122results about How to "Restore permeability" patented technology

Well treatment is disclosed that includes injecting a well treatment fluid with insoluble polyol polymer such as polyvinyl alcohol (PVOH) dispersed therein, depositing the insoluble polymer in the wellbore or an adjacent formation, and thereafter dissolving the polymer by reducing salinity and / or increasing temperature conditions in the environment of the polymer deposit. The method is disclosed for filter cake formation, fluid loss control, drilling, hydraulic fracturing and fiber assisted transport, where removal of the polyol at the end of treatment or after treatment is desired. The method is also disclosed for providing dissolved polyol as a delayed breaker in crosslinked polymer viscosified systems and viscoelastic surfactant systems. Also disclosed are well treatment fluids containing insoluble amorphous or at least partially crystalline polyol, and a PVOH fiber composition wherein the fibers are stabilized from dissolution by salinity.

The present invention generally relates to a method and a composition useful in restoring the permeability of a porous underground petroleum containing formation. Restoring permeability to the formation enhances the injectivity thereby accelerating petroleum recovery. The method of the invention comprises treating said formation with a composition which comprises a combination of at least one nonionic compound, preferably an alkoxylated alcohol, with at least one cationic compound, preferably a quaternary ammonium compound, in an amount effective to improve the permeability of the formation. The composition may also optionally contain an alkyl glycoside.

Well treatment is disclosed that includes injecting a well treatment fluid with insoluble polyol polymer such as polyvinyl alcohol (PVOH) dispersed therein, depositing the insoluble polymer in the wellbore or an adjacent formation, and thereafter dissolving the polymer by reducing salinity and / or increasing temperature conditions in the environment of the polymer deposit. The method is disclosed for filter cake formation, fluid loss control, drilling, hydraulic fracturing and fiber assisted transport, where removal of the polyol at the end of treatment or after treatment is desired. The method is also disclosed for providing dissolved polyol as a delayed breaker in crosslinked polymer viscosified systems and viscoelastic surfactant systems. Also disclosed are well treatment fluids containing insoluble amorphous or at least partially crystalline polyol, and a PVOH fiber composition wherein the fibers are stabilized from dissolution by salinity.

A clay stabilizer which is capable of inhibiting swelling in a wide variety of clay types and is also capable of restoring permeability in formations which have previously been damaged by clay swelling. Amine salts of differing molecular weights configurations and ionic strength are combined to provide transport into micropores, mesopores and macropores in the formation and to effect cationic change therein. A poly quaternary amine having a high to very high charge density is added along with lower molecular weight amine salts to substantially permanently exchange cations with the clay in the formation.

New devices and methods for diagnosis and compositions and methods for treatment of cancers use combinations of antimicrobial agents and agents that can reverse dormancy and hibernation pathways. We unexpectedly found that surprisingly low doses of anti-hibernation compounds can substantially inhibit cancer cell growth in vitro and can successfully treat cancers, including metastatic cancer. We also unexpectedly found that antimicrobial agents and anti-HDS compounds together can increase the degree of inhibition of cancer cell growth in a synergistic fashion. We conclude that combination therapy with antimicrobial agents and anti-HDS compounds can be effective in treating human patients with cancer.

The invention relates to a blockage remover for decompression and steam injection in a high clay content sandstone oil reservoir. The blockage remover consists of organic blockage remover and subject inorganic blockage corrosion agent. By adopting the blockage remover provided by the invention, blockage removal in deep sandstone reservoir stratum with high clay content, loosen cementation and low penetration can be realized, the penetration rate in an acidification band is improved to the maximum degree, the pressure of steam injection is reduced, and the quality of steam injection is improved.

