| 水平井水力压裂影响参数的数值模拟 |
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| 引用本文： | 刘志帆,刘志强,施安峰,王晓宏,曾博,李雪丽.水平井水力压裂影响参数的数值模拟[J].地球科学,2017,42(8):1394-1402. |
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| 作者姓名： | 刘志帆 刘志强 施安峰 王晓宏 曾博 李雪丽 |
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| 作者单位： | 1.中国科学技术大学工程科学学院, 安徽合肥 230026 |
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| 基金项目： | 中石油-中科院科技合作项目2015A-4812 |
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| 摘 要： | 水力压裂是低渗油气藏的主要开发手段，传统数值模型所得到的基质-裂缝窜流量以及断裂参数精度不足.为此以流固耦合理论与断裂力学相结合的压裂模型为基础，模拟了水力裂缝扩展过程.在模型中分别引入离散裂缝模型和广义J积分计算基质-裂缝流量交换和断裂参数，并采用动态网格技术对裂缝尖端进行局部加密，以提高模拟的效率和精度.模型计算结果显示，影响水力压裂过程的主要参数中:基质渗透率和压裂液粘度主要影响水力裂缝的最终形态；岩石弹性模量影响裂缝宽度.对压裂车而言，最高工作压力一般都能够满足压裂增产需求，其最大输出功率和最大输出流量是限制压裂能力的主要因素.
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| 关 键 词： | 水力压裂模拟 离散裂缝模型 广义J积分 动态网格技术 数值模拟 石油地质 |
| 收稿时间： | 2017-04-30 |
Numerical Simulation on Influence Parameters of Horizontal Well Hydraulic Fracturing |
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| Abstract: | Hydraulic fracturing is the main development method of low permeability reservoir, so it is important to the engineering to address the issue. By combining the fluid-structure interaction theory with fracture mechanics, the propagation of hydraulic fracture is simulated in this paper. Discrete fracture model and generalized J integral are introduced in the proposed model to calculate the flux across the fracture-matrix interface and fracture parameters, respectively. To ensure high precision and efficient simulation, the adaptive mesh refinement technology is introduced in the grids near the crack tip. The results show that the matrix permeability and viscosity of fracturing fluid mainly influence the final shape of hydraulic fracture, while the elastic modulus of rock mainly influence the fracture width. For fracture trucks, the maximum working pressure can generally meet the demand for fracturing production, and the maximum output power and maximum output flow are the main factors limiting the fracturing capacity. |
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