128 results about "Gas holdup" patented technology

The invention relates to a combined measurement method of an electroacoustical sensor for flow parameters of an oil-gas-water three-phase flow. The combined measurement method comprises the steps of successively mounting a pulse transmission type patch shape ultrasonic sensor, an arc-shaped wall facing type conductivity sensor with a protective electrode, and an insertion type conductivity sensor from bottom to top; extracting the gas holdup of the oil-gas-water three-phase flow by means of the transmission type ultrasonic sensor; obtaining related flow velocity of the oil-gas-water three-phase flow by means of the insertion type conductivity sensor; extracting the gas holdup of the oil-gas-water three-phase flow based on a responding signal of the arc-shaped wall facing type conductivity sensor with the protective electrode; and realizing predication of total flow and single-phase flows of the three-phase flow. The combined measurement method can be used for performing effective measurement on the oil-gas-water three-phase flow.

The invention relates to a sapphire optical fiber probe sensor used for measuring gas holdup under an oil well, which comprises a probe, an optical fiber coupler, a light source and a light detector, the probe is a sapphire sensitive probe, the optical fiber coupler is a Y-shaped optical fiber coupler, the light source is infrared source, the sapphire sensitive probe and the Y-shaped optical fiber coupler are sealed in a stainless steel protective casing, and the infrared source and the light detector are sealed in a stainless steel sealed chamber connected to the stainless steel protective casing. The sapphire optical fiber probe sensor used for measuring gas holdup under the oil well has the advantages of high sensitivity, less optical loss, high measurement accuracy, reliable performance, electromagnetic interference resistance, corrosion resistance, oil contamination resistance, high pressure resistance, high temperature resistance, good electrical insulating property, safety explosion resistance, long usage life, exquisite structure, small volume, light weight and less power consumption, and the sapphire optical fiber probe sensor enables real-time and on-line measurement for gas holdup of oil-air-water three-phase flows in a narrow space under the oil well.

The present invention discloses an airlift reactor assembly with a helical sieve plate, comprising a reaction tank, wherein a draft tube and a gas sparger are assembled in the reaction tank, the gas sparger is arranged just below an riser section of the draft tube, a helical sieve plate is arranged in the riser section of the draft tube, and a body of the helical sieve plate is helical upwards to guide a part of two / three-phase flow in the riser section, and the body of the helical sieve plate is provided with a plurality of sieve meshes to guide the remaining two / three-phase go through the helical sieve plate in the riser section and to break bubbles. The present invention gives consideration to both macroscopic mixing and microscopic mixing processes. In addition to driving liquid to circularly flow by using ejected gas, the helical sieve plate can be used for breaking large bubbles into small bubbles thereby effectively preventing the bubbles from coalescing, increasing gas holdup and increasing a volumetric oxygen transfer coefficient.

The invention discloses a coal rock pressure-maintaining coring inner barrel. An inner rubber sleeve is inserted into an outer tube of a rock core holding barrel, a confining pressure cavity is formedbetween the inner rubber sleeve and the inner wall of the outer tube of the holding barrel, sealing plugs and sealing rings are arranged at the two ends of the inner rubber sleeve, the sealing plug and the sealing ring at the upper end are used in cooperation to seal an upper end opening of the confining pressure cavity, the sealing plug and the sealing ring at the lower end are used in cooperation to seal a lower end opening of the confining pressure cavity, one end of an upper end connecting piece is connected with the upper end of the rock core holding barrel in a sealed mode, the other end of the upper end connecting piece is connected with a pressure supply bin, the pressure supply bin is communicated with the confining pressure cavity through a pressure supply pipeline, and a pressure supply valve is arranged on the pressure supply pipeline and used for controlling supply of fluid of reference pressure; and one end of a lower end connecting piece is hermetically connected with the lower end of the hollow rock core holding barrel, the other end of the lower end connecting piece is connected with a ball valve, an outlet pipeline is arranged at the upper end of the rock core holding barrel, and the outlet pipeline at the upper end is provided with an upper end outlet valve. By means of the coal rock pressure-maintaining coring inner barrel, accurate measurement of the gas content can be guaranteed, and the coal rock stratum condition permeability can be tested without taking out a rock core.

