Study On The Production Capacity Evaluation Of Super-heavy Oil Horizontal Well

Venezuela's ultra-heavy oil reservoirs are characterized by high viscosity and strong heterogeneity,and they are mostly exploited by natural energy depletion.Under high-viscosity conditions,Venezuela's ultra-heavy oil reservoirs have characteristics different from those of conventional heavy oils.There are foam oil flow stages in actual production,and the viscosity,formation pressure,and formation permeability of crude oil in the direction of wellbore are currently changed in the calculation model of the excess oil production capacity.The effect of the effective length of the wellbore on production capacity has not yet been clarified.Blocks A and B are typical overweight oil reservoirs in Venezuela's super heavy oil blocks.The features of geological fluids in the two blocks are quite different,and the characteristics of overweight production are different under different fluid characteristics and reservoir characteristics.This article first summarizes the main control factors affecting the development effect by analyzing the production dynamics of Block A and Block B.Secondly,the coupled model of extra-heavy oil reservoir under the influence of crude oil viscosity,formation pressure,horizontal well length and formation permeability was established,and the iterative method was used to calculate the flow and pressure distribution of the over-heavy oil reservoir.Then the simulation block was written by Matlab to calculate the oil production capacity and the effective length of the horizontal well under the condition of pressure variation under horizontal heterogeneity along the horizontal well.Finally,the single variable method was used to analyze the influence of formation permeability,crude oil viscosity,and effective length of horizontal wells on the horizontal well cold recovery of ultra-heavy oil.Based on the results of calculation and analysis,effective measures for the actual production of the oil field blocks were proposed.The results of this study have important implications for recognizing the cold production capacity of horizontal wells in Venezuela and the follow-up improvement measures that are effective in prolonging the production phase of foam oil flow.