Method for near well-bore treatment with acid. RU patent 2490444.
 Procedure for treatment of bottomhole zone of producer with two wellheads / 2490443In procedure for treatment of bottomhole zone with two wellheads in case of failure of an electric-centrifugal pump (ECP) with no apparent deviation in its operating parameters and in case of alkalinity growth for extracted product up to pH>7 the required volume of hydrogen chloride solution is calculated on the basis of a length and diameter of the well filtering part; the required volume of hydrogen chloride solution is selected to treat the whole volume of the strainer; the required volume of flush fluid is calculated for delivery of compounds into a slope wellhead. ECP is shutdown at the vertical wellhead before pumping of hydrogen chloride solution is started. The required volume of hydrogen chloride solution is carried out into tubular annulus from the side of the vertical wellhead. When pumping of hydrogen chloride solution is over extraction from the slope wellhead is increased and ECP is started from the vertical wellhead. ECP is stopped at the vertical wellhead and hydrogen chloride solution is overflushed by the flush fluid into filtering part of the well. After ECP startup in enlarged extraction rate from the slope wellhead samples are taken periodically in order to check pH value, monitor dynamics in changes of fluid supply from the slope wellhead. When pH value id recovered up to the normal value ECP is started into operation from the vertical wellhead and supply from the slope wellhead is returned back to normal operation mode. |
| Method for well completion / 2490442 In method for well completion including pumping of acid solution into open horizontal hole in the mode of jet impact such impact is attained due to a jet delivery by a jet nozzle at the end of a flexible flush-joint pipe. The nozzle is placed at the borehole bottom. The acid solution is pumped with circulation through the well mouth; while acid solution is circulating the flexible flush-joint pipe is lifted simultaneously from the well with the speed not exceeding speed of the borehole filling by the acid solution. When horizontal hole is filled with the acid solution, the solution is overflushed into the stratum with staged pressure build-up and exposure at each stage. The flexible flush-joint pipe with a nozzle is placed again at the borehole bottom and the operation of borehole filling and overflushing is repeated again. Soaking takes place so that acid solution could react with the rock. The flexible flush-joint pipe is lifted to the interval of inert gas pumping, an inert gas is pumped and a build-up curve is recorded. Cyclic well killing is carried out in the mode of water pumping - soaking - oil draining till complete oil drain; thereafter a submerged pump is run-in and the well is input into operation. |
 Device for treatment of bottomhole formation zone of a well and method for treatment of bottomhole formation zone of well / 2487237Device for treatment of bottomwhole formation zone contains an air chamber with atmosphere pressure and length of 20-50 m connected to the first additional perforated chamber with seal layer, solid heat generating compound A with flame igniter, combustible high-strength compound B and breakable calibrated membrane located inside; the first added perforated chamber by means of a coupling with holes is connected to the second added inlet chamber with combustible high-strength compound C, igniter and breakable calibrated membrane located inside; the second additional perforated chamber by means of a coupling with added air chamber with length of 1.5-3 m connected by means of a coupling and metal adapter with to inlet chamber that is made of elastic plastic material with seal layer, solid acid generating compound D with igniter located inside; in the metal adapter there are drilled holes; compound A generated heat and gas of the following components by wt %: ammonium nitrate 35; sodium bichromate 2; barium nitrate 15; aluminium ASD-1 1.5; iron-aluminium thermite 31; epoxide compound (mixture of ED-20 tar, EDOS plasticiser and AF-2M hardener) 15.5; compound B is made of the following components by wt %: ammonium nitrate 30-40, calcium carbonate 5-10, the above epoxide compound 50-65; inside the added inlet chamber there is a layer of glass sealant and solid gas generating compound E made of the following compounds by wt %: ammonium nitrate 70, sodium bichromate 1, the above epoxide compound 29; compound C is made of the same composition as compound B; compound D is made as thermal-gas-chemical solid fuel with a layer of glass sealant and a layer of epoxide compound on top of it; the above fuel