Bob Carpenter

Well Construction

The number and economic contribution of unconventional (tight gas/shale and steamflood) wells continued to increase rapidly in 2011, as did the participation of major operators. That increased industry focus was evident again in the distribution of papers. Also, there were more papers relating advances in plug-and-abandonment, Arctic, high-pressure/high-temperature (HP/HT), and carbon-capture technologies.

Manny Gonzalez, Chevron Energy Technology Company’s Alliance Manager, noted that the huge interest in shale-formation completions calls for efficient controlled fracturing technology to ensure economic viability and an environmentally responsible well completion. SPE 152185 outlines a direct comparison of openhole vs. cased-hole fracturing in a tight gas reservoir. The presented results are surprising, and the effects on incremental production, fracture height, and fracture half-length are significant—a good read.

Operators have been plugging nonproductive and storm-damaged wells at an increasing rate, and effective abandonment operations can prove costly and challenging. SPE 148640 relates a novel and well-detailed approach to a more efficient plug-and-abandon process and to the process of confirming plug integrity across an uncemented section of annulus. Check it out.

Industry emphasis on long-term well reliability has continued to increase, especially for steamflood projects. SPE 150022 details a very thorough look into the many design and operational factors that affect well reliability in a high-temperature (285°C) steamflood. While only briefly mentioned, the authors undertook controlling the rate of temperature change, and thus controlling temperature disparity (∆T) between casing, cement sheath, and formation during injection cycles. Controlling injection events can have a strong effect on the reliability of a steamflood well or even a deepwater or HP/HT well. This is the first field effort at controlling such events that I recall.

Read the paper synopses in the May 2012 issue of JPT.

Bob Carpenter, SPE, Research Consultant with Chevron Exploration and Technology Company’s Cement Team, has 33 years’ experience in field operations, technical support, and R&D. Previously, he was with Arco Exploration and Production Technology and BJ Services’ Technology Center. Carpenter serves on the SPE Drilling and Completions Advisory Committee, along with other industry groups. He has authored or coauthored 15 SPE papers and several JPT articles and has been granted 23 US patents. Carpenter’s areas of expertise include technical support and R&D of all areas of primary and remedial cementing. He also has extensive expertise in coiled-tubing cementing, spacer-fluid development, and remediation of sustained casing pressure. Carpenter serves on the JPT Editorial Committee.

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