An Integrated Approach for Well Design Optimization with MPD and itsImpact on Value

摘要

In high pressure high temperature(HPHT)reservoirs and exploratory wells,especially in deep water,thereis a higher degree of uncertainty,which can increase the operational costs due to non-productive time(NPT)and operational problems due to the unpredictable nature of these wells.For these challengingwells with narrow windows,Managed Pressure Drilling(MPD)techniques offer cost-effective tools toincrease the odds for achieving well and cost objectives assurance.There are significant benefits fromearly implementation of MPD in the project life cycle.These benefits include from improving operationalefficiency to risk mitigation and safety enhancement.However,there is an enormous potential that manyoperators have been missing.This is related to the incorporation of MPD as a driver in optimizing thewell design,which could greatly increase the possibilities of reaching target depth,and potentially prepareto eliminate one or more casing strings.Current well design process hinges on the ability to manageuncertainties by company or regulatory requirements,such as kick tolerance and safety factors.This workaddresses the value added from implementing MPD in early stages in the project life cycle through theanalysis of case studies.The cost savings from the impact on the well design are also discussed.This workalso presents a in depth discussion on the benefits,and enablers of this approach.Furthermore,it presentsconsiderations by taking advantage of dynamic processes facilitated with MPD.Finally,new guiding criteriato aim to constitute a systematic and integrated approach to ensure well integrity and optimize well designwhile also considering the operational implications and integral cost benefits is proposed to the industry.This paper represents the initial phase of a compressive long-term project to integrate two main componentsof well design.These are MPD adaptive well design,and statistical analysis based on variations of loadand/or strength.