The invention relates to a portable insulating oil gas content detection device and a sealing defect diagnosis method based on gas content; the portable insulating oil gas content detection device comprises a case with an upper cover on the case body; the case body internally comprises a gas source module, a chromatographic analysis system, a carrier gas cylinder, a standard gas cylinder and a chromatographic analysis workstation system; the gas source module provides hydrogen and air for the chromatographic analysis system; the chromatographic analysis system is used for completing oil-gas separation and chromatographic analysis of the insulating oil; the carrier gas cylinder and the standard gas cylinder are respectively used for providing carrier gas and standard gas for the chromatographic analysis system; and the chromatographic workstation system is used for realizing equipment sealing defect diagnosis based on gas content data after data acquisition and analysis. According to the invention, automatic calibration of gas component distribution coefficients in the insulating oil is achieved through the internal automatic degassing module, automatic analysis of the content and gas content of dissolved gas components in the oil is achieved, the test precision and accuracy are greatly improved, the detection device can be applied to live and continuous on-site online monitoring of laboratories and equipment, and multiple purposes are achieved through one machine.

A full bore spectral gas holdup tool that measures gas holdup that is corrected for effects of the flowstream lamination and the salinity of the liquid in the a flowstream. The basic methodology utilizes spectral data from two gamma ray detectors at different spacings from a nuclear source that emits gamma radiation. 57Co is the preferred source and the gamma ray detectors are scintillation spectrometers. In addition to a full bore gas holdup measurement, the spectral gas holdup tool also provides indications of the degree of flowstream lamination and the salinity of the liquid in the flowstream. An iterative data processing method optimizes the accuracy of the measured flowstream parameters.

The invention discloses a method for measurement of two-phase flow gas holdup based on an ultrasonic two-frequency signal. The method comprises the steps of: arranging an ultrasonic transmitting probe and an ultrasonic receiving probe respectively at both ends of a section of straight pipeline needing two-phase flow gas holdup measurement; by means of the ultrasonic transmitting probe, generating two ultrasonic signals that are propagated along the fluid in the straight pipeline and have the excitation frequencies of a first excitation frequency and a second excitation frequency respectively; detecting the characteristic parameters of the received two ultrasonic signals by the ultrasonic receiving probe; and calculating the gas holdup according to the first excitation frequency, the second excitation frequency, the pure liquid propagation velocity, the resonant frequency of bubbles in the two-phase flow, the bubble vibration damping and the characteristic parameters of the two ultrasonic signals. The ultrasonic probes are installed on the outer wall of the straight pipeline, and are not needed to be arranged in the two-phase flow in the pipeline, thus realizing non-contact measurement of the two-phase flow gas holdup. The data processing amount is very small, and flow of the two-phase flow in the pipeline is not hindered in the measurement process.

The invention relates to a multi-scale bubble generating method and device suitable for enhancing mass transfer in a slurry bed. The method comprises the following steps: inferior residual oil enters the bottom of a reactor from a liquid phase inlet located in the bottom of the slurry bed, and premixed hydrogen passes through a primary distributor to form a gas-liquid mixture at the bottom of the reactor; the inferior residual oil and the pre-mixed hydrogen enter diversion inlets of spray nozzles; the residual oil and hydrogen entering the spray nozzles are ejected from outlets of the spray nozzles to generate microbubbles, and the generated premixed hydrogen microbubbles rises along with flow of a liquid phase; and in addition, additional hydrogen enters a directional bubbling device, and larger bubbles generated by the bubbling device and the microbubbles generated by the spray nozzles are uniformly mixed and rise. According to the method provided by the invention, the hydrogen is dispersed into the residual oil in the form of coexistence of the microbubbles and the large bubbles, so that the gas holdup rate in hydrogenation of the residual oil in the slurry bed is improved, and the progress of the hydrogenation reaction is promoted.

