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在注水接近经济极限的两个砂岩油层上进行了提高注水采油效果的试验,而且用取心和测井方法评价注水二次采油后油层的含油饱和度。采用抽提技术测定岩心含油饱和度,而用感应测井确定油层含油饱和度。测井结果与用物质平衡法计算确定的油层含油饱和度值,以及注水试验资料得出的某些饱和度值非常一致。虽然取心和岩心处理都非常小心,但是,从岩心中测得的含油饱和度值总是比测井分析确定的含油饱和度值低。在胶结比较差的岩心中,含油饱和度值偏低,虽然冲洗造成的损失是一个原因,主要原因可能是当岩心从井底取上来时,由于天然气逸散造成的。采用失水量低的泥浆及一种压力型岩心筒进行取心,从取出经过注水的岩心中测定的含油饱和度值要比用一般岩心筒取出的岩心中测定的含油饱和度值准确得多。
Experiments were conducted to improve the effect of injection production on two sandstone reservoirs near the economic limit of injection, and the oil saturation of the reservoir after second injection was evaluated by coring and logging methods. Oil extraction is used to determine the oil saturation of cores, while oil saturation is determined by induction logging. Logging results are in good agreement with some of the saturation values calculated using the material balance method to determine the oil saturation in the reservoir and the water injection test data. Although both cautiousness and core handling are very cautious, the values of oil saturation measured from cores are always lower than the oil saturation values determined by log analysis. In cores with poor cementing, the oil saturation is low, although the loss due to flushing is a cause, perhaps due to natural gas escaping when the core is taken up from the bottom of the well. Centrifuging using a slurry with a low water loss and a pressure core barrel is more accurate than determining the oil saturation values measured in a core removed from a flooded core.