D index is also called formation drillability index (dimensionless).
指数也称地层可钻性指数(无量钢)。
This method was applied to predict the formation drillability of Fugu1Well in Changqing Oilfield.
应用该方法对长庆油田富古1井的地层可钻性进行了预测。
The correlation between the formation drillability grade and bit type has been basically established.
按资料建立了级别-类型关系；提取了地层可钻性梯度信息。
Test shows that it's an effective model to predict the formation drillability, and its accuracy reaches as high as 90%.
通过实例验证，表明这是一种有效的确定可钻性的方法，其预测精度可以达到90 %以上。
Formation drillability is related to formation compact degree and pore fracture degree, so NDR can reflect formation pore pressure state.
地层可钻性与地层的压实程度和孔隙破裂程度有关，因此NDR可以反映地层孔隙压力的情况。
To bring forward relatively drillability conception to different drill bit style contemporary, and build they way to predict formation drillability by earthquake wave rate.
同时针对不同钻头类型提出地层相对可钻性的概念，并建立地震层速度预测地层可钻性的方法。
The result shows that the main reasons are high bottom hole temperature, corrosion of drilling tool during storage and drilling process, high value of formation drillability, and multi-fault.
结果表明，井底温度高、钻具存放及钻井过程中的腐蚀和地层可钻性级值高且断层多，是该地区钻具失效的主要原因。
The evaluation of drillability anisotropy of the formation is very important for well trajectory control.
地层可钻性各向异性的评价对井眼轨迹控制具有重要意义。
The triaxial compressive strength of rock is one of the most important formation parameters of drillability, and is the principal basis of polycrystalline diamond compact(PDC) bits selection.
岩石三轴抗压强度是表征地层抗钻性质的重要参数之一，是PDC钻头优选的基础和主要依据。
Igneous rock stratum in Daqing is the world-class difficult drilling formation. The rock drilled in the stratum have high drillability value and poor adaptability with drill bit.
大庆油田火成岩地层是世界级难钻地层，钻进过程中该地层岩石表现为可钻性值极高，地层与钻头适应性差。
Igneous rock stratum in Daqing is the world-class difficult drilling formation. The rock drilled in the stratum have high drillability value and poor adaptability with drill bit.
大庆油田火成岩地层是世界级难钻地层，钻进过程中该地层岩石表现为可钻性值极高，地层与钻头适应性差。
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