低渗透挥发性油藏注烃类气驱室内实验研究

The Experiment Study of Hydrocarbon Gas Injection in Low Permeability Volatile Reservoir

王进安1,曾贤辉1,陈德斌1,梁绍敏2,罗松刚1

Wang Jin’an, Zeng Xianhui, Chen Debin, et al

1.中原油田分公司勘探开发科学研究院,2.中原油田分公司信息中心

Scientific Research Institute of Petroleum Exploration and Development , Zhongyuan Oilfield Company , SINOPEC, Henan 457001 , P. R. China

通过注烃类气驱实验研究,了解文留油田低渗透挥发性油藏注气开发的一般机理和开发特点。采用PVT 分析方法分析地层流体的物理性质、注入溶剂的组份;通过细管实验研究地层流体同注入溶剂在130 ℃时的最小混相压力;长岩心驱替实验分析气驱、水驱、水气交替注气的采收率、压力的变化规律。细管实验研究表明,最小混相压力为47.1 MPa ,长岩心注天然气驱替实验表现出近混相的特征。天然气驱注气压力低,采收率高,适合于文南油田低渗透挥发性油藏。

By the experiment research of hydrocarbon injection , realize the commonly mechanism and exploitation characteristic. By using PVT method analyze physical properties of formation fluid , component of injected solvent . Through slim-tube test study the minimum miscibility pressure of formation fluid and injected solvent in 130℃temperatures. Experiment research of water drive , gas drive and gas-water altermating injection are taken with long core. The slim-tube test indicates that the minimum miscibility pressure . is 47.1 MPa. The gas drive experiment shows that the recovery factor is 65. 7 % when gas make a breakthrough and ultimate recovery factor is 86. 1 % respectively. Water drive test indicates that breakthrough recovery can get to 61. 9 % ,and the recovery factor can get to 64. 5 % when water cut is 98 %. Gas drive alternating injection research indicates that the ultimate recovery factor 95. 22 % , is more 30. 69 % than water drive. Experiment research show that injecting pressure is low and ultimate recovery factor is high , so that hydrocarbon gas drive is fit for low permeability volatile reservoir of Wennan Oilfield.