Study of the thermal influence on the displacement of high-viscous oil by reservoir water from the Bashkirian core of Akansky field

Abstract

The article discusses the results of physical laboratory modeling of nonisothermal oil displacement by formation water on model composite core samples of the Akansky field, performed on a VINCI CFS-700 filtration unit. In the work, the influence of the permeability of composite core samples on the results of nonisothermal oil displacement by formation water was studied. An analysis of the performed experiments shows that the influence of the temperature regime on the displacement coefficient manifests itself to varying degrees on samples of different permeabilities. The change in the displacement coefficient at various temperature conditions occurs most strongly in low-permeability rock samples, in high-permeability rocks the changes are less significant. Use for displacing produced water with a temperature below the initial formation water (within 2-5ºС) provokes a greater decrease in the displacement coefficient than the use of slightly heated water (within 7ºС). The presence of highly differentiated rock samples by permeability revealed when drilling productive formations significantly complicates the processes of oil displacement. The local highly permeable sections available in the context of productive formations can act as intensifying the process of displacing the zone with the right choice of temperature and exposure technology.

Keywords

• heterogeneity
• laboratory experiment
• formation conditions
• simulation of thermal influence
• core
• displacement coefficient