29 results about "Foam drainage" patented technology

The invention provides a method for determining the filling concentration of a foam scrubbing agent in the full life cycle of a shale gas well foam scrubbing process, and relates to the field of gas well drainage gas recovery processes. The influence of high pressure on the using effect of the foam scrubbing agent is considered, a liquid holdup and frictional resistance pressure drop model of the using coefficient of the foam scrubbing agent is introduced, a shaft outflow curve under different foam scrubbing agent concentrations is drawn, the initial filling point of the foam scrubbing agent is determined, and the gas well formation pressure is determined on the basis of the change relation of the gas well formation pressure along with time. And extrapolating to obtain the production time corresponding to different formation pressures, and finally obtaining the change relation of the optimal filling concentration of the foam scrubbing agent along with the corresponding production time under different formation pressures, thereby determining the filling concentration of the foam scrubbing agent in the full life cycle of the gas well. According to the method, the influence of the pressure and the foam scrubbing agent concentration on the shaft pressure drop and the liquid holdup is fully considered, the reasonable filling concentration of the foam scrubbing agent at different production times in the full life cycle of the gas well is determined, and an important theoretical support is provided for optimization of a foam scrubbing agent filling system of a shale gas well foam scrubbing process.

The invention discloses an offshore deep continuous foam liquid drainage gas production process pipe column and an operation method, the pipe column comprises a production sleeve, an oil pipe, a lower suspension packer, an upper suspension packer and a continuous oil pipe, a production packer and a top packer are sequentially arranged between the oil pipe and the production sleeve from top to bottom, the oil pipe is located above the production packer for punching, and the continuous oil pipe is located above the production packer for drilling. The lower suspension packer is arranged below the punching position, the upper suspension packer is arranged above the punching position, the upper suspension packer is connected with the lower suspension packer in a sealed mode through an inserting head, and the lower portion of the lower suspension packer is connected with the coiled tubing. A foam scrubbing agent channel from an oil pipe and sleeve annulus to an oil pipe and continuous oil pipe annulus is established through cooperation of multiple tools, the foam scrubbing agent is introduced into a deep shaft liquid accumulation well section below a production packer and above a production layer from the oil pipe and production sleeve annulus, and the fluid density of a shaft is reduced; the mixed fluid is discharged from the continuous oil pipe and the upper oil pipe, and continuous and stable discharging and mining of the gas well are achieved.

The utility model discloses a defoaming device for gas well foam drainage accumulated liquid, and relates to the technical field of gas well gas recovery, the defoaming device comprises a defoaming cylinder, a first defoaming mechanism, a bearing seat, a second defoaming mechanism, a servo motor and a liquid inlet hose, the outer wall of the defoaming cylinder is respectively provided with a foam inlet pipe and a liquid drainage pipe, the first defoaming mechanism is arranged in the inner cavity of the defoaming cylinder, and the second defoaming mechanism is arranged in the inner cavity of the defoaming cylinder. The bearing seat is fixed at the bottom of the defoaming cylinder, the second defoaming mechanism is mounted at the top of the defoaming cylinder, and the servo motor is mounted at the top of the first defoaming mechanism. Through the arrangement mode that the first defoaming mechanism and the second defoaming mechanism are matched with each other, foam can be naturally ablated by a solid defoaming agent of the first defoaming mechanism, the foam can be extruded towards the first defoaming mechanism by the second defoaming mechanism, the foam can be conveniently crushed, and the foam can be conveniently defoamed by being matched with spraying of a liquid defoaming agent; and the defoaming agent is suitable for defoaming a gas well with relatively large daily water yield.

The invention relates to the technical field of natural gas development, in particular to an offshore gas well hydraulic control pipeline fixing assembly and a speed pipe under-pressure lowering method. The problem that a speed pipe with a hydraulic control pipeline cannot be lowered under pressure in a conventional operation mode is solved, the hydraulic control pipeline can be lowered under pressure whether the hydraulic control pipeline is internally arranged or externally arranged, different fixing modes can be selected according to the actual situation and condition on site, the application range is wider, and the practicability is high. And the control problem of downhole tools of an offshore speed pipe continuous gas lift foam drainage system and the problem of operation under pressure are also solved, and well control safety is guaranteed.

