摘要
水平井在低渗透油藏开发中得到越来越广泛的应用,而对水平井进行压裂时,只有选择合理的压裂参数才能获得最优的增产效果。利用正交实验方法对水平井压裂参数进行优化研究,并在数值模型中用门限压力考虑启动压力梯度,准确反映出低渗油田的特点。通过对不同实验方案年累计产油量进行极差分析,获得水平井压裂时,不同压裂参数对年累计产油量影响的主次顺序为:裂缝条数、水平段长度、水平段纵向位置、裂缝长度;压裂参数的最优水平值分别为:裂缝条数5条、水平段长度400 m、水平段纵向位置第3层、裂缝长度240 m。
Horizontal well mode is more and more widely used in low permeability reservoir development and reasonable parameters must be selected in order to obtain the optimum yield-increasing effect during horizontal well fracturing. Applied is orthogonal experiment method to conduct optimization study on horizontal well fracturing parameters and in numerical simulation model, characteristics of low permeability oilfield are accurately reflected by application of threshold pressure since it can replace start-up pressure gradient. Through range analysis on cumulative oil production of different experimental schemes, obtained are the primary and secondary effects of different fracture parameters on cumulative oil production during horizontal well fracturing and the sequence of such effects is: the number of fractures, the length of the horizontal well, the lengthwise position of horizontal sections and the length of fracture. The optimal level values of fracturing parameters are respectively: the number of fractures is 5, the length of horizontal section is 400 m, the lengthwise position of horizontal sections is the third layer and the length of fracture is 240 m.
出处
《天然气与石油》
2015年第3期63-66,10,共4页
Natural Gas and Oil
基金
国家科技重大专项"大型油气田及煤层气开发"(2011 ZX 05057-001)
关键词
水平井
压裂参数
正交优化
海洋低渗透
启动压力梯度
Horizontal well
Fracturing parameters
Orthogonal optimization
Marine low permeability
Start-up pressure gradient
