摘要
针对深井超深井钻井中高密度水基钻井液黏度高、易高温增稠等流变性调控难题,以对苯乙烯磺酸钠盐、2-丙烯酰胺基-2-甲基丙磺酸、2-烯丙基-2-甲基氯化铵、烯丙基聚氧乙烯醚为单体,合成了一种抗高温梳型两性离子聚合物降黏剂ZT-1。采用红外光谱表征了降黏剂的分子结构,验证梳型两性离子聚合物合成的成功,采用热重分析表征了降黏剂的热稳定性,其分解温度达250℃。ZT-1具有良好的抗高温耐盐钙降黏分散性能,抗温240℃,可抗饱和盐,抗2%氯化钙;ZT-1加量为0.3%时,老化温度为200℃,在评价浆中的降黏率可达77.7%,在高密度(2.4 g/cm^(3))水基钻井液体系中表观黏度的降低率达33%,塑性黏度的降低率达14%,动切力降低率达67%。ZT-1性能优于阴离子降黏剂磺化丹宁以及常规线性两性离子聚合物降黏剂XY-27和ADS共聚物,这种梳型两性离子聚合物降黏剂在超高温超高密度钻井液中具有良好的应用前景。
In deep and ultra-deep well drilling,high density water based drilling fluids are often faced with rheological problems of high viscosity and thickening at elevated temperatures.To solve these problems,a high temperature comb zwitterionic polymer thinner ZT-1 was developed with monomers including sodium p-styrene sulfonate,2-acrylamido-2-methylpropane sulfonic acid,2-allyl-2-methylammonium chloride and allyl polyoxyethylene ether.Characterization of the molecular structure of the thinner by IR spectrum shows that the synthesis of the comb zwitterionic polymer is successful.GTA characterization of the thinner demonstrates that ZT-1 has decomposition temperature of 250℃.Excellent properties of ZT-1 include high temperature stability and resistance to salt and calcium contamination;ZT-1 functions normally at temperatures up to 240℃,and it is resistant to salt contamination to saturation and to calcium contamination to 2%CaCl_(2),respectively.A base mud treated with 0.3%ZT-1,after aging at 200℃,has its viscosity reduced by 77.7%.High density(2.4 g/cm^(3))drilling fluids can have their viscosity reduced by 33%,plastic viscosity reduced by 14%and yield point reduced by 67%with ZT-1.The performance of ZT-1 is better than that of the sulfonated tannin,XY-27 and ADS,the latter two being regular linear ionic zwitterionic polymers.This comb zwitterionic polymer thinner has good application in ultra-high density drilling fluids for ultra-high temperature drilling.
作者
邓正强
张涛
黄平
罗宇峰
王国帅
贺垠博
蒋官澄
DENG Zhengqiang;ZHANG Tao;HUANG Ping;LUO Yufeng;WANG Guoshuai;HE Yinbo;JIANG Guancheng(CCDC Drilling Fluid Technology Service Co.,LTD,Chengdu,Sichuan 610051;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102200)
出处
《钻井液与完井液》
CAS
北大核心
2024年第2期178-183,共6页
Drilling Fluid & Completion Fluid
基金
中石油川庆钻探工程有限公司钻井液技术服务公司“抗温200℃高密度水基钻井液体系”(CQ2022B-18-1-3)。
关键词
降黏剂
抗高温
水基钻井液
梳型聚合物
Thinner
High temperature resistance
Water based drilling fluid
Comb polymer