The invention discloses a multilayer nested cavitator capable of forming large-range cavitation. The multilayer nested cavitator mainly comprises an inlet section used as a flow distribution cavity, and through which a fluid enters the spaces of the various layers of the nested cavitator respectively, a nested tube section composed of two or more coaxial Venturi cavitators, and used for creating necessary pressure conditions for generation of liquid cavitation, an outlet section through which liquids from the various layers of cavitators are collected and flow out of the cavitators. The multilayer nested cavitator disclosed by the invention is capable of effectively expanding the action range of cavitation. A numerical simulation result indicates that compared with a single Venturi cavitator, the average gas holdup is increased by more than 5%, and the total volume of a gas in a cavitation area is increased by more than 16% under the same flow and pressure difference condition.

A process for dewatering an aqueous suspension of microalgae is disclosed in which the aqueous suspension of the algae is introduced into a bubble column or a modified bubble column for generating a froth of bubbles and adsorbed algal cells that can be separated from the aqueous suspension. In one advantageous embodiment, the bubble column is a multi-stage loop-flow flotation column that has three loop-flow zones, each of which is defined by a draft tube concentrically mounted in the column to divide each loop-flow zone into a riser and the downcomer. Fine bubbles of gas and brine are in cocurrent upward flow in the riser and in cocurrent downward flow the downcomer. A higher gas holdup is promoted in the riser than in the downcomer, thereby circulating the brine in loop-flow upwardly through the riser and downwardly through the downcomer. Liquid communication between adjacent loop-flow zones is substantially eliminated. A froth enriched in algae is generated that can be separated from the aqueous suspension. The process has application in the recovery of mixed carotenoids from Dunaliella salina.

The invention discloses a method for discontinuously acquiring underground pressure pulse of an inflatable bored well, which not only can acquire underground pressure pulse, but also can lead a downhole to be in an underbalance state. The method comprises the steps as follows: A, gradually increasing aeration quantity under no change of liquid injection quantity, wherein no pressure pulse feedback signals exist underground, the maximum gas holdup rate under the conditions is of a critical gas holdup upper limit; B, switching on a release valve, stopping gas ejection and injecting drilling fluid when detection equipment can not receive the signals, calculating reasonable gas stop time, and if the limit gas stop time within the maximum gas holdup rate range allowed of an instrument ensures the underground underbalance, acquiring underground pulse signals, otherwise, replacing measurement while drilling equipment with a higher gas holdup rate threshold value; and after the detection equipment receives the pulse signals, switching off the release valve, and ejecting the gas by equal gas ejection quantity at the last gas stop moment. By adopting the steps, the underground parameters can be accurately acquired, the drilling efficiency can be improved, and safety and fast well drilling on the guiding site can be achieved.

The invention relates to a method for calculating a gas phase flow by utilizing a gas holdup of a low-yield gas well. The method is characterized in that a hydrodynamic parameter calculation model under a flowing state is especially practically established according to a basic multiphase flow theory model. The method comprises the following steps according to the conditions: S1) collecting the related data of the gas well, including gas holdup, pipe diameter, gas and liquid density, gas and liquid surface tension and local gravitational acceleration; S2) judging gas and liquid two-phase flow type, wherein when the gas holdup is less than 0.8, the flow is static liquid and is a gas upward flowing foamy flow, and when the gas holdup is more than 0.8, the flow is a gas-carrying-water sectional blocking flow; and S3) utilizing a gas flow formula to calculate a gas phase flow QG of a low-yield gas-carrying-water well according to a judging result of the step S2). According to the method provided by the invention, the gas phase flow of the low-yield gas-carrying-water well can be calculated; a new physical model system is established; the calculation result is accurate; and the method can effectively meet the onsite requirement.

