Rotary drilling, LWD, MWD mean efficient drilling

摘要

FIELD TESTS IN the Austin Chalk showed that the surface system increased sliding rates of penetration from 60-200 percent, for estimated savings of 11-23 percent of total well costs. Hardware and software components in the new system integrate surface and MWD data to provide the following benefits in the sliding mode: Improved ROP and horizontal reach capability through automatic rocking, using torque as an input; Improved tool-face correction through a torque pulse method, using the drill-string; Improved well trajectory through a step-change in tool-face correction while on bottom; Improved motor life since stalling is practically eliminated; Elimination of orientation time losses through a semi-automatic transition from rotating to sliding.