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低渗透油藏CO2驱气窜通道识别方法
引用本文:张世明. 低渗透油藏CO2驱气窜通道识别方法[J]. 油气地质与采收率, 2020, 27(1): 101-106
作者姓名:张世明
作者单位:中国石化胜利油田分公司勘探开发研究院,山东东营257015
基金项目:中国石化重大示范工程“胜利油田低渗透油藏CO2驱开发技术研究及示范应用”之子课题“示范区跟踪调控与综合评价研究”(P18088-6)。
摘    要:低渗透油藏CO2驱开发过程中,面临的最大问题是容易发生气窜。针对目前尚无定量的气窜识别标准,以及现有的气窜通道体积计算方法实用性较差等问题,通过分析产出气中CO2含量的动态变化特征,将气窜类型划分为明显气窜和微弱气窜两大类,明确了见气时间确定方法,建立了气窜识别判断标准。在此基础上,利用物质守恒原理分别计算注入端和产出端的气窜通道体积,并借助气窜通道体积交会图实现对气窜通道体积的校正,从而消除单井产液比例系数或井网形状因子对气窜通道体积计算结果的影响。通过对实际气窜单井的分析和计算表明,该方法具有较强的操作性和实用性,一方面实现了对气窜类型和气窜程度的定性评价,另一方面实现了对气窜通道体积和气窜通道横截面积的定量计算,为后期合理设计封堵措施和堵剂用量提供理论依据。

关 键 词:低渗透油藏  CO2驱  气窜判断标准  气窜通道体积  识别方法

Study on identification method for gas channeling of CO2 flooding in low permeability reservoirs
ZHANG Shiming. Study on identification method for gas channeling of CO2 flooding in low permeability reservoirs[J]. Petroleum Geology and Recovery Efficiency, 2020, 27(1): 101-106
Authors:ZHANG Shiming
Affiliation:(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China)
Abstract:During the development of CO2 flooding in low permeability reservoirs,the most serious problem is gas channeling. At present,there are no quantitative gas channeling identification standards,and the existing calculation methods of gas channeling volume are not practical. The dynamic variation characteristics of CO2 content in the produced gas are analyzed,and the types of gas channeling are divided into the obvious gas channeling and the weak gas channeling. The calculation method of gas breakthrough time is determined,and the identification and evaluation criteria for gas channeling are established. On this basis,gas channel volumes from the injection side and the production side are calculated respectively by using the principle of material conservation. In order to eliminate the influence of single well fluid production ratio or pattern shape factor on the gas channel volume,the gas channel volume is corrected by the gas channel volume intersection diagram. The calculation method of gas channel volume has strong operability and practicability according to the results of gas channeling wells in a tight reservoir. On one hand,this method realizes the qualitative evaluation on gas channeling type and gas channeling degree. On the other hand,this method realizes the quantitative calculation of gas channeling volume and gas channeling horizontal area. It can provide theoretical basis for reasonable design of plugging measures and dosage of plugging agent in the later development stage.
Keywords:low permeability reservoirs  CO2 flooding  gas channeling evaluation standard  gas channeling volume  identification method
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