134 results about "Bound water" patented technology

The invention belongs to the technical field of evaluation, development and research of oil and gas reservoirs, and discloses a T2 cutoff value calculation method based on a saturated nuclear magnetic resonance experiment. The method comprises the following steps: acquiring a saturated / bound water nuclear magnetic resonance T2 spectrum curve of a compact sandstone sample; determining a T2 cut-off value based on a saturated / bound water nuclear magnetic resonance accumulative porosity curve, and recording the T2 cut-off value as T2-Cuff; acquiring a logT2-logphi intersection curve of the saturated nuclear magnetic resonance T2 spectrum, and recording a T2 value corresponding to an inflection point of the curve as T2-Log; and determining a mathematical relationship between the T2-Log and the T2-Cuff, and establishing a T2 cut-off value calculation model based on the saturated nuclear magnetic resonance experiment. According to the method, the T2 cutoff value can be calculated only by performing the nuclear magnetic resonance experiment on the saturated water sample and performing mathematical treatment on the T2 spectrum, and the method has the advantages of being economical, simple, efficient and high in practicability.

The invention discloses a nuclear magnetic T2 spectrum correction method for a shale reservoir, and relates to the field of object detection, and the nuclear magnetic T2 spectrum correction method for the shale reservoir comprises the following steps: 1, determining the gas logging porosity, saturated water porosity and main mineral components of the shale reservoir; compared with the prior art, the method disclosed by the invention has the beneficial effects that a drying-saturated water-centrifugal two-dimensional nuclear magnetic resonance experiment is carried out, and signals of crystal water, clay bound water and hydroxyl in a sample are preliminarily identified; through inversion of organic matter signals in the dry sample, signals of movable water are further determined; the relation between the difference value among the gas logging porosity, the saturated water porosity and the nuclear magnetic porosity and different mineral contents is discussed, and particularly the remarkable influence of iron-containing minerals on the porosity difference value is discussed; by eliminating the influence of diffusion relaxation caused by the magnetic susceptibility difference, the T2 spectrum correction method based on the mineral magnetic susceptibility is established, and the T2 spectrum accuracy obtained through nuclear magnetic resonance measurement is improved.

The invention belongs to the field of hydrogel preparation, and particularly relates to a preparation method of SA / CS / Ca < 2 + > dual-network hydrogel, an obtained product and application. The sodium alginate / chitosan / calcium ion (SA / CS / Ca < 2 + >) physical cross-linked double-network hydrogel is prepared through a semi-dissolution acidification sol-gel conversion method and an internal gel method, the hardness and chewiness of the hydrogel can be remarkably improved, and the elasticity and cohesiveness of the hydrogel can be improved; freeze-thaw stability research is carried out on the prepared SA / CS / Ca < 2 + > dual-network hydrogel, the influence of freezing temperature, thawing temperature, freezing and thawing cycle times and other conditions on properties such as gel structure, rheology, swelling rate, moisture distribution and the like is explored, and the result shows that when the freezing temperature is-80 DEG C and the thawing temperature is 4 DEG C, the gel subjected to one-time freezing and thawing cycle has good stability. Through detection and analysis, the hardness is relatively high, the elasticity and cohesiveness are also remarkably improved, the elastic modulus (G ') and the viscous modulus (G' ') of the gel are best, the swelling rate is relatively low, the free water content is relatively low, the bound water content is relatively high, and the gel structure is relatively stable.

The invention relates to an automatic magnesium oxide coating analysis system and method, and belongs to the technical field of coating quality analysis. The method comprises the following steps: acquiring attributes of a magnesium oxide coating, an infrared spectrum and environment temperature and humidity data, and constructing a multi-source feature set; analyzing the distribution dispersion and local enrichment risk of free water based on a dynamic migration model, and analyzing the bonding weakening degree and dissociation risk of bound water based on a chemical stable state model; respectively generating free water treatment process parameters for inhibiting structural damage and combined water treatment process parameters for preventing performance degradation according to the abnormal analysis result and the coating attribute; by performing coupling influence analysis on the two types of process parameters, the balance requirements of the structural integrity and chemical stability of the coating are coordinated, an optimized process scheme is generated, and cooperative regulation is realized. According to the method, accurate identification, independent analysis and cooperative control of the free water and the bound water are realized, and the accuracy, reliability and quality consistency of coating water treatment are improved.

