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61 results about "Saturation index" patented technology
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Method for calculating oil saturation of reservoir
ActiveCN102434152ASolve the difficulty of low accuracy in quantitative evaluation of saturationIn line with the actual lawBorehole/well accessoriesElectrical resistance and conductanceNMR - Nuclear magnetic resonance
The invention discloses a method for calculating oil saturation of a reservoir. The method comprises the following steps of: establishing a reservoir oil saturation model including a free fluid porosity phi f, a bound fluid porosity phi b, as well as corresponding macropore bond index mf, micropore bond index mb and micropore bond index characteristic value parameters; measuring a core porosity phi of a selected core sample; carrying out a nuclear magnetic resonance T2 spectrum experiment and an electric petrophysical experiment on the selected core sample to determine the core porosity phi and bound water saturation Swir of the selected core sample, the free fluid porosity phi f and bound fluid porosity phi b, stratum water resistivity Rw of a saturated rock sample, saturated water rock resistivity Ro of each rock sample, and resistivity Rt of each rock under different conditions of water saturation Sw; determining parameters of a reservoir oil saturation model by adopting an optimization data fitting method; establishing a relationship between the core micropore bond index mb and the bound water saturation Swir; classifying reservoir cores according to the bound water saturation; and determining a saturation index n of each type of cores by using the optimization fitting algorithm.
Owner:PETROCHINA CO LTD
Method for determining stratum water saturation
InactiveCN101649738AThe calculation result is accurateCalculations are reliableBorehole/well accessoriesRock coreWell logging
The invention relates to petroleum well-logging technology, in particular to a method for determining stratum water saturation. The method comprises the following steps: selecting a serial core of geologic feature; obtaining porosity Phi of the core and saturated core stratum water specific resistance Rw; and solving and substituting cementation index m(Rw, Phi) and saturation index n(Rw, Phi) ina common Archie water saturation computation model to calculate accurate stratum water saturation Sw. The method realizes corresponding change along with different physical properties of reservoir stratums and changes in stratum water specific resistance to ensure more accurate and reliable results, thereby having better application effect.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method and device for determining water saturation of stratum
ActiveCN103422853AGood correlationGood application effectBorehole/well accessoriesPetroleumFunctional relation
The invention discloses a method and a device for determining the water saturation of a stratum, and belongs to the field of oil well logging technologies. The method includes selecting series representative cores of a measured region, and measuring values of porosities POR of the series cores and values of specific resistance R<w> of saturated stratum water of the cores; creating a functional relation m(POR, R<w>) among bond indexes m of the cores, the porosities POR of the cores and the specific resistance R<w> of the stratum water; creating a functional relation n(R<w>, POR) among saturation indexes n, the porosities POR of the cores and the specific resistance R<w> of the stratum water; solving the water saturation S<w> of the stratum by the aid of an Archie water saturation interpretation model. The device comprises a selecting module, a parameter measuring module, a bond index creating module, a saturation index creating module and a saturation computing module. The method and the device have the advantages that the functional relations among values of the bond indexes m, values of the saturation indexes n, the porosities POR and the specific resistance R<w> of the stratum water are created, so that the values of the bond indexes m, the values of the saturation indexes n, the porosities POR and the specific resistance R<w> of the stratum water are relevant to one another, and the computed water saturation of the stratum is accurate and reliable.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Heterogeneous vehicle team fault-tolerant control method based on actuator faults and saturation
ActiveCN110244747AGuaranteed stabilityGuaranteed uptimeAdaptive controlPosition/course control in two dimensionsProportional integral differentialTraffic capacity
The invention provides a heterogeneous vehicle team fault-tolerant control method based on actuator fault and saturation. The method comprises the following steps: carrying out stress analysis on longitudinal movement of vehicles, and by combining actuator fault and saturation models, building a vehicle longitudinal dynamics model under the actuator fault and saturation; according to information of the vehicles, constructing a variable time interval strategy with fault information and a saturation index; and based on the constructed variable time interval strategy, establishing a proportional integral differential sliding mode surface and a coupling sliding mode surface; and selecting a proper Lyapunov function, designing a fault-tolerant controller and an adaptive updating rate, and proving the limited time stability of a system. Compared with a traditional variable time interval strategy, the variable time interval strategy with the fault information and the saturation index not only can solve the problem of non-zero initial interval error but also can expand critical traffic capacity.
