Society of Petroleum Engineers – Michigan Section Michigan Basin Geological Society

7:00 PM – Talk will begin
Refreshments will be provided after the talk in the Natural Science Building
No charge for this meeting

Secondary Oil Recovery Under Delta Pressured Gas Storage Operations, Columbus III Unit, St. Clair County, Michigan

by 

Jac Lentz

Plains Natural Gas Storage

Abstract: There are very few reservoirs that have produced both oil and gas under primary production and have been converted to gas storage; the Columbus III field is one of these. The Columbus III field under primary production produced 7.9 MMbo, 1.1 MMb NGL’s and 19.5 Bcfg from the A1 Carbonate/Brown Niagaran reservoir. The field was converted to gas storage in 2003-2004 utilizing nine (9) dual and single leg horizontal wells in the gas cap, and six (6) dual and single leg horizontal wells were drilled along the bottom of the original oil zone to recover oil. Subsequent to the storage conversion, three (3) vertical wells have been drilled for oil recovery, and one original Niagaran brine injection well has been re-completed to the Detroit River Group for produced brine disposal. At least three (3) static reservoir models have been built and as many or more predictive simulations have been run on the reservoir over the years for both gas deliverability and oil production forecasting. This presentation will focus on the development of oil recovery system.

Biography: Jac Lentz has worked in the gas storage industry for the past 23 years working for ANR Pipeline Co. for nearly 20 of these before accepting the Director of Reservoir Storage position with Plains Natural Gas Storage in 2009. Gas storage experience has included three (3) Michigan Niagaran reef developments, one (1) New York Devonian aged reef development, compressed air energy storage reservoir studies in California and Mississippi, and Michigan Stray sandstone horizontal well developments and storage field operations. Also, numerous bedded and diapiric salt gas storage studies on the desktop and in the field have been undertaken. Current duties include operations and development of the Columbus III unit, brine storage development in Mississippi and due diligence of potential bedded or cavern gas storage projects. Before this, Jac worked for eight (8) years in the exploration and production industry for two (2) producers and explorers in Michigan, Hunt Energy Corp. and Lomak Petroleum, as well as for geological service companies in Michigan, North Dakota, Wyoming and Utah. 

Jac holds a B.S. degree in Geology from Indiana State University and is a member of SPE, AAPG, and the Solution Mining Research Institute, (SMRI).