METHOD AND DEVICE FOR DETECTING THE AVAILABILITY AND DEPTH OF WATER PRODUCED FROM THE FORM DURING DRILLING AT LOWER HYDROSTATIC PRESSURE IN THE WELL

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.