As a completion accessory, a circulation valve is included to circulate fluid for well kill or kickoff.
作业完井的一个辅助工具，循环阀用于在压井或启动时循环流体。
Therefore, resistivity logs have long been used by reservoir geologists and engineers to identify rock types, describe the variations of pore fluid and determine well completion characteristics.
因此，长期以来油藏地质学家和工程师一直把电阻率测井用于识别岩石类型，描绘孔隙流体变化和确定完井特征。
Comparing with conventional completion technology, UBD completion could make fluid loss decrease to less, and avoid reservoir damage and improve oil & gas well production.
欠平衡完井技术与传统的常规完井技术相比，可以使流体滤失降低到最小程度，并能最大限度地减少储层损害及改善油气井产能。
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