Procedure for insulation of water inflowing pay in well and heat insulating pipe for its implementation

FIELD: gas and oil production.

SUBSTANCE: procedure consists in lowering string into well into zone of water inflowing pay, in pumping backfilling solution prepared of bitumen with filler through string into well and in forcing string through into water inflowing pay. Also, as filler there is used cement and additionally high viscous bitumen at amount of 5-20 wt % or high viscous oil of volume of bitumen-cement solution determined depending on a geologic-physical characteristic of the pay. Before pumping into the well and depending on occurrence depth of the water inflowing pay backfilling solution is heated to temperature as high, as 70-80°C. Solution is pumped through the string of heat insulated pipes under the mode of alternating pressure at maximal pressure not exceeding pressure of hydraulic outbreak above the located pay. Also, after water insulating operations production of the pay is withdrawn in a cyclic mode with start up into operation for 2-3 days and shut down for the same time as many as three times, if intake capacity of the pay exceeds 500 m3/day.

EFFECT: improvement of procedure.

5 cl, 1 dwg

 

The invention relates to the oil industry, and in particular to methods isolation of inflow of water into an oil well from the aquifer and high-permeability reservoirs, mainly with criminalactivity and cavernous reservoirs, as well as to regulate the profile of the injection well.

There is a method of isolation of inflow of water into an oil well (see USSR author's certificate No. 661102, EV 33/13, 1974, "a Method for isolating the flow of formation waters and A.S. No. 1694855, EV 33/13, 1990, "Method for isolation of inflow of water into an oil well"), which consists in injecting into the reservoir oil, containing in its composition of resins and asphaltenes, and sulfuric acid with the purpose of receiving on the basis of insulating material in the form of acid tar formation conditions. As is known, the quantity and quality of the obtained acidic tar depends on the content in oil asphalt-resinous substances. When the decrease in oil these substances reaction sulfanilamide slows coagulation products of asphaltenes and condensation resins are characterized by low dynamic viscosity of the mixture is allocated a substantial liquid phase. All these factors contribute to an opposite exit from a reservoir formed in the layer of insulating material. Hence the need for injection of a large number of insulating m the material and re-insulation works, that, in turn, leads to increased material costs.

There is also known a method for blocking aquifer and high-permeability layers, see patent No. 2186938 EV 33/138, publ. in BI No. 22, 10.08.2002, whose description is given and the method of its implementation. The method involves the descent of the tubing in the borehole in the zone vodopriemnogo reservoir and pumping through it into the well cement slurry of bitumen with filler and punching him in vodoprivredi layer. In the filler used xerogel with a mass fraction comprising 2-8%.

The disadvantage of this method is that in the process of placing the cement slurry in the column pipe there is a risk of premature thickening due to cooling and as a result of its penetrating power far into the formation is sharply reduced. Hence the low quality insulation works, short duration of effect isolation of water. In addition, the use of the xerogel in the composition of the cement mixture is uneconomical due to the high cost.

Known insulated column for discharge of the coolant in the reservoir (see A.S. No. 740932, EV 36/00,1980), contains an inner pipe with coupler and sliding transferable sleeves and insulating ridges and the outer pipe, which is placed between the shielding and heat-insulating material and about asvany closed air cells.

The disadvantage of insulated columns are high heat losses during injection of the coolant into the reservoir associated with the fact that in the annular space of the column heat conductive material is air having a relatively high thermal conductivity. Furthermore, the design of the column does not preclude the penetration of fluid into the tube space of the columns in its operation and deterioration of insulating properties.

Closest to the proposed insulated pipe to the technical essence is insulated column (see patent RU NO. 2129202, EV 17/00, 36/00, 1999), which includes an inner tube located therein multilayer screen insulation, outer tube, made of the same material as the inner, cone-resistant threaded at the ends and screw on one end coupling with the sealing sleeve, the ends of the pipe with water and vacuum-tight joints, in the annular space created by the vacuum 10-3-10-4mm Hg

The disadvantages of the prototype are relatively high heat loss during pumping her carrier associated with imperfect vacuum in the annular space and because of this relatively high thermal conductivity of the remaining air. In addition, insufficient durability of insulated columns, include the Naya corrosion of the inner surface, especially at high temperature during the injection of coolant, as well as associated with the wear of the threaded connections in the process of screwing-unscrewing them during tripping operations on the well.

