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1417 results about "System pressure" patented technology

Coiled tubing supercritical CO2 jet fracturing method

ActiveCN102168545AJet rock breaking efficiency is highRock breaking threshold pressure is lowLiquid/gas jet drillingFluid removalWater basedFracturing fluid
The invention relates to a coiled tubing supercritical CO2 jet fracturing method. The method is used for performing jet fracturing on oil well reservoirs by taking supercritical CO2 as fracturing fluid. By the method, a supercritical CO2 fluid is used as the fracturing fluid to perform the jet fracturing; a supercritical CO2 sand jet perforating hole can reduce system pressure; the pressure needed by fissure extension can be further reduced by the characteristics of low viscosity and high dispersion performance of the supercritical CO2 fluid; most importantly, the supercritical CO2 jet fracturing does not pollute the reservoirs, but the supercritical CO2 can further improve the oil and gas recovery ratio after entering the reservoirs; the return discharge is not needed after the fracturing is completed; when the stage-by-stage jet fracturing is performed by using the coiled tubing, a tube pillar can be lifted or put down without mineshaft pressure relieving, the operation process is reduced and the operation cost is reduced, so that the method is extremely suitable for fracturing modification of unconventional oil-gas reservoirs such as thick oil reservoirs, low permeability and super-low permeability oil-gas reservoirs, shale gas reservoirs, coal bed methane reservoirs and the like of which the effects are low by using the conventional water-based fracturing fluid.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

High temperature and high pressure visual device for simulating microorganism oil displacement and simulating method thereof

ActiveCN103216222AConvenient and effective temperatureConvenient and effective ring pressure sizeConstructionsFluid removalMicroorganismTemperature control
The invention relates to an experimental method and a device for simulating the process that microcosmic remaining oil is extracted in a microcosmic simulation model under the condition of oil deposit high temperature and high pressure, researching feasibility of microorganism oil displacement technology in improving enhanced oil recovery after water drive, and carrying out visualized microcosmic oil displacement experimental research under the high temperature and high pressure experimental conditions, in particular to a high temperature and high pressure visual device for simulating microorganism oil displacement and a simulating method thereof. The device comprises a model clamp clamping a microcosmic visual model, a displacement system, a back pressure system, an annular pressure system, a pressure monitoring system, a temperature control system and an image collecting system. According to the device, temperature and pressure can be controlled easily, used space is small, safety performance is excellent, operation is simple, action mechanism of microorganism and petroleum hydrocarbon and starting mechanism of the microorganism on the remaining oil can be conveniently observed in a visualized condition, and the device has important significance on wide application and popularization of microcosmic experiments in oil industries.
Owner:UNIV OF SCI & TECH BEIJING

Pressure control method of air conditioning system

The invention discloses a pressure control method of an air conditioning system. The pressure control method comprises the following steps: S1, respectively comparing detected outdoor ambient temperature and exhaust pressure of a compressor with a preset temperature range and preset pressure, judging whether to reduce the exhaust pressure or not according to comparison results, and if so, starting the step S2; S2, reducing the rotational speed of an indoor fan during refrigeration and reducing the rotational speed of an outdoor fan during heating; S3, comparing detected degree of superheat of inhaled air or exhaust pressure with preset degree of superheat or preset exhaust pressure, judging whether to withdraw from the control of reducing the exhaust pressure or not according to the comparison results, and if so, starting the step S4; S4, stopping the reduction of the rotational speed of the indoor fan during refrigeration and stopping the reduction of the rotational speed of the outdoor fan during heating. Through the adoption of the pressure control method of the air conditioning system disclosed by the invention, the exhaust pressure of the system can be controlled within a certain range; furthermore, the method is low in cost and good in effects, and cannot impact the reliability of the air conditioning system.
Owner:GREE ELECTRIC APPLIANCES INC

Energy-saving shield segment assembling and positioning electro-hydraulic control system adopting load-sensitive technology

InactiveCN103032396APrecise control of assembly positioningImprove construction qualityUnderground chambersServomotorsControl signalSystem pressure
The invention discloses an energy-saving shield segment assembling and positioning electro-hydraulic control system adopting a load-sensitive technology. The system comprises a motor, a variable pump, a two-position three-way proportional reversing valve, a variable cylinder, an overflow valve, a pressure reducing valve, a pressure compensating valve, a one-way valve, a multi-way valve, a balancing valve, a hydraulic lock, a hydraulic motor, a hydraulic cylinder, a moment rotation speed sensor, a displacement sensor and a pressure sensor. The multi-way valve with the pressure compensating valve in a segment assembling system is used for controlling the rotation speed of the hydraulic motor for driving the segment assembling machine to rotate and the moving speed of each hydraulic cylinder. The pressure sensor is used for detecting the pressure of a main oil passage of the system and the working pressure of each executer in real time; and a computer control unit is used for determining a variable pump control signal according to a system pressure signal, so that the displacement of the variable pump is changed with the load change so as to achieve load sensitive control. According to the invention, energy waste caused by continuous oil supply at the highest working pressure of the traditional system is avoided, the throttling loss and overflow loss are greatly reduced, and an obvious energy saving effect is obtained.
Owner:ZHEJIANG UNIV

