Abstract
Abstract Yurubcheno – Tokhomskoe oilfield is located in Eastern Siberia, Krasnoyarsk region, where the most part of oil and gas reserves are contained in Riphean high fractured carbonate reservoir. This reservoir contained a lot of secondary interstices and caverns, that are tend to enlarge due to excessive pressure exerted, that leads to loss circulation, differential sticking and associated NPT [1]. In case of conventional drilling on Yurubcheno – Tokhomskoe oilfield, such problems don't allow to reach the project depth in horizontal sections 152.5 mm (6in) – 1 000 m. The most popular method of struggling loss circulation is using loss circulation materials (LCM), which dramatically affects reservoir production properties. Furthermore, effectiveness of LCM wasn't enough, because volume of lost drilling fluid, which is oil based mud, remained too high. Managed Pressure Drilling technique was applied for resolving problems while drilling horizontal section in Yurubcheno – Tokhomskoe oilfield that allowed to reach the TD. Compare to conventionally drilled wells, using of MPD in Yurubcheno – Tokhomskoe oilfield resulted in reducing mud losses up to 3 – 5 times, reducing 152.4 mm section drilling time by 20% and increasing well production by 65 – 180%.
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