11 results about "Saturation distribution" patented technology

The application discloses a method and device for determining gas saturation distribution of gas drive reservoir, equipment and medium. The method comprises the following steps: obtaining the static parameters of the target reservoir; determining the oil-gas phase permeation curve according to the static parameters of the reservoir, and determining the gas drive reservoir flow rate corresponding to the oil-gas phase permeation curve; constructing the gas drive reservoir gas saturation control equation of the one-dimensional homogeneous flow pipe model according to the gas drive reservoir flow rate; solving the gas drive reservoir gas saturation control equation by using the fully implicit difference method, and determining the gas drive reservoir gas saturation distribution result of the target reservoir. According to the technical scheme, the gas drive saturation simulation is realized quickly, stably and automatically by constructing the gas drive reservoir gas saturation control equation and solving the equation by using the fully implicit difference method, the dynamic analysis efficiency and precision of the gas drive reservoir are improved, and reliable data are provided for the gas drive development optimization.

The application provides a method and device for simulating CO2 migration based on printing method for constructing rhythmic strata, and relates to the field of underground multiphase percolation. The method comprises the following steps: according to the rhythmic characteristics of the strata, layer by layer filling fillers with different particle sizes in a visualizing cavity according to the layer thickness and fluctuation set by the parameterized boundary function, so as to form a strata model with the required rhythmic strata structure; injecting a wet phase fluid into the visualizing cavity, and after the rhythmic strata are completely immersed in the wet phase fluid, standing still and synchronously collecting the internal images of the strata model; injecting a dyed non-wetting phase fluid into the visualizing cavity from the bottom of the visualizing cavity, and synchronously collecting the internal images of the strata model; processing the collected images by a light field correction method, calculating the pixel absorbance and inverting the non-wetting phase saturation distribution. The method can reproduce complex sedimentary rhythmic layering under controllable conditions in the laboratory, and intuitively reveal the control effect of the complex rhythmic layering on CO2 migration, residual capture and dispersion risk.

The present application relates to the technical field of oil reservoir engineering, and is a method for calculating oil saturation of a horizontal section of a pilot hole converted into a horizontal well, which comprises: obtaining equivalent oil contents of light oil, medium oil and heavy oil in a horizontal section of a pilot hole converted into a horizontal well; determining an oiliness index of the horizontal section; and calculating the oil saturation of the horizontal section according to the equivalent oil contents of the light oil, the medium oil and the heavy oil and the oiliness index. The present application obtains the equivalent oil contents of the light oil, the medium oil and the heavy oil and the oiliness index of the horizontal section based on quantitative fluorescence logging technology, determines the oil saturation of the horizontal section, realizes fast and accurate acquisition of the oil saturation distribution of the horizontal section of the horizontal well, and provides a scientific basis for oilfield exploration and development and selection of fractured well sections.

The invention relates to the technical field of oil field reservoir research, in particular to a core displacement fluid in-situ dynamic inversion method and system based on multi-frequency resistance and capacitance coupling tomography, which comprises the following steps of: performing capacitance modal detection and resistance modal detection at the current time step by utilizing multi-frequency signal synchronous excitation in displacement simulation; a corresponding bimodal electric signal is obtained; fusing the bimodal electric signals according to modal optimization conditions; obtaining corresponding oil / water / gas three-dimensional saturation distribution inversion data based on the saturation inversion model; fitting is carried out based on the error between the oil / water / gas three-dimensional saturation distribution calculation data and the inversion data, and a fitting relative permeability result is output. The core displacement fluid in-situ dynamic inversion method integrating multi-modal detection, modal optimization, saturation inversion and relative permeability fitting is constructed, the cost is low, the size is small, the response frequency is high, and implementation of capacitance modal detection and resistance modal detection and inversion based on a saturation inversion model are not limited by the application environment.

The application provides an evaluation method of remaining oil re-enrichment quality, comprising the following steps: (1) obtaining the remaining oil saturation distribution before and after enrichment through remaining oil re-enrichment physical simulation or numerical simulation research; (2) calculating the flow rate curve; (3) calculating the enrichment state value distribution of the remaining oil before and after enrichment; (4) determining the evaluation index and evaluation standard of the remaining oil re-enrichment quality; and (5) evaluating the remaining oil re-enrichment quality. The evaluation method of the remaining oil re-enrichment quality of the high water cut reservoir has the characteristics of simple operation, quick calculation and clear target, can intuitively divide the remaining oil re-enriched in the high water cut reservoir into different types, thereby providing decision reference for tapping the potential of the remaining oil, and has a relatively practical engineering application value.

This invention provides a method, system, device, and storage medium for predicting sandstone permeability. The method includes: acquiring a first or second permeability prediction model; acquiring the geometric mean of the pore radius or the NMR T2 distribution within the range of transverse relaxation time >40ms corresponding to a cumulative mercury saturation of 20% for the target sample, as well as the cumulative mercury saturation distribution of the high-pressure mercury intrusion pore size or the cumulative percentage distribution of the NMR pore size; acquiring the lower limit of the pore size of the movable fluid storage space of the target sample and using it as the boundary point for fractal analysis; combining the aforementioned cumulative mercury saturation distribution of the high-pressure mercury intrusion pore size or the cumulative percentage distribution of the NMR pore size to determine the first or second fractal dimension of the target sample; determining the permeability of the target sample using the first permeability prediction model based on the aforementioned pore radius and first fractal dimension, or determining the permeability of the target sample using the second permeability prediction model based on the aforementioned geometric mean and second fractal dimension.