The invention relates to a neutral blocking remover composition for oilfield oil extraction, which is prepared from the following components in parts by weight: 30-35 parts of acrylic acid-methyl acrylate copolymer, 44-50 parts of diethylene triamine pentaacetic acid, 30-35 parts of sodium polyepoxysuccinate, 30-35 parts of amine malate, 10-14 parts of sodium alkyl sulfonate, 5-8 parts of amine hydroxy ethylidene diphosphate, 10-14 parts of hydrolyzed polyacrylamide, 12-17 parts of atlapulgite, 20-25 parts of sodium persulfate, 7-10 parts of sodium lignosulfonate, 5-8 parts of tannin, 12-16 parts of sodium malate, 5-8 parts of sodium sulfosuccinate, 5-8 parts of starch, 9-12 parts of methyl lactate, 0.2-0.3 part of vanadium pentoxide and 0.1-0.3 part of diisobutyl carbinol. The neutral blocking remover composition for oilfield oil extraction has the advantages of high blocking removal speed, no corrosivity due to neutrality and no dead area, can quickly dissolve the material scales, clean the oilfield stratum and remove blocking, and does not generate the phenomenon of precipitation or secondary blocking; and the cleaning waste liquid does not need to be subjected to sewage treatment after returning to the ground.

The invention relates to a carbon dioxide acidification blocking remover and a process of not reversely discharging raffinate after acidification. The blocking remover comprises a reagent A which is prepared by directly mixing hydrochloric acid, hydrofluoric acid, glacial acetic acid, polyoxyethylene alkyl phenol ether, citric acid, a corrosion inhibitor, a mutual solvent and a clay stabilizer to form a homogeneous solution and a reagent B prepared by mutually mixing carbonate, a surfactant, an iron ion complexing agent, a demulsifier and clean water which are stirred for 1 hour at normal temperature. The process of not reversely discharging raffinate after acidification comprises the following steps: when an oil well is deblocked, first, injecting a medicament A into an oil layer; then, isolating the clean water by layers; then, injecting a medicament B into the oil layer; and finally, injecting clean water to extrude a mixture in a shaft to the stratum, then, injecting an acidizer into a loop space to a perforated interval, closing the well for 4-6 hours, opening the well, observing the pH value (control range from 6-7), periodically injecting the acidizer till raffinate is fully discharged out of the stratum, and finally, injecting clean water to extrude the mixture in the shaft into a dryline.

The invention provides a preparation method of a high temperature resistant contraction-expansion system for promoting stratum clay modification. The high temperature resistant contraction-expansion system is prepared from the following raw materials in parts by mol by using the preparation method in the following steps: a. adding dimethylamine into a reaction kettle, controlling the temperature to 25-45 DEG C, adding epoxy chloropropane while stirring according to a ratio of dimethylamine to epoxy chloropropane of (3-4): 1, heating up to 65-70 DEG C when adding the epoxy chloropropane to 40-60% of the dosage, and then, adding the residual epoxy chloropropane, and reacting for 2-3 h to obtain an intermediate A; b. firstly dissolving potassium hydroxide in water and adding crylic acid in the aqueous solution of potassium hydroxide according to a mol ratio of dimethylamine to crylic acid of 1: (0.05-0.1) and a mol ratio of crylic acid to potassium hydroxide of 1: (0.8-1.2), and then, adding acrylamide according to a mol ratio of crylic acid to acrylamide of 1: (0.2-0.5) to obtain a mixed solution; and c. adding an initiator into the mixed solution obtained in the step b under nitrogen protection, stirring to react for 2-3h, adding the intermediate A obtained in the step a, and reacting for 2-3 h to obtain a product.

A clay stabilizer which is capable of inhibiting swelling in a wide variety of clay types and is also capable of restoring permeability in formations which have previously been damaged by clay swelling. Amine salts of differing molecular weights configurations and ionic strength are combined to provide transport into micropores, mesopores and macropores in the formation and to effect cationic change therein. A poly quaternary amine having a high to very high charge density is added along with lower molecular weight amine salts to substantially permanently exchange cations with the clay in the formation.

