67 results about "Wax removal" patented technology

A wax melter apparatus. The wax melter apparatus includes a housing and a heating element to provide heat to melt wax. The wax melter apparatus also includes a flexible dish supported by the housing, the flexible dish receives the wax to be melted and can be distorted to allow cooled and hardened wax to be easily removed.

The present invention relates to a CMP process for reducing the incidence of polishing fog on silicon wafers, including processes of wax coating and attachment, rough polishing, medium polishing, fine polishing, stripping, and dewaxing and cleaning. By adjusting process conditions such as polishing pressure, medium and fine polishing time, and polishing liquid flow rate during different cloth times of the polishing cloth, the insufficient ability to repair the damaged layer in the middle and late stages of the cloth time is compensated: the medium and fine polishing cloth times are both 80h. Before 50h of the cloth time, the consistent CMP process is adopted: the medium polishing pressure is 2.2 - 2.4 kg / cm<supgt;2< / supgt>, the medium polishing liquid flow rate is 1.9 - 2.1 L / min, the fine polishing liquid flow rate is 0.4 - 0.6 L / min, the medium polishing time is 8 - 12 min, the fine polishing time is 7 - 9 min, and the rotational speeds of the polishing head and the platen are 35 - 45 rpm; after 50h of the cloth time, the medium polishing pressure is increased to 2.5 - 2.7 kg / cm<supgt;2< / supgt>, the medium polishing liquid flow rate is increased to 2.4 - 2.6 L / min, the fine polishing liquid flow rate is increased to 0.7 - 0.9 L / min, the medium polishing time is extended to 15 - 17 min, the fine polishing time is extended to 9 - 11 min, the rotational speeds of the rough polishing head and the platen are 55 - 65 rpm, and the rotational speeds of the medium and fine polishing heads and the platen are 35 - 45 rpm. By improvement, the incidence of polishing fog is reduced, and high polishing quality is maintained throughout the entire cloth time cycle without reducing the service life of the polishing cloth.

The present application belongs to the technical field of oil well wax removal and prevention, and relates to a shale oil well shaft wax removal and prevention agent and a preparation method thereof. The shale oil well shaft wax removal and prevention agent comprises the following raw materials in percentage by mass: 40-55% of an oily solvent, 1-3% of a cosolvent, 1-2% of an imidazole double-trifluoromethylsulfonylimide salt, 10-20% of a wax crystal modifier, 3-5% of an emulsifier, 1-2% of an alkaline adjusting agent, and 25-35% of water, with the sum of the percentage by mass of each raw material being 100%; the wax crystal modifier is prepared by copolymerizing (methyl) acrylic C12-C16 ester, (methyl) acrylic C1-C3 ester and (methyl) acryloyl chloride, and then reacting with C20-C30 alkyl alcohol. The wax crystal modifier in the present application has long-mid-short branched chains, and cooperates with the imidazole double-trifluoromethylsulfonylimide salt to improve the wax removal effect and low-temperature fluidity, thereby achieving high-efficiency wax removal and prevention effect and still maintaining good wax removal and prevention effect at low temperatures.

The application discloses a cleaning method of a silicon carbide substrate. The method comprises the following steps: firstly, removing the polishing liquid, strongly adsorbed substances and large particles remaining on the surface of a ceramic disc and the silicon carbide substrate by adopting a hydrogen peroxide ultrasonic immersion method; then, immersing the ceramic disc and the silicon carbide substrate in isopropyl alcohol to dissolve the wax on the surface and the edge, remove the surface wax, and reduce the adsorption of the wax between the silicon carbide substrate and the ceramic disc; further, the method is beneficial to realize wafering at low temperature, avoid high-temperature wax dry setting, and increase the cleaning difficulty; then, the wax is removed by immersing the ceramic disc and the silicon carbide substrate in isopropyl alcohol again; finally, the two-step wax removal cleaning process and the ultrasonic cleaning process of super-pure water are adopted to realize the purpose of removing the residual substances without dead angle; in addition, the service life of the wax removal cleaning liquid is effectively prolonged, and the generation amount of the cleaning waste liquid is reduced, so that the application discloses a high-efficiency, green and environment-friendly cleaning method of the silicon carbide substrate.