Owner:DALIAN MARITIME UNIVERSITY
Method for obtaining saturability index of low porosity and low permeability reservoir
ActiveCN104278989AMaterial analysis by electric/magnetic meansMaterial analysis by using resonanceNMR - Nuclear magnetic resonanceRock core
The invention discloses a method for obtaining the saturability index of a low porosity and low permeability reservoir and belongs to the field of reservoir assessment. According to the method, the rock core nuclear magnetic resonance T2 spectrum, T2 geometric mean value, T2 cutoff value, rock core water saturation and rock core resistivity index are obtained through the nuclear magnetic resonance experiment and rock core resistivity experiment conducted on a rock core sample, and the computation model of the saturation index n of the low porosity and low permeability reservoir is established. By means of the establishment of the computation formula of the saturation index n of the low porosity and low permeability reservoir, the variable saturability index n, changing along with the pore structure, of the low porosity and low permeability reservoir can be obtained continuously and accurately.
Owner:PETROCHINA CO LTD
Method for correcting electrical experiment parameter m and n of undersaturated core
InactiveCN101358943AGood correction effectAchieve correctionMaterial resistanceSpecial data processing applicationsPorosityElectricity
The present invention relates to a correction method of experiment parameters m and n of rock electricity of the unsaturated low-porosity low-permeability rock core. When the rock core is unsaturated, the experiment and the calculation are completed according to the standard process of the Rock Resistivity Laboratory Parameters Measurement and Calculation Method(SY / T 5385-1991), to acquire the values of the saturation index n' and the cementation index m' of the unsaturated rock core; the correction formula (1) is adopted to calculate the value of the saturation index n of the saturated rock core; the correction formula (2) is adopted to calculate the value of the cementation index m of the saturated rock core; n is equal to n' plus (lg(R0 / R0')) / lg(Mu)(1); m is equal to m' minus (lg(R0 / R0')) / lg(Phi)(2); the values of the corrected cementation index m and the corrected saturation index n are closer to the real values of the cementation index m and the saturation index n of the rock core; and the correction effects are more obvious.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Traffic control subsection optimization and self-adaptive adjusting method
ActiveCN105225503AImprove division efficiencyEasy constructionControlling traffic signalsRoad networksEngineering
The invention discloses a traffic control subsection optimization and self-adaptive adjusting method. Traffic control subsection division is carried out based on static road levels and dynamic real-time traffic flows, traffic control subsections requiring signal lamp linkage management and control and manual intervention are determined according to a saturation index, and the traffic control subsections are automatically updated. According to the invention, static and dynamic division is carried out on the traffic control subsections based on the road levels and the real-time traffic flows, so that the subsection division efficiency is effectively improved; the different types of traffic control subsections are determined according to the saturation, so that reasonable signal lamp linkage management and control schemes and manual intervention schemes are facilitated; in addition, according to the changes of the real-time traffic flows, the plurality of changed traffic control subsections are re-divided, so that redundant calculation generated by re-division of a whole road network is avoided.
