Previous Talks

Wednesday, March 12th, 2008

Lessons Learned from 20+ Years of Compaction and Subsidence Monitoring - How Good is the Data and How Well Do We Use It?

Neal Nagel - ConocoPhillips, Houston, Texas


ConocoPhillips, as operator for the large Ekofisk Field and associated fields in the Norwegian sector of the southern North Sea, has performed extensive monitoring, modeling and remediation for field compaction and subsidence since the "discovery" of Ekofisk Field subsidence in 1984. This presentation will focus on the more than 20 years of monitoring data and experience covering both compaction monitoring within the compacting chalk reservoir and the overlying overburden as well as seabed subsidence monitoring via seabed pressure gauges, GPS systems and seabed bathymetry. Newer monitoring techniques, like 4D seismic, will also be reviewed.

Speaker Biography

Dr. Neal B. Nagel is currently a Principal Geomechanics Engineer with ConocoPhillips in the Wells Technology group of Drilling & Production in Houston, Texas. Nagel’s primary areas of responsibility include compaction and subsidence issues, wellbore stability, and solids injection operations for ConocoPhillips’ worldwide operations as well as instructing for internal schools (wellbore stability, hydraulic fracturing, engineering academy, etc.). Nagel joined Phillips Petroleum in 1989 and has worked in the Bartlesville, Oklahoma research center as a research engineer and the Stavanger, Norway office as the subsidence engineer prior to transferring to the Houston office. Nagel holds Ph.D., MSc, and B.S. degrees in Mining Engineering from the University of Missouri-Rolla, is currently serving as principal editor for a developing SPE monograph on solids injection, serves as a member of the SPE Drilling and Completions Committee, and was an SPE Distinguished Lecturer in 2003-2004.