This invention relates to the field of oilfield reservoir research technology, specifically a method and system for in-situ dynamic inversion of core displacement fluids based on multi-frequency resistive and capacitive coupled tomography. The method includes: synchronously exciting capacitive and resistive modes at the current time step using multi-frequency signals during displacement simulation to obtain corresponding dual-mode electrical signals; fusing the dual-mode electrical signals according to mode optimization conditions; obtaining corresponding three-dimensional saturation distribution inversion data for oil / water / gas based on a saturation inversion model; and fitting the error between the calculated and inverted data based on the three-dimensional saturation distribution of oil / water / gas to output the fitted relative permeability result. This invention constructs an in-situ dynamic inversion method for core displacement fluids integrating multi-mode detection, mode optimization, saturation inversion, and relative permeability fitting. It is low-cost, compact, and has a high response frequency. Furthermore, the implementation of capacitive and resistive mode detection and the inversion based on the saturation inversion model are not limited by the application environment.

The invention relates to the technical field of gas field development dynamic monitoring, in particular to a remaining oil saturation distribution high-precision real-time monitoring method based on distributed optical fibers. The method comprises the following steps: acquiring a continuous shaft real-time temperature profile based on distributed temperature sensing devices arranged in a plurality of monitoring wells; inputting the data into a shaft-oil reservoir coupling model constructed based on the law of conservation of mass, momentum and energy to carry out nonlinear inversion, and accurately calculating a layered flow profile along the well depth direction; deducing an oil saturation profile of a stratum corresponding to each well according to a multiphase seepage mechanism by combining the layered flow and a preset oil-water relative permeability curve; and finally, projecting each well profile to a three-dimensional geological grid through multi-well linkage, updating in real time, and constructing a three-dimensional remaining oil saturation distribution field of the target oil reservoir, thereby realizing continuous, real-time and high-precision three-dimensional online monitoring on the remaining oil saturation of the whole oil reservoir.

The invention discloses a method for accurately monitoring saturation distribution of hydrates in sediments, and the method comprises the steps: building a resistivity and sound wave collection device which comprises a hydrate sample preparation module, a pressure test module, a temperature test module, a resistivity parameter test module and an acoustic parameter test module; carrying out a simulation experiment to obtain temperature, pressure, sound wave and resistance data; converting the measured resistance data into two-dimensional resistivity data by using a resistivity tomography technology; utilizing the optimized acoustic rock physical model to inversely calculate the hydrate saturation; optimizing the resistivity inversion hydrate saturation based on the calculated hydrate saturation and the obtained two-dimensional resistivity data to obtain two-dimensional saturation data; and based on the two-dimensional saturation data, establishing a three-dimensional image of the hydrate saturation by adopting a sequential Gaussian simulation method. According to the method, the calculation precision of the hydrate saturation is improved, the distribution of the hydrate saturation is accurately imaged, and data support is provided for hydrate reservoir evaluation.

This invention belongs to the field of oil and gas development, specifically relating to a method for characterizing reservoir water cut distribution. The method includes: establishing oil-water phase permeability curves based on experiments measuring the relative permeability of two-phase fluids in rocks; combining this with reservoir water saturation data to obtain oil phase relative permeability field data and water phase relative permeability field data; establishing fitting relationships between crude oil viscosity and reservoir pressure, and between crude oil volume coefficient and reservoir pressure, based on reservoir fluid property analysis experiments; combining this with reservoir pressure data to obtain oil phase viscosity field data and oil phase volume coefficient field data; establishing a water cut calculation formula; and establishing a reservoir numerical model based on the calculation formula to generate a water cut distribution map. The water cut distribution map generated using this method can characterize the water cut distribution at different stages of reservoir development, providing a more refined representation of reservoir water cut distribution and potential, and offering a more scientific basis for evaluating water drive development effectiveness and formulating reservoir adjustment plans.

The invention relates to an oil saturation distribution measuring method suitable for an open system, which comprises the following steps: dyeing non-wetting phase oil, keeping wetting phase water colorless, and when the dyed oil is injected into a visual seepage model of saturated water, measuring the oil saturation distribution of the open system. An oil phase greatly absorbs a spectrum which does not correspond to the color of the oil phase, a linear relation exists between the light intensity attenuation of the spectrum and the corresponding oil quantity, and a quantitative relation between the light intensity attenuation and the corresponding oil quantity is established through dynamic calibration, so that a calibration coefficient is obtained and used for calculating the oil saturation distribution in the medium. According to the fluid saturation measuring method provided by the invention, the saturation and the optical signal have a good linear relationship, and the measuring precision is high.