Through collaborative initiatives between LLOG Exploration Co. LLC and Baker Hughes, a series of three wells in LLOG’s Who Dat field were successfully drilled and completed, including multizone well architecture integrated with intelligent well systems. Optimization of the well architecture and completion design was achieved through a comprehensive understanding of the reservoir requirements and long-term production goals of LLOG’s Who Dat field. The overall technical and operational success of the project can be attributed to a combined team using Baker Hughes’ expertise across multiple technology areas and LLOG’s operational knowledge. Together with LLOG, Baker Hughes devoted some of its most experienced engineers and technicians, with years of experience ranging from 11 to 43.
The Who Dat field’s first well, MC 547 SS01, was completed in June of 2010 and set the bar for subsequent expectations. Well MC 503 SS02 was completed in September of 2010 as an intelligent well, and MC 503 SS01 was completed in January of 2011 with three frac packs integrated with intelligent well systems. The well designs included two intelligent well systems that enabled the operator to produce from separate zones or comingle production, resulting in optimal management of reserve recovery and well performance. Despite the complexity and scope of technology, the wells were drilled and completed with industry-leading efficiency and safety performance while meeting the goals under the planned cost.
Precise wellbore placement
Baker Hughes’ drilling and evaluation team delivered precise wellbore placement and critical formation data integral to the success of LLOG’s Who Dat project by using the AutoTrak G3™ rotary steerable system. In addition, an array of logging-while-drilling (LWD) services were implemented, including Baker Hughes’ OnTrak™ measurementwhile- drilling (MWD) service, LithoTrak™ LWD porosity service, SoundTrak™ LWD acoustics service, and TesTrak™ LWD formation pressure-testing service. To further define reservoir characteristics, a post-processing technique for logging mechanical properties was used to aid in determining reservoir compressibility and its affect on recoverable reserves.
The combined portfolio of technologies and services were implemented to minimize the overall project risk. Baker Hughes’ AutoTrak G3 rotary steering system combined with real-time MWD/LWD data enabled the rotary steering system to drill complex well targets. TesTrak services were used in the first well during the drilling phase to measure formation pressures in an unknown pressure regime, as well as provide fluid gradients and reservoir fluid mobility. The real-time formation pressure testing provides data to update the geological model as well as improve wellsite safety and enhance drilling efficiency. The LithoTrak advanced LWD porosity service was used in all three wells in the 12 ¼-in. and 8 ½-in. reservoir sections. LithoTrak provides neutron porosity, bulk density and acoustic caliper measurements. In addition, the bulk density measurement can be displayed as a borehole image spanning 360°.
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