Eubank Field, Kansas: a formation evaluation and secondary recovery project

Abstract

The Basal Chester sand, an oil reservoir pertaining to the last stage of the Mississippian, is located some 3,000 ft below the Permian reservoir of the Hugoton Gas Field (Kansas). Anadarko Petroleum Corporation (Anadarko) has acquired significant acreage in Haskell County (Kansas), a part of the Eubank Field. The Basal Chester sand in the Eubank Field as deposited in a paleovalley system that was incised in the Sainte Genevieve and Saint Louis limestones. Anadarko plans to develop a secondary recovery project in the Eubank Field, and this thesis was proposed to evaluate the Chester in terms of reservoir and fluids properties. The purpose of this thesis is to provide recommendations to implement a waterflood project at Eubank Field. All of the wells in this field have well logs, five wells were cored, and a 26 square-mile, 3-D seismic survey was performed in 1995. I have summarized all of the data available to date-well logs, production data, core data, PVT data, pressure transient tests, wellborn sketches-and organized these data into an electronic database. My focus in this work is twofold: well log interpretation and analysis of the oil production data-flow rates mostly, since very few pressure data are available. The log analysis follows Holditch's guidelines and Schlumberger's textbooks. I also present a well log-derived permeability profile for most welts, where this permeability profile is used to guide the development of my overall reservoir description. To perform production data analysis, I use the decline type curve analysis method. This approach allows a quick estimate at current conditions of the oil-in-place, drainage area, as well as the permeability of the formation and requires formation and fluid properties as input. I have evaluated all existing data for 43 production wells.