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Characterizing method for pore volumes of full apertures of shale

A technology of pore volume and full pore diameter, which is applied in the fields of permeability/surface area analysis, suspension and porous material analysis, measuring devices, etc., to achieve an objective and reasonable effect of characterization

Active Publication Date: 2016-03-30
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] The present invention provides a characterization method of shale full-diameter pore volume, which is used to overcome the defects in the prior art of artificially dividing shale pore intervals and selecting experimental methods

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  • Characterizing method for pore volumes of full apertures of shale
  • Characterizing method for pore volumes of full apertures of shale
  • Characterizing method for pore volumes of full apertures of shale

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Embodiment

[0042] In this embodiment, the full-pore pore volume characterization of the shale in the southeast of Chongqing includes the following steps:

[0043] (1) Sample preparation: First, the shale is made into a cylinder with a diameter of 2.5 cm and a length of 3 cm by using a core bit and a core cutting device;

[0044] Take 10g of shale, crush it into powder with a diameter of 0.18mm, and divide it into two evenly to make the first powdery shale and the second powdery shale suitable for low-pressure nitrogen adsorption experiments and low-pressure carbon dioxide adsorption experiments.

[0045] (2) Sample pretreatment: Put the above three samples in a 110°C constant temperature box for 12 hours for dehydration; then use a vacuum pump to put the dehydrated sample at a pressure of 1.01325×10 -4 The degassing treatment is carried out under the condition of MPa, and the degassing time is 10 hours.

[0046] (3) Sample testing: Three independent experiments were carried out for the pretreated...

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Abstract

The invention provides a characterizing method for pore volumes of full apertures of shale. The characterizing method comprises the following steps: (1) respectively dewatering and degassing a columnar shale, first powdered shale and second powdered shale in sequence; (2) analyzing the columnar shale by a high-pressure mercury intrusion method, and obtaining a pore volume of each aperture within a first aperture range according to a washburn equation; (3) analyzing the first powdered shale by a nitrogen adsorption method, and obtaining a pore volume of each aperture within a second aperture range according to a BJH model; (4) analyzing the second powdered shale by a carbon dioxide adsorption method, and obtaining a pore volume of each aperture within a third aperture range according to a DFT model; (5) obtaining a pore volume of each aperture within a superposition range by a weighted average method according to the superposition range among the first aperture range, the second aperture range and the third average range. According to the characterizing method, the full apertures of a shale pore structure are objectively and reasonably characterized, and the method is greatly significant for correctly evaluating a shale reservoir.

Description

Technical field [0001] The invention relates to unconventional oil and gas exploration and development technology, in particular to a method for characterizing the full-pore pore volume of shale. Background technique [0002] Shale gas is a popular unconventional oil and gas resource today. Before shale development, in order to correctly evaluate shale reservoirs, it is necessary to quantitatively analyze and characterize the pore volumes of different pore sizes developed in shale reservoirs, so as to provide key parameters for the study of shale gas occurrence and flow , To avoid the economic loss of exploration and development or the loss of recoverable resources. [0003] Shale pores are several orders of magnitude smaller than conventional sandstone. The International Union of Theoretical and Applied Chemistry (IUPAC) divides the pores into micropores (<2.0nm), mesopores (2.0-50.0nm) and macropores (>50.0) according to the pore diameter. nm). At present, the methods fo...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0893
Inventor 姜振学李卓唐相路李卫兵黄何鑫
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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