Casing Shear Deformation Based on Micro Seismic Data

Abstract:

Casing shear deformation, which is caused by fault slipping, is the main morphology of casing deformation occurred during multistage fracturing. In order to determine the relationship between fault slipping and casing shear deformation, the micro seismic data collected from engineering field which can reflect the reality of the formations was analyzed. A new numerical model was developed, and the influential factors on casing shear deformation were studied, including the fault slip distance of lower and upper interface, fault dip angle, the thickness of cement sheath and casing. The results of research shows that: (1) Fault is easily activated by fracturing, which was the main reason of casing shear deformation; (2) The greater the fault dip angel, the slip distance, the greater the casing shear deformation; (3) Increasing the wall thickness of casing or cement sheath is beneficial to decrease the degree of the shear deformation; (4) Two ways can be used to avoid and control the casing shear deformation, one is keeping the designed horizontal segment of well trajectory keep away from fracture-developed area, or be parallel to natural fracture, the other is using stage cementing technology. Research results can provide important reference for design and control of casing integrity during multistage fracturing in shale gas wells.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 1011-1019
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.1011
• Online since: January 2019
• Authors: Yi Jin Zeng, Yan Xi*, Shi Dong Ding, Jun Li, Xin Yu Hao, Fang Yuan Li, Hai Tao Wang
• Keywords: Fault Slipping, Micro Seism Data, Multistage Fracturing, Shear Deformation

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