Method for well completion. RU patent 2490442.
 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. |
 Treatment method of bottom-hole zone of horizontal or inclined well / 2471978Treatment method of bottom-hole zone of horizontal or inclined well involves well treatment with the liquid providing the absence of absorption; viscous oil or fuel oil is used as the above liquid; then, the well is flushed with gas condensate; solution of acid is pumped to productive formation; technological exposure is performed for reaction of the acid solution; hydrocarbon solvent is pumped to perform the well flushing from residues of viscous oil or fuel oil and reaction products; well is developed by means of inert gas or gas from donor well. |
| Well bore zone treatment method / 2469190 Well bore zone treatment method involves determination of formation rock composition in the treated zone by means of carbon-oxygen logging (COL) immediately after well drilling and at content of carbonates in the formation rock of more than 5 wt %, irrespective of clay and quartz content, brine water mineralisation of 200-250 g/l, iron content of 2000-5000 ppm, content of layer of bitumen-resin-paraffin substances in oil, which is equal to 30-40 wt %, and well bore zone temperature of 60-160°C; treatment agent there used is the solution of "Khimeko TK-2K" Intensifying Compound in the ratio of the latter and the solvent equalling to 1:(1-5) 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: 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.
EFFECT: improvement in efficiency of the well treatment by an acid due to uniform treatment of all intervals of the horizontal borehole in dynamic mode with oil film washing-off from walls of the open hole and increase of acidized zone.
1 ex
Field : oil producing industry, particularly, to methods of oil production intensification of productive carbonate formations opened wells with open horizontal trunks.
There is a method of acid treatment of bottom-hole zone (oiz) in layers wells with open trunks, including descent tubing pipes (tubing) to slaughter, injection tubing calculated quantity of acid solution, injection of fluid in the cavity of the tubing string and extract acid reaction (technology "acid bath") [VG . Geological and technical measures during well operation. - M: Nedra, 1989. - p.62-64].
Disadvantage of this method is that the acid treatment is only the wall layer of the reservoir, and the pay matrix formation practically remains untreated depth.
The closest to the proposed invention is essentially a technical method of processing productive carbonate reservoir, including descent tubing pipes into the well, the installation Shoe columns in the interval of treatment, injection of acid solution pipes and the impact of them on the reservoir rock. In well before the descent tubing pre-allocate processing intervals in oil-saturated reservoir rocks and Shoe pipe string will equip the device with nozzles, radially placed under the angle of 90 or 120° generatrix, and acid injection into the reservoir carry out portions mode the wet ditch impact, alternating portions acid portions of sand and aqueous solution of surface-active substances, which perform Hydra-jet impact on the formation, and the alternation of acid wet ditch and impacts carry out alternately in the middle each processing interval (RF Patent №2205950, publ. 10.06.2003 - prototype).
Disadvantages of this method:
1. Injection of acid is the most permeable areas where there laundering and response with the breed. After moving nozzle to the next «point» by lifting of tubing is the next intervention. Accordingly interval horizontal wellbore 50-70 m not subjected to high-quality treatment, as in the intermediate intervals, the impact is acid with reduced reactive abilities. Thus, areas which were not produced impact, practically remained untreated. In addition, these sites at the top of the blocked oil, which leads to primary processing bottom of a horizontal wellbore.
2. When moving to the next «point» processing is necessary to raise a certain amount of tubing. Most often due to difference in specific gravity of the liquid in the tubing and annulus, well pours, which in turn requires wash well to balance the pressure. Accordingly layer is subjected to repeated impacts of technological liquids before each rise of tubing, which may lead to lower permeability.
All this reduces the effectiveness acid treatment of wells and leads to reduced yield.
In the proposed method the task of increasing the efficiency of acid treatment of wells at the expense of uniform treatment of all intervals horizontal wellbore in dynamic mode, with the removal of the protective oil film from the walls of the open trunk and increase the impact of acid.