The technical objective of the proposed method is to increase the efficiency of the waterproofing works, reducing water production wells, as well as increased oil recovery and reduction in material costs due to the use in the composition of the cement mixture more available and cheap materials. The technical task is the creation of insulated pipes with high efficiency and durability by reducing corrosion of the inner surface of the pipe and reduce wear of the threaded connections.

The problem is solved by the described method, including the descent into the well in the zone vodopriemnogo reservoir column of pipes and pumping through it into the well cement slurry made of bitumen with filler and punching him in vodoprivredi layer.

What is new is that, in the use as a filler cement and in addition enter this highly oxidised bitumen in the amount of 5-20 wt.% or high-viscosity oil volume bituminite solution is determined depending on the geological characteristics of the reservoir before pumping ol is prepared cement slurry into the well, depending on depth vodopriemnogo layer it is heated to a temperature of 70-80°C, and pumping lead the convoy insulated pipe mode alternating pressure at maximum pressure not exceeding the pressure of the fracturing of the upstream reservoir, in the initial stage of operation well after waterproofing works selection of products formation are in cyclic mode, start in 2-3 days and stop at the same time and not less than three times, if the response of the aquifer was more than 500 m3/day, and before waterproofing works well first investigated in the pickup vodopriemnogo layer, on the presence in the composition of formation water of hydrogen sulfide and its concentration in it, and also determine the thickness and pressure vodopriemnogo layer.

Another difference is that while waterproofing works injection wells that have on the production well hydrodynamic effects, or disable this work combine with stops these injection wells under cyclic flooding reservoirs, and in the surrounding water-saturated producing wells selection of product formation increases.

The difference is that before pumping cement slurry into the well initially produced water pushed into the formation of the buffer fluid with the addition of the filler with water-repellent effect is based 1-2 to the 1 m 3the buffer liquid, and use as a filler talc or carbon black or modified dispersed silica, and as a buffer fluid use preheated to a temperature of 80°C water with the addition of water-soluble surface-active substances (surfactants).

Insulated pipe for implementing the method includes an inner tube located therein multilayer screen insulation, outer tube, made of the same material as the inner, cone-resistant threaded at the ends and screw on one end coupling with the sealing sleeve, the ends of the pipe with water and vacuum-tight joints, in the annular space created by the vacuum.

What's new is that on the other end of the outer pipe nevernot sub with a sealing sleeve made, as coupling of high-strength steel, at the free ends of the sub and the clutch cone-resistant thread is made with a large step in the annular space created by the vacuum 10-8-10-10mm Hg, on the inner surface of the inner pipe caused silicate-enamel finish.

Patent research retrospectivity 20 years was carried out in the patent library TatNIPIneft to determine the technical level and preliminary examination of novelty. The patent studies have shown the, what objects similar purpose with this set of essential features, as claimed, is not detected, therefore, we can assume that he has novelty, and its practical applicability is confirmed by the description of the method and experimental field trials.

In the present drawing shows a heat-insulated pipe for the implementation of the proposed method in partial longitudinal section.

Insulated pipe includes an inner pipe 1 and outer pipe 2 with cone-resistant thread 3 on the ends, provided with a valve 4. The inner and outer tube are made of the same material and on the ends with water and vacuum-tight joints 5. On the inner pipe 1 multi-layered insulation screen, consisting of layers of glass grid 6, aluminum foil 7 and placed between layers of a multilayer display isolation sorbent 8. Multilayer insulation screen is held centering rings 9. In the annular space 10 created a vacuum of 10-8-10-10mm Hg Sleeve 11 made of high strength steel with sealing sleeve 12, screw on one end of the outer pipe 2. At the free end of the coupling 11 is made cone-resistant thread 13 in greater increments than cone-resistant thread 3. Sub 14, made of high-strength steel, with Oplotnica the Noah sleeve 12 nevernot on the other end of the outer pipe 2. At the free end of the bottom sub 14 is cone-resistant thread 15 in larger increments than cone-resistant thread 3. On the inner surface of the inner tube 1 is caused to silicate-enamel coating 16.