The invention discloses a novel dust falling material with strong wettability and high strength and toughness and a preparation method thereof. The novel dust falling material is prepared from the following raw materials in parts by weight: 1-3 parts of pectin, 10-35 parts of acrylamide, 1-2.5 parts of an initiator, 0.06-0.1 part of sodium periodate, 20-60 parts of bentonite, 8-12 parts of a wetting agent and 1000-3000 parts of water. According to the dust suppressant, the remarkable advantages of performance breakthrough, environment friendliness and economic optimization are achieved through the synergistic effect of multiple components, it is measured through experiments that the dust suppressant can form a solidified shell layer with toughness and strength on the surface of a coal sample, and the dust suppressant has the unique double-water-locking mechanism that polymer carboxyl chemical bonding water molecules and bound water physically adsorbed between bentonite layers are combined, so that the dust suppressant has the good dust suppressant effect on the surface of the coal sample. A good water loss rate can be maintained in a high-temperature drought environment, and the dust suppression efficiency can be improved due to the rapid film forming characteristic. A solidified layer with a complete structure is formed after drying, pulverized coal is effectively prevented from loosening, the inhibition rates of PM2.5 and PM10 both exceed 95%, and the efficient and lasting dust suppression effect is achieved.

The invention discloses a method and a device for determining water blocking damage degrees of different pore sizes of a rock core. Comprising the following steps: acquiring physical property data of a target rock core and simulated formation water; vacuumizing, pressurizing and saturating the target rock core to obtain a saturated water state rock core, and obtaining a first transverse relaxation spectrum and a first longitudinal and transverse relaxation correlation spectrum through nuclear magnetic resonance; performing displacement treatment on the rock core to obtain a water-bound state rock core, and obtaining a second transverse relaxation spectrum and a second longitudinal and transverse relaxation correlation spectrum; determining a pore size range, and establishing a water blocking damage identification chart to define a characteristic interval between bound water and saturated water; carrying out difference operation to obtain a difference spectrum matrix, extracting pore space areas of bound water and saturated water in the matrix, and calculating an area ratio; and determining the water blocking damage degrees of different pore sizes by combining the porosity, the permeability and the ratio. According to the method, the pore scale can be accurately divided, the damage of each scale can be quantified, the development efficiency can be optimized, and a reliable basis is provided for formulating a reservoir unblocking scheme.

The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer natural water content portable intelligent measuring instrument based on multi-source sensing fusion, which comprises a composite probe assembly and an intelligent measurement and control host which are physically connected, the composite probe assembly is configured to be inserted into a soil layer to be tested to construct a multi-physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe assembly. By constructing a cross physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient step response of a dielectric constant under an acoustic radiation force field; the problems that the coupling influence of the water content and the volume weight cannot be distinguished and the conductivity of bound water and the conductivity of free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric water content, the in-situ dry volume weight, the bound water content and the actual conductivity of pore water are synchronously inverted through a single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.

The invention discloses an ultra-low-resistance hydrocarbon reservoir recognition method, device and equipment based on irreducible water saturation calculation and a medium, and relates to the field of geophysical logging, and the method comprises the steps: carrying out the standardization operation of logging information of a to-be-recognized stratum, so as to obtain target logging information, performing a core experiment on a first target stratum in the to-be-identified stratum to obtain core data, and performing core depth homing based on target logging data to obtain target core data; constructing a first function based on a natural potential corresponding to a first target stratum in the target logging information; determining a first empirical coefficient and a second empirical coefficient according to the first function and irreducible water saturation corresponding to a first target stratum in the target core data, and constructing a second function by using the first empirical coefficient and the second empirical coefficient; and aiming at a second target stratum which is not subjected to a core experiment in the stratum to be identified, identifying the ultra-low resistivity hydrocarbon reservoir in the second target stratum based on the porosity, the deep induced resistivity and the irreducible water saturation determined by the second function.

