146 results about "Permeability measurements" patented technology

The present invention discloses an isolating material air permeability measuring device which comprises a double vacuum sealing structure permeating gas sampling device and an isolation material air permeability measuring device of the current limiting air extraction pipeline, the device comprises a permeation gas sampling device with double vacuum sealing structure, an ultrahigh vacuum system, a mass spectrograph and a calibrating device, wherein the permeation gas sampling device is connected to the mass spectrograph 3, the current limiting air extraction pipeline 6 and the calibrating device 19-24 through the flange 2 and the vacuum valve 4. The device can overcome the defects of low signal-to-noise ratio when the mass spectrum signal of the permeation air is measured and difficulty for measuring the isolation material with low air permeability existing in the existing technique, and has the characters of quick measuring speed, being able to measure the permeability rate of all gases to the isolation material.

An integrated device for in-situ generation and decomposition of hydrate sediments and permeability measurement thereof belongs to the field of measuring the basic physical properties of natural gas hydrates. The device mainly comprises a reaction kettle, a cold store, a scavenging leakage detection system, a temperature control system, a gas supply system, a water supply system, a permeability measurement system and a computer data acquisition system. A compression type design is adopted for the reaction kettle so that different stress states can be simulated. The device has the following advantages that: the cold store and a constant temperature bath are capable of realizing quick and accurate control of temperatures; the gas supply system is quick and convenient to increase and preserve pressures; the data acquisition system has the functions of data storage and real-time analysis; the temperatures, pressures, historical sedimentary conditions and stress states of different hydratesediment reservoirs can be simulated; and a hydrate sediment sample can be integrally taken out in a relatively convenient manner, and can be directly put in a low-temperature high-pressure three-axis tester for the mechanical characteristic testing research. Besides, the device plays an important role in guiding the drilling and safe mining of natural gas hydrates.

The invention relates to a diagenesis simulation experimental apparatus and method. The diagenesis simulation experimental apparatus comprises a rock core clamping mechanism, a heating mechanism, a gas porosity and permeability measurement process, a liquid injection and liquid permeability test process, an automatic continuous outlet-fluid metering and sampling mechanism, a burden pressure boost control mechanism, a fluid physical property detection mechanism and a data acquisition-calculation and automatic control mechanism, wherein, the inlet and outlet of the rock core clamping mechanism are respectively connected with the gas porosity and permeability measurement process and the liquid injection and liquid permeability test process; the heating mechanism is sheathed at the periphery of the rock core clamping mechanism, and the burden pressure injection port of the rock core clamping mechanism is connected with the burden pressure boost control mechanism; the outlet of the liquid injection and liquid permeability test process is connected on the automatic continuous outlet-fluid metering and sampling mechanism; the fluid physical property detection mechanism detects a fluid sample of the automatic continuous outlet-fluid metering and sampling mechanism; and the data acquisition-calculation and automatic control mechanism acquires, records, stores and calculates temperature, pressure and flow rate in an experiment and meanwhile controls operation of the corresponding solenoid valve and the automatic continuous outlet-fluid metering and sampling mechanism according to the experimental status.

The invention discloses a measuring device for gas permeability of a coal rock core. The measuring device mainly comprises a high-pressure gas source module, a core holder module, a circular pressure loading module, a data metering module and a vacuum treating module, which are connected through needle-type valves (3,5,7,9 and 13), wherein the high-pressure gas source module comprises a high-pressure gas bottle (1), a pressure relief valve (2) and a buffer container (4); the core holder module is a core holder (8); the circular pressure loading module is a hand-operated pump (12); the data metering module comprises precision pressure gauges (6 and 10) and a soap bubble flowmeter (11); and the vacuum treatment module is a vacuum pump (14). The measuring device is convenient to operate, has good repeatability of measured data, small experiment error and low cost, and is suitable for the testing field of gas permeability and equivalent liquid permeability of the coal rock core.

