浅薄层稠油油藏水平井CO_2吞吐效果  

Effects of CO_2 Huff and Puff in Horizontal Wells in Shallow-Burial Thin Heavy Oil Reservoirs

作　　者：张娟 周立发[1] 张晓辉 张茂林[3] 樊瑾[4] 杜虹宝 ZHANG Juan;ZHOU Lira;ZHANG Xiaohui;ZHANG Maolin;FAN Jin;DU Hongbao(Department of Geology,Northwest University,Xi＇ an,Shaanxi 710016,China;Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi＇an,Shaanxi 710000,China;School of Petroleum Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China)

机构地区：[1]西北大学地质学系,西安710000 [2]中国石油长庆油田分公司勘探开发研究院,西安710016 [3]西南石油大学石油工程学院,成都610500 [4]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《新疆石油地质》2018年第4期484-490,共7页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05016-005-02)

摘　　要：利用累计增油量和换油率两个指标参数,对冀东油田G区块7口典型水平井CO2吞吐试验效果进行了评价,并利用数值模拟手段对生产历史进行拟合,结合油井地质工艺参数,开展了水平井CO2吞吐提高采收率的作用机理及主要影响因素研究。结果表明,水平井周围含油饱和度越高,CO2吞吐见效越明显;水平井的水平段越长,射开井段越长,注入CO2横向波及范围越大,CO2在底水层中的消耗越少,吞吐效果越好;在CO2吞吐的过程中,CO2不仅溶于原油,还会在注入压力的驱动下,将井底附近的原油驱离井底,使邻井受效;在CO2吞吐结束后,井底附近的含油饱和度大幅度降低,形成"空腔",进而影响下一轮吞吐效果。The paper uses the 2 indexes of accumulative oil increment and oil exchange ratio to evaluate the field test effects of CO2 huffand puff in 7 typical horizontal wells in G block of Jidong oilfield, performs the production history matching through numerical simulationand studies the mechanism of CO2 huff and puff EOR and its main influence factors by combining with geological and engineering parame-ters. The study results show that the higher the oil saturation around horizontal wells, the better the EOR effects by CO2 huff and puff inhorizontal wells; the longer the horizontal section of horizontal wells, the longer the perforated intervals, the larger the laterally swept areasof CO2, and the less of CO2 consumption in bottom-water layer, the better huff and puff effect will be gained. During CO2 huff and puff, CO2 is not only dissolved in the oil, but also can drive the oil away from the well bottom under the injection pressure, which could result in theeffects of adjacent wells. After CO2 huff and puff, the oil saturation around the horizontal well bottom drops dramatically and a cavity willform, which can influence the effect of next cycle of CO2 huff and puff.

关 键 词：冀东油田 浅薄层稠油油藏 水平井 CO2吞吐 数值模拟 累计增油量 换油率 

分 类 号：TE345[石油与天然气工程—油气田开发工程]