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44results about How to "Good flow control" patented technology

Three-phase foam complex oil flooding system and application thereof

The invention relates to a three-phase foam complex oil flooding system and application thereof. The three-phase foam complex oil flooding system consists of a foaming agent, a foam stabilizer, water and gas, wherein the foaming agent and the foam stabilizer are uniformly dispersed into the water to form an oil flooding system solution; the proportion of components is as follows: the foam stabilizer is 0.1-0.3% in percentage by mass, and the foaming agent is 0.1-0.4% in percentage by mass; the gas is nitrogen, carbon dioxide or natural gas; the volume ratio between the oil flooding system solution and the gas is 1:(1-1.5), and the oil flooding system solution and the gas are alternately injected into the stratum or rock cores. The three-phase foam complex oil flooding system disclosed by the invention can be used for reducing the liquid discharge speed of a liquid membrane, increasing the viscoelasticity and strength of the liquid membrane, and ensuring that the foam is more stable, has good oil flooding effects, and can be used for enhancing the oil recovery.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)

Hyperbranched hydrophobical-associating water-soluble polymer and its preparation method

The invention discloses a hyperbranched hydrophobical-associating water-soluble polymer and its preparation method. The polymer is obtained through copolymerizing acrylamide, acrylic acid, a hydrophobic monomer and functional hyperbranched macromolecules. The preparation method of the polymer comprises the following steps: 1, respectively dissolving a hyperbranched polyamide-amine macro-molecular skeleton treating diethylenetriamine as a core and maleic anhydride (or acryloyl chloride or acrylic anhydride) in dimethyl sulphoxide, slowly adding the skeleton monomer solution to the maleic anhydride solution in a dropwise manner, letting in nitrogen, placing the obtained system in an icy salt bath, stopping the dropwise addition of the skeleton monomer solution when the pH value of a reaction solution reaches 4-5, and precipitating with chloroform to obtain a functionalized skeleton monomer; and 2, carrying out free radical aqueous solution polymerization of sodium acrylate, acrylamide, the hydrophobic monomer dimethylallyl-N-alkylammonium chloride and the functional skeleton monomer. The preparation method has a reliable principle and is simple to operate, and the synthesized polymer still has a good thickening capability and a good seepage performance under a high mineralization degree and a strong shearing action.
Owner:SOUTHWEST PETROLEUM UNIV

Load sensitive pressure compensation multiway valve for excavator

The invention discloses a load sensitive pressure compensation multiway valve for an excavator, which includes a valve body, nine operating valves sequentially arranged on the valve body, as well as an oil inlet and an oil return opening arranged at the left end of the valve body, wherein oil inlets are arranged on the nine operating valves respectively; the valve body adopts an integral structure formed by integral casting; an oil inlet channel and an oil return channel are arranged inside the valve body; valve rods are arranged inside the valve body; pilot valves are arranged at the two ends of the valve rods respectively; and a flow control valve, a load feedback valve, a safety valve, a pressure compensation valve, an oil filling valve, an overload overflow valve and a one-way inlet valve which correspond to all the operating valves as well as connecting oil chambers among all the operating valves are arranged on the valve body. The load sensitive pressure compensation multiway valve has the advantages of low cost, compact structure, low pressure loss, excellent flow control property during operation, and the realization of functions of flow control, pressure compensation, automatic oil filling, safety protection and the like.
Owner:湖北东宇机械制造有限公司

Novel anti-shearing branch polymer oil displacement agent and synthetic method thereof

