Multi-fracture Propagation Law of Horizontal Wells under Stress Shadow Effect

Kangxing Dong, Suling Wang, Jinbo Li

Ekoloji, 2019, Issue 107, Pages: 789-796, Article No: e107093

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Abstract

In order to explore the law of multi-fracture propagation in cluster fracturing of horizontal wells, considering the stress shadows between fractures, a similarity numerical model for full three-dimensional fluid-solid coupling hydraulic fracturing was established, and the extended finite element method was used to solve the problem. The effects of rock mechanics properties, fracture interval and construction parameters on fracture propagation law were analyzed by the control variable method. The results show that with the increase of elastic modulus, the width of fractures on both sides and intermediate fractures decreases, while the length of multi-fractures increases. With the increase of displacement, the width of fractures on both sides increases first and then decreases, the width of intermediate fractures decreases first and then increases, the length of fractures on both sides increases gradually, and the length of intermediate fractures decreases slightly. With the increase of fracture interval, the width of fractures on both sides and in the intermediate increases little, but the length increases obviously. When the interval exceeds 30 m, the interaction between fractures is very small, and the fractures show a trend of parallel propagation. The research content of this paper has guiding significance for optimizing cluster interval in staged fracturing.

Keywords

stress shadows, horizontal wells, multiple fractures, extended finite element method

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