abnormally pressured shallow formations as a result of upward fluid migration: 1) leaky fault; 2) leaky cement or casing; 3) improperly abandoned underground blowout
steps in well drilling do not include: to build drilling equipment
to select power system of a drilling rig, one needs to consider: weight of the drill string
is formation fracture pressure always higher than formation pore pressure: yes
causes of abnormal pore pressure do not include: drilling
when would we not use oil based drilling...