60 results about "Pressure buildup" patented technology

The utility model relates to the technical field of vehicle braking, in particular to a drive-by-wire pressure buildup unit which comprises a controller, a driving assembly and a brake cylinder with a piston. The output end of the driving assembly is connected with the piston; the controller is electrically connected with the driving assembly so as to control the driving assembly to drive the piston to reciprocate in the pressure buildup cavity in the brake cylinder. An original brake cylinder with a brake pedal is improved, the brake pedal is omitted, and the controller and the driving assembly are arranged at the brake cylinder, so that the brake cylinder can be changed into electric signal brake from original mechanical brake, and the brake efficiency is improved on the basis that the function of whole automobile wheel end drive-by-wire pressure buildup is achieved. The number of parts of the drive-by-wire voltage buildup unit can be reduced, the overall structure is simpler and more reliable, and the cost is low. The brake cylinder can be arranged at will according to the space of the whole automobile, so that the brake cylinder is not affected by the automobile forecabin space at the rear end of the brake pedal and the wheel end space, and the brake cylinder can be conveniently applied to more different automobile types.

The invention belongs to a gas production well opening method, and provides a columnar plunger liquid drainage gas production well opening method and a related device aiming at the technical problems that an existing plunger gas lift well opening lifting opportunity decision-making method is low in liquid drainage efficiency and occupies long gas well production time. When a well mouth throttle valve is in a closed state, a plunger is controlled to be lowered to a well bottom seating device for pressure building, well shut-in casing pressure, well shut-in oil pressure and well mouth throttled pressure of the natural gas well are collected in real time, a load coefficient is calculated, whether well opening lifting is executed or not is controlled according to the condition of the load coefficient, and in the control process, the plunger lifting opportunity decision-making model is used for making a decision on the lifting opportunity of the plunger. A dependent variable of the plunger lifting opportunity decision model is liquid carrying efficiency, and a variable is a lifting load coefficient. In the actual production process, only the load coefficient needs to be obtained in real time according to an on-line pressure collecting system on a gas field site, when the load coefficient meets the condition that psi is larger than or equal to psi min and smaller than or equal to psi max, well opening and lifting can be conducted, and the method is easy and convenient to operate and easy to achieve.

The invention relates to the technical field of header hydraulic control, in particular to a header control valve set, a hydraulic control system, a control method and agricultural machinery. The electric proportional directional valve controls the ascending speed of the header and pressure building and unloading of the metering pump, the electric proportional throttle valve controls the descending speed of the header, the flow distributing and collecting valve ensures that the left header oil cylinder and the right header oil cylinder ascend and descend synchronously, and the hydraulic control proportional throttle valve ensures that the header recovers stability when floating. And the constant pressure difference overflow valve ensures that the output flow is stable when the header ascends. The whole system has the advantages of stable and controllable action, energy conservation, high efficiency, high integration level of the valve group and the like.

The invention discloses a while-drilling pressure measurement fluidity correction method under a multi-factor interaction effect, and the method comprises the steps: constructing a while-drilling pressure measurement numerical simulation model of an anisotropic stratum inclined shaft, and deducing the model as a while-drilling pressure measurement finite element model of the stratum inclined shaft; performing stratum fluidity inversion analysis on the stratum inclined shaft pressure measurement while drilling finite element model, and identifying key factors influencing the logging pressure measurement while drilling fluidity based on an analysis result; carrying out numerical simulation on the basis of the identified key factors to obtain a pressure response result of the pressure measurement while drilling, analyzing formation fluidity characteristics under the interaction of the multiple factors, and further determining a fluidity response rule expression of the pressure measurement while drilling under the interaction of the multiple factors; and substituting key factor values in the actual measurement while drilling pressure measurement process into the corresponding while drilling pressure measurement fluidity response rule expression, and further calculating to obtain the while drilling pressure measurement fluidity of the vertical well, thereby realizing the correction of the while drilling pressure measurement fluidity. The method provided by the invention provides a theoretical basis and a technical support for the use of the pressure measuring instrument while drilling.