The invention belongs to the technical field of irregular oil gas development and production increase, and particularly relates to an evaluating method of oil and gas reservoir seepage by supercritical carbon dioxide fracturing fluid and a method thereof; a carbon dioxide pressurizing and filling system provides carbon dioxide air source and pressure, and is connected with a supercritical carbon dioxide fracturing fluid phase balance reaction system; the supercritical carbon dioxide fracturing fluid phase balance reaction system is linked with a temperature control system in parallel; a core displacement and permeability measuring system is respectively connected with the supercritical carbon dioxide fracturing fluid phase balance reaction system and a return pressure system, so that the fracturing fluid is effected on the core; the return pressure system provides necessary return pressure for experiment, so as to simulate the real formation condition. The device can adjust the experiment temperature and pressure according to different experiments, and exactly determine the damage rate of the supercritical carbon dioxide fracturing fluid core, and study influences of supercritical carbon dioxide fracturing fluid on the core damage rate under different experimental conditions.

The invention discloses a permeability measuring device and method of hydrate-contained sediments under three-axis stress conditions. The measuring device comprises a reaction kettle, a pressure control system, a hydrate saturability measuring system, a permeability measuring system and the like. The pressure control system can synchronously exert axial pressure and peripheral pressure so as to precisely control the axial pressure and the peripheral pressure. The hydrate saturability measuring system reduces the influences on permeation channels to the maximum extent through a flexible time-domain reflection probe. The permeability measuring system detects the pressure variation and liquid outlet volume variation of a pore pressure inlet and outlet in real time so as to automatically obtaining the permeability of samples efficiently and accurately, and artificial errors are avoided. By means of the permeability measuring device and the corresponding measuring method, the permeability simulating experiment of the hydrate-contained sediments under the three-axis stress conditions can be carried out, the simulation data of permeability and saturability of the hydrate-contained sediments under the three-axis stress conditions is obtained, and an effective theoretical basis is provided for the water production and gas production rules of the hydrate depressurizing production process.

The invention provides a mutual correlation technology for measuring permeability stress sensitivity of ultra-low permeability rocks. The technology comprises the following steps: a) an ultra-low permeability rock core of shale or tight sand rock and the like is selected, and processed into a cylindrical sample; b) a cylindrical steel block standard sample is processed for system calibration; c) the measurement of ultra-low permeability is carried out through a periodic oscillation method, the pore medium can employ gas or water, and the measurement result of the steel block is used for calibrating the system; d) the rock core is placed in a clamp holder, and applied with confining pressure and pore pressure, the rock core is saturated, An upstream sine pressure wave is applied and kept constant, the responses of the downstream pressure waves at different confining pressures are measured; e) the downstream pressure waves at different confining pressures are subjected to mutual correlation analysis, the change of permeability with confining pressure is obtained. Combined with a periodic oscillation method for measurement of permeability of ultra-low permeability rocks, pressure waveforms for measurement of permeability are subjected to mutual correlation analysis, the precision of measurement of permeability change is raised, and the problem of measurement of ultra-low permeability stress sensitivity is solved.

The present application provides an apparatus and a method for measuring apparent permeability of a tight rock core, the apparatus comprises: a rock core holder, a first high-pressure injection pump, a second high-pressure injection pump, a micro-differential pressure meter, a micro-flow meter, a first pressure control unit, a second pressure control unit, a first valve, a second valve, a third valve, and a fourth valve; the first pressure control unit comprises: a first pressure-resistant piston container and a second pressure-resistant piston container, both of which are divided into an upper cavity and a lower cavity by a piston, the upper cavities of the first pressure-resistant piston container and the second pressure-resistant piston container are filled with gases and communicate with each other, and the lower cavity of the first pressure-resistant piston container is filled with pump pressure-transmission liquids, and the lower cavity of the second pressure-resistant piston container is filled with experimental fluids.

A portable apparatus and method provide on-site permeability measurements of a core sample extracted from a subterranean reservoir. The portable apparatus is easily and conveniently transported to well locations for use on-site, thereby allowing the core sample to be tested in actual reservoir conditions. The apparatus can simultaneously test incoming liquids and liquids passing through the core sample, and can measure data in the forward and reverse flow directions. The apparatus requires only a single pump to pressurize and inject the liquid into the core sample.

