水平井暂堵分段缝间干扰数值模拟方法

Numerical simulation method of fracture interaction during temporary plugging staged fracturing

 王博 周福建 邹雨时 高李阳 胡佳 古小龙

中国石油大学（北京）非常规天然气研究院，北京 102249 中国石油勘探开发研究院采油工程研究所，北京 100083 中国石油大学（北京）石油工程学院，北京 102249 新疆克拉玛依市燃气有限责任公司，新疆 克拉玛依 834000

 为了研究暂堵分段压裂过程中的缝间干扰问题，文中给出了模拟裂缝扩展的基本方程，以及使用桁架模型模拟先压裂缝支撑开度的方法，介绍了扩展有限元方法模拟裂缝扩展的原理与优势。基于XFEM?鄄based CZM（扩展有限元与内聚区模型相结合）和ABAQUS（有限元模拟器），文中建立了二维暂堵分段缝间干扰数值模型，并初步模拟了暂堵分段过程中先压支撑裂缝对周围位移场、应力场以及裂缝扩展形态的影响，为后续开展系统的数值模拟研究提供了方法与模型基础。

 In order to investigate fracture interaction during temporary plugging staged fracturing, this paper presents the basic equations modeling fracture propagation and proposes truss model to simulate propped fracture. Moreover, the principle and advantage of extended finite element method simulating fracture propagation is introduced. Using XFEM-based CZM and ABAQUS, a 2D model for TPSF was established and verification study was carried out. Based on the established model, the effects of previous propped fracture on the displacement fields, the stress fields and the propagation of subsequent fracture were preliminarily investigated, which provides solid method basis to carry out a in-depth corresponding investigation.

10.6056/dkyqt201804021