The invention belongs to the technical field of oil exploitation, and particularly provides an oil nozzle sleeve wax removing device and method.The oil nozzle sleeve wax removing device comprises a gun head, a lead screw, a connecting rod, a crank, a gear set, a rotating handle, a connecting fixing plate and a fixed positioning sleeve, the right end of the connecting rod is connected with the left end of the lead screw, the right end of the lead screw is connected with the gun head, and the lead screw is sleeved with the fixed positioning sleeve; the other end of the crank, the left portion of the connecting fixing plate and the gear set are sequentially connected from back to front, the rotating handle is connected with the gear set, and the right end of the connecting fixing plate is connected with the fixing positioning sleeve. The problems that in the paraffin removal operation process of an oil nozzle sleeve on an existing oil extraction site, a paraffin block structure of the oil nozzle sleeve is difficult to damage through a screwdriver or a crow bar or other tools, paraffin extraction is difficult, time-consuming and labor-consuming, and oil well production is affected are solved. Single-well wax removal operation can be achieved by one person without a power source, the labor intensity is reduced, the working efficiency is high, and the operation cost is saved.

The invention discloses an anti-waxing electric heating carbon fiber continuous sucker rod, belongs to the technical field of sucker rods, and aims to solve the problems that the sucker rod is heated by only depending on a heating cable to prevent wax precipitation of crude oil, such as power supply failure and insufficient power of the cable, a deposited wax layer can be hardened, so that softening is difficult in subsequent heating, extra hot washing or mechanical wax removal is needed, and the service life of the sucker rod is shortened. In order to solve the problems that an existing sucker rod is not provided with a heating cable, the heating cable only can prevent wax and cannot deal with scaling on the surface of the sucker rod, the invention comprises a sucker rod main body and a linkage mechanism, and the linkage mechanism used for automatic scraping is arranged in the middle of the inner side of the sucker rod main body. The outer surfaces of a bottom oil rod and a connecting oil rod can be scraped and cleaned through rotation of the scraper, the possibility of crude oil wax precipitation can be greatly reduced through cooperation of the scraper and heating of a heating cable on a sucker rod body, shutdown or additional operation is not needed, wax removal during operation is achieved, the device adapts to the working condition of continuous crude oil wax precipitation, the temperature influence is avoided, and the service life of the device is prolonged. The wax removal stability can be ensured.

The present invention is directed to a device comprising a fabric substrate layer having a dividing line horizontal to the length of the fabric substrate layer that divides a first part coated with a skin-safe adhesive layer on one side and a second part that is not covered by the skin-safe adhesive layer; and methods of application therefrom.

The application discloses a self-cleaning crude oil wax removal filter system and belongs to the technical field of crude oil conveying and filtering. The system comprises a filter structure installed on a crude oil conveying pipeline. The filter structure comprises a plurality of groups of parallel filter pipe groups. Each group of filter pipe groups is composed of a communication pipe, a filter with an embedded filter screen, a pressure transmitter, a control valve group, a backwashing unit and / or a heating unit, and a control unit. The control unit determines the working condition based on the pressure conveying standard. If the pressure is qualified, the operation is maintained. If the pressure is unqualified, the control valve group is closed, the blowdown valve is opened, and the backwashing unit and the heating unit are started, so that the self-cleaning operation of the inside of the filter pipe group is realized. The application realizes intelligent self-cleaning, guarantees the continuity of crude oil conveying, improves the wax removal filtering efficiency, is suitable for various conveying scenes of waxy crude oil, and can solve the problems of manual cleaning, discontinuous conveying and poor wax removal effect of the traditional filter system.