The invention relates to an imaging measurement method for the gas holdup of the gas-liquid two-phase flow of a single optical fiber array sensor, which includes the following steps: 16 single opticalfiber sensors are placed in a measurement pipeline with a diameter of 20mm, wherein the 16 single optical fiber sensors are distributed in four annular positions of different cross sections of the measurement pipeline; and after the output signals of the 16 single optical fiber sensors are acquired at the same time, original signals are converted into corresponding square wave signals by a self-adjusting double threshold method, the gas holdup is calculated by the square wave signals, the distribution of gas holdup in the cross sections of the pipeline is imaged by using a cubic spline difference algorithm, and the distribution characteristics of gas holdup of the gas-liquid two-phase flow in the cross sections of the pipeline are reconstructed.

The invention discloses a method for reducing coking materials of an ethylene cracking furnace, and mainly solves the problem that high polymers entrained by dilution steam cannot be removed in the prior art. In the method provided by the invention, quenching is performed on cracking gas generated by the ethylene cracking furnace; oil washing is performed; then obtained cracking gas enters a waterwashing tower; process water in the kettle of the water washing tower enters a process-water stripping tower; and the water in the process-water stripping tower enters a process-water extraction rectifying tower, and is in full contact with an extraction agent and water vapor for ''gas phase-oil phase-water phase'' three-phase mass transfer, wherein when the gas-phase speed in the process-water extraction rectifying tower is 0.05-0.20 cm / s and the dispersion phase speed is 0.30-0.80 cm / s, a technical scheme with a gas holdup in a range of 0.02-0.05% and a liquid holdup in a range of 0.15-0.35% solves the problem well, and can be used for the convection section and radiation section of the cracking furnace.

The invention discloses a sliding bearing performance test experiment table in an oil film cavitation state. The performance test experiment table comprises a main body structure and an oil-gas loop.In the main body structure, a metal bearing bush of a sliding bearing is replaced with a transparent organic glass bearing bush so that a high-speed camera can conveniently shoot a change of a gas content in an oil film of the sliding bearing in real time, and the change of the performance of the sliding bearing is obtained through an added sensor; and in order to realize the oil film cavitation condition, a set of oil-gas loop system is designed, and gas-containing oil is filled into the sliding bearing in an operation process so that real-time measurement of an influence of the oil film on the performance of the sliding bearing under the cavitation condition is realized.

The invention relates to a turbulence generator, in particular to a turbulence generator for a medium-consistency paper pulp pump. The turbulence generator is mounted at the front end of a pump impeller; the turbulence generator and the pump impeller are arranged on the same shaft; and the turbulence generator consists of a hub and a spiral blade fixed on the hub. The turbulence generator is characterized in that the spiral blade consists of an inlet surface, a work surface, a back surface, an outlet surface and an outer edge surface; the work surface is a three-dimensional space curved surface and consists of an inlet side, a blade edge section line and an outlet side; the back surface is formed by thickening the work surface at equal thickness; the inlet side is perpendicular to the axial direction; the outlet side is also perpendicular to the axial direction; and the inlet side and the outlet side rotate for an angle in the circumferential direction to form a blade wrap angle. According to the turbulence generator disclosed by the invention, the fluidizing and gas separating functions of medium-consistency paper pulp suspension can be realized and the conveying difficult problem caused by lack of flowability and over-high gas holdup of medium-consistency paper pulp is solved.

The invention belongs to the technical field of chemical reacting equipment and relates to a reaction tower. Tower bodies adopt a multiple-segment structure, and adjacent tower bodies are connected with each other through a flange and a bolt. At least two layers of mixed reaction devices are arranged in each tower body, and a gas-phase discharging port is formed in the top of each tower body. A liquid-phase feeding port is formed in a position near the top of each tower body and a feeding distributor is arranged at the liquid-phase feeding port. A liquid distributor is arranged on each layer of mixed reaction device, and a liquid redistributor is arranged between the adjacent two layers of mixed reaction devices. A liquid-phase discharging port is formed in the bottom of each tower body, and a position near the bottom of each tower body is provided with a gas-phase feeding pipe which comprises a spray head and a diffusing pipe. The reaction tower has the advantages that uniform distribution of gas and liquid is realized, the full flow and contact of raw materials and the working quality are ensured, the working efficiency is improved and the problems of small gas holdup and low reaction efficiency of a traditional reactor are solved, and is widely suitable for various gas-liquid or gas-liquid-solid reaction processes.