Owner:SUN YAT SEN UNIV
Glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance
ActiveCN104453874AAccurate oil saturationBorehole/well accessoriesLithologySolid-state nuclear magnetic resonance
The invention discloses a glutenite reservoir oil saturation calculation method based on nuclear magnetic resonance. The method includes the steps that glutenite cores of different lithological characters and pore structures are selected, and the porosity phi, the cementation index m, the saturation index n and the nuclear magnetic T2 spectrum of the glutenite cores are measured; the nuclear magnetic T2 spectrum is extracted to reflect the character parameters of the pore structures; through correlation among the cementation index m, the saturation index n and the character parameters of the pore structures, a saturation interpretation model based on the nuclear magnetic T2 spectrum is built; the cementation index m and the saturation index n of a reservoir are calculated through the nuclear magnetic T2 spectrum; the cementation index m and the saturation index n are substituted into the saturation interpretation model to obtain the oil saturation So through calculation. By means of the glutenite reservoir oil saturation calculation method, the quantitative, continuous and highly accurate cementation index m and the saturation index n can be obtained through nuclear magnetic resonance logging data under the condition that no laboratory rock electrical data exist, and the calculated oil saturation is made to be more accurate.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method for determining hydrocarbon saturation of gas logging
The invention relates to a method for determining the hydrocarbon saturation of gas logging. The method comprises the following steps of: acquiring and recording values of non-hydrocarbon components such as gas logging total hydrocarbon and methane through logging devices such as a gas logging apparatus and a comprehensive logging instrument; reading the maximum abnormity value Ct of the total hydrocarbon or methane in an oil-gas abnormity display interval; preferably selecting a gas logging background value Cb of an oil-gas display layer; selecting the hydrocarbon saturation index n of regional gas logging; and working out the hydrocarbon saturation Sh of a specific oil-gas display interval, and outputting a computed result. The method is low in cost, is easy, convenient and accurate, and has a wide application range. According to the method, the hydrocarbon saturations of gas logging oil-gas display layers in 3,700 intervals of more than 610 wells are explained and computed in the Jianghan Basin, the Western Hubei-Eastern Chongqing Area, the Tsaidam Basin, the Ordos Basin and the Tarim Basin, errors do not surpass 15 percent generally in comparison to the logging measurement computed result, the hydrocarbon saturation accuracy is increased by over one time in comparison to the hydrocarbon saturation accuracy determined with a thermal vacuum distillation all-dehydration technology, and the rapid explanation requirements of logging oil-gas display fields can be well met.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for determining rock electricity parameters of digitalized core
The invention relates to a method for determining rock electricity parameter m and n values of a digitalized core, which comprises the following steps of: performing quick nuclear magnetic measurement and calculation on the selected core to obtain nuclear magnetic T2 spectrum and porosity core digitalized data volume; calculating a cementation index m and a saturation index n through a formula respectively; and substituting a logging calculation stratum porosity of an un-cored well field into the established function relations of the cementation index and the saturation index respectively to obtain a cementation index m value and a saturation index n value of the un-cored well field. The method can quickly solve the m and n values, can reach the experimental test effects of the laboratorial conventional standard flow experiments and calculation and acquisition, solves the problem that the rock electricity parameter m and n values cannot be acquired in short time in a laboratory, is convenient and quick to solve, can timely serve or meet the requirements of actual production, and has good application effect.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method for evaluating relative oxygen saturation in body tissues
InactiveUS7949387B2Preparing sample for investigationDiagnostic recording/measuringDiseaseIntraocular pressure
Owner:BOARD OF SUPERVISORS OF LOUISIANA STATE UNIV & AGRI & MECHANICAL COLLEGE
Method for mineralizing seawater desalted water
InactiveCN102897945AHigh hardnessIncrease alkalinitySeawater treatmentMultistage water/sewage treatmentFiltrationWater quality
The invention relates to a method for mineralizing seawater desalted water, which comprises the following steps: keeping constant temperature on the seawater desalted water, adding limestone, introducing CO2 and stirring, performing pumping filtration on a reaction solution after completing the reaction to obtain a clarification liquid, and adjusting the pH value to 7.5-8.5 to obtain the mineralized seawater desalted water. The mineralization method is used for mineralizing the seawater desalted water, a method is employed for dissolving the limestone ore, the hardness of the seawater desalted water is increased; carbon dioxide is used for promoting the dissolution of the limestone, the hardness of the seawater desalted water is increased; thereby the prepared seawater desalted water increases the total alkalinity, the total hardness and pH value of the water body. LSI saturation index can be finally enhanced, and the purpose for reducing Larson coefficient is reduced. the hardness of the seawater desalted water is high, and the seawater desalted water contains mineral matters Ca<2+> and Mg<2+> required by human body, the stability of the water quality is good, and the water quality can satisfy the requirements of biochemical criterion, erosion performance and corrosivity of the drinking water.
