METHOD FOR OPERATING FORMATION MEASURING INSTRUMENT USING SEA FLOOR DRILLING APPARATUS

摘要

A method for drilling and testing formations below the bottom of a body of water includes disposing a drilling system on the bottom of the body of water. The formations are drilled by rotating a drill rod having a latch therein and advancing the drill rod longitudinally. At a selected longitudinal position, an upper end of the drill rod is opened and a cable having a measuring instrument at an end thereof are lowered into the drill rod. The drill rod is lifted to engage the measuring instrument with the latch in the drill rod. The instrument when latched extends beyond a longitudinal end of the drill rod when the latch is engaged.