The utility model discloses a visual negative pressure drainage dressing and a flushing negative pressure suction device, the visual negative pressure drainage dressing comprises a self-adhesive medical film and a foam drainage material, the self-adhesive medical film and the foam drainage material are of an integrated structure, and the visual medical dressing is provided with a drainage window and an observation window; when the visual medical dressing is used, after the protective paper is torn off and removed, the visual medical dressing is pasted to normal skin around a wound to form a closed wound treatment cavity; the foam drainage material is arranged in the mounting cavity, and a first through hole and a second through hole are formed in the foam drainage material; the flushing pipe penetrates through the drainage window and then is arranged at the bottom of the foam drainage material; and the negative pressure suction tube is arranged on the flushing tube in a sleeving manner. Due to the integrated design, the medical negative pressure drainage dressing is transparent and visual, medical staff can conveniently observe changes of a wound surface at any time, and the negative pressure drainage dressing can be used for rapidly installing and sealing the wound surface and rapidly installing and washing a drainage tube.

The invention relates to the technical field of drainage gas recovery of natural gas extraction, and discloses a natural gas well flow state control foam gas lift pressurization negative pressure gas recovery multiple composite drainage gas recovery process which comprises the steps that gas well production dynamic data are collected, an edge calculation and intelligent control center AI model is input, and the flow state in a well is judged; preferably switching among foam drainage, gas lift, wellhead pressurization and negative pressure gas production processes according to the flowing state, combining into a composite process, and optimizing parameters; wherein a preferable foam drainage agent is injected during foam drainage; during gas lift, the optimal gas quantity is calculated, and multi-well-group precise gas distribution is conducted; pressure difference is constructed by pressure boosting during wellhead pressure boosting; and reducing the pressure to-80kPa by using an ultra-high-speed negative-pressure air extractor SSC during negative-pressure gas production at a wellhead. Continuously collecting second-level data, inputting the second-level data into the AI model, and adjusting a process combination and optimal parameters; according to the method, edge calculation and an intelligent control center AI model are utilized, the trend is predicted in real time according to the flow state of the shaft, the operation mode is dynamically judged and adjusted, complex working conditions can be accurately responded, and the recovery efficiency is improved.

The utility model discloses a kind of reaction systems for organic peroxidation, belong to chemical experiment equipment technical field.It includes reaction unit and stirring unit, reaction unit includes reaction cavity, it is used to accommodate reactant in it, stirring unit inserts reaction cavity, the reactant in reaction cavity is stirred, further include foam collecting unit, the foam collecting unit includes foam collection chamber, foam drainage pipe and foam trapping tank, the foam collection chamber is fixed in reaction cavity inner wall, foam drainage pipe one end communicates foam collection chamber inside, foam drainage pipe other end connects foam trapping tank, wherein, the nozzle of foam drainage pipe is towards the notch of foam trapping tank, reaction end line is set on foam collection chamber.The utility model aims at accurate judgment reaction end.

This utility model discloses an anti-clogging gas well foam drainage gas extraction pipeline dredging device, specifically relating to the field of pipeline dredging technology. It includes a base, with rollers fixedly connected to the lower end of the base, a handrail fixedly connected to the rear end of the base, a sliding frame fixedly connected to the front upper end of the base, an adjustment device fixedly connected to one side of the sliding frame, and a flushing device fixedly connected to the rear upper end of the base. This anti-clogging gas well foam drainage gas extraction pipeline dredging device allows for easy automatic adjustment of the dredging components. The lifting and telescopic functions enable the drill bit to accurately reach any blockage location within the pipeline, whether near the pipeline inlet or deep within, avoiding the hassle of multiple positioning or tool replacements required in traditional methods, significantly shortening the dredging time. The automatically rotating and angle-adjusting spiral drill bit can change direction without stopping drilling, continuously breaking and clearing complex blockage structures.

The utility model relates to the technical field of foam scrubbing, in particular to an intelligent foam scrubbing system. The system comprises a filling pry, a stirring barrel, a stock solution barrel, a water tank and a controller, the stirring barrel is provided with an electric stirrer, the stirring barrel comprises a foaming stirring barrel and a defoaming stirring barrel, the foaming stirring barrel and the defoaming stirring barrel are respectively filled with a foaming agent and a defoaming agent, the stock solution barrel comprises a foaming stock solution barrel and a defoaming stock solution barrel, a solution inlet of the foaming stirring barrel is respectively communicated with the foaming stock solution barrel and the water tank, and a solution outlet of the defoaming stock solution barrel is communicated with the water tank. A liquid inlet of the defoaming stirring barrel is communicated with the defoaming stock solution barrel and the water tank, the water tank pumps liquid into the stirring barrel through a water pump, the foaming stirring barrel is communicated with a well inlet pipeline, the defoaming stirring barrel is communicated with a well outlet pipeline or a wellhead device, the filling pry is used for driving fluid in the stirring barrel to be discharged, and the filling amount is adjustable. And the electric stirrer, the magnetic pump and the filling pry are electrically connected with the controller. The embodiment of the utility model provides an intelligent foam drainage system which can efficiently carry out foam drainage work.

