摘要
水平井与直井的流场特征不同，最终开发效果也不同。利用水平井与直井渗流理论得到的流函数和势函数公式，分析对比了这2种类型井的渗流特征差异，即水平井与直井相比，流线和等势线分布更均匀合理，井问压力损失更小，流速分布均匀，水平井开发效率更高。水平井渗流理论和流线数值模拟研究结果表明：部署水平井与直井联合井网时，井网的长宽比和水平井的穿透比对流线的分布影响显著，决定了水平井的最终开发效果，井网长宽比越大，流线分布越接近线性，分流线和主流线长度比应小于1．4，以保证水平井开发效果；在垂向上为避免底水脊进程度过强影响水平井开发效果，水平井应在保证产液能力的情况下尽量布置在油层顶部。
The characteristics of the flow field in a horizontal well are different from those of a vertical well, so are the development effects. Stream function and potential function are derived from the filtration theories of horizontal and vertical wells, the differences of the seepage characteristics of the two types of well are analyzed and contras- ted ： for the horizontal well, comparing with the vertical well, the distributions of flow lines and their equipotential line are more reasonable, the pressure loss is more less, the distribution of flow velocity is more even and the devel- opment efficiency is much higher. The study results of the Seepage theory and flow-line numerical simulation of the horizontal well indicate that when arranging the commingled well pattern between these two kinds of wells, the length breadth ratio of the well pattern and the penetration ratio of the horizontal well have remarkable effects on the distributions of the flow lines, and moreover they will affect the ultimate development effects of the horizontal well. The larger the former ratio is, the closer the distributions of flow lines will be to linearity, the length ratio between the branch streamline and the main streamline should be less than 1.4 so that the development effects of the hori- zontal well can be ensured; in vertical, in order to avoid that the crested degree of the bottom water is so serious that it influence the development results of the horizontal well, under the conditions of maintaining the liquid pro- ductivity, the horizontal well arranged on the top of the oil layer as possible as you can.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2012年第5期83-87,共5页
Petroleum Geology & Oilfield Development in Daqing
关键词
水平井
流场特征
数值模拟
理论分析
horizontal well
characteristic of flow field
numerical simulation
theoretical analysis
