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液氮助排技术,是采用延迟胶联技术在压裂液的前置液中加入氮气,形成均匀泡沫冻胶,用来撑开地层,并且在压裂后,靠释放出的氮气反推破胶水化液排出地层,提高压裂液的返排率,减少压裂液对地层的伤害,提高压裂效果。研究结果表明,延迟胶联时间可控制在2～3.5min之间,氮气在高压管汇出口处加入后有充分的时间混合,形成均匀的泡沫冻胶,它具有滤失低、粘度高、耐温能力强等特点;适合高温、低渗透、敏感性地层的改造。1992年,使用该技术现场施工两口井,均取得成功,压裂液的返排率达90％以上,效果明显。
Liquid nitrogen drainage technology is the use of delayed glue technology in the fracturing fluid in the pre-fluid added nitrogen to form a uniform foam gel, used to open the formation, and after the fracture, by the release of nitrogen anti-push back The glue solution is discharged from the formation to improve the fracturing fluid backflow rate, reduce the fracturing fluid damage to the formation and improve the fracturing effect. The results show that the delayed glue time can be controlled between 2 ~ 3.5min. After nitrogen is added at the outlet of the high-pressure pipe, sufficient time is mixed to form a uniform foam jelly, which has the advantages of low filtration loss, high viscosity, Strong temperature capability and other characteristics; suitable for high temperature, low permeability, sensitive formation transformation. In 1992, both wells were successfully constructed on site using the technology, and the fracturing fluid flowback rate reached more than 90% with obvious effect.