Liquid producing capacity optimization method under multiwell interference based on equilibrium displacement

Numerical reservoir simulation and case verification method were adopted to realize the equilibrium displacement under multiwell interference in waterflooding oilfields.It was proposed to take the displacement breakthrough coefficient as the new equilibrium displacement criterion.Actual displacement was divided into four models, i.e., equilibrium in oil and water wells, non-equilibrium in oil well but equilibrium in water well, equilibrium in oil well but non-equilibrium in water well, and non-equilibrium in oil and water wells.An optimization method of rational liquid producing capacity was researched and developed for each model.And equilibrium displacement under multiwall interference was ultimately realized by means of injection and production allocation.It is indicated that it is equilibrium displacement when the displacement breakthrough coefficient is lower than 3 and non-equilibrium displacement when the displacement breakthrough coefficient is higher than 3.When displacement breakthrough coefficient is between 3 and 14, the optimization method of injection and production allocation is in the optimal application range.The research results provide new measures and thoughts for injection and production allocation of oil and water wells.