MULTIFUNCTIONAL WELLS: FUNCTIONAL POSSIBILITIES AND SOLVED TASKS

Abstract

Background Over the past quarter century, oil well designs have changed significantly in the direction of increasing the complexity of their spatial trajectory to increase the reservoir coverage with the oil extraction effect. More recently, wells with a double function have appeared: for the injection of a displacing agent and the simultaneous selection of reservoir oil. The article presents the history of the development of multifunctional wells (MFW), considered their attractiveness for the production of high-viscosity oil (HVO). The organization of plane-parallel filtration of high-viscosity oil between two shafts of the MFW is advantageous in that not only the water injection zone, but also the oil extraction zone is characterized by high temperature and low oil viscosity. For the technology of stimulation of gravity drainage by steam injection, calculations of the HVO reservoir development indicators for various parameters of the well grid were carried out, the results were analyzed to determine the optimal distance between the horizontal shafts of multifunctional wells. Aims and Objectives: o determination of the optimal distance between the production shafts of multi-functional wells used in the implementation of the SAGD technology; o consideration of the possibility of using the multifunctional well section as a heat exchanging device in the process of producing high-viscosity oil. Methods The optimal distance between the horizontal sections of multifunctional wells is defined on the basis of modeling the development of the HVO reservoir using SAGD technology in the ROXAR Tempest MORE hydrodynamic simulator. Results The history of the multifunctional wells creation in the Russian Federation as wells with injection functions of a displacing agent and simultaneous selection of reservoir oil is considered. Simulation of oil production using the SAGD technology allowed to determine the optimal distance value between the horizontal shafts of producing wells. The possibility of using a multifunctional well as a heat exchange device to maintain the mobility of high-viscosity oil at the required level during the ascent to the surface is considered.