consists of the following components by wt %: ammonium nitrate 12-16, lithium fluoride 1-3, barium nitrate 5-8, aluminium ASD-1 0.7-0.8, iron-aluminium thermite 14-16, hexachlorane 20-30, polytetrafluoroethylene 20-30, the above epoxide compound 5-10. The method for treatment of bottomhole zone (BHZ) includes delivery of the above device by a wireline, combustion of compound D and formation of maximum quantity of chemical agents, holding for the purpose of reaction of acids produced during combustion with BHZ formation, running with installation of the coupling with holes at the level of treated stratum, opening of the chamber with length of 20-50 m, actuation of breakable calibrated membrane in result of layer-by-layer combustion of compounds A and B with implosion treatment of BHZ, removal of impurities from bottomhole stratum; during holding thermal-gas-chemical impact acts on the stratum for 30 minutes ad pressure can be corrected due to availability of holes in the metal adapter at fixed position of the above fuel inside the inlet chamber due to the above layers of sealant and compound with formation of gases heated up to high temperatures at high pressure within treatment range; opening of the chamber with length of 1.5-3 m is carried out by sequential actuation of the igniter, compounds E and C and breakable calibrated membrane located in the second added inlet chamber; after hydraulic shock there's another holding of the process for 30 minutes; when the chamber with length of 20-50 m is opened combustion of compound A takes place with formation of gases heated up to high temperature at high pressure within treatment range. |
 Stimulation method of formation fluid influx from well / 2485305Stimulation method of formation fluid influx from the well consists in lowering to the well of a tubing string. Counter pressure on the productive formation is decreased owing to replacing the liquid column with liquid-gas mixture (LGM) at observance of the required value of depression on the productive formation. Before the tubing string is lowered, its lower end is equipped with a remote subsurface pressure gauge and a filter. The tubing string is lowered to the well so that the filter is located opposite the formation perforation interval; after that, treatment of the bottom-hole zone of the formation is performed using a chemical method with process exposure for reaction. Then, the tubing string is lowered further so that the filter is located below the formation bottom, and into the inter-string space there lowered is a string of flexible tubes (FT) 100 m below the liquid level in the well. The liquid column is replaced in the inter-string space of the well with LGW and lowering of the FT string is continued. When lower end of the filter of the tubing string is reached, lowering of the FT string is stopped; then, stimulation of the formation fluid influx is started by gradual reduction of density of pumped LGM till the required depression on the productive formation, which is controlled as per readings of the remote subsurface pressure gauge, is achieved. After completion of stimulation of the influx from the well there removed is FT string from the inter-string space of the well, and operating equipment is lowered to the well and the well is put into operation. |
| Method for reagent clay cake removal from well / 2484244 Method for reagent clay cake removal from a well involves preliminary lowering of the tubing to lower perforation holes, formation in the zone of perforation holes of the first bath by pumping to the well via the tubing of a clay cake removing solution, its exposure, removal, further formation in the same zone of the second bath of water solution of acid with its being forced through the perforation zone to the formation and removal of the second bath by flushing; development of the well. As the clay cake removing solution, water solution of caustic soda with addition of surface active substance (SAS) is used. When the tubing is being lowered to the ell, it is equipped with a packer. Then, at open casing valve there performed is formation of the first bath by pumping of the above water solution of caustic soda via the tubing string, and the specified water solution of caustic soda is delivered to the formation by its being forced with process liquid via the tubing. Them the packer is set at the depth of not less than 50 metres above the treated formation, and forcing of water solution of caustic soda is performed with process liquid to the formation without exceeding allowable pressure on the formation; then, the well is kept for 10 hours for reaction under pressure not exceeding allowable pressure on the formation. Then, the packer is