尾管固井循环温度预测模型研究

Learning of circulating temperature prediction model for liner cementing

刘洋 郭小阳 艾正青 马勇 李早元

LIU Yang GUO Xiaoyang AI Zhengqing MA Yong LI Zaoyuan

油气藏地质及开发工程国家重点实验室?西南石油大学，四川成都　610500 中国石油塔里木油田公司，新疆库尔勒　841000 中国石油西南油气田公司采气工程研究院，四川广汉　618300

Oil and Gas Reservoir Geology and Exploitation of National Key Laboratory of Southwest Petroleum University, Chengdu 610500, China Tarim Oilfield Company, Korla 841000, China Gas Production Engineering Research Institute of Southwest Oil Gas Company, Guanghan 618300, China

循环温度的准确预测是保证尾管固井施工安全、提高固井质量的基本前提。目前预测方法中实测井温成本高，经验法和API RP 10B反映的是一个区域的平均循环温度，现有的循环预测模型没有针对尾管固井复杂的工艺流程。为科学预测循环温度，根据尾管固井施工流程及井下传热特点建立二维温度模型，通过实测井温验证了模型具备较高的精确度，平均误差仅有1.6 ℃。数值模拟结果表明：对深井而言，冷浆的降温效果很小；钻井液循环阶段与尾管注水泥时刻温度变化规律不同；?177.8 mm尾管固井和?127 mm尾管固井最高循环温度系数分别为0.79和0.84，经验系数法高估循环温度。

Liner cementing operation is difficult and risky; accurate prediction of the circulating temperature is the basic premise of improving the safety and quality of cementing. The method of directly measuring temperature is cost and can not reflect the circulating temperature; empirical method and the API RP 10B reflect a regional average circulating temperature; current circulating temperature prediction models do not aim at complex liner cementing process. In order to predict the liner cementing circulating temperature scientifically, according to the liner cementing operation and features of heat transfer, this paper analyzed different motion states of mud and slurry in cementing process, and created a complex two-dimensional temperature model to predict circulating temperature scientifically, the measured well temperature verified the model has high accuracy; the average error is only1.6 ℃.Numerical simulation results show that: For the deep well cementing, cooling effect of low temperature mud is small, and can be neglected; the laws of temperature change in mud circulation and liner cementing are different; the highest circulating temperature coefficient of ?177.8 mm liner cementing is 0.79, and ?127 mm is 0.84 circulation, empirical method overestimates the circular temperature.