Completions

Quadlateral Success Story in a Heavy-Oil Reservoir

This paper documents the success story of the first quadlateral completion for an Alaskan operator by use of stacked, rotatable, Technical Advancement for Multilaterals Level-3 junction systems.

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This paper documents the success story of the first quadlateral completion for an Alaskan operator by use of stacked, rotatable, Technical Advancement for Multilaterals Level-3 junction systems. This well is also the first in the world in which the junction system is stacked more than twice in a single well. This quadlateral completion design is the product of targeting multiple formation layers from a single wellbore by use of openhole horizontals with slotted liners. The rotatable, multilateral junction system accommodates the increased number of laterals necessary for continued economic exploitation of the West Sak heavy oil reservoir.

Introduction

The West Sak in the Kuparuk River Unit Drillsite 1D area is a 300-ft-thick Upper Cretaceous shallow marine sequence comprising very-fine-grained single and amalgamated hummocky cross-stratified sandstone beds.

The initial 1997 West Sak development drilling in this area consisted of all vertical producers.

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