unpacked, and the working face is flushed by reverse flushing with process water by additional lowering of the tubing to the distance of 1-1.5 metres till the working face. Then, the packer is lifted so that it can be located at the depth of not less than 50 metres above the formation. Then, in the same zone there formed is the second bath by pumping of clay-acid solution with addition of Katapin KI-1 reagent on the basis of the fact that volume of clay-acid solution shall be 0.5-1 m3 per metre of the formation. The above clay-acid solution is forced with process fluid via the tubing to the formation; then, the packer is set and forcing of clay-acid solution is performed with process fluid to the formation without exceeding allowable pressure on the formation. Reaction exposure is performed during 1-2 hours. Then, well swabbing is performed via the tubing in the volume of 1.5-2 of the well volume. Then, the well injection capacity is determined at the pressure not exceeding maximum allowable pressure on the formation. When the required well injection capacity is not achieved, the above operations are repeated maximum for three times till the required well injection capacity is achieved. |
| Method for increasing oil recovery of deposit in carbonate reservoirs of fracture-pore type / 2482269 Method for increasing oil recovery of the deposit in carbonate reservoirs of fracture-pore type involves formation of a group of production wells with an injection well in the centre so that the injection well can be located in the lower part of the deposit structure in relation to production wells, oil recovery from the group of wells watered out with bottom water, forced extraction of fluid from the injection well till the response of the neighbouring wells to that action and reduction of formation pressure in the area of responding production wells. After steady reduction of formation pressure in the area of responding production wells by more than 10 %, each of them is pumped with waterproof compound that is strengthened under action of chlorhydric acid in the volume of 15-20 m3. After waterproof compound is cured, forced extraction of the fluid is stopped and acid bearing compound in the volume of 0.4-1.0 m3 per metre of oil saturated part of the formation is pumped to each well treated with waterproof compound. Responding production wells are brought into operation. |
| Method for bottom-hole zone treatment / 2477787 Method for formation bottom-hole area treatment includes mounting of oil-well tubing in the well below perforation holes, determination of technical condition of production string and character of production formation saturation in perforation zone on the base of geological-geophysical researches data, pumping and squeezing down to the formation water solution of alkali metal supersalt with holding for reaction for 10-12 h, extraction of reaction products from bottom-hole area by well blowing by inert gas or gas from well-donor through casing annulus, pumping and squeezing down to the formation hydrogen chloride, holding for reaction for 6-8 h, well development by gas from well-donor or inert gas. |
 Acidic aqueous solution containing chelating agent and use thereof / 2476475Invention relates to an acidic aqueous solution containing a chelating agent and an acid, wherein the chelating agent is glutamic N,N-diacetic acid (GLDA) or a salt thereof and wherein the amount of GLDA or the salt thereof is 20-60 wt %, based on the weight of the aqueous solution, and wherein the acid is selected from hydrochloric acid, hydrobromic acid, hydrofluoric acid, hydroiodic acid, sulphuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, citric acid, lactic acid, malic acid, tartaric acid, maleic acid, boric acid, hydrogen sulphide or a mixture of two or more of these acids, and use of said solution in cleaning processes, precipitation processes or processes of removing salt deposits, at oil fields in completion and stimulation by acid treatment, fracturing and/or deposit removal. The acidic aqueous solution has pH below 3. |
 Development method of bottom-hole zone of terrigenous oil formation / 2475638According to the method of development of bottom-hole zone of terrigenous oil formation, before pumping of acid solution well is killed by solution of alkali metal hydroxide adding potassium and/or natrium chloride in quantity 0-35 wt % to obtain optimum density of composition, then well is pumped with aqueous solution containing 4-8 wt % of chlorhydric acid and 0.5-1.5 wt % of fluorhydric acid adding versene (trilon "B") in quantity 0.01-0.5 wt %, sodium dodecylsulfate in quantity 0.01-0.1 wt %, then aqueous solution of oil wetting agent NG-1 with concentration 0.01-2 wt % is pumped into formation. |