The task is solved by the fact that the method of completion, which includes downloads in open-hole horizontal wells acid solution in the mode of the wet ditch impact, according to the invention, influence carry out through nozzles placed at the end of flexible tube, the nozzle is placed on the bottom of the wellbore pumped acid solution circulation to the mouth of the well, simultaneously with the circulation acid solution lift from wells flexible pipe with a speed not greater speed fill the wellbore acid solution, after filling horizontal wellbore acid solution is forced acid solution into the reservoir with a step rise of pressure and exposure at each stage, again descend flexible pipe with a nozzle at the bottom of a well and repeat the filling operations wellbore acid solution and bursting, spend the technological holding for the reaction of acid solution with the breed, raise flexible pipe in the interval pumping inert gas, pumped inert gas is removed by the level recovery curve, conduct cyclical killing of well-mode «injection of water - extract - overgrazing of oil» until full bleed oil, despise tubing and learn well.
The essence of the invention
In connection with active development of drilling horizontal wells of different designs and their length of increasing their effectiveness to date, there is a need of improvement of the technologies of acid horizontal wells. One of the reasons for low production efficiency treatments in horizontal shafts under traditional technology is that the active influence of the acid is only 3-4 plot (point) of the trunk, and the escaping of pore space oil POPs up and blocks the upper part of the horizontal wellbore that prevents the reaction of acid and carbonate rocks. The proposed invention solves the problem of increasing the efficiency of acid treatment of wells at the expense of uniform treatment of all intervals horizontal wellbore in dynamic mode, with the removal of the protective oil film from the walls of the open trunk and increase the impact of acid.
To increase the efficiency of processing of horizontal and multilateral horizontal wells proposed spraying technology permanent removal (rinsing) oil film. The claimed method realized in the following sequence.
In horizontal not wellbore despise flexible pipe type coil tubing with nozzle on the end. The nozzle is placed on the bottom of the wellbore. Open valve for wellhead pumped acid solution circulation to the mouth of the well and simultaneously with the submission of a solution acid lift from wells flexible pipe with a speed not greater speed fill the wellbore acid solution. After filling in the horizontal trunk acid, close to the mouth of the well valve is forced acid solution in the reservoir with the promotion of flexible pipe to the face of the wellbore and stepped rise of pressure and exposure on each stage. Mostly use the stepping mode in which each degree increase the pressure of 1.5-2.5 MPa exposure at each stage of 10-20 minutes Again descend flexible pipe with a nozzle at the bottom of a well and repeat the filling operations wellbore acid solution and bursting. Spend the technological holding for the reaction of acid solution with the breed mainly in 3-4 hours. Raise flexible pipe in the interval pumping inert gas approximately on depth of 600-800 m, pumped inert gas, e.g. nitrogen, reduces the pressure in the borehole and measure the speed of the raising the level of the fluid in the borehole, remove thus the level recovery curve. In this moment, well is partially filled in with oil in the upper part. In such a hole down the tubing is not possible due to security considerations of works. Spend cyclical killing of well-mode «injection of water - extract - overgrazing of oil». In the well crush the volume of water jamming at a pressure of not more than 6 MPa and waiting for the oil up to the mouth of the well of water-roughly 10-15 minutes Release the oil in the tank near the hole until the pressure in the well 0,5-1,0 MPa. Again crush into the well water volume killing, conduct technological holding and re-release surfaced oil. The operation is repeated until the full release of oil and filling the mouth of the well water. Despise tubing and learn well.
In result it is possible to achieve well flow rate exceeding the output of wells, obtained by the well-known technology.
Specific example of the
Application of the proposed method will allow to provide processing with the horizontal borehole mode cleaned released oil prevents contact of rocks with acid. Ultimately, this will increase the productivity of the well.
Way well completion, including downloads in open-hole horizontal wells acid solution in the mode of the wet ditch impact, wherein the influence carry out through nozzles placed at the end of flexible pipe nozzle placed at the bottom of the wellbore pumped acid solution circulation to the mouth of the well, simultaneously with the circulation acid solution lift from wells flexible pipe with a speed not greater speed fill the wellbore acid solution, after filling in the horizontal trunk acid solution is forced acid solution into the reservoir with a step rise of pressure and exposure at each stage, again descend flexible pipe with a nozzle at the bottom of a well and repeat the filling operations wellbore acid solution and bursting, spend the technological holding for the reaction of acid solution with the breed, raise flexible pipe in the interval pumping inert gas, pumped inert gas is removed by the level recovery curve, conduct cyclical killing of well-mode «injection of water - extract - overgrazing of oil» to full bleed oil, despise a submersible pump and run well at work.