-free pumping of the proposed bitumen-mineral composition of the backfill in isolated by interval.
When downloading the proposed bitumen-mineral composition of the backfill in water-saturated part of the reservoir, it will be curing due to the absorption of water cement, bitumen emulsion on the surface of the adsorbent (cement particles), and if it enters bitumen-mineral composition of the backfill in net oil pay part of the reservoir curing not happen due to the exclusion of the process of hydration of cement in hydrocarbons environment due to the fact, that bitumen emulsion soluble in hydrocarbon fluid, which leads to leaching of bitumen-mineral composition of the backfill of oil of the reservoir and this is due to the selectivity of the proposed technology. After exposure, sufficient for the curing of the cement, caught in a net oil pay part of the reservoir and diluted produced oil bitumen-mineral grouting composition is washed out of the collector in the beginning of the reservoir. The resulting screen in water-bearing part of the layer is resistant to aggressive media, that can be used to limitation of the water in the conditions of the hydrogen sulfide aggression, providing reliable insulation layer.
Preparation of bitumen-mineral composition of the backfill is as follows.
For the evaluation of the effectiveness of the proposed method in the laboratory conditions by the standard method according to GOST 26798.1-96 at a temperature of 20 + or-2 OC and atmospheric pressure were identified strength properties of bitumen-mineral composition of the backfill. The trials for the most similar fashion not conducted, because the strength of the clayey mass of the formulation used so small that it cannot be formed required for testing according to GOST 26798.1-96. The fragility of bitumen-mineral stone backfill was defined as the ratio of the strength of bitumen-mineral stone backfill compressive strength Flexural strength. The results are given in the table.
Test ability of the proposed method was carried out on models of the reservoir length of 30 cm and an inner diameter of 2.7 cm filled with quartz sand fraction of 0,2-0,3 mm Initially through the formation model pumped water, spend metering consumption and determine the initial permeability of the model. Further, through the model of the pump bitumen-mineral grouting composition. Number of uploaded bitumen-mineral composition of the backfill equal to the pore volume of the reservoir model. Model left for 24 hours with the purpose of curing bitumen-mineral composition of the backfill, after which pumps the water, the formula Darcy determine the permeability and calculate insulation coefficient, which characterizes the degree of clogging the pores and is a measure of the effectiveness of the insulation work.
The results of the study ability bitumen-mineral composition of the backfill of the proposed method and the closest analogue is presented in the table.
From obtained results follows, that bitumen-mineral tampon formulations containing bitumen emulsion from 1 to 10% of the dry weight of the backfill cement, have the best strength properties. When the content of bituminous emulsion more than 10% by weight of dry tamping cement strength properties of bitumen-mineral stone backfill deteriorate. The presence of bitumen emulsion from 1 to 10% of the dry weight of the backfill of cement in the bitumen-mineral composition of the backfill reduces fragility of bitumen-mineral stone backfill, indicating greater formed stone. Also the additive bitumen emulsion provides for the increase of corrosion resistance of bitumen-mineral stone backfill, which is due to the fact, that bitumen emulsion by hydrophobization then, reduces the permeability of cement stone.
TableResults of tests
Indicators
Content in bitumen-mineral composition of bitumen emulsion, % of mass of the backfill cement
0,5 1 5 10 11Water / cement ratio
0,5 0,5 0,5 0,5 0,5Density, kg/m 3
1850 1800 1780 1750 1740Flowing on this Institute became a cone, mm
220 219 210 190 175Curing time, h min
- the beginning
7-30 8-10 9-00 9-35 10-50 - end of 9-20 10-00 11-15 12-00 13-00Bending strength, MPa - 7 days
5,0 5,9 5,76 5,25 4,13Compressive strength, MPa - 7 days
14,5 to 16.37 15,47 13,76 of 10.52Bending strength, MPa - 180 days
3,5 5,4 5,61 4,98 4,0The fragility of bitumen-mineral stone backfill
2,9 2,77 2,69 2,62 2,55Insulation factor in 2 days, %
100 100 100 100 100Insulation factor 6 months, %
98 98 94 96 96The closest analogue
Insulation factor in 2 days, %
100Insulation factor 6 months, %
78Within 3 months of storage of bitumen-mineral cement stones in the formation water containing hydrogen sulphide, a decrease of strength of bitumen-mineral cement stones not occur, and after 6 months of storage in the reservoir water containing hydrogen sulphide, a decrease of strength is insignificant, that lets say about resistance bitumen-mineral cement stones to aggressive media.
The presented results show that the coefficient of the insulation under the proposed method after 24 h at 100%, and 6 months. - 94-98%, and the closest analogue respectively 100 and 78%.
Besides, while having damping properties, asphalt emulsion provides increase of its shock resistance, which is particularly valuable during well operation. Studies of the obtained cement stones at their storage in the reservoir water for more than 6 months have shown that the change of their linear dimensions not happened, i.e formed cement stone water racks at the expense of education in the structure of hydrophilic of cement waterproofing bitumen films.
In relation to the closest analogue of the use of bitumen emulsion in bitumen-mineral composition leads to the increase of corrosion resistance of the backfill stone by hydrophobization then formed the backfill stone and reduce its fragility.
All of the above causes low permeability of the backfill stone and increases the well operation time until the re-watering. In addition, unlike the prototype no additional operations on preparation reagent in the claimed method simplifies the way limitation of the water in oil wells, reduces the duration of the operations and, as a consequence, reduces their cost.
An example of practical application.
In the well # 7890 with a diameter of casing 168 mm geophysical methods was set interval water inflow in the interval 1430-1435 M. Prepared with the use of the above mentioned special technique and methods of 15 m 3 bitumen-mineral grouting composition of fresh water and Portland cement -II-50 with the addition of 6% of the bitumen emulsion from the dry weight of the backfill of cement. Download cooked bitumen-mineral grouting composition into the well through pre lowered into a borehole to a depth of 1,400 m 73 mm tubing. Next produced bitumen-mineral composition of the backfill process liquid density 1,180 kg/m 3 in the amount of 4.7 m 3 . After bitumen-mineral composition of the backfill passed bitumen-mineral grouting composition under pressure within 2 hours After exposure fired back washing fresh water wells in the amount of 6.4 m 3 . After washing lifted the drill pipe to a depth of 1100 m with the topping of the well of fresh water and left a hole on the waiting time hardening of cement (RFQ) in bitumen-mineral part in 48 hours As a result of watering wells decreased from 97% to 84%, which led to the increase in flow rate from 0.9 to 3.9 tons/day.
Thus, the proposed method limitation of the water in oil wells to increase efficiency and quality of repair and isolation works by increasing the stability of the formed bituminous waterproofing of the screen, reducing its fragility, exclude additional cost of re-works to limit water production and reduction of the labor intensity.
Way of limitation of the water in oil wells, including injection into the layer of bitumen-mineral the backfill composition consisting of reagent and mineral powder, wherein in the capacity of reagent use of bitumen emulsion, and as a powder mineral - oil-well cement and bitumen emulsion is 1 to 10% of the dry weight of the backfill of cement, after preparation and injection of bitumen-mineral composition of the backfill produce exposure to curing bitumen-mineral composition of the backfill in the aquifer of the reservoir, the dissolution of bitumen-mineral composition of the backfill in the bearing part of the layer, and then are rinse the wells, followed by exposure to complete curing of bitumen-mineral composition of the backfill, located in the aquifer of the reservoir with the subsequent removal of bitumen-mineral composition of the backfill of oil-bearing part of the layer at development wells.