钻井液与完井液2025，Vol.42Issue(3)：324-329,6.DOI:10.12358/j.issn.1001-5620.2025.03.007
两性离子聚合物改性纳米颗粒的抗钙封堵降滤失性能与机理
Performance and Mechanisms of Zwitterionic Polymer Modified Nanoparticles in Calcium Resistance,Plugging and Filtration Control
摘要
Abstract
A high temperature calcium resistant plugging agent ZP-NPs has been developed based on the"anti-polyelectrolyte effect"theory to render water based drilling fluids high temperature stability,high calcium resistance and good plugging capacity.ZP-NPs is obtained by grafting zwitterionic polymer molecules onto the surfaces of nano silica.The microstructure of ZP-NPs was observed using infrared spectrum and electroscope,and the performance of ZP-NPs evaluated through dispersion test,filtration test and plugging test.It was found in these tests that ZP-NPs can stably disperse to nanoparticles/submicron particles for a long time in a high temperature high calcium chloride concentration(160℃,11%CaCl2)solution.A base slurry,after being contaminated by high concentration calcium ions,has a high temperature high pressure(160℃,3.5 MPa)filtration rate that does not exceed 20 mL,and the mud cakes obtained from the test are thin and tough.Fractures of 5 μm in width plugged by a bentonite slurry treated with ZP-NPs can stand pressures up to 5.5 MPa.The calcium resistant performance,plugging capacity and filtration control property of ZP-NPs were revealed through particle size analysis and EDS,and it was found that ZP-NPs has strong"anti-polyelectrolyte"effect;at high calcium concentrations,the particle sizes of ZP-NPs are still in nanometer size range,they can effectively shield the bentonite particles against the adsorption of calcium ions,thus maintaining the dispersion stability and excellent filtration control performance of a bentonite slurry at high calcium concentrations.This study provides a new theoretical and technical guidance for the development of new plugging agents with good calcium resistant capacity.关键词
反聚电解质/抗钙/抗温/降滤失/水基钻井液Key words
Anti polyelectrolyte/Calcium resistant/High temperature/Filtration control/Water based drilling fluid分类
能源科技引用本文复制引用
李文哲,沈欣宇,王锐,杨航,刘兴宝,谯青松..两性离子聚合物改性纳米颗粒的抗钙封堵降滤失性能与机理[J].钻井液与完井液,2025,42(3):324-329,6.基金项目
中国石油西南油气田公司校企联合攻关项目"高密度钻井液抗盐水、抗酸性气体污染机理及对策研究"(20230302-17). （20230302-17）
