CO2泡沫双子表面活性剂清洁压裂液研究与试验

Research and Experiments of a Clean Fracturing Fluid System with CO2 Foam Gemini Surfactant

杨浩珑 向祖平 李龙 袁迎中

YANG Haolong XIANG Zuping LI Long YUAN Yingzhong

重庆科技学院石油与天然气工程学院, 重庆 401331; 中国石油西南油气田分公司勘探开发研究院, 四川成都 610051

School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing, 401331, China; Research Institute of Petroleum Exploration & Development, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan, 610051, China

目前常用的压裂液存在与非常规油气储层配伍性差、破胶返排困难和容易对储层造成二次伤害等问题，无法满足非常规油气井压裂施工的需求。为此，结合清洁压裂液和泡沫压裂液的特点，研制了新型双子表面活性剂WG-2，形成了一种CO2泡沫双子表面活性剂清洁压裂液，并对其综合性能进行了评价。评价结果表明：该压裂液具有较强的泡沫稳定性、良好的耐温抗剪切性能、黏弹性能、携砂性能、破胶性能和低伤害特性。CO2泡沫双子表面活性剂清洁压裂液在X-3井进行了现场试验，该井压裂施工过程顺利，压裂后的日产油量是采用羟丙基胍胶压裂液邻井X-4井的2倍多，增产效果显著。室内与现场试验结果表明，该压裂液能够满足非常规油气储层的压裂施工作业，具有良好的推广应用前景。

Current prevailing fracturing fluid systems exhibit problems in the fracturing of unconventional oil and gas reservoirs such as poor formation compatibility,difficult gel breaking and flowback as well as secondary damage to formations,so they cannot meet the requirements of fracturing in unconventional oil and gas wells.To overcome these problems,a new type of gemini cationic surfactant WG-2 was synthesized in combination of the characteristics of clean fracturing fluid and foam fracturing fluid.On this basis,a clean fracturing fluid system with CO2 foam gemini surfactant was developed and its comprehensive performance was evaluated in the laboratory.The evaluation results demonstrated that the fracturing fluid system has strong foam stability,good temperature and shear resistance,viscoelastic properties,sand carrying capacity,gel breaking performance and low damage characteristics.The clean fracturing fluid with CO2 foam gemini surfactant was used in Well X-3 for field tests.The fracturing operation went well,and the daily oil production after fracturing was twice of that from adjacent Well X-4,which had been fractured with the fracturing fluid system of hydroxy propyl guar gum.The results of laboratory and field tests showed that this fracturing fluid system could meet the fracturing operation requirements for unconventional oil and gas reservoirs and also possesses good popularization and application prospects.

中国石油科技创新"基于裂缝变形机理的页岩气藏体积压裂水平井流体流动规律研究"（项目编号：2015D-5006-0207）资助。

https://doi.org/10.11911/syztjs.2018021