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1441results about "Analysis using nuclear magnetic resonance" patented technology

Carbon dioxide oil-displacing nmr imaging detection device

A carbon dioxide drive nuclear magnetic resonance imaging detection device belongs to the technical field of petroleum engineering and technology. The detection device comprises: a simulation core device which is arranged in a nuclear magnetic resonance imaging device; an injection system which sequentially injects formation water, crude oil and supercritical carbon oxide into the simulation core device; a measurement and control system which is employed to control pressure and temperature of the whole system; the nuclear magnetic resonance imaging device which is employed to detect and perform quantitative analysis on an image to be tested to obtain voidage and permeability of a porous medium, and saturation seepage parameters of the supercritical carbon oxide, the formation water and the crude oil; and an output measuring system which is employed to measure volumes of the carbon dioxide gas, the formation water and the crude oil. The detection device has a design pressure of 0-40MPa and design temperature of 0-180 DEG C, and can simulate experimental studies of different displacement schemes of the supercritical CO2 under a complex petroleum reservoir condition; the simulation core device is made of a brass material, which produces no magnetism, satisfies requirements for high pressure and strength, has a compact structure, can be recycled, is conveniently operated, simple and applicable in an experimentation.
Owner:DALIAN UNIV OF TECH

High-resolution three-dimensional digital rock core modeling method

The invention discloses a high-resolution digital rock core modeling method. The high-resolution digital rock core modeling method comprises the following steps: firstly, scanning a rock core by X-ray CT (computed tomography); then acquiring the rock throat radius distribution from rock core mercury data, acquiring the rock core porosity radius distribution from rock core nuclear magnetism data, intercepting the part the pore throat radius of which is less than the CT scanning resolution as an input parameter of a random network method, wherein the selected intercepted value is relevant to the CT scanning resolution; comparing the digital rock core porosity obtained by CT scanning with the experiment measurement porosity, calculating the size of the lost porosity of the digital rock core by CT scanning, and constructing a porosity network model by utilizing the intercepted pore throat radius distribution by adopting the random network method, wherein the porosity of the generated network model is consistent with the porosity lost in CT scanning; and converting the porosity network model into the micro porosity digital rock core by applying gridding method, and overlapping the digital rock core constructed by a mercury injection nuclear magnetism method to the digital rock core scanned by CT by adopting a multi-scale integration method. The method breaks through the restriction of CT scanning resolution.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA) +1

Shale micropore size and fluid distribution analysis method

The invention discloses a shale micropore size and fluid distribution analysis method. The shale micropore size and fluid distribution analysis method comprises the following steps that shale gas reservoir rock is collected, and a natural core is manufactured; the relaxation characteristic of hydrogen-contained fluid in core pores is measured through a nuclear magnetic resonance spectrometer, and a relaxation time T2 distribution map of clay water is obtained; the core is processed to obtain a saturated core, and a relaxation time T2 distribution map of saturated fluid and a summation curve are obtained; a T2 distribution map of effective fluid is obtained; a T2 distribution map of irreducible fluid and saturability Swi of bound water are obtained; a T2 distribution map of surplus water and water saturation Sw are obtained; the T2 distribution maps of the fluids are converted into a pore size distribution map, the shale clay deadline and the irreducible fluid deadline are obtained, and then the shale micropore size and fluid distribution are obtained. The nuclear magnetic resonance spectrometer is adopted, the pore size and distribution of the shale and size and distribution positions of water drops in the pores are analyzed quantitatively and qualitatively, and the result is reliable.
Owner:CHINA PETROLEUM & CHEM CORP +1

Evaluation testing method for damage of drilling fluid to compact gas reservoir

A disclosed evaluation testing method for damage of a drilling fluid to a compact gas reservoir comprises the following steps: drying a core sample, marking, performing uniform segmenting and slicing, and measuring the weight and other parameters of the dry core sample; putting the core segments into a fluid for infiltration and saturation; performing reverse centrifugation operation on the core segments, and acquiring the original water saturation Swi of the small core segment samples; measuring the nuclear magnetic resonance T2 spectrums of simulated stratum water and a filtrate of the drilling fluid and determining the difference; performing NMR imaging measurement on the fluid distribution state in the core; and putting the core segments into a core clamper of a drilling-fluid circulating instrument for measurement after the drilling fluid is circulated and calculating the water saturation Swi and the gas permeability K2 of the core segments, calculating the permeability damaging rate after infiltration of the drilling fluid by using the measurement results through comparison, so as to evaluate the damage degree caused by infiltration of the drilling fluid at different depths. The novel evaluation testing method for damage of a drilling fluid to compact and super compact gas reservoirs is established by improving an original slice method.
Owner:SOUTHWEST PETROLEUM UNIV

