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针对热采井套损十分严重的情况,建立了考虑多场耦合的热采过程井壁受力计算数学模型。借助数值计算软件模拟了热采过程油井周围渗流场和应力场的变化情况,并与辽河油田稠油热采井套损情况对比验证了所建立模型的有效性。通过数值模拟研究分析了热采过程注采参数对套管挤压力的影响规律,研究表明:在开井生产时,随着井底压力的下降,套管承受的挤压力升高;随着注汽速度的增大,套管承受的载荷增加。提出稠油热采过程套损预防措施有:限制油汽井井底压力变化和注汽速度。
Aiming at the very serious casing damage of thermal recovery wells, a mathematic model of borehole stress calculation for thermal recovery process considering multi-field coupling was established. The numerical simulation software was used to simulate the changes of seepage field and stress field around the oil well during thermal recovery and the validity of the model was verified by comparison with the casing damage of heavy oil thermal recovery wells in Liaohe Oilfield. Through numerical simulation, the influence law of injection and production parameters on casing extrusion pressure during thermal recovery process is analyzed. The results show that the extrusion pressure on casing increases with the decrease of bottom hole pressure With the injection speed increases, the casing to withstand the load increase. Proposed heavy oil thermal recovery process of casing damage prevention measures are: limit oil and gas well bottom pressure changes and steam injection speed.