Study On The Production Capacity Of Radial Multi - Branch Well Under The Completion Mode Of Underground

Radial multi-branch horizontal wells (namely radial multi-branch wells) could improve the productivity of single well when exploiting multiple small lumps or lens reservoir, thin layer reservoir, low pressure and low permeability reservoir and high viscosity heavy oil reservoir. Compared to the conventional horizontal wells, it can both enhance the final productivity radial multi-branch wells and save the cost of investment. It has important guidance for the development of this kind of oil and gas reservoir in the future. Based on previous research, a study was conducted aiming at the productivity model of radial multi-branch wells with open-hole completion, major progress and results are:(1)Considering factors of seepage interference, well bore pressure drop, drilling and completion contamination, associated with flow mechanics theory, hydromechanics theory, reservoir engineering theory and numerical analysis theory, using the discrete approach,a new steady-state productivity coupling model was developed.(2) Compared to the traditional models, the advantages of this model are:considering the influence of completion contamination and completion method to the productivity of radial multi-branch wells. It is able to simulate thin layer and analysis the influence factors of the radial multi-branch wells.(3)A cycle iterativesolver of the steady-state coupling model was developed, and the corresponding "radial multi-branch wells productivity calculation program" was developed. The example was calculated by program branch wellbore radial flow, axial flow and wellbore flow pressure data, drawing the corresponding data distribution.(4)The results show that the interference of reservoir seepage was great to reservoir seepage and the well bore friction consumes part of production pressure resulting in lower productivity. The above regular patterns are of practical significance to radial multi-branch wells drilling and completion technology.(5)Based on the results above, a further single variant analysis was conducted. The model for calculating the capacity of the traditional empirical for mula and calculated capacity were compared, the results further validate the correctness of the model.