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42 results about "Petrophysics" patented technology
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Petrophysics (from the Greek πέτρα, petra, "rock" and φύσις, physis, "nature") is the study of physical and chemical rock properties and their interactions with fluids. A major application of petrophysics is in studying reservoirs for the hydrocarbon industry. Petrophysicists are employed to help reservoir engineers and geoscientists understand the rock properties of the reservoir, particularly how pores in the subsurface are interconnected, controlling the accumulation and migration of hydrocarbons. Some of the key properties studied in petrophysics are lithology, porosity, water saturation, permeability and density. A key aspect of petrophysics is measuring and evaluating these rock properties by acquiring well log measurements – in which a string of measurement tools are inserted in the borehole, core measurements – in which rock samples are retrieved from subsurface, and seismic measurements. These studies are then combined with geological and geophysical studies and reservoir engineering to give a complete picture of the reservoir.
Petrophysics-Guided Processing of LWD Acoustic Data
Formation evaluation measurements are used to estimate formation lithology. The estimated lithology is used to provide an estimate of acoustic wave slowness. The estimated acoustic wave slowness is used to provide processing parameters for acoustic data that are less sensitive to noise.
Owner:BAKER HUGHES INC
Method for calculating formation pressure based on petrophysical parameters
The invention discloses a method for calculating formation pressure based on petrophysical parameters, and uses well measurement data of a velocity of a P-wave VP, a velocity of a shear wave VS, a density Rho and a porosity Phi of formation. The method comprises the following steps: deriving a ratio value between a bulk modulus Kdry of a dry rock and a bulk modulus Kma of a rock matrix material by using a Gassmann equation; calculating an effective bulk modulus Kma of a mineral component according to a V-G-H model, calculating a bulk modulus Kf of a pore fluid according to a Wood model to calculate an effective stress coefficient Alpha and an Skempton coefficient B; and estimating the formation pressure according to an effective stress between the Skempton coefficient B and a porous media, the effective stress coefficient Alpha and the Skempton coefficient B. The method is suitable for a mixed lithology and a single lithology, the formation pressure is estimated without relying on a conventional under compaction theory of a mudstone or a shale, so that the calculated formation pressure is more close to real formation pressure.
Owner:CHINA PETROLEUM & CHEM CORP +1
Automated borehole geology and petrophysics interpretation using image logs
ActiveUS7133779B2Readily apparentElectric/magnetic detection for well-loggingSeismic signal processingModel parametersComputer science
A method of characterizing a borehole traversing an earth formation including (a) obtaining an array of data from a formation characterization tool, wherein the data describes a section of the borehole; (b) computing at least one spatial characteristic describing the relative position of pairs of data; (c) assigning said pairs of data to bins based on the spatial characteristic, wherein the size of the bins are selected based on the tool; (d) transforming the data to petrophysical properties of the borehole; (e) calculating the variance of each bin; (f) developing a model of the variances; (g) determining at least one geostatistical parameter using the model; and (h) upscaling the geostatistical parameters to characterize a region of said earth formation. The method may further include generating a heterogeneity index log using the geostatistical model parameters. The method may be implemented using a computer program product for processing and interpreting borehole data.
Owner:SCHLUMBERGER TECH CORP
A simulation-to-seismic workflow construed from core based rock typing and enhanced by rock replacement modeling
The disclosed embodiments include a system and method for performing a simulation to seismic process. In one embodiment, the system is configured to perform operations comprising constructing a petrophysical realization and selecting a candidate model for fluid flow simulation using the petrophysical realization. Empirical petrofacies definitions is applied on the selected candidate model and assigning relative permeability at each node of the petrofacies definitions of the selected candidate model. The operations performs flow simulation on selected candidate model and performs analysis on the results of the simulation on selected candidate model to verify rock type flow units. The dynamic and static simulation results are synthesized such that the combined data yield a measurable rock property that may be compared to seismic properties and used to calibrate subsequent iterations of the static earth model. The continued iteration of the workflow may then be undertaken with the updated / refined earth model.
