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Prediction of casing critical buckling during shale gas hydraulic fracturing.

Mohammed, Auwalu I.; Oyeneyin, Babs; Bartlett, Mark; Njuguna, James

Authors

Auwalu I. Mohammed

Babs Oyeneyin



Abstract

Casing deformation during volume fracturing in shale gas horizontal wells is caused by both existing and induced stresses. These stresses jointly alter and compound the stress field around the casing leading to inefficient well stimulation as planned, lack of access into the well for recompletion, future workovers and present imminent danger of well integrity. Using two simulation scenarios, casing structural integrity was investigated in both radial and axial configurations under the mechanics of a combine system - casing, cement and formation rock. Results obtained show that time dependent rock slippage - creep during stimulation lead to an increase transverse displacement and corresponding stresses on the casing. In addition, the effect of combined loading results in significant increase in both displacements and stresses that can cause radial and axial permanent failure of the casing. This explains the lack of access into the casing during multi-stage hydraulic fracturing and future well intervention and recompletions and increased current understating of the downhole dynamics and casing structural integrity during volume fracturing. This new understanding is a major breakthrough in establishing casing health status during shale gas well stimulation.

Journal Article Type Article
Publication Date Feb 29, 2020
Journal Journal of petroleum science and engineering
Print ISSN 0920-4105
Electronic ISSN 1873-4715
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 185
Article Number 106655
Institution Citation MOHAMMED, A.I., OYENEYIN, B., BARTLETT, M. and NJUGUNA, J. 2020. Prediction of casing critical buckling during shale gas hydraulic fracturing. Journal of petroleum science and engineering [online], 185, article ID 106655. Available from: https://doi.org/10.1016/j.petrol.2019.106655
DOI https://doi.org/10.1016/j.petrol.2019.106655
Keywords Casing buckling; Rock slippage; Fracturing; In-situ stresses; Shale gas wells
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