Well operation using electric centrifugal pumps taking into account geological and physical specifics of the pre-Jurassic Triassic complex

UDK: 622.276.58:551.263
DOI: 10.24887/0028-2448-2021-3-92-94
Key words: the pre-Jurassic Triassic complex, salt depositions, volcanogenic rocks, complicating factors
Authors: A.A. Makeev (Oil and Gas Production Department Bystrinskneft, Surgutneftegas PJSC, RF, Surgut; Industrial University of Tyumen, RF, Tyumen), A.I. Tseplyaeva (Industrial University of Tyumen, RF, Tyumen), S.A. Leontev (Industrial University of Tyumen, RF, Tyumen), E.L. Shay (Oil and Gas Production Department Bystrinskneft, Surgutneftegas PJSC, RF, Surgut)

The article highlights geological and physical features of the pre-Jurassic Triassic complex. Promising targets for prospecting and exploration of oil depositions have been outlined. Consistent patterns associated with reservoir type and dynamic parameters of wells have been identified. Mixed type wells (porous-fractured, porous and fractured) demonstrate a relatively stable production rate. Wells with predominantly fractured reservoir type demonstrate a rapid decline in production. Oil production from wells of the pre-Jurassic complex (the Triassic period) is performed using electrical submersible pumps (ESP). High formation temperature of 116°C, total salt content of about 50 g/l in the produced formation fluid, GOR over 120 m3/m3 are considered as complicating factors for the Triassic target operation. Decrease in the time between failures in the wells of the pre-Jurassic complex (the Triassic period) is caused by the formation of salt residues. Measures were taken to increase the mean time between failures of ESP units. The well stock has been divided into groups; salt hazard categories have been identified for each well group. Criteria for the use of additional ESP units at the salt hazardous well stock of the pre-Jurassic complex (the Triassic period) have been identified. The methodology for the use of an inhibitor for salt depositions has been developed to determine the priority of wells treatment. The saturation index has been defined taking into account the temperature increase in the pump to improve the efficiency of forecasting salt depositions formation in wells of the pre-Jurassic Triassic complex. The methodologies applied to the wells of the pre-Jurassic complex (the Triassic period) allowed to achieve the mean time between failures of 637 days and to increase the work efficiency at the salt hazardous well stock.

References

1. Shuster V.L., Punanova S.A., Samoylova A.V., Problems of searching and exploring for commercial oil and gas accumulations in fracture-cavernous massive rocks of Pre-Jurassic complex of West Siberia (In Russ.), Geologiya nefti i gaza = The journal Oil and Gas Geology, 2011, no. 2, pp. 26–33.

2. Meshcheryakova K.A., Karaseva T.V., The formation peculiarities of the Triassic troughs of the north of Western Siberia (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2010, V. 5, no. 3, pp. 1–11.

3. Shadrina S.V., Kondakov A.P., New data on the basement of the north-eastern framing of Krasnoleninskiy arch (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 11, pp. 94-99.

4. Tseplyaeva A.I., Modelirovanie zalezhey nefti v kollektorakh paleozoyskogo fundamenta na osnove kompleksirovaniya geologo-geofizicheskikh i promyslovykh dannykh (na primere odnogo iz mestorozhdeniy Krasnoleninskogo svoda) (Modeling of oil deposits in reservoirs of the Paleozoic basement based on the integration of geological-geophysical and field data (on the example of one of the fields of the Krasnoleninsky arch)): thesis of candidate of geological and mineralogical science, Tyumen, 2018.

5. Makeev A.A., Methods for increasing the service life of the ESP on the complicated well stock of the Oktyabrsky district (In Russ.), Inzhenernaya praktika, 2017, no. 5.

6. Makeev A.A., Leont'ev S.A., Shchelokov D.V., Shay E.L., Criteria for the introduction of gas-stabilizing devices in the wells of high-temperature reservoirs of the Krasnoleninsky arch deposits (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 1, pp. 66–67.

