一种新型纳米SiO_2降压增注剂的制备与评价
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摘要
纳米降压增注技术将憎水亲油类纳米材料作为调剖剂,可有效解决低渗致密油气藏长期注水开发产生的高压欠注等问题。但是,目前此技术所应用的纳米SiO_2增注剂原料成本过高、来源较少且制备过程复杂。本工作以疏水纳米SiO_2、无水乙醇和表面活性剂为原料,提供了一种新型纳米降压增注剂的制备方法,然后分析了其性能和作用机理。结果表明:制备纳米增注剂时,分散液中乙醇质量固定为10%后,1%Tween 80用量时纳米SiO_2用量应少于1%;掺量为0.2%—1%纳米SiO_2的增注剂团聚粒径中值在300～400 nm之间,表面张力介于34～37 mN/m之间,界面张力介于1.9～4.0 mN/m;0.6%纳米SiO_2增注剂可让碳酸盐岩屑吸附纳米颗粒趋于平衡,且吸附为单层吸附;纳米增注剂处理石英砂片后,亲水表面变为疏水表面;0.2%—0.6%纳米增注剂处理岩样后,入口压力变小,驱替流量变大,渗透率约提高了25%～49%;此纳米增注剂注入地层后,随着温度的升高,乙醇挥发,增注剂中的纳米SiO_2会逐渐释放出来,并吸附到岩石表面形成纳米膜,从而起到降压增注的作用。
Nanomaterial step-down augmented injection technology takes hydrophobic and lipophilic nanoparticles as a profile control agent,which can effectively solve the problem of high pressure and low injection caused by long-term waterflooding development in low permeability and dense reservoir. However,the conventional nano-SiO_2 injection agents used in this technology currently are expensive,difficult to access,and complex in preparation process. This contribution presents the preparation of a new type step-down augmented injection agent made of SiO 2 nanoparticles aqueous suspension,using hydrophobic nano-SiO_2,ethanol and surfactant as raw materials,and the analysis upon its performance and action principle. The results show that the dosage of nano-SiO_2 must be less than 1% when the dosage of 1% Tween 80 is used in the preparation of nano-SiO_2 step-down augmented injection agent. The median particle size of 0. 2%-0. 6% nano-SiO_2 injection agent ranges from 300 to 400 nm.The surface tension of 0. 2%-1% nano-SiO_2 injection agent is within 34-37 mN/m and the interface tension is within 1. 9-4. 0 mN/m. 0. 6% of the prepared nano-SiO_2 injection agent can make carbon dioxide debris reach adsorption equilibrium,which accords with the characteristic of single-layer adsorption. After treating by nano-SiO_2 step-down augmented injection agent,the hydrophilic surface of the quartz sand tablets transferred to a hydrophobic one. Moreover,0. 2%-0. 6% nano-SiO_2 step-down augmented injection agent added to the rock samples could achieve smaller inlet pressure,larger displacement flow,and a permeability increment of about 25%-49%. When the nano-SiO_2 step-down augmented was injected into the formation,the ethanol would volatilize with the temperature rising,nano-SiO_2 particles could be released and be adsorbed onto the rock surfaces of the rock to form nano-film. In consequence,it could exert the role of reducing the pressure and enhancing the flow.
