塔河碳酸盐岩缝洞型油藏超稠油注氮气实验研究  

Research on nitrogen gas injection in super heavy oil of Tahe carbonate fracture-cave type reservoir

作　　者：郭臣[1] 解慧[1] 聂延波 杨新影[3] 邓博 

机构地区：[1]中国石化西北油田分公司,新疆乌鲁木齐830000 [2]中国石油塔里木油田库车油气开发部,新疆库尔勒841000 [3]中国石油塔里木油田勘探开发研究院,新疆库尔勒841000 [4]中信集团天时能源有限公司勘探开发部,辽宁盘锦124013

出　　处：《油气藏评价与开发》2017年第4期22-26,共5页Petroleum Reservoir Evaluation and Development

基　　金：国家"十三五"重大科技专项"缝洞型稠油油藏注空气/二氧化碳可行性实验"(2016ZX05053-09)

摘　　要：针对塔河碳酸盐岩缝洞型超稠油储量动用程度低、采出程度低、采收率低和掺稀比高的开发现状,在认识碳酸盐岩缝洞型油藏井间连通模式基础上,依据储集性宏观上相似及联通关系可借鉴性的原则,设计制备了裂缝—溶洞简化的缝洞岩心物理模型。在此基础上,运用岩心串联的方式开展了不同注气压力和不同注气量的氮气驱物模实验,通过分析产出气组成、产出油密度和黏度及采收率变化情况,研究了碳酸盐岩缝洞型油藏中注氮气驱替超稠油驱油机理以及对应的采收率变化关系。结果表明,一定范围内随注氮气压力和注气量的增加,超稠油氮气驱的采收率也随之增加;超过一定压力时,氮气因过早突破,采收率反而呈下降趋势;氮气驱主要依靠增压保压、溶解膨胀、抽提等作用驱替超稠油;为认识碳酸盐岩缝洞型超稠油微观连通模式以及超稠油注氮气驱油具体机理提供了借鉴和参考。According to the current development status in super heavy oil of Tahe carbonate fracture-cave type reservoir such as low producing degree, low degree of reserve recovery, low recovery ratio and high blending ratio, and based on the interwell communication model and macro similarity of reservoir properties and referentiability of connection relations, this paper designs physical model of cores with fracture-cave structure. In addition, the core in series combination method is used to carry out physical model- ing experiment of nitrogen gas flooding with different gas injection pressure and volume. By analyzing output gas component, densi- ty, viscosity and recovery ratio variation, the specific mechanism of oil displacement and the corresponding change relation of recov- ery ratio are studied. The results show that, within certain limits, as the increase of gas injection pressure and volume, the recovery ratio of nitrogen gas flooding in super heavy oil increases, however, when the pressure exceeds a certain value and the nitrogen gas breaks through early, the recovery ratio declines. The super heavy oil flooding by nitrogen gas mainly depends on the methods of the increase pressure and holding pressure, solution and expansion, and extraction. The researches provide some references for the interwell communication model and the mechanism of oil displacement by nitrogen gas.

关 键 词：碳酸盐岩 缝洞型油藏 超稠油 注氮气 采收率 物理模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]