The utility model belongs to the field of aviation product assembly, and particularly relates to a voltage buildup test tool. If the built-up pressure does not meet the requirement, repeated dismounting and debugging are needed, the operation is tedious, resources are wasted, and an elastic non-metal containing cavity is damaged. The device comprises a simulation pressure buildup weight, a pressure buildup mechanism rotor, a pressure buildup mechanism shell, an air inlet pipe, an air outlet pipe, a pressure buildup barrel, a pressure gauge and a spring. The pressure buildup mechanism shell is of a cubic structure, a cavity is formed in the pressure buildup mechanism shell, the top of the pressure buildup mechanism shell is open, the pressure buildup mechanism rotor is supported on the bottom of the cavity through a spring, and the upper portion of the pressure buildup mechanism rotor is rigidly connected with the simulation pressure buildup weight. An air inlet pipe and an air outlet pipe which are communicated with the cavity are installed on the side face of the pressure building mechanism shell, the air inlet pipe is communicated with an air source in a sealed mode, the air outlet pipe is communicated with the pressure building barrel in a sealed mode, and the internal pressure of the pressure building barrel is detected through a pressure gauge. A multi-overload-value voltage buildup test can be simulated, the passing rate of final test on centrifugal equipment after a complete product is assembled is improved, resources are saved, and the assembly process is simplified.

The invention provides a transient productivity prediction method based on a fracture-vug reservoir pressure recovery well test model, and relates to the technical field of oil and gas reservoir development. The prediction method comprises the following steps: S1, through fracture-vuggy reservoir pressure recovery well test interpretation, establishing a fracture-vuggy reservoir well test geologic model, and obtaining reservoir parameters; s2, establishing a bottom hole pressure calculation equation under a constant flow condition, and calculating bottom hole pressure by adopting a multi-stage flow superposition principle; s3, establishing a yield calculation equation under the condition of the fixed bottom hole pressure to obtain data of flow changing along with time under the fixed bottom hole flow pressure; s4, forming a productivity prediction method that both the yield and the bottom hole pressure change along with well testing, and establishing a productivity calculation equation of the yield and the pressure when both the pressure and the flow change based on a Duhanm principle to realize transient productivity calculation prediction; therefore, a new productivity prediction method suitable for the fracture-cavity type oil reservoir is formed. The long-term production pressure and yield change of the oil well can be predicted more accurately, and development and production allocation are guided.

A vehicle brake system, includes a brake fluid control assembly and a brake master cylinder assembly. The brake fluid control assembly a manifold block, and a pressure buildup device mounted at the manifold block. The brake master cylinder assembly is in communication with the manifold block. The brake master cylinder assembly and the pressure buildup device drive brake fluid to be output via the manifold block. A central axis of the brake master cylinder assembly is non-perpendicular to a first axis along a movement direction of a piston of the pressure buildup device.

This application relates to a hydraulically controlled water supply on / off device and its control method. The device includes a pressure reducing valve, a pilot valve, and a solenoid valve. The solenoid valve is disposed on the connecting pipeline between the outlet side of the pilot valve and the outlet side of the pressure reducing valve. When the solenoid valve is open, the valve plate of the pressure reducing valve separates from the valve body under the pressure of the water at the inlet side of the pressure reducing valve, and the pressure reducing valve opens. When the solenoid valve is closed, the pilot valve controls the valve plate of the pressure reducing valve to move downward, and the pressure reducing valve closes. This device controls the opening and closing of the solenoid valve by receiving the unit's operating status signal to isolate or open the pilot valve channel, thereby automatically controlling the opening and closing of the pressure reducing valve using hydraulic action. This achieves reliable on / off control of the technical water supply system, effectively avoiding the opening and closing failures caused by pressure buildup in traditional electric isolation valves. Furthermore, by replacing the high-energy-consuming electric valve with a low-power solenoid valve, the system's energy consumption is significantly reduced.

