压裂水平井压力动态曲线分析  

Analysis of pressure dynamic curve on fractured horizontal well

作　　者：李树臣[1] 邵宪志[2] 付春权[3] 刘宇 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊102800 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]大庆石油学院石油工程学院,黑龙江大庆163318 [4]中海油天津分公司,天津300452

出　　处：《大庆石油地质与开发》2007年第2期71-73,共3页Petroleum Geology & Oilfield Development in Daqing

摘　　要：压裂水平井的渗流过程较之水平井及垂直裂缝井更复杂,其压力动态特征与水平井存在较大差异。因此,引入Gringarten和Ramey提出的源汇函数,建立并求解了压裂水平井渗流的数学模型,获得了压裂水平井井底压力公式,绘制了相应的典型曲线。分析了压裂水平井压力动态典型曲线的特征。研究表明,压裂水平井的压力动态典型曲线与常规水平井的明显不同。完整的压裂水平井的压力导数曲线呈现两个水平段,第一水平段值为N/2,第二水平段值为0.5。相邻两条裂缝相距越近,第一径向流结束的时间就越早。地层各向异性越严重,则第一径向流持续时间就越长。Flow process of fractured horizontal well is more complicated than horizontal well and vertical fractured well, and its pressure dynamic features have much difference with horizontal well. Therefore, with source function presented by Gringarten and Ramey, mathematical model of fractured horizontal well is established. Wellbore pressure expression and corresponding typical curves of fractured horizontal well are also obtained. Dynamic typical curves characteristics of fractured horizontal well are analyzed. The result shows that, pressure dynamic curves of fractured horizontal wells are different from that of normal horizontal well. There are two horizontal lines in pressure derivate curves of fractured horizontal well. The value of first horizontal line is half of number of fractures, while that of second one is 0. 5. The closer the distance between two adjacent fractures is, the earlier the time when the first radial flow finished is. The more serious the anisotropy of reservoirs is, the longer the time when the first radial flow lasted is.

关 键 词：压裂 水平井 压力 源函数 数学模型 

分 类 号：TE353[石油与天然气工程—油气田开发工程]