68results about How to "Good slowing effect" patented technology

The invention discloses a composite blocking remover and a method for removing blockage of a compact sandstone reservoir pressing crack commissioning horizontal well in a composite manner. The composite blocking remover comprises a preposition liquid, a main treating fluid, an active blocking remover and a subsequent fluid. The preposition liquid is composed of organic acid, inorganic acid, a stabilizer, an oxidizing agent, a chelating agent, a corrosion inhibitor, polyol ether and water. The main treating fluid is composed of organic acid, inorganic acid, the stabilizer, the oxidizing agent, a fluorine carbon surfactant and water. The active blocking remover is composed of a zwitterionic surfactant, the stabilizer and water. The subsequent fluid is water. The composite blocking remover can remove the blockage of routine colloid, asphalt mass and inorganic solid phase particles, and can remove the damage of water blocking and crude oil emulsification by pertinency, and has the advantages of good slow performance, effectively preventing secondary deposition pollution such as the iron ion deposition and acid sludge generation, the horizontal well near-well and deep reservoir pollution can be effectively released, the oil well production power is recovered, and the recovery efficiency can be greatly increased.

The composite multifunctional chemical unblocking agent consists of organic multifunctional unblocking agent in 50-100%, inorganic multifunctional unblocking agent in 5-35% and composite synergist 25-35%. Its main components include C7-C10 aromatic hydrocarbon organic solvent, polyethenoxy ether as surfactant, oil soluble water dispersed polyether demulsifier, T penetrator, polyether wetting agent, mutual solvent, insoluble scale converting agent, composite organic / inorganic acid, cationic polymer as clay stabilizer, water soluble polyether demulsifier, iron ion stabilizer, polyether wetting improver, corrosion assistant, corrosion retardant, cationic polymer as sand stabilizer, etc. The composite multifunctional chemical unblocking agent is injected into treated oil well to produce lasting unblocking effect 10 times that of earth acid.

The invention relates to a novel modification system and process of a hot-dry-rock thermal reservoir, characterized by the combination of two stimulation measure processes, thermal stimulation and chemical stimulation. The process is characterized in that a naturally present fracture network is destructed by thermal stimulation to enhance permeability, partial minerals, scale and obstruction in shafts and fractures are dissolved by the chemical stimulation, and flow guiding capacity of the fractures is further improved. The repeating of the process enables a larger range of thermal reservoirs to be modified. By using the process, the problem of the prior art that after thermal stimulation, part of the fractures are closed along with the rise of the temperature of a cooling area and the problem that that a chemical stimulant disappears nearby an injection location during its excess speed of reacting with rock minerals at high temperature are solved, and the process enables greatly reduction in the risk of frequent microseism in a reservoir modification process when compared to traditional hydrofracturing. The process is widely applicable to the modification of hot-dry-rock thermal reservoirs.

The invention relates to a hydrophobically associated type cation acid solution retardant for oil gas well acidification in petroleum industry and a preparation method thereof. According to the invention, a retarded acid is utilized for acidifying deep parts of the stratum, in order to improve the acid treatment effect. The technical scheme is as follows: the acid solution retardant is polymerized from four monomers, including acrylamide AM, allylpolyoxyethylene ether APEG-1000, methacryloxyethyltrimethyl ammonium chloride DMC, and cetyl dimethyl diallyl ammonium chloride DMAAC-16. The method of preparation is as follows: adding APEG-1000 whose mole percent is 2.00-8.00% into a flask, adding water 50.00-150.00g, carrying out stirring and dissolving, adding materials in percentage by mole including 63.40-79.60% of AM, 15.80-28.25% of DMC and 0.30-0.70% of DMAAC-16, and obtaining a solution whose concentration is 15%; finally adding an initiator, allowing reaction for 6 hours at 50 DEG C, carrying out washing by ethanol and drying, and obtaining the acid solution retardant. The retardant has a good retardance performance, so that deposition is not easy to be produced, and the retardant has good heat stability, good temperature tolerance and compatibleness.