Owner:TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Multi-parameter high-temperature high-pressure major diameter rock core holder
InactiveCN104914229AReduce phase requirementsAchieve sealingEarth material testingEngineeringHigh pressure
The invention provides a major diameter rock core holder for realizing multi-parameter measurement under high-temperature and high-pressure conditions. The rock core holder comprises an annular space, a rock core chamber, measuring electrodes, a heating and pressurizing device, an external connection measuring device, a temperature controller and a high-pressure constant speed pump, wherein the annular space is formed by a cylinder body, a glue cylinder, an upper plug and a lower plug. The holder has the characteristics of good high-pressure and high-temperature resistance, no pollution, simple design, convenient operation, simultaneous measurement of multiple parameters, and stable and accurate test result, and can realize measurement of the permeability, the sound wave and the stratum factor at a highest temperature of 150DEG C under a maximum pressure of 70Mpa, and experiment analysis measurement of the saturation index, the multiphase flow displacement and other rock physical parameters through a gas driving method or a semi-permeable separator plate method.
Owner:CHINA PETROCHEMICAL CORP +1
Method and system of obtaining oil saturation based on artificial neural network
ActiveCN103485770AImprove calculation accuracyRapid responseBorehole/well accessoriesLithologyElectricity
The invention relates to the field of oil saturation technologies, and discloses a method and a system of obtaining oil saturation based on an artificial neural network. The method comprises the following steps of carrying out a rock electricity experiment on a core so as to obtain log data; assigning a and b to 1, and carrying out back calculation to obtain m and n; taking a logging curve which represents lithology, physical properties and oiliness as an input layer, selecting the m and the n as output layers, and establishing a BP neural network model; substituting logging data corresponding to the m and the n which are obtained through the rock electricity experiment into the model so as to obtain m' and n'; comparing the m and the n which are obtained through the rock electricity experiment with the m' and the n' which are obtained through the model so as to obtain a model with a minimum error; substituting data on the logging curve of the corresponding input layer into the model with the minimum error so as to obtain a cementation index curve and a saturation index curve; substituting the curves into an Archie's formula so as to compute the oil saturation. According to the invention, computational accuracy of the oil saturation, which is obtained through the Archie's formula, is improved.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Method of determining reservoir water saturation
PendingCN109753755AAvoiding the Dilemma of Water Resistivity DeterminationSpecial data processing applicationsBorehole/well accessoriesElectrical resistance and conductanceRock core
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Automatic gain control device having variable gain control interval and method thereof
Owner:ELECTRONICS & TELECOMM RES INST
Method and Apparatus for Treating Accompanied Water from A Well
ActiveUS20150034556A1Inhibit and prevent depositionEfficient preparationWaste water treatment from quariesUltrafiltrationMagnesium saltFiltration
A method and apparatus for removing soluble silica efficiently from accompanied water, produced from wells containing calcium ion, soluble silica, and sulfate ion, and not clogging a reverse osmosis membrane in the reverse osmosis membrane treatment process after that, includes adding a magnesium salt to mix with the accompanied water under alkaline conditions to produce insoluble silica and calcium sulfate. A microfiltration (MF) membrane treatment process includes treating a first reaction solution obtained in said magnesium salt adding process, with a microfiltration membrane to separate insolubilized silica and calcium sulfate by filtration. An acid adding process includes adding an acid to and mixing with filtrate obtained in the MF membrane treatment process to render a pH value of the filtrate on the range from 5 to 9 and a negative Langeliar saturation index. A reverse osmosis membrane treatment process includes treating a second reaction solution, obtained in the acid adding process, with a reverse osmosis membrane to obtain fresh water and membrane concentrates.
