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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Grahic Jump Location
Width of plastic fracture versus radial distance
Grahic Jump Location
Volume of plastic fracture is small
Grahic Jump Location
Annular crack between cement and rock opens up due to increasing LOT pressure
Grahic Jump Location
Nonlinear behavior of annular crack
Grahic Jump Location
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
Grahic Jump Location
Typical leak-off test plot
Grahic Jump Location
LOT plot in Shallow Marine Sediment
Grahic Jump Location
Expansion of wellbore in plastic zone is controlled by outer elastic zone
Grahic Jump Location
Concept of horizontal “plastic,” non-penetrating fracture in plastic zone around wellbore



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