Southwest Petroleum University

Leiyu Gao

Jianfeng Liu

Xiangchao Shi

Hao Yu

Yuming Wang

Qingling Li

Yuting Dai

Xiuping Chen

Shuanggui Li

The present disclosure discloses a method for calculating a safe drilling fluid density in a fractured formation, including the following steps: S, performing image processing to identify a downhole fracture; S, establishing three-dimensional (3D) geological models based on parameters of the downhole fracture, and establishing a drilling wellbore model based on a size and length of a wellbore; S, assigning the model with material parameters, boundary conditions, and upper and lower bounds of an initial drilling fluid density, and calculating accuracy; S, solving the 3D geological models using a 3-dimension distinct element code (3DEC) and determining stability of a well wall; S, determining upper and lower bounds of a drilling fluid density using dichotomy; S, repeating steps Sto S; and S, after set accuracy conditions are reached, saving and outputting the safe drilling fluid density.

Method for calculating safe drilling fluid density in fractured formation

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Chengdu, China

Leiyu Gao