基于气相示踪法的CO_2驱优势通道识别  

CO_2 flooding predominant channel identification based on gas tracing method

作　　者：马力[1] 欧阳传湘[1] 王长权[1] 宋岩 林飞 MA Li;OUYANG Chuanxiang;WANG Changquan;SONG Yan;LIN Fei(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Carbon Dioxide Development Company,Petro China Jilin Oilfield Company,Songyuan,Jilin 138000,China;The First Natural Gas Production Plant,Sinopec Southwest Oil/Gas Company,Chengdu 610000,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]中国石油吉林油田分公司二氧化碳开发公司,吉林松原138000 [3]中石化西南油气分公司采气一厂,成都610000

出　　处：《中国科技论文》2018年第12期1440-1444,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(51404037)

摘　　要：低渗透油田CO_2驱由于储层强非均质性和流体黏性指进,极易形成气窜优势通道。为预先认识油藏非均质性,并及时有效抑制气窜,通过室内评价试验研究,从放置时间、温度和静态吸附等多方面对2种气相示踪剂QT-1、QT-5进行优选评价,并对转注的29-33井组进行井间气相示踪监测,跟踪评价CO_2驱矿场试验井组的生产动态,根据气相示踪剂的见剂情况、运移速度和方向,并结合储层连通性结果,对气驱的优势通道进行全面剖析。结果表明,油藏条件下气态示踪剂QT-1、QT-5在油藏中以气相和轻质烃混相与CO_2共存和移动;一线井示踪剂的运移速度较慢,二、三线井速度较快,说明储层裂缝不发育;青一段Ⅰ砂组2号小层注采井的连通性较好,且存在层内非均质性;平行于砂体的西南方向产出浓度较大,说明该方向上存在气驱优势通道;不同示踪剂产出曲线形态对应不同储层特征,单套厚砂体储层表现为"单峰",见剂时间长,产出峰持续时间长;多套薄砂体储层表现为"多峰",见剂时间短,各产出峰持续时间长短不一等特征。For the development of CO 2 flooding in low-permeability oil fields,due to the strong heterogeneity and viscous fingering,it is easy to form the actual situation of the dominant air channel.To understand the heterogeneity of the reservoir in advance,and to obtain the information of the underground fluid distribution status in time,through the indoor evaluating the experimental study,the two gas-phase tracers QT-1 and QT-5 were optimally evaluated in terms of storage time,temperature,and static adsorption,and the cross-valve gas tracer monitoring was performed on the transferred 29-33 well group.The production dynamics of the test wells in the CO 2 drive field was Tracked and evaluated.According to the seeing conditions,migration speed and direction of the gas tracer,and the results of the reservoir connectivity,a comprehensive analysis of the advantages of the gas drive was carried out.The results show that under the condition of reservoir,the gaseous tracers QT-1 and QT-5 coexist and move with gas phase and light hydrocarbon mixed phase with CO 2 in the oil reservoir.The migration speed of the tracer in the first-line well is relatively slow,and the velocity of the second and third line wells faster,indicating that the fracture is not developed.The No.2 small-layer injection and production well of the Qingyi I sands group has good connectivity and there is intra-layer heterogeneity.The production concentration is parallel to the southwest direction of the sand body,indicating that the there are gas-fed advantages in the direction.Different tracer output curve shapes correspond to different reservoir characteristics.A single set of thick sand reservoirs shows“single peak”,long time for seepage,and long duration of output peak;multiple sets of thin sand reservoirs show“Multiple peaks,”short reagents,output peak duration,and other features.

关 键 词：应用化学 CO2驱 优势通道 气体示踪剂 连通性 

分 类 号：TE348[石油与天然气工程—油气田开发工程]