Prediction of well stability using the yield zone concept

J. M. Somerville, B. G D Smart

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper presents work conducted on borehole stability of consolidated and unconsolidated sandstone formations. A simplified stress equation, developed for work in mine tunnels in soft sedimentary rocks, which has been modified for the case of petroleum reservoir rocks is presented. A method of determining failure criteria from limited unconsolidated samples is presented, and the results used to predict the extent of a failed zone in an unconsolidated formation for various mud weights.

Original languageEnglish
Title of host publicationOffshore Europe 91 - Proceedings
Number of pages10
Publication statusPublished - 1991
EventOffshore Europe 91 - Aberdeen, United Kingdom
Duration: 3 Sep 19916 Sep 1991


ConferenceOffshore Europe 91
CountryUnited Kingdom


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