A Laboratory Study of Two Straddle-Packer Systems Under Simulated Hydrofrac Stress-Measurement Conditions

[+] Author and Article Information
K. Evans

Lamont-Doherty Geological Observatory of Columbia University, Palisades, N.Y. 10964

J. Energy Resour. Technol 109(4), 180-190 (Dec 01, 1987) (11 pages) doi:10.1115/1.3231345 History: Received April 21, 1987; Revised July 31, 1987; Online October 22, 2009


The mechanical behavior of two straddle-packer systems subjected to pressure histories which replicated hydrofracture stress-measurement procedures has been investigated. The systems were pressurized in borehole simulators consisting of lengths of steel casing instrumented with strain gages. From the strain histories, the stresses applied to the casing by the packer elements could be calculated. The systems studied differed in the manner in which the packer elements were coupled; in one system the packers were rigidly coupled end-to-end (rigid coupling), whereas in the other, the tops of the two packers were rigidly coupled leaving the bottom of the upper packer free to slide on the mandrel (sliding coupling). The elements that featured in the two systems were also greatly different. The results indicate that the sliding coupling system tested exhibited nearly ideal behavior up to the maximum interval pressure attained in the tests of 25 MPa. This is accredited to intrinsic superiority of the sliding coupling design.

Copyright © 1987 by ASME
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