Through analyzing the effect of the vertical locations of horizontal wells on the critical output and gas breakthrough time of the gas cap reservoir, the curve showing the relationship between the vertical locations of horizontal wells and the critical output as well as the gas breakthrough time is obtained in t.

The bottom water coning model used by Boyun Guo considered the influence of perforation length on critical output, so it can be used to calculate the perforation length of bottom water reservoir.

The paper has discussed the effect of vertical locations of horizontal wells on the critical output and producing pure oil time,analyzed the ratio .

The research and application of critical production model of fractures sand entry in fracturing gas well;

Then, the factors affecting production, critical production and water breakthrough time is studied an.

In order to determine the suitable commissioning production, the critical production of bottom water coning must be studied.

Calculation method of critical production rate for fractured-vuggy reservoir with bottom water

In 1993, a formula for critical production rate of oil well in bottom water reservoir with partition board was proposed by Dr.

On the basis of this theoretic model, the critical production rate, the shape of water coning and the optimum perforation intervals could .

Aiming at the issue of correcting coefficient in gas well critical liquid-carrying rate calculation equation for gas liquid ration greater than 1400m3,on the basis of the liquid drop being flat-shaped in gas well bore and the relationship of drag coefficient and Reynolds number (between 1×103～2.