CAJ | 학술논문

目前,国内外研究学者应用数值模拟方法研究溶解气驱油藏水平井流入动态时未考虑井筒流动的影响,对于高产、小井径水平井会产生较大的计算误差.针对存在的问题,使用Eclipse油藏数值模拟软件中考虑井筒变质量流与油层中渗流耦合的多段井模型,研究了井筒变质量流动对溶解气驱油藏水平井流入动态的影响.模拟结果表明:当油藏压力较高时,不同油藏衰竭程度时水平井无因次IPR曲线基本重合;但当油藏压力较低时,溶解气析出,油相饱和度减少,油相相对渗透率降低,油藏内两相渗流阻力和水平井筒内两相流动阻力增大,水平井无因次IPR曲线上凸趋势迅速增大.
목전,국내외연구학자응용수치모의방법연구용해기구유장수평정류입동태시미고필정통류동적영향,대우고산、소정경수평정회산생교대적계산오차.침대존재적문제,사용Eclipse유장수치모의연건중고필정통변질량류여유층중삼류우합적다단정모형,연구료정통변질량류동대용해기구유장수평정류입동태적영향.모의결과표명:당유장압력교고시,불동유장쇠갈정도시수평정무인차IPR곡선기본중합;단당유장압력교저시,용해기석출,유상포화도감소,유상상대삼투솔강저,유장내량상삼류조력화수평정통내량상류동조력증대,수평정무인차IPR곡선상철추세신속증대.
At present, solution-gas drive reservoirs inflow performance of horizontal wells has been studied by many researchers using numerical simulation method, but the effect of variable mass flow in horizontal wellbore are not considered, which may lead to calculation error for high-yield or small-diameter horizontal wells. Aiming at the problem above, solution-gas drive reservoirs inflow performance of horizontal wells is studied by using multi-segment well model which couples the reservoir and horizontal well variable mass flow dynamics by Eclipse Reservoir Simulation Software. The effects of variable mass flow in horizontal wellbore on solution-gas drive reservoirs inflow performance are analyzed by simulation calculation. The numerical results indicate that when reservoir pressure is high, the horizontal well dimensionless IPR curves of different reservoir failure degree are basically superposing; but when reservoir pressure is low, because of the precipitation of dissolved gas, oil phase saturation and relatively permeability decrease, the two-phase seepage resistance within reservoir and the two-phase flow resistance in the wellbore increases, so the upper convex trend of the hori-zontal well dimensionless IPR curves increases rapidly.