World Longest 7 in Single Trip for Multizones High Rate Water Pack Enhances Completion Strategy in Offshore Indonesia

Abstract

Abstract Multizones Single Trip Gravel Pack (MZ-STGP) completion has been mainly utilized in Mahakam field in Indonesia since 2012 to present. The system has been used as a sand control solution for its cost efficiency, the ability to complete multiple pay zones in a single trip and to provide zonal isolation for production selectivity for typical unconsolidated sands, poor sorting, and uniformity coefficient as well as very high fine content. The cost escalates when this requirement happens for multiple zones that may require multi run which needs longer rig time. As of now, few of completions used to utilize the 9 5/8" system that normally require large bore and pumping more volume of fluid injected to deliver gravel pack slurry into wellbore. Meanwhile as part of drilling and completion cost efficiency, slimmer well architecture and completion system installation has driven by the needs for of a smaller borehole under various scenarios such as cases where 9 5/8" casing cannot reach planned depth and unlock additional reserves deeper below 9 5/8" casing shoe associated with well cost optimization for marginal gas wells at Mahakam. This paper reviews on successful execution of 7″ Multizones Single String Gravel Pack system deployment, high rate water pack design, lessons learnt and required mitigation on the system itself while ideal deliver gravel pack slurry have to be in place properly at downhole. Further optimization is the Multizones Single String Gravel Pack system developed to unlock more potential sandy reservoir drilled with multi zones gravel placement treatment in order to reduce the rig time and preserve smaller 7in multizones single trip system by extended top bottom assembly to 445 m and service pipe length up to 425 m as world longest 7" MZ-STGP system to achieve optimum well cost economically.