Halliburton's Drilling Performance process execution phase has two main goals
Our first goal is to execute the plan and deliver superior performance by instantly responding to actual conditions encountered and adjusting the plan accordingly. This also includes addressing "invisible non-productive time" via real time improvement of procedures and by avoiding unnecessary activities. The second goal is hazard avoidance—responding to the unexpected to prevent conditions from becoming worse and then implement contingency plans. Indeed, throughout execution, effective drilling optimization requires that all of execution objectives need to be balanced and managed so that performance targets are met or exceeded, and non-productive time events are avoided. To do so we must understand the impact that each execution element has on the system as a whole so we do not compromise overall performance.
When drilling any hole section it is important that the correct measurements are made so that the actual drilling conditions can be accurately established and any deviations from the plan identified and corrected. Planning and design always involve the acceptance of a certain level of uncertainty. But with the correct measurements and analysis, this uncertainty is reduced. Measurements of wellbore position, formation properties, drillstring energy inputs and dynamics, drilling fluid properties and pressures must be made. This information is used to make sure the wellbore is positioned correctly and positional uncertainty is reduced, the well is being drilled with a minimum of tortuosity, wellbore integrity boundaries are updated based on the conditions encountered, and wellbore static and dynamic pressures are managed by maintaining the drilling fluid properties and flow rates to prevent both a fluid influx or damage to the wellbore. The hole must be cleaned effectively to prevent stuck pipe incidents and cuttings bed build-up in high angle wells, as well as maintain static and dynamic pressures within the wellbore pressure boundaries. Drillstring torque and drag is minimized through reduced tortuosity and good hole cleaning. To ensure that the BHA can be tripped in and out and the casing run into the hole, the quality of the hole must be maintained—which also maximizes hole cleaning efficiency and reduces the possibility of the drillstring or casing becoming stuck.
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