Low Damage Compound Salt Drilling Fluid for Low Permeability Beach Bar Sand Reservoirs
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摘要: 针对胜利油田滨425区块滩坝砂低渗透油藏低采油速度、低采出程度、低含水的“三低”开发阶段中的水敏、水锁损害为主的特点,结合渗流机理、储层保护原理,优选钻井液关键处理剂,通过“协同增效”作用,研发出一种复合盐低伤害钻井液体系。利用高分辨率CT扫描、扫描电镜SEM等微观评价手段,定量评价、分析了该体系对储层天然岩心的伤害程度和低伤害机制。结果表明,该体系封堵性能强,能最大程度地减少钻井液固相颗粒和滤液进入储层,滤液表面张力低至26.2 mN/m,水锁损害小,渗透率恢复值大于90%。复合盐低伤害钻井液在滨425区块应用了26口井,平均机械钻速为22.80 m/h,平均钻井周期提前11.23 d,有效减少了钻井液对低渗储层的浸泡时间。该体系油气层保护效果显著,所钻新井表皮系数为负数,新井不需要压裂就可直接常规射孔投产,不仅减少新井投产费用,而且增产效果明显,为低渗透油气藏的高效、经济开发提供了一种新方法。Abstract: A low damaging drilling fluid formulated with compound salts has been developed to deal with production problems such as water sensitivity and water block taken place in production stage of "low production rate, low recovery factor and low water-cut" of the low permeability beach bar sand reservoirs in Block Bin425 in Shengli Oilfield. The development of the drilling fluid, based on the mechanisms of flow in porous media and reservoir protection, involved the optimization of key mud additives that functions synergistically in drilling fluid. The drilling fluid was evaluated quantitatively and analyzed with high-resolution CT and SEM for its damage to the permeability of cores taken from the reservoirs and the mechanisms of low damaging. It is concluded that the drilling fluid has high plugging capacity, being able to minimize the invasion of mud solids and filtrates into reservoirs. The surface tension of the filtrates is 26.2 mN/m, indicating low water block of the filtrates. Percent recovery of permeability of cores is greater than 90%. The low damaging compound salt drilling fluid has been successfully used on 26 wells in the Block Bin425, with average ROP of 22.80 m/h, and average drilling time saved by 11.23 d which meant that time for the wellbore to be contacted with drilling fluid was shortened. This drilling fluid is efficient in reservoir protection; the skin factors of the wall of newly drilled borehole were negative, meaning the new wells can be produced without the need for fracturing. This not only reduces the cost for a new well to begin production, it also enhanced the oil recovery of the well. It provides a new way of efficiently and economically developing reservoirs with low permeability.
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[1] 赵金洲,薛玉志,李公让. 胜利油田钻井过程中低渗油气藏的保护对策[J]. 中国石油大学学报, 2007,31(3):148-151.ZHAO Jinzhou,XUE Yuzhi,LI Gongrang. Formation damage control for low-permeability reservoir during drilling operation in Shengli oilfield[J]. Journal of China University of Petroleum, 2007,31(3):148-151. [2] 李阳,曹刚. 胜利油田低渗透砂岩油藏开发技术[J]. 石油勘探与开发, 2005,32(1):123-126.LI Yang, CAO Gang. Development technology of low permeability sandstone reservoir in Shengli oilfield[J]. Petroleum Exploration and Development, 2005,32(1):123-126. [3] 李公让,薛玉志,刘宝峰. 胜利油田低渗透油藏钻井保护技术现状分析及建议[J]. 油气地质与采收率, 2009,16(1):107-110.LI Gongrang,XUE Yuzhi,LIU Baofeng. Present situation analysis and suggestion of drilling protection technology for low-permeability reservoir in Shengli oilfield[J]. Petroleum Geology and Recovery Efficiency, 2009,16(1):107-110. [4] 李秀灵,陈二丁. 低渗透油气藏"协同增效"钻井液及其作用机理[J]. 钻井液与完井液, 2013,30(5):18-21.LI Xiuling, CHENG Erding. Synergistic drilling fluid and its mechanism in low-permeability reservoir[J]. Drilling Fluid & Completion Fluid, 2013,30(5):18-21. [5] 李秀灵,陈二丁. 低伤害钻井液在义北油区的应用[J]. 钻井液与完井液, 2016,33(2):64-68.LI Xiuling, CHEN Erding. Application of low damage drilling fluid in Yibei area[J]. Drilling Fluid & Completion Fluid, 2016,33(2):64-68. [6] 袁丽,郭祥鹃,王宝田. 钻井液用纳米乳液RL-2的研究与应用[J]. 钻井液与完井液, 2005, 22(6):16-21.YUAN Li,GUO Xiangjuan,WANG Baotian. Study and application of nano emulsion RL-2 for drilling fluid[J].Drilling Fluid & Completion Fluid, 2005, 22(6):16-21. [7] MEHRDAD VASHEGHANIFARAHANI, RASA SOLEIMANI, SAEIDJAMSHIDI, et al. Development of a dynamic model for drilling fluid's filtration:implications to prevent formation damage[R]. SPE 168151, 2014. [8] KEGANG LING, HE ZHANG, ZHENG SHEN. A comprehensive approach to estimate invasion radius of mud filtrate to evaluate formation damage caused by overbalanced drilling[R]. SPE 168184, 2014. [9] 邱春阳,王宝田,何兴华,等. 准中I区块提速钻井液技术[J]. 复杂油气藏, 2015, 8(3):71-74.QIU Chunyang,WANG Baotian,HE Xinghua, et al. ROP enhancing drilling fluid technology for block I of central Junggar Basin[J]. Complex Hydrocarbon Reservoirs, 2015, 8(3):71-74. [10] 魏茂伟,薛玉志,李公让,等.水锁解除技术研究进展[J]. 钻井液与完井液, 2009, 26(6):65-68.WEI Maowe i, XUE Yuzhi,LI Gongr ang, e t al. Research progress in water locking removing technology[J]. Drilling Fluid & Completion Fluid, 2009, 26(6):65-68. [11] HUI ZHANG, PAVEL MARINESCU, WILLIAM FOXENBERG, et al. Unique flow-back chemistry for enhancing productivity of low permeability reservoir[R]. SPE 155505, 2012. [12] ROSTAMI A, NASR-EL-DIN H A. Microemulsion vs. surfactant assisted gas recovery in low permeability formations with water blockage[R]. SPE 169582, 2014. [13] JUSTIN GREEN, RUARIDH CAMERON,IAN PATEY, et al. Use of micro-CT scanning visualisations to improve interpretation of formation damage laboratory tests including a case study from the south morecambe field[R]. SPE 165110, 2013. [14] 刘向君,朱洪林,梁利喜. 基于微CT技术的砂岩数字岩石物理实验[J]. 地球物理学报, 2014, 57(4):1133-1139.LIU Xiangjun,ZHU Honglin,LIANG Lixi. Digital rock physics of sandstone based on micro-CT technology[J]. Chinese Journal of Geophysics,2014,57(4):1133-1139. [15] 马天寿,陈平. 基于CT扫描技术研究页岩水化细观损伤特性[J]. 石油勘探与开发, 2014, 41(2):227-233.MA Tianshou, CHEN Ping. Study of meso-damage characteristics of shale hydration based on CT scanning technology[J]. Petroleum Exploration and Development, 2014, 41(2):227-233.
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