随着牛74块开发程度的不断提高，滚动扩边的难度越来越大。
With the increasing of development degree of Block Niu 74, it is getting more and more difficult to expand the reserves exploitation.
该方法为老区扩边提供了新的开发井位，显示了良好的应用前景。
This method can provide new developed well location for extending border in old region.
可选装预扩幅、归中等部件，适用于卷边的织物。
Pre-spreading part and centering device are optional parts, suit for edge curling fabrics.
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