... Carthage marble at 180 ft/hour, Indiana limestone at 280 ft/hour and Berea sandstone at 300 ft/hour. These tests showed that a full-scale hydraulic jet drill [3,000 hp] should drill 8-in.-diameter holes in average-strength sedimentary rocks at rates of 200 to 300 ft/ hour, These high drilling rates show...

... Reservoir Surveillance drilling operation production monitoring drilling fluids and materials production control production logging drilling rate drillstem/well testing calculation McCray Martin particle diameter Upstream Oil & Gas mass flow rate drill collar density air...

... drilling fluids and materials pore pressure Reservoir Characterization Upstream Oil & Gas pressure differential differential crater reservoir geomechanics strength resistance hold-down force drilling fluid management & disposal drilling rate drilling economics low strength...

... advantage in both drilling rate and information. Drilling rate as a function of rock behavior is fast becoming an important exploration tool. Jorden and Shirley of Shell Oil Co. have described the effects of the reduction of wellbore to formation differential pressure when entering overpressured zones...

... fracture, or some other type of component failure. It is not possible in general to optimize all performance criteria simultaneously. For example, one could achieve fantastically large drilling rates at the expense of bit or steel life, energy requirements and physical size of system. It therefore becomes...

..., AIME The Pennsylvania State University and Robert J. Goodwin, Member, AIME Gulf Research & Development Company ABSTRACT A microbit apparatus has been used to study how and why field drilling rates are usually higher when air is circulated rather than liquids. Our laboratory results with air...