Geomechanical modeling with applications, Karr Field, Alberta, Canada
Date
2011
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Abstract
Seven Generations Energy Ltd. (7GEN) holds extensive land rights in the Karr area of central/western Alberta. It is critical to the success of the company that a thorough understanding of stress orientation in its tight gas reservoirs is gained in order to drill horizontal wells in optimal direction, avoid wellbore stability issues and subsequently max1m1ze drainage through orthogonal fracture placement (i.e. - optimal wellbore direction). A vertical stress profile must be developed prior to designing an optimized hydraulic fracture treatment. The stress profile is subsequently used to determine upper and lower "boundary" conditions under which the hydraulic fracture will be theoretically constrained in height. Maximum horizontal stress orientation was determined from borehole breakouts and drilling-induced tensile fractures interpreted from image logs and four arm dipmeter logs. Minimum horizontal stress was determined based on analysis of fracture treatments in analogous offsets. The target formation also showed the presence of coal layers interspersed within the main sand member. Drilling operations frequently experienced tight hole conditions which led to rig down-time and moreover, risked the loss of the entire wellbore. A relationship between wellbore collapse, horizontal stress, apparent rock strength log (ARSL) and rock mechanical properties was developed. To the author's knowledge, this technology has not been used in industry.
Description
Bibliography: p. 49-52
A few pages are in colour.
A few pages are in colour.
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Citation
Teichrob, R. R. (2011). Geomechanical modeling with applications, Karr Field, Alberta, Canada (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/4110