摘要
为构建新型低伤害复合清洁压裂液体系,在合成阳离子双子表面活性剂的基础上,通过复配非离子表面活性剂以及有机盐助剂,研制出一种新型Gemini表面活性剂复合清洁压裂液体系。室内对压裂液体系进行了性能评价,结果表明120℃、170 s^(-1)条件下剪切90 min后体系黏度仍可维持在90 mPa·s左右,具有良好的耐温抗剪切性能;体系在较低的黏度下仍具有较高的弹性,可以满足携砂要求;体系在室温下放置90 d后黏度几乎没有变化,具有良好的稳定性;使用煤油和地层水破胶20min后的体系黏度均小于5.0 mPa·s,说明体系破胶迅速彻底;破胶液的界面张力分别为0.416 mN/m和0.605 mN/m,有利于压裂破胶液的返排;使用煤油和地层水破胶后的破胶液对天然岩心的伤害率分别为8.71%和12.02%,具有低伤害的特点。现场应用结果分析表明,使用新型Gemini表面活性剂复合清洁压裂液体系的CZ-22井压裂后的日产油量为未压裂邻井CZ-21井的4倍多,压裂增产效果显著。
This paper is aimed at building up a new compounded clean fracturing system of low damage.After cationic Gemini surfactant was synthesized,a new compounded clean fracturing system based on Gemini surfactant was developed by combining nonionic surfactant with organic salt additive.Then,its performance was evaluated in laboratory.It is shown that after this fracturing system is sheared at170s-1under120℃for90min,it is better in temperature and shear resistance and its viscosity is still kept at about90mPa·s.Its elasticity is still higher in the case of lower viscosity,so it can satisfy the demand of proppant carrying.After this fracturing system is set under the air temperature for90d,its viscosity is nearly constant,indicating good stability.Its viscosity is lower than5.0mPa?s after gel breaking for20min by kerosene and formation water.And it is indicated that the gel breaking of this fracturing system is fast and thorough.The interfacial tension of gel breakers is0.416mN/m and0.605mN/m,respectively,which are favorable for the backflow of fracturing gel breaker.After gel breaking by kerosene and formation water,their damage ratios to natural cores are8.71%and12.02%,respectively,presenting the characteristic of low damage.This new type of compounded clean fracturing system based on Gemini surfactant is applied on site in Well CZ-22.It is shown that after the fracturing,the daily oil production of Well CZ-22is four times that of its neighboring unfractured well(Well CZ-21).It is demonstrated that the fracturing stimulation effect of this fracturing fluid system is remarkable.
作者
杨浩珑
李龙
向祖平
袁迎中
YANG Haolong;LI Long;XIANG Zuping;YUAN Yingzhong(School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing 401331, China;PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, Sichuan, China)
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2017年第5期617-622,共6页
Oil Drilling & Production Technology
基金
中国石油科技创新基金项目"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"(编号:2015D-5006-0207)
关键词
GEMINI表面活性剂
复合清洁压裂液
耐温抗剪切
低伤害
增产效果
Gemini surfactant
compounded clean fracturing fluid
temperature and shear resistance
low damage
stimulation effect
