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...helps determine the amount of [[hole friction]] and the correct amount of weight to put on the bit. The drawworks also transfers power to make up and break ...y; that is, the weight of the drill string stacked in the derrick plus the weight of [http://www.glossary.oilfield.slb.com/en/Terms/c/casing.aspx casing] tha

| Mud weight, hole size, and tool position | Becomes significant as hole size and mud weight increase; charts also available for potassium, uranium, and thorium curves.

...rors by calculating mud hydrostatic pressures at different depths from mud weight; check them against measured mud hydrostatic pressures at the same depths.

...nd, a variety of sound sources have been used, including dynamite, a heavy weight repeatedly dropped on the ground, or a vibrating steel plate on the ground

...rs are porous structures that form a load-bearing framework supporting the weight of the overburden. Reservoir depletion increases the effective stress on th