The invention discloses a gas content desorption testing device. The device comprises a first solenoid valve connected with a desorption gas source, a gas and water separation device connected with the first solenoid valve, a second solenoid valve connected with the gas and water separation device, and a gas container connected with the second solenoid valve. The outlet of the gas container is equipped with a third solenoid valve. The gas container is equipped with a pressure measurement device. The pressure measurement device is connected with a data processing system. The first solenoid valve and the second solenoid valve are used for controlling gas inlet, and the third solenoid valve is used for controlling gas discharging. The method and the device can measure a gas volume directly and automatically, and can fit rock samples with different desorption amounts, and the acquisition period is short. The device is advantaged by small power consumption, simple operation and moderate volume, and is suitable for field on-site usage.

The invention discloses a feeding cabin with composite air ventilation structure, comprising a first air inflating mechanism near the discharging hole, wherein the height of the mechanism upward taking the discharging hole as the reference is 0.5-20 times of the diameter of the discharging hole; a second air inflating mechanism adjacent to the first air inflating mechanism, wherein the height in the vertical direction is 0.5-15 times of the diameter of the discharging hole; and a third air inflating mechanism adjacent to the second air inflating mechanism, wherein the height in the vertical direction is 10-60 times of the diameter of the discharging hole; the three air inflating mechanisms are independent and are respectively provided with an air inlet, wherein the ranges of the superficial gas velocity of the three air inflating mechanisms are respectively 1-60 mm / s, 1-50 mm / s and 0-10 mm / s. The feeding cabin of the invention can raise the gas holdup of the material, and increases the mobility of the material, and avoids the material from bridging on the discharging hole such that it can feed the downstream equipment in integrate flow, high concentration and big mass flow rate way.

An intelligent perpendicular spiral bagging device comprises a storage hopper, an air exhaust barrel is connected with the lower end of the storage hopper, an inner barrel is connected with the lowerend of the air exhaust barrel, a feeding spiral is arranged in the inner barrel, a lifting outer barrel is further arranged below the air exhaust barrel, a lager range finder is arranged at the upperend of the outer side of the lifting outer barrel, the lifting outer barrel penetrates through the interior of a weighing mechanism, the weighing mechanism is fixed to a lifting frame, the lifting frame is driven by a lifting motor, the lifting motor is provided with a rotary coder and a frequency converter, the air exhaust barrel is connected with an outlet of an electrical proportional valve, the electrical proportional valve can automatically adjust the negative pressure value at an outlet end according to an input electric signal, an inlet of the electrical proportional valve is connectedwith a negative pressure exhaust system, a sensor signal of the weighing mechanism is transmitted to a weighing instrument, the weighing instrument transmits a weight signal to a PLC control system, and the PLC control system is responsible for coordinating and controlling all actions of the whole device. The intelligent perpendicular spiral bagging device can achieve a good exhaust effect and weighing precision under the premise that the air content of materials changes constantly and achieves intelligent packaging.

The invention provides a microorganism fermentation process scaling-up platform technique. In the process of fermentation, symbolic metabolites are chosen to reflect the growing state of microorganisms and the condition of fermentation medium, and by controlling the change of the symbolic metabolites, and combined with hydromechanics to calculate, design and improve the size and structure of a stirring reactor, the gas holdup is increased and the concentration of the symbolic metabolites is decreased; and fermentation conditions are optimized and the fermentation process is scaled up. The technique is applied in the production of glutathione and S-adenosine-L-methionine and the coproduction of glutathione and ergosterol by brewing yeast fermentation and the production of hyaluronic acid by streptococcus zooepidemicus fermentation. The symbolic metabolites are ethanol, glycerin, lactic acid and acetic acid. The technique ensures that the concentration of ethanol in the high-density aerobic fermentation of yeast is less than 0.5 percent and that the concentration of lactic acid as the symbolic metabolite in the production of hyaluronic acid by bacterial fermentation is less than 3 percent. The technique is easy to operate, and the automation degree is high; and the application range is wide, and the technique can be used in the yeast system as well as the bacteria system.

