标题：Effect of the hydraulic fracturing-induced slippage of regional natural fracture on casing deformation in horizontal shale gas wells: A case study on the Weiyuan block
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：570
期号：2
DOI：10.1088/1755-1315/570/2/022011
语种：English
出版社：IOP Publishing
摘要：Casing deformation problems are widespread in the shale gas field, and the dominant natural fracture reactivation and slippage are treated as the main reasons for these casing deformations. This study establishes a mechanical model and uses the field data of Weiyuan to study the fracture slippage and the casing deformation. According to rock mechanics, the dominant natural fracture can be reactivated by the fluid injected into the fracture. A higher fluid pressure in the fracture can induce a larger slippage and a higher shear stress on the casing. The fracture slippage is not uniform along the fracture. Moreover, the maximum slippage is located at the center of the reactivation zone. The in-situ stress, friction coefficient, and angle between the fracture and the maximum in-situ stress can affect the slippage. Case studies on the casing deformation of two wells in Weiyuan have shown that the calculated slippage according to the analytical model herein is in accordance with the detected data in the field. In summary, this study provides a reliable and quick method for determining the slippage of the dominant fracture reactivation based on the distance from the fracture center.
