With drilling, completion and production costs rising as fast as commodity prices, some operators are looking to optimize existing production with workover projects that turn marginal wells into significant producers. Historically, workovers have been delegated to perfunctory status even though 70% of today's oil production comes from fields 30 years or older1 . Some operators relegate workover projects to strictly well repair, while others take the next step and focus on how to increase production rates. New technologies and processes have provided the impetus for these operations that are reaping compelling returns for projects that not only encompass well repair but production enhancement.

In seven years, solid expandable tubulars have gone from an unconventional idea to a viable and recognized solution for wellbore construction and integrity. The appeal of these systems lies not just in the mechanism but the functionality including the ability to deepen the hole, shut off water zones and protect zones from stimulation pressures without sacrificing hole size. Maximizing inside diameter (ID) allows the operator to use the same completion previously used in the well. Operators that have planned and used expandable systems in preventive maintenance programs have realized more attractive economic and technical results than the usual one-off workover.

This paper will explain how through a planned, multi-well workover campaign, solid expandable tubulars enhance production in an affordable manner. Case histories will be used to illustrate the planning, implementation and completion stage and the tangible results of the projects. In addition, this paper will explain how these systems provide solutions for challenging downhole conditions and situations.

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