稠油油藏溶剂辅助蒸汽重力泄油启动物理实验和数值模拟研究

发布时间：2019-06-08 13:57

【摘要】：蒸汽辅助重力泄油启动阶段注采井间的有效连通对生产阶段影响较大。现场实践表明,常规蒸汽循环预热时间长,蒸汽消耗量大,热损失严重。为此,设计填砂管注溶剂评价实验装置,通过在不同流速下注入二甲苯溶剂,并对填砂管进行浸泡,评价二甲苯的降粘效果。实验结果表明:随着二甲苯含量的增加,原油粘度显著下降,流动性增强,且无沥青质沉淀产生,当溶剂注入量达到一定值后,降粘效果减弱;油相渗透率随着溶剂注入速度的提高而增大,但增幅逐渐减小;通过带压溶剂浸泡,溶剂向四周扩散,使溶剂的波及面积和降粘范围扩大,油相渗透率增大。新疆A油田某区块的应用结果表明,经溶剂浸泡的井组需要的循环预热时间显著降低,相对缩短60 d左右,节省蒸汽注入量约为4000m~3,转入蒸汽辅助重力泄油生产时,注采井间的连通程度约为85%,取得了较好的连通效果。数值模拟和现场试验结果均表明,蒸汽辅助重力泄油启动阶段注溶剂可缩短蒸汽循环预热时间,减少蒸汽注入量,使注采井间预热均匀,从而提高预热效率和经济效益。
[Abstract]:The effective connection between injection and production wells in the start-up stage of steam assisted gravity oil discharge has a great influence on the production stage. The field practice shows that the conventional steam cycle preheating time is long, the steam consumption is large, and the heat loss is serious. Therefore, an experimental device for evaluating the solvent injection of sand filling tube was designed. The viscosity reduction effect of xylene was evaluated by injecting xylene solvent at different flow rates and soaking the sand filling tube. The experimental results show that with the increase of xylene content, the viscosity of crude oil decreases significantly, the liquidity increases, and no asphaltene precipitation is produced. When the amount of solvent injection reaches a certain value, the viscosity reduction effect is weakened. The permeability of oil phase increases with the increase of solvent injection rate, but the increase decreases gradually. By soaking the solvent with pressure solvent, the solvent diffuses around, which expands the sweep area and viscosity reduction range of solvent and increases the permeability of oil phase. The application results of a block in Xinjiang A Oilfield show that the cycle preheating time required by the well group immersed in solvent is significantly reduced, which is relatively shortened by about 60 days, and the steam injection amount is about 4000 m 路3. When it is transferred to steam assisted gravity discharge production, The degree of connectivity between injection and production wells is about 85%, and good connectivity effect has been obtained. The results of numerical simulation and field test show that solvent injection in the start-up stage of steam assisted gravity discharge can shorten the preheating time of steam cycle, reduce the amount of steam injection, and make the preheating between injection and production wells uniform, thus improving the preheating efficiency and economic benefit.
【作者单位】：中国地质大学(北京)能源学院;中国石油勘探开发研究院提高采收率国家重点实验室;中国石化胜利油田分公司技术检测中心;
【基金】：国家科技重大专项“改善SAGD开发效果技术研究与应用”(2016ZX05012-002)和“稠油、碳酸盐岩和致密油藏开发主体技术与应用潜力”(2016ZX05016-006)
【分类号】：TE345

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