InactiveCN103320112AHigh apparent viscosityExhibits lower apparent viscosity under high shear conditionsDrilling compositionPolymer sciencePolymer solution
The invention discloses a novel anti-shearing branch polymer oil displacement agent and a synthetic method thereof. According to the technical scheme, the following raw materials and monomers in mass percent are used: 73.5-84.95% of acrylamide (AM), 15-25% of sodium acrylate NaAA and 0.05-1.5% of polyamidoamine modified branch skeleton GA taking 1,3-propane diamine as a core. The synthetic method of the novel anti-shearing branch polymer oil displacement agent comprises the following steps of: adding NaAA into a reactor, adding pure water, regulating pH to be 6.5-7.5 with NaOH, stirring and adding AM and GA, preparing a solution with the concentration of 15-30%, introducing nitrogen for 20 minutes, then adding an initiating agent, continuously introducing the nitrogen for 10-20 minutes, and reacting for 3-10 hours at 30-60 DEG C; and finally washing, smashing and drying, thus an AM / NaAA / GA ternary polymer is obtained. The novel anti-shearing branch polymer oil displacement agent shows good shearing dilutability, the problem of injection of medium and low permeation oil reservoirs can be better solved, under lower shearing action, viscosity of the polymer can be rapidly restored, good fluidity control ability and aqueous phase permeability reducing capacity are realized, capacity of a polymer solution for expanding swept volume is improved, and simulated crude oil recovery ratio can be effectively increased by about 12.3%.
Owner:SOUTHWEST PETROLEUM UNIV

Polyacrylamide microsphere system and preparation method and application thereof

The invention relates to a microemulsion system and a preparation method thereof, in particular to a polyacrylamide microsphere system and a preparation method and application thereof. The microspheresystem is prepared through an emulsion polymerization reaction under the action of a composite initiator. The emulsion system comprises the following components in percentage by mass: 10%-60% of a monomer, 0.1%-3% of an organic salt, 3%-20% of an emulsifier, 0.01%-2% of a co-emulsifier, 0.01%-1% of a cross-linking agent, 0.001%-0.5% of an initiator, 0.001%-1% of a polymerization auxiliary agent,10%-70% of deionized water and 10%-50% of a non-polar solvent. The polymer microsphere system is used as an interface enhancer for emulsion flooding, can effectively improve the expansion modulus andshear modulus of an emulsion interface, and enhances emulsion stability; and after compounding polymer microspheres and a surfactant, a very good fluidity control effect is obtained and the profile control and flooding capacity of emulsion flooding is improved.
Owner:CHINA PETROLEUM & CHEM CORP +1

Water-soluble hydrophobic associated polymer oil displacement agent and synthesis method thereof

The invention discloses a water-soluble hydrophobic associated polymer oil displacement agent and a synthesis method thereof. The synthesis method includes: copolymerizing, by mass, 53.5-59.9% of AM (acrylamide), 40-45% of AA (acrylic acid) and 0.1-1.5% of DNDA (N, N-diallyl oil imide), and then, performing sulfonated modification for terpolymers by using formaldehyde and sodium bisulfite as sulfonating agents, wherein the components in sulfonation include, by mass, 90.0-95.0% of the AM / AA / DNDA terpolymers and 5.0-10.0% of the sulfonating agents composed of the sodium bisulfite and the formaldehyde, and the ratio of the sodium bisulfite to the formaldehyde is 2:1-5:1. The polymer oil displacement agent is good in temperature resistance and salt tolerance and is capable of achieving better fluidity control capability, reducing water-phase permeability, improving polymer solution swept volume expanding capability and effectively increasing simulated oil recovery ratio.
Owner:SOUTHWEST PETROLEUM UNIV

Temperature-resistant salt-resistant viscoelastic polymer gel microsphere, profile control and flooding agent, and preparation methods and applications thereof

ActiveCN111087536APlay a role in profile controlPlay the effect of adjusting and drivingDrilling compositionMicrosphereCrosslinked polymers
The invention relates to a temperature-resistant and salt-resistant viscoelastic polymer gel microsphere and a profile control and flooding agent as well as preparation methods and applications thereof, and mainly solves the problems that in the prior art, polymer microspheres generally only have a profile control effect on medium-high permeability oil reservoirs, and have difficulty in controlling the fluidity of low-permeability oil reservoirs. According to the technical scheme, the polymer gel microsphere is adopted; the polymer gel microsphere comprises a gel microsphere and a polymer coated on the microsphere, wherein the gel microsphere is a crosslinked polymer containing an acrylamide structural unit; and the polymer is a water-soluble polymer containing an acrylamide structural unit. The problem is well solved, and the prepared temperature-resistant salt-resistant viscoelastic polymer gel microsphere profile control and flooding system is directly used or compounded with otheroilfield chemicals, and then is used for onsite application such as deep profile control, flooding and the like for tertiary oil recovery of high-temperature and high-salinity oil reservoirs to increase the recovery ratio.
Owner:CHINA PETROLEUM & CHEM CORP +1

Load sensitive forklift multi-way valve

The invention provides a load sensitive forklift multi-way valve, and belongs to the technical field of engineering machinery hydraulic components. The load sensitive forklift multi-way valve comprises an oil inlet valve piece, a lifting valve piece, an inclined valve piece, a fitting valve piece and an oil return valve piece. All the valve pieces are provided with flow control valve rods and oil inlet one-way valves respectively, the inclined valve piece is provided with a load maintaining valve, and the oil return valve piece is provided with an unloading valve core, a reset spring, a shuttle valve and a secondary overflow valve. The load sensitive forklift multi-way valve has good flow control performance, so that the speed of an executing mechanism is unrelated to the load pressure and is only associated with the stroke of the valve rods, and the pressure of a system is unrelated to flow change of oil feeding. Meanwhile, the inclined valve piece is provided with the load maintaining valve, so that the forwards leaning pressure keeps stable all the time, load on an oil cylinder is lowered, when the system flow is larger than the required flow, oil return is conducted on the redundant flow through the unloading valve core, energy consumption can be effectively reduced, and the load sensitive forklift multi-way valve is high in efficiency and less in power loss, so that fuel is saved and a hydraulic system is lower in heating quantity.
Owner:ZHEJIANG HAIHONG HYDRAULIC TECH

Plugging agent for postponing colloid foam and method thereof for oilfield high-water-content aquifer profile modification water plugging

The invention relates to a plugging agent for postponing colloid foam and a method thereof for oilfield high-water-content aquifer profile modification water plugging. The plugging agent is composed of a foaming agent system solution and gas, wherein the foaming agent system solution is formed by uniformly dispersing 0.05-0.30% of foaming agent, 0.4-0.6% of water-drum aqueous emulsion polymer and 0.2-0.4% of multiplex emulsion crosslinking agent; and the volume ratio of the foaming agent system solution to the gas under reservoir pressure is 1:(1-3). The plugging agent for postponing colloid foam is used for oilfield high-water-content aquifer profile modification water plugging, and can enhance the oil recovery rate. The invention also provides a method for oilfield high-water-content aquifer profile modification water plugging. The plugging agent has the advantages of high dissolution rate, easy preparation, low initial viscosity and the like, can satisfy on-line injection, enhances the site operability, and saves the construction time and input cost.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)

Dielectric barrier discharge plasma exciter and system

The invention discloses a dielectric barrier discharge plasma exciter and system, belongs to the field of a plasma exciter and is designed to solve the problem of low wall jet speed of a conventional device. The dielectric barrier discharge plasma exciter at least comprises a medium body, a first electrode arranged on the surface of the medium body, and a second electrode and a third electrode which are arranged in the medium body, wherein the first electrode, the second electrode and the third electrode are parallel mutually; high-density plasma can be produced between the first electrode and the second electrode; and the third electrode is used for improving the wall jet speed. The dielectric barrier discharge plasma exciter system comprises at least two groups of same exciters above. The dielectric barrier discharge plasma exciter and system can carry out independent control and organic unification on production and pneumatic excitation of plasma, so that the flow control performance of the plasma exciter is improved; and the dielectric barrier discharge plasma exciter and system are wide in application range, and are especially suitable for the field of flow control of the a wing / an engine.
Owner:BEIJING AERONAUTIC SCI & TECH RES INST OF COMAC +1

Efficient interception system and control method for agricultural non-point source pollution

ActiveCN105672448AMore interceptionClosure technology is simple and efficientSewerage structuresIrrigation ditchesControl mannerAgricultural engineering
The invention discloses an efficient interception system and a control method for agricultural non-point source pollution. The efficient interception system comprises a gate for opening and closing an interception hole, a hoist for controlling the gate to be opened and closed, an ultrasonic open channel flowmeter and a control unit, wherein the ultrasonic open channel flowmeter is arranged in an interception well and is used for measuring flow of water in the interception well, and an output of the flowmeter is connected to the control unit; the output end of the control unit is connected with the hoist, to make the hoist control the gate to be opened and closed according to the flow detected by the ultrasonic open channel flowmeter. The efficient interception system is simple in structure and can realize interception according to a change of a flow difference. The efficient interception system intercepts sewage of an agricultural non-point source by a flow and time combination control mode according to the relevance between the runoff volume of an agricultural irrigation ditch and DTP concentration and the occurrence law of a concentration peak, so that more pollutants can be intercepted to the maximum extent under a condition of the same intercepted water volume. Compared with the existing interception technology, the efficient interception system is simpler, more convenient and more efficient.
Owner:中科恩吉瑞特(烟台)科技发展有限公司

