石油钻采工艺2016，Vol.38Issue(3)：352-358,7.DOI:10.13639/j.odpt.2016.03.015
基于细观损伤多相耦合的砂砾岩水力压裂裂缝扩展数值模拟
Numerical simulation on hydraulic fracture propagation in glutenite reservoir based on microscopic damage multiphase coupling
摘要
Abstract
The numerical simulation on hydraulic fracture propagation in low permeability glutenite oil reservoir is of great sig-niifcance to the successful fracturing stimulation of this reservoir. By characterizing the gravel in the glutenite reservoir as a matrix-interface-gravel three modal textures, and assuming that the gravel distribution, geometry and reservoir property meet the random distribution, the mathematical characterization of glutenite reservoir was completed with the Moter-Carolo method. Taking into account the tri-phase coupling of reservoir seepage ifeld, stress ifeld and hydration propagation moisture ifeld, and according to the principles of damage mechanics and fracture mechanics, the microscopic damage ifnite element method was used to establish a mathematical model of hydraulic fracture propagation in glutenite reservoir. This mathematical model was used to simulate and analyze the hydraulic fracture propagation when the fractures encounter gravels under different principal stress differences, matrix-gravel interface strengths and gravel strengths. Finally, numerical simulation of dynamic propagation of hydraulic fractures in glutenite reservoir was completed. The study results show that some phenomena such as bypassing, passing through and arresting occur when hydraulic fracture encounters gravels. Especially, propagation through bypassing gravel predominates. The fracture apparently diverts, and pinnate secondary fractures occur. The fracture diverting level and penetration are related to the principal stress difference, gravel strength and interface strength. Essen-tially, the smaller the horizontal principal stress, the more apparent the diversion of hydraulic fracture when it encounters gravels. As the matrix-gravel interface strength increases, the hydraulic fracture apparently shortens and is dififcult to divert. As the gravel strength increases, the diverting level of fractures increases.关键词
砂砾岩储层/水力裂缝扩展/多相耦合/细观损伤/数值模拟Key words
glutenite reservoir/hydraulic fracture propagation/multiphase coupling/microscopic damage/numerical simulation分类
能源科技引用本文复制引用
余东合,徐康泰,车航,张登文,刘国华,马新仿..基于细观损伤多相耦合的砂砾岩水力压裂裂缝扩展数值模拟[J].石油钻采工艺,2016,38(3):352-358,7.基金项目
中国石油天然气股份有限公司重大科技专项“华北油田上产稳产800万吨关键技术研究与应用”（编号2014E-35-08-03）。 （）
