E. R. Crain, P. Eng.
E. R. Crain and Associates Ltd.
Calgary, Alberta
ABSTRACT
Log evaluation of multi-zone, multi-well projects is done for three basic purposes:
1. Identification of potential reserves to be drilled during exploratory projects
2. Evaluation of probable reserves, for development now or in the future
3. Evaluation of proven reserves for use in cash flow analyses, for secondary recovery studies, and for reporting to regulatory agencies
Such evaluations usually require a large expenditure in professional staff and possibly computer time, as well as a large organizational effort by supervisory staff to keep the project on-track and on-time. This paper describes the job performance of a self-contained, portable, micro-computer based log evaluation system, which minimizes the direct cost and organizational overhead needed for effective and timely results. The average performance for a typical system provides analyses for about 500 zones averaging 200 feet in length in 378 working days (18 months), for an average cost of $0.86 per foot of well-bore. A permanent database is established during the initial evaluation, which can
be reviewed or revised as prospect knowledge or economic conditions change.