The incremental demand for oil and gas is driving the industry to search and produce hydrocarbons in more challenging environments. The evolution of Drilling Technologies in recent years has allowed operators to explore high viscous oil in turbidite reservoirs, at shallow burial depth and water depths greater than 1500 m. In such environment, the reservoirs are usually formed by unconsolidated sands with low fracture gradient, high porosity and permeability, and low water saturation at low temperatures.

Although great advances have been made for open-hole completion technologies, optimizing sandface completion for productivity is a big challenge. Issues for a sub-sea well construction can be: reduced drilling fluid weight window available; special well geometries to maximize reservoir drainage; non-invasive drilling and completion fluids for well productivity; mandatory sand control; effective control on water injection and production; completion reliability and intervention requirements, thermal effects due to cold waters like hydrate formation and thermal fractures for injectors.

This paper addresses the issues related to well construction in such environment and presents recent developments for well completion design such as: new approach for sand control system selection for heavy oil that excludes sand but allows fines to pass; minimization of the pressure drop through the sand control system; well segmentation to correct the oil influx profile, improving reservoir drainage, and giving selectivity and control of water production.

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