The invention relates to a novel measurement method for permeability coefficients in a rock rheological process. A shaft pressure loading system is connected with a shaft pressure room of a three-shaft pressure room; a confining pressure loading system is connected with a confining pressure room of the three-shaft pressure room; a seepage control system is connected with a liquid emission system; samples are in parallel connection with the seepage control system and the liquid emission system; a computer data acquisition system is connected with the shaft pressure loading system, the confining pressure loading system and the seepage control system respectively; the device further comprises an upper water storage tank and a lower water storage tank; and the upper water storage tank and the lower water storage tank are connected between the seepage control system and the liquid emission system respectively. The measurement method can measure the permeability coefficients in all phases of the rock rheological process under different confining pressures and different deviatoric stress levels. According to the comparison between experimental results of the permeability coefficients in various phases of the rock rheological process and other conventional test methods, the reliability and the effectiveness of the method can be estimated. Compared with the traditional measurement method, the method overcomes the defects of long test process and complex test operation, and has the advantages of short test process, simplicity and convenience in operation and the like.

An instrument assembly for a well casing inspection tool, comprising a main shaft having an extension shaft extending therefrom. An instrument head is supported on bearings proximate one end of the main shaft. The rotating instrument head, which includes sensors for measuring wall thickness and caliper of the well casing, provides continuous 360 degree scanning of the interior of the well casing to obtain detailed measurements of the well casing. A motor drives the rotating instrument head through a gear train. A mandrel supported by the main shaft includes exciter coils for wall thickness, caliper, and permeability measurements. A capacitive slip ring couples signals between the rotating instrument head and stationary circuits in the instrument assembly.

The invention is a method of determining all the components of an absolute permeability tensor of a porous medium sample from permeability measurements, obtained for example by placing the sample in a permeameter which is useful for fast determination of permeability anisotropies of rocks and detention of internal heterogeneities. A pressure difference ΔP is applied between the inlet and outlet faces of a laboratory rock sample, with zero flow conditions on the edges parallel to the mean flow obtained by confining it in a sheath under pressure. Starting from conventional permeability measurements in three directions and from the measurements of the two components of the viscous forces transverse to the sample, permeability tensor k can be “inverted” by numerical solution of the corresponding boundary-value problem. Since these quantities can be alternatively obtained from numerical solutions of the same flow in a heterogeneous medium, the method can also be used as an upscaling tool in a reservoir simulator.

The invention discloses a measuring device and a measuring method for measuring gas permeability of a material. The measuring device comprises a gas chamber, a gas accumulation chamber and a high-vacuum chamber, wherein a film of the material to be measured or a thin sheet is installed between the gas chamber and the gas accumulation chamber; the gas chamber is connected with a gas source to be measured and a low-vacuum pump; the accumulation chamber is connected with the high-vacuum chamber through a needle valve; and the high-vacuum chamber is connected with a mass spectra gauge and a super-high-vacuum sucking system. By utilizing the device and the method, after a measured gas which permeates through the measured material is accumulated in the gas accumulation chamber to a relatively large gas quantity, part of the gas is sampled into the high-vacuum chamber to be subjected to mass-spectrometer measurement, so that the sensitivity in permeability measurement is improved; and the longer the accumulation time is, the higher the measurement sensitivity is, for example, the sensitivity in steam permeability measurement can reach the level of 10-7g / m<2>day grade.

The invention relates to an apparatus for assessing the condition of at least one circulating band in a papermaking machine including a permeability measuring device, a moisture measuring device, a fiber web moisture measuring device, an evaluator, a reel-up and an other moisture measuring device. The permeability measuring device measures the permeability of the at least one circulating band. The moisture measuring device measures the moisture contained in the at least one circulating band. The fiber web moisture measuring device measures the moisture of the fiber web. The evaluator combines the permeability, the moisture of the at least one circulating band and the moisture of the fiber web to determine the condition of the at least one circulating band. The other moisture measurement device is coupled to the reel-up, and takes a moisture measurement of the fiber web made by the papermaking machine.

The invention is a method of determining all the components of an absolute permeability tensor of a porous medium sample from permeability measurements, obtained for example by placing the sample in a permeameter which is useful for fast determination of permeability anisotropies of rocks and detention of internal heterogeneities. A pressure difference ΔP is applied between the inlet and outlet faces of a laboratory rock sample, with zero flow conditions on the edges parallel to the mean flow obtained by confining it in a sheath under pressure. Starting from conventional permeability measurements in three directions and from the measurements of the two components of the viscous forces transverse to the sample, a permeability tensor k can be “inverted” by numerical solution of the corresponding boundary-value problem. Since these quantities can be alternatively obtained from numerical solutions of the same flow in a heterogeneous medium, the method can also be used as an upscaling tool in a reservoir simulator.

