Modified failure criteria for shales
Source
The Arabian Journal for Science and Engineering. Section B, Engineering
Issue
Vol. 22, Issue 1B (30 Apr. 1997), pp.77-94, 18 p.
Publisher
King Fahd University of Petroleum and Minerals
Publication Date
1997-04-30
Country of Publication
Saudi Arabia
No. of Pages
18
Main Subjects
Natural & Life Sciences (Multidisciplinary)
Abstract EN
Most shale rocks which contain an appreciable fraction of reactive clays (e.g.
montmorillonite) will adsorb mud filtrate (water+ions) and cause unstable hole conditions.
When contacted with the mud filtrate, these shales will swell, creating a soft, swollen zone around the wellbore, therefore, the natural mechanical properties or the strength of the swollen shales will decrease causing serious hole problems such as undergauge hole, stuck pipe, overpull on trips, and several other problems.
Thus swelling stresses and rock strength reduction must be included in any attempt to effectively model shale mechanical properties after interaction with drilling fluid filtrate.
In this study shale swelling stresses were integrated into the prominent Mohr-Coulomb failure criterion and therefore a new form of this criterion has been introduced which combined the natural mechanical properties with swelling stresses to predict the in-situ strength of shales when invaded by the drilling fluid filtrate.
The modified failure criterion was verified experimentally.
American Psychological Association (APA)
al-Awwad, Musaid N. J.& Smart, B. G. D.. 1997. Modified failure criteria for shales. The Arabian Journal for Science and Engineering. Section B, Engineering،Vol. 22, no. 1B, pp.77-94.
https://search.emarefa.net/detail/BIM-389886
Modern Language Association (MLA)
al-Awwad, Musaid N. J.& Smart, B. G. D.. Modified failure criteria for shales. The Arabian Journal for Science and Engineering. Section B, Engineering Vol. 22, no. 1B (Apr. 1997), pp.77-94.
https://search.emarefa.net/detail/BIM-389886
American Medical Association (AMA)
al-Awwad, Musaid N. J.& Smart, B. G. D.. Modified failure criteria for shales. The Arabian Journal for Science and Engineering. Section B, Engineering. 1997. Vol. 22, no. 1B, pp.77-94.
https://search.emarefa.net/detail/BIM-389886
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 97
Record ID
BIM-389886