The invention discloses a laboratory adsorption gas calculation method based on isothermal adsorption-nuclear magnetic resonance combined measurement, and relates to the technical field of exploration geophysics. According to the invention, on the basis of isothermal adsorption-nuclear magnetic resonance combined measurement experiment, 23MHz nuclear magnetic resonance experiment is utilized; nuclear magnetic signal conversion of bound water-adsorbed state methane is carried out through nuclear magnetic resonance T2 spectrums of coal rocks with different water saturations and T2 spectrums measured through a coal rock isothermal adsorption-nuclear magnetic resonance combined measurement experiment to obtain the hydrogen content of the adsorbed state methane, then the amount of substance of the adsorbed state methane is obtained, and finally the volume of the adsorbed state methane is obtained. The method comprises the following steps: firstly, measuring and determining the content of bound water in the coal rock by adopting a 25mm sample tube and the current minimum nuclear magnetism callback interval, then carrying out bound water-adsorbed gas nuclear magnetism signal conversion on the sample tube used in an isothermal adsorption-nuclear magnetism combined measurement experiment to obtain the hydrogen content of the adsorbed gas, further obtaining the amount of substance of the adsorbed gas, and finally obtaining the volume of the adsorbed gas.

The invention discloses an organic matter-rich rock physical modeling method and system considering multiple pore media, and the method comprises the steps: setting initial bulk moduli and shear moduli of different minerals, and obtaining the bulk modulus and shear modulus of a rock skeleton; obtaining a predicted organic carbon content based on a logging curve; the kerogen content is obtained by predicting the organic carbon content; the porosity of communicating holes in a rock skeleton is corrected through the content of kerogen; adding kerogen as a solid filler into the rock skeleton; different pore types are distinguished, and pores are added into the rock skeleton; bound water is added into the rock skeleton; adding a movable fluid into the rock skeleton; determining the bulk modulus and shear modulus of minerals in the rock skeleton; and the longitudinal and transverse wave speed prediction effect is optimized. Organic carbon is converted into kerogen, the kerogen is added into a rock skeleton to correct the content of dry communicating holes and bound water pores, and fluid is added by considering different pore conditions, so that the accuracy and reliability of a model speed prediction result are improved.

The invention belongs to the technical field of cerium-based rare earth oxide dispersibility testing, and particularly relates to a method for evaluating cerium-based rare earth oxide particle surface characteristics and slurry dispersion stability. Comprising the following steps: when cerium-based rare earth oxide particles are synthesized, adding a paramagnetic element as a probe, and mixing the synthesized particles with a dispersing agent and water to obtain mixed slurry; nuclear magnetic resonance scanning is adopted, the body water relaxation peak and the particle surface bound water and body water exchange dynamic relaxation peak of the mixed slurry in each stage of the process from uniform mixing to standing layering are measured, and the particle surface characteristics are evaluated based on the relaxation efficiency; meanwhile, a linear relation between the relaxation peak area proportion and the sedimentation time in the standing layering process is constructed, a fitting slope value is obtained, and the dispersion stability of the mixed slurry is evaluated. According to the method, non-intrusive in-situ detection of the dispersion stability of the cerium-based rare earth oxide particle slurry is realized by innovatively using a low-field nuclear magnetic resonance mode, and accurate comparison and evaluation of the dispersion stability can be realized.

The invention discloses a shale oil reservoir volume fractured horizontal well'stuffiness-drainage-production 'integrated physical simulation method, which comprises the following steps: drilling a shale oil reservoir full-diameter plunger rock sample, and completing rock sample pretreatment; wax-sealing the pretreated rock sample, and vacuumizing and pressurizing to saturate heavy water; displacing the saturated heavy water rock sample with the compounded in-situ crude oil until a bound water state; wax seals are removed, quartz sand is laid on the end faces of the rock samples, the rock samples are spliced to form a volume fracturing horizontal well physical model, and the volume fracturing horizontal well physical model is loaded into a rock sample holder; heavy water is pumped into the inlet end of the rock sample holder and pressurized, the inlet end is closed, and the well closing process after fracturing is simulated; and opening the inlet end of the rock sample holder, and simulating flowback production after fracturing. According to the experimental method, the'stuffy-drainage-mining 'physical process of the shale oil volume fractured horizontal well can be restored, fluid imbibition, flowing and occurrence rules are researched, and efficient development of shale oil reservoirs is guided.