The invention discloses a hydrate sediment flow solid output measuring device combining an X-CT technology and a measuring method. The measuring device comprises an X-ray penetration type reaction kettle, an X-CT scanning analysis system, a vacuum system, a temperature and pressure control system, a hydrate sample preparation system, a sand production monitoring system and a permeability measuringsystem, wherein through integrated application of a sand production-seepage system under the micro-scale multi-factor coupling effect, the coupling relationship of a reservoir structure and physicalspace-time evolution and flow solid output under the multi-factor collaborative action can be quantitatively described, different hydrate generation modes can be selected according to the experiment requirements, different hydrate occurrence states in natural sediments can be simulated and studied, and the device and the method can be used for researching the space-time evolution characteristics of a sediment pore structure under the hydrate convergence and divergence and effective stress conditions and an influence rule of the space-time evolution characteristics on sediment flow solid output, so that the theoretical bottleneck of the hydrate reservoir structure and a physical evolution and flow solid output mechanism in a hydrate production process is broken through, and the device and the method have important engineering significance to deeply understand a depressurizing production law of the South China Sea, practically improve the biogas production efficiency and perfect a depressurizing production technology system.

The invention discloses a system and a method for testing a gas-water permeability saturation curve. The system comprises a core holding unit. A first pressure return valve, a working medium bottle, acirculating pump and a heater are connected in series between a confining pressure outlet end and a confining pressure inlet end of the core holding unit; a first parallel pipeline, a second parallelpipeline and a third parallel pipeline are arranged at an inlet end of the core holding unit, the first parallel pipeline is connected to an intermediate container and a constant-speed constant-pressure pump, and the second parallel pipeline is connected to a humidifier, a pressure stabilizer, a pressure reducer and a gas cylinder; an emptying valve is arranged on the third parallel pipeline; a first parallel pipeline and a second parallel pipeline are arranged at an outlet end of the core holding unit, the first parallel pipeline is connected to a vacuum pump, and the second parallel pipeline is connected to a second pressure return valve and a metering device. The method comprises the following steps: S1, preparation; S2, saturated formation water of a core; S3, gas phase effective permeability measurement in a state of core bound water; S4, gas-water relative permeability measurement; S5, water phase effective permeability measurement in a state of residual gas of the core; and S6,gas-water permeability saturation curve drawing.

The invention discloses an instrument for measuring the relative permeability of a low permeability reservoir using nuclear magnetic resonance. The instrument comprises hardware and software, wherein the hardware comprises a non-magnetic rock sample clamp, a pressure-bearing container, a gas drying device, an electronic balance and a gas flow measurement device; and the software comprises a communication acquisition module, a data arrangement module, a data display module, a data recording module, an experiment process control module and a data exporting module. The instrument can be used for a measurement experiment of the relative permeability of gas and water of a non-conventional reservoir and can accurately provide experimental parameters to achieve the aim of dynamically monitoring the fluid distribution and the flowing rule.

The invention provides a concrete in-situ non-destructive gas permeability measurement method. The device comprises a gas collecting hood, a gas pressure transmitter, a gas quality and flow rate controller, a vacuum pump, a plurality of valves and a controller, wherein the gas collecting hood is used for being bonded on the surface of to-be-tested concrete so as to form a sealed space; the gas pressure transmitter is installed on the outer surface of the gas collecting hood, and is used for collecting the pressure in the gas collecting hood when the gas collecting hood is at the negative pressure state; the gas quality and flow rate controller is installed on a pipeline between the gas collecting hood and the vacuum pump, and is used for detecting and controlling the current gas flow rate; the vacuum pump is used for extracting gases in the gas collecting hood, passing through the gas quality and flow rate controller; the plurality of valves are installed on the pipeline, and are used for controlling the gas on the pipeline to pass through; the controller is connected with the gas pressure transmitter and the gas quality and flow rate controller, and determines the gas permeability of concrete through parameters sensed by the gas pressure transmitter and the gas quality and flow rate controller. According to the device and the method, the permeability can be measured under the negative pressure state; the surface of concrete is not damaged; the measurement process is simple.

