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国外碳酸盐岩油藏防止底水锥进的方法主要有以下几种: 一、在近井底地带造成人工隔挡此法是在底水与油井射孔井段之间打一人工隔挡,限制底水进入井筒。只有当油水界面上升到隔板面时,油井才开始见水。因此采用人工隔挡控制水锥可以延长油井无水采油期,减少产水量,提高油井的开采速度。研究指出,隔挡下面的原油也会釆出来。隔挡下的油和水逐渐上升到隔挡底面后,沿水平方向移到隔挡边部,然后进入井筒被采出来。下表是美国对水锥模拟研究的一口射开度为45％的油井,采出45％的储量所需要的时间:
The methods for preventing bottom water coning in foreign carbonate reservoirs are mainly as follows: 1. Artificial barrier is caused near the bottom of the well. This method is to make a artificial barrier between the bottom water and well perforating well section , Limit the bottom water into the wellbore. Only when the oil-water interface rises to the partition surface, the well began to see the water. Therefore, using artificial barrier to control the water coning can prolong the dry recovery period, reduce the water production and improve the production rate of the well. Research indicates that the crude oil below the baffles will also come out. After the barrier under the oil and water gradually rose to the barrier bottom, along the horizontal direction to the barrier edge, and then into the wellbore is taken out. The table below shows the time required for a 45% shot of a 45% open well in the United States to simulate water cones: