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Using of thermal-hydrodynamic methods of layers research in the fields in the Republic of Bashkortostan

UDK: 622.276.5.05.002.56
DOI: 10.24887/0028-2448-2020-1-56-59
Key words: : well test, permanent downhole gauge (PDG), multi-layered object, Joule – Thomson effect
Authors: S.Z. Fatikhov (Bashneft-PETROTEST LLC, RF, Ufa), A.F. Gimaev (RN-BashNIPIneft LLC, RF, Ufa), V.N. Fedorov (Ufa State Petroleum Technological University, RF, Ufa)

The development of multi-layer objects by a single filter leads to the impossibility of regulating the created depression on each layer independently of each other, which necessitates the use of special methods for monitoring energy, production and filtration properties. One of such methods is the use of permanent downhole gauges (PDG), which measure parameters such as pressure, temperature, flow, moisture content in front of each stratum with a string of complex geophysical instruments. High values of water cut and differentiation of reservoir pressures of a multi-layer development facility, which is a characteristic feature of the middle and late stages of development of the Republic of Bashkortostan, lead to a distortion of the recorded parameters. Therefore, special well tests are required to control reservoir pressure, productivity and reservoir development. To determine the individual values of reservoir pressure and the reservoir productivity index of a multi-layered object, an analysis was performed using methods proposed by a number of authors in the middle of the 20th century. To refine the composition of the inflow, a method based on the Joule – Thomson effect is proposed. Similar to the analysis of steady-state studies using an indicator diagram, the Joule – Thomson coefficient was determined from the pressure-temperature plot, constructed from the points obtained when stabilizing the bottomhole pressure and temperature at several steady-state regimes. Application of thermo-hydrodynamic methods of well tests allowed to determine individual values of reservoir pressure, productivity index, hydroconductivity, permeability and skin factor of each of the investigated layers of a multi-layered object.

References

1. Blinov A.F., Diyashev R.N., Issledovanie sovmestno ekspluatiruemykh plastov (Study of the jointly exploited layers), Moscow: Nedra Publ., 1971, 176 p.

2. Diyashev R.N., Mekhanizmy negativnykh posledstviy sovmestnoy razrabotki neftyanykh plastov (Mechanisms of negative consequences of joint development of oil reservoirs), Kazan': Publ. of KSU, 2004, 192 p.

3. Murav'ev V.M., Spravochnik mastera po dobyche nefti (Handbook of the production foreman), Moscow: Nedra Publ., 1975, 264 p.

4. Fatikhov S.Z., Fedorov V.N., Interpretatsiya KVD s uchetom poslepritoka v PO “Sapfir” (Interpretation of pressure build-up curve with allowance for after-flow in the software "Sapphire"), Proceedings of 14th International scientific and technical conference “Monitoring razrabotki neftyanykh i gazovykh mestorozhdeniy: razvedka i dobycha” (Monitoring of development of oil and gas fields: exploration and production), Tomsk: Publ. of TSU, 2015, pp. 56–57.

5. Gimaev A.F., Fatikhov S.Z., Fedorov V.N., Malov A.G., A comprehensive analysis of bottomhole pressure and productivity measurements of the multilayer object in wells equipped with permanent downhole gauge systems (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 6, pp. 76–80.

6. Fatikhov S.Z., Fedorov V.N., Malov A.G., Using permanent downhole gauges at oil fields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 2, pp. 56–59.

7. Mel'nikov S.I., Metodika razdel'nogo promyslovo-geofizicheskogo kontrolya sovmestno ekspluatiruemykh neftyanykh plastov (The method of separate field-geophysical control of jointly exploited oil reservoirs): thesis of candidate of technical science, Moscow, 2015.

8. Chekalyuk E.B., Termodinamika neftyanogo plasta (Thermodynamics of oil reservoir), Moscow: Nedra Publ., 1965.

9. Ramazanov A.Sh., Teoreticheskie osnovy skvazhinnoy termometrii (Theoretical foundations of downhole thermometry), Ufa: Publ. of BashSU, 2017, 112 p., URL: https://elib.bashedu.ru/dl/read/Ramazanov_Teoreticheskie osnovy skvazhinnoj termometrii_up_2017.pdf.