The invention provides a fresh concrete gas content detection device under a vibration condition, belongs to the technical field of construction material detection equipment, and aims to accurately measure the gas content of fresh concrete. An upper semi-cylindrical container and a lower semi-cylindrical container are in detachable sealed connection; a water level indicator is connected with the upper port of the upper semi-cylindrical container; a stirring paddle is arranged in the lower semi-cylindrical container; the lower end of the center tube of the stirring paddle penetrates through the center through hole of the lower semi-cylindrical container and is arranged in a coupler; the coupler is connected with a motor output shaft; the center tube of the stirring paddle and the lower surface of the center through hole of the lower semi-cylindrical container are sealed by virtue of a sealing component; the head of a vibration hammer is arranged on the upper side inside the center tube of the stirring paddle, and the handle of the vibration hammer is arranged in the coupler and positioned at the lower end of the center tube of the stirring paddle; the coupler and the handle of the vibration hammer are connected or separated along the radial direction by means of plugging in or drawing out a pin I; and the coupler and the center tube of the stirring paddle are separated or connected along the radial direction by means of drawing out or plugging in a pin II. The device is used for detecting the gas content of fresh concrete under a vibration condition.

The invention particularly relates to a technology for preparing special foxtail millet (or proso millet) flour by using foxtail millet (or proso millet) as the main raw material. The flour has the characteristics of favorable conglobation property, favorable extensibility, strong gas holdup force and high toughness, and can be used for processing foxtail millet noodles, dumplings, bread, steamed bun and cakes in a domestic manual or modernized mechanical way, thereby achieving the goal of increasing edible foxtail millet. Meanwhile, the foxtail millet has rich nutrition, and is beneficial to health when being mixed with auxiliary materials, such as corns, pumpkins and the like, and thus, the invention provides an economically affordable new technology for preparing flour from foxtail millet.

The invention provides a non-hydrogenated and low-saturated non-dairy cream composition which comprises, by weight, 1-10 parts of alcohol soluble protein compositions, 5-45 parts of vegetable oil, 0.5-5 parts of oil soluble emulsifiers, 55-90 parts of water and 0-10 parts of optionally selected additives. The invention further provides a preparation method of the cream composition. By the aid of the alcohol soluble protein compositions, the non-dairy cream taking high-unsaturated vegetable oil as a main oil-base component can be prepared. The non-dairy cream has the advantages that the cream has stable gas holdup performances and wide pH (potential of hydrogen) application ranges and can meet requirements of cream products for plasticity and hardness of the cream.

The invention relates to a method for measuring apparent density and gas content of a material. The method comprises the following steps that the volume V of a material cylinder is calibrated; the front end of a gas cylinder is blocked, a piston is pushed to the foremost end, a piston rod is pulled, an air pressure detection device displays that the air pressure is 1 / 2 of the instant atmospheric pressure, air suction is stopped, and a zero point is calibrated; the material cylinder is filled with a material, the piston rod is pulled, the piston is pushed to the foremost end, the piston rod ispulled, the air pressure detection device displays that the air pressure is 1 / 2 of the instant atmospheric pressure, air suction is stopped, and the volume V1 of air in the material cylinder is measured; the weight M1 of the material in the material cylinder is weighed; and the apparent density of the material is calculated according to a formula of M1 / (V-V1), and the gas content of the material is calculated according to a formula of V1 / V*100%. According to the invention, the method is rapid in measurement, simple and easy to operate, and small in error.

