一种新型压裂液

A new type of fracturing fluid

罗平亚 郭拥军 刘通义

Luo Pingya Guo Yongjun Liu Tongyi

在"可逆结构溶液"新型压裂液概念的指导下,研制出一种新型压裂液增稠剂及其压裂液体系。试验研究表明:该体系G′恒大于G″,是典型的粘弹结构溶液;粘度不低于30mPa·s(170s)的体系携砂能力即可满足施工要求;温度为150℃,增稠剂加量仅为0.8wt%时,体系粘度既达到了30mPa·s(170s)以上,且对剪切时间不敏感;破胶液"清洁",对支撑剂导流能力保持在90%以上,岩心渗透率伤害低于10%。中原油田5口井(濮65-9、文99-20、卫10-40、卫侧214、卫355-4井)的应用表明,该新型压裂液施工简单,与常规压裂液相比组分少、配制简单,携砂性能良好,摩阻仅为清水的22%,使用温度已达到120℃,对地层的伤害低,取得了比常规压裂液更好的增产效果。

Guided by the concept of 'reversible structure solution fracturing fluid',a new type of thickening agent as well as a new fracturing fluid system with the agent is developed.Tests show that the system is a typical viscoelastic structure solution with it's G′ constantly bigger than G″;with a viscosity of merely 30mPa·s(170s),the system has a proppant-carrying capacity strong enough for operation;this viscosity can be easily achieved at the temperature of 150℃ by adding only 0.8wt% of the agent into the system and is not sensitive to the shearing time;the system has a "clean" viscosity break fluid,high proppant flow conductivity(more than 90%),and slight damage to core(lower than 10%).The application of the system in five wells,namely P65-9,Wen 99-20,Wei1 0-40,Weiche-214,and Wei 355-4,in Zhongyuan oil field,yields positive stimulation results and causes lesser damage to formations than that of conventional fracturing fluids.It is also user-friendly because of its simpler composition and preparation procedure,excellent proppant carrying capacity,small friction drag(22% of that of fresh water),and higher working temperature(up to 120℃).

10.11743/ogg20070411