The present invention discloses a retardance and low damage acid solution system for high temperature condensate oil gas reservoir acidification. The acid solution system is suitable for acidification modification of high temperature deep well, particularly condensate gas reservoir, and comprises the following components, by weight, 0.5-3 parts of hydrofluoric acid or 6-12 parts of fluoroboric acid, 8-10 parts of an organic ester, 0.01-0.05 part of a catalyst, 0.1-1 part of a corrosion inhibitor, 0.1-1 part of an iron ion stabilizer, 0.1-1 part of a clay stabilizer, 1-2 parts of a cleanup additive, and 80-100 parts of water. According to the present invention, effects of retardance and corrosion inhibition of the acid solution system can be well achieved at a high temperature, and water blocking can be released and acid solution backflow can be easily achieved with the finally produced methanol and the carbon dioxide.

The invention relates to active mixed acid plugging removal solution applicable to a low permeability reservoir and mainly solves the problems of short period of validity and poor plugging removal and augmented injection effects when conventional mud acid and composite acid methods are adopted for plugging removal treatment on low permeability formation. The active mixed acid plugging removal solution consists of the following components in proportions according to weight percent: 9-10% of acetic acid, 5-7% of formic acid, 2%-3% of bifluorid acid ammonium, 2%-4% of boric acid, 1.0-2.0% of corrosion inhibitor, 2.0-4.0% of mutual solvent, 2.0% of clay stabilizer, 0.5-1.0% of dewetting active agent and 67.0-76.5% of water. The active mixed acid plugging removal solution applicable to the low permeability reservoir can delay the reaction rate of acid rock, increase the effective operating distance of acid solution, and realize the acidification of deep formation, and simultaneously can improve the oil and water seepage characteristics and increase the water phase permeability.

The invention provides environment-friendly acidizing working fluid suitable for low-permeability coalbed methane reservoir stimulation, and belongs to the technical field of coalbed methane development. The environment-friendly acidizing working fluid is composed of organic acid, a chelating agent, an anti-swelling agent and a corrosion inhibitor, and every 100 parts of water includes the following components in parts by mass: 7-9 parts of organic acid, 4-5 parts of the chelating agent, 4 parts of the anti-swelling agent and 0.5-1 part of the corrosion inhibitor; and the organic acid is composed of formic acid and citric acid, the chelating agent is composed of glutamic acid N,N-oxalic acid (GLDA) and N-beta-hydroxy ethyl ethylenediamine triacetic acid (HEDTA), and the anti-swelling agentis composed of potassium chloride and ammonium chloride. The environment-friendly acidizing working fluid has the good corrosion effect on crystalline minerals in coal rock, can increase the crack width and porosity of the coal rock, and thus increase the gasometry permeability; and meanwhile, the corrosivity of the environment-friendly acidizing working fluid to pipes is low, pollution to coal mine groundwater cannot be caused, the quality of coal products produced in the later period cannot be affected, and the environment-friendly acidizing working fluid has good application prospects in low permeability coalbed methane reservoir stimulation.

The invention relates to a wrapped profile control degradation agent, which is composed of the following components by weight: 1% of an oleophylic surfactant, 0.5% of a hydrophilic surfactant, 0.01% of a stabilizer, 0.2% of a synergistic agent, 5% of a degradation agent, 60% of an organic solvent, and 33.29% of an inorganic solvent. The profile control degradation agent is prepared according to the safety performance, stability and retardation principles of profile control degradation agents, and brings the coordinating effect of all substances into fully play. By slow release of the degradation agent, and prolonging of the contact time with a profile control agent and the effective time, the purpose of retardation can be reached. The wrapped profile control degradation agent system has the characteristics of complete degradation of polymers and retardation rate up to 80%. At the same time, being a liquid, the system has the advantages of good deformation performance, no blockage to the reservoir pore throat, no corrosion on tubular columns and good corrosion resistance, and is suitable for removing deep blockage of a oil-water well profile control agent crosslinked polymer. The process is simple, and the construction is safe.

