摘要
考察了不同因素对胍胶压裂破胶液性能及稳定性的影响。实验表明:破胶剂投加量为0.02%(质量分数),破胶时间为60 min,破胶液黏度低于1.5 mPa·s。破胶液黏度和Zeta电位随黏土稳定剂、杀菌剂浓度增加而增大,表面张力随破乳剂和助排剂浓度增大而下降;黏土颗粒对破胶液具有一定的絮凝作用,降低了破胶液的稳定性;油含量<50 mg/L有利于絮体的分散,增加了破胶液的稳定性,而油含量>100 mg/L增加了絮体的碰撞概率,降低了破胶液的稳定性;破胶路径是过硫酸铵分解产生强氧化性硫酸根自由基,首先破坏体系内部的交联点,继而氧化胍胶苯环与糖苷键,产生大量含不饱和键的小分子有机物,最终实现破胶。
The effects of different factors on the performance and stability of guanidine gum fracturing gel fracturing fluid were investigated.When the dosage of gel-breaking agent is 0.02%and gel-breaking time is 60 min,the viscosity of gel-breaking liquid is less than 1.5 mPa·s.The viscosity and Zeta potential of gel-breaking liquid increase with the concentration of clay stabilizer and fungicide,while the surface tension decreases with the increase of demulsifiers and cleaning additive.The clay particles have a certain flocculation effect on gel-breaking liquid,reducing the stability of the gel breaker.Oil content less than 50 mg/L is beneficial for the dispersion of flocs and improves the stability of gel-breaking liquid,while oil content more than 100 mg/L increases the probability of flocs colliding each other and reduces the stability of gel-breaking liquid.The gel-breaking pathway may involves the following steps:Firstly,the internal connections was disrupted by strong oxidizing sulfate ions generated from the decomposition of ammonium persulfate;Secondly,the benzene ring and glycosidic bonds in the guanidine molecules are oxidized into a large number of small molecular weight organic compounds containing unsaturated bonds;Finally,the crosslinking system is destroyed.
作者
孙秀梅
王庆吉
张华
李婷
罗臻
王毅霖
Sun Xiumei;Wang Qingji;Zhang Hua;Li Ting;Luo Zhen;Wang Yilin(CNPC Research Institute of Safety and Environmental Technology,Beijing 102206,China;State Key Laboratory of Petroleum Pollution Control,Beijing 102206,China)
出处
《精细石油化工》
CAS
2023年第5期42-46,共5页
Speciality Petrochemicals
基金
中国石油天然气集团公司重大科技项目-绿色油气田污染防治与生态保护研究(2021DJ6604)。
关键词
破胶
添加剂
黏土
油含量
稳定性
gel-breaking
additives
clay particles
oil content
stability
