石油与天然气化工2024，Vol.53Issue(3)：105-112,8.DOI:10.3969/j.issn.1007-3426.2024.03.017
基于淀粉微球交联剂的低浓度羟丙基胍胶压裂液性能研究
Study on the performance of low-concentration hydroxypropyl guar gel fracturing fluid based on starch microsphere crosslinking agent
陈馥 1杜鹏 1张林 1何坤忆 2钟诚 1贺杰 1罗米娜1
作者信息
- 1. 西南石油大学化学化工学院四川省油气田应用化学重点实验室
- 2. 中国石油西南油气田公司安全环保与技术监督研究院
- 折叠
摘要
Abstract
Objective For low permeability oil reservoirs,reducing the amount of fracturing fluid thickener is important to minimize damage to the reservoir and to ensure that the fracturing fluid has delayed cross-linking,temperature and shear resistance,and proppant carrying capacity.Methods This study aimed to develop a fracturing fluid system that minimizes damage to low-permeability reservoirs.Starch microspheres were synthesized using a reverse-phase emulsion polymerization method,followed by surface modification with silicon ligands and boron hydroxyl groups,to prepare a microsphere-type silicon-boron crosslinker(KBSM)with excellent crosslinking performance and low reservoir damage.Results This study discovered that the KBSM crosslinker could enable multi-active site crosslinking,improve crosslinking density,and consequently reduce the concentration of hydroxypropyl guar(HPG)used on-site in oilfield fracturing.It exhibited delayed crosslinking characteristics with an adjustable 2-6 minutes.The viscosity of 0.2％HPG crosslinked gel was 80 mPa·s after 120 min at 120 ℃ and a shear rate of 170 s-1.The crosslinked gel had a strong proppant-carrying capacity,with a proppant settling rate of 0.116 7 cm/min when the proppant concentration reached 40 wt％.The 0.25％ammonium persulfate breaker effectively broke the gel in low-concentration HPG fracturing operations carried out at 90 ℃,leaving a minimum residual mass concentration of 214 mg/L.Meanwhile,the average damage rate in matrix permeability caused by the broken gel was 26.55％.Conclusion The low-concentration hydroxypropyl guar fracturing fluid based on starch microsphere crosslinking agents has a certain guiding significance for reducing damage to low permeability reservoirs.关键词
淀粉微球/有机硅硼交联剂/羟丙基胍胶/低伤害性Key words
starch microspheres/organosilicon crosslinker/hydroxypropyl guar/low reservoir damage引用本文复制引用
陈馥,杜鹏,张林,何坤忆,钟诚,贺杰,罗米娜..基于淀粉微球交联剂的低浓度羟丙基胍胶压裂液性能研究[J].石油与天然气化工,2024,53(3):105-112,8.