Owner:LANDMARK GRAPHICS
Angle gather seismic response numerical computation method of reservoir fluid fluidity
InactiveCN104155693AFull reflectionFully reflect the contributionSeismic signal processingSpecial data processing applicationsElastica theoryPetroleum
The invention discloses an angle gather seismic response numerical computation method of reservoir fluid fluidity, and relates to a petroleum seismic exploration data processing and explanation technology. According to the angle gather seismic response numerical computation method of reservoir fluid fluidity, pre-stack angle gather seismic normalization of reservoir fluid fluidity is achieved. First, on the basis of petrophysics and the theory of elasticity of holes containing fluid mediums, frequency relevancy longitudinal wave and transverse wave speed parameters of all the segments or layers of log data or a synthetic geologic model, and a reservoir physical parameter geologic model containing different levels of fluid fluidity is obtained; second, a two-dimensional angle and frequency domain AVO seismic reflection coefficient distribution formula is utilized for obtaining an incident angle and frequency domain AVO reflection coefficient distribution model changing along with the incident angle and the frequency at the same time; third, a scalar diffusion viscosity equation is used for performing forward calculation of a seismic wave field to obtain pre-stack angle gather data. The angle gather seismic response numerical computation method of reservoir fluid fluidity can be used for describing influences of reservoir fluid fluidity on a pre-stack angle gather seismic response and the corresponding relation between the reservoir fluid fluidity and the pre-stack angle gather seismic response, and provides more reliable guidance for recognition of oil gas in reservoirs in oil gas seismic exploration.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Method for representing physics features of deep carbonate rocks
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Petrophysical method for predicting plastic mechanical properties in rock formations
InactiveUS8498853B2Computation using non-denominational number representationGeological measurementsLithologyGeographic regions
Owner:EXXONMOBIL UPSTREAM RES CO
Integrated workflow or method for petrophysical rock typing in carbonates
Disclosed are various embodiments of a workflow or method for petrophysical rock typing of carbonates in an oil or gas reservoir or field comprising determining a Data Scenario (DS) for the reservoir or field, determining a plurality of Depositional Rock Types (DRTs) for the reservoir or field, determining a Digenetic Modification (DM) from a plurality of diagenetic modifiers or primary textures associated with the plurality of DRTs, selecting a Reservoir Type (RT) corresponding to the plurality of DRTs,determining at least one pore type, and determining, on the basis of the plurality of DRTs, the Diagenetic Modification (DM), and the at least one pore type, a plurality of Petrophysical Rock Types (PRTs) associated with the RT.
Owner:CHEVROU USA INC
Method for calculating shear wave velocity of sandstone formation
InactiveCN104570064AAvoid uncertaintyFew parametersSeismic signal processingLongitudinal waveVolumetric Mass Density
The invention provides a method for calculating shear wave velocity of a sandstone formation, and belongs to the field of rock physics and geophysical logging. The method comprises the following steps: (1) inputting an actually-measured longitudinal wave velocity Vp, density, porosity phi and a shale content Vsh curve of the sandstone formation, and setting an initial value and an interval of a consolidation coefficient c; (2) calculating a dry rock elastic modulus; (3) calculating a saturated rock elastic modulus, and calculating to obtain a calculated longitudinal wave velocity; (4) establishing an error function between the actually-measured longitudinal wave velocity Vp and the calculated longitudinal wave velocity; (5) within the value range of the consolidation coefficient c, changing the value of the consolidation coefficient c by using the interval, repeating the step (2) to the step (4) once when the changing is implemented every time to obtain the error function corresponding to each new consolidation coefficient c, comparing the error functions corresponding to all the consolidation coefficients c to find a consolidation coefficient c' which enables the error function to be minimum, and calculating the obtained shear wave velocity, namely the solved shear wave velocity, by virtue of the consolidation coefficient c' which enables the error function to be minimum.
