摘要
方法利用侧钻井，对原井或邻井进行采油动态的测井监测，分析影响水淹状况的因素，确定各类稠油层的剩余油饱和度。目的分析稠油层动用程度，为老井的调层采油提供理论依据。结果在油层物性相似条件下，油层的水淹状况与注汽井段位置、油层厚度有关。强水淹层多形成在注汽井段的上部和中部、油层厚度大于3m的1类层；中水淹层多形成在注汽井段的上部和中部、油层厚度大于1m的Ⅰ类层和Ⅱ类层；其它层段易形成弱水淹。结论以电阻减小率为主，综合解释蒸汽吞吐水淹层是可行的，估算的剩余油饱和度误差较小；根据原始含油饱和度、孔隙度、油层厚度、注汽井段位置，结合采油动态，可以解释老井的水淹状况。
Method Through log monitoring of oil production performance of the original or adjacent well in sidetracking well, the influence factors of watered-out are analyzed and the remaining oil saturation is determined for each type of heavy oil reservoirs. Purpose To provide theoretical basis for formation adjustment and oil production in old wells through analyzing the producing degree of heavy oil formation. Result Under the same physical properties, reservoir watered-out state relates to the position of steam injection interval and reservoir thickness. Serious watered-out reservoirs usually form in the upper and middle parts ofthe steam injection intervals which are thicker than 3 m and belong to reservoir type Ⅰ.Middle watered-out reservoirs usually form in the upper and middle parts of the steam injection intervals which are thicker than 1 m and belong to reservoir type Ⅰ and Ⅱ. Other formations are apt to form weak watered-out zones. Conclusion Taking the resistance reducing rate as a main factor, it is feasible to comprehensively interpret watered-out formationcaused by steam soak, and the error of evaluated remaining oil saturation is less. The watered-out state of old wells can be interpreted according to initial oil saturation, porosity,reservoir thickness, and position of steam injection interval, also combining with productionperformance.
出处
《特种油气藏》
CAS
CSCD
1997年第4期27-31,共5页
Special Oil & Gas Reservoirs
关键词
蒸汽吞吐
水淹
测井解释
稠油田开发
steam soaking, watered out，remaining oil saturation, log interpretation, block Jin 45
