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Core NMR t 2 Conversion Method of Spectral Relaxation Time and Mercury Injection Pore Throat Radius

A nuclear magnetic resonance and pore throat radius technology, applied in the field of oil and gas reservoir physics, can solve the problems of many steps, complicated calculation, large error in the final fitting result, etc., and achieves the effect of reliable results, reliable fitting results, and beneficial to research.

Active Publication Date: 2022-05-20
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

This conversion method is computationally complex, has many steps, and the error of the final fitting result is large

Method used

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  • Core NMR t <sub>2</sub> Conversion Method of Spectral Relaxation Time and Mercury Injection Pore Throat Radius
  • Core NMR t <sub>2</sub> Conversion Method of Spectral Relaxation Time and Mercury Injection Pore Throat Radius
  • Core NMR t <sub>2</sub> Conversion Method of Spectral Relaxation Time and Mercury Injection Pore Throat Radius

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Embodiment

[0035] The core nuclear magnetic resonance T of the present embodiment 2 The conversion method of spectrum relaxation time and mercury injection pore throat radius comprises the following steps:

[0036] (1) Select a piece of sandstone core, wash oil, dry and saturate the sandstone core with kerosene in sequence, then conduct nuclear magnetic resonance experiment, and measure the transverse relaxation time T of nuclear magnetic resonance 2 and signal strength. Take the non-zero value of the signal intensity, in order to correspond to the pore throat radius of the high-pressure mercury intrusion data, divide the NMR data by the transverse relaxation time T 2 Arrange in order from large to small, and calculate the cumulative percentage of signal strength, as shown in Table 1;

[0037] Table 1

[0038]

[0039]

[0040]

[0041] (2) The core was washed with oil and dried again, and then the high-pressure mercury injection experiment was carried out to measure the pore t...

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Abstract

The present invention discloses core nuclear magnetic resonance T 2 Spectrum relaxation time and mercury injection pore throat radius conversion method, the core is processed, and then the nuclear magnetic resonance experiment is performed on the core, and the transverse relaxation time T of the nuclear magnetic resonance is measured 2 and signal intensity, and calculate the cumulative percentage of signal intensity; reprocess the core and perform high-pressure mercury injection experiments, and measure the pore throat radius r and mercury saturation S hg , and the high-pressure mercury intrusion curve; in the NMR transverse relaxation time T 2 any time T 2 The cumulative percentage of signal strength at (i) is S heci (i), with S heci (i) Interpolate the high-pressure mercury intrusion curve as a standard to obtain the transverse relaxation time T 2 (i) The corresponding pore-throat radius r(i); respectively select the transverse relaxation time T obtained by interpolation 2 (i) and the two ends of the pore-throat radius r(i) and the two-end values ​​are fitted in sections to obtain the relationship between the transverse relaxation time at the two ends and the pore-throat radius, and the obtained relationship calculation is consistent with the remaining T 2 (i) corresponds to r(i). This method is less difficult to calculate, and the result is more accurate, and it can effectively convert the NMR T 2 Time converted to pore throat radius.

Description

technical field [0001] The invention belongs to the technical field of oil and gas layer physics, in particular to core nuclear magnetic resonance T 2 Conversion method of spectral relaxation time and mercury injection pore throat radius. Background technique [0002] The NMR mechanism shows that when the sample pores are filled with fluid, the H + Transverse relaxation motion in the pores, H + There will be a collision with the pore wall, and the movement will cause H + energy loss, making H + Return from high-energy state to low-energy state, namely H + the transverse relaxation process. The more frequent the collision, the H + The faster the energy loss, obviously, the size of the pores determines the H + The number of collision processes with the pore wall, the smaller the pore, the H + In the process of transverse relaxation, the probability of collision with the pores is greater, so it can be considered that the size of the pores is related to H + The relaxati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08G01V5/00
CPCY02A90/30
Inventor 任晓娟张鑫
Owner XI'AN PETROLEUM UNIVERSITY
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