New devices and methods for diagnosis and compositions and methods for treatment of cancers use combinations of antimicrobial agents and agents that can reverse dormancy and hibernation pathways. We unexpectedly found that surprisingly low doses of anti-hibernation compounds can substantially inhibit cancer cell growth in vitro and can successfully treat cancers, including metastatic cancer. We also unexpectedly found that antimicrobial agents and anti-HDS compounds together can increase the degree of inhibition of cancer cell growth in a synergistic fashion. We conclude that combination therapy with antimicrobial agents and anti-HDS compounds can be effective in treating human patients with cancer.

The invention relates to the technical field of online sewage treatment, in particular to sewage treatment equipment with an automatic dosing function. According to the equipment, water flow of a water inlet pipe is used as power to react with a blade in a treatment cavity to push the blade to drive a driving shaft to rotate. Along with the rotation of the driving shaft, a cam on the driving shaft also rotates along with the driving shaft, and the tip of a bulge is periodically close to, propped against and jacked up a bottom plate, so that a lifting rod intermittently pushes a sealing block to move upwards and opens the bottom end of a medicine tank, and the medicine intermittently flows into the treatment cavity through a medicine discharging pipe, is mixed with water flow and flows rightwards; therefore, the medicine discharging amount and the sewage amount are automatically synchronized, and manual intervention is not needed. Meanwhile, along with the rotation of the driving shaft, a first-class stirring rod at the right section also rotates along with the driving shaft and generates a stirring effect, so that the medicament and the sewage are mixed and react to generate reactants such as solid precipitates or dregs, and the purification is realized.

The invention relates to a rapid manual land infiltration treatment system and a method for purifying river water by applying the same. The treatment system consists of a water inlet pump, a regulating tank, a flow meter, an infiltration tank, a water collecting tank, a water distribution pipe entering the infiltration tank, and a water collecting pipe flowing out of the infiltration tank. Natural sand and at least one of zeolite and lava are used as a filling of the infiltration tank. When in operation, the infiltration tank is biologically domesticated and cultured by means of natural biofilm culturing in advance, is alternatively water-flooded for 12 to 72 hours, and are dried for 12 to 72 hours in 20 to 80 days in total of domestication; river sewage enters the regulating tank after being pumped by the water inlet pump, and are settled for 0.5 to 5 hours in the regulating tank; the settled sewage is distributed by the water distribution pipe and freely flows into the infiltration tank; after the settled sewage is water-flooded for 12 to 72 hours and dried for 12 to 72 hours, the infiltration solution is collected by the water collecting pipe and is then discharged into a river.

The invention relates to pumping engineering, mainly to well pumping devices for extracting oil from wells. The inventive method consists in assembling from the bottom upward an input cone provided with a shank, a packer and a jet pump and in running said assembly with the aid of a tubing string into a well. Afterwards, a receiver transformer of physical fields is also run into said well, background measurements of temperature and other physical fields are carried out, a formation is drained and the work of the individual interlayer of a productive strata is evaluated. An ultrasonic action is performed on the productive strata. The hydrodynamic action being performed on the productive strata during said operation, the entire formation is exposed to the combined action of ultrasonic oscillations and a hydrodynamic effect. Afterwards, the unit for ultrasonic effect is pulled out from the well to the surface. The hydrodynamic and geophysical investigations of the well being carried out using the jet pump and replaceable functional inserts, the assembly and the jet pump are pulled out from the well to the surface and the well is prepared in order to be put into operation. The invention makes it possible to optimise the dimensions of various elements of the device, thereby increasing the operating reliability and performance of the well jet device during the treatment of the productive strata.