The invention discloses an integrated braking system and a detection method. The integrated braking system comprises a liquid storage pot; the liquid storage pot is connected with the pedal simulation unit and the pressurizing unit, and the pedal simulation unit is connected with the braking unit through a first hydraulic loop and performs hydraulic braking control on the braking unit; the pressurizing unit is connected with the first hydraulic loop through a second hydraulic loop and is used for loop detection; the first hydraulic loop and the second hydraulic loop which are connected through the pedal simulation unit and the pressurization unit are used for detecting the hydraulic loop of the integrated braking system, whether the pressure buildup capacity, the air amount and the sealing performance of the integrated braking system meet preset threshold values or not is judged, a vehicle with problems can be detected in a whole vehicle manufacturing plant, and the integrated braking system can also be used for an after-sale maintenance end. And detecting the brake system after the brake system is maintained.

The utility model relates to a sidetracking whipstock orientation pulse signal transmission device which is sequentially provided with a setting mechanism, a pressure building mechanism, an anchoring mechanism, a whipstock, a drilling and reaming type composite drill bit, a drill bit short section, an orientation short section and a non-magnetic drill collar from bottom to top, and an MWD orientation device is installed in the non-magnetic drill collar. A large piston is arranged at the upper end of a central channel of the orientation short section, a small piston is screwed at the lower end of the large piston, and the large piston is communicated with a central hole of the small piston; piston shear pins are symmetrically arranged on the circumference of the middle section of the orientation short section, and the inner ends of the piston shear pins are embedded into the circumference of the middle of the small piston; a plurality of circulating holes communicated with the central hole channel and the annulus are symmetrically formed in the circumference of the lower part of the orientation short section; and an inner port of each circulating hole is positioned below the small piston. According to the device, the orientation of the downhole tool can be accurately measured without purchasing an expensive gyroscope, the accurate windowing orientation is ensured, and the investment and the operation period are greatly reduced.

The first aspect of this application provides a distribution plate, including a mixing chamber, a first inner hole, and a second inner hole. The mixing chamber is disposed within the distribution plate and is used to provide mixing space for an accelerator and compressed air. The first inner hole communicates with the mixing chamber and is used to deliver compressed air into the mixing chamber. There are three second inner holes, one of which is used to deliver the accelerator to the mixing chamber, and the other two are used to connect the mixing chamber to a mixer. The inner diameter of the mixing chamber is larger than the inner diameters of the first and second inner holes. The large space of the mixing chamber provides sufficient mixing space for the compressed air and the accelerator, allowing them to mix thoroughly, reducing the probability of pressure buildup, and thus ensuring the uniformity of the mixing medium and concrete. This ensures the continuity and stability of the concrete head sprayed by the wet shotcrete machine, thereby reducing the concrete drop rate and rebound rate. The second aspect provides a wet shotcrete machine that includes the distribution plate of the first aspect.

The invention discloses a braking system of a vehicle and the vehicle, and relates to the field of vehicles, a main braking unit comprises a first control valve, a second control valve, a first driving part and a pressurizing part, and a redundant braking unit comprises a third control valve, a fourth control valve, a second driving part and a liquid pumping part; the pressurizing piece, the first control valve and the third control valve are sequentially connected to form a first oil way, and the first driving piece is configured to press oil in the first oil way into the wheel brake; the liquid storage container, the second control valve and the fourth control valve are sequentially connected to form a second oil way, the liquid pumping part is arranged on the second oil way, and the second driving part is configured to pump oil in the liquid storage container into the wheel brake. Therefore, by selectively conducting one of the first oil way and the second oil way, decoupling of the main braking unit and the redundant braking unit can be achieved, the pressure buildup response speed of the main braking unit and the redundant braking unit is increased, and improvement of the braking performance of the vehicle and the driving safety of the vehicle is facilitated.

