Core based stress measurements: A guide to their application. Topical report, July 1991--June 1993
- Sandia National Labs., Albuquerque, NM (United States)
This report is a summary and a guide to core-based stress measurements. It covers anelastic strain recovery, circumferential velocity anistropy, differential strain curve analysis, differential wave velocity analysis, petrographic examination of microcracks, overcoring of archieved core, measurements of the Kaiser effect, strength anisotropy tests, and analysis of coring-induced fractures. The report begins with a discussion of the stored energy within rocks, its release during coring, and the subsequent formation of relaxation microcracks. The interogation or monitoring of these microcracks form the basis for most of the core-based techniques (except for the coring induced fractures). Problems that can arise due to coring or fabric are also presented, Coring induced fractures are discussed in some detail, with the emphasis placed on petal (and petal-centerline) fractures and scribe-knife fractures. For each technique, a short description of the physics and the analysis procedures is given. In addition, several example applications have also been selected (where available) to illustrate pertinent effects. This report is intended to be a guide to the proper application and diagnosis of core-based stress measurement procedures.
- Research Organization:
- Gas Research Inst., Chicago, IL (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- Gas Research Inst., Chicago, IL (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10115349
- Report Number(s):
- SAND-93-2239; GRI-93/0270; ON: DE94005291; TRN: 94:001228
- Resource Relation:
- Other Information: PBD: Jun 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
Significance of drilling and coring-induced fractures in Mesaverde core, northwestern Colorado
Techniques for determining subsurface stress direction and assessing hydraulic fracture azimuth