Completion ‐ Completion Definition
• • After a well is drilled and the hydrocarbon bearing reservoirs have been After a well is drilled and the hydrocarbon bearing reservoirs have been established, it needs to be completed to allow the hydrocarbons to flow from the reservoir to surface. Completions are the interface between the reservoir and surface Completions are the interface between the reservoir and surface production. The role of the completion designer is to take a well that has been drilled and convert it into a safe and efficient production or injection conduit. The ideal completion is the lowest cost completion (considering initial and operating cost) that meets or nearly meets the demands placed upon for most of it life. f i lif The aim of completion design is obviously to deliver optimal quantities of fluid with maximum safety and efficiency throughout the life of the well. Completion design is a mix of physics, chemistry, mathematics, C l i d i i i f h i h i h i engineering, geology, hydraulics, material science and practical hands‐on wellsite experience.
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Completion ‐ Completion Categories
• Completions are categorised in several ways, common criteria include: • Wellbore/reservoir interface
–O Open hole or cased hole h l dh l
• Production method
– Natural flowing or pumped production
• Number of producing zones Number of producing zones
– Single or multiple zone completion
Open Hole Completion Open Hole Completion
The term open hole covers a variety of completion techniques: Th t h l i t f l ti t h i • Bare foot completions – no tubulars across the reservoir face. • Pre‐drilled and pre‐slotted liners. • Open hole sand control techniques such as stand‐alone screens, open hole gravel packs and open hole expandable screens. open hole gravel packs and open hole expandable screens. • Many of the simpler multilateral systems use open hole reservoir techniques. • The Open hole...
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