Evaluation test method for water blocking damage of tight sandstone
A technology for water lock damage and tight sandstone, which is used in water resource assessment, preparation of test samples, and analysis by nuclear magnetic resonance. , Solve the effect of poor reproducibility of experimental results and comprehensively evaluate the degree of damage
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[0047] figure 1 It is the flow chart of Example 1 of the tight sandstone water lock damage evaluation test method of the present invention, as figure 1 As shown, the method of this embodiment may include:
[0048] Step 101, preparing rock core samples, performing passivation treatment and drying on the rock core samples under high temperature conditions.
[0049] In this embodiment, core samples are obtained in the direction of initial formation fluid flow through wellbore coring. Specifically, by drilling the plunger, the core sample is obtained in the initial reservoir fluid flow direction of the formation. The diameter of the sample is generally 2.5 cm, and its length is not less than 1.5 times the diameter. When the salinity of the formation water is higher than 20000mg / L or the formation water data is unknown, the prepared core samples need to be desalted with reagents such as methanol.
[0050] In this embodiment, after the core sample is prepared, passivation treatm...
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