摘要
通过对胜利油区稠油油藏不同原油粘度、不同渗透率、不同温度条件下的岩心进行渗流实验,研究了稠油在多孔介质下的渗流特征和规律。结果表明,稠油在多孔介质下表现为具有一定启动压力梯度的非达西渗流;其中,普通稠油表现为拟塑性渗流特征,特、超稠油表现为膨胀性流体渗流特征。对稠油非达西渗流特征及影响因素进行了研究,提出了计算稠油启动压力梯度的公式。稠油渗流的启动压力梯度受储层渗透率、加热温度、地层原油粘度及沥青质含量影响,储层渗透率越大、油层加热温度越高、原油粘度越低、沥青质含量越低,其启动压力梯度越小。
Based on the laboratory experiment measuring different oil viscosity,permeability and temperatures in heavy oil blocks of Shengli oil field,the flow laws and characters in heavy oil reservoir are investigated.It is found that heavy oil flow is non-Newtonian flow with threshold pressure gradient.The conventional heavy oil is pseudoplastic fluid and extra and super heavy oil is dilatant fluid in porous media.The characters and influential factors of non-Newtonian flow are studied and calculation formula of threshold pressure gradi-ent is derived.The paper presents that threshold pressure gradient is influenced by permeability,temperature,oil viscosity and as-phalt content of heavy oil reservoirs,which decreases with high permeability and temperature and low oil viscosity and asphalt con-tent.The results can be used for heavy oil reservoirs to calculate ultimate drainage radius and thermal well spacing and to determine reasonable development method.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第6期74-77,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石化油气勘探开发工程技术基础性前瞻性研究"稠油热采非达西渗流机理研究"(P08078)
关键词
稠油
启动压力梯度
非达西渗流
泄油半径
胜利油区
heavy oil
threshold pressure gradient
non-Newtonian flow
drainage radius
Shengli oilfield