The invention relates to slowly-sinking puffed compound feed for misgurnus anguillicaudatus and a production process thereof, and belongs to the technical field of misgurnus anguillicaudatus feed. The feed comprises 5-10 parts of fish meal, 3-10 parts of pork meal, 10-25 parts of bean meal, 3-8 parts of peanut meal, 5-15 parts of cottonseed meal, 5-20 parts of rapeseed meal, 3-10 parts of corn DDGS, 5-15 parts of rice bran, 15-20 parts of flour, 2-4 parts of soybean oil, 1-3 parts of monocalcium phosphate, 2-5 parts of bentonite, 0.2-1.5 parts of vitamin premix, 1-3 parts of microelement premix, 0.05-0.5 part of choline chloride, 0.05-0.1 part of antioxidant and 0.05-0.1 part of mould inhibitor. The utilization rate of the slowly-sinking puffed compound feed is increased for the misgurnus anguillicaudatus, healthy growth of the misgurnus anguillicaudatus is promoted, and pollution of remnant feed and metabolic waste to aquatic water is reduced. The volume weight of the produced slowly-sinking puffed compound feed is kept between that of granular feed and that of puffed feed, the feed has the characteristic of sinking slowly in water like the granular feed and further has the advantage of being long in water resisting time like the puffed feed, and therefore the feed meets the feeding characteristics of misgurnus anguillicaudatus.

The invention relates to a turning foamed acid for heterogeneous reservoir acidification. The turning foamed acid comprises, by volume, a nitrogen gas phase, 10% of hydrochloric acid, 1.5-3% of hydrofluoric acid, 2WT-60A, 2% of a corrosion inhibitor and 0.5% of citric acid. The 2WT-60A is cocoalkanoylamido propyl betaine or dodecyl dimethyl betaine. After the turning foamed acid is stirred at a stirring rate of 1000r / min for 1min, a foam half-life period is about 91min and form mass is 61.5% of the original mass. The turning foamed acid has the characteristic of self-tackifying, is free of a cross-linking agent and a gel breaker, controls a self-turning function based on a pH value, and has good diffluence performances, good retardance and high flowback performances.

The invention aims to provide a clean steering acid fluid system with relatively low cost and high temperature resistance and high pressure resistance. In order to solve the technical problem, the clean steering acid fluid system is realized through the following technical scheme: the clean steering acid fluid system containing an erucyl alkyl quaternary ammonium salt surfactant comprises the erucyl alkyl quaternary ammonium salt surfactant, an acid fluid consisting of at least one inorganic acid or organic acid, a ferrous stability and a corrosion inhibitor. The erucyl alkyl quaternary ammonium salt surfactant is a surfactant with low molecular viscoelasticity, is free of residue or formation of filter cake, and is little in pollution to stratum, and the flow conductivity of cracks can be effectively improved. A gel breaker (for gel breaking when encountering oil or water) is not needed, the gel breaking is thorough, and residual liquid is extremely easy to discharge. The friction drag is low and is just 30% to 40% of water, the construction displacement selectivity range is large, and the requirement of different technology improvements can be realized. The system has good de-filtration characteristic and retarding performance, and the lengths of acid etching cracks can be greatly increased.

The invention discloses a double-acting retarder, which comprises a frame, a speed changer and a transmission shaft, and the double-acting retarder is characterized in that an output shaft of a speed changing box is connected with a cam and a brake disc body, two sides of the cam and the brake disc body are respectively and symmetrically provided with a plunger pump, the plunger pumps are connected with a heat radiating oil tank through an oil inlet pipe with a one-way valve A, the oil inlet pipe is connected with a one-way valve B through a tee joint, the other end of the one-way valve B is connected with a brake device through an oil outlet pipe, the oil outlet pipe is also connected with a throttling valve through a tee joint, the throttling valve is connected with the heat radiation oil tank through an oil return pipe, the outer side of each plunger pump is wrapped by a brake slide groove, a thrusting air chamber is arranged between the bottom end of each plunger pump and the brake slide groove, the front end of each plunger pump is provided with a guide wheel, the guide wheel is matched with the came and the brake disc body, the thrusting air chamber is connected with an air storage tank through a retarding switch, and both the retarding switch and the throttling valve are connected with a control unit.

The invention relates to a gelling agent for gelled acid system and preparation and application thereof. The gelling agent is a copolymer of three monomers, i.e., acryloyloxyethyl trimethyl ammonium chloride, acrylamide and 2-acrylamide-2-methyl propyl sulfonate, and has a molecular weight of 8000000-15000000 Dalton, and as to ratios of the three monomers, a molar ratio of the acrylamide to the 2-acrylamide-2-methyl propyl sulfonate is (0.20-96.75):1, and a molar ratio of the acryloyloxyethyl trimethyl ammonium chloride to the 2-acrylamide-2-methyl propyl sulfonate is (7.40-201.21):1. The gelling agent prepared herein and the gelled acid system have good temperature tolerance, good retardancy and good corrosion inhibition and are applicable to reforming of deep-well high-temperature reservoirs.

