苏北复杂断块油藏二氧化碳吞吐效果影响因素分析及认识  

Analysis and Understanding of Influencing Factors of CO Huff and Puff in Complex Fault Block Reservoirs in Subei Basin

作　　者：唐人选[1] 吴公益 陈菊 王婧[1] 王联果[1] 刘娟[1] Tang Renxuan;Wu Gongyi;Chen Ju;Wang Jing;Wang Lianguo;Liu Juan(Taizhou Oil Production Plant of SINOPEC EastChina Oil and Gas Company,Taizhou Jiangsu 225300)

机构地区：[1]中国石化华东油气分公司泰州采油厂,江苏泰州225300

出　　处：《中外能源》2020年第12期32-38,共7页Sino-Global Energy

摘　　要：苏北复杂断块油藏CO2吞吐效果差异较大,为制定和提高CO2吞吐效果有效措施,对苏北油藏吞吐井效果及其主要影响因素进行了分析,这些因素包括注入量、焖井时间、吞吐轮次、井型、原油性质等。分析结果为:增油量随注入量的增大而增大,换油率与注入量及焖井时间存在一个最优值,最佳注入量500t左右,最佳焖井时间30d左右。从井型分析,水平井焖井时间对换油率影响不大,直井适当提高焖井时间有利于提高换油率。换油率随吞吐周期增大而减少,实际吞吐不宜超过三个轮次。吞吐后日产量与吞吐前日产量具有正相关性,在产量较低时增油倍比较高。地层原油黏度高低对换油率没有显著的影响,但地层原油黏度900mPa·s换油率较高。本文的研究成果可以为今后CO2吞吐参数的优化提供一定的借鉴和指导。The performance of CO2 huff and puff in the complex fault block reservoirs of the Subei Basin varies greatly.In order to find effective measures to improve the development of CO2 huff and puff,the results and their main influencing factors,including injection rate,soaking time,huff and puff cycle,well type and crude oil property,are analyzed.The analysis results are as follows :the incremental oil production increases with the increase of the injection rate,there is a best value among the oil change rate,the injection rate and the soaking time,that is,the best injection rate is about 500 t,and the best soaking time is about 30 d.According to the analysis of well type,the soaking time of horizontal well has little influence on the oil change rate,and appropriately increasing the soaking time of the vertical well is beneficial to improve the oil change rate.The oil change rate decreases with the increase of the huff and puff cycle,and the actual huff and puff should less than three cycles.The daily production after huff and puff is positively correlated with that before huff and puff,and the multiple proportion of oil increment is higher when the production is low.The viscosity of formation crude oil has no significant influence on the oil change rate,but the oil change rate is higher when the viscosity of formation crude oil is 900 mPa·s.The research results of this paper can provide reference and guidance for the parameters optimization of CO2 huff and puff in the future.

关 键 词：CO2吞吐 换油率 注入量 焖井时间 原油性质 井型 

分 类 号：TE347[石油与天然气工程—油气田开发工程]