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Developing schemes of field benches for tests of submersible pumps at liquid and gas delivering

UDK: 622.276
DOI: 10.24887/0028-2448-2018-7-96-99
Key words: submersible pump, field bench, gas-liquid mixture, well operation
Authors: A.N. Drozdov (Gubkin Russian State University of Oil and Gas (National Research University), RF, Moscow)

The operation of submersible centrifugal pumps is currently the main method of oil production in Russia. Most wells equipped with submersible pumps are operated at inlet pressures, lower saturation pressures, and a mixture of liquid and gas enters the pump. Increasing of submersible pumps efficiency when pumping liquid and gas is one of the important areas of research in artificial lift methods.

When developing new types of submersible equipment for efficient pumping of gas-liquid mixtures, bench tests of the characteristics of experimental pump samples are necessary. For a more complete approximation to real operating conditions, it is advisable to use field benches with the possibility of investigating the characteristics of pumps when pumping out well production. Therefore, an important practical task is the development of schematic diagrams of field benches that provide adequate modeling of well conditions when pumping liquid and gas by submersible pumps.

In this paper, two schemes of benches are presented. One of the proposed basic hydraulic circuits involves placing an experimental pump sample on the surface of the earth near the wellhead of the production well. This bench can be made in the mobile version and move if necessary from one well to another. For testing, it is advisable to sel ect wells with different water cuttings of the liquid. In another developed schematic diagram, a field test bench for testing the characteristics of pumps is located on a preliminary water discharge facility. It is also possible to carry out tests on a field bench with regulation of not only gas content but also water cut.

It is shown that the problem of pump operation in wells and testing on field benches at high gas contents is relevant not only for the oil industry, but also for the gas industry. In the process of watering the gas deposits, a mechanism of water-alternated-gas effect (WAG) can be manifested as the main factor for extracting a part of condensate deposited in the reservoir. Therefore, the mechanized operation of watered gas condensate wells with submersible pumps will make it possible to realize WAG in the formation, not only with an increase in gas production, but also with an increase in the condensate recovery of reservoirs.

References

1. Drozdov A.N., Influence of free gas on submerged pumps characteristics (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2003, no. 1, pp. 68–70.

2. Drozdov A.N., Wells operation technologies with submersible pumps at low bottom-hole pressures (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2003, no. 6, pp. 86–89.

3. Drozdov A.N., Tekhnologiya i tekhnika dobychi nefti pogruzhnymi nasosami v oslozhnennykh usloviyakh (The technology and technique of oil production by submergible pumps in the complicated conditions), Moscow: MAKS press Publ., 2008, 312 p.

4. Lyapkov P.D., Drozdov A.N., The change in saturation pressure and the degassing curve of the reservoir oil due to partial gas separation at the entrance to the ESP (In Russ.), Neftepromyslovoe delo, 1987, no. 6, pp. 4–7.

5. Mokhov M.A., Sazonov Yu.A., Dimaev T.N., Technical equipment and technology for production and transfer of hydrocarbons (In Russ.), Neft', gaz i biznes, 2013, no. 7, pp. 66-68.

6. Sazonov Yu.A., Mokhov M.A., Klimenko K.I., Demidov A.V., Pump systems modeling for oil production (In Russ.), Neft', gaz i biznes, 2013, no. 9, pp. 54–56.

7. Mokhov M.A., Sazonov Yu.A., Mulenko V.V., Pump system modeling (In Russ.), Neft', gaz i biznes, 2013, no. 11, pp. 66–68.

8. Mokhov M.A., Sazonov Yu.A., Dimaev T.N., Gryaznova I.V., New technical solutions in the development of pumping systems for multiphase flow lifting (In Russ.), Gazovaya promyshlennost' = GAS Industry of Russia, 2013, no. 7, pp. 54–55.

9. Verbitskiy V.S., Drozdov A.N., Den'gaev A.V., Rabinovich A.I., New technology of the electrocentrifugal pump unit protection from harmful effect of mechanical impurities (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2007, no. 12, pp. 78–81.

10. Drozdov A.N., Terikov B.A., Application of submerged jet pumps systems with dual-string lift for the sticky holes operation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009, no. 6, pp. 68–72.

11. Orlov D.G., Terikov V.A., Drozdov A.N. et al., Field testing of experimental samples of the packerless hydraulic jet pump arrangement with a double-lift tubing in the Samotlor field (In Russ.), Neftepromyslovoe delo, 2003, no. 11, pp. 20–24.

12. Drozdov A.N., Operation of low-pressure gas and gas-condensate wells by artificial liftВ  methods (In Russ.), Gazovaya promyshlennost', 2010, no. 13, pp. 63–67.

13. Drozdov A.N., Egorov Yu.A., Telkov V.P. et al., Technology and technique of SWAG injection impact on oil reservoirs (In Russ.), Territoriya NEFTEGAZ, 2006, no. 2, pp. 54–59.

14. Drozdov A.N., Drozdov N.A., Laboratory researches of the heavy oil displacement fr om the Russkoye field’s core models at the SWAG injection and development of technological schemes of pump-ejecting systems for the water-gas mixtures delivering, SPE 157819, 2012.

