基于PKN模型的压裂裂缝延展参数计算及分析  

Calculation and Analysis of Fracture Extension Parameters Based on PKN Model

作　　者：张美玲[1] 张天宇 樊家屹 ZHANG Mei-ling;ZHANG Tian-yu;FAN Jia-yi(School of Earth Sciences,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学地球科学学院,大庆163318

出　　处：《科学技术与工程》2019年第5期116-123,共8页Science Technology and Engineering

基　　金：国家自然科学基金(41274132)资助

摘　　要：油田现场水力压裂前期设计常采用直观快捷的PKN模型,该模型假设裂缝空间分布为一均匀的椭球体。基于PKN模型理论公式,将研究区实际压裂参数作为输入,建立压裂缝长的迭代计算方法,并针对两口现场井的典型均质层和非均质层,实现压裂缝长的预测计算。通过构建岩层渗透率非均质参数,利用微地震实测压裂缝长数据,研究储层非均质性对裂缝两翼缝长的影响关系,指出岩层的非均质系数越大,裂缝两翼延展的不对称性越强。研究发现,由岩层非均质参数可以估算实际压裂缝长与预测裂缝长之间的最大偏差,该结果可以很好地修正实际压裂前期设计中PKN模型的预测结果,有效地提升压裂施工工艺的成功率。In the early stage design of hydraulic fracturing in oil field, intuitionistic and quick PKN model is often adopted. The model assumes that the spatial distribution of fractures is a uniform ellipsoid. Theoretical formula based on PKN model, the actual fracturing parameters of the study area are used as input, iterative calculation method for establishing fracture length.and typical homogeneous and heterogeneous layers in two field wells are also studied for predicting and calculating of fracture length for fracturing. Construction of heterogeneity parameters of rock permeability, measurement of fracture length data by microseismic measurement, to study the influence of reservoir heterogeneity on the fracture length of two wings, it is pointed out that the larger the heterogeneity coefficient of rock formation, the stronger the asymmetry of the extension of fracture flanks. Studies have found that the maximum deviation between the actual fracture length and the predicted fracture length can be estimated from the heterogeneity parameters of strata, the results can improve the prediction results of the PKN model in the early stage of actual fracturing design, and effectively enhance the success rate of fracturing technology.

关 键 词：影响分析 渗透率 非均质性 PKN模型 水力压裂缝 微地震资料 

分 类 号：TE343[石油与天然气工程—油气田开发工程]