| Method of well bore zone treatment of production well / 2473800 Method of well bore zone treatment of production well involves determination of material composition of formation rock in the treated zone by means of carbon-oxygen logging (COL) immediately after the well drilling, at the following formation rock component ratio: quartz - not more than 50 wt %, clay - more than 10 wt %, and content of a layer of bitumen-resin-paraffin substances in oil of more than 30 wt %, and temperature in the well bore zone of 80-100°C; as treatment agent, Khimeko TK-3 acid composition diluted with hydrochloric acid (3%) is used in the ratio with the latter of 1:(2÷4) by weight respectively. |
| Method of treating bottom zone of low-permeable oil reservoirs / 2244111 Invention aims at increasing productivity of oil- and gas-producing and injecting wells exposing high-temperature low-permeable oil reservoirs. In the treatment method according to invention including forcing enzyme substrate and separate enzyme into formation and creating conditions to enzymatically convert substrate into acid, geologic and productive characteristics for each interval of bottom zone are determined in order to pick out low-permeable intervals of oil reservoir for treatment, whereupon properties of enzyme substrate and separate enzyme as well as conditions for their pumping are chosen. Substrate utilized in the method is head fraction of methyl- and/or ethyl-, and/or butyl acetate production, to which aliphatic alcohols are added, and enzyme is an acid solution. Substrate is pumped simultaneously and/or before, and/or after pumping of enzyme, after which well is closed for some time and then opened and placed under predetermined operational conditions. |
 Device for treating well walls within range of productive bed / 2244112Device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve. |
 Composition for treating bottom zones of wells / 2244114Invention relates to compositions used for intensifying wells owing to increasing permeability of rocks forming well bottom zones. Composition of invention contains 7.0 to 30.0% ethanol, 0.1 to 0.3% cupric chloride, 0.1 to 0.5% alkylbenzenesulfonate, and trichloroacetic acid (to 100%). |
 Acid composition for treating terrigenous oil reservoirs and a method for acid treatment of bottom area of formation / 2244816Invention provides composition that can be used to intensify oil inflow and to develop well by means of acid treatment of terrigenous oil reservoir as well as to intensify oil inflow and to increase oil recovery of formations with the aid of hydraulic rupture of formation assisted by acid solutions. Composition contains borohydrofluoric acid needed to create borosilicate films prohibiting migration of particles during acid treatment. In addition, composition is characterized by lowered rate of reaction with rock at formation temperature in order to extend coverage of formation by treatment and to diminish deposit formation risk, low surface tension, low corrosion rate, and compatibility with inhibitors added to commercial acid, which will enhance efficiency of acid treatment using composition of invention. Composition is made up of, wt %: inhibited hydrochloric acid 8.0-15.0, fluorine-containing reagent (hydrofluoric acid, ammonium bifluoride, or ammonium fluoride) 1.5-10.0, boric acid 1.0-3.0, additionally isopropyl alcohol 5.0-10.0, and "Alkylfosfat-Khimeko" or "Efiroks-7", or "Fosfol-10" 0.5-2.0, and fresh water to 100%. In a method of acid treatment of the bottom area of terrigenous formation comprising consecutively pumping flushing fluid and acid composition into borehole, forcing the latter into formation by the aid of flushing fluid, giving time (up to 8 h) for reaction and subsequent removal of reaction products. Acid composition is used as it is or in the form of aqueous solution obtained by diluting composition with fresh water at water-to-composition ratio (1-5):1 in amount corresponding to 0.5-2.0 m3 per 1 m of perforated thickness of the formation. As flushing fluid, 1.5-3.0% ammonium chloride solution is used in amount 0.5-1.5 m3/m before pumping of acid composition or in amount 1.0-5.0 m3/m when used to force acid composition. |
| Composition for declaying of bottom-hole formation zone / 2246612 Declaying composition contains clay dispersing reagent, peroxide compound and water, wherein as peroxide compound potassium fluoride peroxysolvate in activated form, comprising 1-3 mass % of oxalic or salicylic acid; and includes two sequential technological solutions. More specifically claimed composition contains (mass %): technological solutions 1: potassium fluoride peroxysolvate 1-2.5; hydrochloric acid as clay dispersing reagent 3-8.0; and balance: water; technological solutions 2: potassium fluoride peroxysolvate 1-2.5; sodium hydroxide as clay dispersing reagent 4-6.0; and balance: water. In addition said solution contain 0.1-1.0 mass % of water soluble surfactant. After treatment with disclosed solutions and well exposure dispersed reaction products are removed from bottom-hole formation zone. |
