摘要
深井高温高压地层进行压裂作业时对压裂液提出了更高的要求,为此,通过抗高温稠化剂、抗高温剪切交联剂的合成以及其他主要处理剂的优选,研制出了一种新型抗高温高密度低伤害压裂液体系。室内对压裂液体系进行了性能评价。结果表明:该压裂液体系具有良好的耐高温剪切性能,在180℃,170 s^(-1)条件下剪切140 min后黏度仍可维持在140m Pa·s左右;该体系在加入0.02%破胶剂后,黏度降低至1.3 m Pa·s,说明破胶彻底,有利于压裂后的返排;压裂液体系对储层岩心的伤害率低,具有低伤害特性。现场应用结果显示,压裂后油井产量提高明显,进一步证明了该压裂液体系能够满足深井地层压裂的要求。
The high temperature and high pressure formation fracturing operation in deep well has put forward higher requirements for fracturing fluids, for this purpose, a new type of high temperature and high density low damage fracturing system was developed by the the synthesis of high temperature resistant thickener and anti-high temperature shear crosslinking agent and optimization of other major treatment agents. Performance evaluation of fracturing fluid system was carried out in the laboratory, the results show that the fracturing fluid system has good high temperature shear performance with about 140 mPa·s shear viscosity at 180 ℃ and 170 s^-1 for 140 min. The viscosity of the system was reduced to 1.3 mPa·s after the addition of 0.02% gel breaking agent, which shows that the gel was completely broken and it was beneficial to the back row of fracturing fluid after fracturing. In addition, the damage rate of the fracturing fluid system to the core of the reservoir is low, and the fracturing fluid system has the characteristics of low damage. The field application results show that the oil production increases significantly after fracturing, and which further proves that the developed low damage high temperature and high density fracturing system can meet the requirements of deep well formation fracturing.
出处
《断块油气田》
CAS
北大核心
2017年第4期583-586,共4页
Fault-Block Oil & Gas Field
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"(2015D-5006-0207)
关键词
深井
高温
高密度
压裂液
低伤害
deep well
high temperature
high density
fracturing fluid
low damage
