裂缝型致密油藏气水交替采油机理定量研究  

Quantitative Study on the Mechanism of Water Alternating Gas Production in Fractured Tight Reservoir

作　　者：戴仪心 郭和坤[2,3] 李海波[2,3] 曾庆桥 孟立新 王睿思 孟焕 高铁宁 DAI Yi-xin;GUO He-kun;LI Hai-bo;ZENG Qing-qiao;MENG Li-xin;WANG Rui-si;MENG Huan;GAO Tie-ning(School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China;Research Institute of Petroleum Exploration and Development-Langfang,Langfang 065007,China;North China Oilfield Exploration and Development Research Institute,Renqiu 062552,China;Dagang Oilfield Exploration and Development Research Institute,Dagang 300280,China)

机构地区：[1]中国科学院大学工程科学学院,北京100049 [2]中国科学院渗流流体力学研究所,廊坊065007 [3]中国石油勘探开发研究院廊坊分院,廊坊065007 [4]华北油田勘探开发研究院,任丘062552 [5]大港油田勘探开发研究院,大港300280

出　　处：《科学技术与工程》2020年第25期10248-10254,共7页Science Technology and Engineering

基　　金：国家科技重大专项(2017ZX05069003);国家基金项目油气重大专项(201705013-001);中石油股份公司重大专项(2017E-1507,2018E-11-05)。

摘　　要：为了揭示不同渗透率储层岩心气驱动用规律及气水交替采油机理,开展基于华北潜山致密油储集层岩样,不同条件下的常规气驱和气水交替实验,并结合核磁共振技术,分析实验不同阶段T 2谱的变化,定量计算孔隙内的油水分布变化情况。研究表明:含裂缝岩心低驱替压力下,采出油量较多,增加驱替压力后,新增采油量很少,增加驱替压力对驱油效率的提高作用不明显;不含裂缝的均质岩心低驱替压力下,采出油量较多,增加驱替压力后,采油量有所提高,增加驱替压力对驱油效率的提高有一定作用;对于裂缝发育岩心,气水交替采油机理主要为水的渗吸作用,从而采出小孔喉内的油,5块岩心气水交替采出油百分数介于5.04%~8.15%,平均为6.58%,其中水的“封堵”作用不明显。To reveal the core gas driving rules and water alternating gas(WAG)recovery mechanism of reservoirs of different permeability,rock samples of dense oil reservoirs of buried hills in North China,conventional gas drive and water alternating gas experiments under different conditions were carried out.Combined with nuclear magnetic resonance technology,the changes of T 2 spectrum in different stages of the experiment was analyzed,the variation of oil-water distribution in pore was quantitatively calculated.Thus,the gas driving law of cores with different permeability was revealed and the mechanism of WAG technology oil recovery was quantitatively evaluated.The results show that under a low displacement pressure of fractured core,oil production is good.After increasing the pressure,oil production was increased only a little,which means that the effect of increasing displacement pressure on oil displacement efficiency is't obvious.Under the low displacement pressure of homogeneous core without fracture,oil production is increased considerably,and after increasing displacement pressure,oil production is obviously increased.For fractured cores,the main mechanism of WAG oil recovery is imbibition,which extracts oil from small pore throat.The percentage of oil produced by water-gas-alternation in five cores ranged from 5.04%to 8.15%,in average of 6.58%,and the“water plugging”effect is not obvious.

关 键 词：裂缝型致密油储层 气驱动用规律 气水交替 核磁共振 微观驱油机理 

分 类 号：TE341[石油与天然气工程—油气田开发工程]