Ahmadou Habibou

Drill pipe is a safety-critical part of the well: a parted string means a fishing job, possible loss of the […]

Multilateral wells, extended-reach drilling (ERD) and deepwater directional drilling push the same constraints further than conventional wells: torque and drag, […]

Trajectory calculation turns survey stations (measured depth, inclination, azimuth) into north, east and true vertical depth coordinates. Those coordinates decide […]

Survey tools turn downhole orientation into the inclination and azimuth that define the well path. Their accuracy decides whether the […]

A directional BHA is chosen for the section's objectives: trajectory, hole quality, weight transfer, vibration control, formation evaluation and the […]

Toolface is the angle, measured perpendicular to the tool axis, between a reference mark on the steering tool and a […]

A positive displacement motor (PDM) turns the bit using the hydraulic energy of the drilling fluid, and a bend in […]

Annular gas migration develops slowly, is often misdiagnosed, and can grow from a minor pressure anomaly into sustained casing pressure […]

A collision with an existing well can damage both wells and, if the offset well is producing, release pressure into […]

Cement evaluation answers one question: is there a continuous, competent seal behind the casing where the well design needs one? […]