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
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[0021] 1 Preparation before sampling
[0022] 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.
[0023] 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.
[0024] 2. Sampling
[0025] 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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