有限元法超低渗油藏体积压裂裂缝参数优化  

OPTIMIZATION OF THE FRACTURE PARAMETERS IN THE VOLUME FRACTURING OF ULTRA-LOW PERMEABILITY OIL RESERVOIR BY FINITE ELEMENT METHOD

作　　者：郭小勇[1] 赵振峰[1] 徐创朝[1] 杨晓刚[1] 刘振宇[2,3] 王胡振[2,3] 

机构地区：[1]长庆油田公司油气工艺技术研究院,陕西西安710021 [2]东北石油大学石油工程学院,黑龙江大庆163318 [3]中国石油集团公司油气藏改造重点实验室,黑龙江大庆163318

出　　处：《大庆石油地质与开发》2015年第1期83-86,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：黑龙江省自然科学基金项目"鱼骨刺水平井数值模拟方法研究"(A201201)

摘　　要：应用体积压裂技术开发超低渗油藏效果良好,加强体积压裂裂缝参数优化具有重要意义。基于有限元理论,建立油水两相渗流数学模型,应用混合单元有限元法,采用任意三角形单元和线单元描述地层和裂缝,在自然能量开采方式下,以单井为研究对象,对压裂段数及裂缝长度进行优化。结果表明:水平段长度800 m时,2,3,4簇最优压裂段数分别为10,8和7;增加半缝长,可扩大改造体积,增大泄油面积,显著提高措施累计产油量。With the help of volume fracturing technology, ultra-low permeability oil reservoirs are well developed, therefore strengthening the optimization of the fracture parameters has great significance. Based on the finite element theory,the oil-water-phase percolation mathematical model is established. By means of mixed-element finite element method and taking arbitrary triangular element and line element to characterize the formations and fractures, under the condition of the natural energy producing methods, choosing the single well as the research object, both fracturing segment numbers and fracture lengths are optimized. The results show that when the horizontal section length is 800 m, the optimal segment numbers of cluster 2,3 and 4 are respectively 10, 8 and 7; the half length is increased, the reconstructed volume is enlarged, the drainable area is enhanced and the cumulative oil production is improved signif- icantly.

关 键 词：超低渗油藏 有限元法 体积压裂 改造体积 数值模拟 

分 类 号：TE348[石油与天然气工程—油气田开发工程]