 Method for increasing productiveness of oil and gas wells / 2247234Method includes acidic treatment of bed, calculation of hardness decrease and pressure of rocks tearing and pressure for pressing working solution into bed, completion of well and the actual hydraulic tear. Pressure for pressing is determined from formula Pht=(2μ·Pm/(1-μ)+(1-3μ)·Pb/(1-μ), where Pht - rocks tear pressure, Pm - mountain pressure, Pb - bed pressure, μ - Poisson coefficient. |
 Oil extraction methods / 2247235Method includes treatment of face area of oil bed by hydrophobic powder in organic and pushing oil away from collector with following delivery of oil from face-adjacent area of extraction well for processing of oil-containing terrigenic bed into organic solvent additionally inserted is copolymer of ethylene with vinylacetate, well treatment is performed with relation of components in percents of mass: said powder 0.05-2, said copolymer 0,05-2, organic solvent - the rest. |
 Method for range-wise treatment of productive layer through open horizontal well shaft and device for realization of said method / 2247832Method includes determining porosity, penetrability and oil saturation level of shaft-adjacent area along whole length of deflected shaft. On basis of these ranges with low penetrability are detected, caverns presence level and diameters of shaft on ends thereof are determined. With consideration of characteristics of detected ranges at surface a pipe assembly is assembled, at end of which a ring saddle is mounted for locking ball, on both ends - hydraulic packers. Between these in assembly pipe a radial through calibrated channel is made. Pipe assembly is fixed at end of pipes column and these are lowered into chamber to level of deflected shaft mouth. With unpacked packers straight and backward washing of shaft is performed. After that acid is pumped into well in amount, equal to amount of first treatment range. Locking ball is dropped, first from the face shaft range with low penetrability is packed and concurrently acid is pressed therein, after that well is left for reaction. Then both packers are unpacked, backward washing of shaft is performed. By raising pipe column, pipe assembly with packers is transferred in backward, from face, direction into area of second, from face, range with low penetrability and above-mentioned operations are repeated. In turns, operations with each treatment range are performed. |
 Method for acidic treatment of productive bed / 2247833Method includes serial pumping of film-forming hydrocarbon liquid and hydrochloric acid with adding of salt-acidic corrosion inhibitor to these, as said inhibitor a special paraffin deposits inhibitor is used, in form of composition of surfactants and aromatic solvents, while hydrochloric acid with addition of inhibitor before pumping is dispersed with gas to receive foam. |
 Method for processing underground productive beds / 2249097Method includes injection of processing liquid into bed, which liquid contains solved or dispersed in water complicated ether and polymer destructor, selected from oxidizing destructor and ferment destructor in such a way, that complicated ether is hydrolyzed with production of organic acid for solution of material soluble in acid, present in filtering layer or adjacent to it or in other damage in productive bed, and polymer destructor destroys polymer material, present in filtering layer or bio-film in productive bed. |
FIELD: oil and gas industry.
SUBSTANCE: method for near well-bore treatment with acid involves at the first stage pumping into the well of 10-15% aqueous solution of hydrogen chloride in a volume calculated on the basis of 0.25-0.5 m3 per 1 running metre of penetrated stratum depth; at the second stage - pumping of 10-15% aqueous solution of hydrogen chloride with a retarder of the acid reaction with rock in the volume of 2-5% of acid solution volume in total volume of pumping calculated on the basis of 1-1.5 m3 per 1 running metre of penetrated stratum depth at initial pressure equal to the final pressure value during pumping at the previous stage; overflushing by oil in volume of 5-15 m3 at initial pressure equal to the final pressure value during pumping at the previous stage; soaking during 16-48 hours and input of the well into operation.