The invention relates to a device and method for measuring instantaneous pneumatic pulse permeability of low-permeability rock. The device comprises a confining pressure servo system, a pneumatic servo system and a data acquisition and processing system, wherein the confining pressure servo system can apply 0 to 60MPa of confining pressure to the lateral side of a low-permeability rock sample; the pneumatic servo system consists of an air injection system and an air permeating system; the air injection system can provide 0.1 to 10MPa of high-purity nitrogen; the air permeating system can conduct air permeation tests of two different ranges on a pipeline loop and a steel cylinder loop; and the data acquisition and processing system can real-timely acquire pressure of the rock sample at an inlet and outlet loops, and can be used for drawing a pressure-time curve of the inlet and outlet loops, automatically calculating the permeability of the rock sample, storing and displaying the result. The measurement device provided by the invention can perform permeability measurement tests of rock materials, especially low-permeability rocks, under different confining pressures, has the advantages of simpleness in operation and reliable result, and can display result visually.

The invention provides a method and a device for detecting the dynamic permeability of coal petrography. The method comprises the following steps: acquiring the original permeability parameters of a coal reservoir, the coal petrography permeability measurement parameters and dynamic permeability parameters; establishing a coal reservoir original permeability model according to the original permeability parameters of the coal reservoir; calculating the coal petrography fracture volume compression coefficient of the coal petrography according to the coal and rock permeability measurement parameters and the coal reservoir original permeability model; establishing a coal petrography dynamic permeability prediction model according to the coal petrography dynamic permeability parameters, the coal reservoir original permeability model and the coal a petrography fracture volume compression coefficient; and inputting the coal petrography dynamic permeability parameters of different coal reservoirs under different stress conditions into the coal petrography dynamic permeability prediction model, and generating the coal petrography dynamic permeability. According to the method disclosed by the invention, reliable reservoir physical property parameters are provided for dynamic detection of coal-bed gas well production and parameter optimization of target well sections of a complex structural well, so that the accuracy of detecting the coal petrography dynamic permeability can be improved.

Method of determining the permeability of an underground medium from NMR logs of the permeability of rock fragments from the medium, based on prior calibration of the permeability resulting from this measurements, from direct measurement on rock fragments, such as cuttings for example. The method mainly comprises measuring permeability (k) from rock fragments, measuring the signal produced by a device allowing NMR analysis of the rock fragments previously saturated with a protonated liquid (brine for example), obtaining optimum values for the parameters of a relation giving the permeability as a function of the NMR signal, and applying this relation to the well zones that have already been subjected to NMR logging but for which no direct permeability measurements are available. One example of one of the applications for the present invention is the evaluation of a hydrocarbon reservoir.

An instrument assembly for a well casing inspection tool, comprising a main shaft having an extension shaft extending therefrom. An instrument head is supported on bearings proximate one end of the main shaft. The rotating instrument head, which includes sensors for measuring wall thickness and caliper of the well casing, provides continuous 360 degree scanning of the interior of the well casing to obtain detailed measurements of the well casing. A motor drives the rotating instrument head through a gear train. A mandrel supported by the main shaft includes exciter coils for wall thickness, caliper, and permeability measurements. A capacitive slip ring couples signals between the rotating instrument head and stationary circuits in the instrument assembly.

The invention discloses a low-permeability rock particle penetration rate measuring system and measuring method. The penetration rate measuring system comprises a high-pressure air source device, a reference cavity, a sample cavity, an inlet pressure intensity detecting device, an automatic valve, a ball valve, a pressure difference detecting device and a control device, wherein the automatic valve and the ball valve are sequentially arranged on a pipeline communicating the reference cavity and the sample cavity; the pressure difference detecting device and the automatic valve are connected in parallel; the control device is respectively connected with the automatic valve and the pressure difference detecting device; an output pipeline of the high-pressure air source device communicates with the reference cavity or the sample cavity; the inlet pressure intensity detecting device is arranged on the output pipeline of the high-pressure air source device; an air exhaust opening is formed in a pipeline of the inlet pressure intensity detecting device and the high-pressure air source device. The high-pressure air source device is connected with the reference cavity or the sample cavity; the change of the pressure intensity inside the reference cavity and the sample cavity can be controlled; the pressure intensity difference is detected through the pressure difference detecting device, so that the control device can accurately obtain a pressure intensity change curve and the particle penetration rate of rock to be measured.

