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TECHNICAL PAPERS

Analysis of Leak-off Tests in Shallow Marine Sediments

[+] Author and Article Information
Desheng Zhou

IHS Energy Group, 18333 Preston Road, #300, Dallas, TX 75252e-mail: Desheng.Zhou@ihsenergy.com

Andrew K. Wojtanowicz

Louisiana State University, Craft and Hawkins Department of Petroleum Engineering, 3516 CEBA, Baton Rouge, LA 70803e-mail: awojtan@lsu.edu

J. Energy Resour. Technol 124(4), 231-238 (Nov 20, 2002) (8 pages) doi:10.1115/1.1506322 History: Received June 01, 2000; Revised July 01, 2002; Online November 20, 2002
Copyright © 2002 by ASME
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References

Wojtanowicz, A. K., and D. Zhou, 1998, “Borehole Failure Resulting From Formation Integrity (Leak-Off) Testing in Upper Marine Sediments Offshore,” Journal of Energy Resources Technology, June, Vol. 120, pp. 111–117.
Morita, N. M., 1991, “Safety of Casing Shoe Test and Casing Shoe Integrity After Testing,” Presented at the 66th Annual Technical Conference and Exhibition of the SPE, Dallas, TX, SPE 22557, pp. 229–243.
Postler, D. P., 1997, “Pressure Integrity Test Interpretation,” presented at the SPE/IADC Drilling Conference, Amsterdam, Netherlands, March, SPE/IADC 37589, pp. 169–183.
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Almeida, M. A., 1986, “Computer-Aided Analysis of Formation Pressure Integrity Tests used in Oil Well Drilling,” Ph.D. Dissertation, Louisiana State University.
Chenevert, M. E., and McClure, L. J., 1978, “How to run casing and open-hole pressure tests,” Oil & Gas Journal, March, pp. 67–76.
Bourgoyne, A. T., et al., 1991, Applied Drilling Engineering, SPE Text Book Series, Vol. 2, Second Printing.
Altun, G., et al., 1999, “New Model to Analyze Nonlinear Leak-Off Test Behavior,” Journal of Energy Resources Technology, Vol. 121, pp. 102–108.
Risnes, R., et al., 1982, “Sand Stresses Around a Wellbore,” SPEJ, Dec., pp. 883–898.
Chen, W. F., and Han, D. J., 1988, Plastic for Structural Engineers, Springer-Verlag New York, Inc.
Obert, L., and Duvall, W. I., 1967, Rock Mechanics and the Design of Structures in Rock, John Wiley & Sons.
Gidley, J. L., et al., 1989, Recent Advances in Hydraulic Fracturing, SPE Monograph Vol. 12, Richardson, Texas.
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Zhou, D., and Wojtanowicz, A. K., 1999, “Estimation of Leak-off Pressure Gradient from Cementing and Casing Data,” presented at the 1999 SPE Annual Technical Conference and Exhibition, Houston, Texas, SPE 56760.

Figures

Grahic Jump Location
Typical leak-off test plot
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LOT plot in Shallow Marine Sediment
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Expansion of wellbore in plastic zone is controlled by outer elastic zone
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Concept of horizontal “plastic,” non-penetrating fracture in plastic zone around wellbore
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Width of plastic fracture versus radial distance
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Volume of plastic fracture is small
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Annular crack between cement and rock opens up due to increasing LOT pressure
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Nonlinear behavior of annular crack
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Shallow pressure build-up patterns (ordinate=pressure; abscissa=volume) (a) continuous linear or curvilinear; (b) linear with curve departure; (c) curvilinear with stabilization; (d) linear sections with slope changes

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