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Equipment for flushing of wells complicated by asphaltene-resin-paraffin deposits using hollow sucker rods

UDK: 622.276.72
DOI: 10.24887/0028-2448-2018-7-110-112
Key words: asphaltene-resin-paraffin deposits, methods for removal of asphaltene-resin-paraffin deposits, heat treating, hollow sucker rods, sucker rod pump (SRP)
Authors: A.V. Kovalev (Zarubezhneft-Production Samara LLC, RF, Samara), R.T. Miftakhov (Zarubezhneft-Production Samara LLC, RF, Samara), M.S. Ryakhin (Zarubezhneft JSC, RF, Moscow), A.V. Kolyvanov (ELKAM, RF, Perm)

The article is devoted to warm-up and flush equipment set with hollow sucker rods designed and manufactured by ELKAM Company. This equipment is applied for hot flushing of oil wells equipped by downhole sucker rod pumps and complicated by asphaltene-resin-paraffin deposits, where tubing is used as a production string and hollow sucker rods with couplings are used as a heat transfer agent channel. Hot flushing agent (oil or water, superheated steam, chemical agents) is injected through the high-pressure hose to the hollow sucker rods string, and from there through the special washing coupling it flows above the pump and below the ARWD accumulation zone. Flow of hot agent to the wellhead provides dissolution of ARW deposits. Also the article contains the detailed description of warm-up and flush equipment set operation and the results of field trial in the oilfields of Ulyanovskneftegas LLC during which operability this technology was confirmed and oil production targets were reached: decrease of flushing fluid volumes, refusal of usage of oil as a flushing agent, decrease of expenses for special vehicles for flushing, exception of downhole equipment failure because of ARW deposition. According to the findings of the commission of Ulyanovskneftegas LLC, ELKAM’s warm-up and flush equipment successfully passed field testing and corresponds to the requirements of industrial and ecological safety requirements.

References

1. Persiyantsev M.N., Dobycha nefti v oslozhnennykh usloviyakh (Oil production in complicated conditions), Moscow: Nedra-Biznestsentr Publ., 2000, 653 p.

2. Tronov V.P., Mekhanizm obrazovaniya smolo-parafinovykh otlozheniy i bor'ba s nimi (Mechanism of formation of resin-paraffin deposits and its control), Moscow: Nedra Publ., 1970, 192 p.

3. Kayumov M.Sh., Tronov V.P., Gus'kov I.A., Lipaev A.A., The account of asphalt-tar-paraffin deposits formation features at a late stage of development of petroleum deposits (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2006, no. 3, pp. 48–49.

4. Sorokin S.A., Khavkin S.A., Features of physical and chemical mechanism of production asphalted, resinous and of paraffin formations in the wells (In Russ.), Burenie i neft', 2007, no. 10, pp. 30–31.

5. Sorokin A.V., Tabakaeva A.V., Influence of the gas content in petroleum on ARDO formation in the well lift (In Russ.), Burenie i neft', 2009, no. 2, pp. 25–26.

6. Zevakin N.I., Mukhametshin R.Z., Parafinootlozheniya v plastovykh usloviyakh gorizonta D1 Romashkinskogo mestorozhdeniya (Paraffin deposits in the formation conditions of the horizon D1 of the Romashkinskoye oilfield), Proceedings of TatNIPIneft', 2008, 472 p.

7. Sharifullin A.V., Baybekova L.R., Suleymanov A.T., Features of composition and structure of oil deposits (In Russ.), Tekhnologii nefti i gaza, 2006, no. 6, pp. 19–24.

8. Khokhlov N.G., Vagapov R.R., Shagitov Z.M., Mustafin A.S., Asphalt-resin substances and paraffin removal in Yuzharlanneft NGDU oil pipelines (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2006, no. 1, pp. 110–111.

The article is devoted to warm-up and flush equipment set with hollow sucker rods designed and manufactured by ELKAM Company. This equipment is applied for hot flushing of oil wells equipped by downhole sucker rod pumps and complicated by asphaltene-resin-paraffin deposits, where tubing is used as a production string and hollow sucker rods with couplings are used as a heat transfer agent channel. Hot flushing agent (oil or water, superheated steam, chemical agents) is injected through the high-pressure hose to the hollow sucker rods string, and from there through the special washing coupling it flows above the pump and below the ARWD accumulation zone. Flow of hot agent to the wellhead provides dissolution of ARW deposits. Also the article contains the detailed description of warm-up and flush equipment set operation and the results of field trial in the oilfields of Ulyanovskneftegas LLC during which operability this technology was confirmed and oil production targets were reached: decrease of flushing fluid volumes, refusal of usage of oil as a flushing agent, decrease of expenses for special vehicles for flushing, exception of downhole equipment failure because of ARW deposition. According to the findings of the commission of Ulyanovskneftegas LLC, ELKAM’s warm-up and flush equipment successfully passed field testing and corresponds to the requirements of industrial and ecological safety requirements.

References

1. Persiyantsev M.N., Dobycha nefti v oslozhnennykh usloviyakh (Oil production in complicated conditions), Moscow: Nedra-Biznestsentr Publ., 2000, 653 p.

2. Tronov V.P., Mekhanizm obrazovaniya smolo-parafinovykh otlozheniy i bor'ba s nimi (Mechanism of formation of resin-paraffin deposits and its control), Moscow: Nedra Publ., 1970, 192 p.

3. Kayumov M.Sh., Tronov V.P., Gus'kov I.A., Lipaev A.A., The account of asphalt-tar-paraffin deposits formation features at a late stage of development of petroleum deposits (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2006, no. 3, pp. 48–49.

4. Sorokin S.A., Khavkin S.A., Features of physical and chemical mechanism of production asphalted, resinous and of paraffin formations in the wells (In Russ.), Burenie i neft', 2007, no. 10, pp. 30–31.

5. Sorokin A.V., Tabakaeva A.V., Influence of the gas content in petroleum on ARDO formation in the well lift (In Russ.), Burenie i neft', 2009, no. 2, pp. 25–26.

6. Zevakin N.I., Mukhametshin R.Z., Parafinootlozheniya v plastovykh usloviyakh gorizonta D1 Romashkinskogo mestorozhdeniya (Paraffin deposits in the formation conditions of the horizon D1 of the Romashkinskoye oilfield), Proceedings of TatNIPIneft', 2008, 472 p.

7. Sharifullin A.V., Baybekova L.R., Suleymanov A.T., Features of composition and structure of oil deposits (In Russ.), Tekhnologii nefti i gaza, 2006, no. 6, pp. 19–24.

8. Khokhlov N.G., Vagapov R.R., Shagitov Z.M., Mustafin A.S., Asphalt-resin substances and paraffin removal in Yuzharlanneft NGDU oil pipelines (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2006, no. 1, pp. 110–111.


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