Dynamic Interference Behaviors of Arbitrary Multilayer Commingling Production in Heavy Oil Reservoirs with Water Flooding

Abstract

To obtain sustainable economical oil production and recovery of investment, some oil fields adopted the strategy of multilayer commingling production at an early stage. This leads to interlayer interference and losing part of the recoverable reserves. In this paper, dynamic interference behaviors of arbitrary multilayer commingling production in heavy oil reservoirs are analyzed. Based on the non-Darcy flow equation, the Buckly–Leverett equation, and the material balance equation, a mathematical model of arbitrary multilayer commingling production is obtained. Oil and water relative permeability, saturation, and bottom hole flow pressure microelement and the iteration method are employed to solve the mathematical model in the time domain. The new model is verified by comparing the results from the typical black oil model using the Darcy law. The sensitivity analysis of critical parameters on interference behaviors, such as permeability, oil viscosity, effective drainage boundary, and voidage replacement ratio, is carried out. The model obtained in this paper can be used for oil and liquid productivity analysis during the overall process of commingling production and extended to be applied in numerical experiments with different combinations of typical parameters as well.

Impact of Crossflow and Two-Phase Flow on Gas Production from Stacked Deposits

“…30 Xu et al derived a mathematical model for oil and water co-production from an arbitrary multilayer. 31 Zhou et al evaluated interlayer interference during the co-production process in an offshore oilfield through a theoretical model considering reservoir heterogeneity and two-phase flow. 32 Chai et al conducted a series of numerical simulations on gas production from multilayer tight sandstone reservoirs and investigated the influence of interlayer interference and production rate.…”

“…Mastbaum et al proposed a method for testing the two-phase flow capacity in two-layer reservoirs in the Laplace domain by analytical solutions of well pressure responses . Xu et al derived a mathematical model for oil and water co-production from an arbitrary multilayer . Zhou et al evaluated interlayer interference during the co-production process in an offshore oilfield through a theoretical model considering reservoir heterogeneity and two-phase flow .…”