The invention discloses an oil and gas well capillary tube dosing and pressure measuring integrated system and a dosing and pressure measuring method, and the system comprises a ground dosing device which is arranged on the ground; the data transmission physical wave pickup unit is arranged at a chemical outlet of the ground chemical adding device; the data transmission physical wave pickup unit is electrically connected with a ground dosing device; the physical wave data transmission pressure gauge is arranged between the oil well pump and the screen pipe; the physical wave data transmission pressure gauge is electrically connected with the data transmission physical wave pickup unit; the inlet end of the capillary tube is connected with the data transmission physical wave pickup unit, and the outlet end of the capillary tube is connected with the physical wave data transmission pressure gauge; the capillary tube is disposed between the annulus of the tubing and the casing. According to the scheme, the construction process is simple, and annulus pressure monitoring is completed while efficient paraffin removal and corrosion prevention under an oil and gas well are achieved, and the gas well foam drainage effect is improved. The method has the advantages of low cost, simplicity in construction, capability of effectively prolonging the pump inspection and well repair period and the like.

The present application provides a kind of shale gas horizontal well foam drainage process effect evaluation method, the evaluation method includes: respectively carrying out foam drainage process drainage capacity evaluation, foam drainage process stimulation capacity evaluation, foam drainage process stable production capacity evaluation and supplier service capacity evaluation, obtain the score of four kinds of capacity evaluation;Then according to different weight proportion, the score of four kinds of capacity evaluation is integrated, and the comprehensive capacity evaluation of shale gas horizontal well foam drainage process effect is carried out.The present application is based on the implementation of foam drainage process field, utilizes the whole cycle parameter change of foam drainage gas well from stimulation stage to stable production stage, carries out comprehensive evaluation calculation to multiple aspects that influence foam drainage gas recovery effect, so as to obtain the advantages and disadvantages of foam drainage well process effect, provides specific parameter quantization means for shale gas horizontal well foam drainage process effect evaluation.

The application discloses a kind of foam drainage construction boundary condition determination method and system, comprising: constructing the wellbore multiphase flow model considering pressure field, temperature field and wellbore structure;Gas reservoir production characteristic model considering reservoir shale gas adsorption and desorption characteristics is constructed;According to the target gas well production parameters predicted by the wellbore multiphase flow model and the gas reservoir production characteristic model, a critical liquid carrying speed model is constructed, and the critical liquid carrying speed of the target gas well is predicted according to the critical liquid carrying speed model;According to the gas reservoir production characteristic model, the apparent gas flow rate of the target gas well is predicted;Based on the critical liquid carrying speed and the apparent gas flow rate, the wellbore fluid accumulation time and wellbore fluid accumulation characteristics of the target gas well are determined.The method given by the application considers the influence of multiphase flow law in wellbore on gas reservoir production performance and foam drainage construction effect, and through the application, foam drainage construction effect and subsequent injection system can be judged according to real-time wellbore fluid accumulation condition.

The present application relates to the field of foam drainage gas recovery, and discloses a combined pipe column for horizontal well foam drainage, which is composed of a small-diameter pipe, a coiled tubing, a rupture disc, a guide head and a medicament injection head, wherein the small-diameter pipe is located in the coiled tubing. A method for using the combined pipe column for horizontal well foam drainage is also disclosed, which comprises the following steps: lowering the combined pipe column for horizontal well foam drainage into a designated position in a horizontal well, installing a well head of the coiled tubing, breaking the rupture disc at the bottom end of the coiled tubing, lowering the small-diameter pipe out of the coiled tubing by a certain length, and finally installing a well head of the small-diameter pipe. The present application can solve the problem that the small-diameter pipe in a long horizontal section well is not easy to be lowered into a designated position.

The invention discloses a method and system for evaluating the implementation effect of a foam drainage process, and the method comprises the steps: obtaining the drainage rate representing the drainage effect characteristics of the foam drainage process according to the real-time production data of a target well, and obtaining the pressure difference of an oil sleeve before foam drainage; based on the oil jacket pressure difference and the liquid drainage rate before foam drainage, the evaluation effect of the current foam drainage process is obtained through the foam drainage effect evaluation model. According to the invention, automatic online evaluation of the drainage and mining effect based on PCS data is realized, fine management is supported, the automation degree is high, the reliability is good, and the development of an intelligent foam drainage technology is promoted.

