一种新型油藏气驱采收率预测图版  

A novel type curve for estimating oil recovery factor of gas flooding

作　　者：汤勇[1] 张皓川 何佑伟 郭晓东 范坤[3] 伍藏原[3] 周代余[3] 陶正武[3] 李金龙[4] TANG Yong;ZHANG Haochuan;HE Youwei;GUO Xiaodong;FAN Kun;WU Zangyuan;ZHOU Daiyu;TAO Zhengwu;LI Jinlong(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Research Institute,Shenzhen Branch Company,CNOOC Ltd.,Shenzhen 518000,China;Research Institute of Exploration and Development,PetroChina Tarim Oilfield Company,Korla 841000,China;Research Institute of Exploration and Development,PetroChina Jilin Oilfield Company,Songyuan 138000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]中海石油(中国)有限公司深圳分公司研究院,深圳南山518000 [3]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000 [4]中国石油吉林油田公司勘探开发研究院,吉林松原138000

出　　处：《石油勘探与开发》2022年第3期530-537,共8页Petroleum Exploration and Development

基　　金：国家自然科学基金项目“超低渗透油藏CO_(2)强化采油过程中多孔介质相态及微观渗流机理研究”(51974268);四川省科技计划项目“特低渗透油藏CO_(2)驱微观渗流理论及影响机制研究”(2019YJ0423)。

摘　　要：基于童氏图版,考虑油、气、水三相的影响,提出以累计产气、产水量地下体积之和占总产出流体地下体积比例的含水气率替代含水率,将累计产气量纳入童氏水驱特征曲线图版中,推导了气驱特征曲线方程,建立了一种适用于气驱油藏采收率预测的新型图版,同时采用油田实际生产数据,结合油藏数值模拟预测数据,论证了新型图版的适用范围并用实例验证了预测结果的精度。结果表明,新型图版同时适用于水驱、气驱油藏采收率预测。当油藏不注气或未产气时,可忽略气相,仅考虑油、水两相,新型气驱特征曲线图版退化为童氏图版,可评价油藏水驱效果。当气驱油藏含水气率为60%~80%时,新型图版回归法预测采收率适用性较好。当气驱油藏含水气率大于80%时,新型图版回归法与赋值法均可较准确地预测气驱油藏最终采收率。A novel type curve is presented for oil recovery factor prediction suitable for gas flooding by innovatively introducing the equivalent water-gas cut to replace the water cut,comprehensively considering the impact of three-phase flow(oil,gas,water),and deriving the theoretical equations of gas flooding type curve based on Tong’s type curve.The equivalent water-gas cut is the ratio of the cumulative underground volume of gas and water production to the total underground volume of produced fluids.Field production data and the numerical simulation results are used to demonstrate the feasibility of the new type curve and verify the accuracy of the prediction results with field cases.The new type curve is suitable for oil recovery factor prediction of both water flooding and gas flooding.When a reservoir has no gas injected or produced,the gas phase can be ignored and only the oil and water phases need to be considered,in this case,this gas flooding type curve returns to the Tong’s type curve,which can evaluate the oil recovery factor of water flooding.For reservoirs with equivalent water-gas cuts of 60%-80%,the regression method of the new type curve works well in predicting the oil recovery factor.For reservoirs with equivalent water-gas cuts higher than 80%,both the regression and assignment methods of the new type curve can accurately predict the oil recovery factor of gas flooding.

关 键 词：气驱油藏 含水气率 气驱特征曲线 采收率 预测图版 童氏图版 

分 类 号：TE345[石油与天然气工程—油气田开发工程]