seven-spot
seven-spot-
Under the same well space and production conditions , the water breakthrough time of five-spot pattern is longer than that of seven-spot and nine-spot pattern .
相同的井距和生产条件下，五点法井网的见水时间要长于九点法和七点法井网；
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With the increase of angle between the horizontal well and the horizontal direction , the water breakthrough time shortens in five-spot well pattern , firstly increases and then decreases in seven-spot pattern , and increases in nine-spot pattern .
随水平井与水平方向夹角的增大，五点法井网的见水时间缩短，七点法井网的见水时间先增加后缩短，九点法井网的见水时间增加；