44 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 a complex-medium-resistant multi-parameter cooperative control method and system for a gel-nano composite foam scrubbing agent, and relates to the technical field of gas field foam drainage gas recovery, and the method comprises the steps: building a complex medium parameter correlation model, and analyzing a coupling rule and an interaction weight of four parameters of mineralization degree, temperature, gas condensate content and methanol content; constructing a multi-parameter response test matrix, setting a plurality of parameter combinations, and repeating the experiment; wellbore parameters are collected in real time, and whether cooperative regulation is triggered or not is judged through a control system; aiming at the mineralization degree and temperature synergetic overrun or condensate oil and methanol synergetic overrun, respectively starting corresponding adjusting modules to carry out synergetic regulation and control; the liquid carrying efficiency is tested through dynamic simulation, and the regulation and control effectiveness is judged according to the foam comprehensive index FCI lifting amplitude and the test deviation; the system comprises a parameter acquisition module, a data transmission module, a control module and a plurality of adjustment modules, and real-time monitoring and dynamic coordinated regulation of parameters are realized. The stability and liquid carrying efficiency of the foam scrubbing agent in a complex medium are effectively improved, the foam scrubbing agent adapts to the severe environment of a western gas field, and stable production of a gas well is guaranteed.

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 application discloses a foam backflushing timing prediction method based on adaptive cycle division and deep learning, relates to the technical field of oil and gas production engineering in the petroleum industry, and comprises the following steps: S1, collecting dynamic data of gas well production in foam backflushing operation, and performing stage division of a foam backflushing cycle according to the dynamic data of gas well production; S2, sampling dynamic data of different foam backflushing stages to obtain positive and negative samples; S3, establishing a foam backflushing agent injection timing prediction model based on the positive and negative samples; and S4, inputting dynamic data of gas well production to be predicted into the foam backflushing agent injection timing prediction model to obtain a prediction result of the foam backflushing agent injection timing. The application solves defects of existing methods in dynamic adaptability, data feature mining and stage division strategies, thereby significantly improving the prediction accuracy and reliability of the foam backflushing agent injection timing, can intervene before liquid loading occurs in the gas well, improves production efficiency, and can timely improve the gas well productivity and improve economic benefits.

The utility model discloses an agent injection device for a gas well cluster well site, which comprises a liquid inlet pipeline and an agent injection main pipeline, a first manual switching control valve is arranged at the joint of the liquid inlet pipeline and the agent injection main pipeline, a liquid feeding pump is arranged on the liquid inlet pipeline, and the liquid inlet pipeline is further connected with an agent storage tank through a pipeline. The connecting position of the agent storage tank and the liquid inlet pipeline is located between the liquid feeding pump and the first manual switching control valve, the agent injection main pipeline is connected with a gas production tree through a plurality of agent injection branch pipelines, and frequency conversion control high-pressure injection pumps are arranged on the agent injection branch pipelines. According to the utility model, the problem of low automation and intelligence degree of the existing vehicle-mounted foam drainage process technology is solved, one set of agent injection device can be used for simultaneously and continuously injecting agents into a plurality of gas wells in a cluster well site at different displacements, and the defects that the foam drainage operation depends on manpower, the foam drainage operation conditions are limited and the foam drainage efficiency is low are also overcome; therefore, the gas well drainage measure effect and economic benefits are improved.

The invention provides a method for predicting low-liquid-volume gas-liquid-foam multiphase flow characteristics of an inclined pipe. The method comprises the steps that firstly, according to basic gas-liquid physical property parameters, gas-liquid phase apparent velocity, a pipeline inclination angle and the diameter, the flow pattern of the gas-liquid-foam multiphase flow of the inclined pipe is judged by adopting the minimum interfacial shear stress and a mechanical dynamic equilibrium rule; 2, judging the flow pattern of gas-liquid-foam multiphase flow of the inclined pipe, and calculating the closed relation of section phase volume fraction, wetted wall fraction, foam density and viscosity; 3, calculating the wetted perimeter, area and interface length of each phase, and deducing the actual flow velocity or flow velocity distribution relational expression of each phase; 4, improving and correcting the classical correlation formula of each phase-wall surface friction factor and each phase interface friction factor, and calculating the shear stress of each phase-wall surface and each phase interface according to the actual flow velocity; 5, performing pressure gradient solution or iterative calculation according to the corresponding flow pattern control model; the prediction precision can be improved, and the stability and efficiency of the foam drainage technology are effectively improved.

The present invention relates to the field of gas production engineering technology, and in particular to an automatic rapid defoaming supporting device and method for a gas gathering station. The method mainly solves the problem of foam defoaming in the well group manifold and separator of the gas gathering station in the foam drainage gas production process. The automatic rapid defoaming method for a gas gathering station is mainly realized by an automatic rapid defoaming supporting device for a gas gathering station, comprising an automatic defoaming control device (1), an injection device (2), a necking pipe, a two-stage atomizing device, and a two-stage foam detection device; the automatic defoaming control device (1) is used to optimize the injection amount of the defoaming agent; the injection device (2) is connected to the automatic defoaming control device (1) for controlling the amount of injected defoaming agent; the two-stage atomizing device is used for rapid and thorough defoaming; the two-stage foam detection device is used to determine the foam content; the present invention can meet the requirements of a short defoaming distance and rapid and thorough defoaming of a gas gathering station, and greatly reduces the cost of defoaming agent injection.

