摘要
FS油田在建立CCUS示范区过程中,大部分井钻遇高含CO_(2)气层,导致井筒工作液受酸性气体污染严重,井筒工作液流变性差、泥饼厚、电测遇阻率高。目前用的聚合物膨润土井筒工作液遇到HCO_(3)^(-)、CO_(3)^(2-)时,黏度切力急剧增大,失水不受控制,形成的泥饼最厚4 mm,卡钻风险极高。针对这一问题,通过优选抗HCO_(3)^(-)、CO_(3)^(2-)聚合物类降滤失剂和包被剂,优化膨润土含量,加强井筒工作液抑制性,将井筒工作液体系由适度分散体系变成不分散体系,形成了抗酸根聚合物井筒工作液体系。该体系的抗酸根、强抑制、强护胶、低土相和聚合物优良的触变性,很好地解决了高温流变性差、稳定性差、长时间静止后结构力极强导致开泵困难等技术难题,降低了井下施工风险,提高了井筒工作液安全保障能力。
During the establishment of the CCUS demonstration zone in FS oilfield,most wells encountered high CO_(2)gas layers during drilling,resulting in severe acid gas pollution of the drilling fluid,poor rheological properties,thick mud cake,and high resistance rate in electrical logging.When the polymer bentonite drilling fluid currently used is subjected to carbonate and bicarbonate ions,the viscosity shear force increases sharply and the water loss is not controlled,resulting in a mud cake with a maximum thickness of 4 mm and a high risk of sticking.To solve this problem,the acid radical resistant polymer drilling fluid system was formed by optimizing the anti HCO_(3)^(-)and CO_(3)^(2-)polymer fluid loss additives and coating agents,optimizing the content of bentonite,strengthening the inhibition of drilling fluid,and changing the drilling fluid system from a moderately dispersed system to a non dispersed system.The system's acid radical resistant,strong inhibition,strong gel protection,low transport content and excellent thixotropy of polymer solved the problem of poor high-temperature rheology,poor stability,strong structural force after a long period of standstill leads to technical difficulties such as difficulty in starting the pump,reducing the risk of underground construction and improving the safety guarantee ability of drilling fluid.
作者
曾瑞华
王健
梁婷婷
郭林昊
马俊
ZENG Ruihua;WANG Jian;LIANG Tingting;GUO Linhao;MA Jun(China Southern Petroleum Exploration&Development Corporation,Haikou Hainan 570100,China;Engineering Research Institute of Great Wall Drilling Company,Panjin Liaoning 124010,China)
出处
《辽宁化工》
CAS
2024年第11期1705-1707,共3页
Liaoning Chemical Industry
基金
中国石油天然气股份有限公司重大开发试验项目(项目编号:2022ZS08)。
关键词
抗酸根井筒工作液
聚合物
流变性
Acid-resistant wellbore working fluid
Polymer
Rheological property
