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本文阐述了水平井钻井过程中油层损害的特点，介绍了运用室内流动实验对损害的评价方法，并提出了用于水平井钻井的钻井液选择原则。
This paper describes the characteristics of oil layer damage during horizontal well drilling, introduces the evaluation method of damage using indoor flow experiment, and puts forward the selection principle of drilling fluid for horizontal well drilling.