摘要
针对南美S深水区块含蜡原油在油气测试阶段存在的井筒内流体温度热量散失,温度下降,蜡质析出影响测试作业及资料录取的井筒流动保障问题,提出采用下入气凝胶保温管减小测试管柱在海水段及低温浅层岩土段的热量散失,从而改善管柱内流体流动性设计方案。通过开展井流动仿真及关井CFD仿真,对井筒内的温度场进行模拟分析。模拟结果表明,采用下入气凝胶保温管的测试管柱设计可以有效提高井筒流动温度56℃以上,高于原油析蜡温度,减缓关井井筒温度下降速率,从而保障关井气液分离后液体能够顺利下落至井下安全阀以上高温区域,有效防止原油蜡质析出和水合物形成的风险,可省略柴油浸泡作业环节,提高作业时效。本文研究结果可为后续的工程设计提供依据,助力超深水含蜡油藏和天然气藏的测试作业时效提升以及管柱设计的迭代优化。
Fluid heat loss in the wellbore,temperature drop,and wax precipitation in South American S deepwater block with wax-bearing crude in the oil and gas testing phase affect wellbore flow assurance during operations and data recording.To address these issues,aerogel insulated tubing was run to reduce the heat loss of the test string in the seawater section and low-temperature shallow rock section,so as to improve the fluid flow in the string.The temperature field in the wellbore was simulated and analyzed through the simulation of the open well flow and the CFD simulation of well shut-in.The simulation results show that the test string design using the aerogel insulated tubing can effectively increase the wellbore flow temperature above 56℃,which is higher than the crude oil wax precipitation temperature and slows down the temperature drop rate of the shut-in wellbore.This ensures that the liquid can smoothly fall to the high-temperature area above the underground safety valve after the separation of gas and liquid during shut-in,effectively preventing the precipitation of crude oil wax and hydrate formation,canceling the diesel oil soaking operation link,and improving the operation time.The research results provide a basis for subsequent engineering design,contributing to enhanced operational efficiency in well testing of ultra-deepwater wax-bearing oil and gas reservoirs,while facilitating continuous optimization of string design.
作者
郭鲁
杨秀夫
宋斌
魏剑飞
谭振兴
高永海
GUO Lu;YANG Xiufu;SONG Bin;WEI Jianfei;TAN Zhenxing;GAO Yonghai(CNOOC International Limited,Beijing 100028,China;COSL-EXPRO Testing Services(Tianjin)Co.,Ltd.,Tianjin 300452,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China)
出处
《中国海上油气》
北大核心
2025年第4期173-182,共10页
China Offshore Oil and Gas
关键词
深水
油气测试
井筒流动保障
气凝胶保温管
温度场
仿真分析
deepwater
oil and gas test
wellbore flow assurance
aerogel insulated tubing
temperature field
simulation analysis