10. Pityuk Yu.A., Davletbaev A.Ya., Musin A.A. et al., Estimation of various temperature effects influencing temperature change near bottomhole formation zone (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2016, no. 1, pp. 28–34.

The development of multi-layer objects by a single filter leads to the impossibility of regulating the created depression on each layer independently of each other, which necessitates the use of special methods for monitoring energy, production and filtration properties. One of such methods is the use of permanent downhole gauges (PDG), which measure parameters such as pressure, temperature, flow, moisture content in front of each stratum with a string of complex geophysical instruments. High values of water cut and differentiation of reservoir pressures of a multi-layer development facility, which is a characteristic feature of the middle and late stages of development of the Republic of Bashkortostan, lead to a distortion of the recorded parameters. Therefore, special well tests are required to control reservoir pressure, productivity and reservoir development. To determine the individual values of reservoir pressure and the reservoir productivity index of a multi-layered object, an analysis was performed using methods proposed by a number of authors in the middle of the 20th century. To refine the composition of the inflow, a method based on the Joule – Thomson effect is proposed. Similar to the analysis of steady-state studies using an indicator diagram, the Joule – Thomson coefficient was determined from the pressure-temperature plot, constructed from the points obtained when stabilizing the bottomhole pressure and temperature at several steady-state regimes. Application of thermo-hydrodynamic methods of well tests allowed to determine individual values of reservoir pressure, productivity index, hydroconductivity, permeability and skin factor of each of the investigated layers of a multi-layered object.

References

1. Blinov A.F., Diyashev R.N., Issledovanie sovmestno ekspluatiruemykh plastov (Study of the jointly exploited layers), Moscow: Nedra Publ., 1971, 176 p.

2. Diyashev R.N., Mekhanizmy negativnykh posledstviy sovmestnoy razrabotki neftyanykh plastov (Mechanisms of negative consequences of joint development of oil reservoirs), Kazan': Publ. of KSU, 2004, 192 p.

3. Murav'ev V.M., Spravochnik mastera po dobyche nefti (Handbook of the production foreman), Moscow: Nedra Publ., 1975, 264 p.

4. Fatikhov S.Z., Fedorov V.N., Interpretatsiya KVD s uchetom poslepritoka v PO “Sapfir” (Interpretation of pressure build-up curve with allowance for after-flow in the software "Sapphire"), Proceedings of 14th International scientific and technical conference “Monitoring razrabotki neftyanykh i gazovykh mestorozhdeniy: razvedka i dobycha” (Monitoring of development of oil and gas fields: exploration and production), Tomsk: Publ. of TSU, 2015, pp. 56–57.

5. Gimaev A.F., Fatikhov S.Z., Fedorov V.N., Malov A.G., A comprehensive analysis of bottomhole pressure and productivity measurements of the multilayer object in wells equipped with permanent downhole gauge systems (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 6, pp. 76–80.

6. Fatikhov S.Z., Fedorov V.N., Malov A.G., Using permanent downhole gauges at oil fields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 2, pp. 56–59.

7. Mel'nikov S.I., Metodika razdel'nogo promyslovo-geofizicheskogo kontrolya sovmestno ekspluatiruemykh neftyanykh plastov (The method of separate field-geophysical control of jointly exploited oil reservoirs): thesis of candidate of technical science, Moscow, 2015.

8. Chekalyuk E.B., Termodinamika neftyanogo plasta (Thermodynamics of oil reservoir), Moscow: Nedra Publ., 1965.

9. Ramazanov A.Sh., Teoreticheskie osnovy skvazhinnoy termometrii (Theoretical foundations of downhole thermometry), Ufa: Publ. of BashSU, 2017, 112 p., URL: https://elib.bashedu.ru/dl/read/Ramazanov_Teoreticheskie osnovy skvazhinnoj termometrii_up_2017.pdf.

10. Pityuk Yu.A., Davletbaev A.Ya., Musin A.A. et al., Estimation of various temperature effects influencing temperature change near bottomhole formation zone (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2016, no. 1, pp. 28–34.


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