Schlumberger

Technical Paper: Fundamentals of Mechanical Debris Management

Society: AADE
Paper Number: AADE-11-NTCE-5
Presentation Date: 2011
 

Abstract

Debris management is an important consideration when drilling, completing and producing a well. Unwanted debris can be responsible for many problems and unforeseen costs, particularly in highly deviated holes, extreme water depths, and extended reach applications. This debris is generated from a number of sources, including formation cuttings, mud solids, milling, shoe track drill outs, cementing, gun debris and ferrous residuals from casing wear. When debris is left behind in a wellbore, it can ruin a complex multi-million dollar completion and increase the risk that a well will never achieve its full potential.

This paper focuses on the mechanical aspects of debris management that impact various operations performed during drilling and completion. Each operation has its own challenges and specific characteristics that require different wellbore clean out tool configurations and procedures. These range from simple casing scraper/brush combinations to complex assemblies consisting of mills, string magnets, circulating tools and downhole validation filters, in addition to brushes and casing scrapers for multiple casing/liner geometries. While difficult to quantify in terms of cost savings and time efficiency, proper debris management is inarguably an important element of any well program.

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