Measures to improve perrne- ability reduction are discussed in terms of the drilling method, fluid properties, artificial infiltration layer, and well flushing, etc.
论述了水井井周渗透性降低的原因，从钻井方法、冲洗液性能、建立人工过滤层、洗井等方面探讨了改善渗透性的措施。
It introduces the compositions and maintaining measures of the drilling fluid system, and evaluates the properties in this paper.
文中介绍了该体系的配方及维护处理措施，并对其性能进行了评价。
Analysis of mineral composition, physical and chemical properties on instable formation rock in an important work in the study of drilling fluid.
地层矿物组分、理化性能分析是整个泥浆工作中一项极为重要的基础工作。
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