缝洞型碳酸盐岩油藏注气吞吐生产动态及注入介质优选

发布时间：2019-03-15 19:51

【摘要】：塔河油田缝洞型油藏在底水驱动或注水替油开采结束后,仍存在阁楼油、绕流油和井间油等多种剩余油类型。为了获得不同缝洞连通情况下注气吞吐生产动态,揭示不同注气吞吐介质对轻质/重质原油采出程度的影响规律,利用依据地质资料设计的室内三维物理模型,模拟底水条件下典型缝洞结构单元的注水替油过程及注气吞吐过程,考察了相同条件下不同原油黏度(1094.5 mPa·s和23.6 mPa·s)与不同气体介质(N_2、CO_2、复合气(N_2∶CO_2=1∶1))对剩余油的启动效果。结果表明,注气吞吐控水增油效果明显,N_2、CO_2通过重力分异作用可置换阁楼油,通过气体膨胀作用携带井间油及绕流油;对于黏度为1094.5 m Pa·s的稠油,注N_2、CO_2、复合气(N_2∶CO_2=1∶1)对模型采出程度的提高幅度分别为19.59%、14.54%、7.55%,而对黏度为23.6 m Pa·s的稀油,注气吞吐采出程度分别提高10.87%、10.12%、7.41%,注气对稠油的吞吐效果优于稀油,且N_2和CO_2吞吐效果优于复合气(N_2∶CO_2=1∶1)。
[Abstract]:There are many remaining oil types such as attic oil, circumfluence oil and inter-well oil after bottom water driving or water flooding is finished in fracture-cave reservoir of Tahe Oilfield. In order to obtain the dynamic state of gas injection huff and puff production under the condition of different seam and cave connection, the influence of different gas injection huff and puff medium on the recovery degree of light / heavy crude oil is revealed, and the indoor three dimensional physical model designed according to geological data is used. The injection displacement process and gas injection huff-puff process of typical fracture cavity structural units under bottom water condition were simulated. Different crude oil viscosity (1094.5 mPa 路s and 23.6 mPa 路s) and different gas medium (N _ (2), CO _ (2) under the same conditions were investigated. The start-up effect of compound gas (N_2:CO_2=1:1) on remaining oil. The results show that gas injection huff and puff control water to increase oil obviously. Nm 2 and CO 2 can replace pavilion oil through gravity differentiation, and carry well oil and circumfluence oil through gas expansion. For viscous crude oil with viscosity of 1094.5 m Pa 路s, the recovery degree of the model was increased by 19.59%, 14.54%, 7.55% by injection of N ~ (2), CO ~ (2), and composite gas (N_2:CO_2=1:1), respectively. For dilute oil with viscosity of 23.6m Pa 路s, the recovery degree of gas injection was increased by 10.87%, 10.12% and 7.41%, respectively. The effect of gas injection on heavy oil was better than that of dilute oil. Moreover, the huff and puff effect of N ~ (2 +) and CO_2 was better than that of compound gas (N_2:CO_2=1:1).
【作者单位】：中国石油大学(北京)提高采收率研究院;中国石油大学(北京)石油工程教育部重点实验室;中国石化海相油气藏开发重点实验室;
【基金】：国家科技重大专项“碳酸盐岩油田开发关键技术——缝洞型碳酸盐岩油藏提高开发效果技术”(项目编号2011ZX05014-003) 国家“973”计划“碳酸盐岩缝洞型油藏开采机理及提高采收率基础研究——缝洞型油藏提高采收方法研究及优化”(项目编号2011CB20100603)
【分类号】：TE357.7

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