This paper presents the results of a theoretical study, supported with the finite element analysis, into potential loss of external integrity around a casing shoe resulting from leak-off testing (LOT) in upper marine sediments (UMS). Three types of possible failures from LOTs were considered: vertical fracture, horizontal fracture, and a channel outside cemented annulus. It is proved in the paper that vertical fracture is the most unlikely failure of the three. The other two types of failure can be distinguished by different values of propagation pressures. Although horizontal fractures are initiated at low pressure in the plastic zone around the wellbore, they cannot propagate beyond the plastic zone until wellbore pressures exceed overburden pressures. Annular channels, on the other hand, may propagate upwards at pressures lower than overburden pressure. The paper shows that these channels are initiated at pressures equal to the contact stress between cement and rock and their propagation pressures are on average 3.5-fold greater than contact stress. It is also explained how to identify the UMS with high risk of annular channeling during LOTs.
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June 1998
Technical Papers
Borehole Failure Resulting From Formation Integrity (Leak-Off) Testing in Upper Marine Sediments Offshore
A. K. Wojtanowicz
,
A. K. Wojtanowicz
Petroleum Engineering Department, Louisiana State University, 515 CEBA, Baton Rouge, LA 70803
awojtan@unix1.sncc.lsu.edu
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D. Zhou
D. Zhou
Petroleum Engineering Department, Louisiana State University, 515 CEBA, Baton Rouge, LA 70803
Search for other works by this author on:
A. K. Wojtanowicz
Petroleum Engineering Department, Louisiana State University, 515 CEBA, Baton Rouge, LA 70803
awojtan@unix1.sncc.lsu.edu
D. Zhou
Petroleum Engineering Department, Louisiana State University, 515 CEBA, Baton Rouge, LA 70803
J. Energy Resour. Technol. Jun 1998, 120(2): 111-117 (7 pages)
Published Online: June 1, 1998
Article history
Received:
October 10, 1997
Revised:
March 30, 1998
Online:
November 6, 2007
Citation
Wojtanowicz, A. K., and Zhou, D. (June 1, 1998). "Borehole Failure Resulting From Formation Integrity (Leak-Off) Testing in Upper Marine Sediments Offshore." ASME. J. Energy Resour. Technol. June 1998; 120(2): 111–117. https://doi.org/10.1115/1.2795020
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