The invention provides a temporary plugging agent and a preparation method thereof. With the total mass of the temporary plugging agent as 100wt%, the temporary plugging agent comprises the raw materials of 25-35wt% of a high temperature salt-resistant extra high molecular polymer, 25-30wt% of modified oil soluble resin, 15-20wt% of a cross-linking agent, 5-10wt% of a surface active agent, 1-5wt% of solid particles and 1-5wt% of a fiber temperature-resistant material, wherein the sum of the mass percents of the raw materials of the temporary plugging agent is 100%; and the raw materials of the temporary plugging agent are all solid particles, and the diameters of the particles are 200-300 meshes. The invention further provides the preparation method of the temporary plugging agent. The temporary plugging agent can conduct continuous sand washing on an oil well, change of output after operation is not large, and construction and plug removal can succeed for one time; and the temporary plugging agent is suitable for sand washing construction of a heavy oil well, the sand washing effect is good, sand washing is thorough, the leakage amount is less, and the pump inspection period is prolonged.

The invention provides a PGZ oil field abandoned well exploitation recovery and production increasing novel technique, aims to improve crude oil recovery exploitation degree and greatly improve well yield and change abandoned dead oil field with high water content into living oil field capable of producing oil base on operation and construction treatment. According to the PGZ oil field abandoned well exploitation recovery and production increasing novel technique, a slowly expanding selective water plugging technique and a slowly expanding selective water plugging fixing technique with high plugging intensity, good stability, long effective period and no perpetual harm to stratum are adopted and a critical novel technique enabling fluid to steering flow is introduced. The dominant mechanism of the fluid steering flow technique is that water in high pressure water layer leaks into matrix oil layer at the presence of a steering agent and crude oil in the matrix oil layer is driven to flow to a shaft bottom under flow pressure difference, so as to be exploited.

The invention relates to a biological enzyme fracturing outlet liquid recovery oil displacement and a plugging relief technology comprising the following steps: (1) after biological enzyme fracturing outlet liquid is subjected to gel breaking, a flocculating agent or an adhesive mud removing agent or a bactericide is added into the biological enzyme fracturing outlet liquid to accumulate suspended matters and sterilize the fracturing outlet liquid; (2) the sterilized biological enzyme fracturing outlet liquid is initially filtered and recovered by a well cleanout truck with a filtering function or a precise filter; (3) the recovered biological enzyme fracturing outlet liquid is finely filtered again from 2 microns to 150 microns by the precise filter according to requirements; and (4) after the recovered biological enzyme fracturing outlet liquid is finely filtered, a chemical agent is added into or compositely prepared with the biological enzyme fracturing outlet liquid. The recovery rate of the biological enzyme fracturing outlet liquid processed by the technology can reach more than 70 percent, the invention thoroughly solves the problem of the environment pollution of the biological enzyme fracturing outlet liquid, enhances the recovery ratio of crude oil by more than 6-18 percent, prevents incrustations being accumulated again and reduces the oil-water interfacial tension.

The invention discloses a nano-micron self-soluble temporary plugging steering agent for acidification; the steering agent comprises the following components in parts: 0.5-1.5 parts by mass of an ironion stabilizer, 0.5-1.5 parts by mass of a clay stabilizer, 0.5-1.5 parts by mass of a discharge assisting agent, 0.5-1.5 parts by mass of a high temperature corrosion inhibitor, 0.05-0.15 part by mass of a dispersant, 0.1-0.3 part by mass of a suspending agent, 30-50 parts by volume of concentrated hydrochloric acid, 7-20 parts by mass of sodium chloride and 25-30 parts by mass of water. The formed steering agent is a sodium chloride particle substance with the particle size of less than 3 [mu]m, can enter a deep part of a reservoir and temporarily plug a high-permeability layer and net seams; along with the end of acidification construction, the sodium chloride particles playing the temporary plugging effect are dissolved in less than 10% of an acid residual liquid or formation water and plugging is removed. The steering agent does not contain organic polymer compounds, has the characteristics of no need of glue crosslinking, no need of glue breaking, self plugging removal, little damage to formation, simple preparation method, low cost and the like.

