深水油井测试工况下井筒结蜡区域预测方法  

Prediction of wax precipitation region in wellbore during deep water oil well testing

作　　者：高永海[1,2] 刘凯 赵欣欣 李昊[1,2] 崔燕春 辛桂振[1] 孙宝江 GAO Yonghai;LIU Kai;ZHAO Xinxin;LI Hao;CUI Yanchun;XIN Guizhen;SUN Baojiang(School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China;National Engineering Laboratory for Testing and Detection Technology of Subsea Equipments,Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]海洋水下设备试验与检测技术国家工程实验室,山东青岛266580

出　　处：《石油勘探与开发》2018年第2期333-338,共6页Petroleum Exploration and Development

基　　金：国家重点基础研究发展计划(973)项目(2015CB251205);教育部创新团队项目(IRT_14R58);国家重点研发计划(2016YFC0303303;2017YFC0307304)

摘　　要：针对深水油井测试过程中低温环境容易引起结蜡进而影响测试作业正常进行、增加作业成本和风险的问题,基于深水测试管柱温压场和析蜡条件计算模型,提出了测试管柱内结蜡区域预测方法,并对结蜡区域的影响因素进行了分析。研究表明:结蜡区域随着测试产量的增加而逐渐减小;随着地温梯度降低、水深增加及产出流体含水率降低,发生结蜡的区域会增大;随着地层压力的增加,结蜡区域略有增大;初开井阶段,由于温压场的共同作用,测试管柱内结蜡区域很大;循环测试关井后,随着关井时间的增加,结蜡区域逐渐增大。研究成果可为深水油井测试期间的井筒结蜡预防工作提供指导,以保证测试工作顺利进行。During deep water oil well testing,the low temperature environment is easy to cause wax precipitation,which affects the normal operation of the test and increases operating costs and risks.Therefore,a numerical method for predicting the wax precipitation region in oil strings was proposed based on the temperature and pressure fields of deep water test string and the wax precipitation calculation model.And the factors affecting the wax precipitation region were analyzed.The results show that:the wax precipitation region decreases with the increase of production rate,and increases with the decrease of geothermal gradient,increase of water depth and drop of water-cut of produced fluid,and increases slightly with the increase of formation pressure.Due to the effect of temperature and pressure fields,wax precipitation region is large in test strings at the beginning of well production.Wax precipitation region gradually increases with the increase of shut-in time.These conclusions can guide wax prevention during the testing of deep water oil well,to ensure the success of the test.

关 键 词：深水油气开发 油井测试 井筒结蜡 温度场 压力场 结蜡区域预测中图 

分 类 号：TE358[石油与天然气工程—油气田开发工程]