稠油SAGD水平井完井管柱优化研究

发布时间：2018-11-06 21:17

【摘要】：SAGD水平井技术以其见效快、热能利用率高、采收率高和累计汽油比低等优势而被应用于稠油开采领域,目前已成为开采稠油的主流技术。近年来,为提高SAGD水平井技术开发稠油的效率,国外对SAGD水平井完井管柱进行了优化,开展了长水平段SAGD水平井大尺寸管柱完井和均衡注汽筛管完井的现场试验工作,SAGD水平井效益水平得到显著提升。因此,借鉴国外已取得的技术进步,针对国内SAGD水平井完井技术开展优化研究,对进一步提升稠油生产效率具有重要意义。本文以我国西部X油田SAGD水平井技术开发的主力稠油井区为研究对象,开展了SAGD水平井完井的优化研究工作。根据其油藏地质特征,采用数值模拟方法建立了三维地质模型和井筒模型,模型能模拟SAGD水平井的生产和井筒内压力参数变化的情况,模拟计算了不同完井管柱下的井筒内压力、累计注汽量、累计产油量、累计SOR(汽油比)和蒸汽腔形状。模拟结果发现,现有的177.8mm筛管完井方式最优水平段长度为600m,如果水平段长度大于1000m,常规完井管柱则不能满足生产需要,反而会降低生产效率。因此,对长水平段SAGD水平井完井管柱进行了优化,通过模拟计算分析完井管柱的长度和尺寸对SAGD水平井产能的影响,得到不同水平段长度与其对应的不同完井管柱尺寸,177.8mm筛管完井管柱适应的水平段长度小于800m,219.1mm筛管完井管柱适应的水平段长度在800m至1000m之间,244.5mm筛管完井管柱适应的水平段长度大于1000m。为了进一步提高SAGD水平井的生产效率,模拟预测了长短水平段长度下SAGD水平井均衡注汽筛管不同完井尺寸的生产效果。模拟结果显示,均衡注汽筛管完井与常规完井相比生产效率提高了近40%,并且在长水平段下可将完井管柱尺寸从244.5mm缩小到177.8mm。通过本文的研究,提出了X油田稠油SAGD水平井完井管柱优化方案,采用长水平段、大尺寸完井管柱和均衡注汽筛管完井方法,可以提高X油田稠油SAGD水平井的开采效益。形成的稠油SAGD水平井完井管柱优化方法,为今后国内稠油油藏开发提供了理论依据。
[Abstract]:SAGD horizontal well technology has been used in the field of heavy oil production because of its advantages of fast efficiency, high thermal energy utilization, high recovery efficiency and low accumulative gasoline ratio, and has become the mainstream technology in heavy oil recovery. In recent years, in order to improve the efficiency of developing heavy oil by SAGD horizontal well technology, the completion string of SAGD horizontal well has been optimized in foreign countries, and the field test work of large-size string completion and balanced steam injection sieve pipe completion of long horizontal SAGD horizontal well has been carried out. The benefit level of SAGD horizontal well has been improved significantly. Therefore, it is of great significance to further improve the production efficiency of heavy oil by optimizing the SAGD horizontal well completion technology for reference to the technical progress made by foreign countries. This paper takes the main heavy oil well area developed by SAGD horizontal well technology in West X Oilfield of China as the research object and carries out the optimization research of SAGD horizontal well completion. According to the reservoir geological characteristics, the 3D geological model and the wellbore model are established by numerical simulation method. The model can simulate the production of SAGD horizontal well and the change of pressure parameters in the wellbore. The wellbore pressure, cumulative steam injection, cumulative oil production, cumulative SOR (gasoline ratio) and the shape of steam chamber under different completion string are simulated and calculated. The simulation results show that the optimal horizontal section length of the existing 177.8mm sieve tube completion method is 600m. If the horizontal section length is greater than 1000m, the conventional completion string will not meet the production needs, but will reduce the production efficiency. Therefore, the completion string of SAGD horizontal well in long horizontal section is optimized, and the influence of length and size of completion string on productivity of SAGD horizontal well is analyzed by simulation calculation, and different horizontal section length and corresponding different completion string size are obtained. The length of horizontal section adapted to 177.8mm sieve pipe string is less than 800m / 219.1mm and the length of 244.5mm sieve pipe string is more than 1000m. In order to further improve the production efficiency of SAGD horizontal well, the production effect of balanced steam injection sieve pipe in SAGD horizontal well with different completion dimensions under long and short horizontal section length is simulated and predicted. The simulation results show that the production efficiency of balanced steam injection sieve tube completion well is increased by nearly 40% compared with conventional completion well, and the completion string size can be reduced from 244.5mm to 177.8 mm in long horizontal section. Through the research in this paper, the optimization scheme of completion string of heavy oil SAGD horizontal well in X Oilfield is put forward. The long horizontal section, large size completion string and balanced steam injection sieve tube completion method can improve the production efficiency of SAGD horizontal well in X Oilfield. The optimization method of completion string of heavy oil SAGD horizontal well provides a theoretical basis for the development of heavy oil reservoirs in China.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE925.3

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