Changing regularity of the wellbore temperature is very critical for drilling quality and safety,while the research of it is rather Limited.A transient heat transfer model is established to predict the well-bore temperature during deep water drilling,by considering the mechanical energy of the drilling rig and the boosted flow at sea floor.The predicted results are compared with the measured data of Well LS25-1-2 in deep water of the South China Sea.The comparison shows that the model results match well with the field measurement,therefore,it is reliable for drilling hydraulic design and temperature control during field operations.Numerical simulations show that the wellbore circulating temperature is greatly influenced by the mechanical energy of the drilling rig and the boosted flow,which must be taken into consideration in drilling process.The theoretical model provides reliable prediction for the wellbore circulating temperature during deep water drilling.%深水钻井循环温度预测关系到钻完井工程的质量及安全可靠性,但目前研究较少.针对深水钻井作业特点,考虑钻头机械磨损、海底增压流量等因素建立了深水钻井过程中井下循环温度场瞬态传热模型,并与南海深水区LS25-1-2钻井实测瞬时数据进行了对比验证,结果表明:本文模型计算结果与实测数据吻合度高,具有较高的可靠性;井下循环温度受钻头机械磨损、井底增压流量的影响较大,因此在计算分析井下循环温度时必须考虑钻头机械磨损和井底增压流量的影响.本文研究成果可为深水钻井井下循环温度的预测提供参考.
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