The invention provides low-solid-content reservoir protection workover fluid and a preparation method thereof.The low-solid-content reservoir protection workover fluid comprises pre-gelatinized starch and salt-resistant and corrosion-resistant saturated sodium chloride water, wherein the ratio of the weight of the pre-gelatinized starch to the volume of the salt-resistant and corrosion-resistant saturated sodium chloride water is 80-100:300-350.The pre-gelatinized starch comprises, by weight, 10 parts of modified starch, 0.4-1.0 parts of sodium hydroxide and 100 parts of water.The salt-resistant and corrosion-resistant saturated sodium chloride water comprises, by weight, 100 parts of water, 32 parts of sodium chloride, 2-4 parts of acid-soluble shielding temporary plugging agent, 4 parts of sterilizing agent, 2 parts of corrosion inhibitor and 0.1-0.2 part of defoaming agent.The low-solid-content reservoir protection workover fluid has the advantages that the workover fluid is stable in performance, and mud cake can be acidized and degraded.

The invention relates to the technical field of oil field blockage removal, in particular to a deep blockage removal process of biological enzyme composite acid. The deep blockage removal process of the biological enzyme composite acid comprises the following steps that (1) a biological enzyme blockage removal agent is injected into an oil well; (2) the composite acid is injected into the oil well; (3) displacement fluid is injected into the oil well; and (4) shut-in reaction is carried out. According to the deep blockage removal process of the biological enzyme composite acid, the formula andthe dosage of the composite acid are adjusted according to the actual situation on site, polymer macromolecules wrapped outside inorganic impurities are effectively degraded, the inorganic impuritieswrapped in the polymer macromolecules are fully exposed, fully erosion of the inorganic impurities by the subsequent acidification process is facilitated, so that the formation blockage of oil and water wells is removed in limiting and complete modes, the formation permeability is restored, and oil fields can recover the production capacity normally.

The invention discloses an acid-soluble cement temporary plugging agent and a preparation method thereof, and belongs to the field of oil well cementation. The temporary plugging agent comprises, by weight part, 1 part of reheated magnesia, 0.5-1.0 part of magnesium chloride, 0.05-0.15 part of magnesium carbonate, 0.1-0.4 part of calcium carbonate, 0.01-0.05 part of sodium tripolyphosphate, 0.005-0.01 part of ultrafine silica, 0.01-0.04 part of ammonium phosphate, 0.01-0.05 part of a retarder, 0.03-0.06 part of a fluid loss additive, and 0.3-0.6 part of water. According to the provided acid-soluble cement temporary plugging agent, the retarder can adjust the setting time of the acid-soluble cement temporary plugging agent and makes the acid-soluble cement temporary plugging agent suitable for an oil well of 30-100 DEG C, so that it is ensued that an oil well with relatively high temperature is temporarily plugged. The fluid loss additive can improve the plugging ability of the acid-soluble cement temporary plugging agent and reduces the water loss of the acid-soluble cement temporary plugging agent, so that the plugging effect on the reservoir is ensured. The acid-soluble cement temporary plugging agent is wide in application range, good in temporary plugging effect, and suitable for large-scale popularization and application.

The invention provides a method for determining the subsurface fracture opening. The method particularly comprises the steps that a fracture detection area is determined, lithostatic confining pressure of the area where a subsurface fracture with the depth x is located is measured, and the subsurface fracture opening ei is calculated according to the formula ei=a<f(x)>+b, wherein f (x) is the lithostatic confining pressure of the area where the subsurface fracture with the depth x is located, and a and b are both fitting coefficients obtained through digital fitting. According to the technical scheme, a feasible way is provided for determining the fracture opening, porosity and permeability under the formation confining pressure condition, real distribution of the natural fracture opening, natural fracture porosity and natural fracture permeability under different formation confining pressure conditions can be restored quantificationally, and an effective means is provided for objectively and reasonably evaluating the reservoir and seepage effects and contribution of natural fractures in a compact low permeability reservoir.

