Many researchers find that when IPRs of a vertical well are used in a horizontal well, the results are not satisfactory. To be exact, the exponent type of IPR can not reasonably match the late part of the observed curve, while the binomial equation can not match the early stage of the curve very well. Bendakhlia et al1  combined the two equations into an equation, and applied it to describe the IPR of a horizontal well. They thought that the composite equation can better be used in a horizontal well, and verified the conclusion by means of numerical simulation results. However, the equation is only valid to an ideal well (a well without any negative or positive skin factor).

Considering Bendakhlia's work, the authors introduce a flowing efficiency R to establish a new IPR for horizontal wells so as to broaden its application. The new equation is suitable to both ideal wells and actual wells (damaged or stimulated wells). Moreover, this paper presents the solution technique to obtain unknown parameters in the formula for dimensionless IPR curves of a horizontal well according to steady well testing data. Several examples have shown that the new IPR equation can give satisfactory performance prediction results of horizontal wells. Its prediction accuracy is higher than that of the IPR developed by Bendakhlia et al. The relative errors of oil flow rates in an example are within 1.5%.

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