N (in the oil industry) drilling carried out once oil or gas has been discovered in order to assess the extent of the field, the reserves, the possible rate of production, and the properties of the oil or gas (石油行业的)评估钻井; 为了评估油田或气田的大小、储备量等
To introduce the problems existing in coal core fetch and appraisal in drilling and provide some Suggestions to solve them.
介绍了钻探岩煤芯采取及鉴定中存在的问题，并提出了解决问题的几点建议。
This paper introduces the appraisal principles and methods of engineering changes are caused by geologic changes in drilling hole pour pile.
介绍了钻孔桩地质变化引起的工程变更的估价原则和估价方法。
Making reliability appraisal for the on-site rig derrick is an important work to ensure salty in drilling.
对在用钻机井架的可靠性进行鉴定是保证钻井作业安全的一项重要工作。
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