The invention discloses a method for performing surface slow-rate infiltration land treatment on rural domestic wastewater and belongs to sewage treatment (CO2F). The problems that centralized treatment of the rural domestic wastewater is difficult because the rural infrastructure falls behind, the capital is in shortage and the traditional treatment process is complex are solved. The technology mainly comprises three systems, namely a dry-wet separation pool, a collection and sedimentation tank and a surface slow rate infiltration ditch, so that economical, high-efficiency and energy-saving treatment on the sewage can be realized. The method has the advantages of low one-off infrastructure investment, low operating cost, simplicity and convenience in management, stable long-term operation effect and the like, and quasi unmanned operation can be realized. The method is especially suitable for centralized treatment of rural medium / low-concentration domestic wastewater in rolling countries in the middle west and also can be suitable for centralized treatment of rural aquaculture wastewater and domestic wastewater in small towns.

The invention discloses a method for plugging formation leakage and improving bearing capability of a formation based on the capsule-type expansion body heated at ground temperature. The capsule-typeexpansion body consists of a capsule-type expansion body shell and a liquid or solid temperature control expansion material, enters a well circumference and formation cracks and holes far away from the body with drilling fluid circulation, is heated to a certain temperature range with the ground temperature, then quickly and remarkably expands, elastically deforms to self-adapt to plugging of various types of leaked formations and improve the bearing capability of the formations. The capsule-type expansion body is divided into a physical gasification type or chemical decomposition reaction type according to the expansion principle of the liquid or solid temperature control expansion material, is kept in a non-expanding state during relatively low-temperature ground transportation and in-shaft circulating flow, and has the advantages of quick and effective plugging, self adaptation, long distance, dismounting and the like when producing quick and remarkable volume expansion and pluggingformation leakage at physical and chemical reaction temperatures.

The invention discloses antibacterial and anti-inflammatory mouthwash and a preparation method thereof. A main effective component of the mouthwash is a traditional Chinese medicinal extract. The Chinese medicinal extract is prepared from the following raw materials in parts by weight: 25 to 30 parts of rose flower, 4 to 8 parts of flower and root of rosa multiflora, 15 to 20 parts of honeysuckle flower, 6 to 12 parts of herba houttuyniae, 8 to 13 parts of fructus forsythia, 3 to 6 parts of all grass of tagetes patula L, 2 to 4 parts of fructus toosendan, 6 to 8 parts of cortex magnoliae officinalis, 10 to 15 parts of Chinese gall, 4 to 6 parts of roughhaired holly root, 6 to 8 parts of rhizoma polygoni cuspidati, 8 to 12 parts of radix bupleuri, 28 to 35 parts of fresh green lemon, 7 to 10 parts of radix paeoniae alba, 8 to 12 parts of eucalyptus globules and 6 to 9 parts of prepared liquorice root. The mouthwash can realize antibacterial and anti-inflammatory effects while teeth are cleaned in a mouth rinsing process; the mouthwash has the efficacy of effectively inhibiting pathogenic bacteria in an oral cavity from breeding, preventing and treating diseases such as pericoronitis of the wisdom tooth, and preventing serious systemic complications caused by oral diseases such as bacteremia and septicemia.

The invention discloses a covering, infiltration and leaching device for saline-alkali soil improvement, and a saline-alkali soil improvement engineering operation method. The infiltration and leaching device is mainly composed of: a fixing support, a covering component, a walking device, walking wheels, drip irrigation branch pipes, and the like. The two agricultural modes of drip irrigation and covering are combined for the first time and then innovatively applied to saline-alkali soil treatment; a movable saline-alkali soil covering, infiltrating and leaching device is developed, and an original broad irrigation mode is changed into a small-amount and multi-time infiltrating and leaching mode, so that ineffective consumption of water resources caused by saline-alkali leaching is greatly reduced. According to the operation method, the hardened saline-alkali soil is deeply scarified through in-situ spray explosion, the fundamental problem of salt return caused by the soil capillary effect is thoroughly solved while the permeability of the soil is recovered, that is, the capillary in the soil is cut off through shock wave spray explosion deep scarification soil and shock wave spray sand filling, and the capillary is kept in a fractured state for a long time. A covering, infiltrating and leaching device is used for salt leaching, so that an economical and feasible method is provided for solving the problem that saline-alkali soil treatment is prone to repetition.