Application svininih in column insulated pipes can reduce heat loss by injecting fluid into the formation, the rise of production from wells and other technological operations by reducing thermal conductivity of the pipes and their connections, to improve the durability of the pipes due to menshenina wear of the threads when screwing-unscrewing threaded connections during tripping operations and reduce corrosion of the inner surface of the pipe, and will also prevent the deposition of wax on the inner walls of the pipe. The method is carried out in the following sequence. First, in conjunction with the geological survey are conducting research to determine the interval vodopriemnogo layer and its permeability, reservoir pressure and composition of the formation water in the presence of dissolved hydrogen sulfide (H2S) and its concentration in the water, without taking into account which is not ensured high quality waterproofing works. This is because hydrogen has a damaging effect on the hydration process of cement (in the proposed method of grouting mortar is resultsthe cement), educated cement stone becomes loose and not strong enough. Next, injection wells, affecting production well hydrodynamic effects, or disable this work combine with stops these injection wells under cyclic flooding reservoirs, and in the surrounding water-saturated producing wells selection of product formation increases to increase the speed of advancement of waterproofing material into the formation. Then well go down the column of heat-insulated pipes above structures under bottom hole of the filter and the wellhead is equipped wellhead valves and after checking the reliability of the connections tying the mouth of the well is washed by the establishment of direct or reverse circulation of fluid to clean the bottom-hole zone (PPP) at the open gates overlying the injection line and the line connecting the annulus. At the end of this operation the valve to the line connecting the turns, close and start the operation of forcing the reservoir water into the formation by pumping a buffer fluid, heated to 80°C with the addition of the filler with water-repellent effect of the calculation of 1-2 kg per 1 m3the buffer fluid. At the same time as the buffer fluid use technical water with the addition of water-soluble PAVA,which can be used polymers of the acrylic acid series (PAA on THE 6-16-2531-81, THE 6-01-1049-81 and others), and as a water-repellent filler use talc or carbon black or modified disperse the silica in the range from 0.01 to 0.03 wt.% particle size of 0.1-100 μm. In addition, in case of detection in the formation water of dissolved hydrogen sulfide in it additionally adds chem. reagent for neutralization, for example, manganese dioxide (Mno2), at the rate of 0.5-1 kg per 1 m3the buffer fluid depending on the concentration of H2S. the Buffer liquid is prepared from the calculation of 2-5 m31 meter thickness podozrevaemogo layer depending on his pickup.

Then, without stopping the process, followed by a buffer fluid pumped prepared bicamerality solution with added extras this highly oxidised bitumen in the amount of 5-20 wt.% or high-viscosity oil volume bituminite solution. The total volume of cement slurry take into account the geological and physical characteristics of the reservoir, which may vary within wide limits, and its density is picked up by known methods, for each well separately with regard to the setting of cement slurry and the pressure in the aquifer.

Preparation of cement slurry from the aforementioned composition exercise zatvoreniem cement on the bitumen through the mixing machine (SMS) by pumping the solution is of canka cementing unit (CA-320). As bitumen can be used bitumen Mordovo-Karelskogo field containing 9-12% water. In the process of pumping bituminite solution in Chanak enter this highly oxidised bitumen in the amount of 5-20 wt.% or high-viscosity oil volume bituminite solution. At the same time as this highly oxidised bitumen can be used bitumen oil fragile GOST I-87. Prepared with cement slurry before injection into the well is heated to a temperature of 70-80°C depending on the depth of the waterproofing layer (the deeper the well, the temperature is higher). Heating of the cement slurry perform one way, for example, using a heat exchanger type "pipe in pipe". When pumping cement slurry reducing its temperature minimum, because this is facilitated by pumping it through a heat-insulated casing pipe, pre-heated in the process of injection buffer fluid with a temperature of 80°C in the reservoir to push the reservoir water into the formation. After pumping cement slurry into the well using CA-320 push it into the reservoir and squeezing the liquid, which can be used for process water. The operation of punching shear are in the mode of alternating pressure, maximum pressure, not reviewsel pressure fracturing of the upstream reservoir, that provide uniform distribution therein cement slurry, its penetration in hard-to-reach cracks and pores and into the formation. After completion of the operation of forcing the well left alone for 24 hours at the time of solidification and structure of cement slurry to form a watertight fixed and durable screen.

