The Abu Dhabi Company for Onshore Oil Operations (ADCO) requires a step change in drilling performance to meet its business objectives of increasing production capacity whilst containing technical costs.

ADCO evaluated various performance management systems enabling distinctive drilling performance. The Shell DTL* approach appeared to be the most applicable to the ADCO environment and the most likely to achieve the required objectives.

ADCO is now progressing with implementation of Well Delivery Limit (WDL), a partner of Shell's Drilling The Limit philosophy. This paper describes the WDL process and its step by step implementation plan in ADCO together with results to date.

A kick-off Drilling The Limit workshop was held in January 2000 in Abu Dhabi, organized by ADNOC for their Operating Units (OU's) with support from Shell. Thereafter, ADCO took a leading role as an ADNOC Group OU by developing a three phase implementation plan.

The first phase pilot project was launched in March, 2000 by a three day "Well Delivery Limit" (WDL) workshop.

Based on this initial work, two small multidisciplinary teams of highly motivated and professional staff were formed to implement WDL on two Rigs. The teams were made up of engineers from ADCO's Drilling and Petroleum Development Divisions, Drilling Contractor and Service Companies.

The WDL pilot ran for six months and generated spectacular results, completing some 11 wells in 45% less time than the historical average. Based on the success of the pilot project, Phase-I of the WDL implementation plan was initiated in October 2000, involving a further four rigs working in two different fields.

By June 2001, a total of 55 wells had been drilled under the WDL process in the Pilot and Phase-I stages with outstanding results. The initial success of Phase-I proved that the WDL process could be rolled out to a larger number of rigs without dilution of the results.

In view of this success, a rollout plan is presently underway to spread the well delivery process to the entire ADCO rig fleet of 12 units by mid 2001.

This phased implementation is being pursued in parallel with expanding the WDL multi-functional approach to the conceptual well design phase in order to leverage quality and well productivity improvements in addition to the cost and time savings already realized.

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