Owner:JFEENG CORP
Urban road intersection postinstallation evaluation index system based on floating car data
InactiveCN108806258AIndicator calculation is simpleAdvanced operation evaluation index systemControlling traffic signalsDetection of traffic movementTraffic signalData acquisition
The invention discloses an urban road intersection signal control optimization method. The method comprises the steps: calculating a delay index, an unbalance index, a saturation index and an overflowindex through floating car data collection and map road network information extraction; quickly and accurately judging current operation states of urban road intersections through a postinstallationevaluation index system containing the indexes. Thus, support is provided for implementing accurate traffic signal control measures, and the purposes of improving urban intersection traffic efficiencyand relieving traffic jam are achieved.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
Determining formation wettability from dielectric measurements
ActiveUS9291050B2Reduce needQuantifying formation wettability quickly and efficientlyElectric/magnetic detection for well-loggingFluid removalThermodynamicsDielectric dispersion
Owner:SCHLUMBERGER TECH CORP
Rail transfer station passenger flow jam risk assessment method based on AFC (automatic fare collection) card swiping data
ActiveCN106779429ALower acquisition costsImprove data qualityResourcesDatabase analysisData dredging
The invention discloses a rail transfer station passenger flow jam risk assessment method based on AFC (automatic fare collection) card swiping data. The method includes the steps: preprocessing AFC original transaction data; assessing rail transfer station passenger flow jam based on the AFC card swiping data; extracting, removing and screening AFC original card swiping data and recognizing transfer passenger flow based on database analysis and data mining technology; acquiring arrival, departure and transfer passenger flow of a transfer station at different time intervals based on the AFC card swiping data, and manually measuring physical parameters at typical positions in the transfer stations on site; building passenger flow saturation assessment indexes at the typical positions to comprehensively assess passenger flow demand and supply relations at the positions; calibrating model parameters according to index maximum values serving as input values of a model in assessment time intervals; calculating the weight of saturation indexes of different typical positions in the model according to an entropy weight method, clustering risk assessment and dividing rail transfer station passenger flow jam five-level risk grades.
Owner:北京格物博图科技有限公司
Determination method and device for saturation index of rock soil
ActiveCN110618170AAccurately determineSolve the difficulty of determining the oil saturation of the reservoirAnalysis using nuclear magnetic resonanceMaterial resistanceElectrical resistance and conductanceSoil science
The invention discloses a determination method and device for a saturation index of rock soil. The method comprises the steps of performing oil washing on target rock soil; performing saturation processing on the target rock soil with a mineral solution after oil washing; drying the target rock soil after saturation processing under a constant-temperature and constant-humid environment, and determining a change relation between resistance increase rate of the target rock soil and water saturation of the target rock soil according to data measured during the drying process after the target drying process is completed; and determining the saturation index of the target rock soil according to the change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil. By the method, the problem that the water saturation index of the rock soil cannot be accurately acquired in the prior art so that the oil saturation of reservoir is difficult to determine is solved.
Owner:PETROCHINA CO LTD
Reverse osmosis membrane scale inhibitor
ActiveCN102336477AStable in natureLong storage periodScale removal and water softeningReverse osmosisColloid
Provided is a reverse osmosis membrane scale inhibitor which comprises polylactic acid having a molecular weight of 1000 to 5000, organic phosphonic acid scale inhibitors and water. The components of the reverse osmosis membrane scale inhibitor are 5 to 15 wt% of polylactic acid and 5 to 80 wt% of organic phosphonic acid scale inhibitors, with the balance being water. The scale inhibitor is a transparent aqueous solution with a pH smaller than 6.0 and a solid content of 20 to 60%. Application concentration of the scale inhibitor is 1 to 100 mg / L; the scale inhibitor can simultaneously preventthe formation of positive colloid sediments like CaCO3, CaSO4, Ca3(PO4)2, BaSO4, SrSO4 and metal oxides, and is applicable under the occasion that a saturation index (LIS) is less than 6.0.
