第45卷第6期
石油与天然气化工
CHEMICAL ENGINEERING OF OIL & GAS
一种耐高温低伤害纳米复合清洁压裂液性能评价
乐雷秦文龙杨江
西安石油大学陕西省油气田特种增产技术重点实验室
摘要针对清洁压裂液的耐温性较差、滤失量过大等问题，研制了一种新型的耐高温低伤害纳米复合清洁压裂液。实验结果发现，一定浓度的MWNT能够与蠕虫状胶束形成更为紧密的拟交联三维网状结构且能明显增黏；采用流变性实验优化MWNT质量分数为O.3%，得出纳米复合清洁压裂液配方为3%（w)BET-12两性表面活性剂十O.3%（w)MWNT。性能评价结果表明，在170s-1、150℃下，该压裂液黏度仍能保持在20mPa·s以上；70℃时滤失量相比传统清洁压裂液大大降低；剪切恢复性能良好，体系悬砂性能好，逻地层水或原油中烃类物质能自动破胶，高效且彻底，符合施工要求；对储层伤害较小，裂缝导流能力伤害率仅有8.9%。研究表明，该纳米复合清洁压裂液适合在中高温油气田推广应用。
关键词MWNT两性表面活性剂清洁压裂液高温控滤失
中图分类号：TE357.1+2文献标志码：A
D0I:10.3969/i.issn.1007-3426.2016.06.014
Performanceevaluationofahightemperature-resistant&low
damagenano-VESfluids YueLeiQinWenlong,YangJiang
(Prorincial Key Laboratory of Unusual Well Stimulation ,Xi' an Shiyou Uniuersity , Xi' an 710065, China)
Abstract: Aiming at the problems of clean fracture fluids with low temperature -resistant and high fluid loss , a novel high temperature-resistant and low damage nano-VES fluids was developed. The results show that the tighter three-dimensional network which formed by M WNT and zwitterionic surfactant BET-12 can enhance viscosity when the concentration of M WNT is appropriate . The added M WNT concentration for 3% BET-12 was optimized to be O.3% by rheological measurements . The results of performance evaluation of the nano-VES fluids indicate its viscosity is more than 2O mPa · s at 170 s1 and 150 C .The volume of fluid-loss of nano-VES fluids is obviously lower than base fluids at 7o C, the system with excellent shear restoration and proppant suspension capability .When the nano.VES fluids contact with formation water or hydrocarbon substance , the gel can be quickly broken down. The damage rate of fracture flowed conductivity of the fluid is 8 .9% , showing a less formation damage compared with polymer fluids . Research result shows that the nano-VES fluids can be applied to middle and high temperature reservoir development .
Key words: MWNT, zwitterionic surfactant , VES fluids, high temperature-resistant, fluids-loss control，performanceevaluation
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基金项目：国家自然科学基金项目“热电纳米材料与高分子材料对清洁压裂液的协同增效机理研究”(51304159)和“黏弹性表面活性剂用于油气增产压裂液的应用基础研究”(51174163）陕西省自然科学基金项目“智能型纳米复合清洁压裂液的耐高温抗滤(2015cex140108)。
作者简念：乐重（1991一），西安石油大学油气田开发专业在读硕士研究生，从事黏弹性表面活性剂压裂液流变性方面的研究， E-mail.769@存教糖qq-com