15. Burakov Yu.G., Ulyashev V.E., Guzhov N.A., Analysis of the efficiency and mechanism of the WAG effect on the condensate deposited in the formation (In Russ.), Gazovaya promyshlennost', 1991, no. 7, pp. 29–30.

The operation of submersible centrifugal pumps is currently the main method of oil production in Russia. Most wells equipped with submersible pumps are operated at inlet pressures, lower saturation pressures, and a mixture of liquid and gas enters the pump. Increasing of submersible pumps efficiency when pumping liquid and gas is one of the important areas of research in artificial lift methods.

When developing new types of submersible equipment for efficient pumping of gas-liquid mixtures, bench tests of the characteristics of experimental pump samples are necessary. For a more complete approximation to real operating conditions, it is advisable to use field benches with the possibility of investigating the characteristics of pumps when pumping out well production. Therefore, an important practical task is the development of schematic diagrams of field benches that provide adequate modeling of well conditions when pumping liquid and gas by submersible pumps.

In this paper, two schemes of benches are presented. One of the proposed basic hydraulic circuits involves placing an experimental pump sample on the surface of the earth near the wellhead of the production well. This bench can be made in the mobile version and move if necessary from one well to another. For testing, it is advisable to sel ect wells with different water cuttings of the liquid. In another developed schematic diagram, a field test bench for testing the characteristics of pumps is located on a preliminary water discharge facility. It is also possible to carry out tests on a field bench with regulation of not only gas content but also water cut.

It is shown that the problem of pump operation in wells and testing on field benches at high gas contents is relevant not only for the oil industry, but also for the gas industry. In the process of watering the gas deposits, a mechanism of water-alternated-gas effect (WAG) can be manifested as the main factor for extracting a part of condensate deposited in the reservoir. Therefore, the mechanized operation of watered gas condensate wells with submersible pumps will make it possible to realize WAG in the formation, not only with an increase in gas production, but also with an increase in the condensate recovery of reservoirs.

References

1. Drozdov A.N., Influence of free gas on submerged pumps characteristics (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2003, no. 1, pp. 68–70.

2. Drozdov A.N., Wells operation technologies with submersible pumps at low bottom-hole pressures (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2003, no. 6, pp. 86–89.

3. Drozdov A.N., Tekhnologiya i tekhnika dobychi nefti pogruzhnymi nasosami v oslozhnennykh usloviyakh (The technology and technique of oil production by submergible pumps in the complicated conditions), Moscow: MAKS press Publ., 2008, 312 p.

4. Lyapkov P.D., Drozdov A.N., The change in saturation pressure and the degassing curve of the reservoir oil due to partial gas separation at the entrance to the ESP (In Russ.), Neftepromyslovoe delo, 1987, no. 6, pp. 4–7.

5. Mokhov M.A., Sazonov Yu.A., Dimaev T.N., Technical equipment and technology for production and transfer of hydrocarbons (In Russ.), Neft', gaz i biznes, 2013, no. 7, pp. 66-68.

6. Sazonov Yu.A., Mokhov M.A., Klimenko K.I., Demidov A.V., Pump systems modeling for oil production (In Russ.), Neft', gaz i biznes, 2013, no. 9, pp. 54–56.

7. Mokhov M.A., Sazonov Yu.A., Mulenko V.V., Pump system modeling (In Russ.), Neft', gaz i biznes, 2013, no. 11, pp. 66–68.

8. Mokhov M.A., Sazonov Yu.A., Dimaev T.N., Gryaznova I.V., New technical solutions in the development of pumping systems for multiphase flow lifting (In Russ.), Gazovaya promyshlennost' = GAS Industry of Russia, 2013, no. 7, pp. 54–55.

9. Verbitskiy V.S., Drozdov A.N., Den'gaev A.V., Rabinovich A.I., New technology of the electrocentrifugal pump unit protection from harmful effect of mechanical impurities (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2007, no. 12, pp. 78–81.

10. Drozdov A.N., Terikov B.A., Application of submerged jet pumps systems with dual-string lift for the sticky holes operation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009, no. 6, pp. 68–72.

11. Orlov D.G., Terikov V.A., Drozdov A.N. et al., Field testing of experimental samples of the packerless hydraulic jet pump arrangement with a double-lift tubing in the Samotlor field (In Russ.), Neftepromyslovoe delo, 2003, no. 11, pp. 20–24.

12. Drozdov A.N., Operation of low-pressure gas and gas-condensate wells by artificial liftВ  methods (In Russ.), Gazovaya promyshlennost', 2010, no. 13, pp. 63–67.

13. Drozdov A.N., Egorov Yu.A., Telkov V.P. et al., Technology and technique of SWAG injection impact on oil reservoirs (In Russ.), Territoriya NEFTEGAZ, 2006, no. 2, pp. 54–59.

14. Drozdov A.N., Drozdov N.A., Laboratory researches of the heavy oil displacement fr om the Russkoye field’s core models at the SWAG injection and development of technological schemes of pump-ejecting systems for the water-gas mixtures delivering, SPE 157819, 2012.

15. Burakov Yu.G., Ulyashev V.E., Guzhov N.A., Analysis of the efficiency and mechanism of the WAG effect on the condensate deposited in the formation (In Russ.), Gazovaya promyshlennost', 1991, no. 7, pp. 29–30.



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