SLIM HOLE MWD TOOL ACCURATELY MEASURES DOWNHOLE ANNULAR PRESSURE
Measurement while drilling of downhole pressure accurately determines annular pressure losses from circulation and drillstring rotation and helps monitor swab and surge pressures during tripping. In early 1993, two slim hole wells (3.4 in. and 3 in. diameter) were drilled with continuous real time electromagnetic wave transmission of downhole temperature and annular pressure. The data were obtained during all stages of the drilling operation and proved useful for operations personnel.