CRS
CRS
4:01 PM EDT $44.60 +1.68
CRS
CRS
4:01 PM EDT $44.60 +1.68

White Papers

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By Robert F. Buck, Ph.D. and Thomas C. Williams, P.E.

The widespread adoption of directional drilling, particularly horizontal drilling in unconventional reservoirs, has led to a period of increased oil supply. Land-based horizontal drilling, where operational efficiency is critical, now accounts for most activity, especially in the North American plays [1]. Directional drillers are pressured to drill as quickly as possible using one of several techniques, the most popular of which utilizes the positive displacement, or “mud”, motor [2]. Mud motors using conventional alloy steels for critical components are now operated at or above their design limits as drillers compete to finish wellbores in record time. Stronger, tougher materials can extend design limits to accommodate increased torque-at-bit and rates of penetration (ROP) without increasing tool size.

In response to industry demands, Carpenter Technology Corporation has introduced CarTech PremoMax® alloy (UNS K52260), a premium, re-melted, alloy steel that offers an attractive combination of high strength and toughness, excellent fatigue resistance, and good hardenability.  Strength is typically improved by 20% and toughness by 30% compared to re-melted 4330+V. CarTech PremoMax alloy has been used successfully as mandrels, driveshafts, adaptors and related mud motor components. Its use has allowed directional drillers to drill with greater confidence, extend mud motor life, and reduce total drilling cost. 

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Non-magnetic stainless steels are integral materials for modern drilling operations.  They find usage throughout bottom-hole assemblies used for directional drilling.  Their low magnetic permeability is critical for limiting drill string interference with magnetic sensing tools deployed near the drill bit.  Corrosive environments within the most active drilling basins have grown increasingly hostile.  Commonly utilized nitrogen-strengthened chrome-manganese steels have been pushed beyond their limits resulting in a dramatic reduction in tool longevity.  This has principally been caused by two trends: the expanding usage of water-based chloride brines as drilling fluids in shale formations, and increasingly sour well conditions in the Middle East.  Failures of non-magnetic stainless steels in these conditions are typically due to pitting, crevice corrosion, and stress corrosion cracking.  The drilling industry needs an economical material with low magnetic permeability that satisfies the rigorous physical demands of the near-bit environment.  Carpenter Technology proposes CarTech SCF 19 Max Alloy as a solution to this problem based on laboratory data and field experience.

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Carpenter Technology Corporation Carpenter Technology Corporation

Carpenter Technology Corporation (NYSE: CRS) is a recognized leader in high-performance specialty alloy-based materials and process solutions for critical applications in the aerospace, defense, transportation, energy, industrial, medical, and consumer electronics markets.

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