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Identification of the reservoir parts with the bypassed oil on the basis of mathematical simulation and well tests analysis

UDK: 622.276.1/.4.001.57
DOI: 10.24887/0028-2448-2019-10-54-57
Key words: bypassed oil reserves, hydrodynamic simulation, well test analysis
Authors: P.V. Kryganov (Scientific Research Institute of System Development of RAS, RF, Moscow), I.V. Afanaskin (Scientific Research Institute of System Development of RAS, RF, Moscow), S.G. Volpin (Scientific Research Institute of System Development of RAS, RF, Moscow), M.Yu. Ahapkin (Scientific Research Institute of System Development of RAS, RF, Moscow)

Problems of the completeness of oil recovery from the reservoirs in Russia are becoming increasingly relevant. They are largely caused by the complexity of the geological structure of the layers (reservoirs). Filtration heterogeneity of various types during the development of oil field leads to the formation of stagnant or bypassed oil zones, which are practically not produced. In modern development practice, the spatial distribution of oil-saturated areas in developed fields using special studies is far from always determined. Usually, only mathematical simulation is used for solving this problem.

This work is aimed to explore the possibility of identifying the undeveloped oil reserves (bypassed by waterflood) based on wells tests analysis and mathematical simulation, accumulating the results of other types of studies. Two hypothetical models of the part of the oil reservoir were created, differing in geological structure properties - a homogeneous reservoir and a heterogeneous reservoir with zones of the reduced permeability (in which the bypassed zones of the residual oil are then formed during the development). Using these models, the bottom hole pressure changes were calculated for various types of wells tests analysis: the method of pressure buildup and Interference test. The resulting curves were interpreted using the best fit method. The considered integrated approach using mathematical simulation and well test analysis allowed us to confirm the presence of a zone with reduced permeability (assumed by the results of the development analysis) between the studied wells.

Based on the study of a hypothetical field, diagnostic features are formulated to identify the bypassed areas saturated with oil using mathematical modeling and well test analysis. They allow to verify the filtration model and to recommend drilling infill wells or sidetracks to recover the remaining oil reserves.

References

1. Betelin V.B., Yudin V.A., Afanaskin I.V., Sozdanie otechestvennogo termogidrosimulyatora – neobkhodimyy etap osvoeniya netraditsionnykh zalezhey uglevodorodov Rossii (The creation of a domestic thermohydrosimulator is a necessary stage in the development of unconventional hydrocarbon deposits in Russia), Moscow: Publ. of Research Institute for System Studies of the RAS, 2015, 206 p.

2. Surguchev M.L., Zheltov Yu.V., Simkin E.M., Fiziko-khimicheskie mikroprotsessy v neftegazonosnykh plastakh (Physical and chemical microprocesses in the oil and gas reservoirs), Moscow: Nedra Publ., 1984, 215 p.

3. Entov V.M., Pankov V.M., Pan'ko S.V., Matematicheskaya teoriya tselikov ostatochnoy vyazkoplastichnoy nefti (The mathematical theory of the pillars of residual viscoplastic oil), Tomsk: Proceedings of Tomsk University, 1989, 193 р.

4. Mikhaylov N.N., Ostatochnoe neftenasyshchenie razrabatyvaemykh plastov (Residual oil saturation of developed reservoirs), Moscow: Nedra Publ., 1992, 270 p.

5. CMG users guide, Calgary: Computer Modelling Groupe LTD, 2018.

6. Houze O., Viturat D., Fjaere O.S., Dynamic data analysis, Kappa Engineering, 2017, V. 512, 743 p.

7. Kul'pin L.G., Myasnikov Yu.A., Gidrodinamicheskie metody issledovaniya neftegazovodonosnykh plastov (Hydrodynamic study of oil-gas-water-bearing strata), Moscow: Nedra Publ., 1974, 200 p.

8. Earlougher R.C. Jr., Advances in well test analysis, SPE Monograph Series, 1977, V. 5., 264 p.

9. Bourdet D., Well test analysis: The use of advanced interpretation models, Elsevier, 2002, 436 p.

Problems of the completeness of oil recovery from the reservoirs in Russia are becoming increasingly relevant. They are largely caused by the complexity of the geological structure of the layers (reservoirs). Filtration heterogeneity of various types during the development of oil field leads to the formation of stagnant or bypassed oil zones, which are practically not produced. In modern development practice, the spatial distribution of oil-saturated areas in developed fields using special studies is far from always determined. Usually, only mathematical simulation is used for solving this problem.

This work is aimed to explore the possibility of identifying the undeveloped oil reserves (bypassed by waterflood) based on wells tests analysis and mathematical simulation, accumulating the results of other types of studies. Two hypothetical models of the part of the oil reservoir were created, differing in geological structure properties - a homogeneous reservoir and a heterogeneous reservoir with zones of the reduced permeability (in which the bypassed zones of the residual oil are then formed during the development). Using these models, the bottom hole pressure changes were calculated for various types of wells tests analysis: the method of pressure buildup and Interference test. The resulting curves were interpreted using the best fit method. The considered integrated approach using mathematical simulation and well test analysis allowed us to confirm the presence of a zone with reduced permeability (assumed by the results of the development analysis) between the studied wells.

Based on the study of a hypothetical field, diagnostic features are formulated to identify the bypassed areas saturated with oil using mathematical modeling and well test analysis. They allow to verify the filtration model and to recommend drilling infill wells or sidetracks to recover the remaining oil reserves.

References

1. Betelin V.B., Yudin V.A., Afanaskin I.V., Sozdanie otechestvennogo termogidrosimulyatora – neobkhodimyy etap osvoeniya netraditsionnykh zalezhey uglevodorodov Rossii (The creation of a domestic thermohydrosimulator is a necessary stage in the development of unconventional hydrocarbon deposits in Russia), Moscow: Publ. of Research Institute for System Studies of the RAS, 2015, 206 p.

2. Surguchev M.L., Zheltov Yu.V., Simkin E.M., Fiziko-khimicheskie mikroprotsessy v neftegazonosnykh plastakh (Physical and chemical microprocesses in the oil and gas reservoirs), Moscow: Nedra Publ., 1984, 215 p.

3. Entov V.M., Pankov V.M., Pan'ko S.V., Matematicheskaya teoriya tselikov ostatochnoy vyazkoplastichnoy nefti (The mathematical theory of the pillars of residual viscoplastic oil), Tomsk: Proceedings of Tomsk University, 1989, 193 р.

4. Mikhaylov N.N., Ostatochnoe neftenasyshchenie razrabatyvaemykh plastov (Residual oil saturation of developed reservoirs), Moscow: Nedra Publ., 1992, 270 p.

5. CMG users guide, Calgary: Computer Modelling Groupe LTD, 2018.

6. Houze O., Viturat D., Fjaere O.S., Dynamic data analysis, Kappa Engineering, 2017, V. 512, 743 p.

7. Kul'pin L.G., Myasnikov Yu.A., Gidrodinamicheskie metody issledovaniya neftegazovodonosnykh plastov (Hydrodynamic study of oil-gas-water-bearing strata), Moscow: Nedra Publ., 1974, 200 p.

8. Earlougher R.C. Jr., Advances in well test analysis, SPE Monograph Series, 1977, V. 5., 264 p.

9. Bourdet D., Well test analysis: The use of advanced interpretation models, Elsevier, 2002, 436 p.


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