7. Makeev A.A., Shchelokov D.V., Shay E.L., Chirkov M.V., Efficiency of electric centrifugal pumps application for oil production from wells of pre-Jurassic formations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 8, pp. 74-76.

8. Makeev A.A., Shchelokov D.V., Shay E.L., Complications during the operation of wells of high-temperature deposits in the Oktyabrsky region (Krasnolensky arch) (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 2, pp. 42-44.

The article highlights geological and physical features of the pre-Jurassic Triassic complex. Promising targets for prospecting and exploration of oil depositions have been outlined. Consistent patterns associated with reservoir type and dynamic parameters of wells have been identified. Mixed type wells (porous-fractured, porous and fractured) demonstrate a relatively stable production rate. Wells with predominantly fractured reservoir type demonstrate a rapid decline in production. Oil production from wells of the pre-Jurassic complex (the Triassic period) is performed using electrical submersible pumps (ESP). High formation temperature of 116°C, total salt content of about 50 g/l in the produced formation fluid, GOR over 120 m3/m3 are considered as complicating factors for the Triassic target operation. Decrease in the time between failures in the wells of the pre-Jurassic complex (the Triassic period) is caused by the formation of salt residues. Measures were taken to increase the mean time between failures of ESP units. The well stock has been divided into groups; salt hazard categories have been identified for each well group. Criteria for the use of additional ESP units at the salt hazardous well stock of the pre-Jurassic complex (the Triassic period) have been identified. The methodology for the use of an inhibitor for salt depositions has been developed to determine the priority of wells treatment. The saturation index has been defined taking into account the temperature increase in the pump to improve the efficiency of forecasting salt depositions formation in wells of the pre-Jurassic Triassic complex. The methodologies applied to the wells of the pre-Jurassic complex (the Triassic period) allowed to achieve the mean time between failures of 637 days and to increase the work efficiency at the salt hazardous well stock.

References

1. Shuster V.L., Punanova S.A., Samoylova A.V., Problems of searching and exploring for commercial oil and gas accumulations in fracture-cavernous massive rocks of Pre-Jurassic complex of West Siberia (In Russ.), Geologiya nefti i gaza = The journal Oil and Gas Geology, 2011, no. 2, pp. 26–33.

2. Meshcheryakova K.A., Karaseva T.V., The formation peculiarities of the Triassic troughs of the north of Western Siberia (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2010, V. 5, no. 3, pp. 1–11.

3. Shadrina S.V., Kondakov A.P., New data on the basement of the north-eastern framing of Krasnoleninskiy arch (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 11, pp. 94-99.

4. Tseplyaeva A.I., Modelirovanie zalezhey nefti v kollektorakh paleozoyskogo fundamenta na osnove kompleksirovaniya geologo-geofizicheskikh i promyslovykh dannykh (na primere odnogo iz mestorozhdeniy Krasnoleninskogo svoda) (Modeling of oil deposits in reservoirs of the Paleozoic basement based on the integration of geological-geophysical and field data (on the example of one of the fields of the Krasnoleninsky arch)): thesis of candidate of geological and mineralogical science, Tyumen, 2018.

5. Makeev A.A., Methods for increasing the service life of the ESP on the complicated well stock of the Oktyabrsky district (In Russ.), Inzhenernaya praktika, 2017, no. 5.

6. Makeev A.A., Leont'ev S.A., Shchelokov D.V., Shay E.L., Criteria for the introduction of gas-stabilizing devices in the wells of high-temperature reservoirs of the Krasnoleninsky arch deposits (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 1, pp. 66–67.

7. Makeev A.A., Shchelokov D.V., Shay E.L., Chirkov M.V., Efficiency of electric centrifugal pumps application for oil production from wells of pre-Jurassic formations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 8, pp. 74-76.

8. Makeev A.A., Shchelokov D.V., Shay E.L., Complications during the operation of wells of high-temperature deposits in the Oktyabrsky region (Krasnolensky arch) (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 2, pp. 42-44.


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