Utilization of mud weights in excess of the least principal stress in extreme drilling environments

T. Ito, M. D. Zoback, P. Peska

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

4 Citations (Scopus)

Abstract

We address the theoretical possibility of drilling with mud weights in excess of the least principal stress for cases of particularly severe wellbore instability. Tensile fractures initiate at the wellbore wall at Pfrac, they link up to form large axial fractures sub-parallel to the wellbore axis at Plink, and they propagate away from the wellbore at Pgrow. In general, our modeling shows that Pfrac and Plink can be maximized by drilling the wellbore in an optimally stable orientation, and Pgrow can be maximized by using "non-invading" drilling muds, that is, those that prevent fluid pressure from reaching the fracture tip (i.e., if solids in the mud form bridges within the fracture).

Original languageEnglish
Title of host publicationVail Rocks 1999 - 37th U.S. Symposium on Rock Mechanics (USRMS)
Editors Kranz, Smeallie, Scott, Amadei
PublisherAmerican Rock Mechanics Association (ARMA)
Pages253-259
Number of pages7
ISBN (Print)9058090523, 9789058090522
Publication statusPublished - 1999
Event37th U.S. Symposium on Rock Mechanics, Vail Rocks 1999 - Vail, United States
Duration: 1999 Jun 71999 Jun 9

Publication series

NameVail Rocks 1999 - 37th U.S. Symposium on Rock Mechanics (USRMS)

Conference

Conference37th U.S. Symposium on Rock Mechanics, Vail Rocks 1999
Country/TerritoryUnited States
CityVail
Period99/6/799/6/9

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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