Well Integrity Life Cycle

Gouda, Mohamed Hassan (Petronas) | Aslam, Ismail (Petronas)

OnePetro 

Abstract

Have we learned from historical major incidents in the industry?

We are working in a learning organisation equipped with structures and procedures to ensure that lessons from major incidents are incorporated as organisational changes. The following lessons were captured; apply HSE case regime; adapt process safety concept to drilling operations; create and sustain well integrity throughout the entire well life cycle and choose the right leading and lagging indicators to measure and promote continuous improvement.

The heart of these lessons learnt are to establish a process of managing the major accident hazard risks throughout well life cycle. In effect, identify hazards, define safety critical elements, develop performance standards and establish the assurance and verification process. Ultimately, the records of these steps have been demonstrated in safety case document. All steps have been monitored, tracked and audited through the Well Integrity Management System (WIMS). In execution, the conducted program was an assessment of our current situation, taking into account lessons learnt from historical major incidents, close gaps and sustain performance. The deployment was conducted through four distinct phases: Assess, Define, Intervene, and Sustain.

The outcomes of execution of the program in our wells stock are managing and preserving well integrity throughout well life cycle phases rather than operation phase only; the percentage of non-healthy wells are reduced from 25% in 2013 to 5% in 2015; all contracted rigs have verified HSE Cases; new well integrity measures are applied. Moreover, all are contained, tracked and audited in WIMS.

The application of WIMS combines technical, operational and organizational barriers to prevent the uncontrolled flow of fluids to the surrounding environments or across subsurface formations throughout well life cycle.