The invention discloses a high-salt gas field foam drainage treatment method and system, and the method comprises the following steps: S1, dual-alkali treatment: adjusting the pH value of foam drainage, then adding sodium carbonate, and stirring for reaction; s2, coagulation treatment: adjusting the pH value of the solution to 7-9, adding a coagulant, and stirring for reaction; s3, oxidation treatment: adjusting the pH value of the solution to 3-4, adding ferrous sulfate and hydrogen peroxide, and stirring for reaction; after standing and precipitating, collecting supernatant liquid; s4, membrane treatment: treating the solution through a reverse osmosis membrane, respectively collecting concentrated water and fresh water, and discharging the fresh water reaching the standard; s5, performing low-temperature evaporation treatment on the concentrated water, and collecting distilled water. According to the steps of double-alkali treatment, coagulation treatment, oxidation treatment, membrane treatment and low-temperature evaporation treatment, the foam drainage is fully treated, so that the foam drainage is thoroughly treated, the cost is relatively low, the method is suitable for treating the foam drainage of the high-salt gas field with high soluble substance content, and the treatment targets of harmlessness, reduction and recycling of the gas production wastewater of the gas field are achieved.

The invention relates to the technical field of natural gas development, in particular to an offshore gas well speed pipe continuous gas lift foam drainage system and method. The technical problem that the offshore gas well cannot continuously drain water and produce gas is solved by utilizing the offshore gas well speed pipe continuous gas lift foam drainage system; the problem of shaft integrity of the coiled tubing passing through the subsurface safety valve is solved; the accurate metering of the gas well produced liquid is realized, and accurate data support is provided for a drainage gas production process; production processes can be seamlessly switched according to different production stages and production dynamic states, continuous foam drainage gas recovery, gas lift foam drainage auxiliary gas recovery and the like are utilized, the service life of a gas well is prolonged to the maximum extent, and the recovery efficiency of the gas well is improved.

The disclosure relates to the technical field of oilfield chemistry, and in particular to a temperature-sensitive foaming drainage agent system for high-temperature and high-salt gas reservoirs, a preparation method and an application thereof. The temperature-sensitive foaming drainage agent system includes following components in parts by mass: 50-75 parts of foaming agent, 1-3 parts of temperature-sensitive material, 2-5 parts of bactericide and 500-800 parts of water; and the temperature-sensitive material is temperature-sensitive gel.

The utility model provides a foam pump with controllable foam liquid discharge, which comprises an upper cover, a first shell, a second shell, a third shell, a motor assembly, an eccentric wheel assembly, an air bag assembly, an umbrella pin assembly and a one-way valve plate, a liquid discharge cavity, an air inlet cavity and a liquid inlet cavity are arranged between the upper cover and the first shell at intervals, the air bag assembly is mounted on the second shell, and the air bag assembly is mounted on the third shell. The liquid outlet cavity, the air inlet cavity and the liquid inlet cavity penetrate through the first shell to be communicated with an inner cavity of the air bag assembly, the umbrella pin assembly is installed at the position, located on the bottom face of the air inlet cavity and the bottom face of the liquid inlet cavity, of the first shell, and the motor assembly is used for driving the eccentric wheel assembly to extrude a rubber cup of the air bag assembly for pumping. The air bag assembly is provided with a leather cup liquid cavity and two leather cup air cavities, the volume of the leather cup liquid cavity is smaller than that of the leather cup air cavities, and the umbrella pin assembly is provided with a boss structure which abuts against the first shell. According to the utility model, the foam liquid outlet effect is controllable, the problem that the umbrella pin assembly is easy to adhere can be avoided, and the service life of the umbrella pin assembly is longer.

The invention relates to a tubular composite fixed defoaming device and a defoaming method, which are used for defoaming shale gas produced liquid. The device comprises a tubular shell, a shale gas produced liquid inlet is formed in one end of the tubular shell, an outlet is formed in the other end of the tubular shell, and a three-stage defoaming structure of a Laval pipe assembly, a defoaming barrel and a cyclone which are sequentially arranged in the flowing-in direction of the shale gas produced liquid is arranged in the tubular shell. Compared with the prior art, physical and chemical combined defoaming is adopted, a filling device, a power source and ground construction do not need to be matched, the earlier-stage investment is reduced, the device does not need to be maintained and inspected, operation is not affected by low temperature, only the defoaming rods need to be regularly filled, and the defoaming efficiency is greatly improved. And the system can be combined with existing shale gas production platform equipment, so that the dependence of a foam drainage process on water resources is reduced.

