Due to factors like gravity

laminar flow of oil

gas and water occurs in horizontal wells

which completely differs from the traditional vertical or slant wells.When applied to horizontal wells

the traditional fluid production profile interpretation method often produces errors.Thus it is imminent to create a new interpretation method for horizontal wells

so as to improve its interpretation accuracy and to enhance oil recovery. In this paper

we first analyzed the existing interpretation methods

and then describe the experimental results of horizontal well flow pattern mechanism.Our test data showed that the flow pattern remains constant when the tilt angle and the fluid parameters in each phase of the horizontal wells are the same.Yet a slight change in the inclined angle has great impact on the flow pattern.Therefore

we proposed an equal-tilt-angle interpretation model to calculate the flow rates of each phases in horizontal wells

designed an inversion algorithm

and programmed the model for calculation of fluid production of each layer.Comparative analysis with logging data from 22 wells showed that the error is less than 7.8% for single phase flow interpretation

less than 9.8% for multi phase flow interpretation

and less than 9.68% for total flow interpretation.Experimental results show that this interpretation method can improve the interpretation accuracy of fluid production profile in horizontal wells

and meet the requirements of engineering applications.