Advanced modeling, real-time model updating improve extended-reach drilling success

Click here to enlarge imageBy applying advanced predrill modeling combined with real-time model updates, ChevronTexaco Corp., San Ramon, Calif., successfully drilled three extended-reach wells to 19,000-ft horizontal displacement in the Petronius field of Gulf of Mexico's Viosca Knoll Block 786 (Fig. 1).Compared to conventional vertical wells, complications from formation pore pressure, borehole stability, hole cleaning, drillstring torque and drag, and other parameters create serious challenges for extended reach and horizontal well drilling in deep water.In most deepwater drilling environments, high formation overpressures combined with low fracture pressures place narrow limits o...

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