The present application provides a kind of shale gas well foam drainage process whole life cycle foam agent filling concentration determination method, it is related to gas well drainage gas recovery process field.Considering the influence of high pressure on foam agent use effect, liquid holdup and friction resistance pressure drop model are used by introducing foam agent use coefficient, wellbore outflow curve under different foam agent concentration is drawn, starting filling point of foam agent is determined, and based on the relationship between gas well formation pressure and time, the production time corresponding to different formation pressures is extrapolated, and finally the relationship between the optimum filling concentration of foam agent under different formation pressures and the corresponding production time is obtained, so as to determine the foam agent filling concentration under the whole life cycle of gas well.The present application fully considers the influence of pressure and foam agent concentration on wellbore pressure drop and liquid holdup, determines the reasonable filling concentration of foam agent at different production times in the whole life cycle of gas well, and provides important theoretical support for the optimization of foam agent filling system of shale gas well foam drainage process.

The invention discloses a gas well foam drainage and sand washing composite integrated device which comprises a sand washing connecting pipe, one end of the sand washing connecting pipe is connected with a sand washing fluid conveying pipe, the other end of the sand washing connecting pipe is fixedly connected with a sand washing unit, and the outer wall of the end, close to the sand washing unit, of the sand washing connecting pipe is sleeved with a foam drainage unit. The end, away from the sand washing unit, of the foam drainage unit is fixedly connected with an injection agent connecting pipe, the other end of the injection agent connecting pipe is connected with a drainage foaming agent conveying pipe, and the sand washing connecting pipe is arranged in the injection agent connecting pipe. The gas well foam drainage and sand washing composite integrated device solves the problem that in existing drainage and sand washing operation, a filter screen is blocked and cannot be automatically cleaned.

The invention discloses a quantitative design method for gas well intermittent dosing parameters, and relates to the technical field of gas well foam drainage gas recovery. According to the method, gas well basic parameters and produced liquid physical property parameters are collected, on the basis of a Lie Fujian critical liquid carrying model and a foam liquid carrying lower limit equation, a quantitative calculation formula of the critical liquid accumulation amount and the dosing period is deduced, the single-time dosing amount is calculated in combination with the standard dosing concentration, and quantitative design of intermittent dosing parameters is achieved. As only aiming at the liquid phase which cannot be taken away by the gas-phase liquid-carrying flow velocity, a quantitative calculation basis is provided for on-site dosing parameter optimization, and meanwhile, the dosage of the medicament is reasonably reduced.

The invention discloses a foam scrubbing agent for a low-permeability tight gas well, a foam drainage rod, a preparation method and application, and relates to the technical field of natural gas development, the foam scrubbing agent is composed of 40-60% by mass of a foaming agent, 3-8% by mass of a foam stabilizer, 0.1-1% by mass of a functional additive and the balance of water, and the foam drainage rod is composed of 20-30% by mass of the foam scrubbing agent, 55-70% by mass of a degradable material, 2-5% by mass of a plasticizer and 3-10% by mass of a moisture-proof agent. The foam drainage rod is prepared by extruding a foam scrubbing agent and other components in a double-screw extruder; according to the preparation method, the degradable material is adopted as the main body of the foam drainage rod, the dissolving requirements of the foam drainage rod under different temperature requirements can be effectively met by adding the degradable material according to different proportions, and the problems that the foam drainage rod releases too fast when the foam drainage agent is taken as the main body, and the release speed cannot be effectively controlled are effectively solved; the purposes of being economical, environmentally friendly, capable of prolonging the action period of the foam scrubbing agent and controllable in degradation are achieved.

The invention discloses an oil-resistant bactericidal corrosion-inhibition foaming agent for a gas well as well as a preparation method and application thereof, and belongs to the technical field of natural gas extraction. The foaming agent comprises (A) a foaming agent, (B) a corrosion inhibition component, (C) a compatible bactericide, (D) a foam stabilizer and (E) a solvent, the corrosion inhibition component (B) is a surface active corrosion inhibitor, and the mass ratio of the surface active corrosion inhibitor to the active matter of the component (A) is 0.20-0.30. Through specific component design, the product has excellent foamability, high liquid carrying capacity, long-acting corrosion inhibition and stable sterilization functions. The foam drainage gas recovery device is particularly suitable for a foam drainage gas recovery process of a high-salinity complex gas well containing gas condensate and an acidic corrosive medium, and can achieve the dual purposes of drainage and underground protection.

