Different Level Of Completion Method Well Productivity Evaluation Research

In recent years, the feathered development of horizontal well drilling and completion technique have played an important role in oil and gas field exploration and development, and also have a remarkably advantage in enhancing recovery. Currently, the horizontal well as an important development technology to improve gas well productivity, its advantage that conventional vertical well can not be compared. Horizontal gas well productivity prediction research is an important part of design and development programs; provide a basis for determine reasonable gas production method,optimization of the parameters and stimulation design. Therefore, study on horizontal gas well deliverability of different completion method have great significance.In this paper, through a lot of literature research, mainly on the following aspects were studied:(1) Analyze the advantages and disadvantages, the adaptive geologic condition of each completion method of horizontal gas well;(2) On the basis of the existing proceed expand and improve, established horizontal gas well binomial deliverability equation of consider the effect of high-speed non-Darcy and start pressure gradient, and analyze the effect for horizontal gas well deliverability of pressure gradient,non-Darcy effects,horizontal length,anisotropy,formation thickness,supply radius and other parameters;(3) According to the decomposition calculate equation of skin factor, establish deliverability forecast model of open-hole completion, slotted liner completion, open-hole gravel packing completion and perforated completion, and analysis the impact of parameters on productivity;(4) Based on the theory of gas seepage, derive the stability deliverability equation expression in horizontal gas well of composite reservoir, and analyze the permeability ratio inside and outside the zone,the inner radius on the impact of inflow performance relationship and open-flow potential.Through theoretical analysis and formula above, study on horizontal gas well deliverability of different completion method and influence factors, provide a fundamental basis for completion techniques and completion optimization, provide a reliable prediction method for the future completion production of horizontal gas well.