储集层大孔道的识别及调剖技术研究

储层大孔道是在油田长期注水条件下,油层内部形成的高水相流体渗流优势通道。主要表现为三高:高孔隙度、高水相渗透率及高含水饱和度。注采过程中一旦形成大孔道,就会造成注入水长期无效或低效循环,不仅影响了油田可采油的动用程度,而且增加了开发成本。因此,必须加强对大孔道的识别及调剖。目前,大孔道的识别还主要是停留在定性到半定量之间,主要方法有:井间示踪剂方法,通过生产、测井过程中积累的经验值进行判断的方法,以及利用多参数进行综合判断的方法。大孔道的调剖主要是选取与油层相匹配的、价格经济的、堵水效果好的调剖剂,另外,注入方式也很重要。

The Study on Identifying Macropore Path and Water Plugging-Profiling Technoogy

Macropore path are formed by long-time waterflooding in oil exploitation.It is always being featured by three-highness which are high porosity,high permeability and high saturation of water.If macropore path once came into being,the water which was pumped into reservoir would be circling in low effect or even no effect.It not only affects the degree of petroleum which can be extracted,but also increases the cost of exploitation.So we have to enhance the capability of identifying macropore path and use the appropriate water plugging and profiling technology.At present,the methods to identify macropore path are still settled by quality and half-quantity.They are been often used in oil-fields which are inter-well tracer technologies,identification by experience value and the integrate judgement by using many parameters.The most important thing to water-plugging and profiling-modulating is how to chose the appropriate economic agents!which can match macropore formations.And of course,how to pump into wells is also important.