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从影响深水钻井井筒温度分布的因素出发,在常规钻井井筒温度计算理论和模型的基础上,应用能量守恒方法,建立了深水钻井井筒温度预测模型,综合考虑了钻头机械能破岩生热、钻井液循环摩阻生热等诸多热源对钻井液温度场的影响。结果表明,钻头机械能在破岩过程中产生的热量流入地层岩石,钻井液在井底携岩过程中温度产生了瞬时波动,温度波动范围为2～4℃,钻头机械能是研究深水钻井井筒温度场不可忽略的一部分。所建模型的求解结果与实测结果相比,最大误差小于5%,证明该模型具有较高的精度。
Based on the factors affecting the wellbore temperature distribution in deepwater drilling, based on the theory and model of wellbore temperature calculation in conventional drilling, the prediction model of wellbore temperature in deepwater drilling is established by energy conservation method. Friction resistance heat and many other heat sources on the drilling fluid temperature field. The results show that the heat generated by the mechanical energy of the bit during rock breaking flows into the formation rocks. The temperature of the drilling fluid during the biting of the bottom hole produces instantaneous fluctuations in the range of 2 ° C to 4 ° C. The mechanical energy of the bit is used to study the temperature field Can not be ignored part. Compared with the measured results, the maximum error of the proposed model is less than 5%, which proves that the model has higher accuracy.