Wetting Transition and Water Block Removal of Gas Wetting Nano SiO2 Particles on Rock Cores
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摘要: 使用气湿反转剂能解除凝析气藏等温降压开采过程中产生的液锁损害,但目前的气湿反转剂存在价格高、用量大、气湿反转效果差等缺点。为此,通过采用改进的Stober法制备均一粒径的纳米SiO2颗粒,再对其表面进行功能化修饰,合成出了具备气湿反转功能的纳米颗粒,其最佳合成条件为,正硅酸乙酯和氨水的用量均为1~2 mL,非离子型氟碳表面活性剂FG24的浓度为0.3%。通过接触角法、Owens二液法和自吸吸入法研究了纳米SiO2颗粒对岩心润湿性的影响。研究表明,用0.3%气湿性纳米颗粒流体处理岩心,水相和油相在岩心表面的接触角可由未处理时的23°和0°增至157°和135°;岩心的表面能由67.9 mN/m降至0.23 mN/m;岩心的液相饱和度由87%和73%降至3.5%和32%,水相和油相的自吸速率由0.26和0.27 mL/min在2 h内降至0。实验还测定了气、油相在气(油)-纳米流体-岩心体系中的接触角,探索分析了气湿性纳米SiO2颗粒的作用机理。结果表明,该纳米颗粒具备良好的气湿反转功能。Abstract: Nano SiO2 particles of uniform size were prepared using the improved Stober method and their surfaces functionally modified to render the SiO2 gas wetting.The effect of the wetting nano fluid on the wettability of rock cores was studied using different methods such as angle of contact measurement, Owens method and imbibition method.The studies show thatcores with ultra-strong gas wetting can be made by adding 1-2 mL of ethyl orthosilicate and ammonia, and 0.3% of FG24.Prior to and after treatment of cores with the nano gas wetting fluid, the angles of contact of water and oil on the cores are increased from 23° to 157°, and from 0°to 135, respectively.Imbibition experiments showthat, prior to and after treatment of cores with the nano gas wetting fluid, the water and oil saturations of the cores are reduced from 87% to 3.5%, and from 73% to 32%, respectively, and the imbibition rates of water and oil are reduced from 0.26 mL/min and 0.27 mL/min to 0 mL/min within 2 h.These data indicate that the nano gas wetting fluid has good wetting transition capacity.
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Key words:
- Nano SiO2 /
- Improved Stober method /
- Ultra-strong gas wetting /
- Angle of contact /
- Imbibition
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Kewen L, Abbas F. Experimental study of wettability alteration to preferential gas-wetting in porous media and its effects[J]. SPE Reservoir Evaluation & Engineering,2000, 3(02):139-149. Tang G Q,Firoozabadi A. Relative permeability modification in gas-liquid systems through wettability alteration to intermediate gas-wetting[C]//SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers,2000. Li Kewen.Estimation of wettability in gas-liquid-rock systemsestimation of wettability in gas-liquid-rock systems[J].Geothermics,2008, 37(4):429-443. Fahes M,Firoozabadi A. Wettability alteration to intermediate gas-wetting in gas-condensate reservoirs at high temperatures[J].SPE Journal, 2007,12(4):397-407. 马莉. 气湿性岩样制备及性能评价[D]. 山东:中国石油大学(华东),2012. Ma Li. The preparation and evaluation of gas-wetting core[D]. Shandong:China University of Petroleum(East China), 2012. 冯春燕, 孔瑛,蒋官澄,等. 凝析油气藏气湿反转解水锁的实验研究[J]. 钻井液与完井液, 2011, 28(5):1-4. Feng Chunyan, Kong Ying, Jiang Guancheng, et al. Study of gas-wetting alternation solving liquid-blocking effect in gas-condensate reservoir[J]. Drilling Fluid & Completion Fluid, 2011, 28(5):1-4. 李超, 王辉, 刘潇冰, 等. 纳米乳液与微乳液在油气生产中的应用进展[J]. 钻井液与完井液, 2014, 31(2):79-84. Li Chao, Wang Hui, Liu Xiaobing,et al. The application of nanoemulsion and microemulsion in oil and gas production[J]. Drilling Fluid & Completion Fluid, 2014,31(2):79-84. 张敬辉. 微乳液降低水锁伤害实验研究[J]. 钻井液与完井液,2013,30(2):40-42,46. Zhang Jinghui. Research on reducing reservoir damage of water blocking by micro-emulsion[J]. Drilling Fluid & Completion Fluid,2013,30(2):40-42,46. 王毅,唐成磊,蓝强. 纳米技术在钻井完井液中的应用前景[J]. 钻井液与完井液,2008,25(1):69-71. Wang Yi, Tang Chenglei, Lan Qiang. The application of nanotechnology in drilling and completion fluids[J]. Drilling Fluid & Completion Fluid, 2008, 25(1):69-71. 滕学清,张洁,朱金智,等. 迪那3区块致密砂岩气藏损害机理及储层保护技术[J]. 钻井液与完井液,2015, 32(1):18-21. Teng Xueqing, Zhang Jie, Zhu Jinzhi, et al. Permeability impairment and reservoir protection for tight sand gas reservoir in Block Dina-3[J]. Drilling Fluid & Completion Fluid,2015,32(1):18-21. 金家锋,王彦玲,蒋官澄,等. 气润湿性的评价方法及研究进展[J]. 应用化工,2012,41(9):1604-1607. Jin Jiafeng, Wang Yanling, Jiang Guancheng, et al. Research and progress of the evaluation method of gaswetting[J]. Applied Chemical Industry, 2012,41(9):1604-1607. 董波,兰林,陈智晖,等. 致密气藏岩石毛细管自吸特征研究[J]. 钻采工艺,2012,35(6):34-37. Dong Bo, Lan Lin, Chen Zhihui, et al. Research of capillary imbibition character in tight gas reservoir[J]. Drilling and Production Technology, 2012,35(6):34-37. 齐银,张宁生,任晓娟,等. 裂缝性储层岩石自吸水性实验研究[J]. 西安石油大学学报,2005,20(1):34-36. Qi Yin, Zhang Ningsheng, Ren Xiaojuan, et al. Research of capillary imbibition character in fractured reservoirs[J]. Journal of Xi'an Petroleum University, 2005,20(1):34-36. Wasan D, Nikolov A. The wetting and spreading of nanofluids on solids:Role of the structural disjoining pressure[J]. Current Opinion in Colloid & Interface Science, 2011, 16(4):344-349. Basheva E S, Kralchevsky P A, Danov K D, et al. The colloid structural forces as a tool for particle characterization and control of dispersion stability[J]. Physical Chemisitry Chemical Physics, 2007, 9(38):5183-5198. Nikolov A, Kondiparty K. Nanoparticle self-structuring in a nanofluid film spreading on a solid surface[J]. Langmuir, 2010, 26(11):7665-7670.
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