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Research Papers: Petroleum Engineering

An Analytical Solution for Microannulus Cracks Developed Around a Wellbore

[+] Author and Article Information
Arash Dahi Taleghani

Craft and Hawkins Department of
Petroleum Engineering,
Louisiana State University,
Baton Rouge, LA 70808
e-mail: a_dahi@lsu.edu

Denis Klimenko

Craft and Hawkins Department of
Petroleum Engineering,
Louisiana State University
Baton Rouge, LA 70808

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 15, 2015; final manuscript received May 5, 2015; published online June 2, 2015. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 137(6), 062901 (Nov 01, 2015) (8 pages) Paper No: JERT-15-1018; doi: 10.1115/1.4030627 History: Received January 15, 2015; Revised May 05, 2015; Online June 02, 2015

In situations like blowout or hydraulic fracturing, excessive fluid pressure may cause leaking in the casing in shallower parts of the formation. The resulting high pressure may form a cylindrical crack around the wellbore. An analytical solution for stress distribution and displacement along a cylindrical crack formed between the casing and the formation is provided in this paper. The crack is assumed to be opened by uniform fluid pressure exerted on both sides of the crack. This solution has a wide range of applications from failure analysis of fibers in manufacturing composite materials to wellbore integrity in petroleum and subsurface engineering problems.

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Figures

Grahic Jump Location
Fig. 1

A schematic picture of fluid migration outside the casing is shown in the right picture. Left pictures show different mechanisms for failure initiation in small scale: (a) radial cracking, (b) debonding or delamination crack between cement and casing, (c) delamination crack between casing and cement, and (d) channelization inside cement is marked in thick lines.

Grahic Jump Location
Fig. 2

The cylindrical crack is located at distance R from the tube centerline with the length equal to 2a

Grahic Jump Location
Fig. 3

Radial (a) and vertical (b) displacements calculated using the provided solution are compared with finite element solutions shown by dots

Grahic Jump Location
Fig. 4

Radial and vertical displacements for two cylindrical cracks (short and long) are demonstrated

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