Owner:CHINA PETROLEUM & CHEM CORP +1
Multi-scale multi-component digital core construction method and system based on image fusion
PendingCN113609696AFully understand the pore structure characteristicsImage enhancementMaterial analysis using wave/particle radiationWell loggingReservoir evaluation
The invention discloses a multi-scale multi-component digital core construction method and system based on image fusion, and belongs to the field of petrophysics and petroleum logging, and the method comprises the following steps: S1, preparing a core slice, i. e., carrying out imaging and mineral component analysis on the slice to obtain a mineral type, a micropore development degree and a mineral density sequence in imaging; S2, extracting two-dimensional pores in MAPS imaging, determining core pore diameter size distribution characteristics, further determining a proper scanning area, and drilling a sub-sample for X-ray CT scanning; S3, reconstructing the sample subjected to X-ray CT scanning to obtain a three-dimensional grey-scale map, and performing multi-threshold segmentation to obtain a multi-component three-dimensional digital rock core; and S4, adding the pores extracted by the MAPS into the multi-component digital rock core to obtain the multi-scale multi-component digital rock core. The problem of contradiction between the scanning sample size and the scanning resolution can be effectively solved, and the application of the digital rock physics technology in unconventional reservoir evaluation is expanded.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
Method and system for interpreting shale reservoir fractureability based on statistical petrophysics
InactiveCN109407150AOptimizing Fractability Evaluation CriteriaImprove interpretation accuracySeismic signal processingFaciesPetrophysics
The present application provides a method and system for interpreting the shale reservoir fractureability based on statistical petrophysics. The method comprises subjecting the acquired logging data of each facies to kernel function non-parametric probability density estimation so as to generate two-dimensional probability density functions corresponding to preset seismic attribute combinations; by using a Bayesian classification criterion, performing self-classification screening on each of the seismic attribute combinations according to each of the two-dimensional probability density functions to generate an optimal seismic attribute combination; and performing seismic inversion on the acquired seismic data to generate an inversion profile corresponding to the optimal seismic attribute combination; and by using the Bayesian classification criterion, performing fractureability interpretation on the inversion profile corresponding to the optimal seismic attribute combination accordingto the two-dimensional probability density function corresponding to the optimal seismic attribute combination. The method has the beneficial effects of taking account of the respective advantages ofa mineral brittleness index and an elastic brittleness index, optimizing the evaluation criterion of shale fractureability and improving the accuracy of seismic fractureability quantitative seismic interpretation.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Characterization of Porous Materials Using Gas Expansion Induced Water Intrusion Porosimetry
Determination of transport phenomena properties in porous media is one major objective of core analysis studies in petrophysics, reservoir engineering, and groundwater hydrology. Porosity measurement may be considered as a key factor to identify the hydraulic performance of a low permeable porous medium (e.g. rock or concrete). Additionally, the rate of absorption under pressure depends on the permeability, which is related to the connectivity between the existing pores within the porous structure. An alternative Gas Expansion Induced Water Intrusion Porosimetry (GEIWIP) method and apparatus is useful to measure the total porosity and pore size distribution, using a gas / water intrusion apparatus for water tight materials.
Owner:UNIVERSITY OF MANITOBA
Ideal formation factor determination method, hydrocarbon saturation determination method and porosity effectiveness evaluation method
InactiveCN105240003ARemove conductivityThe recognition effect is accurateSurveyRock samplePetrophysics
The invention discloses an ideal formation factor determination method, a hydrocarbon saturation determination method and a porosity effectiveness evaluation method. The ideal formation factor determination method includes: acquiring permeability K of a rock sample according to a rock physical experiment; acquiring an ideal formation factor F* according to a corresponding relation between the permeability K and the ideal formation factor F*. The ideal formation factor determination method, the hydrocarbon saturation determination method and the porosity effectiveness evaluation method have the advantages that under the condition of poor porosity-permeability relation, the ideal formation factor can be directly calculated according to the permeability, porosity effectiveness evaluation and hydrocarbon saturation determination are further realized on the basis of the ideal formation factor, and accordingly precision in recognition and quantitative evaluation of hydrocarbon reservoirs can be realized, and the foundation is laid for establishment of petrophysics based reservoir parameter evaluation standards in the future.
