ABSTRACT
Dulang is one of the aging fields in Peninsular Malaysia that started its first oil production in March 1991. After 10 years in operations, the field started to show a rapid declination in production. Since then, a lot of Production Enhancement & Idle Well reactivation activities have been conducted despite the presence of high CO2 that post challenges for well intervention jobs. The number of activities keeps increasing over the years in hope to boost production and with a time constraint, each job is planned with a very limited window for execution. The engineers constantly have to find more efficient ways to ensure all these planned activities are completed on time despite these challenges.
One of the Idle Well reactivation that was successfully conducted at Dulang is at Well A-40ST1. The well was 100% watered out from the lowest zone J-36 and uncertain production from the upper zone J-32. Based on the survey data, there is a potential reserve at a new zone that has been identified in above the current zones, namely upper J-32. Amongst the challenges in this well is the interval of each zone is so close and it is located at the highest slope of the well at 74°.
Conventional method to execute such job normally takes 2 months which involved Electric-line and Coiled Tubing packages alternately. The other option is to use electric-coil tubing which can save operation time but with higher cost. Ultimately, field operator has taken fresh new application that can provide more benefits in term of time, cost and deckspace layout.
This paper will describe the details of the complexity of the operation which involves milling, water shut-off, cementing, and perforation at remote platform location. Prior to that, detail evaluation is performed to weigh the pros and cons of conventional method and real-time fiber optic application.
