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Experimental method for saturated shale pore fluid separation and saturation degree calculation

A technology of pore fluids and experimental methods, which is applied in the analysis of suspensions and porous materials, analysis of materials, permeability/surface area analysis, etc.

Active Publication Date: 2017-03-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Since conventional technical means cannot satisfy the micro-nano pore structure exploration of unconventional shale, NMR testing is applied as a fast and non-destructive core testing method

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  • Experimental method for saturated shale pore fluid separation and saturation degree calculation
  • Experimental method for saturated shale pore fluid separation and saturation degree calculation
  • Experimental method for saturated shale pore fluid separation and saturation degree calculation

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Embodiment Construction

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings. The following examples do not limit the present invention in any way, and all technical solutions obtained by means of equivalent replacement or equivalent transformation are within the protection scope of the present invention.

[0029] The shale sample in this example comes from the sedimentary shale in the Permian period, with a buried depth of 2810 m. XRD test shows that the total amount of clay minerals in the rock sample is 56%.

[0030] The nuclear magnetic resonance core testing instrument used in this example is a new type of NMR core analysis instrument produced by Magritek Company, the test temperature is 30° C., and the working frequency is 2 MHz; the centrifuge is an RC4500 centrifuge produced by VINCI Company.

[0031] 1. On-...

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Abstract

The invention discloses an experimental method for saturated shale pore fluid separation and saturation degree calculation. The method includes the steps that firstly, separation of movable water in saturated shale is carried out through two times of a high-speed centrifugation method, and then a vacuum gradient heating experiment is added to separate capillary bound water and clay bound water in pore fluid. In the whole process, by carrying out contrastive analysis on change rules of a core weight and residual fluid nuclear magnetic resonance relaxation time T2 distribution frequency spectrum obtained after each step is completed, the saturation degrees of the movable water in saturated core pores, the capillary bound water and the clay bound water are obtained, and the saturation degree distribution of the movable water in crack space and pore space is obtained. The nuclear magnetic resonance core analysis technology is further used for calculating the storage percentage of the movable water in shale cracks and large pores, and reference is provided for evaluation of seepage space of a shale reservoir.

Description

technical field [0001] The invention belongs to the technical field of evaluation of unconventional oil and gas reservoirs, and in particular relates to an experimental method for separating saturated shale pore fluid and calculating saturation. Background technique [0002] The acquisition of pore fluid parameters of unconventional shale has important guiding significance for shale reservoir evaluation and efficient development, because conventional pore fluid parameters (porosity, permeability, median radius, etc.) Seepage characteristics of shale reservoirs with characteristics such as porosity and low permeability. On the one hand, due to the high clay content of shale, the content of clay-bound water (crystallization water) is higher than that of conventional lithology, and the pore space occupied is larger than that of conventional lithology. At the same time, a large number of micropores and nanopores are developed in the shale, and the fine pores or roars increase t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/0893G01N24/081Y02A90/30
Inventor 谷建伟袁玉洁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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