Temperature-resistant and salt-resistant jelly dispersion nitrogen foam composite control and flooding system and its preparation method

The invention belongs to the field of oilfield chemistry, and particularly relates to a thermal-resistance and salt-tolerance dispersed gel nitrogen foam composite profile control system. The thermal-resistance and salt-tolerance dispersed gel nitrogen foam composite profile control system comprises a gas phase and a liquid phase, wherein the gas phase is nitrogen, and the liquid phase comprises a foaming agent, a foam stabilizer and a liquid dosing water and the balance of water; the mass fraction of the foaming agent in the total mass of the liquid phase is 0.1% to 0.4%, the mass fraction of the foam stabilizer in the total mass of the liquid phase is 0.05% to 0.15%, and the sum of the mass fractions of the components is 100%; and the gas-liquid ratio of the gas phase to the liquid phase is controlled to be 3-5: 1. An adopted nanoscale or micron-sized dispersed gel has good foaming and foam stabilizing synergistic effect with a betaine ampholytic surfactant, the swept volume and displacement efficiency of the foam composite profile control system are improved to the maximum extent, the system can be resistant to the temperature of 130 DEG C, the total salinity of 17*104 mg / L, the calcium ions of 1.0*104 mg / L and the magnesium ions of 1.0*104 mg / L, and the profile control effect of a high temperature and high salt oil deposit can be improved to the maximum extent.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1

Enhanced oil extraction method with improved recovery efficiency

The invention relates to an enhanced oil extraction method, and mainly solves the problem that in the prior art, the oil displacement compositions have bad oil displacement efficiency. The method comprises the following steps: (1) mixing an oil displacement composition with an oil displacement water to obtain an oil displacement system; and (2) contacting the oil displacement system with an oil containing stratum so as to displace the crude oil in the oil containing stratum under simulated oil filed stratum water conditions: oil displacement temperature 20-120 DEG C and total mineralization >5000 mg / L; wherein the oil displacement composition comprises the following components in parts by weight: (1) 1 part of surfactant and (2) 0 (not included) to 50 parts of polymer; the concentration of surfactant in the oil displacement system is 0.001 to 2.0 wt%, and the polymer concentration is 0 to 1.8 wt%. The method well solves the abovementioned problem and can be applied to oil displacement composition production and tertiary oil recovery.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for improving crude oil recovery ratio in underground oil reservoir in later period of oil field oil recovery

The invention provides a method for improving the crude oil recovery ratio in an underground oil reservoir in a later period of oil field oil recovery. The method comprises the following steps of: a, injecting an ultra-high-molecular polymer solution into an injection well subjected to polymer-activating agent binary compound flooding to be used as a pre-slug, wherein the injection quantity is 0.05 to 0.1 time of stratum void volume, the concentration of ultra-high-molecular polymers is 1800 to 2300mg / L, and the viscosity is greater than 80mPa.s; and b, compounding the ultra-high-molecular polymers with the concentration being 1800 to 2300mg / L and the viscosity being 50mPa.s or above and anionic-non-ionic surfactants with the concentration being 2000 to 5000mg / L and the interface tension being smaller than 5.0*10<-3>mN / m according to the weight part mixture ratio being (0.15 to 0.18): (0.2 to 0.5); uniformly stirring the mixture; and injecting the mixture into the injection well, wherein the injection volume is 0.1 to 0.3 time of the stratum void volume; and c, finally injecting an ultra-high-molecular polymer solution with the concentration being 800 to 1200mg / L and the viscosity being 20 to 30mPa.s into the injection well to be used as a substrate protective slug, wherein the injection volume is 0.05 to 0.1 time of the stratum void volume.
Owner:CHINA PETROLEUM & CHEM CORP +1

