Drills monobore well in stack play HPWBM successfully replaces OBM without sacrificing performanceDownload PDF
OKLAHOMA, UNITED STATES
In response to the rising cost of diesel used in drilling fluids consistently increasing AFE, an operator sought an alternative type of fluid system to drive down their overall cost, while providing the same performance as oil-based mud (OBM). Before moving forward with planning several monobore wells in the STACK play located in Central Oklahoma, they needed to prove the viability of switching to water-based mud (WBM).
The STACK, derived from Sooner Trend (oil field), Anadarko (basin), and Canadian and Kingfisher (counties), is aptly named, as there are multiple stacked formations being targeted for oil and gas production. Baroid was asked to provide a high-performance drilling fluid for this challenging play that would offer better cost control than traditional diesel used in OBM, while still providing the same results as OBM offset wells. Another distinctive challenge was the innovative monobore well design, which aims to drill a single-diameter hole all the way from the surface casing to total depth.
After pre-well planning with local and regional Baroid management, the BOREMAX HPWBM system was presented to the operator as a potential solution. It had been previously used in the area on three-string wells with success, but never in a highly difficult, monobore well attempt. A customized BOREMAX HPWBM was formulated based on lab testing, as well as offset usage of the fluid system, to ensure the efficacy of its inhibitive capabilities.
Due to unforeseen rig issues, the BOREMAX system was ultimately put through stress testing not before seen. Even with the stress on the mud system, as well as the wellbore, BOREMAX HPWBM results were outstanding, contributing to the delivery of a monobore well at performance levels equal to OBM.
Notwithstanding 9 days of downtime related to the unexpected rig issues, the well was successfully drilled and cased; thus, proving the viability of this customized HPWBM solution for continued use in the operator’s monobore drilling program.
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