摘要
海上油井钡锶垢清除难度大、作业费用高,需要通过优化除垢剂配方和改进除垢工艺来降低除垢成本。针对涠洲油田群典型井下工况,采用真实垢样开展了除垢剂溶垢实验,从保持除垢效果降低药剂用量和保持药剂用量提高除垢效果两个角度,研发和改进了除垢剂配方;提出了除垢作业与修井作业二合一的工艺改进新思路,初步论证了除垢剂与修井液合二为一的可能性。结果表明,现用药剂SD-132和优选的新剂DTPA的用量降低至8%仍可满足除垢指标要求;研发的以DTPA为主剂的新剂改进配方,在相同质量分数(16%)下比现剂溶垢量可提高13.08%,现剂添加2%~4%DTPA后,溶垢量也可提高14.49%,且新配方对不同类型垢样均适用;除垢剂与修井液二合一具有一定可行性,两者复配后仍可保持良好的除垢和储保性能,若能实现修井作业同时除垢,除垢剂和施工成本将会大大降低,将大幅提高海上油井钡锶垢除垢工艺的经济性。
Due to the difficulty in removing BaSO_(4)/SrSO_(4) scale from offshore oil wells and the high operating costs,it is necessary to optimize the formula of descaling agent and the descaling process to reduce the scale removal cost.A series of descaling experiments were conducted referring to the typical bottom-hole conditions of the oil wells in Weizhou Oilfield.New formulas of descaling agent were developed,and the descaling agent currently used in field was improved,from the point of view of maintaining the descaling effect to reduce the amount of descaling agent or maintaining the amount of descaling agent to improve the descaling effect.A novel concept to improve the descaling process was proposed,in which the descaling operation was combined with the workover operation,and the feasibility thereof was preliminarily assessed.The results show that,the dosage of the current agent SD-132 and the preferred new agent DTPA can be reduced to 8%and still meet the descaling index requirements.The amount of scale dissolved by the developed new formula containing DTPA can be increased by 13.08%compared with the current agent SD-132 at the same mass fraction(16%).After adding 2%-4%DTPA to the current agent SD-132,the amount of scale dissolved can also be increased by 14.49%.The new formula is applicable to different types of scale samples.The combination of descaling agent and workover fluid has a certain feasibility.The combined fluid can still maintain good descaling and formation protection performance.If the workover can achieve descaling at the same time,the cost for descaling agent and operation will be greatly reduced.The economy of the Ba/Sr scale descaling process for offshore oil wells will be greatly improved.
作者
吴绍伟
程利民
万小进
梁玉珠
张亮
康万利
Shaowei Wu;Limin Cheng;Xiaojin Wan;Yuzhu Liang;Liang Zhang;Wanli Kang(Zhanjiang Branch,CNOOC,Zhanjiang,Guangdong 524057,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Key Laboratory of Unconventional Oil and Gas Development(China University of Petroleum(East China)),the Ministry of Education,Qingdao,Shandong 266580,China)
出处
《日用化学工业（中英文）》
CAS
北大核心
2022年第10期1062-1071,共10页
China Surfactant Detergent & Cosmetics
基金
中国海洋石油集团有限公司重大科技项目(CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ)。
关键词
硫酸钡锶垢
除垢剂
溶垢能力
除垢工艺
修井液
BaSO4/SrSO4 scale
descaling agent
scale dissolving ability
descaling process
workover fluid