The present application relates to the technical field of hygroscopic materials, and specifically to a composite hygroscopic material and preparation method, a composite hygroscopic agent and preparation method, and applications. The composite hygroscopic material comprises a substrate and an organic substance loaded on the substrate; wherein the organic substance is an organic substance containing amino or sulfonic acid groups; the substrate comprises a molecular sieve; the hygroscopic material is a composite of organic and inorganic materials, which adsorbs water molecules to form bound water, thereby effectively preventing water molecules from condensing into liquid water in the pores, thereby achieving desorption of the hygroscopic material at 70°C, an adsorption depth below 40°C, and an adsorption capacity of more than 300g / kg.

The invention discloses an overpressure stratum rock physical modeling method and system considering multiple pore media. The method comprises the following steps: constructing a rock skeleton; adding bound water pores into the rock skeleton; adding bound water modulus into the rock skeleton containing bound water pores; the proportion of flexible pores and the flexible porosity are calculated firstly, and then the flexible pores are added into the rock skeleton containing the bound water modulus; adding the rigid pores into the rock skeleton containing the flexible pores; adding a movable fluid to the dual-pore rock skeleton; determining bulk moduli and shear moduli of various minerals of the saturated fluid equivalent model; based on the volume modulus and the shear modulus of various minerals of the saturated fluid equivalent model, optimizing and adjusting the irreducible water pore aspect ratio and the rigid pore aspect ratio. According to the method, on the basis of predicting the formation pore pressure, bound water pores and moduli are added into a rock skeleton, and fluid is added by considering different pore conditions, so that the accuracy and reliability of a model speed prediction result are improved.

The invention discloses a method for identifying the occurrence state of water in urban sludge by using extracellular polymeric substances, relates to a method for identifying the occurrence state of water in sludge, and aims to solve the technical problem that the existing method for testing the distribution of water in sludge is poor in accuracy, and the method comprises the following steps of: extracting an extracellular polymeric substance solution of urban sludge, and testing the total organic carbon content in the extracellular polymeric substance solution; or the ratio of the hydrophobic organic matter to the hydrophilic organic matter, or the content of protein, or the content of polysaccharide, or the content of humic acid, or the fluorescence intensity value of tryptophan protein, or the fluorescence intensity value of tyrosine protein, or the proportion of alpha-helix of a protein secondary structure, or the proportion of beta-corner, or the proportion of beta-helix of a protein secondary structure; the content of the free water, the chemical bound water and the mechanical bound water is calculated according to the relation curve between the parameters and the free water and the chemical bound water, the quantification precision is high, the detection precision of the sludge dewatering performance is improved, and support is provided for the sludge dewatering process.

A treatment solution for a food product may include water, salt, and ground substrate of the food product being treated. The water, salt, and ground substrate are emulsified together to define an emulsified treatment solution, and protein of the ground substrate is activated to bind water to the food product when is treated with the treatment solution. The treatment solution remains at a substantially constant viscosity after emulsification.

The embodiment of the invention provides a rock irreducible oil saturation determination method, which comprises the following steps: carrying out nuclear magnetic resonance T1-T2 test on a to-be-tested rock sample without a movable fluid to obtain first test data; determining a first content relative value of bound oil in the to-be-tested rock sample based on the first test data, and determining a second content relative value of bound fluid in the to-be-tested rock sample based on the first test data, the bound fluid comprising bound oil and bound water; performing nuclear magnetic resonance T2 test on the rock sample to be tested to obtain second test data; determining the bound oil porosity of the rock sample to be tested based on the second test data, the first content relative value and the second content relative value; and determining the irreducible oil saturation of the to-be-measured rock sample based on the total porosity of the to-be-measured rock sample and the irreducible oil porosity. According to the technical scheme provided by the embodiment of the invention, the accuracy of determining the rock irreducible oil saturation can be improved.

