Challenges to stress measurements in deep and/or unconsolidated rock formations for frontier rock engineering

Research output: Contribution to conferencePaper

Abstract

In these days, advanced rock and petroleum engineering tend to target deeper and/or unconsolidated oil and gas formations. Rock stress and its effect on the mechanical behavior of rock masses in such formations have drawn much attention accordingly. Taking account of such situation, we are developing new methods based upon hydraulic fracturing, which allow us to measure in-situ stress at few km deep and in unconsolidated formations respectively. In the method proposed for the deep stress measurements, the test tool is conveyed within a drill string. This way should contribute greatly to avoiding the risk of trouble occurring in boreholes such as the tool getting stuck. On the other hand, for the stress measurements in unconsolidated formations, we examined the behaviors of hydraulically-induced fractures by laboratory experiments using unconsolidated specimens made of sand and kaolin. The results show that the step rate test is effective to detect the shut-in pressure indicating normal stress across a fracture rather than the analysis of the pressure decay curve after shut-in.

Original languageEnglish
Pages19-25
Number of pages7
Publication statusPublished - 2012 Jan 1
Event7th Asian Rock Mechanics Symposium, ARMS 2012 - Seoul, Korea, Republic of
Duration: 2012 Oct 152012 Oct 19

Other

Other7th Asian Rock Mechanics Symposium, ARMS 2012
CountryKorea, Republic of
CitySeoul
Period12/10/1512/10/19

Keywords

  • BABHY
  • Deep depth
  • Hydraulic fracturing
  • Stress measurement
  • Unconsolidated sand

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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  • Cite this

    Ito, T. (2012). Challenges to stress measurements in deep and/or unconsolidated rock formations for frontier rock engineering. 19-25. Paper presented at 7th Asian Rock Mechanics Symposium, ARMS 2012, Seoul, Korea, Republic of.