Methanol, Fischer-Tropsch liquids and fuels derived from them can be made from natural gas or from hydrogen and captured CO2. […]
Ultra-deepwater, high-pressure high-temperature (HPHT) and extended-reach wells push the drillstring harder than conventional wells: higher hook loads and torques, higher […]
Drillstring vibration is usually described in three coupled modes: axial (bit bounce), torsional (stick-slip) and lateral (whirl). Each has different […]
Dogleg severity (DLS) is the change in wellbore direction per unit of measured depth, combining the changes in inclination and […]
Very deep wells raise the hook load, torque, temperature and consequence of a string failure. The design checks are the […]
A shock sub adds designed axial compliance and damping to a drillstring to reduce axial vibration and impact loads, protecting […]
A drilling jar releases stored energy to deliver an axial impact to a stuck drillstring. It is one tool for […]
Non-standard BHA components (roller reamers, non-rotating stabilizers, adjustable stabilizers and underreamers) solve specific problems that a conventional assembly cannot: excessive […]
A bottom-hole assembly (BHA) is a mechanical system: bit, collars, stabilizers and tools together determine weight transfer, side force at […]
The bottom hole assembly (BHA) is chosen for each hole section to deliver the planned trajectory, transmit weight to the […]