Owner:SHANGHAI BRANCH CHINA OILFIELD SERVICES
Rock compressibility-based carbonatite stratum pore pressure calculating method
ActiveCN109577969AReduce the impactStrong theoreticalSurveyDesign optimisation/simulationData simulationPore water pressure
The invention provides a rock compressibility-based carbonatite stratum pore pressure calculating method. The method comprises, according to mechanical theories on rock porous elasticity, analyzing the constitutive relation between rock compressibility and pore pressure as well as effective stress, and combining the Biot-Willis effective stress las to establish a carbonatite pore pressure predicting quantitative model for representing the relation between pore pressure and rock compressibility; performing a large amount of lithostratigraphic compressibility testing and data simulation, according to a fit quantitative relation between lithostratigraphic compressibility and effective stress as well as porosity, combining with carbonatite petrophysical simulation data to perform examination analysis of the pore pressure predicting quantitative model. Actual measurement shows that the pore pressure is high in correlation with key parameters in the pore pressure predicting quantitative model. From the perspective of petrophysics and based on the rock compressibility, the rock compressibility-based carbonatite stratum pore pressure calculating method theoretically establishes the quantitative model reflecting the pore pressure-rock compressibility constitutive relation and reduces influence of subjective cognition on pore pressure prediction.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Anisotropic rock physical modeling method for deep shale at high temperature and high pressure
An anisotropic rock physical modeling method for deep shale at high temperature and high pressure is provided. The core of the method is an anisotropic rock physical modeling method combining variousanisotropic rock physical models with a high-temperature and high-pressure correction model. The method is based on multiple disciplines such as petrophysics, mathematical modeling and geophysics. Well logging and rock core data are converted into a longitudinal and transverse wave velocity model. The problem of simulation of the equivalent velocity of an anisotropic medium in an underground deephigh-temperature and high-pressure environment is solved.
Owner:SOUTHWEST PETROLEUM UNIV
Quantitative rock Biot coefficient calculation method considering multiple influence factors
ActiveCN111368245AEasy accessImprove versatilityPermeability/surface area analysisComplex mathematical operationsLithologyWell logging
The invention belongs to the technical field of petrophysics, and discloses a quantitative rock Biot coefficient calculation method considering multiple influence factors. The method comprises the steps that according to a conventional logging curve, determining a saturated rock bulk modulus and a pore mixed fluid equivalent bulk modulus under the corresponding depth of the logging point; the rockmatrix mineral bulk modulus corresponding to a logging point is determined by utilizing a self-adaptive matrix mineral modulus inversion theory, then comprehensive pore structure parameters representing a rock pore structure are calculated, and finally a quantitative rock Biot coefficient considering multiple influence factors is calculated. According to the Biot coefficient expression provided by the invention, the accuracy of estimating the Biot coefficient is improved, lithology limitation is avoided, and the universality of the calculation expression is improved.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Device and method for measuring ground stress by using core of oil well
InactiveCN104697672AAccurate measurementSave on high costsForce measurementUsing optical meansLaser transmitterEyepiece
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
Digital rock core acoustic characteristic analysis method at different temperatures
PendingCN111680440AHigh resolutionDesign optimisation/simulationSpecial data processing applicationsShear modulusRock core
The invention relates to the technical field of petrophysics, in particular to a rock acoustic characteristic analysis method based on a digital rock core. The invention discloses a digital rock coreacoustic characteristic analysis method at different temperatures. The method comprises the following steps: A, constructing a multi-component three-dimensional digital rock core; B, calculating the bulk modulus and shear modulus of each component in the digital rock core at different temperatures; and C, calculating the stress-strain of the digital rock core by taking the result obtained in the step B as an input parameter, and obtaining the elastic modulus and the sound wave speed through the stress-strain. According to the invention, the construction of the high-resolution digital rock coreis realized, the relationship between the elasticity modulus and the temperature is constructed, and a digital rock core acoustic parameter simulation method at different temperatures is developed. By simulating the elasticity modulus and the sound wave speed of the rock core at different temperatures, the change rule of the temperature on the acoustic characteristics and the electrical characteristics of the rock is analyzed.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING) +1
Determination method and device of oil deposit water saturation
ActiveCN110219643AShort timeEasy to operateClimate change adaptationBorehole/well accessoriesRock coreLongitudinal wave
The invention provides a determination method and device of oil deposit water saturation. The determination method includes the steps that petrophysical parameters and seepage parameters are obtainedfrom oil deposit data; a longitudinal wave velocity field is determined according to seismic data; and a Biot equation is used for determine the oil deposit water saturation according to the oil deposit petrophysical parameters, seepage parameters, and determined longitudinal wave velocity field. According to the determination method and device, a petrophysics experiment, digital core experiment and well production record are used, other petrophysical parameters and seepage parameters in addition to the saturation related to longitudinal wave velocity and relation between the water saturationand the longitudinal wave velocity in the Biot equation are combined, and thus the oil deposit water saturation is determined. The determination method is short in time and high in operability, and large-scale application technology prospect is realized.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Pre-stack fracture quantitative prediction method and system based on rock physics
