Development plans for hard-to-recover hydrocarbon reserves, which include deposits of high-viscosity oils, are of particular relevance for the development of the Russian oil industry. In this regard, there is an increasing interest in thermal methods of production and enhanced oil recovery. The choice of recovery technology and its technological parameters are governed by the effective use of heat, which injected or generated in the formation. It, therefore, depends on the reliability of the initial data on thermal properties, since the thermal conductivity and volumetric heat capacity of the productive formation rocks and host rocks are among the required input data for thermo-hydrodynamic modeling of the production process. However, reliable information on the thermal properties of rocks is usually lacking, while the typical uncertainty in the thermal properties of rocks is significant (reaches hundreds percent and can lead to errors of tens percent in estimated development indicators). This, along with significant spatial and temporal variations in rock thermal properties, necessitates the conduct of appropriate experimental studies for each development object in order to avoid serious errors that are almost inevitable in opposite cases. The entirety of experimental studies of thermal conductivity, specific and volumetric heat capacity of productive formation rocks and host rocks was carried out for the first time on almost a hundred full-size and standard core samples of three wells drilled in Mayorovskoye and Maryinskoye high-viscosity oil fields of the Samara region. The use of an advanced experimental and methodological base made it possible to obtain information on the thermal properties of rocks of formations A3 and B1 that is unique in volume and degree of reliability.
References
1. Romushkevich R., Parshin A., Miklashevskiy D. et al., Experimental investigations of spatial and temporal variations in rock thermal properties as necessary stage in thermal EOR, SPE-165474-MS, 2013, https://doi.org/10.2118/165474-MS.
2. Burger J., Sourieau P., Combarnous M., Thermal methods of oil recovery, Gulf Pub. Co., Book Division. Technology & Engineering, 1985, 430 p.
3. Novikov S.V., Popov Yu.A., Tertychnyy V.V. et al., Opportunities and challenges of modern thermal logging (In Russ.), Geologiya i razvedka, 2008, no. 3, pp. 54–57.
4. Popov Yu.A., Chekhonin E.M., Parshin A.V. et al., New hardware and methodical basis of thermal petrophysics as means to increase the efficiency of heavy oil recovery (In Russ.), Neft'. Gaz. Novatsii. – 2013. – № 13(4). – S. 52–58.
5. Popov Yu., Beardsmore G., Clauser C., Roy S., ISRM Suggested methods for determining thermal properties of rocks from laboratory tests at atmospheric pressure, Rock Mechanics and Rock Engineering, 2016, V. 49 (10), pp. 4179–4207.
6. Chekhonin E.M., Shakirov A.B., Popov E.Yu. et al., Rol' teplofizicheskogo profilirovaniya pri otbore obraztsov kerna neftematerinskikh porod na laboratornye issledovaniya (The role of thermophysical profiling for core sampling for laboratory investigations of source rocks), Proceedings of EAGE/SPE seminar "Science of oil shale: theory and practice", Moscow, 2019, DOI: 10.3997/2214-4609.201900478.
7. ASTM E1530-11, Standard test method for evaluating the resistance to thermal transmission of materials by the guarded heat flow meter technique, West Conshohocken, PA: ASTM International, 2016.
8. Gabova A.V., Popov Y.A., Savelev E.G. et al., Experimental investigation of the effect of temperature on thermal conductivity of organic-rich shales, Journal of Petroleum Science and Engineering., 2020, May, DOI: 10.1016/j.petrol.2020.107438.
9. Registration certificate of measuring instrument no. 56916-14 (2014), Kalorimetry differentsial'nye skaniruyushchie DSC 214 Polyma (Differential scanning calorimeters DSC 214 Polyma).
10. ASTM E1269-11. Standard test method for determining specific heat capacity by differential scanning calorimetry, ASTM International, West Conshohocken, PA, 2011.
11. Popov E.Yu., Romushkevich R.A., Popov Yu.A., Measurements of the rock thermal properties on the standard core plugs as a necessary stage of the thermalphysic investigations of the hydrocarbon fields (In Russ.), Izvestiya vuzov. Geologiya i razvedka, 2017, no. 2, pp. 56–70.
12. Popov E.Yu., Chekhonin E.M., Safonov S.S. et al., Rezul'taty doizucheniya geologicheskogo stroeniya permo-karbonovoy zalezhi Usinskogo mestorozhdeniya putem nepreryvnogo teplofizicheskogo profilirovaniya kerna (Results of additional study of the geological structure of the Permian-Carboniferous reservoir of the Usinskoye field by means of continuous thermophysical core profiling), Proceedings of 12th International Scientific and Practical Conference EAGE “Geomodel' – 2017”, Gelendzhik,, 8-11 September, 2014, URL: http://www.earthdoc.org/ %20publication/publicationdetails/?publication=77923.
13. Wiedemann H.-G., Bayer G., Note on the thermal decomposition of dolomite, Thermochimica Acta, 1987, V. 121, pp. 479–485.
14. Bandi W.R., Krapf G., The effect of CO2 pressure and alkali salt on the mechanism of decomposition of dolomite, Thermochimica Acta, 1976, V. 14 (1–2), pp. 221–243.