The invention relates to an engine retarder which comprises a tappet, a cam, a push rod, a guide pipe, an air valve and an air valve rocker. The cam is arranged below the tappet and used for driving the tappet to move up and down, the push rod is vertically arranged on the tappet, the guide pipe is arranged on a cylinder cover, the air valve is arranged in the guide pipe in a sliding mode, and the air valve rocker is arranged in a rotating mode through a rotating shaft. One end of the air valve rocker is connected with the top end of the push rod in a rotatable mode, and the other end of the air valve rocker is arranged above the air valve. A spring seat is arranged on the upper portion of the air valve, an air valve spring is inserted in the air valve, and two ends of the air valve spring are respectively clamped between the spring seat and the guide pipe. The engine retarder further comprises a pressing device which presses down the air valve rocker when the cam rotates to an interval angle area. After the air valve is opened, and when the pressing device makes the air valve to return, the air valve is blocked by the air valve rocker and can not be closed completely, a throttle clearance is formed, and the retardance effect is achieved. Moreover, the rotation angle of the supporting cam can be automatically adjusted according to the rotation speed of an engine, so that the purpose that a good retardance function exists at any rotation speed is achieved.

The invention relates to an acidation blocking remover and a preparation method of the acidation blocking remover. The acidation blocking remover contains 20-30 percent of main acid liquor, 0.1-0.3 percent of inhibitor, 2-4 percent of clay stabilizer, 0.3-0.5 percent of cleanup additive, 0.05-0.1 percent of demulsifier and the balance of solvent by weight percent. The invention further provides a preparation method for the acidation blocking remover. The acidation blocking remover can improve the processing radius and corrosion effect of a blocking remover, and is suitable for blockage removal of an oil-water well.

The invention provides a high-temperature sandstone oil reservoir retarded acid and a preparation method thereof. The high-temperature sandstone oil reservoir retarded acid is composed of the raw materials of cyclodextrin, sulfonic acid and ammonium fluoride with a molar ratio of 1:1-2:2-8, the balance being water. The preparation method comprises the following steps: a, recrystallized and fully dried cyclodextrin is placed in a mortar; a proper amount of a solvent is added, and the mixture is stirred into a paste; b, sulfonic acid powder is added into the paste obtained in the step a, and the mixture is ground for 1-2h, such that a uniform viscos paste is obtained; the paste is subjected to constant-temperature drying for 8-12h under a temperature of 50 DEG C in a baking oven, such that a white powdery substance is obtained, wherein the substance is a clathrate of cyclodextrin and sulfonic acid; and c, ammonium fluoride is mixed with the clathrate obtained in the step b, such that the high-temperature sandstone oil reservoir retarded acid is obtained. Compared to existing retarded acids, the high-temperature sandstone oil reservoir retarded acid provided by the invention has the characteristics of high-temperature resistance, good retardance and high corrosion capacity.

The invention provides an erucic acid-based alkyl quaternary ammonium surfactant and a preparation method thereof. The invention aims to solve the problems of reducing sand-carrying capability and reducing performance caused by quick reducing colloidal viscosity under high temperature and high shearing rate of the present quaternary ammonium surfactant used as a main agent of a clean fracturing fluid. The structural formula (I) of the erucic acid-based alkyl quaternary ammonium surfactant is as shown in the specification. The preparation method for the erucic acid-based alkyl quaternary ammonium surfactant comprises the steps of compounding erucyl amide and compounding the erucic acid-based alkyl quaternary ammonium surfactant in turn. The invention can solve the problems of reducing sand-carrying capacity and reducing performance caused by quick reducing colloidal viscosity under high temperature and high shearing rate of the present quaternary ammonium surfactant used as the main agent of the clean fracturing fluid.