Next, the well is completed and continue to operate it. In the process of completion of the selection of product formation is desirable to maintain in the cyclic mode, for example, 2-3 days selection and the same time stop, but not less than three cycles, if the response of the aquifer was more than 500 m3/day, which achieves a similar effect as described above under cyclic burst into the layer of cement slurry. Under the effect of reservoir pressure from injection wells having a hydrodynamic connection with mining, there is a reallocation of water-repellent and waterproofing material, the seal created waterproofing of the screen will lead to penetration and filling of cracks and pores of the insulating material.

Technical and economic advantage of the invention is as follows.

The method provides reliable waterproofing of the screen without using expensive the present materials, can dramatically reduce the water content of produced reservoir to increase oil recovery. On the date of application the method is tested on dozens of wells Romashkinskoye oil field oil and gas Leninogorskneft", the results are positive. The widespread use of the method will provide tangible economic benefits.

1. The method of isolation vodopriemnogo formation in the well, including the descent into the well in the zone vodopriemnogo reservoir column of pipes and pumping through it into the well cement slurry made of bitumen with filler and punching him in vodoprivredi layer, characterized in that the filler used cement and in addition enter this highly oxidised bitumen in the amount of 5-20 wt.% or high-viscosity oil volume bituminite solution is determined depending on the geological characteristics of the reservoir, before injection into the well prepared cement slurry into the well, depending on depth vodopriemnogo layer, it is heated to a temperature of 70-80°C, and pumping his conduct on the column of heat-insulated pipes in the mode alternating pressure at maximum pressure not exceeding the pressure of the fracturing above the reservoir, while in the process of completion after waterproofing work shall tbor product formation are in cyclic mode, start in 2-3 days and stop at the same time and not less than three times, if the response of the aquifer was more than 500 m3/day.

2. The method according to claim 1, characterized in that the hole first investigated in the pickup vodopriemnogo layer, on the presence in the composition of formation water of hydrogen sulfide and its concentration in it, and also determine the thickness and pressure vodopriemnogo layer.

3. The method according to claim 1, characterized in that the waterproofing works injection wells that have on the production well hydrodynamic effect, disable, or this work combine with stops these injection wells under cyclic flooding reservoirs, and in the surrounding water-saturated producing wells selection of product formation increases.

4. The method according to claim 1, characterized in that prior to pumping cement mixture into the well initially produced water pushed inland reservoir buffer fluid with the addition of the filler with water-repellent effect of the calculation of 1-2 kg per 1 m3the buffer fluid.

5. The method according to claim 4, characterized in that the filler used talc, or soot, or modified dispersed silica, and as a buffer fluid use preheated to a temperature of 80°C water with the addition of water-soluble surface-active substances (surfactants).



 

Same patents:

FIELD: oil and gas production.

SUBSTANCE: procedure for restraint of water production in well consists in pumping solution of CL (cultural liquid) into insulated interval. Two equal portions are pumped. The first portion corresponds to solution of CL prepared on soft water of 1000 kg/m3 density at ratio 1:0.5-1, while the second one corresponds to solution prepared on reservoir mineralised water of density up to 1190 kg/m3 at ratio 1:0.3-0.5.

EFFECT: raised efficiency of repair-insulation operations due to creation of more resistant to water outbreak screen of water solutions of silicon-organic liquid - CL with controlled period of gelation excluding their preliminary hardening.

3 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure consists in simultaneous effecting permeable walls of well borehole with scrapers for removal of filtration crust and with high-pressure jets generated from hydro-monitored heads of mud injector during well bottom hole deepening with drilling. Also, hydro-jets are directed at angle towards each other, they converge at one point on the wall of the well and destroy their nuclei, thus preventing destruction of walls of the well and formation of cavities. Well walls are subjected to the similar effect when the well is treated before lowering a producer for cementing. Drill agent containing dispersed solid particles is used as fluid for high-pressure hydraulic jets.

