摘要
随着深层、超深层油气资源开发力度的不断加大,地层压力逐渐升高,高密度废弃钻井液处理量也不断增长。传统的化学絮凝剂存在成本高、普适性差及潜在的二次污染等问题,利用外加电场是高密度废弃钻井液绿色处理的新手段。在单因素实验的基础上,运用响应曲面法(RSM)研究了电流强度、破胶时间、极板间距3个因素及其交互作用对钻井液体系的Zeta电位和粒径分布的影响。结果表明,在电流强度为8 A、极板间距为3 cm、破胶时间为10 min的条件下,废弃钻井液破胶效果达到最优。破胶后的钻井液体系的Zeta电位上升率为38.29%,达到了−26.2 mV,其体系的粒径分布D90达到了562.5μm。废弃钻井液体系的胶体稳定性得以破坏,为后续体系中有用组分的回收及废弃组分的处理工作提供有力支撑。
As oil and gas wells are drilled deeper and deeper,higher formation pressures need to be balanced with high density drilling fluids,and this leads to another problems:the treatment of more and more high density waste muds.Waste muds are generally treated with chemical flocculants and problems such as high treatment cost,poor universality and potential secondary pollution are the norm.In a study an electric field was applied to treat a high density waste mud.Based on the results of a single-factor experiment,the effects of three factors,i.e.,current intensity,time of gel breaking and the distance between two electrodes,as well as the interaction of the three factors on the Zeta potential and particle size distribution of the drilling fluid were studied using response surface methodology(RSM).It was found that an optimum gel breaking can be obtained when the electric current intensity=8 A,the time of gel breaking=10 min,and the distance between two electrodes=3 cm.After gel breaking,the Zeta potential of the drilling fluid was increased by 38.29%,reaching−26.2 mV,and the particle size distribution factor D90 reached 562.5μm,indicating that the gel stability of the waste drilling fluid was broken,and this provided a powerful support to the subsequent recovery of the useful mud components as well as the treatment of the waste portion of the waste drilling fluid.
作者
王潇辉
王旭东
姜春丽
师浩林
薛迦文
徐加放
WANG Xiaohui;WANG Xudong;JIANG Chunli;SHI Haolin;XUE Jiawen;XU Jiafang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580;School of Petroleum Engineering,Shandong Institute of Petroleum and Chemical Technology,Dongying,Shandong 257061;Drilling Fluid Technology Service Center of SINOPEC Shengli Petroleum Engineering Co.,Ltd.,Dongying,Shandong 257000;Key Laboratory of Unconventional Oil and Gas Development of Ministry of Education,China University of Petroleum(East China),Qingdao,Shandong 266580)
出处
《钻井液与完井液》
CAS
北大核心
2023年第5期622-628,共7页
Drilling Fluid & Completion Fluid
基金
中石化胜利工程公司“高密度钻井液电场破胶与重晶石回收方法研究”项目(SKG2111)
中石油集团公司关键核心技术重大科技攻关项目“抗温240℃以上的环保井筒工作液新材料”联合资助(2020A-3913)。
关键词
水基钻井液
电破胶
ZETA电位
粒径分布
Water based drilling fluid
Electric gel breaking
Zeta potential
Particle size distribution
