СПОСОБ И УСТРОЙСТВО ДЛЯ ОБНАРУЖЕНИЯ НАЛИЧИЯ И ГЛУБИНЫ ВОДЫ, ДОБЫВАЕМОЙ ИЗ ПЛАСТА, ВО ВРЕМЯ БУРЕНИЯ ПРИ ПОНИЖЕННОМ ГИДРОСТАТИЧЕСКОМ ДАВЛЕНИИ В СТВОЛЕ СКВАЖИНЫ

摘要

The invention relates to methods and apparatus for determining a downhole parameter in an underbalanced drilling environment which include: selectively activating a first fluid flowing from the formation through a wellbore while under balanced drilled; detecting the activated first fluid, and determining a depth at which said fluid enters the wellbore.