摘要
深水钻井作业时,海水对流换热作用对井内循环温度计算影响显著。考虑海水区域的对流换热,管柱内、环空内流体的轴向、径向热传导,以及管柱壁径向热传导,建立了深水钻井作业井下循环温度场的预测模型,讨论了海水对流换热、有无隔水管和一维、二维地层边界条件的影响。结果表明:海水对流对井下循环温度的影响较大,必须考虑海水区域的对流作用;无隔水管工况下,海域内管柱内流体、筒壁的温度明显低于有隔水管的工况;二维地层边界条件计算速度较慢且计算精度会受影响,无特殊需求推荐采用一维地层边界条件。与现场实测温度对比,本文模型计算值与实测值基本吻合,验证了本文模型的正确性。
The effect of convective heat transfer by the seawater on temperature distribution in wellbores is significant in deep water drilling operations. A model for predicting the temperature distribution was de-veloped taking into account the convective heat transfer, the axial and radial heat conduction by the fluids within both the drill string and annulus, and the radial heat conduction across the drill string pipe wall. In addition, the effects of the seawater convective heat transfer, existence of riser, and ID and 2D formation boundary conditions were also discussed. The modeling results show that the seawater convection signiti- cantly affects the wellbore temperature and should not be ignored; in the absence of the riser, the tempera-ture of the drill string wall and that of the fluid in the string are lower than those in the presence of the ris-er. 2D formation boundary conditions lead to long calculation time and high uncertainty caused by length and number of the radial unit, so ID formation conditions are recommended for numerical calculation un-less specified otherwise. The modeling results agree on the whole with the temperature data measured at the rigsite, verifying the model established here in this paper.
作者
赵琥
刘文成
赵丹汇
郭朝红
姜玉雁
李志刚
ZHAO Hu LIU Wencheng ZHAO Danhui GUO Chaohong JIANG Yuyan LI Zhigang(COSL,Sanhe,Hebei 065201, China Institute of Engineering Thermal Physics ,CAS,Beijing 100000 , China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2017年第3期78-84,共7页
China Offshore Oil and Gas
关键词
深水钻井
井下循环温度场
预测模型
对流换热
传热
隔水管
一维地层边界条件
二维地层边界条件
deep water drilling
temperature distritjution in wellbores during circulation
prediction model
convec-tive heat transfer
riser
ID formation boundary condition
2D formation boundary condition
