Advanced Technologies and Solutions for Challenging Drilling Applications

Fig. 1—Illustration comparing scale figures of a third-generation DSC and a second-generation DSC. The double-start-thread form reduces revolutions from stab to makeup by 50%. Changes in thread taper and pitch further reduce revolutions in total from 13 to 4.

This paper provides a review of recent technology advancements and addresses practical considerations associated with drillpipe and drillstem components for extreme drilling applications. Recent developments and enhancements in these connection designs, including new higher-strength materials, advanced thread forms, and associated improvements in torsional strength and fatigue performance, are presented. The paper discusses the engineering solutions implemented to overcome the high forces, slip-crushing concerns, and material-strength and toughness considerations for these critical applications.

Third-Generation Double-Shoulder Connection

Since the introduction of the second-generation double-shoulder connection (DSC), the industry trend has continued toward deeper and longer-reach wells, which has dictated the need for drillpipe connections with enhanced mechanical and dimensional characteristics coupled with improved makeup/breakout speeds.

Consequently, a project was commissioned to design, analyze, laboratory test, and field trial the industry’s first third-generation DSC. A key objective of the project was to improve connection makeup/breakout speeds significantly. Mechanical and hydraulic gains were also dictated on the basis of the industry’s trend toward deeper and longer-reach wells.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 170566, “Advanced Technologies and Practical Solutions for Challenging Drilling Applications,” by M.J. Jellison, SPE, NOV Grant Prideco, and A. Chan, Workstrings International, prepared for the 2014 SPE Asia Pacific Drilling Technology Conference and Exhibition, Bangkok, Thailand, 25–27 August. The paper has not been peer reviewed.
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Advanced Technologies and Solutions for Challenging Drilling Applications

01 February 2015

Volume: 67 | Issue: 2

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