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Rock wettability evaluation method

An evaluation method and wettability technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of poor reproducibility, harsh test environment, complex measurement methods, etc., achieving high reproducibility and low requirements for preparation methods , the effect of high test accuracy and reliability of results

Inactive Publication Date: 2020-05-19
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in existing wettability measurement methods, such as complex measurement methods, harsh test environment, poor reproducibility, high limitations, and data reliability, the present invention provides a rock wettability evaluation method

Method used

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  • Rock wettability evaluation method

Examples

Experimental program
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Embodiment 1

[0037] see figure 1 , the device that described evaluation method adopts comprises vacuum dryer 1, gas drying tower 2, concentrated sulfuric acid bottle 3, anti-suction bottle 4 and vacuum pump 5, and the gas outlet of vacuum dryer 1 is communicated with gas drying tower 2, and described gas The drying tower 2 communicates with the concentrated sulfuric acid bottle 3 , the concentrated sulfuric acid bottle 3 communicates with the anti-suckback bottle 4 , and the other end of the anti-suckback bottle 4 communicates with the vacuum pump 5 . Anhydrous calcium sulfate is placed inside the gas drying tower 2 .

[0038] This embodiment takes the M-1 shale powder sample as an example to provide a shale wettability evaluation method, which includes the following steps:

[0039] Step a. Dry the shale sample M-1 at 100°C for 24 hours to obtain the sample to be tested, and record its mass m;

[0040] Step b, preparation of saturated saline solution, placed in such as figure 1 The bott...

Embodiment 2

[0048] In this embodiment, taking the M-5 shale powder sample as an example, a method for evaluating shale wettability is provided. The device used is the same as that in Example 1 and includes the following steps:

[0049] Step a. Dry the shale sample M-5 at 120°C for 8 hours to obtain the sample to be tested, and record its mass m;

[0050] Step b, preparation of saturated saline solution, placed in such as figure 1 The bottom of the vacuum desiccator 1 shown;

[0051] Step c, uniformly dispersing the sample M-5 to be tested in a mass of m b On the sample container, and spray distilled water on the sample to be tested to form a wet sample, the moisture content of the wet sample is 20%, record the total mass m of the sample container and the wet sample 1 , then place the sample container above the saturated saline solution, put a thermo-hygrometer 6 in the vacuum desiccator 1 at the same time, and then seal the vacuum desiccator 1 with vaseline;

[0052] Step d, turn on th...

Embodiment 3

[0058] In this embodiment, taking the M-7 shale powder sample as an example, a method for evaluating shale wettability is provided. The device used is the same as that in Example 1 and includes the following steps:

[0059] Step a. Dry the shale sample M-7 at 110°C for 12 hours to obtain the sample to be tested, and record its mass m;

[0060] Step b, preparation of saturated saline solution, placed in such as figure 1 The bottom of the vacuum desiccator 1 shown;

[0061] Step c, uniformly dispersing the sample M-7 to be tested in a mass of m b On the sample container, and spray distilled water on the sample to be tested to form a wet sample, the moisture content of the wet sample is 10%, record the total mass m of the sample container and the wet sample 1 , then place the sample container above the saturated saline solution, put a thermo-hygrometer 6 in the vacuum desiccator 1 at the same time, and then seal the vacuum desiccator 1 with vaseline;

[0062] Step d, turn on t...

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Abstract

The invention relates to the technical field of rock reservoir evaluation, and particularly discloses a rock wettability evaluation method. The evaluation method comprises the following steps: puttinga rock sample into a closed container filled with a saturated saline solution, wherein the saturated saline solution forms a constant humidity atmosphere in the closed container, the rock sample continuously absorbs moisture in air within a certain period of time until the constant weight is reached, and finally, the rock wettability can be quantitatively evaluated by acquiring a constant-humidity change curve and calculating the constant-weight duration, the constant-humidity rate and the moisture content. The balance humidity recovery test is carried out on the rock sample, quantitative evaluation is carried out on the rock wettability in three dimensions of accurately obtained measured value constant weight duration, constant humidity rate and moisture content, and the test accuracy and the result reliability are high; the method has no requirement on the specification of the to-be-detected sample, low requirement on the preparation method, suitability for various types of rocks, no interference of external factors and high reproducibility.

Description

technical field [0001] The invention relates to the technical field of rock reservoir evaluation, in particular to a rock wettability evaluation method. Background technique [0002] Rock wettability is commonly studied in conventional sandstone and carbonate reservoirs, but conventional reservoirs have high porosity and permeability, while unconventional rock reservoirs such as shale and tight sandstone usually have extremely low Pore-permeability, rock composition and pore structure are all characterized by strong heterogeneity, and the study of their wettability is more challenging. [0003] The wettability of shale determines the microscopic distribution characteristics of fluids in reservoir pores and fractures, and also affects the seepage characteristics of fluids inside pores and the adsorption capacity of pore surfaces for methane gas. In addition, wettability will also affect the capillary force of the reservoir, thereby controlling the distribution, accumulation ...

Claims

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Application Information

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IPC IPC(8): G01N5/02
CPCG01N5/02G01N5/025
Inventor 李沛张金川牛嘉亮王锡伟陈世敬
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)