The utility model belongs to the technical field of oilfield development, and particularly relates to a paraffin removal-free sucker rod which comprises a sucker rod body, and a wax collecting and conveying device is arranged on the circumferential surface of the sucker rod body. The wax collecting and conveying device comprises a collecting blade used for collecting and conveying wax and a connecting base used for connecting the sucker rod body and the collecting blade, the connecting base is fixedly arranged on the sucker rod body, and the collecting blade is hinged to the connecting base. The sucker rod is simple in structure and convenient to use, by means of the collecting blade and the connecting base which are arranged on the sucker rod body, when the sucker rod body vertically downwards stretches into an oil well, the collecting blade is contracted and abuts against the sucker rod body, and when the sucker rod body vertically upwards moves towards an oil well opening, the collecting blade is unfolded, and the collecting blade is unfolded. And the collecting blade and the sucker rod body form a collecting area sunken towards the bottom of an oil well, so that wax is collected and conveyed in one direction, and wax removal and prevention are effectively achieved.

Disclosed in the present invention are a wax removal and inhibition agent, and a preparation method therefor. The wax removal and inhibition agent comprises an alkyl acrylamide-imide-quaternary ammonium salt polymer, and the polymer comprises a structural unit as represented by formula I, a structural unit as represented by formula II and a structural unit as represented by formula III, wherein R1 is selected from a hydrogen atom or an alkyl; R2 is selected from a group containing a quaternary ammonium salt; R3 is selected from a hydrogen atom or an alkyl; R4 is selected from an alkyl; R5 is selected from a hydrogen atom or an alkyl; and R6 is selected from a group containing an imide structure as represented by formula IV: formula IV. The wax removal and inhibition agent of the present invention has both good wax removal and wax inhibition effects.

A well treatment composition wax removal additives for the cleaning of a well containing hydrocarbons waxes. The wax removal additives comprise nano polysaccharides. A method of cleaning a hydrocarbon well containing at least one of wax, asphaltenes or scale, by injecting a nano polysaccharide solution.

The utility model discloses a multifunctional wax repairing instrument which comprises a wax repairing instrument body, a heating module is installed at the top end of the wax repairing instrument body, a heating plate which is obliquely placed is connected to the heating module, the side wall of the front end of the heating plate is located below the side wall of the rear end of the heating plate, side plates are connected to the side walls of the two sides of the heating plate, and the side plates are connected to the side walls of the side plates. A partition plate is connected to the middle of the top end of the heating plate, a driving structure is arranged on the side plate, a limiting supporting structure is arranged on the heating plate, and a storage structure is installed on the side wall of the front end of the heating plate. A new wax block is placed between the movable plate and the side plate, the movable plate and the side plate clamp the newly-placed wax block, and therefore the effect of uninterruptedly placing the wax block for wax removal is achieved, the wax removal efficiency is improved, meanwhile, the side plate, the movable plate, the partition plate and the heating plate are attached to the three faces of the wax block, the side wall of the wax block is synchronously heated in a multi-angle mode, and the wax removal efficiency is improved. Therefore, the wax removal efficiency of the wax block is improved.

According to the dynamic paraffin removal and inhibition experiment device, the container and a paraffin removal and inhibition agent in the container can rotate around the rotating axis by arranging the container on the rotating assembly, the connecting part, connected with the container, in the upper cover of the container rotates along with the container, and the main body part rotationally connected with the connecting part and the paraffin precipitation pipe installed on the main body part are static; the flow state of the paraffin remover and inhibitor in a shaft in production practice is simulated, so that the experimental state of the paraffin remover and inhibitor is matched with the actual use state, and the purpose of improving the accuracy of an indoor experimental evaluation result of the paraffin remover and inhibitor is achieved.

The invention relates to the technical field of oilfield chemistry, in particular to a paraffin removal viscosity reducer for hydraulic jet paraffin removal and a use method thereof, the paraffin removal viscosity reducer for hydraulic jet paraffin removal comprises the following raw materials in percentage by mass: 0.1-0.5% of octadecanol, 5-10% of eicosyl heavy mahogany petroleum sulfonate, 5-20% of ethanol, 1-5% of polyethylene oxide surfactant, 10-20% of betaine surfactant, 0.1-0.2% of hydroxyethyl cellulose and the balance of water. And the paraffin removal viscosity reducer is used for adding a required amount of the paraffin removal viscosity reducer into a working medium to obtain a paraffin removal working solution, the paraffin removal working solution is injected into the light casing oil well in a 10-13MPa hydraulic jet fluid form, and the paraffin deposits on the casing wall of the light casing oil well are cleaned by using the hydraulic jet fluid. The paraffin removal and viscosity reduction agent disclosed by the invention is simple in preparation method, can achieve a synergistic effect with a hydraulic jet fluid technology, and can maintain efficient paraffin removal and viscosity reduction performance in a high-salinity and high-specific-gravity slurry or solid-free well killing fluid environment.