Novel pneumatic membrane valve

The invention discloses a novel pneumatic membrane valve. The novel pneumatic membrane valve comprises a valve body, a water inlet, a water outlet and a valve base, wherein the water inlet and the water outlet are formed in the two sides of the valve body correspondingly. An air chamber is arranged at the upper end of the valve body. The air chamber is sequentially divided by a membrane into a membrane chamber upper cavity and a membrane chamber lower cavity from top to bottom. A valve rod is arranged in the valve body in a penetration manner. A spring is arranged at the upper end of the valverod. The spring is arranged in the membrane chamber lower cavity and abuts against the lower surface of the membrane. A valve element is connected to the bottom of the valve rod. A valve element protection cover is arranged at the upper portion of the valve element and fixedly connected with the inner side wall of the valve body. The upper surface of the valve base is connected with a valve platethrough a rotation shaft. The valve element is arranged over the valve plate. A reset spring is connected to the other end of the valve plate, and the other end of the reset spring is fixed to the inner side wall of the valve body. The novel pneumatic membrane valve is provided with the valve element protection sleeve, fluid is prevented from directly scouring the valve element, the possibility that the valve element is scoured and eroded by fluid is reduced, and the service life of the valve is prolonged.
Owner:普雷沃流体控制科技(芜湖)有限公司

Iodine working medium electric propulsion storage and supply system based on sonic nozzle flow control

The invention discloses an iodine working medium electric propulsion storage and supply system based on sonic nozzle flow control. The system comprises a control module, a square iodine storage tank, an iodine storage tank pressure sensor, a switch self-locking valve, a pressure regulating gas capacitor, a pressure regulating gas capacitor pressure sensor, a sonic nozzle assembly, a cathode supply pipeline and an anode supply pipeline. The square iodine storage tank, the switch self-locking valve, the pressure regulating gas capacitor and the sonic nozzle assembly are sequentially connected through a pipeline; the cathode outlet of the sonic nozzle assembly is connected with the cathode supply pipeline, and the anode outlet is connected with the anode supply pipeline; the pressure regulating gas capacitor pressure sensor is mounted on a pipeline between the pressure regulating gas capacitor and the sonic nozzle assembly; a pressure regulating gas capacitor heater covers the outer surface of the pressure regulating gas capacitor; and a pipeline temperature control module is coated on pipeline parts except the square iodine storage tank and the pressure regulating gas capacitor. According to the invention, the modular design of the iodine working medium electric propulsion storage and supply system is facilitated, the cost is reduced, and the system reliability and the accurate flow control capability in a high-temperature environment are improved.
Owner:成都天巡微小卫星科技有限责任公司

Pneumatic valve positioner for pneumatic diaphragm control valve and positioning method

InactiveCN106641327AGood flow controlSolve the problem of loopback featureDiaphragm valvesEngine diaphragmsFixed positionCam
The invention discloses a pneumatic valve positioner for a pneumatic diaphragm control valve and a positioning method, and belongs to the field of control valves and valve positioners. The problem that according to the pneumatic diaphragm control valve, a valve rod is positioned inaccurately due to the fact that friction force between the valve rod and filler is large is solved. The pneumatic valve positioner is composed of an air pressure transducer, a lever, a range spring, a feedback cam pivot, a feedback cam, an oscillating bar, an oscillating bar pivot, a feedback rod, a rolling wheel, a feedback spring, a regulating spring, a baffle, a nozzle, a lever pivot, a barometric amplifier, the pneumatic diaphragm control valve, a diaphragm air chamber and a valve rod. The positioning method comprises the steps that 1, air pressure is connected to the air pressure transducer; 2, the positioner is regulated by means of the moment balance principle; 3, the valve rod is positioned at the fixed position. Accurate positioning is achieved between an input air pressure signal and displacement of the valve rod of the pneumatic diaphragm control valve can be achieved.
Owner:HARBIN UNIV OF SCI & TECH

Tertiary oil recovery oil displacement composition and preparation method thereof

