Kansas Geological Survey, Open-file Report 2003-83
KGS Open File Report 2003-83
November 2002
The Devon Energy Corporation #35-1 Robert John well in SE SW sec. 35-T.29S.-R18E. (Neosho County, KS) was selected for cuttings desorption tests in association with an on- going coalbed gas research project at the Kansas Geological Survey. The samples were gathered October 15, 2002 by K. David Newell of the Kansas Geological Survey, with well site collection by John D. Taylor of Devon Energy and other Devon wellsite personnel. Samples were obtained during normal drilling of the well, with no cessation of drilling before zones of interest (i.e., coals in the Cherokee Group) were penetrated. The well was drilled using an air rotary rig operated by McPherson Drilling. This rig was equipped with dual compressors, thus cuttings reached the surface from depths of several hundred feet in a matter of seconds.
Six cuttings samples from the Cabaniss and Krebs Formations of the Cherokee Group were collected: Bevier coal at 661-662', Croweburg coal at 685-687', Weir-Pittsburg coal at 831-832', upper Rowe coal at 938-940'; lower Rowe coal at 943-946', and Riverton coal at 996-999'. These samples ranged in weight from 247 to 1219 grams.
The cuttings samples were caught in a kitchen strainer at the air stream exit at the mud pit. They were briefly rinsed in water, then placed in desorption canisters for testing. A temperature bath for the desorption canisters was on site, with temperature at approximately at 70 degrees F. The canistered samples were later that day transported to the laboratory at the Kansas Geological Survey and desorption measurements were continued. Desorption measurements were periodically made until the canisters produced no more gas upon testing for at least two successive days. All cuttings were depleted of gas within about two weeks following collection.
Kansas Geological Survey
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