The invention provides a rock fracture permeability calculation method and device, electronic equipment and a storage medium, and belongs to the technical field of oil-gas exploration and development. The method comprises the steps that the rock fracture average opening degree of a target interval is calculated according to imaging logging interpretation; analyzing and calculating the dynamic rock fracture opening degree of the target interval according to the pressure recovery well test; calculating a crack opening correction coefficient according to the rock crack average opening and the dynamic rock crack opening; and calculating the rock fracture permeability according to the fracture opening correction coefficient and the rock fracture density. According to the method, dynamic and static data such as imaging logging, pressure recovery well testing and testing are integrated, the crack opening correction coefficient is introduced, the rock crack permeability is calculated, and the rock crack permeability can be obtained more accurately.

The utility model provides a pipeline isolator. The pipeline isolator comprises a fixing frame, a bag body and a through pipe. The fixing frame comprises a groove. The bag body is embedded in the groove, and the fixing frame and the bag body are used for being connected with a pipeline in a sealed mode. The through pipe is connected with the fixing frame and penetrates through the inner side and the outer side of the fixing frame. The isolating device solves the problem of pressure building of an existing isolating device.

The utility model discloses an integrated double-cylinder nitrogen shock absorber structure which comprises an outer oil storage cylinder and an inner oil storage cylinder, the outer oil storage cylinder is sleeved outside the inner oil storage cylinder, an oil storage groove is formed between the outer oil storage cylinder and the inner oil storage cylinder, an oil passing hole is formed in the inner wall of the inner oil storage cylinder and communicated with the oil storage groove, and a sealing assembly is arranged at one end of the outer oil storage cylinder. One end of the oil storage inner cylinder is provided with a piston, the other end of the oil storage inner cylinder is provided with a valve seat, the valve seat is internally provided with a compression high-speed valve system for sealing the oil storage inner cylinder, the valve seat is externally provided with a compression regulating valve assembly, the valve seat is internally provided with a buffer cavity, the buffer cavity is communicated with the oil storage inner cylinder and the compression regulating valve assembly, and the buffer cavity is internally provided with a floating piston; the buffering cavity is sealed through a lower connecting fork assembly. According to the utility model, the adjustability of the damping force value of the low-speed section can be met, the damping force value of the low-speed section is reduced, and the comfort of paving a road surface or a road surface with small vibration is met; and the large-damping-force-value requirement of the extreme cross-country working condition can be met, and the advantages of being fast in pressure building, high in universality and the like are achieved.

The utility model relates to the technical field of pressure increasing assembly, especially for hydraulic system piston type slow pressure increasing assembly, including device frame, the inside of device frame is equipped with pressurizing component, the inside of device frame is equipped with adjusting component, pressurizing component includes push disc, the front side end fixed mounting of push disc has push rod, the outer surface fixed mounting of push rod has movable plug, the outer surface of movable plug is equipped with the oil tank of passing through, adjusting component includes adjusting cavity, the inside of adjusting cavity is equipped with a plurality of adjusting grooves, and the both ends section area of adjusting groove is different, and gradually becomes bigger from left to right. The device can inject hydraulic oil into the oil cavity, push the push rod to move forward, make movable plug move forward, change the fit position of movable plug and adjusting cavity constantly, change the flow area, change the push amount of hydraulic oil when the device is used, reach the effect that slow pressure increases, improve the practicality of device.

This utility model provides a splash-proof and corrosion-resistant drying oven, including a drying chamber with a component chamber inside. A cover plate is fixedly installed at the top of the drying chamber. A material corrosion-resistant tank is located inside the component chamber, and a connecting pipe is installed at the top of the material corrosion-resistant tank, extending upwards and penetrating the cover plate. This design utilizes a tapered input cavity with a gradually decreasing cross-sectional area to increase the material flow rate and create a negative pressure zone, suppressing pressure buildup. The symmetrically arranged exhaust pipes on both sides can directionally discharge the overpressure steam generated by material vaporization, preventing excessive pressure from causing material to splash from the input port. Furthermore, the material corrosion-resistant tank is made of 316L stainless steel or titanium alloy and undergoes electrolytic polishing to eliminate microporous corrosion sources on the inner wall, significantly improving its resistance to corrosive materials and extending the equipment's service life.