The invention discloses a method of processing a cement sheath outside a screen pipe after cementing well completion. The method includes crushing the cement sheath outside the screen pipe without perforating to greatly reducing production cost. The method is particularly suitable for horizontal wells. The method includes closing a sleeve pipe valve and a blowout preventer on a wellhead after a cement sheath extrusion pickling string outside the screen pipe is tripped to the design position of the screen pipe, utilizing a cement sheath expulsion device of the cement sheath expulsion pickling string outside the screen pipe to seal a annulus between an oil tube and the screen pipe, expulsing and crushing the cement sheath outside the screen pipe outside the cement sheath expulsion device from the front of the oil tube to finish lower probing segment by segment to an artificial bottom of a well, utilizing the cement sheath expulsion pickling string outside the screen pipe to open a well washing valve at the artificial bottom of the well to build a reverse circulation well washing tunnel, pickling a near wellbore formation with flushing fluid, and conveying disintegrating slag and dirt of the cement sheath outside the screen pipe out of the well to the ground. The processing method is capable of reaching purposes that the next string can finish crushing cement sheath outside screen pipes and utilize pickling solution to wash a well, so that production and construction cost can be greatly reduced.

The invention discloses a sewage infiltration purification treatment method. Sewage passing a grating is collected into a settling tank, flocculating agents are added and settled for 12-36 hours, thesewage is conveyed to an infiltration device, infiltrated and purified, the infiltration device comprises a primary infiltration tank and a secondary infiltration tank, the settling tank, the primaryinfiltration tank and a secondary infiltration tank are stepped, the sewage sequentially passes the settling tank, the primary infiltration tank and the secondary infiltration tank, and finally, effluent quality meets national discharge standards. A constructed wetland technology, a biological treatment technology and a multilayer infiltration technology are effectively and organically combined and integrated, suspended matters, total phosphorus, total nitrogen and ammonia nitrogen in the sewage can be effectively removed, and the method is low in energy consumption, small in occupied area, low in operation cost, convenient in management and maintenance, low in equipment counterfeiting cost and wide in applicable place and applicable landform range and has a good application prospect.

The invention belongs to the technical field of in-situ leaching uranium mining. Aiming at the serious chemical plugging formed by an ore bed in an acid-method leaching process, the invention providesan acid-method in-situ leaching mine stratum plug-removing method. According to the method, chemical plugging is dissolved through sequentially injecting a first-stage plug-removing agent (containing30 to 40 percent of industrial hydrochloric acid solution, 1 to 2 percent of corrosion inhibitor, 3 to 10 percent of industrial HF solution and 1 to 2 percent of iron stabilizing agent), a second-stage plug-removing agent (containing 15 to 20 percent of industrial multi-hydrogen acid solution, 1 to 2 percent of corrosion inhibitor and 1 to 2 percent of iron stabilizing agent), and an anti-swelling displacement fluid prepared from a surface active agent and clear water into a wellhead. The method has the beneficial effects that the chemical plugging near a filter and at a near-well-bore area and a stratum deep part can be removed, the ore bed and a leaching channel near the filter can be corrected, the permeability of a stratum is recovered, the acid-method in-situ leaching hole-drilling production capacity is improved, and the economic exploitation of a uranium resource is realized. The preparation of the all plug-removing agents is accomplished in a transfer groove, the plug-removingagents self-flow to a plug-removing agent preparation tank by utilizing an altitude difference, and the preparation process can be accomplished by only two persons.