The invention discloses a retarded acid system. The retarded acid system comprises alkyltrimethylammonium chloride and a water-soluble calcium salt; and the alkyl group is a long-chain alkyl group containing 8-22 carbon atoms. The retarded acid system further comprises 1% of a corrosion inhibitor Mannich base and 1% of an iron ion stabilizer. In practical application, the use amount of the alkyltrimethylammonium chloride is 0.12-0.95 mass%, and the dosage concentration of the calcium salt is 10-100 mmol / L. The alkyltrimethylammonium chloride acts on a rock surface through physical adsorption,and covers the rock surface to perform hydrophobic wetting modification on the rock surface, so that hydrophilic H<+> is not prone to contact the rock surface, the reaction surface rate is controlled,and the acid rock reaction time is prolonged, thereby the retarding effect is achieved. The retarded acid has the advantages of low molecular weight, small damages to stratums, low viscosity, and improvement of the construction effect by cracking the complexity of crack networks through uneven etching of the wall surfaces of small cracks after entering the small cracks.

The invention discloses a graded retarded cross-linked emulsified acid which comprises a cross-linked acid and an emulsified acid, wherein the content of the cross-linking acid is 50-80 parts by volume, preferably 55-75 parts by volume, the content of the emulsified acid is 20-50 parts by volume, preferably 25-45 parts by volume, the cross-linking acid comprises a cross-linking acid base solutionand a cross-linking agent, the content of the cross-linking acid base solution in the cross-linking acid is 94.8 to 107 parts by weight, preferably 101.5 to 104.5 parts by weight, the content of the cross-linking agent is 0.6 to 1.5 parts by weight, preferably 0.8 to 1.2 parts by weight, the emulsified acid comprises an oil phase and an acid phase, the content of the oil phase is 20-40 parts by volume, preferably 25-35 parts by volume, and the content of the acid phase is 60-80 parts by volume, preferably 65-75 parts by volume. The graded retarded cross-linked emulsified acid is a novel acid liquid system, has the advantages of high apparent viscosity, low filtration loss, good temperature stability, good retarding effect and the like, meets the acid fracturing application of high-temperature reservoirs, and is simple in preparation method and worthy of popularization and application.

The invention discloses a preparation method of a cationic polymer acid solution retarding agent. Methacryloyloxyethyl trimethyl ammonium chloride, allyl polyethylene glycol and hexadecyl dimethyl allyl ammonium chloride are used as raw materials, a nano silicon dioxide / cellulose composite material is introduced to prepare the cationic polymer acid solution retarding agent by virtue of a water solution polymerization, ultrasonic treatment and physical compounding method. The acid solution retarding agent prepared in the invention has good effect for lowering the reaction rate of acidic rock, and still has good retarding effect under the condition of 90 DEG C and 5000 mg / l NaCl.

The invention discloses a nanometer foam acid, and belongs to the technical field of slow acidification of oil and gas wells. The nanometer foam acid includes, by mass, 0.1-1.0% of long-chain imidazoliniumbetaine, 0.1-2.0% of hydrophilic nano-silica, 0.5-2.0% of a corrosion inhibitor, 0.1-1.0% of an iron ion stabilizer, 30-50% of concentrated hydrochloric acid, and the balance of water. The nanometer foam acid can effectively reduce the speed of an acid-rock reaction, increase an acidification penetration distance and realize uniform acid distribution to achieve the purpose of deep acidification, and can effectively reduce the leak-off of an acid solution and avoid damages to an oil reservoir. A preparation method of the nanometer foam acid includes the following steps: adding water and concentrated hydrochloric acid into a container, then adding the long-chain imidazoliniumbetaine, hydrophilic nano-silica, the corrosion inhibitor and the iron ion stabilizer, and performing uniform stirring to obtain the nanometer foam acid. The preparation method is simple, and raw materials used in the preparation method are easy to obtain. An application method of the nanometer foam acid is characterized in that when the foam acid is used, nitrogen is introduced to the foam acid, the foam acid is stirred and foam, and the foamed foam acid is constructed. The application method is simple to operate, and the foam acid is convenient to use.