The invention discloses a full-automatic test system for gas content of shale. The full-automatic test system comprises a first gas collecting device, a second gas collecting device and a valve position switching device, wherein the first gas collecting device and the second gas collecting device are both connected with the valve position switching device; the valve position switching device is connected with a water feeding device and a shale desorbing device; the first gas collecting device and the second gas collecting device are alternately connected with the water feeding device and the shale desorbing device through the valve position switching of the valve position switching device, so that the continuous water draining and gas collection can be realized between the first gas collecting device and the second gas collecting device; the valve position switching of the valve position switching device is controlled by a controller; liquid level sensors are arranged in both of the first gas collecting device and the second gas collecting device; the liquid level sensors are used for acquiring the water level elevation and transmitting to the controller in the manner of measuring the pressure difference of the shale gas and water in the process of water draining and gas collection. The full-automatic test system for gas content of shale disclosed by the invention has stable and reliable performances, meets the design requirement, is high in accuracy, is high in reproducibility and high in degree of automation and has wide application prospect.

The invention relates to the technical field of nuclear safety and nuclear system detection, in particular to a pressurized water reactor nuclear power station primary circuit total gas content measuring device which comprises a shielding protective cover, and a sampling assembly and a sample measuring assembly which are detachably connected with the shielding protective cover. The sampling assembly comprises a sampling bottle; a valve I connected with a bottle opening of the sampling bottle through a pipeline; a valve II connected with the other bottle opening of the sampling bottle through apipeline; a first quick female joint connected with the valve I through a pipeline; a second quick female joint connected with the valve II through a pipeline; and a balance pipeline, wherein one endof the balance pipeline is connected with the pipeline located between the valve I and the first quick female joint, and the other end of the balance pipeline is connected with the pipeline located between the valve II and the second quick female joint. The total gas content measuring device is convenient to disassemble and assemble, convenient to carry, capable of rapidly sampling and accuratelymeasuring the total gas content of the primary loop, and can be effectively used for detecting the gas content of the coolant in the primary loop.

The invention belongs to the technical field of hydraulic system stability, and particularly relates to a method for establishing a mathematical model of a gas dissolution theory of a hobbing shear hydraulic system, which comprises the following steps of: performing calculating to obtain a volume elastic modulus E of hydraulic oil; obtaining the effective volume elastic modulus E of the hydraulicoil; a pressure rise rate and flow expression; obtaining the mathematical model of the pressure rise rate; obtaining the relationship between the variation of the gas and the solubility; obtaining therelational expression of the gas variation; and obtaining the mathematical model s of the gas dissolving distance. According to the method, the mathematical model of the initial gas content and the gas movement distance after valve port cavitation is established; the optimal distance of gradual dissolution of the gas cavitated through the valve port in hydraulic oil is analyzed through the mathematical model, the optimal duct distance from the valve port to the hydraulic cylinder is designed according to the distance, a theoretical basis is provided for solving the problems of cavitation andseal ring damage in the hydraulic cylinder, and the stability of a hydraulic system is improved.

The invention discloses a test method for a desorbing volume of a loss gas in a shale gas well and a device thereof. The device comprises a coring tube and a coring drill bit (11), wherein the coring tube has an outer coring tube wall (1) and an inner coring tube wall (5); a rubber drum (10), a separating plate (12), a liquid sensor (9), a high-pressure trace constant flow pump (6), a control unit (4), a battery (3) and a coring ball (2) are successively arranged in the inner coring tube wall (5) on the upper part of the coring drill bit (11); the high-pressure trace constant flow pump (6) is arranged in the inner coring tube wall (5) through a bracket (7); a pressure sensor (16) is arranged on the bracket (7); the high-pressure trace constant flow pump (6) is connected with a solenoid valve (15) through a liquid draining pipeline (13); a suction port (8) is arranged at the other end of the high-pressure trace constant flow pump (6); a test chamber (14) is formed in the separating plate (12) of the coring tube and the inner coring tube wall (5); a microswitch (17) is arranged on one side of the coring ball (2). According to the invention, the problem of gas loss of the shale gas content test is solved, the test method is direct, simple and reliable and the test cost is low.