Chapter 7 Mechanical properties and stress data from laboratory analysis

Publisher Summary This chapter discusses the rock mechanical core analysis. Cores provide a possibility for direct measurement of, for example, rock strength parameters and static elastic properties. This chapter starts by looking at the rocks to be tested: the cores in the laboratory may not be fully representative of the formation one intends to study. They may also have been altered during coring and subsequent handling. The chapter also discusses the laboratory equipment and measurement techniques applied in the rock mechanical testing, including also acoustic measurements. This chapter illustrates that in some cases it may be useful to perform a set of simpler measurements, which can be used as indicators of rock strength and stiffness. This can provide information at low cost and low material consumption. If performed at the rig-site, results may be available closer to real-time. Finally, this chapter concludes by describing some of these so-called index tests.

[1]  R. Suarez-Rivera,et al.  Continuous Scratch Testing on Core Allows Effective Calibration of Log-Derived Mechanical Properties for Use in Sanding Prediction Evaluation , 2002 .

[2]  E. Fjær,et al.  Prediction of Rock Parameters from Micro-Indentation Measurements: The Effect of Sample Size , 1998 .

[3]  L. W. Teufel,et al.  A Viscoelastic Constitutive Model for Determining In-Situ Stress Magnitudes From Anelastic Strain Recovery of Core (includes associated papers 19042 and 19892 ) , 1989 .

[4]  T. L. Blanton.  The Relation Between Recovery Deformation and In-Situ Stress Magnitudes , 1983 .

[5]  Rune M. Holt,et al.  Field Application of a Novel Core-based In-Situ Stress Estimation Technique , 2002 .

[6]  N. R. Warpinski,et al.  Viscoelastic constitutive model for determining in-situ stress magnitudes from enelastic strain recovery of core , 1986 .

[7]  P. K. Leung,et al.  Dielectric Constant Measurements: A New, Rapid Method To Characterize Shale at the Wellsite , 1992 .

[8]  J. Geertsma.  Some Rock-Mechanical Aspects of Oil and Gas Well Completions , 1985 .

[9]  T. Plona,et al.  TECHNIQUE FOR MEASURING ULTRASONIC VELOCITY AND ATTENUATION SPECTRA IN ROCKS UNDER PRESSURE , 1982 .

[10]  J. P. Henry,et al.  Core discing: a review , 1990 .

[11]  A C Vlis.  ROCK CLASSIFICATION BY A SIMPLE HARDNESS TEST , 1970 .

[12]  Bernard Amadei,et al.  Rock stress and its measurement , 1997 .

[13]  Emmanuel M Detournay,et al.  The Scratch Test As A Means To Measure Strength of Sedimentary Rocks , 1998 .

[14]  Rune M. Holt,et al.  Core quality: quantification of coring-induced rock alteration , 2000 .

[15]  F. Zausa,et al.  The Scratch Test: An Attractive Technique for Determining Strength and Elastic Properties of Sedimentary Rocks , 2000 .

[16]  J. W. Spencer.  Stress relaxations at low frequencies in fluid‐saturated rocks: Attenuation and modulus dispersion , 1981 .

[17]  S. J. Gregg,et al.  Adsorption Surface Area and Porosity , 1967 .

[18]  Jean-Claude Roegiers,et al.  Can Shale Swelling Be (easily) Controlled , 1996 .

[19]  R. Risnes,et al.  Mechanical Properties of Chalk with Emphasis on Chalk-Fluid Interactions and Micromechanical Aspects , 1999 .

[20]  J. C. Jaeger,et al.  Fundamentals of rock mechanics , 1969 .

[21]  S. Saxena.  Evaluation and Prediction of Subsidence , 1979 .

[22]  Olav-Magnar Nes,et al.  Rig Site and Laboratory Use of CWT Acoustic Velocity Measurements on Cuttings , 1998 .

[23]  J. D. Waal,et al.  Prediction of Reservoir Compaction and Surface Subsidence: Field Application of a New Model , 1988 .

[24]  P. Horsrud,et al.  Mechanical and petrophysical properties of North Sea shales , 1998 .

[25]  E. T. Brown.  Rock characterization, testing & monitoring: ISRM suggested methods , 1981 .

[26]  K. Matsuki,et al.  Three-dimensional in situ stress determination by anelastic strain recovery of a rock core , 1993 .

[27]  N. Janbu,et al.  Twenty-fifth Rankine lecture: soil models in offshore engineering , 1985 .

[28]  The activity concept applied to shales: consequences for oil, tunnelling and civil engineering operations , 1997 .

[29]  Nobuo Morita,et al.  Perforation cavity stability: Comprehensive laboratory experiments and numerical analysis , 1992 .

[30]  E. Fjaer,et al.  Validity of Multiple Failure State Triaxial Tests In Sandstones , 1991 .

[31]  David J. Holcomb,et al.  Observations of the Kaiser Effect under multiaxial stress states: Implications for its use in determining in situ stress , 1993 .

[32]  Richard A. Plumb,et al.  Changes in in situ ultrasonic properties of rock on strain relaxation , 1984 .

[33]  F. J. Santarelli,et al.  Shale testing and capillary phenomena , 1994 .

[34]  F. J. Santarelli,et al.  An experimental and theoretical study of a partially saturated collapsible rock , 1997 .

[35]  J. Franklin,et al.  SUGGESTED METHODS FOR DETERMINING THE STRENGTH OF ROCK MATERIALS IN TRIAXIAL COMPRESSION: REVISED VERSION , 1983 .

[36]  Ronald P. Steiger,et al.  Quantitative determination of the mechanical properties of shales , 1992 .

[37]  John A. Hudson,et al.  SOFT, STIFF AND SERVO-CONTROLLED TESTING MACHINES: A REVIEW WITH REFERENCE TO ROCK FAILURE , 1972 .

[38]  N. Janbu,et al.  Soil models in offshore engineering , 1985 .

[39]  Rune M. Holt,et al.  CMS (constant mean stress) VS. UCS (unconfined strength) tests: A tool to reduce core damage effects , 1997 .

[40]  R. Hofmann,et al.  Fluid mobility and frequency-dependent seismic velocity — Direct measurements , 2006 .

[41]  R. Meehan,et al.  Strain rate effects in Kimmeridge bay shale , 1989 .

[42]  R. Holt,et al.  Mechanical Behaviour of Clays At High Stress Levels For Well Bore Stability Applications , 1989 .