纳米ZnO增强粘弹性表面活性剂压裂液动态滤失性能研究  

Study on dynamic fluid loss performance of nano-ZnO-enhanced viscoelastic surfactant fracturing fluid

作　　者：杨生文 张亮 张云鹏 金鑫 王世华 陈志畅 王治国[2] YANG Shengwen;ZHANG Liang;ZHANG Yunpeng;JIN Xin;WANG Shihua;CHEN Zhichang;WANG Zhiguo(Engineering Technology Branch,CNOOC Energy Development Co.,Ltd.,Tianjin 300430,China;School of Mechanical Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300450 [2]西安石油大学机械工程学院,西安710065

出　　处：《非常规油气》2023年第5期127-133,共7页Unconventional Oil & Gas

基　　金：陕西省自然科学基金项目“携砂粘弹性表面活性剂压裂液对管柱冲蚀的影响机理研究”(2019JM-268)。

摘　　要：为了对纳米ZnO增强粘弹性表面活性剂(VES)压裂液动态滤失性能进行研究,针对常规VES压裂液不能很好地在地层形成滤饼,容易造成流体地层滤失等问题,将纳米ZnO添加至VES压裂液中,通过流变学测试及动态滤失实验方法,优选纳米ZnO增强VES压裂液配方,研究不同质量分数的纳米ZnO对VES流体流变性能的影响,以及纳米ZnO增强VES压裂液的动态滤失特性及对岩心的伤害。实验结果表明:1)形成的压裂液配方为0.1%纳米ZnO+1.4%十八烷基三甲基氯化铵(OTAC)+0.28%水杨酸钠(NaSal);2)纳米颗粒含量为0.1%时VES流体形成的黏度总体最高,其变化趋势为先增大后逐渐减小,即纳米颗粒的含量应控制在0.1%;3)纳米体系溶液的弹性占主导地位,添加适量的纳米颗粒可以增强VES流体的粘弹性,即添加纳米颗粒质量分数为0.1%;4)VES压裂液体系相比于常规聚合物压裂液,滤失量明显降低,纳米体系VES压裂液滤失量小,有利于VES胶束形成更加稳定的网状结构。该研究成果对同类盆地探区现场压裂的施工具有一定参考价值。In order to research the dynamic fluid loss performance of nano-ZnO-enhanced viscoelastic surfactant(VES)fracturing fluid,in view of the fact that the conventional VES fracturing fluid cannot form a filter cake in the formation well,and it is easy to cause problems such as fluid formation filtration,etc.Adding nano ZnO to VES fracturing fluid.Through rheological test and dynamic fluid loss experimental method,the formula of nano-ZnO-enhanced VES fracturing fluid is optimized.Effects of different mass fractions of nano-ZnO on the rheological properties of VES fluids.To study the dynamic fluid loss characteristics of nano-ZnO-enhanced VES fracturing fluid and its damage to cores.Experimental results show that:1)The formulation of fracturing fluid is 0.1%nano-ZnO+1.4%OTAC+0.28%NaSal;2)When the content of nanoparticles is 0.1%,the viscosity of VES fluid is the highest overall,and its change trend is to increase first and then gradually decrease,that is,the content of nanoparticles should be controlled at 0.1%;3)The elasticity of the nano-system solution is dominant,adding an appropriate amount of nanoparticles can enhance the viscoelasticity of the VES fluid,that is,adding the mass fraction of nanoparticles is 0.1%;4)Compared with the conventional polymer fracturing fluid,the VES fracturing fluid system has a significantly lower filtration loss,and the nano-system VES fracturing fluid has a small filtration loss,which is conducive to the formation of a more stable network structure of VES micelles.The above achievements have certain reference value for the construction of on-site fracturing in exploration areas of similar basins.

关 键 词：纳米颗粒 VES压裂液 流变性 动态滤失 

分 类 号：TE348[石油与天然气工程—油气田开发工程]