中国石油大学学报（自然科学版）2024，Vol.48Issue(2)：126-134,9.DOI:10.3969/j.issn.1673-5005.2024.02.014
环保型改性纳米碳酸钙降滤失剂的合成与性能评价
Synthesis and performance evaluation of environment-friendly modified nano-calcium carbonate filtrate reducer
摘要
Abstract
Nano calcium carbonate exhibits filtration reduction performance and plugging effect in drilling fluid,and it is en-vironmentally friendly.But it has poor dispersion and is easy to agglomerate,resulting in unsatisfactory results.In this pa-per,the surface of nano calcium carbonate was modified by silane coupling agent,and then the monomers with temperature and salt resistant performance were grafted onto the surface of modified particle by free radical copolymerization to obtain modified nano-calcium carbonate fluid loss reducer SDNPJ-2.It was characterized by infrared spectroscopy(FTIR)and ther-mogravimetric analysis,and the comprehensive properties were compared and evaluated.In addition,the adsorption charac-teristics of SDNPJ-2 on clay particles were investigated by particle size of bentonite base mud,Zeta potential analysis,scan-ning electron microscopy(SEM)analysis of clay and the measurement of the adsorption capacity of clay particles further re-veal the mechanisms modified nano-calcium carbonate fluid loss reducer in water base drilling fluids.The results show that SDNPJ-2 can resist high temperature of 230℃.After aging at 150℃/(16 h),adding 1%SDNPJ-2 can make 4%bentonite base slurry,25%brine base slurry,and 10%CaCl2 base slurry API fluid loss decreased by 70%,89%and 85%,respec-tively.It can resist 250000 mg/L of sodium chloride and 100000 mg/L of calcium chloride.The filtration reduction effect is better than that of the same kind of foreign product Driscal D.The BOD5 value is 558 mg/L,and the ratio of BOD5/COD is 22.6%,which is biodegradable.SDNPJ-2 is adsorbed on the clay surface through amide groups to improve its dispersion,optimize the particle size grading of the system,and effectively block the filter cake and formation pores through physical ac-cumulation.The two aspects work together achieve excellent filtration reduction effect.关键词
纳米碳酸钙/降滤失剂/钻井液/耐温耐盐Key words
nano calcium carbonate/filter loss reducer/drilling fluid/temperature and salt resistance分类
石油、天然气工程引用本文复制引用
黄维安,李国真,贾江鸿,张金昭,江琳,余婷,苏锐..环保型改性纳米碳酸钙降滤失剂的合成与性能评价[J].中国石油大学学报（自然科学版）,2024,48(2):126-134,9.基金项目
国家自然科学基金项目(52374026) （52374026）
国家自然科学基金重点课题(51991361) （51991361）
