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13-11 Drilling & Testing

13-11 Drilling & Testing - Rock Rock and Drilling...

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Rock Rock and Drilling Mud Reactions Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 51
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Action of Drilling Mud Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 51 Drilling mud: - Prevents ‘blow-outs” by coating the hole with “mud filtrate” - Blocks off permeability to area around the drill hole. - Determine amount of mud filtrate coating hole by reading caliper log : Hole diameter = smaller
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Casing Design Surface casing = Attached to blow-out preventers Protect ground water Intermediate casing = Protect zones where may ‘lose returns’ Zones that are either underpressured or overpressured w.r.t. target zones Production casing Pay zones (cement casing to perforate & treat reservoir) Zones that may have uphole pay potential Laudon, Robert C., 1996, Petroleum Development Geology, Prentice Hall, p. 86
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Hydraulic Pressure Typically the formation pressure gradient increases slightly with depth Principal blowout preventer = Hydrostatic head of drilling mud in well P wb = P s + (TVD • G m ) P wb = hydraulic pressure from mud in well bore P s = Surface (atmospheric) pressure = about 15 psi TVD = True vertical depth of well from drilling floor G m = Mud weight gradient
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Hydraulic Pressure Calculation
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