ActiveCN106590588AGood temperature and salt resistanceUse a wide concentration windowDrilling compositionArylHydrogen
The present invention relates to a tertiary oil recovery oil displacement composition and a preparation method thereof. A purpose of the present invention is to mainly solve the problem of poor oil displacement efficiency of the oil displacement composition in the prior art. The technical scheme of the present invention comprises that the tertiary oil recovery oil displacement composition comprises, by mass, 1) 1 part of a surfactant, and 2) 0-50 parts and more than 0 part of a polymer, wherein the surfactant is a double-hydrophilic head-based anionic surfactant, R1 is C8-C30 aliphatic hydrocarbonyl or aryl substituted by C4-C20 straight chain or branched chain saturated and unsaturated hydrocarbonyl, R2 and R<'>2 are respectively and independently at least one selected from C1-C5 alkylidene or hydroxy-substituted alkylidene, Y and Y<'> are independently selected from SO3M and COON, and M and N are independently selected from hydrogen, an alkali metal, and a group represented by a formula NR3(R4)(R5)(R6). With the technical scheme, the problem in the prior art is well solved. The tertiary oil recovery oil displacement composition of the present invention can be used in the oilfield oil displacement composition and the tertiary oil recovery production. The molecule general formula of the surfactant is defined in the specification.
Owner:CHINA PETROLEUM & CHEM CORP +1

Oil-displacing composition, preparing method of oil-displacing composition and intensified oil production method

The invention relates to an oil-displacing composition, a preparing method of the oil-displacing composition and an intensified oil production method to mainly solve the problem that the oil-displacing efficiency of an oil-displacing composition is poor in the prior art. The oil-displacing composition is prepared from, by mass, 1 part of surfactant, 0-50 parts of a polymer which accounts for larger than 0 part and 0-50 parts of alkaline matter which accounts for larger than 0 part, wherein the surfactant is a mixture formed by non-ionic surfactant shown in the formula (1) and anionic surfactant show in the formula (2) at the mass ratio of 1:(0.1-1), R1 and R2 are the same or different C4-C40 aliphatic groups, or the same or different aryl groups replaced by saturated or unsaturated alkyl with C4-C30 linear chains or branched chains, Z1 is -R01Y1, R01 is selected from C1-C5 alkylidene or alkylidene replaced by hydroxyl, and Y1 is selected from SO3M or COON. The problem is well solved through the technical scheme, and the oil-displacing composition can be used for an oil field and intensified oil production. The formula (1) and the formula (2) can be seen in the specification.
Owner:CHINA PETROLEUM & CHEM CORP +1

A high-efficiency interception system and control method for agricultural non-point source pollution

ActiveCN105672448BMore interceptionClosure technology is simple and efficientSewerage structuresIrrigation ditchesControl mannerEngineering
The invention discloses an efficient interception system and a control method for agricultural non-point source pollution. The efficient interception system comprises a gate for opening and closing an interception hole, a hoist for controlling the gate to be opened and closed, an ultrasonic open channel flowmeter and a control unit, wherein the ultrasonic open channel flowmeter is arranged in an interception well and is used for measuring flow of water in the interception well, and an output of the flowmeter is connected to the control unit; the output end of the control unit is connected with the hoist, to make the hoist control the gate to be opened and closed according to the flow detected by the ultrasonic open channel flowmeter. The efficient interception system is simple in structure and can realize interception according to a change of a flow difference. The efficient interception system intercepts sewage of an agricultural non-point source by a flow and time combination control mode according to the relevance between the runoff volume of an agricultural irrigation ditch and DTP concentration and the occurrence law of a concentration peak, so that more pollutants can be intercepted to the maximum extent under a condition of the same intercepted water volume. Compared with the existing interception technology, the efficient interception system is simpler, more convenient and more efficient.
Owner:中科恩吉瑞特(烟台)科技发展有限公司