Owner:CHINA PETROLEUM & CHEM CORP +1
Burst light receiving circuit
InactiveCN104579497AGuaranteed burst receive bandwidthImprove saturation indicatorsElectromagnetic receiversFrequency spectrumHigh rate
The invention provides a burst light receiving circuit. The burst light receiving circuit comprises a photodiode biasing circuit, a photodiode, a first-rate TIA (trans-impedance amplifier), a second-rate LA (line amplifier) and a low-pass filter circuit, wherein the first rate is higher than the second rate; the low-pass filter circuit is located between an output end of the first-rate TIA and an input end of the second-rate LA; the first rate is 2.5 G, and the second rate is 1.25 G to be matched with the first rate, so that a 1.25 G burst light receiving circuit with the low frequency spectrum loss is formed; the first rate can also be 4 G, and the second rate is 2.5 G to be matched with the first rate, so that a 2.5 G burst light receiving circuit with the low frequency spectrum loss is formed. The rate of the TIA is higher than that of the LA, and the output end of the high-rate TIA is connected with the low-pass filter circuit, so that the burst receiving bandwidth of an OLT (optical line terminal) optical transceiver module is guaranteed, and the saturation index of a burst light receiving module is improved finally.
Owner:APAT OPTOELECTRONICS COMPONENTS
Method for determining heterogeneous carbonate reservoir saturation index
ActiveCN106093350ARealize dynamic calculationImprove calculation accuracyElectric/magnetic detection for well-loggingEarth material testingReservoir typeSaturation index
The invention discloses a method for determining a heterogeneous carbonate reservoir saturation index. The method comprises the steps that a target rock reservoir is divided into at least two reservoir types according to a preset rule, a corresponding relation between the saturation index and irreducible water saturation of each reservoir type is acquired, the reservoir type of a core to be detected is determined according to the preset rule, the irreducible water saturation of the core to be detected is acquired, and the saturation index of the core to be detected is calculated based on the corresponding relation of the reservoir type according to the irreducible water saturation of the core to be detected.
Owner:PETROCHINA CO LTD
High-efficiency fluorine-free desulfurization refining slag system for low-carbon aluminum-killed steel
The invention discloses a fluorine-free high-efficiency desulfurization refining slag system for low-carbon aluminum-killed steel. The basic slag of the refining slag system is CaO-SiO2-Al2O3, and the weight percentages of each component in the basic slag are respectively: 57.4-61.8% CaO, 5-10% SiO2, 29.5-36% Al2O3; and, the basicity R of the refining slag system is 5.8-11.5, the Mannesmann index MI is 0.2-0.4, and the C / A is 1.6- 2.1, the saturation index of CaO is 0.9-1.0, the slag factor is ≤0.5, and the melting point is ≤1550°C. While reducing slag amount and production cost, the present invention can stably control the sulfur content in molten steel at the end point of LF refining below 20ppm, the desulfurization rate can reach over 80%, and effectively reduce production cost.
Owner:INST OF RES OF IRON & STEEL JIANGSU PROVINCE
Saturation index prediction method based on pore structure
ActiveCN105401937AAccurately determineDetermining Oil SaturationBorehole/well accessoriesNMR - Nuclear magnetic resonanceRock core
The invention discloses a saturation index prediction method based on a pore structure. The saturation index prediction method includes the steps that firstly, a representativeness core sample of a target layer is selected, a salt solution with a certain concentration is used for saturation, and the nuclear magnetic resonance spectrums T2 of a saturated rock core are measured; secondly, a centrifugal machine is used for centrifuging the saturated rock core under different rotating speeds, and the nuclear magnetic resonance spectrums T2 of the rock core in different centrifugal states are measured; thirdly, the geometric mean value T2 of the nuclear magnetic resonance spectrums T2 of the saturated rock core, the geometric mean value T2 of the nuclear magnetic resonance spectrums T2 of the rock core in different centrifugal states and the water saturation of the rock core are calculated; fourthly, the distribution change rate of the spectrums T2 is constructed, the pore structure index n' of the rock core is obtained according to the change relation curve of the distribution change rate of the spectrums T2 and the water saturation; and fifthly, the saturation index of the rock core is predicted according to the pore structure index n' of the rock core, and the saturation index of the target layer is determined.
