摘要
克拉玛依油田六中区油藏埋藏浅，油层厚度大，连通性好。该油藏原油粘度大且非均质性严重，注水驱油效率低，注水开发二十多年，采出程度仅为１６．５％，综合含水超过７６％。利用新技术改善这类油藏的开发效果存在巨大潜力。利用一维模型研究了水驱后油藏转热采的可行性，物理模拟实验结果表明：水驱后转注热水驱效果较差，残余油饱和度达２８％左右；而转蒸汽驱效果较好，残余油饱和度为１０％左右，且水驱后含油饱和度和热采时的残余油饱和度无关。数值模拟是在物理模拟结果的基础上进行的，研究表明：水驱后油藏转注蒸汽开采有利的油藏条件是水驱后油藏转注蒸汽开采的油层净总厚度比大于０．５，油层厚度大于１０ｍ，含油饱和度大于５０％，油层孔隙度大于０．２，渗透率变异系数小于０．７５且油层呈正韵律。
iddle District NO.6 of Karamay oil field is a shallow, large and thick
conglomerate reservoir with good connectivity. Due to the high oil viscosity and strong
reservoir heterogeneity, the effectiveness of water injection is rather low. After 20 years of
waterflooding 16.5% OOIP has been recovered. The overall water cut is over 76%. Ultimate
recovery can not reach over 25% OOIP. Therefore, applying new technology to enhance oil
recovery from this reservoir holds great potential. Doubtless, thermal recovery is becoming
available. A feasibility study of thermal recovery reservoirs after waterflood with one
dimensional model has been made. Experimental results shown that in the Middle District No.6
converting the waterflood into hot waterflood, effectiveness is rather low; residual oil saturation
is still higher than 28%. However, the effectiveness of steamflood reservoir after water flood is
rather high; residual oil saturation is about 10%, and residual oil saturation of thermal recovery
is basically independent of the oil saturation after waterflood. Based on laboratory results and
Karamay geological characteristics, numerical simulation established a typical basic model,
under steamflooding operating conditions. The study of reservoir conditions for converting to
steamflooding was made. The results show that the good conditions are: oil saturation greater
than 50%, the thickness of reservoir greater than 10m, net/gross thickness ratio more than 0.5,
reservoir porosity higher than 0.2, permeability variation coefficient less 0.75 and positive
rhythm reservoir.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1999年第3期80-83,共4页
Petroleum Exploration and Development
关键词
油田注水
注水后期
油藏转注
可行性
注蒸汽
High water cut stage, Steam flooding, Reservoir physical
property, Physical analog, Numerical simulation, Kelamayi oil field