Method and device for calculating effective porosity of compact oil storage layer

InactiveCN105866009ASolve the key problem of effective porosity calculationOvercome the influence of small nuclear magnetic porosityPreparing sample for investigationAnalysis using nuclear magnetic resonanceNMR - Nuclear magnetic resonanceCut off value
The invention relates to a method and a device for calculating effective porosity of a compact oil storage layer. The method comprises the following steps: preparing a saturate rock sample; performing nuclear magnetic resonance measurement on the saturate rock sample, thereby acquiring T2 point amplitude of the saturate rock sample, nuclear magnetic porosity of the saturate rock sample and total amplitude of T2 spectrum of the saturate rock sample; performing dewatering treatment on the saturate rock sample under an effect of centrifugal force and performing the nuclear magnetic resonance measurement, thereby acquiring the T2 point amplitude of the centrifugal rock sample, the nuclear magnetic porosity of the centrifugal rock sample and the total amplitude of T2 spectrum of the centrifugal rock sample; acquiring the porosity component of the T2 point of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the porosity component of the T2 point of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; acquiring a T2 cut-off value according to the total amplitude of T2 spectrum of the saturate rock sample, the curve of T2 spectrum of the saturate rock sample, the total amplitude of T2 spectrum of the centrifugal rock sample and the curve of T2 spectrum of the centrifugal rock sample; utilizing the T2 cut-off value to acquire the valid saturability of the flowing fluid; calculating the effective porosity of the compact oil storage layer according to the valid saturability of the flowing fluid.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Rock core holder compatible with nuclear magnetic resonance

The invention relates to a rock core holder compatible with nuclear magnetic resonance, which can simulate pressures and temperatures of deep reservoirs, perform oil water displacement of a rock core under simulated formation conditions, and simultaneously perform nuclear magnetic resonance on-line measurement. According to the invention, a radio frequency coil is embedded in the rock core holder, and the signal to noise ratio is greatly increased when the rock core holder is compared with a conventional rock core holder. The rock core holder is made of nonmagnetic nonmetal materials, which avoids the damage of the magnetic field uniformity caused by magnetic materials, and also avoids the generation of eddy current in the holder by a pulse gradient. Compared with a conventional rock core holder, the invention not only greatly increases the signal to noise ratio, but also fully ensures the accuracy of nuclear magnetic resonance measurement results at a high temperature and a high pressure. The holder is applicable to on-line measurement of nuclear magnetic resonance relaxation spectra, diffusion-relaxation two-dimensional spectra, and imaging methods during rock core oil water displacement at a high temperature and a high pressure. In addition, the invention performs real-time tracking compensation of temperatures and pressures of ring-crush fluid, and thus ensures the reliability of rock core simulated formation conditions.
Owner:PEKING UNIV

Method for quantitatively evaluating pore throat change degree in stress sensitive process

The invention discloses a method for quantitatively evaluating the pore throat change degree in a stress sensitive process. The method comprises the following steps: taking a rock core used for an experiment, washing oil and drying, and measuring the porosity and the gas measured permeability of the rock core; preparing simulated formation water used for the experiment, wherein the simulated formation water reaches a formation water mineralization degree; selecting the displacement velocity of the simulated formation water; placing the rock core in a rock core clamping device; applying a confining pressure for displacing the rock core with the simulated formation water; calculating the water measured permeability according to the inlet pressure of the rock core and the displacement velocity, and measuring the nuclear magnetic resonance T2 spectrum under the confining pressure; gradually rising the confining pressure, and measuring the nuclear magnetic resonance T2 spectrums under different confining pressures; converting the nuclear magnetic resonance T2 spectrums under different confining pressures into pore throat radiuses r; drawing a pore throat radius distribution curve under different confining pressures, and measuring the pore throat change degrees under different confining pressures. According to the method, on-line measurement can be performed in real time; samples are not required to be unloaded and loaded repeatedly; the influence on pore throat change caused by the change of the confining pressure in the unloading and loading processes is avoided; therefore, the pore throat change degree in the stress sensitive process is quantitatively evaluated.
Owner:XI'AN PETROLEUM UNIVERSITY
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