Analysis method for porosity degree and permeability rate of high smectite sandstone

A technology of smectite and permeability, which is applied in the field of analysis of porosity and permeability of high clay minerals and high smectites, and can solve problems such as shortcomings in the preparation of core analysis

Active Publication Date: 2009-05-13
PETROCHINA CO LTD
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Problems solved by technology

[0003] The disadvantage of this analysis method is that there are shortcomings in the preparation of core analysis before measuring porosity and permeability.

Method used

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Effect test

Embodiment 1-5

[0020] 1 Preparation before sampling

[0021] Take the oil-free high smectite sandstone sample, according to the core description, first judge that the sample is oil-free high smectite sandstone, the purpose is not to wash the oil.

[0022] For the oil-bearing rock samples routinely measured for porosity and permeability, the oil must be washed before the measurement, and the washed oil must be heated. For high smectite sandstone, heating will dehydrate. Man-made damage to the mineral structure. The measured data will have artifacts. In order not to wash oil, not to heat, not to destroy the structure of high smectite clay minerals, to reflect the real data in the formation. Oil-free samples must be selected.

[0023] 2. Sampling

[0024] When drilling high smectite rock samples, drill and cut with saturated brine. Saturated brine can inhibit the swelling and dispersion of clay minerals when meeting water. The surface is not easy to be immersed in water, the inside is dr...

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Abstract

The invention relates to a method for analyzing the porosity and the penetrance of high smectite sandstone. Sandstone without oil is selected. A sample is drilled by saturated brine. The oil is washed from the sample by toluene. The sample is cooled and is dried and vacuumized for 48 hours under normal temperature in the vacuum of minus 0.08MPa. The porosity and the penetrance are mensurated by a method for mensurating the rock porosity and the gas penetrance in PRC petroleum and natural gas industry standard SY/T 5336-1996 rock core analyzing method, and the used sample is warmed and cleaned the oil for measuring the porosity and the penetrance by the conventional PRC petroleum and natural gas industry standard SY/T 5336-1996 rock core analyzing method. Correction coefficients of the porosity and the penetrance are obtained respectively. The correction coefficients are used for correcting a same well or a same block for measuring the porosity and the penetrance data by a conventional warming and oil-washing method, so as to reflect the porosity and the penetrance data in the stratum factually.

Description

Technical field: [0001] The invention relates to a method for analyzing the porosity and permeability of high clay mineral high smectite class. Background technique: [0002] At present, the rock porosity and permeability analysis methods adopted in China are based on the determination of rock porosity and the measurement method of gas permeability in the petroleum and natural gas industry standard SY / T 5336-1996 core routine analysis method of the People's Republic of China. It is to analyze and measure all rock cores according to the standard. [0003] The disadvantage of this analysis method is that there are disadvantages in the preparation of core analysis before measuring porosity and permeability. All samples must be washed with warm oil and dried. And for clay mineral samples like smectite, which swells with water and shrinks when heated, the interlayer water begins to dehydrate when the temperature reaches 70°C. The pore structure is artificially destroyed. If t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N1/28
Inventor 张丽霞李民李培俊王国先丁风领
Owner PETROCHINA CO LTD
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