The invention provides a liquid wormhole acid system, which is composed of the following substances in percentage by weight: 10 to 25% of organic acid, 1 to 5% of clay stabilizing agent, 15 to 20% of polyglucoheptonate, 1 to 5% of surfactant, and the balance being water. The provided liquid wormhole acid system has a good retarding performance. The used organic acid is a polyatomic acid. The H<+> ionization speed is slow, thus the H<+> concentration is low, the acid-rock reaction speed is reduced from the source, the deep penetration of liquid acid is realized, a longer distance of useful effect is formed, and the flow conductivity is enhanced.

The invention discloses a high-temperature resisting leakproof type unfreezing acid for well drilling and a preparation method thereof and belongs to the technical field of well drilling. The unfreezing acid comprises the following components in parts by weight: 12-50 parts of hydrochloric acid, 30-70 parts of diesel oil, 0.3-0.7 part of ferrous stabilizer, 1.5-4.2 parts of emulsifying agent, 0.3-2.1 parts of corrosion inhibitor, 0.9-2.1 parts of surfactants, 0.9-2.1 parts of temporary plugging agents and 7-35 parts of water. The preparation method for the unfreezing acid comprises the following steps: successively adding 7-35 parts of water, 1.5-4.2 parts of corrosion inhibitor, 12-50 parts of industrial hydrochloric acid, 0.3-0.7 part of ferrous stabilizer, 0.9-2.1 parts of surfactants,1.5-4.2 parts of emulsifying agent, 0.9-2.1 parts of temporary plugging agents and 30-70 parts of diesel oil into an acid mixing tank, and then stirring for 30 minutes in the acid mixing tank, therebyacquiring the unfreezing acid. The unfreezing acid is a stable emulsion which is formed by an oil phase and acid liquor under the effect of emulsifying agent, and has higher viscosity, better retarding property and demulsification property. The unfreezing with the unfreezing acid has the characteristics of short time, quick effect and high success rate.

A retardant is provided. The retardant is prepared through steps of A) subjecting formaldehyde, an amine and phosphoric acid to a Mannich reaction to obtain a monomer, and B) copolymerizing the monomer and acrylic acid to obtain the retardant. The retardant is prepared through copolymerizing the monomers. One molecular chain of the retardant after the polymerization contains a plurality of releasable Hs and the Hs can be slowly released in stratums, thus achieving an effect of acidifying the stratums and improving stratum corrosion capability of the admixture. The invention also provides a retardant acid working solution comprising the retardant. Test results prove that the retardant acid working solution has good slow release effects, and is turned into a spent acid after 30-90 min.

The invention relates to a hydrophobic associated matter and a preparation method thereof, and a clean diverting acid for fracturing acidizing of a heterogeneous carbonate reservoir, and a preparationmethod thereof, and belongs to the technical field of oilfield chemical industry, wherein the hydrophobic associated matter has a structure represented by a formula (1) x:y is 90-95:5-10, and the hydrophobic associated matter has a weight average molecular weight of 800000-1200000. The preparation method comprises: uniformly mixing 13-17 parts by weight of acrylamide, 7-8 parts by weight of sodium 4-Heptadecafluorononenyloxybenzenesulphonate and water, adjusting the pH value to 6-7, adding 0.04-0.05 part of a redox initiator, and carrying out a reaction for 5-7 h at a temperature of 30-40 DEGC under inert gas protection. According to the present invention, the hydrophobic associated matter as the diverting agent of the clean diverting acid system has the hydrophobic group and the fluorocarbon group, such that the viscosity and the retarding performance of the acid liquid system at the high temperature are improved so as to meet the deep penetration requirements of fracturing acidizing construction.

The invention discloses a cross-linked emulsified acid, a preparation method and applications thereof. The cross-linked emulsified acid comprises a cross-linked acid base solution, an oil phase and across-linking agent, wherein based on the total volume of the cross-linking acid base solution and the oil phase of 100 parts, the cross-linking agent is 0.6-1.5 parts, the oil phase is one or a combination of diesel oil, kerosene, white oil and light crude oil, and the cross-linking agent is an organic zirconium cross-linking agent, an organic aluminum cross-linking agent or an organic titanium cross-linking agent. The preparation method comprises the following steps: slowly adding the oil phase into the cross-linked acid base solution according to the dosage, continuously stirring to uniformly mix the oil phase and the cross-linked acid base solution to form a uniform emulsion, and adding the cross-linking agent to obtain the cross-linked emulsified acid. Compared with the conventional ground cross-linked acid system, the cross-linked emulsified acid of the invention has the characteristics of good retarding performance, stability, temperature resistance and the like, and has a goodacid fracturing / acidifying effect after being injected into a stratum.

