低渗透油藏二氧化碳驱同步埋存量计算  

Calculation of Carbon Dioxide Simultaneous Sequestration Potential in Low Permeable Reservoirs

作　　者：王高峰[1] 秦积舜[1] 黄春霞 崔翔宇 WANG Gao-feng;QIN Ji-shun;HUANG Chun-xia;CUI Xiang-yu(State Key Laboratory of EOR·CNPC Research Institute of Petroleum Exploration & Development,Beijing 100083,China;Shaanxi Yanchang Oilfield,Xi'an 710075,China;CNPC Research Institute of safety & Environment Technology,Beijing 102206,China)

机构地区：[1]中国石油勘探开发研究院提高石油采收率国家重点实验室,北京100083 [2]陕西延长油田,西安710075 [3]中国石油安全环保研究院,北京102206

出　　处：《科学技术与工程》2019年第27期148-154,共7页Science Technology and Engineering

基　　金：国家重点研发计划(2018YFB0605501);中国石油集团科技专项(2016E-1208);“长庆油田CO2驱油与埋存关键技术研究及应用”(2014E-3606)资助

摘　　要：埋存潜力评价是二氧化碳捕集利用与封存(CCUS)潜力评价的重要内容。在区分二氧化碳驱油项目评价期内的埋存量(同步埋存量)和油藏废弃后的埋存量(深度埋存量)基础上,提出了"三参量法"同步埋存量计算方法;在辨析气驱换油率概念基础上,依据物质平衡原理,考虑压敏效应、溶解膨胀、干层吸气和裂缝疏导等,首次得到二氧化碳换油率理论计算公式;联合油气渗流分流方程、Corey模型和Stone方程等相对渗透率计算公式,给出了自由气相形成的生产气油比确定油藏工程方法;根据气驱增产倍数概念,结合水驱递减规律,预测低渗透油藏气驱产量变化情况。总结提出二氧化碳驱油与埋存项目评价期内埋存量"3步评价法",即"油藏筛选→三参量预测→同步埋存量计算",完善了二氧化碳驱油与埋存潜力评价油藏工程理论方法体系。Calculation of how many carbon dioxide can be sequestrated in the underground oil reservoirs is an important aspect of carbon capture utilization and storage(CCUS)potential evaluation.On the basis of distinguishing the carbon dioxide simultaneous sequestration potential(CSSP)which is the stored volume during the evaluation period of a CO2 flooding project and the effective or deep storage of carbon dioxide after the reservoir being abandoned,the called three-parameter calculation method of CSSP is put forward.By including influencing factors such as pressure sensitive effect of pore space,injected gas dissolution,reservoir fluids expansion,fracture systems flowing,dry layer suction and fluids invasion,the calculation method of the substitution ratio of gas to oil(ratio of carbon dioxide injected to oil produced)was deduced for the first time.Calculation method of the produced gas oil ratio formed by free gas is given by using fractional flowing theory of oil-gas seepage flow,Corey’s relative permeability model of oil and modified stone’s equation for estimation gas relative permeability.The variation of gas flooding in low permeability reservoirs is obtained by employing the concept of"oil production rate multiplier due to gas flooding"combined with the decline law of water flooding.The"three-step evaluation method"of CSSP during the CCUS project evaluation period is advanced:"technical and economic reservoir screening,three-parameter prediction,simultaneous storage calculation".

关 键 词：碳捕集利用与封存 二氧化碳驱 低渗透油藏 同步埋存量 换油率 气油比 气驱增产倍数 

分 类 号：TE357[石油与天然气工程—油气田开发工程]