Owner:PETROCHINA CO LTD
Cleaning method of water-circulating system for coal-winning machine
ActiveCN1981945AEasy descaling methodQuick and easy descaling methodHollow article cleaningCleaning using liquidsCleaning methodsCirculating pump
A method for removing water scale from the water circulating system of coal mining machine includes such steps as connecting an external water circulating with the internal one of coal mining machine, turning off the circulating pump, washing for removing water scale, collecting part of clean water, calculating its saturation index LSI, adding cleaning media, washing in circulation mode, neutralizing, draining, filling clean water, circulating while washing, and draining.
Owner:CHINA SHENHUA ENERGY CO LTD
Laboratory measurement method for electrical properties of shale in longmaxi formation in Pingqiao region
InactiveCN113219007AThe resistivity parameter effectively yieldsMaterial resistanceElectrical resistance and conductanceRock core
The invention relates to a laboratory measurement method for electrical properties of shale in a longmaxi formation in a Pingqiao region. The laboratory measurement method comprises the following steps: step 1), vacuumizing a solution chamber and a rock core chamber; 2) measuring the core resistivity of the rock sample by a self-absorption saturation method; (3) measuring the core resistivity of the rock sample by using a pressurization saturation method; and recording the resistivity under the saturation condition of each rock sample, and calculating resistivity parameters. Compared with a traditional mode, on the basis that the shale core is not damaged, the resistance of the rock under various saturation conditions in the rising saturation process is measured till the rock sample reaches the ultimate saturation state. The volume and the resistance of the sucked solution are recorded, and finally rock resistivity parameters, namely a formation factor a, a pore cementation index m and a saturation index n are obtained, and shale resistivity parameters are effectively obtained.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for measuring water saturation of tight sandstone reservoir
InactiveCN111894567AThe calculation result is accurateIn line with the actual ground conditionsBorehole/well accessoriesRock coreWell logging
The invention discloses a method for measuring the water saturation of a tight sandstone reservoir. The method comprises the following steps of acquiring a plurality of types of logging curves of eachreservoir through known rock electricity experiments of rock cores of a plurality of reservoirs; calculating the correlation dimension of the logging curve of each category of each reservoir; solvinga first fractal dimension and a second fractal dimension of each reservoir, establishing a first linear relational expression between the first fractal dimension of each reservoir and the cementationindex of the reservoir by adopting a linear fitting method, and establishing a second linear relational expression between the second fractal dimension of each reservoir and the saturation index of the reservoir; establishing a linear relation between the cementation index of each reservoir and loga, and dividing the to-be-logged into a plurality of reservoirs; calculating the cementation index and the saturation index of each reservoir to be logged; and calculating the water saturation of each reservoir to be logged. According to the measuring method, the water saturation of the tight sandstone reservoir can be accurately measured.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
Method and device for determining water saturation of horizontal well reservoir
PendingCN111485874AImprove calculation accuracyDesign optimisation/simulationBorehole/well accessoriesLithologySoil science
The invention discloses a method and device for determining water saturation of a horizontal well reservoir. The method comprises the steps of determining the vertical resistivity and the horizontal resistivity of the reservoir according to resistivity data of the reservoir; determining an anisotropy coefficient of the reservoir according to the vertical resistivity and the horizontal resistivity;and calculating the water saturation of the reservoir according to rock physical parameters of the reservoir in the horizontal direction and the vertical direction and the anisotropy coefficient; wherein the rock physical parameters include a lithology coefficient, a lithology index, a cementation index and a saturation index. The method and device for determining the water saturation of the horizontal well reservoir solve the technical problem in the prior art that the water saturation of horizontal well logging cannot be accurately calculated.
Owner:PETROCHINA CO LTD
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