The invention discloses a dually retarded emulsified self-generated acid and a preparation method thereof. The emulsified self-generated acid comprises the following components in parts by volume: 60-80 parts of self-generated acid and 20-40 parts of an oil phase, wherein the oil phase contains 3-5 parts by weight of an emulsifier based on 100 parts by weight of the total amount of the oil phase.The preparation method comprises the following steps: dropwise adding the oil phase into the self-generated acid according to the usage amount under high-speed stirring of 1000r / min-3000r / min, and carrying out stirring for 10-30min to form a uniform emulsion to prepare the dually retarded emulsified self-generated acid. An emulsion of the emulsified self-generated acid provided by the invention combines advantages of self-generated acids and emulsified acids, has good stability at 200 DEG C, can meet the requirements of acid pressing / acidifying construction of an ultra-high temperature carbonate reservoir, and has a good popularization and application prospect.

The invention relates to the technical field of elevators, and discloses an elevator with multiple safety protection functions. The elevator comprises an elevator body, an elevator protection mechanism, a passenger protection mechanism and an elevator indication mechanism. The elevator protection mechanism is arranged on the elevator body, and the passenger protection mechanism and the elevator indication mechanism are both arranged on the elevator protection mechanism. The left side and the right side of the top face of the elevator body are each provided with two sliding grooves, and the surfaces, close to the center of the elevator body, of the sliding grooves are fixedly connected with springs A. By arranging the elevator protection mechanism, the safety of the elevator can be automatically judged according to the rotating speed of the elevator, and when the elevator falls, the elevator protection mechanism can be automatically and rapidly started to operate. Two attaching plates are used for being tightly attached to the walls on the two sides of the elevator, the falling speed of the elevator is reduced through friction force, the elevator is prevented from falling to the ground at a high speed to cause harm to passengers, the elevator is straightened through thrust on the two sides, and the problem that the passengers are collided due to shaking of the elevator is avoided.

The invention belongs to the technical field of aquatic feed, and particularly relates to micro-particle slow-sinking fish fry feed and a production method thereof. The feed has the advantages that the nutrition proportion is reasonable and sufficient, all nutrition requirements of fry in the early growth stage can be met, the slow-sinking effect is good, and the relatively long feeding time and relatively weak feeding capacity of juvenile fish are met. In addition, a circulation box type drying machine used in the processing method structurally comprises an outer side cuboid box, a rectangular pipe, a drying carrying conveying belt, a box body door, a rectangular ring block, an electric heating wire heater, a filtering exhaust unit, a hot air opening, an air inlet pipe, a cold air openingand an air blower. The circulation box type drying machine has the advantages that the heat utilization rate can be greatly improved through two circulating drying air circulations, the amount of fresh air supplemented from the outside and the exhaust gas discharge amount are flexible and adjustable, dust in feed particles can be taken away and recycled, and the equipment is reasonable and effective in structure, compact, stable and good in drying and using effect.

The invention discloses a composite blocking remover and a method for removing blockage of a compact sandstone reservoir pressing crack commissioning horizontal well in a composite manner. The composite blocking remover comprises a preposition liquid, a main treating fluid, an active blocking remover and a subsequent fluid. The preposition liquid is composed of organic acid, inorganic acid, a stabilizer, an oxidizing agent, a chelating agent, a corrosion inhibitor, polyol ether and water. The main treating fluid is composed of organic acid, inorganic acid, the stabilizer, the oxidizing agent, a fluorine carbon surfactant and water. The active blocking remover is composed of a zwitterionic surfactant, the stabilizer and water. The subsequent fluid is water. The composite blocking remover can remove the blockage of routine colloid, asphalt mass and inorganic solid phase particles, and can remove the damage of water blocking and crude oil emulsification by pertinency, and has the advantages of good slow performance, effectively preventing secondary deposition pollution such as the iron ion deposition and acid sludge generation, the horizontal well near-well and deep reservoir pollution can be effectively released, the oil well production power is recovered, and the recovery efficiency can be greatly increased.