ActiveCN105629303BPrecise deploymentRealize Quantitative EstimationSeismic signal processingLongitudinal waveEquation of the center
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
A Quantitative Characterization Method of Shale Compressibility Based on Petrophysics
ActiveCN104749622BImprove description accuracyGood application effect and promotion prospectSeismic signal processingSpecial data processing applicationsEnvironmental geologyFracture pressure
The invention discloses a method for quantitatively characterizing the shale compressibility based on rock physics. The method comprises the following steps: (1) establishing a shale compressibility mathematical model; (2) analyzing the relationship between formation parameters and mechanics, and preferably selecting formation mechanical parameter characterizing factors; (3) regressively fitting a compressive strength elastic parameter characterization formula and establishing a formation fracture pressure elastic parameter characterization formula and a principal stress elastic parameter characterization formula; (4) establishing a compressibility index characterization formula, and verifying and calculating a compressibility index comprehensive data body; and (5) quantitatively characterizing and predicting the formation compressibility. According to the method, effective characterization factors of shale formation compressibility are selected through multi-parameter analysis to establish a shale compressibility index characterization formula, so that quantitatively characterization of shale compressibility is realized, the identification standard of shale compressibility is established, target optimization of formation fracturing reformation layers can be guided, the cost of shale exploration is reduced, and the success rate of shale exploration is effectively improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
Anisotropic petrophysical calibration method based on shale crystal geometrical factor orientation function
The invention discloses an anisotropic petrophysical calibration method based on a shale crystal geometrical factor orientation function. The core of the method is to use multiple anisotropic petrophysical models in combination of the crystal geometrical factor function. The method, based on multiple disciplines such as petrophysics, crystallography, mathematical modeling and like, converts well logging and core data to P-wave and S-wave velocity models and solves the problem of simulation of equivalent velocities in underground anisotropic media.
Owner:SOUTHWEST PETROLEUM UNIV
Examination success rate prediction device and method, readable medium and electronic equipment
The invention relates to an examination success rate prediction device and method, a readable medium and electronic equipment. According to the technical scheme provided by the embodiment of the invention, based on the upper and lower limit theory of petrophysics, the score of the target part of each single subject is taken as the score under the relatively easy condition, and each upper limit index of the single subject is obtained by combining the total score of the target part and the percentage of each recording line; the method also includes taking the total score of the single family obtained by the shortened time simulation test as a score under a relatively difficult condition, and obtaining each lower limit index of the single family in combination with the total score of the single family and the percentage of each admission line; and obtaining the examination success rate of the single family based on the average value of each upper limit index and each lower limit index. Therefore, the technical scheme provided by the embodiment of the invention can automatically calculate the single-subject examination success rate, and has the advantages of simplicity and rapidness.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
A Method for Calculating Pore Pressure in Carbonate Formation Based on Rock Compressibility Coefficient
ActiveCN109577969BStrong theoreticalSolving Difficulties in Pore Pressure PredictionSurveyDesign optimisation/simulationQuantitative modelPetrophysics
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Carbonate Logging Correction and S-wave Velocity Prediction Method Based on Petrophysics
ActiveCN110703330BEliminate the effects ofSimple to determineSeismic signal processingRock coreWell logging
Owner:CHINA PETROLEUM & CHEM CORP +1
An anisotropic petrophysical calibration method based on the orientation function of shale crystal geometry factors
Owner:SOUTHWEST PETROLEUM UNIV
Device for measuring ground stress
InactiveCN108896224AAccurate measurementSave on high costsApparatus for force/torque/work measurementLaser transmitterEyepiece
The invention relates to a device for measuring ground stress. An adjustment screw seat is arranged at the bottom of an experimental plate; a leveler, a laser emitter, an optical filter, a single slit, a double slit, a light-shielding cylinder, an optical screen and a micro-metering eyepiece are successively installed on the top of the experimental plate; the leveler checks whether the experimental plate is horizontal by internal bubbles; the laser emitter emits monochromatic light having a wavelength [lambda], and selects red light having a long wavelength; the single slit is configured to form a linear light source; and the micro-metering eyepiece is configured to measure the distance between bright stripes. The device is reasonable in design, simple in structure, easy to operate, easy to machine, easy to carry, low in cost, not only can accurately measure rock strain, but also can determine the magnitude of ground stress by using petrologic parameters, has important guidance significance to efficient oilfield development, and can be used in an oilfield core library because of good portability and good practicality.