The invention provides a compressed air energy storage container pressure buildup stage model building and simulation method and system, and the method comprises the steps: dividing an energy storage process into an initial pressure buildup stage, an initial pressure buildup stage and an air compressor pressure supplement stage after multiple cycles; a steam-water mixing container and a high-pressure gas storage container are divided into four parts, namely a gas control body, a liquid control body, a device wall control body in contact with gas and a device wall control body in contact with liquid, and six assumptions are combined; mathematical models (including a gas state equation, a water body control body energy equation, a device wall control body energy equation and the like) of all stages are established on the basis of the law of conservation of energy and the law of conservation of mass respectively, curves of pressure and liquid level changing along with time are obtained through simulation calculation, and the curves are compared with experimental results for verification. According to the method, the multi-physical field coupling effect is comprehensively considered, the dynamic characteristics of the gas storage container can be accurately reflected, and a reliable theoretical basis is provided for system design and engineering application.

The utility model provides a lubricating system for rapid pressure buildup of a main oil duct, and relates to the technical field of engine lubricating systems. The filter comprises a mounting base, a plurality of filter cartridges are detachably arranged on the mounting base, convex grooves protruding outwards are formed in the opposite faces of the side walls of the filter cartridges, movable limiting pieces are arranged in the convex grooves, filter pieces are arranged in the filter cartridges, and the filter cartridges are detachably connected with the movable limiting pieces. The movable limiting part is used for limiting the filtering part so that the filtering part can be detachably connected with the filtering cylinders, each filtering cylinder can be provided with a connecting pipe, the adjacent filtering cylinders are communicated with each other, and the connecting pipes are communicated with an engine oil channel of an engine. Through the arrangement of the movable limiting piece, detachable connection between the filtering piece and the filtering cylinder is achieved, in this way, only the filtering piece needs to be replaced during replacement, the follow-up maintenance and replacement cost of the engine is reduced, and then the cost output by consumers in follow-up maintenance is reduced.

The utility model provides a wellhead blowout preventer pressure testing device which comprises a pressure testing device body, a pressure testing channel and a pressure releasing channel which are not communicated with each other are defined in the pressure testing device body, the pressure testing device body is provided with a pressure testing connector installation part and a pressure releasing connector installation part, and an inlet channel is arranged in the pressure testing connector installation part. A side wall through hole is formed in the side wall of the pressure testing device body, the pressure testing channel is communicated with the inlet channel and the side wall through hole, and the pressure releasing channel is communicated with a pressure space in an original well pipe column well. The contact sleeve sleeves the outer wall surface of the pressure testing device body and is used for being in sealed connection with a semi-sealed flashboard of the blowout preventer; the pressure test inlet joint is arranged on the pressure test joint mounting part and is used for connecting a pressure test pump; and the pressure release joint is arranged on the pressure release joint mounting part. The blowout preventer pressure test device can perform pressure test operation on the blowout preventer in the workover operation, and can release the pressure in the well in the pressure test process, so that pressure accumulation is avoided, and the safety of the workover operation is improved.

The utility model relates to the technical field of axial flow Kaplan turbines, in particular to a rotating wheel pressurizing operation device for a rotating wheel assembly test tool, which comprises a plurality of pressurizing pipes, a plurality of oil return pipes, a plurality of connecting pipes and a plurality of valves, the head ends of the pressurizing pipes are connected with a servomotor open cavity, a rotating wheel inner cavity and a servomotor closed cavity in a one-to-one manner, and the connecting pipes are connected with the connecting pipes. Oil return pipes are respectively connected to the pressurizing pipes in parallel, one end of each oil return pipe is communicated with the corresponding pressurizing pipe, the other end of each oil return pipe is communicated with the corresponding second connecting pipe after being connected in parallel, and valves are respectively and correspondingly arranged on the pressurizing pipes and the oil return pipes. The device and a test tool form a test system, oil injection and pressure boosting of three cavities can be realized by switching opening and closing of the valves, the problem of pipeline pressure building can be solved by adjusting the opening degree of the valves, all tests can be completed by one-time installation, repeated disassembly and assembly are not needed, the structure is simple, and the test efficiency and the test safety are greatly improved.

