钻头被用来在水泥或岩层获取岩芯样品。
A drill bit used for obtaining core samples in concrete or rock formations.
它仅通过几块岩芯样品的孔隙度分析值，就能求准整个井的孔隙度。
The correct porosity could be ensured throughout a well just by merely setting the porosity analytic value of few core samples.
根据岩芯样品渗透率分析值和岩石水平应力，以回归分析技术研究了二者的定量关系。
Quantitative relationship between measured permeability of rock core and horizontal stress is studied by regressive analytical technique.
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