The bubbling assisting device comprises a flow dividing pipe, the side wall of the flow dividing pipe is communicated with a liquid inlet pipe, one end of the flow dividing pipe is communicated with a ventilation pipe, an inner cavity of the ventilation pipe is provided with an air outlet pipe, a flow guiding rotary piece is wound around the outer wall of the air outlet pipe, a foam guiding piece is arranged on the inner wall of the flow guiding rotary piece, and a bubble generator is arranged at the other end of the flow dividing pipe. A bubble pipe is connected to the end, close to the flow dividing pipe, of the bubble generator, penetrates through the flow dividing pipe and extends into the ventilation pipe, and the bubble pipe communicates with the foam guide piece. The washing effect of water on bubbles can be improved, the bubbles can be quickly prevented from rising, and the bubble discharging efficiency is improved.

The invention provides a silicon-free defoaming agent and a shale gas well foam drainage gas recovery defoaming method, and the silicon-free defoaming agent comprises any two or three of epoxide polyether, butyl acrylate homopolymer and alkyl stearate; when the total weight of the silicon-free defoaming agent is 100%, when the silicon-free defoaming agent comprises the epoxide polyether, the butyl acrylate homopolymer and the alkyl stearate, the content of the epoxide polyether, the content of the butyl acrylate homopolymer and the content of the alkyl stearate are 20-80%, 30-60% and 10-70% respectively. When the silicon-free defoaming agent provided by the invention is applied to defoaming of foam drainage gas recovery of the shale gas well, the defoaming efficiency of foam drainage gas recovery of the shale gas well can be effectively improved, the environmental protection performance of the defoamed shale gas is improved, the influence of the defoaming agent on later oil gas refining is reduced, and the environmental protection quality of oil gas is improved.

The present application relates to a kind of bubble net synergistic solid foam displacement agent and its preparation method.Mainly solve the gas well in the process of foam drainage gas recovery, solid foam displacement agent after adding cannot fully utilize bottom-hole energy to form disturbance, with bottom-hole effusion mixture is not uniform, resulting in serious slip loss, foaming effect is poor, liquid carrying effect is poor.Its characteristics are that bubble net structure made of soluble support material is introduced, and the bubble net structure is coated on the surface of solid foam displacement agent, which plays a synergistic effect.The present application includes the following components by mass fraction: (1) 1-10 parts of bubble net structure made of soluble support material with adjustable degradation time; (2) 50-70 parts of foaming agent; (3) 1-5 parts of foam stabilizer; (4) 1-10 parts of functional additives; (5) 10-20 parts of filler.

The application discloses a slow-release bactericidal foam drainage agent and a preparation method thereof, and belongs to the technical field of foam drainage agent preparation. The slow-release bactericidal foam drainage agent is composed of the following components in parts by weight: 30-50 parts of distilled water, 6-12 parts of a surfactant, 4-10 parts of a slow-release bactericide, 3-11 parts of a protective agent, 1-4 parts of a stabilizer and 0.4-2 parts of a pH regulator. The slow-release bactericide is prepared from 3-chloropropionic acid, dipentaerythritol, triallylamine, cetyltrimethylammonium bromide, tetraethyl orthosilicate and gamma-aminoethylaminopropyltrimethoxysilane; and the protective agent is prepared from p-cycloaromatic hydrocarbon, 1,1-dichlorodimethyl ether, p-toluenesulfonamide, diethylamine and p-toluenesulfisothiocyanate. The foam drainage agent prepared by the method has excellent bactericidal effect and can well protect the pipeline from corrosion.

The present application relates to natural gas well drainage gas production pressure loss minimum theory and wellbore flow state control method, relates to gas well gas production field, including the following steps: adopting pressure supply principle and critical liquid carrying principle to establish wellbore drainage gas production process boundary condition;The weight value of technical index and the weight value of economic index are substituted into TOPSIS method to calculate, and the best drainage gas production process is selected in six drainage gas production processes of velocity string, foam drainage, gas lift, machine pumping, electric submersible pump and jet pump;According to the selected drainage gas production process, combined with the established boundary condition, the multi-objective programming model including the maximum yield objective function and the lowest compressor set energy consumption objective function in the drainage gas production process is established, the constraint condition is determined to obtain the compressor working parameter with minimum pressure loss, and the present application has the advantages that the gas production efficiency can be maximized under the condition of minimum compressor pressure.