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 application relates to the technical field of defoaming agents and discloses a kind of silicone defoaming agent composition for foam drainage gas production and a preparation method thereof, the silicone defoaming agent composition for foam drainage gas production, comprising the following ingredients: silicon paste, emulsifier, synergist, thickening agent, deionized water; the silicon paste comprises the following three components: silicon paste I, silicon paste II and silicon paste III. It is found in the process of experiment that the silicon paste prepared by silicon hydrogen addition reaction has obvious defoaming and foam suppressing effects when applied in the silicone defoaming agent for gas production. The three silicon pastes with different viscosities have both defoaming and foam suppressing properties, so that the defoaming and foam suppressing properties of the product are considered. Through the introduction of the synergist, excellent bubble breaking performance is achieved, and the precipitation compatibility problem of the product is reduced.

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 embodiment of the invention discloses a method and device for determining the filling time of a defoaming agent and electronic equipment, and the method comprises the steps: calculating the descending time of a foaming agent descending from a wellhead to a tubing shoe according to gas well structure parameters of a target gas well and basic parameters of the foaming agent added into the target gas well; dividing a well section between a wellhead and a tubing shoe in the target gas well into a plurality of to-be-calculated well sections, sequentially taking each to-be-calculated well section as a target well section from bottom to top, and calculating productivity data corresponding to the target gas well when foam corresponding to the foaming agent rises to the target well section from the tubing shoe; the convergence of the productivity data is judged, and if the convergence of the productivity data is convergence, the rising time of the foam rising from the tubing shoe to the target well section is calculated based on the productivity data; and based on the descending time and the ascending time corresponding to each target well section, the defoaming agent filling time corresponding to the target gas well is determined, determination of the defoaming agent filling time is achieved, and a theoretical basis is provided for optimization design of a foam drainage gas recovery process.

The invention relates to the field of drainage gas recovery, and discloses a foaming agent, a response agent, a foam drainage method and application. The foam drainage method comprises the following steps: carrying out first mixing on a foaming agent and a liquid phase to be drained, and introducing gas for foaming; wherein the foaming agent contains a main surface active agent, N-dodecyl N, N-dimethyl tertiary amine, hexadecyl diphenyl ether sodium disulfonate and fatty alcohol polyoxyethylene ether sodium acetate. By adopting the method provided by the invention, the defoaming can be quickly completed, the production efficiency is greatly improved, the foaming agent can be repeatedly used, the production cost is obviously reduced, and the formation of hydrates can be inhibited.

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 discloses an imidazoline corrosion inhibitor, a corrosion and scale inhibition foam drainage three-in-one functional system containing the imidazoline corrosion inhibitor and a preparation method, the imidazoline corrosion inhibitor has a structural formula shown in a formula (I), and the corrosion and scale inhibition foam drainage three-in-one functional system containing the imidazoline corrosion inhibitor has a structural formula shown in a formula (II). The cleaning agent comprises the following components in percentage by mass: 20%-30% of an imidazoline corrosion inhibitor, 10%-20% of a scale inhibitor, 5%-10% of a foam scrubbing agent, 8%-12% of ethanol and the balance of water. A three-in-one functional system of the corrosion and scale inhibition foam scrubbing agent can effectively inhibit metal corrosion caused by CO2 and H2S, and equipment damage and maintenance cost are reduced by reducing the corrosion rate of the metal surface, so that the service life of equipment is prolonged; inorganic salts such as calcium carbonate and calcium sulfate are prevented from depositing on the inner wall of the equipment, and the heat transfer efficiency of the equipment can be maintained, the energy consumption is reduced and the cleaning frequency and cost are reduced by reducing the formation of a scale layer; bubbling and liquid carrying can be effectively carried out, and gas well production is guaranteed.

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 present application relates to the technical field of foam drainage agents, and specifically discloses a foam drainage agent for gas production and a preparation method thereof. The foam drainage agent is obtained by mixing the following raw materials in parts by mass: 40-50 parts of water, 20-35 parts of a composite product, 5-8 parts of oligoethylene glycol, and 3-5 parts of an imidazoline corrosion inhibitor. The preparation steps include the following: taking the composite product, water, oligoethylene glycol, and the imidazoline corrosion inhibitor, and stirring to obtain the composite product; the composite product is obtained by an etherification reaction between brominated amine oxide and phenolic hydroxybiphenyl; the composite product of the present application is combined with oligoethylene glycol to prepare the foam drainage agent for gas production, which can improve the foaming and foam stabilization capabilities of the foam drainage agent for gas production, and the oil resistance rate of the foam drainage agent product is ≥88.4%.

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.