A New Approach for Heterogeneity Evaluation and Well Pattern Adjustment in Low Permeability Reservoirs
-
摘要: 为了进一步改善低渗透油藏非均质储层的注水开发效果,应用油藏工程方法研究了渗透率非均质性与注水开发井网几何形式的耦合作用,引入了渗流因子及渗流因子变异系数,提出了低渗透油藏非均质储层注水井偏移的井网调整新方法,并应用黑油模型数值模拟技术对其进行了适应性评价。将注水井沿井排方向偏移一定距离,井组内渗流因子变异系数降低,且随着砂体渗透率级差的增大、井网内横切比的减小,注水井向低渗砂体方向的偏移距离逐渐增大。注水井偏移最佳距离后,井组产油能力提高了5.6%,含水率下降了3.7%,明显提高了水驱开发效果。提出的非均质性评价方法及注水井最佳偏移量计算式,为低渗透非均质储层注水开发时的井网调整提供了新思路。Abstract: To improve water flooding results in low permeability reservoirs,a new approach used to identify heterogeneous formations for well pattern adjustment was proposed in this paper.The coupling effect of permeability heterogeneity and the geometry of water flooding well pattern had been studied by using reservoir engineering method.In the research,two new factors,seepage factor and variable coefficient of seepage factor,were introduced,then the new method for well pattern adjustment and injector offset were derived from the analysis of the seepage process,its adaptability was evaluated by black oil numerical simulation.The variable coefficient of seepage factor decreases as the increase of injector offset from the orientation of well row.Furthermore,the distance of injector offset is going to be longer as the crosscutting ratio of well pattern goes down and the permeability difference of sand body rises.The production of the well group increased 5.6% and water cut decreased 3.7% after the optimal distance of injector offset,resulting in a significant improvement in water flooding.The proposed approach for heterogeneity evaluation and the formula calculating optimal injector offset provide new ways for well pattern adjustment in heterogeneous and low permeability reservoirs.
-
-
[1] 侯建锋.安塞特低渗透油藏合理开发井网系统研究[J].石油勘探与开发,2000,27(1):72-75. Hou Jianfeng.Reasonable well pattern study for ultra-low permeability reservoirs in Ansai oil field,Changqing oil complex[J].Petroleum Exploration and Development,2000,27(1):72-75. [2] 葛家理,王德民,曲德斌.水平井与直井联合面积布井的开发理论研究(二):七点法面积井网[J].石油勘探与开发,1995,22(2):47-50. Ge Jiali,Wang Demin,Qu Debin.A combination of vertical and horizontal wells,in a 7-spot well pattern[J].Petroleum Exploration and Development,1995,22(2):47-50. [3] 史成恩,李健,雷启鸿,等.特低渗透油田井网形式研究及实践[J].石油勘探与开发,2002,29(5):59-61. Shi Chengen,Li Jian,Lei Qihong,et al.Research and practice on well-pattern type of ultra-low permeability oil field[J].Petroleum Exploration and Development,2002,29(5):59-61. [4] 李松泉,唐曾熊.低渗透油田开发的合理井网[J].石油学报,1998,19(3):52-55. Li Songquan,Tang Zengxiong.The reasonable well pattern for developing low permeability oil fields[J].Acta Petrolei Sinica,1998,19(3):52-55. [5] Parekh B,Kabir C S.Improved understanding of reservoir connectivity in an evolving waterflood with surveillance data.SPE 146637,2011.
[6] Schmalz J P,Rahme H D.The variation of waterflood performance with variation in permeability profile[J].Production Monthly,1950,15(9):9-12.
[7] Ohms D,McLeod J,Graff C J,et al.Incremental oil success from waterflood sweep improvement in Alaska[R].SPE 121761,2009.
[8] 罗万静.混合井网渗流理论及优化布井[D].中国地质大学(北京)能源学院,2009. Luo Wanjing.Theory of fluid porous flow for mixed well patterns and its application in well spacing optimization[D].China University of Geosciences(Beijing),School of Energy Resource,2009. [9] 贾元元.低渗透油藏注水开发井网适应性研究[D].中国石油大学(华东)石油工程学院,2010. Jia Yuanyuan.The research on adaptability of well pattern about water injection in low permeability reservoir[D].China University of Petroleum(Huadong),School of Petroleum Engineering,2010. [10] 李道品,罗迪强.低渗透油田开发的特殊规律[J].断块油气田,1994,1(4):30-35. Li Daopin,Luo Diqiang.The special development law of low permeability oilfield[J].Fault-Block Oil Gas Field,1994,1(4):30-35. [11] 鲜成钢,程浩,郎兆新,等.低渗透油田井网模式研究[J].石油大学学报:自然科学版,1999,23 (2):51-54. Xian Chenggang,Cheng Hao,Lang Zhaoxin,et al.Well patterns for low permeability oilfield[J].Journal of the University of Petroleum,China:Edition of Natural Science,1999,23(2):51-54. [12] 闫宝珍,许卫,陈莉,等.非均质渗透率油藏井网模型选择[J].石油勘探与开发,1998,25(6):51-53. Yan Baozhen,Xu Wei,Chen Li,et al.Selection of well pattern model for a permeability heterogeneous reservoir[J].Petroleum Exploration and Development,1998,25(6):51-53. [13] 曹仁义,程林松,薛永超,等.低渗透油藏井网优化调整研究[J].西南石油大学学报,2007,29(4):67-69. Cao Renyi,Cheng Linsong,Xue Yongchao,et al.Well pattern optimization adjustment for low permeability oilfield[J].Journal of Southwest Petroleum University,2007,29(4):67-69. [14] 王友启.胜利油田高含水期油藏水驱精细调整技术方向[J].石油钻探技术,2011,39(1):101-104. Wang Youqi.Fine adjustment direction of water flooding in high-water cut oil reservoirs of Shengli Oilfield [J].Petroleum Drilling Techniques,2011,39(1):101-104. [15] 曲瑛新.低渗透砂岩油藏注采井网调整对策研究[J].石油钻探技术,2012,40(6):84-89. Qu Yingxin.Adjustment strategy of injection-production patterns for low permeability sandstone reservoirs[J].Petroleum Drilling Techniques,2012,40(6):84-89. [16] 俞启泰,赵明,林志芳.水驱砂岩油田驱油效率和波及系数研究(二)[J].石油勘探与开发,1989,16(3):46-52. Yu Qitai,Zhao Ming,Lin Zhifang.A study of the displacement effciency and the conformance factor in waterflooded sandstone resevoirs in China[J].Petroleum Exploration and Development,1989,16(3):46-52. [17] 计秉玉,李莉,王春艳.低渗透油藏非达西渗流面积井网产油量计算方法[J].石油学报,2008,29(2):256-261. Ji Bingyu,Li Li,Wang Chunyan.Oil production calculation for areal well pattern of low-permeability reservoir with non-Darcy seepage flow[J].Acta Petrolei Sinica,2008,29(2):256-261. [18] 李松泉,程林松,李秀生,等.特低渗透油藏非线性渗流模型[J].石油勘探与开发,2008,35(5):606-612. Li Songquan,Cheng Linsong,Li Xiusheng,et al.Non-linear seepage flow models of ultra-low permeability reservoirs[J].Petroleum Exploration and Development,2008,35(5):606-612.
计量
- 文章访问数: 3350
- HTML全文浏览量: 102
- PDF下载量: 3896
下载:
