Simulation of thermal steam treatment of carbonate reservoir on the example of high-viscosity oil fields of Tatarstan

UDK: 622.276.65
DOI: 10.24887/0028-2448-2019-1-50-52
Key words: carbonate reservoir, laboratory stand, thermal steam treatment, gas permeability, oil composition, experimental research
Authors: T.N. Yusupova (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), Yu.M. Ganeeva (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), L.E. Foss (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), E.E. Barskaya (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), A.F. Shageev (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), G.V. Romanov (A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center of RAS, RF, Kazan), O.S. Sotnikov (TatNIPIneft, RF, Bugulma), M.M. Remeev (TatNIPIneft, RF, Bugulma), R.S. Khisamov (Tatneft PJSC, RF, Almetyevsk)

The thermal steam effect (TSE) on oil-saturated carbonate rock with residual water saturation (case study of core material taken from Chernoozerskoe and Pionerskoe oil fields of the Republic of Tatarstan) was simulated using a specially designed laboratory test bench. In advance, in order to study the effect of the mineral composition of the rock on the results of thermal stimulation, thermal oxidation of the Chernoozerskoye and Pionerskoye oils in carbonate rock and quartz sandstone was investigated, and it was shown that the carbonate rock shifted the low-temperature oxidation onset temperature towards higher temperatures, and the process of low-temperature oxidation occurred faster. It was shown that during TSE in the oil-saturated rock the low-temperature oxidation of oil occurred, and a change in the gas relative permeability of rock was detected. It was established that steam with a temperature of 150 °C did not pass through the pore space of a low-permeable carbonate core sample. In increasing steam temperature up to 200–300 °C the vapor began to pass through a core. For a highly permeable carbonate core sample it was determined that an increase of TSE temperature from 200 to 350 °C leaded to an increase in gas relative permeability by 6.8 times.

The oil-displacement efficiency by steam in our experiments performed at a temperature of 250–300 °C was less than 30 %. In light of this, the thermal steam stimulation for the development of heterogeneous carbonate oil reservoirs was not recommended. For development of carbonate reservoir the combination of the TSE method with solvent injection was recommended. It was shown that combination of the TSE with solvent injection could increase the oil-displacement efficiency up to 70 %.

References

1. Muslimov R.Kh., Sovremennye metody povysheniya nefteizvlecheniya: proektirovanie, optimizatsiya i otsenka effektivnosti (Modern methods of enhanced oil recovery: the design, optimization and assessment of efficiency), Kazan': Fen Publ., 2005, 688 p.

2. Melekhin S.V., Mikhaylov N.N., Experimental study of the residual oilmobilization at carbonate reservoirs flooding (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 8, pp. 72–76.

3. Antoniadi D.G., Garushev A.R., Shikhanov V.G., Nastolʹnaya kniga po termicheskim metodam dobychi nefti (Handbook on thermal methods of oil production), Krasnodar: Sovetskaya Kubanʹ Publ., 2000, 464 p.

4. Shihab Mazin Najeeb, Substantiation of thermal effects on carbonate formations with high-viscosity oil of Northern Iraq Qaiyarah oilfield (In Russ.), Neftegazovoe delo, 2011, no. 3, pp. 450–461.

5. Yusupova T.N., Petrova L.M., Mukhametshin R.Z. et al., Distribution and composition of organic matter in oil – and bitumen-containing rocks in deposits of different ages, J. Thermal Analysis and Calorimetry, 1999, V. 55, pp. 99–107.

6. Petrov Al.A., Uglevodorody nefti (Petroleum hydrocarbons), Moscow: Nauka Publ., 1984, 264 p.

The thermal steam effect (TSE) on oil-saturated carbonate rock with residual water saturation (case study of core material taken from Chernoozerskoe and Pionerskoe oil fields of the Republic of Tatarstan) was simulated using a specially designed laboratory test bench. In advance, in order to study the effect of the mineral composition of the rock on the results of thermal stimulation, thermal oxidation of the Chernoozerskoye and Pionerskoye oils in carbonate rock and quartz sandstone was investigated, and it was shown that the carbonate rock shifted the low-temperature oxidation onset temperature towards higher temperatures, and the process of low-temperature oxidation occurred faster. It was shown that during TSE in the oil-saturated rock the low-temperature oxidation of oil occurred, and a change in the gas relative permeability of rock was detected. It was established that steam with a temperature of 150 °C did not pass through the pore space of a low-permeable carbonate core sample. In increasing steam temperature up to 200–300 °C the vapor began to pass through a core. For a highly permeable carbonate core sample it was determined that an increase of TSE temperature from 200 to 350 °C leaded to an increase in gas relative permeability by 6.8 times.

The oil-displacement efficiency by steam in our experiments performed at a temperature of 250–300 °C was less than 30 %. In light of this, the thermal steam stimulation for the development of heterogeneous carbonate oil reservoirs was not recommended. For development of carbonate reservoir the combination of the TSE method with solvent injection was recommended. It was shown that combination of the TSE with solvent injection could increase the oil-displacement efficiency up to 70 %.

References

1. Muslimov R.Kh., Sovremennye metody povysheniya nefteizvlecheniya: proektirovanie, optimizatsiya i otsenka effektivnosti (Modern methods of enhanced oil recovery: the design, optimization and assessment of efficiency), Kazan': Fen Publ., 2005, 688 p.

2. Melekhin S.V., Mikhaylov N.N., Experimental study of the residual oilmobilization at carbonate reservoirs flooding (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 8, pp. 72–76.

3. Antoniadi D.G., Garushev A.R., Shikhanov V.G., Nastolʹnaya kniga po termicheskim metodam dobychi nefti (Handbook on thermal methods of oil production), Krasnodar: Sovetskaya Kubanʹ Publ., 2000, 464 p.

4. Shihab Mazin Najeeb, Substantiation of thermal effects on carbonate formations with high-viscosity oil of Northern Iraq Qaiyarah oilfield (In Russ.), Neftegazovoe delo, 2011, no. 3, pp. 450–461.

5. Yusupova T.N., Petrova L.M., Mukhametshin R.Z. et al., Distribution and composition of organic matter in oil – and bitumen-containing rocks in deposits of different ages, J. Thermal Analysis and Calorimetry, 1999, V. 55, pp. 99–107.

6. Petrov Al.A., Uglevodorody nefti (Petroleum hydrocarbons), Moscow: Nauka Publ., 1984, 264 p.



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