SU528489A1 - Method for contactless measurement of pore size in capillary-porous media - Google Patents

Description

The invention relates to the field of porosimetry of caillus porous solids using the NMR method and can be used in the oil industry to study the collectible properties of oil-bearing rocks, in the fuel; And: Industrial, chemical technology, construction for the control of porous materials , as well as when conducting biopathic research on | Cellular: M. ur. A known method for measuring dimensions. when used and for which the sample is partially or partially destroyed by IL | And uncontrolled defensive mats. m. Results: measurements obtained by a known method require calibration and need to be corrected.

The most closest technical solution to the present invention is a non-contact pore measurement method, based on the phenomenon of limited self-diffusion of molecules W | Viscosity, B (key, nuclear) - (. Magnetic resonant measurements with pulsed gradiete magnitnogo gender.

Increasing the time interval between the pulse and the gradient of the magnetic field in the standard pulse width of the pulse sequence used to measure the self-diffusion coefficients to a value that exceeds the time during which the diffusing molecules travel a distance equal to the pore diameter , the amplitude c: .1 of the signal of a nuclear spnose echo ceases to be the head of the network, from the coefficient ca. modpuffs and molecules of the n, only the size of the pore is determined.

The only disadvantage of this method is that it allows for npodvdt measurements only in the case when all the lores in the sample are identical in size, which is rarely observed in practice.

For different dimensions, the holes of different sizes, the definition of the average size, and the distribution cords; pore size, but very much the same way as the pulse amplitude rpa; i: ieHT.i, the magnetic zero is increased / mined from pu.ch until ampl; There, the signal from the core of the sample is not reduced by 2.5 times, the area of the field gradient is measured twice, the area is doubled and the amplitude of the nuclear spin O is measured, but the amplitude is su .1 t about snri. Not distributed to pore sizes, but in area PM: gradpent pulses of a floor are judged on the average pore size of the sample.

The invention allows to study porous

5 samples; 1 adjoining pores of different sizes and, besides, allows to measure a larger number of sample parameters: average radius of norm, form. My and the width of the distribution function and along the radius. The time measured, and all these parameters are within 10 minutes. Many of these parameters, by the methods of the laboratories of the physics of the oil reservoir, take several hours and, as a result, lead to partial OR destruction of the samples.

An advantage of the method is that the sample can "mark a non-arbitrary geometric shape with a volume ranging from a few cubic centimeters to hundredths of a cubic centimeters." The method allows one to study the anisotropy of pore sizes and the 1lp name for studying Breeds with both open and closed -porosity. Measurement accuracy is 1–10%.

Claims (1)

Invention Formula The method is free of contact measurement in a cannllically porous medium, based on the phenomenon of limited self-diffusion of fluid molecules, including derno-magnetic resonance measurements with a pulsed gradient magnetic lol, so that measuring holes of different sizes, determining the average size and the width of the distribution of the holes and sizes, the amplitude of the magnetic field gradient pulses increase from zero to those holes until the amplitude of the signal of the nuclear sny echo from the sample core reduced by a factor of 2.5, the area of the Pradie nta tulle impulses is measured, the iB area is increased 2 times, and the amplitude of the nuclear spin echo signal is measured, and the amplitude of the pore size is measured for this amplitude, and the area of impulses is graded gender is the average size of the ent in a sample.