The application of depressant additives in the transport of high-paraffin oil

UDK: 622.692.4.052:665.61.033.22
DOI: 10.24887/0028-2448-2020-10-90-93
Key words: depressant additives, pour point of a crude oil, asphaltenes, resins, paraffins, the onset temperature of crystallization of paraffin, rheological characteristics, dynamic viscosity, crude oil transport, temperature depression (freezing point depression), hydraulic calculation of a pressure oil pipeline, oil treatment and pumping plant
Authors: E.A. Shafikova (RN-BashNIPIneft, LLC, RF, Ufa), N.G. Belenkova (RN-BashNIPIneft, LLC, RF, Ufa), I.M. Arslanova (RN-BashNIPIneft, LLC, RF, Ufa), A.K. Sakhibgareev (RN-BashNIPIneft, LLC, RF, Ufa), R.I. Valiakhmetov (RN-BashNIPIneft, LLC, RF, Ufa)

The main physicochemical characteristics of the properties of oil flows before and after hydraulic fracturing was determined. It is established that oil after hydraulic fracturing of the formation is highly paraffinic and has a high pour point. At transport the mixture of oils under consideration there are difficulties associated with the deposition of asphaltene-resins-paraffin deposits (ARPD) on oilfield equipment and, as a result, an increase in energy consumption during the pumping of this oil. The purpose of the work is to find an effective method to prevent the deposition of ARPD in the oil stream. The most modern and effective method of inhibition of  APRD precipitation in the pumped oil flow is currently the use of depressants, the addition of which to the stream in minimal volumes allows to decrease the pour point of the pumped oil to the required values.

To selection of depressant additives (DA), a complex of studies was carried out to investigate the physicochemical composition of crude oils, the freezing point depression of a crude oil at dosages of DA from 300 to 1500 g/t, and the influence of effective doses of DA on the onset temperature of crystallization of paraffin and rheological characteristics of crude oil. Also, a hydraulic calculation of the pressure head pipeline of oil treatment unit using the obtained rheological parameters of crude oil was carried out for pressure reduction estimation by the method of pressure gradient distribution assessment in the pipeline profile, and economic efficiency of DA application was considered.

References

1. Ivanova L.V., Burov E.A., Koshelev V.N., Asphaltene-resin-paraffin deposits in the processes of oil production, transportation and storage (In Russ.), Neftegazovoe delo = The electronic scientific journal Oil and Gas Business , 2011, no. 1, pp. 268–284, URL: http://ogbus.ru/authors/IvanovaLV/IvanovaLV_1.pdf

2. Ivanova L.V., Regulirovanie nizkotemperaturnykh svoystv neftyanykh sistem raznogo urovnya slozhnosti (Regulation of low-temperature properties of oil systems of various levels of complexity): thesis of doctor of chemical science, Moscow, 2016.

3. Shadrina P.N., Farkhutdinova L.I., Voloshin A.I. et al., Methodology of selection of reagents for inhibition highly paraffin oil (In Russ.), Neftegazovoe delo, 2016, V. 14, no. 4, pp. 64–68.

4. Patent RU 2495 408 C1, Method of determining freezing point of paraffins in oil, Inventors: Mikhalev A.Yu., Mikhalev Yu.P., Aginey R.V., Onatskiy V.L.

5.  Alferov A.V., Valiakhmetov R.I., Vinogradov P.V. et al., Improving the approach to determining period between two intratubal cleanings for field pipelines in the conditions of water accumulations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 1, pp. 82–85.

6. Arzhilovskiy A.V., Alferov A.V., Valiakhmetov R.I., Danileyko E.B., The concept of a system for monitoring the reliability and operation of pipelines (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 9, pp. 128–132.

The main physicochemical characteristics of the properties of oil flows before and after hydraulic fracturing was determined. It is established that oil after hydraulic fracturing of the formation is highly paraffinic and has a high pour point. At transport the mixture of oils under consideration there are difficulties associated with the deposition of asphaltene-resins-paraffin deposits (ARPD) on oilfield equipment and, as a result, an increase in energy consumption during the pumping of this oil. The purpose of the work is to find an effective method to prevent the deposition of ARPD in the oil stream. The most modern and effective method of inhibition of  APRD precipitation in the pumped oil flow is currently the use of depressants, the addition of which to the stream in minimal volumes allows to decrease the pour point of the pumped oil to the required values.

To selection of depressant additives (DA), a complex of studies was carried out to investigate the physicochemical composition of crude oils, the freezing point depression of a crude oil at dosages of DA from 300 to 1500 g/t, and the influence of effective doses of DA on the onset temperature of crystallization of paraffin and rheological characteristics of crude oil. Also, a hydraulic calculation of the pressure head pipeline of oil treatment unit using the obtained rheological parameters of crude oil was carried out for pressure reduction estimation by the method of pressure gradient distribution assessment in the pipeline profile, and economic efficiency of DA application was considered.

References

1. Ivanova L.V., Burov E.A., Koshelev V.N., Asphaltene-resin-paraffin deposits in the processes of oil production, transportation and storage (In Russ.), Neftegazovoe delo = The electronic scientific journal Oil and Gas Business , 2011, no. 1, pp. 268–284, URL: http://ogbus.ru/authors/IvanovaLV/IvanovaLV_1.pdf

2. Ivanova L.V., Regulirovanie nizkotemperaturnykh svoystv neftyanykh sistem raznogo urovnya slozhnosti (Regulation of low-temperature properties of oil systems of various levels of complexity): thesis of doctor of chemical science, Moscow, 2016.

3. Shadrina P.N., Farkhutdinova L.I., Voloshin A.I. et al., Methodology of selection of reagents for inhibition highly paraffin oil (In Russ.), Neftegazovoe delo, 2016, V. 14, no. 4, pp. 64–68.

4. Patent RU 2495 408 C1, Method of determining freezing point of paraffins in oil, Inventors: Mikhalev A.Yu., Mikhalev Yu.P., Aginey R.V., Onatskiy V.L.

5.  Alferov A.V., Valiakhmetov R.I., Vinogradov P.V. et al., Improving the approach to determining period between two intratubal cleanings for field pipelines in the conditions of water accumulations (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 1, pp. 82–85.

6. Arzhilovskiy A.V., Alferov A.V., Valiakhmetov R.I., Danileyko E.B., The concept of a system for monitoring the reliability and operation of pipelines (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2018, no. 9, pp. 128–132.



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