Measuring and testing – Borehole or drilling – Downhole test
Patent
1992-10-05
1994-02-01
Warden, Robert J.
Measuring and testing
Borehole or drilling
Downhole test
73382R, 364422, E21B 4900
Patent
active
052823849
ABSTRACT:
An improved technique more accurately determines pore pressure of sedimentary rock penetrated by a borehole from the earth's surface. Formation overburden is directly measured at one or more locations in the borehole, and a log of formation overburden is generated using the measured overburden pressures and conventional geophysical data. A linear relationship has been determined between the logarithm of effective stress for a specific mineral and the logarithm of solidity, which allows the maximum effective stress and the compaction exponent for that mineral to be determined. This linear relationship enables the effective stress and compaction exponent for rock comprising a combination of minerals to be precisely determined at multiple borehole intervals. The effective stress and overburden calculated according to the techniques to the present invention are particularly useful to geologist and well planners in the oil and gas industry.
REFERENCES:
patent: 4805449 (1989-02-01), Das
patent: 4809545 (1989-03-01), Lyle
patent: 4833914 (1989-05-01), Rasmus
patent: 4981037 (1991-01-01), Holbrook et al.
patent: 5081612 (1992-01-01), Scott et al.
patent: 5142471 (1992-08-01), Desbrandes
patent: 5144589 (1992-09-01), Hardage
patent: 5165274 (1992-11-01), Thiercelin
Article, "Density-Depth Correlation in Po Valley Sediments" by A. Gandino and C. Zenucchini, vol. XXIX, N. 115--Sep. 1987.
Article, "Inversion of Borehole Gravimeter Data" by Jeffrey D. MacQueen, LCT Inc. Borehole Geophysics 3: Hardware and Methods.
Article, "Ways of Deciphering Compacted Sediemtns" by Brewster Baldwin Journal of Geophysical Research, vol. 69, N. 2, Jan. 15, 1964.
Article, "Estimation of Formation Pressures from Log-Derived Shale Properties", by C. E. Hottman et al., (1965).
Article, "North Sea Application of Seismic Correlative and Seismic Velocity (ITT) Techniques to Predict Pore Pressure", by Michael A. Haas, (1990).
Article, "Undisturbed Clay Samples and Undisturbed Clays", by Karl Terzaghi, (1941).
Article, "Influence of Depth, Temperature, and Geologic Age on Porosity of Quartzose Sandstone.sup.1 ", by John C. Maxwell, (1964).
Article, "Sandstone Porosity as a Function of Thermal Maturity" by James W. Schmoker et al., (1988).
Article "Compaction of Basin Sediments: Modeling Based on Time-Temperature History" by James W. Schmoker and Donald L. Guatier, (1989).
Article, "Compaction Curves.sup.1 " by Brewster Baldwin and Crispin O. Butler, (1985).
Article, "A Petrophysical-Mechanical Math Model for Real-Time Wellsite Pore Pressure/Fracture Gradient Prediction" by P. W. Holbrook et al., (1987).
Article, "Explicit Pore-Pressure Evaluation: Concept and Application" by Jean-Louis Alixant et al., (1991).
Article, "A Dual Shale Pore Pressure Detection Technique" by T. M. Bryant, (1989).
Article, "A New Method for Predicting Fracture Propagation Pressure from MWD or Wireline Log Data" by P. W. Holbrook, (1989).
Article, "An Accurate Rock Merchanics Approach to Pore Pressure/Fracture Gradient Prediction" by Phil Holbrook, (1990).
Article, "Regional Fractures II: Fracturing of Mesaverde Reservoirs in the Piceance Basin, Colorado.sup.1 " by John C. Lorenz and Sharon J. Finley, (1991).
Article, "Diagenesis of Saline Pan Halite; Comparison of Petrographic Features of Modern, Quaternary and Permaian Halites.sup.1 " by Enrique Casas and Tim K. Lowenstein, (1989).
Article, "Compressional Velocity and Porosity in Sand-Clay Mixtures" by D. Marion et al., (1992).
Article, "The Distribution of Shale in Sandstones and Its Effect Upon Porosity" by E. C. Thomas and S. J. Stieber, (1975).
Article, "Elastic-Plastic Deformation of Anhydrite and Polyhalite as Determined From Quasi-Static Triaxial Compression Tests" by Tom W. Pfiefle and Paul E. Senseny, (1981).
Article, "The Effect of Decrease in Porosity With Depthon Future Development of Oil and Gas Reserves in South Louisiana" by G. I. Atwater and E. E. Miller, (no date given).
Article, "Real-Time Pore-Pressure Evaluation from MWD/LWD Measurements and Drilling-Derived Formation Strength" by J. C. Rasmus et al., (1991).
Article, "How to Predict Formation Pressure and Fracture Gradient", The Oil and Gas Journal, (1967).
Article, "Compaction of Lithic Sands: Experimental Results and Applications" by Edward D. Pittman, (1991).
Article, "Estimating Thermal Conductivity in Sedimentary Basins Using Lithologic Data and Geophysical Well Logs.sup.1 " by Frederic Brigaud et al., (1990).
Baroid Technology Inc.
Tran Hien
Warden Robert J.
LandOfFree
Method for calculating sedimentary rock pore pressure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for calculating sedimentary rock pore pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for calculating sedimentary rock pore pressure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-573597