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研究了采油工程入井液 p H值改变对储层的伤害机理。通过试验对比 ,分析了 p H值升高可能对储层造成伤害的主次因素 ,认为 p H值在大于 1 2的情况下 ,才能使岩石润湿性发生改变 ;而碱敏现象一般在p H值低于 1 2时就可能发生。因此 ,合理的 p H值应主要依据酸敏和碱敏试验确定。
The damage mechanism of p H value of reservoir drilling fluid on the reservoir was studied. The primary and secondary factors that may cause damage to the reservoir due to the increase of p H value are analyzed through experimental comparison. It is considered that the rock wettability can be changed only when the value of p H is greater than 1 2; H-values below 12 can occur. Therefore, a reasonable p H value should be based mainly on acid sensitivity and alkali sensitivity test to determine.