The application discloses a shale oil reservoir core micro-percolation model and a preparation method and application thereof, and belongs to the technical field of oilfield development experiment researches.The core micro-percolation model comprises a rock sample and adhesive glass sheets used on two surfaces of the rock sample, and according to the oil-water flow direction in the rock sample, the side surface of the rock sample is set as an inflow end, an outflow end, a first end and a second end respectively, one or two needle heads are arranged close to the inflow end, one needle head is arranged close to the outflow end, and the core micro-percolation model is packaged through glue.The single-needle head and double-needle head micro-percolation models are prepared for different types of shale oil reservoir cores, and oil-water two-phase percolation experiments are carried out on typical rock samples; through the experiments, more accurate understanding of the percolation channels of oil and water in the shale reservoir core is obtained, the distribution states of residual oil and bound water in the core are accurately characterized in a visualized mode, and important references can be provided for the research on percolation curves, the understanding of percolation rules and the compilation of development schemes.

The present invention relates to a lacustrine shale conductive model and saturation evaluation method considering the influence of organic matter, belonging to the technical field of oil content evaluation of unconventional oil and gas reservoirs, including: 1) characterizing fluid information in shale samples based on pressure-maintained sealed samples and two-dimensional nuclear magnetic resonance technology; 2) classifying lacustrine shale lithology types according to shale organic carbon content and clay content, and analyzing the relationship between resistivity values ​​of different lithologies and free water and bound water porosity; 3) selecting siltstone interlayer samples, and inversely calculating the cementation index and saturation index of the inorganic pore conductive network; 4) establishing a lacustrine shale parallel conductive model, and calibrating rock electrical parameters by lithology; 5) establishing a lithology and lithology discrimination chart, a TOC prediction model, a bound water content prediction model and an effective porosity calculation model, and combining the lacustrine shale parallel conductive model to interpret oil saturation by different lithologies. The present invention provides accurate shale reservoir fluid information and provides a new idea for rock electrical parameter calibration.

This invention provides a fluid identification method, device, processor, and machine-readable storage medium, relating to the field of oil and gas reservoir evaluation. The method includes: determining the porosity correction coefficient for escaping fluids in multiple full-diameter core sections; determining the apparent total porosity, two-dimensional nuclear magnetic resonance T1-T2 spectra, and porosity of each fluid component in the full-diameter core; determining the porosity of the fluid distribution range, the porosity of the bound fluid distribution range, the porosity of the movable fluid in vacuum-saturated water, and the total porosity; determining the escaping fluid porosity correction coefficient based on the total porosity, apparent total porosity, and bound water porosity of the full-diameter core, and establishing a porosity correction coefficient model based on the correction coefficients of multiple core sections, and determining the total porosity based on the model; and determining the oil and gas saturation and water cut of the entire well section core using the apparent total porosity, total porosity, water saturation, and porosity of each fluid component. Through this invention, the porosity of gas reservoir cores can be accurately measured, fluid properties can be accurately identified, and quantitative evaluation can be performed.

The invention discloses a closed coring saturation correction system, which relates to the technical field of oil and gas reservoir evaluation and comprises a movable water degassing correction model based on a nuclear magnetic simulation experiment and a bound water volatilization correction model based on a volatilization experiment. The method comprises the following steps: determining movable water loss through a nuclear magnetic simulation experiment, and establishing a movable water degassing correction model with permeability, movable water saturation and time; determining irreducible water loss through a volatilization experiment, and establishing an irreducible water volatilization correction model with permeability, irreducible water saturation and time; through combination of the movable water degassing correction model and the irreducible water volatilization correction model, more accurate correction of the closed coring water saturation is realized.