EFFECT: raised efficiency of mud fill, reduced expenditures for emergency-recovery operations and time for construction of well.

2 cl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: composition contains carbamide-formaldehyde resin, acid hardener and filler. As hardener there is used resorcin and ferro-chrome-lignosulphonate, and as filler there is used carbon white CW-120 or talk, or rubber powder, or chalk at the following ratio of components, in weight shares: carbamide-formaldehyde resin 100; resorcin 7-15, ferro-chrome-lignosulphonate - FCLS-M 1.5-25, filler 3-8.

EFFECT: reduced water loss of backfilling solution and increased strength and adhesion characteristics of cured composition.

2 cl, 1 tbl, 20 ex

FIELD: oil and gas production.

SUBSTANCE: composition includes phenol-formaldehyde resin of resol type, curing agent and mineral or organic filler. Additionally composition contains an activating agent of the process - resorcin and expanding additive EA-100. As ageing agent there is used ferro-chrom-lignosulphonate FCLS-M and additionally expanding additive of type AE-100 at the following ratio of components, wt shares: phenol-formaldehyde resin PFR-3027B 100; ferro-chrom-lignosulphate FCLS-M 1.0-10; resorcin 1.5-10; filler (carbon white CW-120 or talk, or rubber powder, or chalk or barite) 4-8; expanding additive EA 5-15.

EFFECT: reduced water loss of backfilling solution and increased strength and adhesion characteristics of cured composition.

2 cl, 3 tbl, 11 ex

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

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 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.

SUBSTANCE: borehole sinking, lowering and attachment of casing and production strings is performed. The first part of the well bore - direction is drilled with diametre of not more than 300 mm by using clay drilling solution with density of 1.12-1.20 kg/m3, the second part - conductor is drilled with diametre of not more than 220 mm, and the third main part is drilled with diametre of not more than 160 mm. As drilling solution, when drilling the conductor and the third part, there used is service water with density of 1.00-1.09 kg/m3. Flow rate of service water is determined with lost circulation zones exceeding the service water absorption. After the caving zone is opened and the bottomhole is deepened below the caving zone by 10-15 m, the well bore is washed with service water in the volume of 1-2 of the well volume, layout with the bit is lifted, layout with open end is lowered below caving zone, washing is performed for 1.5-2.5 hours with water for caverns to be formed in he caving zone, layout is lifted above the caving zone by 10-30 m, process exposure is performed during 0.5-1 hour for the soil to fall from caverns, layout is lowered and the caving value is determined as per the varying depth of the bottom-hole. In case of caving the end of pipes reaches the bottom-hole with washing. Layout is lowered and the caving interval is filled in the following way: clay solution is pumped with density of 1.12-1.25 kg/m3 in volume of 1 to 5 m3, fresh flush fluid to cut the clay solution from cement solution in volume of 0.5-1 m3, cement solution with addition of 1 - 3% setting calcium chloride agent in the volume equal to 1.1-1.3 of the design one to shutoff the caving zone. Flushing with service water is performed. Layout is lifted from the well, process exposure is performed for waiting on cement during 4-6 hours, drilling assembly by means of which the well bore has been drilled is lowered, cement bridge is drilled within the interval of the caving zone and the well drilling is continued to the design depth. When cement solution is being pumped, tubes are rotated with rotation frequency of 10 to 60 rpm, and when cement solution is flushed with water, reciprocation of pipe string is performed by the value of 8-12 m with frequency of 1 to 4 lifts per minute.

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

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 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

Plugging mix // 2245989

FIELD: oil and gas production.

SUBSTANCE: plugging 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.

EFFECT: reduced filtration and shrinkage of plugging mortar.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: improved properties, reduced shrinkage deformations, and under conditions resistance to fissuring.

2 cl, 2 tbl

FIELD: mining engineering, in particular improving of reservoir recovery.

SUBSTANCE: claimed 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.

EFFECT: improved reservoir recovery, increased turnaround time, reduced underground equipment in well.

2 tbl, 4 ex, 2 cl

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