Due to the complex pore structure and extremely small size in tight reservoirs,there is a high resistance to fluid flow,resulting in low oil well production. The existing conventional water injection development methods are no longer sufficient to meet the development needs of tight oil reservoirs. In light of these challenges,gas injection for oil recovery emerges as a promising technique,particularly for the development of tight oil reservoirs. The minimum miscibility pressure stands as a pivotal parameter in determining the miscibility of oil and gas,thereby playing a critical role in the selection of gas injection strategies. Therefore,accurately measuring and effectively reducing the minimum miscibility pressure has become a focal point of current research. The methodologies for determining the minimum miscibility pressure(MMP) in tight oil reservoirs were meticulously summarized and the factors were analyzed that influence it. The experimental methods include the slim tube test,core displacement method,bubble rise apparatus,and vanishing interfacial tension method. The theoretical methods encompassed empirical correlation methods,equations of state,artificial intelligence techniques,and tie-line analysis methods. By comparing the advantages and limitations of these various methods,the aim is to provide a reference for the accurate calculation of the minimum miscibility pressure in gas injection,thereby promoting advancements in oil reservoir development technology and enhancing the efficiency of oil extraction.
SHI Yu, CHEN Si-meng, HE Fan-chen, LI Hui-yang, YANG Tong, WANG Kang-zhuo.
Progress on Minimum Miscibility Pressure Determination for CO2 Flooding in Tight Reservoirs[J].
Science Technology and Engineering, 2026, 26(4): 1315-1327 DOI:10.12404/j.issn.1671-1815.2501420
在机器学习领域,多种预测模型被应用于预测原油-CO2的最小混相压力,Shokrollahi等[64]提出使用最小二乘支持向量机(least squares support vector machine,LSSVM)模型预测CO2-原油的MMP,结果表明,该模型的预测结果准确性较高,且能够模拟MMP在储层温度、C7+分子量、硫化氢和氮浓度输入参数下的实际物理变化趋势。Huang等[65]将GMDH模型进行改进分别预测纯CO2-原油和非纯CO2-原油的MMP,改进后的GMDH模型能够根据储层温度、注入气体和原油组分确定MMP,通过与实验测量以及经验公式的预测结果比较,改进的数据处理组合方法(group method of data handling,GMDH)模型具有较高的可靠性和准确性。Shakeel等[66]对人工神经网络(artificial neural network,ANN)和自适应神经模糊推理系统(adaptive neuro-fuzzy inference system,ANFIS)改进用于计算MMP,结果表明,ANN模型预测结果优于ANFIS模型,并且该模型可以用于预测新油田的MMP。
部分学者将机器学习和深度学习相结合,优化和加快MMP预测进程,Hadavimoghaddam等[67]结合循环神经网络(recurrent neural network,RNN)、极端梯度提升(extreme gradient boosting,XGBoost)、数据处理组合算法(group method of data handling,GMDH)、CatBoost(categorical boosting)和遗传编程(genetic programming,GP)开发出一种可解释的数据驱动模型用于预测MMP,这种模型能够处理多种输入参数,包括温度、原油和注入流体组分等,与其他方法相比,该模型具有更广泛的适用性。
系线分析法是一种直观计算MMP的方法,通过对油气体系中的系线(Tie-line)进行分析,即,依据系线长度是否为零来确定油气体系是否处于混相状态,实现求解最小混相压力的理论方法。该方法主要可分为特征线(method of characteristics,MOC)法和多混合单元格(method of multiple mixing cells,MMC)法。
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