摘要
大规模体积压裂技术是目前最普遍的非常规油气藏增产方式。为达到判断压裂施工成功率并制定合理的压后开采制度的目的,针对改造后渗透率、裂缝半长、大规模体积压裂改造区域(SRV)面积等压裂效果评价问题,基于数字滤波压裂停泵数据反演方法,运用纽曼乘积法与杜哈梅原理,开展压裂施工过程中压力在地层中波及范围的计算工作,反演大规模体积压裂改造区域,并应用于国内某区块的一口多段压裂水平井。本文在适用于均质地层的数字滤波压裂停泵数据反演方法基础上,改进了地层压力分布求解算法,首次提出非均质地层压力分布的计算矩阵,并定义了压力传播时间的概念,通过矩阵求解和局部加密网格描绘出了SRV区域形态,形成了SRV区域数据反演技术。例井分析得出平均裂缝半长为145.8 m,SRV区域面积为545884 m^3,现场实测返排量总体相对误差为4.2%。以上方法可以大幅降低成本和提供后续的产能预测,具有重要的指导价值。
Massive stimulated reservoir volume fracturing is the most popular stimulation method for unconventional reservoirs.In order to estimate the effectiveness of fracturing and develop a reasonable production system,the fracturing effects including formation permeability,half-lengths of fractures,and the areas of SRVs need to be evaluated.Based on the digital filtered pump-stop pressure data method,Newman’s method and Duhamel’s principle were adopted to calculate the spread range of the pressure in the process of construction and then obtain the SRV fracturing region area.Then the pump-stop data of a multi-stage horizontal fracturing well in China was analyzed.On the basis of the digital filtered pump-stop pressure data method which applies to the homogeneous formations,a new solving algorithm of formation pressure is improved and the computing matrix of heterogeneous formations is provided.By defining the pressure propagation time,the stimulated reservoir volume area can be described through matrix solving and local grid refining,and a new inversion method of stimulated reservoir volume fracturing region is finally formed.For the example well,the average fracture half-length is 145.8 meters,and the SRV area is 545884 square meters,and the relative error between filed flowback data and the predicting data is 4.2%.The proposed method,which can not only significantly reduce the cost of fracturing effects evaluation but also provide productivity prediction,has important application significance.
作者
张忠林
申峰
徐栋哲
李清宇
Zhang Zhonglin;Shen Feng;Xu Dongzhe;Li Qingyu(Shaanxi Yanchang Petroleum (Group)Co., Ltd., Xi'an, Shaanxi 710075, China;University of Science and Technology of China, Hefei, Anhui 230027, China;Joint Laboratory of USTC-Yanchang Petroleum, Hefei, Anhui 230026, China)
出处
《非常规油气》
2020年第6期81-89,共9页
Unconventional Oil & Gas
基金
中国科大-延长石油联合实验室“低渗透致密储层停泵压裂数据反演技术研究与应用”资助。
关键词
非常规油气藏
压裂效果评价
压裂停泵数据
大规模体积压裂改造区域
Unconventional oil and gas reservoirs
fracturing effect evaluation
pump-stop data of hydraulic fracturing
stimulated reservoir volume fracturing region