Measuring method for isothermal adsorption/desorption curve of coaly shale

The invention provides a measuring method for an isothermal adsorption/desorption curve of coaly shale. The measuring method mainly comprises the following steps of: placing a coaly shale specimen into a true triaxial core clamping system; setting an initial measuring state of the specimen according to the actual stratigraphic condition; carrying out an adsorption/desorption experiment on the specimen after the volume of a free pore is calibrated; respectively measuring and recording a cumulative flow value of gas at an inlet end or outlet end and a balanced system pressure value according to a high-precise gas mass flow meter at the inlet end or outlet end and a system pressure sensor; calculating to obtain the volume of the absorbed gas; and then, drawing the isothermal adsorption/desorption curve of the coaly shale specimen. By using the measuring method, influences of a strain field, a temperature field and the like to the adsorption/desorption of gas on the surface of the coaly shale can be truly reflected, experiments carried out under the influence of single factor and experiments carried out under the coupled action of multiple factors can be achieved, and the measured adsorption/desorption curve can be used for truly representing the adsorption/desorption characteristic for gas in an actual coaly shale reservoir.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Solar seawater desalination device

The invention discloses a solar seawater desalination device, which comprises a vacuum tube type solar heat collector with cold and hot water tanks, a combined evaporative condenser, a seawater evaporator, a vapor condenser, a scroll vacuum pump, a heat pump circulation system, a fresh water tank, a strong brine tank, a sieve plate, a pressure reducing valve and the like. The device adopts the scroll vacuum pump to obtain higher negative system pressure to reduce the evaporation temperature of seawater; between the seawater evaporator and the vapor condenser, the heating cycle of a heat pump is utilized to supply the latent heat released by vapor condensation to the seawater evaporator and provide the heat for the evaporation of the seawater, and the device fully and effectively recovers the latent heat of condensation of water vapor; and the combined evaporative condenser is adopted to ensure that the seawater can be immediately condensed after the evaporation of the seawater and reduce the load of the vacuum pump. The device has the advantages of high efficiency, low energy consumption, compact structure, high fresh water yield and the like, and is suitable to solve the water drinking problem in water-deficient areas and the water drinking problem of operating personnel on ships and offshore platforms all year round.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Oil charging accurate control method for wet clutch

The invention relates to an oil charging accurate control method for a clutch in the gear shifting process of a wet double-clutch automatic transmission. The oil charging process of the clutch is divided into four stages. In the first stage, oil is rapidly charged into the clutch, the oil charging pressure satisfies the equation that P1=P0+delta P1, P0 is the target pressure, and the most appropriate delta P1 value under each oil temperature and gear shifting type is found out through an experiment mode by considering the influences of the oil temperature of a gear box and the gear shifting type. In the second stage, oil charging compensation is carried out on the clutch subjected to rapid oil charging, the oil charging pressure satisfies the equation that P2=P0+delta P2, and the most appropriate delta P2 value under each gear shifting type and system pressure is found out through an experiment mode by considering the influences of the gear shifting type and system pressure. In the third stage, oil charging waiting is carried out on the clutch, the oil charging pressure satisfies the equation that P3=P0, and the third stage is ended when the pressure of the clutch reaches 95% of the target pressure. In the fourth stage, oil charging is finished. By controlling the pressure of each stage, rapid and accurate response of the pressure of the oil charging process of the clutch can be realized, and impact caused by pressure overshoot of the clutch is avoided.
Owner:CHINA FIRST AUTOMOBILE

Elevated operation vehicle and platform leveling hydraulic system thereof

The invention discloses a platform leveling hydraulic system comprising a leveling cylinder, an arm-joint amplitude cylinder, a priority valve, a first flow control valve and a second flow control valve, wherein the first flow control valve is used for controlling the liquid feeding quantity of two cavities of the leveling cylinder; the second flow control valve is used for controlling the liquid feeding quantity of two cavities of the arm-joint amplitude cylinder; an oil inlet of the priority valve is communicated with a system pressure oil channel, a main oil port of the priority valve is communicated with an oil inlet of the first flow control valve, and a secondary oil port of the priority valve is communicated with an oil inlet of the second flow control valve; and a first control oil port for controlling the opening of the main oil port to change in an increasing trend is communicated with an oil outlet of the first flow control valve, and a second control oil port for controlling the opening of the secondary oil port to change in an increasing trend is communicated with the oil inlet of the first flow control valve. System pressure oil firstly satisfies the flow requirement of the leveling cylinder and can effectively avoid platform leveling advance or lag phenomena. On the basis, the invention also provides an elevated operation vehicle with the platform leveling hydraulic system.
Owner:XCMG FIRE FIGHTING SAFETY EQUIP CO LTD

Low-frequency disturbance and high-speed impact type high-pressure true triaxial test device and low-frequency disturbance and high-speed impact type high-pressure true triaxial test method

The invention relates to a low-frequency disturbance and high-speed impact type high-pressure true triaxial test device and a low-frequency disturbance and high-speed impact type high-pressure true triaxial test method. The device comprises a dead load loading framework, a dynamic load loading framework, four dead load loading actuators, two dynamic load loading actuators and a split Hopkinson press bar mechanism, wherein all the actuators are connected with an oil source system; hollow ducts are formed in axial centers of piston shafts of the dynamic load loading actuators, dynamic pressure sensors in a hollow annular structure are mounted at the end parts of the piston shafts, and the split Hopkinson press bar mechanism respectively applies high-speed impact loads to a rock sample by virtue of the hollow ducts and the dynamic pressure sensors; the two dynamic load loading actuators adopts a static pressure oil path balancing-supporting sealing manner and are connected with the oil source system through servo valves, energy accumulators are assembled to oil paths, the flow is increased by virtue of the servo valves to drive dynamic response of pistons, and the system pressure during low-frequency disturbance loading is balanced by virtue of the energy accumulators. According to the device and the method, low-frequency disturbance loads and high-speed impact loads are freely applied to the same equipment for the first time.
Owner:NORTHEASTERN UNIV
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