The utility model discloses a progressive heating wax removal device, and belongs to the field of heating wax removal devices. A progressive heating wax removal device comprises a water tank, a plurality of splitter plates are fixedly connected to the interior of the water tank and used for dividing the space in the water tank, a plurality of heating wires located on the two sides of the splitter plates are fixedly connected to the bottom of the inner wall of the water tank, and the heating wire on the rightmost side is in a normally-open state and keeps the highest required temperature; the water flow heated by the rightmost heating wire sequentially flows into the space divided by the leftmost splitter plate through the tops of the splitter plates; the heating wire on the rightmost side is normally opened, and the other heating wires are closed, so that the total energy consumption is remarkably reduced, the splitter plate divides the space of the water tank, water flow is forced to overflow from a right high-temperature area to a left low-temperature area, a gradual temperature gradient is formed, and heat waste caused by direct mixing of cold and hot liquid is avoided; impact of frequent start and stop of the heating wire on temperature is reduced, and equipment service life is prolonged.

The application discloses a wax printing method for double-side wax coating, and the method steps comprise the following steps: 1, coating paraffin pattern on the front side of the cloth, the pattern in the middle is in the shape of a pattern, and the outer side is in the shape of a stripe; 2, sticking adhesive tapes on the back side of the cloth except the position opposite to the stripe shape, and coating a layer of microcrystalline wax on the rest part, the position of the microcrystalline wax layer corresponds to the stripe shape on the front side of the cloth; 3, removing the adhesive tapes on the back side of the cloth which have been coated with the microcrystalline wax, and then putting the cloth into a dye vat for immersion dyeing; 4, putting the cloth after the immersion dyeing into boiling water for wax removal; and 5, washing the cloth after the wax removal with clean water, and then cooling and drying to obtain the finished wax printing cloth. Through the wax printing method, the production and processing efficiency is improved, and the cost of the wax printing cloth is greatly reduced. The wax printing cloth processed by the method has clear pattern levels and obvious contrast effect, and the quality is greatly improved, and the effect is very obvious.

The invention relates to the technical field of oil-based wax removal and prevention, and discloses an oil-based wax removal and prevention agent and a preparation method. Xylene has rapid dissolution ability and a large saturated wax dissolving capacity, and can achieve "like dissolves like" for wax. The molecular structure of the polyacrylate pour point depressant and viscosity reducer simultaneously comprises two long-chain lipophilic groups and a sodium sulfonate hydrophilic group. The structure of the lipophilic group is similar to that of paraffin wax, and can form a eutectic with the paraffin wax, thereby inhibiting the continued growth of wax crystals. The hydrophilic group extends outward, hindering the subsequent precipitated paraffin wax from combining with the agent to form a three-dimensional network structure, preventing the wax crystals from adhering to each other, and further exerting the wax prevention and removal effect. The polyacrylate pour point depressant and viscosity reducer has good solubility in crude oil, and its alkyl side chain can fully react with the paraffin wax in the crude oil, thereby changing the structural morphology of the wax crystals, increasing the flow space of the liquid oil, and reducing the flow resistance of the crude oil, thereby exerting the pour point and viscosity reduction effect on the crude oil.

