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April 11, 2011
New fiber system helps reduce nonproductive drilling time

The new Losseal family of reinforced composite mat pills helps reduce nonproductive time by mitigating the risk of lost circulation during drilling and cementing operations.

The system, which combines fibers and solids into specifically engineered pills, is a flexible fiber additive that uses synergy between physical characteristics of fibers and solids to bridge fractures that can lead to either partial or total losses while drilling. An impermeable grid is created by the system, which is strong enough to withstand additional pressure from mud density increases, in addition to any other pressure from future drilling or cementing operations. The company says its system also addresses large losses in fissures, saving mud during placement.

Losseal can be applied to applications including circulation losses while drilling, including those greater than 40 bbl/hr. The system can also be used with natural fractures, in dolomite and carbonate zones, and in spacers ahead of cement slurries.

Source: Schlumberger Ltd., 5599 San Felipe, 17th Floor, Houston, TX 77056.

New drill-through reaming system

A new drill-through tool helps ensure casing to target depth, allowing wells to be drilled as planned and enhancing integrity.

After reaming casing to target depth, the new Turbocaser Express has a patented internal design that can be drilled through in minutes with standard drillbits after normal cementing.

The maker notes that drillers face an ever-increasing demand to run casing to greater depths and at higher angles. The firm says tools that enable drilling teams to land downhole assemblies at target depth first time can decrease drilling costs. Often, conventional methods are also not practical or prudent; for example, the size or length of the casing can make it impossible to rotate on smaller rigs, and the well path may prevent rotation in any event.

Manufactured as a single body from high-strength steel, the Turbocaser Express is a rugged and reliable downhole tool that can ream casings through obstructions, is fully high pressure/high temperature compliant, and works with any drilling fluid without deterioration in power output, reliability, or performance, the company points out.

Source: Deep Casing Tools, Unit 2, 51 York St., AB11 5DP, Aberdeen, UK.

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