Measuring characterization method for dynamical and pore-diameter characteristics of micro-pore surface of rock core

A dynamic and core technology, applied in the field of low-field variable-field nuclear magnetic resonance measurement and characterization, can solve the problems of difficult to characterize nano-pore dynamics and pore size characteristics, and achieve the effect of easy capture and robust pore size characteristics

Inactive Publication Date: 2018-11-27
TONGJI UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for measuring and characterizing the micropore surface dynamics and pore diameter characteristics of rock cores, so as to solve the problem of micropore and nanopore dynamics in shale and tight sandstone in unconventional oil and gas reservoirs, which are difficult to characterize by means of traditional oil and gas reservoir parameters. issues of geometry and aperture characteristics

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  • Measuring characterization method for dynamical and pore-diameter characteristics of micro-pore surface of rock core
  • Measuring characterization method for dynamical and pore-diameter characteristics of micro-pore surface of rock core
  • Measuring characterization method for dynamical and pore-diameter characteristics of micro-pore surface of rock core

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[0030] The present invention will be described in further detail below in combination with specific embodiments.

[0031] The present invention provides the dynamic seepage and pore size distribution of nano-micropores in cores (shale, tight sandstone) of unconventional oil and gas reservoirs. 1 H FFC NMRD measurement and characterization method, comprising the following steps:

[0032] 1. Prepare saturated core samples and measure porosity

[0033] Shale and tight sandstone cylindrical core samples with a diameter of 1inch or 10mm and a length of about 10cm. However, as long as they are suitable for the probe space, the size of these samples is not particularly limited, and the larger the volume, the higher the signal-to-noise ratio (S / N) High, and the smaller the gap between the sample and the probe, the better.

[0034] Use toluene or ethanol to clean the salt, organic matter, etc. in the core, put it in an oven and dry it at 115°C for 24 hours or until the quality does n...

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Abstract

The invention discloses a measuring characterization method for dynamical and pore-diameter characteristics of a micro-pore surface of a rock core. The method comprises the following steps: (1) preparing a sample; (2) performing low-field nuclear change field 1H NMRD measurement on the sample, thereby acquiring an evolving curve of longitudinal magnetization intensity in each field intensity alongwith the time; (3) calculating the distribution of longitudinal relaxation time T1; (4) calculating a distribution curve of all the field intensities and longitudinal relaxation rate R (R=1/T1), namely an NMRD curve; (5) adopting the NMRD curve for fitting a translation correlation time tau m and surface staying time tau s of liquid layer molecules of the micro-pore surface; (6) acquiring a kinetic parameter A of the micro-pore surface: A=tau s/tau m; (7) multiplying T1 by a factor, thereby acquiring the distribution of the pore diameter. The invention researches the micro-pore micro wettability of unconventional oil and gas reservoir by adopting a brand-new experimental method and a brand-new kinetic parameter. The distribution of T1 is utilized to realize the measurement on the distribution of the nanometer pore diameter of a compact rock core. As for the compact rock core, T1 is more stable and the signal thereof can be more easily acquired.

Description

technical field [0001] The invention belongs to the technical field of parameter characterization of oil and gas reservoirs, and in particular relates to the dynamic parameters of micropore surface and nanopore diameter of shale tight sandstone core in unconventional oil and gas reservoirs. 1 H Low-field variable-field nuclear magnetic resonance (FFC NMRD) measurement and characterization method. Background technique [0002] Reservoir parameters such as porosity, saturation, capillary pressure, permeability, wettability, etc. play a key role in the evaluation and development of oil and gas reservoirs. Unconventional oil and gas reservoirs refer to continuous or quasi-continuous accumulation of oil and gas resources that cannot obtain natural industrial production with traditional technologies and need new technologies to improve reservoir permeability or fluid viscosity to be economically exploited. There are two key parameters for unconventional oil and gas reservoirs: po...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 周兵
Owner TONGJI UNIV
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