EFFECT: improvement in efficiency of near-wellbore treatment.
3 ex
The invention relates to the oil industry and may be used in the acid treatment zone.
There is a method of acid treatment of bottom-hole zone of a petroleum layer, which includes the injection of a whipstock - hydrocarbon gel prepared with using «-N»activator «-N and diesel fuel and the subsequent processing at least one zone of formation of hydrochloric acid with concentration from 12 to 24%, while in case of repeated processing operations hydrochloric acid apply with decreasing concentration and the reduction of its volumes (RF Patent №2456444, publ. 20.07.2012).
The closest to the proposed invention is essentially a technical method of extraction of oil by injection acid composition, containing the acid, and composition containing surface-active agent (surfactant) and liquid hydrocarbon acid composition additionally contains retarder to the reservoir rock - or Zeolite, or crumb of synthetic zeolites, or concentrate syenite , or sodium lignosulfonates, or carboxymethylcellulose CMC, or CMC brand CMC-9, CMC-9S, or , or aluminum, in the following ratio of components, mass%: acid 97,5-99,9 specified moderator 0,1-2,5, injecting acid composition is carried out before or along with the song, containing surfactant and liquid hydrocarbons at a ratio Mac.%: Surfactants 5-16, liquid hydrocarbon 84-95, with a ratio of its volume to the volume of the acid composition from 2 to 4. And perform the injection of the components of both in production and injection wells (RF Patent №2295635, . 20.03.2007 - prototype).
General the disadvantage of this method is the low efficiency of processing, as expressed in a minor increase of well productivity after processing.
The proposed invention solves the problem of increase of efficiency of processing.
The task is solved by a method of acid zone, including at the first stage injection into the well 10-15%aqueous solution of hydrochloric acid from the calculation 0,25-0,5 m 3 1 m a perforated thickness of a seam, at the second stage pumping 10-15%solution of hydrochloric acid with the moderator reaction in the volume of 2-5% of the volume of the solution acid based 1.0 to 1.5 m 3 1 m a perforated capacity of the reservoir when the initial pressure equal to the end-pressure injection in the previous step, oil in the volume of 5-15 m 3 when the initial pressure equal to the end-pressure injection in the previous step, the technological holding during the 16-48 hours and putting well into operation.
The essence of the invention
Carbonate reservoirs are characterized by multidirectional fracturing, heterogeneity and a low coefficient of oil extraction.
In the case of a high viscosity of the oil produced after drainage of the collector, directly adjacent to the perforations well, there is a sharp drop in oil production rate, caused by the non-Newtonian properties of reservoir fluid. Existing technologies are not effective in these circumstances. The offered complex processing of carbonate reservoir aims to involve in the development of low-permeability and isolated zones of the layer. The consequence of this is to increase the production of the well and, ultimately, the oil recovery.
In the course of processing the increase permeability of the reservoir, improve reservoir properties of the layer through the use of hydrochloric acid, increase the coverage of acid stimulation by adding moderator acid reacts with the breed.
The important point is the continuity of performance of all works, i.e. injection components at a later stage of works with the initial pressure, equal to the final pressure on the previous stage.
The essential feature of the proposed invention is the ratio of injection solution of hydrochloric acid and hydrochloric acid solution with moderated as(0,25-0,5):(1,0-1,5). As the practice has shown precisely this correlation allows the greatest degree to increase well production as a result of processing.
The ratio of the components in solutions and volumes of injected components are defined from the practice as the most optimal solution. Going beyond the stated limits reduces the efficiency of processing.
