水平井薄互层大段多缝纵向扩展影响因素分析

The Analysis of Influence Factors on Vertical Propagation of Multi-fractures of Large Segment in Thin Interlayers of Horizontal Well

为研究地质参数对水平井薄互地层进行水力压裂时裂缝纵向扩展规律的影响,给出了裂缝扩展的基本方程,介绍扩展有限元理论在研究裂缝扩展时的原理和优势。通过基于内聚区模型的扩展有限元模型,在ABAQUS平台建立二维多裂缝扩展数值模型,进行裂缝纵向扩展的单因素分析,并设计正交实验,研究多因素对裂缝纵向扩展的影响,为后续裂缝扩展研究建立基础,并对现场压裂施工提供参考意见。

In order to study the influence of geological parameters on the longitudinal propagation of fracture in the thin-interlayered reservoir during hydraulic fracturing,the basic equation of fracture propagation was given,and the principle and advantage of the extended finite element theory in the study of fracture propagation were introduced.Based on the extended finite element model with the cohesive zone model,a two-dimensional numerical model of multi-fracture propagation was established on the ABAQUS platform.The single factor analysis of longitudinal fracture propagation was carried out,and the orthogonal experiment was designed to study the influence of multi-factors on the propagation.It establishes the foundation for the follow-up study on fracture propagation and provides reference for fracturing designs in the field.