A load-sensitive forklift multi-way valve

The invention provides a load sensitive forklift multi-way valve, and belongs to the technical field of engineering machinery hydraulic components. The load sensitive forklift multi-way valve comprises an oil inlet valve piece, a lifting valve piece, an inclined valve piece, a fitting valve piece and an oil return valve piece. All the valve pieces are provided with flow control valve rods and oil inlet one-way valves respectively, the inclined valve piece is provided with a load maintaining valve, and the oil return valve piece is provided with an unloading valve core, a reset spring, a shuttle valve and a secondary overflow valve. The load sensitive forklift multi-way valve has good flow control performance, so that the speed of an executing mechanism is unrelated to the load pressure and is only associated with the stroke of the valve rods, and the pressure of a system is unrelated to flow change of oil feeding. Meanwhile, the inclined valve piece is provided with the load maintaining valve, so that the forwards leaning pressure keeps stable all the time, load on an oil cylinder is lowered, when the system flow is larger than the required flow, oil return is conducted on the redundant flow through the unloading valve core, energy consumption can be effectively reduced, and the load sensitive forklift multi-way valve is high in efficiency and less in power loss, so that fuel is saved and a hydraulic system is lower in heating quantity.
Owner:ZHEJIANG HAIHONG HYDRAULIC TECH

Active eddy current generator based on electromagnetic excitation

The invention belongs to the technical field of aerodynamics, and discloses an active vortex generator based on electromagnetic excitation. The active vortex generator based on electromagnetic excitation comprises a vibrating reed, a frame structure, a permanent magnet and an electromagnetic exciter, wherein the vibrating reed, the frame structure, the permanent magnet and the electromagnetic exciter are sequentially arranged in a wing of an aircraft or a leading-edge cavity of the aircraft from top to bottom. When the active vortex generator is arranged in the wing of the aircraft, a groove structure which is matched with the vibrating reed in cross-section shape is arranged on the skin of the aircraft, the vibrating reed is embedded into the groove structure, and when the vibrating reed is buried inside the skin of the aircraft, the upper surface of the vibrating reed and the horizontal plane of the skin of the aircraft are kept consistent. According to the active vortex generator based on electromagnetic excitation, active adjustment of flow control is achieved, the parasitic drag and adverse influence of the active vortex generator under the off-design working conditions are reduced, and the purposes of optimal drag reduction and optimal noise reduction are achieved.
Owner:SHANGHAI JIAOTONG UNIV

Anti-shearing polymer and preparation method thereof

The invention relates to an anti-shearing polymer and a preparation method thereof. The polymer is a copolymer composed of acrylic amide, sodium acrylate, hydrophobic monomer dimethyl allyl-N-alkyl ammonium chloride and a functionalized framework monomer. The average molecular weight of the copolymer is 6 million. The preparation method comprises the following steps of: (1) respectively dissolving a polyamide-amide macromolecular framework monomer and maleic anhydride (or acryloyl chloride and acrylic anhydride) into dimethyl sulfoxide; slowly dropwise adding a framework monomer solution intoa maleic anhydride solution; introducing nitrogen and placing the system into an ice salt bath; when the pH (Potential of Hydrogen) value of a reaction solution is 4-5, stopping dropwise adding the framework monomer solution; and utilizing chloroform to repeatedly precipitate to obtain the functionalized framework monomer; and (2) carrying out free radical water solution polymerization on the acrylic amide, acrylic acid, the hydrophobic monomer and the functionalized framework monomer. The anti-shearing polymer and the preparation method thereof have the advantages of reliable principle and convenience for operation; and the synthesized polymer still has good tackifying capability under high-temperature, high-salinity and strong shearing effects.
Owner:SOUTHWEST PETROLEUM UNIV

A three-phase foam composite flooding system and its application

The invention relates to a three-phase foam complex oil flooding system and application thereof. The three-phase foam complex oil flooding system consists of a foaming agent, a foam stabilizer, water and gas, wherein the foaming agent and the foam stabilizer are uniformly dispersed into the water to form an oil flooding system solution; the proportion of components is as follows: the foam stabilizer is 0.1-0.3% in percentage by mass, and the foaming agent is 0.1-0.4% in percentage by mass; the gas is nitrogen, carbon dioxide or natural gas; the volume ratio between the oil flooding system solution and the gas is 1:(1-1.5), and the oil flooding system solution and the gas are alternately injected into the stratum or rock cores. The three-phase foam complex oil flooding system disclosed by the invention can be used for reducing the liquid discharge speed of a liquid membrane, increasing the viscoelasticity and strength of the liquid membrane, and ensuring that the foam is more stable, has good oil flooding effects, and can be used for enhancing the oil recovery.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
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