The present invention relates to a high-pressure common rail fuel system diagnosis method, device, electronic device and storage medium, belonging to the technical field of high-pressure common rail fuel system diagnosis. The method includes obtaining operating data of the high-pressure common rail fuel system during operation; the operating data includes an actual rail pressure, a first target rail pressure and a second target rail pressure; controlling the actual rail pressure to increase to the first target rail pressure, and obtaining a pressure increase time, which is used as a pressure buildup time; controlling the actual rail pressure to decrease from the first target rail pressure to the second target rail pressure, and obtaining a pressure decrease time, which is used as a pressure relief time. Therefore, after the high-pressure common rail fuel system is subjected to pressure increase and pressure reduction processing as a whole, the high-pressure common rail fuel system can be diagnosed based on the pressure buildup time and pressure relief time, making the high-pressure common rail fuel system diagnosis process convenient and efficient.

We propose a rust-preventive cover for outdoor tanks equipped with vent pipes, to prevent rust from occurring at the vent pipe mounting area due to rainwater. [Solution] A rust-preventive cover for a vent pipe mounting portion, characterized in that it is made of resin, for covering the vent pipe mounting portion, which is the part where the vent pipe is attached to the boss, in order to prevent pressure buildup inside the outdoor tank used outdoors at normal pressure, the boss attached to the vent pipe, and the vent pipe mounting portion attached to the boss, in order to prevent rust from occurring at the vent pipe mounting portion.

This invention relates to the field of glass production technology, specifically to a system and method for preventing pressure buildup in a gas supply pipeline. The system includes: a pressure vessel containing a pre-set volume of liquid; a pressure sensor and a liquid level sensor mounted on the pressure vessel; and an atmospheric pressure vessel. A liquid inlet at the bottom of the pressure vessel is connected to the interior of the atmospheric pressure vessel via a first connecting pipe, and a drain outlet at the bottom of the atmospheric pressure vessel is connected to the liquid inlet at the bottom of the pressure vessel via a second connecting pipe. An automatic regulating valve is mounted on the first connecting pipe, and a liquid delivery pump is mounted on the second connecting pipe. This invention, through the combination of the pressure vessel and the atmospheric pressure vessel, and by placing a liquid in the pressure vessel, aims to reduce pressure fluctuations in the gas supply pipeline during reversal, thereby preventing overpressure venting.

The invention provides a fractured-vuggy gas reservoir key parameter calculation method and device, computer equipment and a storage medium, and the method comprises the steps: building a basic hypothesis based on a continuum mechanics theory; constructing a well-cave-fracture-cave-fracture calculation model by using the basic hypothesis; obtaining dimensionless variables; curve characteristics of the typical flow stage are obtained; solving the well-cave-fracture-cave-fracture calculation model through dimensionless variables and curve characteristics of the typical flow stage to obtain a dimensionless bottom hole pressure progressive solution of the typical flow stage; performing dimensionalization on the dimensionless bottom hole pressure progressive solution of the typical flow stage to obtain a dimensioned pressure derivative progressive solution of the typical flow stage; and calculating the fracture-cavity gas reservoir key parameters by using the progressive solution of the dimensioned pressure derivative of the typical flow stage. According to the method for calculating the key parameters of the fracture-vug gas reservoir, the key parameters of the fracture-vug gas reservoir are calculated, the multiplicity of solutions of pressure recovery well test interpretation of the fracture-vug gas reservoir is effectively overcome, and the interpretation precision of stratum parameters is improved.

The device comprises a hot melting metal packer connected between adjacent sleeves, the hot melting metal packer comprises a hot melting metal cylinder, the annular area of the hot melting metal cylinder is provided with a circulation hole used for allowing fluid to pass through, and the annular area of the hot melting metal cylinder is provided with a circulation hole used for allowing fluid to pass through. The hot melting metal cylinder is used for being heated and melted into fluid, filling the fluid into a to-be-sealed area and conducting sealing through volume expansion in the curing process. According to the device, potential gas migration and annulus pressure can be prevented, and the effectiveness of cement sheath sealing can be ensured on the basis that well repairing or cement squeezing operation is not needed in the oil and gas well production process. The invention further discloses a method for preventing and controlling annulus pressure of the oil and gas well. The method has the same advantages.

