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Method for calculating liquid apparent permeability of dual-wettability shale

A calculation method, dual wettability technology, applied in permeability/surface area analysis, computational theoretical chemistry, chemical property prediction, etc., can solve the problem of less research on liquid apparent permeability

Pending Publication Date: 2022-03-04
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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Problems solved by technology

At present, a large number of studies have been carried out on the apparent permeability of gases, but there are few studies on the apparent permeability of liquids.

Method used

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  • Method for calculating liquid apparent permeability of dual-wettability shale
  • Method for calculating liquid apparent permeability of dual-wettability shale
  • Method for calculating liquid apparent permeability of dual-wettability shale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0087] (1) Collect relevant parameters of shale matrix and water and other basic parameters, as shown in Table 1;

[0088] (2) The pore size distribution of organic matter and inorganic matter in shale was obtained by combining mercury injection method, low-temperature nitrogen adsorption method and chemical treatment with NaOCl. figure 2 shown;

[0089] (3) Obtain the linear fitting relationship between NMR signal quantity and porosity through nuclear magnetic resonance test, so as to obtain shale porosity;

[0090] (4) Use drop angle measurement method to directly measure the contact angle, and then calculate the contact angle of organic matter and inorganic matter. The contact angle of inorganic matter is in the range of 0-90°, and the contact angle of organic matter is 90-180 ° range;

[0091] (5) Substitute these parameters into the calculation formula of liquid apparent permeability to obtain the influence of different parameters on liquid apparent permeability.

[0...

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Abstract

The invention discloses a method for calculating liquid apparent permeability of dual-wettability shale. The method comprises the following steps: acquiring related parameters of a dual-wettability shale matrix and liquid; determining organic matter pore size distribution, inorganic matter pore size distribution and porosity of the dual-wettability shale; measuring an apparent contact angle of the dual-wettability shale matrix, and calculating an organic matter contact angle and an inorganic matter contact angle according to the apparent contact angle; and finally, calculating the liquid apparent permeability of the dual-wettability shale. According to the method, the transmission mechanism of organic matters and inorganic matters is considered, and parameters such as velocity distribution, density distribution, apparent viscosity, slippage length, shale pore tortuosity, porosity and the like are introduced into macroscopic permeability characterization of a shale matrix; and then, the structure parameters of the porous medium are combined with the single-tube model, various transport mechanisms are coupled, a unified liquid apparent permeability model is established, key input parameters are provided for accurate numerical simulation of shale gas, and the method has important theoretical and practical significance.

Description

technical field [0001] The invention relates to a method for calculating the liquid apparent permeability of biwettable shale, and belongs to the technical field of unconventional oil and gas development. Background technique [0002] Since the 21st century, with the rapid development of the economy, the world's energy consumption has continued to rise, and the consumption of traditional energy such as coal, oil, and conventional natural gas has gradually increased, and energy pressure has increased. Under the new situation of huge demand for energy, as an effective supplement to conventional oil and gas energy, unconventional energy including shale gas has been paid more and more attention. [0003] Shale gas reservoirs are generally characterized by low porosity and low permeability, and are difficult to exploit. Therefore, shale gas wells require reservoir fracturing to be exploited. During hydraulic fracturing operations, thousands of cubic meters of fracturing fluid a...

Claims

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Application Information

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IPC IPC(8): G01N15/08G16C20/30G16C10/00
CPCG01N15/08G16C20/30G16C10/00Y02A90/30
Inventor 卫其美赵立强李年银罗志峰刘平礼杜鹃
Owner SOUTHWEST PETROLEUM UNIV
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