Layer-crossing propagation law of hydraulic fracture in Shahejie Formation shale reservoir in Bonan Depression
There are abundant shale oil reserves in Bonan Depression,but they are difficult to exploit.The key to effectively developing this kind of reservoir is to improve the layer-crossing ability of hydraulic fractures and form a vertical three-dimensional reconstruction area.In this paper,the author investigated the numerical simulation methods in China and abroad,established a three-dimensional hydraulic fracturing model by ABAQUS numerical simulation software based on the cohesive finite element numerical simulation method,and quantitatively analyzed the influence of Young's modulus of reservoir rock,the cement strength of bedding plane and pumping displacement on fracture layer-crossing ability.The results show that:1)The propagation range and layer-crossing ratio of hydraulic fracture increase with the increase of Young's modulus;2)The layer-crossing ratio fluctuates with the rise in the cement strength of the bedding plane and a larger penetration ratio can be obtained when the cementation strength is at the peak position;3)The contribution of pumping displacement to the fracture layer-crossing effect is limited,and the hydraulic fracture layer-crossing ratio increases first and then tends to be stable with the increase of displacement.In this paper,the author analyzed the sensitivity of the geological and engineering factors,providing an essential theoretical basis for optimizing horizontal wells in shale reservoir volume fracturing.
Bonan Depressionshale reservoirnumerical simulationvolume fracturingcohesive finite element method
万方数据
维普
