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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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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