Nanomaterial step-down augmented injection technology takes hydrophobic and lipophilic nanoparticles as a profile control agent,which can effectively solve the problem of high pressure and low injection caused by long-term waterflooding development in low permeability and dense reservoir. However,the conventional nano-SiO_2 injection agents used in this technology currently are expensive,difficult to access,and complex in preparation process. This contribution presents the preparation of a new type step-down augmented injection agent made of SiO 2 nanoparticles aqueous suspension,using hydrophobic nano-SiO_2,ethanol and surfactant as raw materials,and the analysis upon its performance and action principle. The results show that the dosage of nano-SiO_2 must be less than 1% when the dosage of 1% Tween 80 is used in the preparation of nano-SiO_2 step-down augmented injection agent. The median particle size of 0. 2%-0. 6% nano-SiO_2 injection agent ranges from 300 to 400 nm.The surface tension of 0. 2%-1% nano-SiO_2 injection agent is within 34-37 mN/m and the interface tension is within 1. 9-4. 0 mN/m. 0. 6% of the prepared nano-SiO_2 injection agent can make carbon dioxide debris reach adsorption equilibrium,which accords with the characteristic of single-layer adsorption. After treating by nano-SiO_2 step-down augmented injection agent,the hydrophilic surface of the quartz sand tablets transferred to a hydrophobic one. Moreover,0. 2%-0. 6% nano-SiO_2 step-down augmented injection agent added to the rock samples could achieve smaller inlet pressure,larger displacement flow,and a permeability increment of about 25%-49%. When the nano-SiO_2 step-down augmented was injected into the formation,the ethanol would volatilize with the temperature rising,nano-SiO_2 particles could be released and be adsorbed onto the rock surfaces of the rock to form nano-film. In consequence,it could exert the role of reducing the pressure and enhancing the flow.
引文
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2 Zhang Z H, Yang Z M, Liu X G, et al. Acta Petrolei Sinica,2012,33(3),437(in Chinese).张仲宏, 杨正明, 刘先贵,等. 石油学报,2012,33(3),437.
3 El-Diasty A I, Aly A M. In: SPE North Africa Technical Conference and Exhibition, Cairo,2015,pp.1.
4 Lv X, Hou J R, Yue X A, et al. Journal of Southwest Petroleum University (Science &Technology Edition),2010,32(4),143(in Chinese).吕鑫, 侯吉瑞, 岳湘安, 等. 西南石油大学学报(自然科学版),2010,32(4),143.
5 Wang K L, Wang C C, Sun L J, et al. In: The 2010 Asia-Pacific Power and Energy Engineering Conference. Chengdu,2010,pp.1.
6 Hu X B, Li S R, Wu H. Journal of Oil and Gas Technology,2012,34(7),129(in Chinese).胡雪滨, 李释然, 吴华. 石油天然气学报,2012,34(7),129.
7 Zhang L, Zhang G C, Jiang P, et al. Materials Review:Review Papers, 2015,29(7),72(in Chinese).张磊, 张贵才, 蒋平, 等. 材料导报:综述篇,2015,29(7),72.
8 Yue Y Z. Study and preparation of the new water-based nanometer polysilicon injection agent. Master’s thesis, Southwest Petroleum University, China,2014(in Chinese).岳渊洲. 新型水基纳米聚硅增注剂的研制, 硕士论文,西南石油大学, 2014.
9 Li S D, Hendraningrat L, Torsaeter O. In: International Petroleum Technology Conference, Beijing,2013,pp.1.
10 Abbas R. Petrophysics,2014,55(1),31.
11 Jiang C J, Duan Z W, Zhang Z Z, et al. Rare Metal Materials and Engineering,2007,36(4),724(in Chinese).江成军, 段志伟, 张振忠, 等. 稀有金属材料与工程,2007,36(4),724.
12 Kevin R, Bernard C. Angewandte Chemie-International Edition,2012,51(52),12943.
13 Li S, Tors?ter O. In: SPE Middle East Oil & Gas Show and Conference, Manama,2015,pp.1.
14 Yuan B, Moghanloo R G, Zheng D. In: Offshore Technology Conference Asia, Kuala Lumpur, 2016,pp.1.
15 Cheng C Y, Di F Q, Wang C Y, et al. Journal of Hydrodynamics,2015,27(2),187.
16 Wang X L, Di Q F, Zhang R L, et al. Acta Physica Sinica,2012,61(14),336(in Chinese).王新亮, 狄勤丰, 张任良, 等. 物理学报,2012,61(14),336.
17 Habibi A, Ahmadi M, Pourafshari P, et al. In: SPE European Formation Damage Conference, Noordwijk,2011,pp.1.