The invention discloses a multiphase seepage medium triaxial stress seepage coupling test device capable of rapidly measuring the porosity. The device comprises a gas seepage system and a triaxial type testing system, wherein the gas seepage system comprises a gas storage cylinder which is provided with a gas storage cylinder control valve; an outlet of the gas storage cylinder control valve is divided into an upstream gas pipeline and a downstream gas pipeline; the upstream gas pipeline is provided with an upstream gas pressure gauge and an upstream gas inlet valve; the downstream gas pipeline is provided with an exhaust valve; the upstream gas pipeline is communicated with the downstream gas pipeline in a converging way; the triaxial type testing system comprises a triaxial pressure chamber; the triaxial pressure chamber is connected on the upstream gas pipeline between the exhaust valve and the upstream gas inlet valve in parallel by a pipeline, and is respectively communicated the upstream gas pipeline and the downstream gas pipeline. After the multiphase seepage medium triaxial stress seepage coupling test device is used, the porosities of rocks with different lithological characters can be rapidly measured, and the rock permeability can be measured by a steady-state method and a pulse method by applying multiple seepage mediums such as water, gas and the like; the test device is high in accuracy and has the permeability measurement accuracy reaching up to 10-24m<2>.

The invention belongs to the field of petroleum engineering, and concretely relates to an experiment apparatus for measuring the permeability of a low permeation rock core, and a method thereof. The apparatus for measuring the permeability of the low permeation rock core comprises an inlet end pressure cap, an outlet end pressure cap, a curing glue sleeve, a carbon oxide gas bottle, a glass funnel, a first scale, a vacuum pump, a polyfluortetraethylene pipe and a second scale, and three ports of a first tee joint are respectively connected with the outlet of the inlet end pressure cap, the carbon dioxide gas bottle and the glass funnel through pipelines and valves; the glass funnel is vertically arranged, and one side of the glass funnel is vertically provided with the first scale; and three ports of a second tee joint are respectively connected with the outlet of the outlet end pressure cap, the vacuum pump and the polyfluortetraethylene pipe through pipelines and valves, the polyfluortetraethylene pipe is horizontally fixed, the polyfluortetraethylene pipe, a tested rock core and the axis of the first tee joint are in a same horizontal line, and one side of the polyfluortetraethylene pipe is provided with the second scale in a parallel manner. The experiment apparatus for measuring the permeability of the low permeation rock core has the advantages of small dead volume and high metering precision.

The invention provides a permeability measurement system and method for low-permeability rock ore particles. The permeability measurement system comprises a high-pressure air source device, a reference cavity, a suction and exhaust valve and two symmetrically-arranged sample side devices; each sample side device comprises a sample cavity, an isolation valve and a balance valve, the sample cavity is communicated with the reference cavity through a circulation pipeline to receive high pressure air transmitted from the reference cavity; the isolation valve is arranged at the position of the circulation pipeline and close to the sample cavity; the balance valve is arranged at the position of the circulation pipeline and close to the reference cavity; the two sample cavities are respectively used for accommodating to-be-detected low-permeability rock ore particles and impermeable solids, the impermeable solids and the to-be-detected low-permeability rock ore particles are identical in particle size and volume, and the sample side devices are arranged at the same height. The permeability measurement system is simple and easy to maintain, small in dimension and high in safety; the permeability measurement system and method has the advantages that credibility and measurement precision of permeability of low-permeability rock ores are remarkably increased.

The invention discloses a calibration method of a core-based gas permeability measuring device. The calibration method comprises the following steps of clearing away air in a pipeline by adopting nitrogen; collecting cross section areas and lengths of to-be-measured cores and clamping the to-be-measured cores in a core holder; controlling the inlet pressure of the core holder by adjusting a gas permeability tester, and collecting pressure values and the core outlet flow rate; fitting out the functional relationship by quadratic difference of the core outlet flow rate and the steady inlet and outlet pressure. According to the functional relationship and the Darcy law, the corresponding inlet pressure and the gas-measured permeability are calculated at the utmost pressure, the relation function of the gas-measured permeability and the reciprocal value of the average pressure is created, and the nodal increment of the horizontal segment of the section function is regarded as Kerr permeability. The absolute core permeability can be quickly and accurately obtained by the gas-measured permeability calibration method-a theoretical limit method.