As moderator of hydrochloric acid reaction with the breed use HCI-1, produced according to TU 2481-002-72650092-2009 or SNPH-8903 (specs 2458-314-05765670-2006 with MEAs. №1). Can be used classic retardants that are indicated when the description of the prototype.
Examples of specific performance
Example 1. Develop Deposit Bashkir tier. Collector - carbonate. The average well rate to 1.6 t/day., the average watercut of 11.6%. Plast has porosity of 13.2 percent, permeability 81,3 microns 2 * 10 -3 , oil saturation 82,4%, and the initial reservoir pressure 9 MPa, the depth of the soles of the reservoir 1041,5 m, reservoir temperature : 23 degrees C, viscosity oil in the reservoir conditions 292,5 MPa*s, the density of oil 937 kg/m 3 .
Through a stopped the oil well №1 in the layer with carbonate collector at the first stage pump 10%aqueous solution of hydrochloric acid in the amount of 3.5 m 3 (0.25 m 3 per 1 running meter perforated power) at initial pressure of 0.3 MPa and final pressure of 0.3 MPa, the second stage is injected 14 m 3 (1 m 3 1 p. m perforated layer thickness) 10%solution of hydrochloric acid with the moderator reaction HCI-1 in the amount of 2% from the volume of the acid solution at the initial pressure of 0.3 MPa and final pressure 0.5 MPa, produce oil in the volume of 5 m3 at home 0.5 MPa and final pressure of 1 MPa, conduct technological holding within 16 hours and impose the well into operation.
As a result of oil production increased from 1,8 to 4,5 m 3 /day.
Example 2. Perform as an example 1.
Through a stopped the oil well №2 in the reservoir with carbonate collector at the first stage pump 12%aqueous solution of hydrochloric acid in the volume of 10 m3 (0.4 m 3 per 1 running m perforated layer thickness) at initial pressure 0,25 MPa and final pressure 0,25 MPa, at the second stage pump 30 m 3 (1,2 m 3 per 1 running m perforated power formation) 12%solution of hydrochloric acid with the moderator reaction SNPH-8903 But in the quantity of 3.5% of acid solution at the initial pressure of 0.25 MPa and final pressure 0.5 MPa, produce oil in the volume of 10 m3 with the initial pressure of 0.5 MPa and final pressure 1.1 MPa, conduct the technological holding within 24 hours and impose the well into operation.
As a result of oil production increased from 1.8 to 4.8 m 3 /day.
Example 3. Perform as an example 1.
Through a stopped the oil well №3 in the reservoir with carbonate collector at the first stage pump 15%aqueous a solution of hydrochloric acid in the amount of 12 m 3 (0,5 m 3 per 1 running m perforated layer thickness) at initial pressure of 0,2 MPa and final pressure of 0,2 MPa, at the second stage pump 36 m 3 (1.5 m 3 per 1 running m perforated power layer) 15%solution of hydrochloric acid with the moderator reaction HCI-1 in the amount of 5% from volume of the acid solution at the initial pressure of 0,2 MPa and final pressure 1.6 MPa, produce oil in the volume of 15 m3 at the initial pressure of 1.6 MPa and final pressure 1.9 MPa, conduct technological holding within 48 hours and impose a well in operation.
As a result of oil production increased from 1.5 to 4.4 m 3 /day.
Application of the proposed method will allow to increase efficiency of processing zone.
Method of acid zone, including at the first stage injection into the well 10-15%aqueous solution hydrochloric acid in the amount of calculation 0,25-0,5 m 3 per 1 running m perforated thickness of a seam, at the second stage pumping 10-15%aqueous solution of hydrochloric acid with the moderator of acid reaction with the breed in the volume of 2-5% of the volume of the acid solution in the amount of downloads from the calculation of 1-1,5 m 3 per 1 running m perforated capacity of the reservoir when the initial pressure equal to the end-pressure injection in the previous step, oil in the volume of 5-15 m 3 when the initial pressure equal to the end-pressure injection in the previous step, the technological holding within 16-48 h and putting well into operation.