This work presents a cement integrity evaluation experiment to study the failure behavior of cement sheath under cyclic loading. The CT scanning and Nuclear Magnetic Resonance (NMR) are used to investigate the fracture morphology and the changes in pore structure in terms of macroscopic and microscopic views. The results show that the stress presents a nearly linear relationship with strain in each cyclic loading period. However, there is a hysteresis loop between adjacent periods, which means that the plastic deformation occurs after each cyclic loading period. And the plastic strain increases as the number of the loading period increases. The CT scanning indicates the increase of the sample density, but no major damage is observed after the cyclic loading. There is also no major changes in pore size distribution according to the NMR results at the medium peak load. However, the pore size distribution changes significantly at the high peak load. The percentage of larger pores decreases substantially, while the smaller pores increases substantially. The purpose of this experiment is to simulate the stress state of cement sheath during staged fracturing and to provide guidance in assessing the impact of staged fracturing on cement sheath integrity.
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53rd U.S. Rock Mechanics/Geomechanics Symposium
June 23–26, 2019
New York City, New York
Effect of Cyclic Loading on Cement Sheath During Staged Fracturing
Xiaojiang Li;
Xiaojiang Li
SINOPEC Research Institute of Petroleum Engineering
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Rengguang Liu;
Rengguang Liu
SINOPEC Research Institute of Petroleum Engineering
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Shiming Zhou;
Shiming Zhou
SINOPEC Research Institute of Petroleum Engineering
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Qian Tao;
Qian Tao
SINOPEC Research Institute of Petroleum Engineering
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Peiqing Lu;
Peiqing Lu
SINOPEC Research Institute of Petroleum Engineering
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Yijin Zeng
Yijin Zeng
SINOPEC Research Institute of Petroleum Engineering
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Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, New York City, New York, June 2019.
Paper Number:
ARMA-2019-1614
Published:
June 23 2019
Citation
Li, Xiaojiang, Liu, Rengguang, Zhou, Shiming, Tao, Qian, Lu, Peiqing, and Yijin Zeng. "Effect of Cyclic Loading on Cement Sheath During Staged Fracturing." Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, New York City, New York, June 2019.
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