Study on hydraulics design of extended reach well

Based on regular method and characteristics of ERW, the distinction of hydraulics design of ERW was analyzed. In view of actual situation, the regular method to calculate theoretical minimum flow rate was modified and the concept of theoretical maximum flow rate was proposed and then more reasonable way to determine the scope of flow rate for optimization was recommended. The influencing factors to circulating pressure loss was analyzed and the precise method to calculate the loss was proposed. On the basis of the above, the hydraulics design of ERW was developed and an example of design was made. The result showed that the new method was more suitable for practice and thus could provide guidance in engineering design.