【摘 要】
：
For decades,some geological formations have been drilled with a drilling fluid that exerted a bottom-hole pressure less than the formation pressure,allowing for
【机 构】
：
Islamic Azad University,Omidieh Branch(Young Researchers Club),
论文部分内容阅读
For decades,some geological formations have been drilled with a drilling fluid that exerted a bottom-hole pressure less than the formation pressure,allowing formation fluids-oil,gas and water-to flow from the reservoir into the well bore while drilling proceeds.A growing number of Iranian case histories have shown that when UBD is applied in the right reservoir with the proper planning,well productivity can be orders of magnitude greater than with a conventional well drilled into the same formation.Wells drilled underbalanced have been proven to add additional
For decades, some geological formations have been drilled with a drilling fluid that exerted a bottom-hole pressure less than the formation pressure, allowing formation fluids-oil, gas and water-to-flow from the reservoir into the well bore while drilling proceeds. A growing number of Iranian case histories have shown that when UBD is applied in the right reservoir with the proper planning, well productivity can be orders of magnitude greater than with conventional well drilled into the same formation. Wells drilled underbalanced have been proven to add additional
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