海上采油井筒温度计算及隔热管柱优化设计  

Calculation of Offshore Oil Production Wellbore Temperature and Optimal Design of Heat-proof String

作　　者：周赵川 王辉[2] 代向辉 李登 徐明海[3] 

机构地区：[1]中海油能源发展有限公司采油技术服务分公司 [2]中石化石油工程设计有限公司 [3]中国石油大学(华东)储运与建筑工程学院

出　　处：《石油机械》2014年第4期43-48,共6页China Petroleum Machinery

基　　金：中海油重点科技攻关项目"热障防蜡管柱工艺研究"(2064F0000071);中石化胜利油田科技攻关项目"胜利油田西部浅层稠油热采地面工程配套技术研究"(YKD1201)

摘　　要：基于海上水平井稠油开采物理模型,考虑空气、海水及地层温度场沿垂深方向线性变化,依据能量守恒定理和传热学原理建立了井筒温度计算数学模型,以井底油温作为方程初值条件,采用四阶龙格-库塔法进行数值求解,对某海上3口油井进行了计算,计算结果与实测数据非常接近,验证了模型和解法的准确性。分析了油井产量、含水体积分数、油管导热系数和下入深度等参数对井口油温的影响。以隔热油管下入深度最低为目标,以产液温度不低于防蜡温度为约束条件,建立了隔热管柱优化设计模型,并引入试射法对优化模型进行求解,结果表明模型预测精度较高。设计隔热油管下深能在用料最省的前提下提高油流温度,避免井筒结蜡,这对原油经济开采具有重要指导意义。In light of the physical model for heavy oil recovery in offshore horizontal wells, and considering the linear change of air, sea water and formation temperature along the direction of vertical depth, the mathematical model of wellbore temperature calculation was established according to the principle of energy conservation and heat transfer. With bottomhole oil temperature as the initial condition of equation, the fourth-order Runge-Kutta algorithm was adopted to conduct a numerical solution. The calculation of three wells in some offshore oilfield was carried out. The findings show that the calculation result is very close to the measured data, verifying the accuracy of the model and solution. The effects of the parameters such as oil well production, water content, thermal conductivity coefficient and running depth of the tubing on wellhead oil temperature were analyzed. With the running depth of heat insulated tubing as the target and with produced fluid~ temperature higher than deparaffinning temperature as the constraint, the optimal design model of heat insulated string was established. The simple-shooting was introduced to solve the optimum model. The findings show that the model prediction precision is high. Design of the running depth of heat insulated tubing will be helpful to improving oil flow velocity in the precondition of maximum material saving, avoiding shaft paraffinning. This is of great significance to the economical recovery of crude oil.

关 键 词：海上采油 井筒温度 数值模拟 防蜡 隔热油管 下入深度 

分 类 号：TE952[石油与天然气工程—石油机械设备]