Method for isolating penetrable beds in a well. RU patent 2244803.
 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. |
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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. |
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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. |
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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. |
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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).2 |
 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. |
 Plugging mix / 2245989Plugging mix intended for cementation of oil, gas, and gas condensate wells under moderate and elevated temperatures contains 50-76% Portland cement, 20-40% finely ground quartz, and caustic magnesite powder. |
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Plugging composition / 2245990 Portland cement-based composition contains, wt %: polymer 1-10, hardening accelerator 6-8. plasticizer 0.3-0.5, alumina cement 7-10, gypsum dihydrate and/or anhydrite 5-8, said polymer being selected from the group comprising: polyacrylamide, hydrolyzed polyacrylonitrile, polyvinyl alcohol, organosilicon liquid, latex and cationic bitumen emulsion, and said hardening accelerator being alkali or alkali-earth metal sulfates or chlorides. |
 Composition for improving of reservoir recovery / 2246605Claimed composition contains (mass parts): resin 100; liquid curing agent (e.g., alkali solutions) 15.1-60; ammonium carbonate 0.1-9.9. Composition of present invention afford the ability to limit the water and sand inflow, to increase strength and permeability of formed reservoir. |
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Method of insulating formation water inflow / 2244115 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. |
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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. |
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Hydrophobic agent for treatment on bottom area of formation / 2244818 Bottom area of formation is treated with hydrophobic agent, in particular solution of ethylene/vinyl acetate copolymer expressed by general formula [-CH2-CH2-C(CH3COO)H-CH2-]n, where n=7000-10000, in hydrocarbon solvent. |
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Composition for confinement of water inflow into well / 2244819 Composition is made up of 90.0-95.0% sodium silicate solution with concentration 1.36 g/cm3 and silica modulus 3.0, 3.0-8.0% alkali metal silicofluoride, 1.0-4.0% wood flour, and 1.0-4.0% triacetine. Composition can be used during repair operations on oil production stings, when disabling formations, and when confining water inflow. |
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Method for blocking high-penetrable watered oil beds / 2244820 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. |
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Method for blocking high-penetrable watered oil beds / 2244821 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. |
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Method for blocking high-penetrable watered oil beds / 2244822 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 |
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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. |
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Compound for water isolation of low-temperature beds / 2250367 Compound has carbomide, urotropine and water, additionally has chlorine iron with following relation of components in percents of mass: carbomide 6.0-16, urotropine 5.0-8.0, chlorine iron 5.0-10, water the rest. |
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
The invention relates to the construction of oil and gas wells, in particular to the isolation of permeable formations, as in drilling and overhaul. There is a method of isolation of the permeable formation comprising pumping into the well plugging material based on acrylic polymers and their derivatives [1]. These water-soluble polymers used in water compositions in combination with electrolytes, forming or precipitation (gels)or viscoelastic seal weight, stable in the environment of saline and fresh water. However, the method has drawbacks. "custom made" the polymer in the process of leveling in the insulated layer passes through the pores streams and takes shape in the cross section, which further does not cause resistance to the interaction of water sources nearby reservoirs. In addition, this method consistently pumped electrolyte, the polymer was then and again the electrolyte. When uneven porosity and permeability of rocks these components are not always fully involved in the reaction. Therefore, the output of the insulation material are low. Hence low efficiency and insulation works. The closest technical solution chosen by the authors for the prototype is the way to isolate the permeable formation in a well comprising pumping portion swollen acrylic polymer AK-639, extract it in the well and the injection of the second portion of the same polymer. This method has the following disadvantages. When isolation of permeable layers of high-power and high pickup swollen polymer even when the concentration of the polymer of 20% goes into the depth of the reservoir and does not isolate the major channels in fractured and porous reservoirs The objective of the invention is improving the efficiency and insulation works by providing fill fractured rocks, large canals in them grouting composition, limiting deep penetration swollen polymer in permeable reservoir rock. The problem is solved due to the fact that the method of isolation of the permeable formation in a well comprising pumping portion swollen acrylic polymer AK-639, extract it in the well and the injection of the second portion of the same polymer, before and after injection of the first portion of the swollen polymer shut on fresh water with a concentration of 1-20%, is pumped buffer of fresh water, and before and after injection of the second portion swollen polymer shut on a hydrocarbon liquid with a concentration of 10-20%, they fill the buffer from the hydrocarbon liquid, additionally, the well pumped mentioned 2 portions of the system repeatedly. Essentially with this method the problem is solved due to the following additional mechanism for the formation. Swollen polymer shut hydrocarbon liquid, inert. Therefore, it penetrates into large cracks, simultaneously plugging the inlet of small channels. In large channels swollen polymer at some distance from the wells is mixed with fresh water. The polymer swells and covers a large channel, because it uses all its ability to swell in 100%. While the injection of swollen polymer shut on fresh water, he at the approach to the insulated interval loses up to 50% of its capacity to swell. Example of commercial application of the method: For carrying out insulation work in a well drained column tubing (tubing) to the roof of the insulated layer. The layer presents srednetsenovoj breed. For isolation of the reservoir in the casing at the closed annulus is pumped buffer of fresh water and is determined by the injectivity of the well. Then closes the first portion of the swollen polymer in fresh water and pumped into the well. After that pumped buffer of fresh water. The second portion of the swollen polymer is prepared in the following sequence: injection buffer of the hydrocarbon fluid, the swollen polymer, shut hydrocarbon fluid, a buffer from the hydrocarbon liquid. In this sequence in the well may be pumped several 2 portions of insulation systems, if you have to isolate the reservoir, presents krupnosemyannye rocks. In addition, when the insulation layers with high permeability, for example, more than 40 m 3 /h at a pressure at the wellhead of the order of 60-80 kg/cm2 concentration of swollen polymer in the oil increases due to the reduction of oil viscosity. For this purpose the oil is pre-injected surfactants, such as the brand "Neonol" 6 m 3 oil 9 l PAVA. The proposed method differs from the known, which limited the effectiveness of the application in insulation works in permeable rocks, represented by large cracks or channels. The advantage of the proposed method over the known is to ensure wide use of it in almost all ranges of permeabilities of rocks, as in the isolation of fractured carbonate rocks, and terrigenous. The method is equally applicable in cased and uncased wells. Known technologically-not suitable for use with the elimination of water flows between reservoirs with different formation pressure, because the grouting mixture razbavlyali will be replaced, whereas the proposed method eliminates this process. A portion of the swollen polymer shut on hydrocarbon liquids when in contact with water will actively respond and due to the rapid structure formation to create a jumper with high bridging properties. 1. The method of isolation of the permeable formation in a well comprising pumping portion swollen acrylic polymer AK-639, extract it in the well and the injection of the second portion of the same polymer, characterized in that before and after injection of the first portion of the swollen polymer shut on fresh water with a concentration of 1-20% of the injected buffer of fresh water, and before and after injection of the second portion swollen polymer shut on a hydrocarbon liquid with a concentration of 10-20%, they fill the buffer from the hydrocarbon liquid. 2. The method of isolation of permeable formations in a borehole according to claim 1, characterized in that the well pump 2-batch system repeatedly.