对于某一特定尺寸的节流管线，第一循环周及第二循环周的最大流量随着水深的增加而增加；
When size of choke line is not variable, the first and second circulation rate increases with well depth increasing.
附加流速法通过向节流管线内注入轻质的附加流体降低了节流管线的压降，可以很好的解决上述的压井难题。
Additional flow rate (AFR) method can overcome this problem beautifully by inject a kind of light and thin fluid into choke line to drop its pressure loss.
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