STRATEGIC PLANNING FOR BANYU URIP DEVELOPMENT DRILLING PROGRAM LED TO PACESETTER PERFORMANCE, IMPROVED BOREHOLE QUALITY AND SIGNIFICANT COST SAVINGS

摘要

This paper discusses the strategic planning andrnoptimization efforts of the development drillingrnprogram for the onshore Banyu Urip field in EastrnJava, Indonesia. The Banyu Urip Full FieldrnDevelopment Program consists of up to 49 wells onrnthree wellpads with two concurrent rig operations.rnEach well has five hole sections: 24-inch, 17-1/2-rninch, 12-1/4-inch, 8-1/2-inch, and 6-1/8-inch.rnDownhole challenges include drilling throughrnreactive shale, pad drilling with anti-collisionrnconcerns, abnormal-to-normal pore pressurernreversal, high temperature gradient, sour conditions,rnand massive drilling fluid losses into Oligo-rnMiocene Carbonate reservoir intervals withrnsolution-enhanced fractures or cave collapsernbreccia. Challenges are further amplified by thernplanned full field production start-up occurringrnduring the drilling program requiring sufficientrnnumber of wells to feed the Central ProcessingrnFacilities (CPF) at start-up. This creates a Drillingrn– Production simultaneous operations (SIMOPS)rnevent that must be thoroughly coordinated to ensurerna safe start-up.rnThe optimization process began well before thernspud of the first well, with efforts to identify andrnmature robust solutions to enhance performance atrnan early stage of the project. As such, lessonsrnlearned and improvements against key performancernindicators are assessed continuously andrnoptimizations applied to subsequent wells.rnOptimizations implemented include rig design,rnwellpad design, batch drilling, and completion inrnlieu of sequential methods. Optimizations arernmanaged through utilization of the ExxonMobilrn“Limiter Redesign Process”. This processrncomprises two main workflows; Fast Drill BoreholernManagement (FDBM) and Flat Time Reductionrn(FTR). Each workflow is focused on identifying and eliminating technical and operational limitsrnduring drilling and completions. The combinedrnstrategic planning and optimization effort have ledrnto overall savings of approximately 40% in daysrnand 30% in cost after only 8 months of drillingrnoperations in 2013.