CHES, casing hydraulic expert system

Lloyd R. Heinze

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


An operations-oriented, practical application of expert systems technology to tubular design and optimizing bit hydraulics has been developed and is called CHES (Casing Hydraulic Expert System).1 Drilling operations are the most costly expenditure in the process of exploiting hydrocarbon fossil fuels. Drilling costs during 1981 to 1991 have each year exceeded one-third to one-half the total capital and exploration outlays for U.S. domestic projects. The reduction of drilling cost is more important than ever in the oil industry today. An important way to decrease drilling costs is to increase the penetration rate of the bit. Optimizing bit hydraulics is an important task facing drilling engineers in order to increase drilling rate. Rheology, hydraulics, and bit nozzle selection are parameters to be considered when optimizing drilling. CHES is written using an expert system shell (LEVEL-5, from Information Builders, Inc.). The backward chaining rule base interfaces with DB3 (Data Base 3), numerous FORTRAN programs, and chains from one knowledge base to another. CHES was developed and implemented on an IBM PC AT microcomputer.

Original languageEnglish
Pages (from-to)43-55
Number of pages13
JournalProceedings of the Annual Southwestern Petroleum Short Course
StatePublished - 1992
EventProceedings of the 39th Annual Meeting of the Southwestern Petroleum Short Course Conference - Lubbock, TX, USA
Duration: Apr 22 1992Apr 23 1992


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