The present application relates to oil and gas geology evaluation technical field, specifically to a kind of construction method of resistivity model for evaluating the adsorbed oil content of shale oil reservoir.The method includes: based on effective medium symmetric conduction theory, establish the shale adsorbed oil resistivity model consisting of rock skeleton, adsorbed oil, free oil, free water and clay bound water five components;According to well logging data, determine the mineral skeleton content, argillaceous content and porosity in the model;Using the whole rock XRD of core sample, porosity determination and rock pyrolysis experimental data, the model geometric parameters are determined by using Powell optimization algorithm;Finally, the adsorbed oil component content is solved according to dichotomy iteration algorithm and converted into adsorbed oil mass.The present application overcomes the problem that traditional step pyrolysis experiment is limited by core sample and is difficult to realize continuous evaluation of whole well section, realizes continuous and quantitative evaluation of the adsorbed oil content of shale oil reservoir, and provides technical support for the evaluation of adsorbed oil content of shale oil reservoir.

A system (100) for determining the hydrogen potential (pH) of flood wastewater and the irreducible water saturation, the system (100) comprising: a Dean-Stark apparatus (102) configured to clean core plug samples using a 50:50 solvent mixture of toluene and methanol at a temperature of 40°C; an ultrasonic cleaner (104) connected to the Dean-Stark device (102) and configured to remove surface deposits from the core samples after cleaning; a humidity-controlled oven (106) connected to the ultrasonic cleaner (104) and configured to dry and heat the core samples for 72 hours; a helium porosimeter (TPI-219) (108) connected to the moisture control furnace (106) and configured to determine the porosity of the core plug samples, including billets of different volumes, for measuring grain volume; an X-ray diffractometer (110) connected to the helium porosimeter (TPI-219) (108) and configured to determine the mineral composition of the sandstone rocks; a core flooding unit (112) comprising a core holder (112a), hydraulic pumps (112b), a back pressure regulator (BPR) (112c) and a heat source (112d) connected to the X-ray diffractometer (110) and designed to maintain certain temperatures of the core plugs during flooding, thereby enabling the injection of brine and oil under controlled conditions; a water analyzer (114) connected to the core flooding unit (112) and configured to measure the pH of the core wastewater; a liquid permeability meter (116) connected to the water analyzer (114) and configured to determine the permeability of the core plugs after initial water saturation; a receiving unit (118) connected to the liquid permeameter (116) and configured to collect wastewater after flooding; and a water bath (120) connected to the receiving unit (118) and configured to maintain a stable temperature during wastewater separation.

The application discloses a method for determining the lower limit of movable fluid in water drive gas reservoirs and a preparation method thereof, and belongs to the technical field of oilfield development. T 2The conversion relationship between the relaxation time and the pore throat radius is derived and established by considering the bound water film thickness, the bound water film thickness, the maximum pore throat radius and the minimum pore throat radius of the rock sample are calculated and obtained; the change characteristics of the nuclear magnetic resonance T 2The residual gas saturation of the rock sample after water drive gas is calculated and obtained by using the fractal theory, the theoretical expression of the lower limit of the movable fluid pore diameter, the lower limit of the movable fluid porosity and the lower limit of the movable fluid permeability considering the bound water film thickness is respectively derived and established; the lower limits of the movable fluid pore diameter, the porosity and the permeability in the water drive gas process are respectively calculated and evaluated by using the Newton iteration algorithm and the numerical integration algorithm in combination with the theoretical expression and the related parameters.

The invention relates to the field of rock and soil testing, and particularly discloses a nuclear magnetic resonance detection method for the pore water state of cohesive soil, which comprises the following steps: optimizing a nuclear magnetic resonance echo parameter acquisition scheme, and adjusting acquisition parameters such as echo interval time (Time Echo) and polarization wait time (Time Wait) and a signal processing strategy; and a low-field nuclear magnetic resonance echo acquisition and partition inversion method for needle bound water, capillary water and gravity water is formed. According to the method, relaxation distribution of bound water, capillary water and gravity water can be effectively separated, the problem of quantitative identification of water in different occurrence states such as gravity water, capillary water and bound water in rock and soil media is solved, the quantitative and qualitative analysis precision is improved, and the method is suitable for the fields of soil, hydrogeology, oil and gas exploration and the like.

