Study of thermal and filtration capacity properties of reservoir rocks of ultra-viscous oil deposits
Topicality of the research: Thermal properties of rocks: specific heat capacity, thermal conductivity and thermal conductivity coefficients determine the nature of natural and artificial temperature fields in the subsurface. These parameters should be taken into account in thermal influence on the reservoir and solving thermodynamic issues related to prediction of fluid temperature at the mouth of producing wells, evaluation of reservoir filtration parameters, thermal treatment of productive horizons, etc. Research objective: to determine the dependence of the coefficient of thermal conductivity, specific heat capacity, thermal conductivity of reservoirs of extra-viscous oil (EVO) deposits of Urmyshlinskoye field of Tatneft PJSC on the temperature and filtration-volume properties. The object of the research: reservoirs of UHF deposits - fine-grained, uniformly bituminous sandstones. Research methods: commercially available laboratory instruments were used to solve the task. Temperature conductivity was studied with the LFA 467 instrument based on the laser flash method according to international standards ASTM E-1461, DIM EN 821 and DIN 30905. It uses an infrared detector to measure the temperature increase on the back side of the sample as a function of time. A DSC 204 HP differential scanning calorimeter was used to determine the specific heat capacity. This instrument measures heat fluxes from the temperature difference at two points on the measuring system at the same point in time. Determinations can be made both in isothermal conditions and in dynamic mode with a programmable change in the temperature of the shell (heater) (calorimeters of this type are called "scanning"). Research results. The thermal diffusivity, specific heat capacity, and thermal conductivity were determined, and the dependence of thermal properties of rocks on temperature and filtration-capacitative properties was revealed.