The invention belongs to the technical field of gradient particle size abrasive cloth manufacturing, and particularly relates to a gradient particle size abrasive cloth manufacturing method which comprises the following steps that S1, base material pretreatment is conducted, specifically, a cloth base is used as a main material for raw cloth treatment, the treatment process comprises singeing, dewaxing, dipping, stretching shaping and calendaring, and then gum application or printing is conducted; s2, primer coating is conducted, specifically, primer is roller-coated through a roller coating machine, the primer is one of phenolic aldehyde, epoxy and polyurethane, then low-temperature pre-drying is conducted, and the temperature is kept between 80 DEG C and 120 DEG C; s3, gradient sand planting is conducted, specifically, coarse sand planting and fine sand planting are conducted, the coarse sand planting mode is electrostatic sand planting, large-particle-size abrasive materials are evenly planted on primer, the fine sand planting mode is gluing again, small-particle-size abrasive materials are planted, and a complete gradient is formed; according to the device, the problem that the gluing quality is greatly reduced due to poor gluing uniformity and low smoothness in the gluing process when abrasive cloth with gradient particle sizes is manufactured at present is solved.

The utility model provides a wax removal device and a methanol separation system, the wax removal device comprises a gas supply pipeline and a heat dissipation rod, the gas supply pipeline is provided with a first inlet and a first outlet, and the gas supply pipeline is provided with a valve; the heat dissipation rod is provided with a second inlet and a plurality of second outlets, the second inlet is located at one end of the heat dissipation rod in the length direction and communicated with the first outlet, the second outlets are formed in the peripheral side surface of the heat dissipation rod, and the heat dissipation rod is hollow so that the second inlet can be communicated with the second outlets respectively. And the distances between the at least two second outlets and the second inlet are different. The steam conveying pipeline conveys steam to the second inlet of the heat dissipation rod, then the steam is conveyed to the multiple second outlets through the hollow part of the heat dissipation rod, the multiple second outlets are correspondingly formed in demineralized water in the methanol separator so that the demineralized water can be heated, and then wax in the methanol separator is heated to the melting point to be melted into the demineralized water; and finally, the demineralized water mixed with the wax liquid is discharged, so that the wax removal work of the methanol separator is realized.

The invention relates to the technical field of oil exploitation, in particular to a sucker rod wax collecting device with an ultrasonic wax removal function and a method. The sucker rod wax collecting device comprises a main body, a sucker rod wax collecting assembly is arranged on the side face of the main body, and a control assembly is fixedly connected to the side face of the main body; wax on the surface of the sucker rod can be collected through the wax collecting container, the wax collecting container is of a hollow cylindrical structure, the spiral flow guide groove is formed in the inner wall of the wax collecting container and used for guiding the wax to flow and collecting the wax in a centralized mode, and the sucker rod channel is located in the center of the wax collecting container and used for containing the sucker rod. According to the wax removing device for the sucker rod, the sucker rod can smoothly pass in the up-and-down movement process, wax dirt on the surface of the sucker rod is oscillated through high-frequency ultrasonic waves generated by the ultrasonic generator to be loosened and fall off, the wax dirt on the surface of the sucker rod can be rapidly and effectively removed through the synergistic effect of high-frequency oscillation of the ultrasonic waves and the heater, and the wax removing efficiency is improved.

The invention belongs to the technical field of precision casting, and provides a high-strength pouring gate rod which comprises a heat conduction mold core and a wax layer wrapping the outer side of the heat conduction mold core. And during dewaxing, the wax layer is firstly melted, so that a dewaxing channel is formed between the heat conduction mold core and the mold shell. According to the high-strength pouring gate rod, the composite structure of the heat conduction mold core and the wax layer is arranged, the problem that a traditional solid pouring gate rod is large in wax consumption is firstly solved, a large amount of wax materials are replaced with the heat conduction mold core, and wax material consumption is reduced; secondly, due to the high-strength characteristic of the heat conduction mold core, the defect that a traditional wax pouring gate rod is poor in strength is overcome, and the pouring gate rod is prevented from being deformed or damaged in the tree assembling process; meanwhile, the heat conduction mold core has good heat conductivity and can accelerate heating melting of a wax layer, a wax discharging channel formed after the wax layer is molten can enable wax liquid to be rapidly discharged, the problems that due to the fact that a traditional solid pouring gate rod is large in overall thickness and dewaxing is late, the wax liquid is retained, and extrusion force is generated on a mold shell are solved, and the cracking risk of the mold shell is effectively reduced.