Owner:宋协翠
Mobile App to Allow for Instant and Real-Time Integration of Geology, Petrophysics, Reservoir Engineering, Production Technology, Petroleum Engineering, Production Engineering, and Process Engineering Disciplines on a Single Interface by an Individual to Display Oil Field Production Data and Information and to Conduct Oil Field Production Surveillance and Optimization Using a Mobile Device
InactiveUS20180349813A1Easy accessImprove convenienceResourcesBorehole/well accessoriesMobile appsAnalysis data
A mobile app is developed to seamlessly integrate oil field production data and information coming from geology and engineering disciplines to conduct fully integrated surface and subsurface evaluation of well and reservoir performance with a single application software for optimising daily production and maximising recovery factor in real time. The mobile app would also allow for 3D visualization of static and dynamic models on mobile devices which would allow for field engineers instant, real-time, and seamless understanding of subsurface status of the oil producing wells that would not only enable prompt and accurate decision making process but also assist in simplifying the process by ease of access to all stakeholders.The mobile app would permit real-time integration across disciplines on a single interface to instantly process and analyze data and information in order to clearly evaluate on-going field production and identify challenges. It would represent a seamless production surveillance and optimization tool that would instantly integrate and display relevant field production data and subsurface information, which is invaluable to top level management, engineers, and field personnel during decision making process.
Owner:BASU SUBHAYU
A method for obtaining the electrical properties of tight sandstone rocks using digital cores
The invention discloses a method for obtaining electrical properties of tight sandstone rocks by using digital rock cores, and relates to the field of rock physics. Taking tight sandstone gas layer rocks as the research object, digital cores are established through slice images scanned by micro-CT, and the pore structure parameters of the cores are extracted. The lattice Boltzmann method is used to simulate the distribution of gas and water phases in rocks at different saturations, and based on this, the influence of microscopic pore structure and wettability of tight sandstone on its resistivity characteristics is studied. The invention utilizes the digital rock core technology to just make up for the deficiency of the traditional experiment.
Owner:SOUTHWEST PETROLEUM UNIV
Method and system for improving logging shear wave velocity prediction precision
PendingCN112558152AImprove forecast accuracyImproving the Prediction Accuracy of Logging Shear Wave VelocitySeismic signal processingSeismology for water-loggingWell loggingClassical mechanics
The invention provides a method and a system for improving logging shear wave velocity prediction precision, and belongs to the technical field of petrophysics and geophysical logging. The method comprises the steps that the regression relation between pore structure parameters of characteristic wells in a work area and the porosity and the shale content is counted, and the transverse wave speed of a to-be-predicted well in the work area is predicted through the regression relation, wherein the characteristic well is a well logging with transverse wave well logging information in the work area, and the to-be-predicted well is a well logging without transverse wave well logging information in the work area, namely a well logging needing to predict the transverse wave speed. According to themethod, rock pore structure parameters are introduced into logging shear wave velocity prediction, so that the logging shear wave velocity prediction precision is improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
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