This application provides a method, apparatus, and device for obtaining bound water saturation. The method includes: acquiring reservoir parameters of a rock sample to be tested, and calculating the bound water saturation of the rock sample based on the reservoir parameters and a bound water saturation formula. The bound water saturation formula is pre-established based on the bound water saturation of multiple first rock samples and reservoir parameters, through multiple linear regression analysis. The bound water saturation of the multiple first rock samples is calculated based on the cumulative permeability contribution rate corresponding to the category to which the first rock sample belongs under porosity and pore structure index. Different cumulative permeability contribution rates are used to calculate the bound water saturation of different categories of rock samples, thereby ensuring the accuracy of the bound water saturation of the multiple first rock samples and the established bound water saturation formula. Therefore, the accurate bound water saturation of the rock sample to be tested can be obtained based on this formula.

The present invention belongs to the technical field of dynamics of groundwater in an aeration zone. Disclosed is a method for calculating a bound water vapor diffusion coefficient of a glass sand porous medium. In the method, for a bound water vapor diffusion process of a glass sand porous medium, a functional relationship of a bound water vapor diffusion coefficient with regard to a bound water evaporation rate and a bound water evaporation equivalent area is established, and then the bound water vapor diffusion coefficient is calculated. By using the method, dynamic changes in the bound water vapor diffusion coefficient during a water evaporation process of the glass sand porous medium can be calculated. The method for calculating a bound water vapor diffusion coefficient of a glass sand porous medium provided in the present invention can rapidly acquire a bound water vapor diffusion coefficient with high precision and high reliability.

The invention discloses a mud mask as well as a preparation method and application thereof, and relates to the field of cosmetics. According to the present invention, the porous silica is added to the water phase component of the mud film raw material, such that the free water in the mud film formula can be converted into the bound water so as to avoid or significantly reduce the high temperature water outlet problem of the mud film, and the scheme is simple and easy to implement, does not affect the production and the effect of the mud film, and can solve the high temperature water outlet problem of the mud film at a low cost; and a way is provided for high-quality production of the mud film.

The invention discloses a method for predicting the performance of a GO separation membrane based on molecular simulation and a preparation method of the GO separation membrane. Based on a molecular dynamics simulation technology, revealing a relationship among a GO interlayer water distribution state, an interlayer spacing and a chemical environment, and obtaining an interlayer water distribution state beneficial to ion transmission and corresponding geometric and chemical parameters of the membrane; the GO ion separation membrane is prepared under the guidance, a suspension of single-layer GO is prepared, a polyethersulfone membrane is adopted as a substrate, and thermal reduction treatment is performed after vacuum filtration and membrane formation. By reasonably regulating and controlling the interlayer spacing and the chemical environment of the GO membrane, fine regulation and control are carried out on the distribution state of water molecules containing interface bound water and non-interface free water in a confinement channel, and selective transmission of Li < + > relative to Na < + > and Mg < 2 + > by the GO membrane can be realized.

The invention discloses a condensate gas reservoir horizontal well reverse condensation multiphase flow pseudo-pressure determination method. The method comprises the following steps: determining relative permeability of a gas phase and an oil phase under different pressures based on well flow component data of a condensate gas reservoir horizontal well; determining the gas phase relative permeability under irreducible water saturation based on the relative permeability curve of the condensate gas reservoir horizontal well; correcting the gas phase relative permeability under different pressures and the gas phase relative permeability under irreducible water saturation based on a capillary number effect and a high-speed non-Darcy effect generated by the seepage velocity of condensate gas in the condensate gas well; and based on the oil phase relative permeability under the different pressures, the corrected gas phase relative permeability under the different pressures and the corrected gas phase relative permeability under the irreducible water saturation, utilizing a three-region pseudo-pressure equation to determine the pseudo-pressure of the three regions of the condensate gas well. The pseudo-pressure of the condensate gas reservoir can be calculated more accurately, and a necessary basis is provided for subsequent productivity evaluation and reasonable and efficient development of the condensate gas reservoir.