水平井蒸汽驱井底压降数值计算

Horizontal Well Bottom-hole Pressure Drop Steam Flooding Numerical Calculation

在蒸汽驱油过程中提高注汽速度,井口和井底管柱压力将大幅度上升,影响驱油效果。利用数值模拟方法研究了水平井蒸汽驱中注汽速度和蒸汽持液率、水平井小孔数量和孔径对井口和井底管柱压力的影响。计算结果表明,蒸汽注入量越大,井口和井底管柱压力越大;管壁上孔径越大,小孔数量越多,井口和井底管柱压力越小;注入蒸汽持液率越高,井口和井底管柱压力越大。适当减小注蒸汽速度和持液率,增加小孔数量和内径,能有效地减小井口和井底管柱压力。

In the steam flooding process,when steam injection rate is high,wellhead and bottom-hole string pressure substantially increased,oil displacement effect is affected.The numerical simulation method was used to study the process of horizontal steam flooding steam injection rate,steam hold on horizontal liquid rate and the number of holes,pore size to wellhead and bottom-hole pressure and the influence of tubing string.The calculation results show that：the steam injection amount was larger,the more pressure on the bottom of the well and string;the pipe diameter holes on the quantity increased,and the bottom of the well and the smaller string pressure.Injecting steam with more liquid rate,the higher pressure were on the bottom of the well and string.Only properly reduce steam injection rate and the liquid rate,holes quantity and holes were reduced,the inner diameter tubing stress and bottom holes dramatically risen could be effectively reduced.