The present application relates to a kind of precision micro stepping motor wax removal methods, comprising the following steps: 1) after organic solvent water bath is heated to constant temperature, stator is immersed in organic solvent ≥30min;2) take new organic solvent water bath and heat to constant temperature, use circulating pump to flush the inner hole of stator, and each stator flushing time ≥1min;3) using anhydrous ethanol along the inner hole of stator axial reciprocating wash ≥20 times, then room temperature is placed ≥10min;4) stator is placed into high-low temperature test chamber and is treated at high-low temperature, first at high temperature and is kept ≥20min, then temperature is changed to low temperature and is kept ≥10min, repeat high-low temperature treatment at least 4 times, low temperature recovers to normal temperature and is taken out;5) repeat step 1) to step 3) or step 2) to step 3);The present application improves the effect of paraffin wax cleaning under the stator winding structure, improves production efficiency, and reduces the amount of solvent used.

The utility model discloses a wax printing double-face cloth feeding washing device which comprises a washing box, the bottom of the washing box is connected with a heating plate, two cleaning rollers are rotatably connected in the washing box in the vertical direction, and cloth guide rollers are rotatably installed on the two sides of the cleaning rollers and the two sides of the upper end face of the washing box. The ends, penetrating out of the washing box shell, of the two cleaning rollers are both connected with main gears, the two main gears are in meshing transmission, and the end shaft of one main gear is connected with a motor. A lead screw is further rotationally installed on the upper end face of the water washing box, the periphery of the lead screw is sleeved with a ball seat, a cross beam strip is fixed to the ball seat, and a filtering scooping net is installed on the side edge of the cross beam strip. According to the cleaning device, the pair of cleaning rollers can rotate reversely at the same speed so that the two faces of cloth can be cleaned at the same time, the cleaning efficiency is higher, meanwhile, the arranged filtering scooping net can move so that part of floating wax floating on the water surface can be cleaned, and therefore the cleaning effect of water washing wax removal is improved.

The device comprises a conical flask and a glass straight-through tube, the lower end of the glass straight-through tube extends into the conical flask, and the upper end of the glass straight-through tube is connected to a conical flask opening through a test tube buckle and a latex plug. The invention also discloses a method for measuring the paraffin removal rate of microorganisms and bacterial liquid, which comprises the following steps: introducing the glass straight-through pipe into a molten wax sample or high-wax-content crude oil, slowly rotating, taking out the glass straight-through pipe after the paraffin or high-wax-content crude oil completely wraps the liquid-immersed straight-through pipe, repeating the operation for 3-5 times to simulate a wax precipitation oil pipe in a shaft, and aging and weighing the treated straight-through pipe; preparing a fermentation culture medium, introducing a straight-through pipe into the fermented culture medium, carrying out shaking table culture, lightly washing a mycoderm adhered to the straight-through pipe with water, placing, and weighing after the surface is dried; and finally, the paraffin removal rate is calculated through weighing data. By accurately calculating the paraffin removal rate, the use of the paraffin remover can be effectively evaluated and optimized, so that the paraffin precipitation phenomenon of an oil well is reduced. This helps to improve the production and production efficiency of an oil well.

The utility model provides an oil well paraffin removal tool, and belongs to the technical field of cleaning. Comprising a shell, a paraffin removal assembly is installed on the shell, the paraffin removal assembly is used for removing paraffin attached to the inner wall of an oil well, the paraffin removal assembly comprises a first rotating rod, the first rotating rod is rotationally arranged on the inner wall of the shell, a plurality of blades are fixedly arranged on the outer side wall of the first rotating rod, and a high-temperature hot melting head is fixedly arranged on the outer side wall of the first rotating rod; a motor is fixedly arranged on the side, away from the blade, of the shell. The output end of the motor is fixed to the first rotating rod. Through the arrangement of the wax removal assembly, after thick wax is broken through cutting of the blade, waste heat of the high-temperature hot melting head can further soften broken wax, and the situation that the broken wax is attached again due to cooling and solidification is avoided; a scraping plate of the paraffin scraping assembly is tightly attached to the well wall through reciprocating motion, thin-layer paraffin left after cutting of a blade can be removed, the paraffin removal rate is increased through the collaborative process of cutting, hot melting and scraping, and repeated paraffin removal operation is reduced.

