高压环境双水平井SAGD三维物理模拟实验

发布时间：2018-02-08 10:47

本文关键词： 热力采油蒸汽辅助重力泄油高压环境双水平井物理模拟　出处：《石油学报》2017年04期 　论文类型：期刊论文

【摘要】：针对原始地层压力较高且难于在短期内降压的特稠油油藏,为了研究双水平井SAGD在高压环境下的开发效果,利用高温、高压三维物理模拟系统进行了SAGD物理模拟实验,并分析了在原始地层压力较高的特稠油油藏中进行SAGD生产的各项特征。研究结果表明:与低压环境下的SAGD生产过程相比,在高压环境下蒸汽腔发育过程虽然也分为3个阶段,但是蒸汽腔体积小,横向扩展范围有限;生产过程中没有出现稳产阶段,产油速率和油汽比在达到最大值以后迅速降低,大量原油在高含水和低油汽比阶段被产出;生产过程中热损失速率先缓慢、后迅速增加,最后保持稳定,与蒸汽腔发育的3个阶段相对应。根据实验研究结果可知,在高压环境下进行SAGD生产难以取得较为理想的开发效果,低压环境下SAGD开发的采收率远高于高压环境下SAGD的采收率。因此,高压环境下实施SAGD不能有效释放蒸汽潜热从而提高稠油油藏采收率,在能降低油藏压力的条件下,应首先利用适当工艺措施降低油藏平均压力,再实施SAGD开发。
[Abstract]:In order to study the development effect of double horizontal well SAGD in high pressure environment, the SAGD physical simulation experiment was carried out by using the high temperature and high pressure 3D physical simulation system, aiming at the ultra-heavy oil reservoir with high original formation pressure and difficult to reduce the pressure in a short period of time, in order to study the development effect of double horizontal well SAGD in high pressure environment. The characteristics of SAGD production in ultra-heavy oil reservoirs with high original formation pressure are analyzed. The results show that compared with the SAGD production process under low pressure environment, the steam cavity development process in high pressure environment is also divided into three stages. However, the volume of the steam chamber is small, the transverse expansion range is limited, there is no stable production stage in the production process, the oil production rate and the oil-steam ratio decrease rapidly after the maximum value, and a large amount of crude oil is produced at the stage of high water cut and low oil / gas ratio. In the process of production, the rate of heat loss is slow first, then increases rapidly, and then keeps stable, corresponding to the three stages of the development of steam chamber. It is difficult to obtain ideal development effect for SAGD production under high pressure environment, and the recovery factor of SAGD under low pressure environment is much higher than that of SAGD under high pressure environment. The application of SAGD in high pressure environment can not effectively release latent heat of steam and improve the recovery efficiency of heavy oil reservoir. Under the condition that the reservoir pressure can be reduced, the proper technological measures should be used to reduce the average reservoir pressure first, and then the SAGD development should be carried out.
【作者单位】：中国石油大学石油工程教育部重点实验室;中海石油(中国)有限公司天津分公司渤海研究院;中国石油辽河油田公司钻采工艺研究院;
【基金】：国家重大科技专项(2016ZX05031-003-004)资助
【分类号】：TE319;TE345

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