稠油井内衬保温油管热损失分析及开采参数优化

Analysis of Heat Loss of Lined Insulation Tubing in Heavy Oil Wells and Optimization of Recovery Parameters

针对塔河油田稠油开采过程中原油热量损失大、资源浪费的问题,开展内衬保温油管开采技术研究。基于井筒稳态热传递与地层非稳态热传递理论,建立了稠油井井筒热传递数学模型,评价了不同内衬材料油管的保温性能,揭示了含水率、日产液量及内衬保温油管下深对井筒温度的影响规律。研究表明:内衬聚酮防腐层与气凝胶保温层的保温油管保温性能最佳,日产液量和保温油管下深对井口温度影响较大,含水率对井口温度的影响较小;日产液量大于72 t/d且保温油管下深大于3 500 m时,可满足稠油开采的温度要求。该研究明确了内衬保温油管保温的可行性,可为油田保温油管内衬的选材、稠油开采工艺参数的制订提供技术依据。

The lined insulation tubing recovery technology was researched to address the problems of large heat loss of heavy oil and waste of resources during the heavy oil recovery process in Taha Oilfield.Based on the theory of steady state heat transfer in the wellbore and non-steady state heat transfer in formation,a mathematical model of heat transfer in the wellbore of heavy oil wells was established,and the heat preservation performance of tubings with different lining materials was evaluated,which reveals the influence of water cut,daily liquid production and depth of tubing insulated with heat preservation tubular on the temperature of the wellbore.The study shows that the tubing insulated with polyketone anticorrosion layer and aerogel insulation layer has the best thermal insulation performance,the daily fluid production and the depth of insulation tubing have a more significant impact on the wellhead temperature,and the water cut has a lesser effect on the wellhead temperature;when the daily fluid production is more than 72 t/d and the depth of insulated tubing is more than 3500 m,which satisfies the temperature requirements of heavy oil recovery.The study results clarify the feasibility of lined insulation tubing,which could provide a technical basis for the selection of lined insulation tubing in oilfield and the formulation of process parameters for heavy oil recovery.