The application discloses a method for simulating the variable well storage effect caused by downhole throttling of a gas well, which comprises the following steps: step 1) establishing a dimensionless wellbore material balance equation under downhole throttling conditions to obtain a dimensionless pressure value under the downhole throttling conditions; step 2) drawing a double-log pressure derivative curve chart based on the dimensionless pressure value in step 1) to simulate the variable well storage effect under different parameter combinations under the downhole throttling conditions; and step 3) making a normalized pseudo-pressure difference and its derivative and a measured curve chart of the shut-in time based on actual pressure buildup data under the throttling conditions, and drawing the measured curve chart on the double-log pressure derivative curve chart in step 2) to keep the measured curve chart coinciding with the double-log pressure derivative curve chart, and solving relevant parameters of the variable well storage stage according to a fitting key point, so that the variable well storage effect caused by the downhole throttling of the gas well is described through the relevant parameters.

The application provides an oil and gas reservoir fracture opening degree prediction method and a related system, and belongs to the technical field of oil and gas exploration and development. Specifically, oil and gas well data and core samples of a target layer are collected. Firstly, a pressure buildup curve is drawn by using the oil and gas well data, and a sudden pressure is determined according to the pressure buildup curve, and a pressure-time linear relationship formula on both sides of the sudden pressure is established, and the average value of the slope is calculated. In combination with the sudden pressure and the average value of the slope, a fracture coefficient is calculated. Meanwhile, the porosity of the core sample is measured and the average value is calculated. In addition, fracture parameters are picked up and interpreted from the oil and gas well data, and a S-wave amplitude value is determined, and the fracture permeability is calculated in combination with the fracture parameters. Finally, based on the fracture coefficient, the average value of the porosity and the fracture permeability, a fracture opening degree prediction formula is established, and the fracture opening degree value is calculated. By obtaining detailed fracture parameters, the natural fracture opening degree prediction accuracy is improved, the reserves and the development potential of the oil and gas reservoir can be more accurately evaluated, and the productivity of the fractured oil and gas reservoir is improved.

The invention provides an automatic pressure building method for a large hydraulic power plant speed regulator hydraulic system. According to the automatic pressure buildup method for the large hydraulic power plant speed regulator hydraulic system, full-process automatic pressure buildup after the hydraulic power plant speed regulator hydraulic system is overhauled can be achieved, the oil level, the oil pressure and the air pressure are monitored in real time, cooperative action of the oil pump and the gulp valve is intelligently controlled, the pressure buildup efficiency and the parameter precision are remarkably improved, and the working efficiency is improved. And manual intervention and operation risks are reduced.

The invention provides a compressed air energy storage container pressure building and energy storage stage model building and simulation method, and aims at solving the problems that in the prior art, multi-physics field coupling is ignored, and dynamic characteristic analysis is insufficient. According to the method, the energy storage process is divided into an initial pressure buildup stage and an energy storage stage, aiming at the initial pressure buildup stage and the energy storage stage, an energy storage container and an acting container are divided into a gas control body, a liquid control body, a device wall control body in contact with gas and a device wall control body in contact with liquid, and six assumptions are combined, so that the energy storage process is optimized. Mathematical models (including a gas state equation, a water body control body energy equation, a device wall control body energy equation and the like) of all stages are established on the basis of the law of conservation of energy and the law of conservation of mass respectively, curves of pressure and liquid level changing along with time are obtained through simulation calculation, and the curves are compared with experimental results for verification. According to the method, the multi-physical field coupling effect is comprehensively considered, the dynamic characteristics of the gas storage container can be accurately reflected, and a reliable theoretical basis is provided for system design and engineering application.