超稠油油藏直井与水平井组合SAGD技术研究  

SAGD process with the combination of vertical and horizontal wells in super-heavy oil reservoir

作　　者：刘尚奇[1] 王晓春[1] 高永荣[1] 杨立强[2] 由世江[2] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油辽河油田公司

出　　处：《石油勘探与开发》2007年第2期234-238,共5页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司"十五"超前共性科技项目"稠油油藏高轮次吞吐后转换开发方式对策研究"(040502-08)

摘　　要：辽河油田曙一区杜84块兴隆台油层兴Ⅵ组为厚层块状超稠油油藏,50℃下脱气原油黏度大于100Pa.s。针对该油藏的地质特征、原油性质与开发现状,分析了直井与水平井组合蒸汽辅助重力泄油(SAGD)技术的适应性,在现有直井已吞吐多个周期、地层压力已大幅下降的情况下,应用数值模拟技术研究了直井与水平井组合SAGD技术的水平井部署方式并对SAGD注采参数进行了优化。研究结果表明,直井与水平井组合SAGD技术是杜84块兴Ⅵ油层组超稠油油藏蒸汽吞吐后的有效接替技术,可提高原油采收率30%,累计油汽比可达到0.296。最佳的布井方式为水平生产井在两排垂直井中间,且位于侧下方,垂向距离为20m,水平井段长度为280m;井底注汽干度必须大于70%,且生产井排液速度必须与注汽井注汽速度相匹配。Xinglongtai Formation in Block Du 84 of the Shu-1 heavy oil area, Liaohe Oilfield, is a massive-block extra-heavy oil reservoir, with the oil viscosity greater than 100Pa·s at 50℃. This paper presents the feasibility of SAGD process with the combination of vertical and horizontal wells based on the reservoir characteristics, oil properties and development status. Well patterns are investigated using numerical simulation, and the parameters of injection and production are optimized after several cycles of steam stimulation with the formation pressure greatly reduced. The SAGD process is viable and the recovery factor is increased by 30.0% with the cumulative oil steam ratio of 0. 296. The optimum well pattern is that horizontal wells with 20m apart are drilled between and beneath two rows of vertical wells. The horizontal well length is 280m. The steam quality at down-holes must be greater than 70% and the drawdown capacity in production wells have to be matched with the iniection rate in injection wells.

关 键 词：超稠油 接替技术 蒸汽辅助重力泄油(SAGD) 水平井 

分 类 号：TE345[石油与天然气工程—油气田开发工程]