CBHP, PMCD and DGD all use the closed-loop system specifically for drilling purposes and usually only when conventional methods are not applicable for technical or economic reasons.
PMCD和DGD均采用针对不同钻井目的的闭环系统，通常用于因技术或经济原因而导致常规方法不适用时的情形。
CBHP, PMCD and DGD all use the closed-loop system specifically for drilling purposes and usually only when conventional methods are not applicable for technical or economic reasons.
PMCD和DGD均采用针对不同钻井目的的闭环系统，通常用于因技术或经济原因而导致常规方法不适用时的情形。
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