The utility model relates to the technical field of methods or devices for cleaning well holes or wells, in particular to a cleaning and wax removing device for a gas well shaft. The gas well shaft cleaning and wax removing device comprises a center rod, a wax scraping structure is arranged on the center rod, the wax scraping structure comprises a rotary scraper, and the rotary scraper can move in the axial direction of the center rod and can rotate around the center line of the center rod. Limiting devices are arranged at the two ends of the rotary scraper and used for limiting the moving range of the rotary scraper on the center rod. And at least one scraper spring is arranged between the rotary scraper and the adjacent limiting device at at least one end of the rotary scraper and is used for providing counter-acting force to the rotary scraper when the rotary scraper is blocked. According to the gas well shaft cleaning and wax removing device, the scraper spring is arranged to provide necessary counter-acting force for the wax scraping structure, the wax scraping structure is helped to overcome obstacles when encountering the obstacles in the shaft, and the wax removing efficiency is improved.

A well treatment composition wax removal additives for the cleaning of a well containing hydrocarbons waxes. The wax removal additives comprise nano polysaccharides. A method of cleaning a hydrocarbon well containing at least one of wax, asphaltenes or scale, by injecting a nano polysaccharide solution.

The application discloses a method and device for removing wax in methanol and recovering and enriching the methanol. The device comprises a steam turbine, a compressor, a heat exchanger, a filter, a wax remover and an evaporator. The wax remover comprises three working modes of temperature reduction, low-temperature adsorption and temperature increase for wax removal. The steam turbine is used for compressing refrigerant and reducing the temperature of liquid-phase methanol containing wax, so that the wax is precipitated and adhered to the wax remover. The turbine exhaust steam is used for heating and removing the wax and recovering and enriching the wax. The application plays a positive role in greatly reducing the impurity content in methanol raw materials, reducing the cleaning frequency and the start-stop frequency of various types of equipment and preventing production fluctuation.

The present invention discloses an experimental device and experimental method for dynamic wax deposition or wax removal, which specifically relates to the technical field of oil and gas field development, including an experimental chamber, a displacement module, a controller, a pressure regulating module for regulating the pressure in the experimental chamber, a temperature control device for regulating the temperature in the experimental chamber, and an oil pumping device; the displacement module includes a liquid storage device and a driving device for transporting the substance in the liquid storage device to the experimental chamber; during the wax deposition experiment, a clean wellbore or a clean formation porous medium is placed in the experimental chamber, the liquid storage device stores an oil-water mixture, and the oil pumping device is used to extract the oil-water mixture in the central through hole of the clean wellbore; during the wax removal experiment, a waxed wellbore or a waxed formation porous medium is placed in the experimental chamber, and the liquid storage device stores a wax remover. The present invention can deeply understand the wax deposition rules and influencing factors of wellbores and formation porous media, evaluate the wax removal effects of different wax removers, optimize the oilfield mining process, improve recovery, and reduce costs.

The invention relates to the technical field of semiconductor manufacturing, in particular to a method for improving the dewaxing capability of the back of a silicon wafer, which comprises the following steps of: 1, performing megasonic synergistic chemical pretreatment, and efficiently activating wax residues; pretreatment liquid is prepared, wherein DEA-TMAH-UPW mixed liquid is prepared; in the megasonic process, the silicon wafer is placed in a megasonic groove with the back face facing upwards, heated to a wax melting critical temperature interval and treated for 8-15 min; 2, gradient cleaning is conducted, wax residues and metal impurities are removed, UPW pre-cleaning is conducted, and SC1 deep cleaning is conducted after three-stage overflow groove series cleaning is conducted; removing metal by hydrochloric acid: soaking for 3-8 minutes at normal temperature by adopting 0.5%-3% diluted hydrochloric acid, and removing metal ions such as Fe, Cu and the like through chelation of chloride ions; thirdly, final washing and drying are conducted, and the surface cleanliness is guaranteed; infrared drying is performed after UPW final washing, and water drops on the surface are removed through nitrogen purging before drying, so that water marks are prevented from being formed.