石油科学通报2024，Vol.9Issue(3)：503-512,10.DOI:10.3969/j.issn.2096-1693.2024.03.037
耐高温可加重酸性交联压裂液的研发与性能评价
Development and performance evaluation of high-temperature resistant and acidic-crosslinking weighted fracturing fluid
许航 1周福建 1杨飒飒 1李源 2朱丽燕 1姚二冬1
作者信息
- 1. 中国石油大学(北京)油气资源与工程全国重点实验室,北京 102249||中国石油大学(北京)非常规油气科学技术研究院,北京 102249
- 2. 中国石油勘探开发技术研究院,北京 100083
- 折叠
摘要
Abstract
Aiming at the problems of deep burial,high formation pressure and difficult fracturing stimulation of high-tempera-ture deep oil and gas reservoirs,research on high-temperature resistant weighted fracturing fluid was carried out.A polymer thickener TS-700,which is resistant to high temperature and salt,and organozirconium crosslinker OZ-60,which is suitable for acid crosslinking,were independently synthesized in the laboratory,and the additive dosage was optimized to form an acidic-crosslinking fluid system with a temperature resistance of 180℃.The viscosity,drag reduction and delayed crosslinking of the weighted fracturing fluid were studied,and the temperature and shear resistance,sand carrying,gel-breaking,core damage and string corrosion ability were systematically evaluated.The experimental results show that the novel fluid system can be crosslinked under acidic conditions,and the crosslinking time can be controlled within 3～12 min by adjusting the dosage of crosslinker and the pH value.High temperature is conducive to the improvement of viscosity,while the addition of salt will reduce the viscosity of the base fluid.The retention viscosity of the weighted fracturing fluid formula with a density of 1.20 g/cm3 is still greater than 70 mPa·s after shearing for 120 min at 180℃.Weighting agent can reduce the drag reduction performance of fracturing fluid to a certain extent,but under different thickener dosages,the drag reduction rate of the weighted fracturing fluid can still reach more than 68%,which meets the requirement of effectively reducing the friction loss in long wellbores.The crosslinked fracturing fluid showed excellent sand suspension at room temperature and 100℃,with low proppant settling rate.The results of gel-breaking and core damage show that the crosslinked system can achieve complete gel breaking at 0.03%of the dosage of breaker,and the damage rate of gel-breaking liquid to the tight core is only 19.4%.The high-temperature and high-pressure dynamic corrosion test results show that the fully formulated fracturing fluid has a low corrosion rate on N80 and 13Cr steel,which can ensure the safety of the fracturing string in the field.关键词
高温深层/加重压裂液/酸性交联/低摩阻/管柱腐蚀Key words
high-temperature deep reservoir/weighted fracturing fluid/acidic crosslinking/low friction/string corrosion分类
能源科技引用本文复制引用
许航,周福建,杨飒飒,李源,朱丽燕,姚二冬..耐高温可加重酸性交联压裂液的研发与性能评价[J].石油科学通报,2024,9(3):503-512,10.
