Research On The Calculation Methods Of The Reasonable Water Injection Allocation Quantity For Conglomerate Reservoirs

How to achieve scientific and rational injection allocation is still a problem. The rate of water injection too large will make the cut rising too fast, easily lead to water channeling, submerging, but the less water injection will make formation energy insufficient and formation pressure decline, So reasonable injection allocation is need. So far, oil field workers has made great achievements in sandstone oil reservoir water injection allocation, builded a lot of calculation methods of water injection, and have been used to guide the production practice, but for the conglomerate reservoir, injection allocation methods are researchedless.Most of the conglomerate reservoirs are low porosity and low permeability reservoirs, and with respect to the sandstone reservoir conglomerate reservoir is more heterogeneity.So for the conglomerate reservoir injection allocation not only need from whole to grasp, butalso pay more attention to the injection allocation of single well differences so as to meet the needs of actual production.This article will address these issues by using these conventional block sandstone injection allocation method to calculatethe injection allocation rate and analysisthe applicability.While establishing BP neural network injection allocation method based on genetic algorithm, split coefficient of the material balance single well injection allocation model and multi-objective optimization injection allocation model. Through the research achieved the following results:(1)Through example calculation shows that the blocks injection allocation model of sandstone reservoir in the paper apply to conglomerate reservoir, andSummarized the applicable range and advantages and disadvantages of all kinds of injection allocation model, provided convenience to quick find out the suitable injection allocation model for later; (2)Based on genetic algorithm,BP neural network injection allocation model have multiple input multiple output of function, and can realize the function from injection allocation to production allocation, has certain superiority;(3)Combines split coefficient method and material balance principle, set up material balance reasonable injection-production ratio calculation equation which based on the split coefficient method to calculate the single well injection allocation, the method overcomes the faults that the split coefficient method alone needs to be given in advance reasonable injection-production ratio when compute. It can compute invalid water injection rate, have certain superiority, the calculation method has been applied in the field; (4)Relative to other single objective optimization model,the multi-objective optimization of injection allocation model not only calculate each injection volume of injection allocation rate of each water injection well, but also can calculate the optimized oil rate and cut rate, the choices of the strategies for guiding water injection more advantages, through calculation Suggests that using the multi-objective optimization of injection allocation model can optimize the injection well injection allocation with the effect of stabilizing oil water control.