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Physicochemical effects on core samples of the bituminous deposit Yegbata in the southwestern of Nigeria

UDK: 622.276.66
DOI: 10.24887/0028-2448-2019-5-91-93
Key words: bituminous oil, technological liquids, thermobaric condition, physicochemical effect
Authors: L.K. Nwizug-bee (Kuban State Technological University, RF, Krasnodar), O.V. Savenok (Kuban State Technological University, RF, Krasnodar), Yu.N. Moisa (Scientific and Production Association Himburneft LLC, RF, Krasnodar), D.Yu. Ivanov (Scientific and Production Association Himburneft LLC, RF, Krasnodar)

The world trend of reducing oil recovery in mature oil and gas fields in most producing countries, including the Federal Republic of Nigeria, actualizes the need to develop unconventional sources of raw hydrocarbons, primarily natural bitumen. According to expert’s estimates, bitumen resources in Nigeria reach 38 billion barrels in oil equivalent. These resources located in the southwest of the country exist in the form of oil sand and bitumen oil and form a belt of bituminous oil, covering about 120 km. Bituminous deposits in Nigeria were discovered in 1908 by the Nigerian Bitumen Corporation, but until now this unconventional resource has not been developed, despite the raw hydrocarbons demand of refineries and the growing volume of road construction in Nigeria. In this regard, research on the development of technological solutions and development of unconventional hydrocarbon reserves of bituminous deposits in Nigeria is a topical area. To extract hydrocarbons from bituminous deposits, various physical and chemical methods are used depending on the geological conditions of bitumen occurrence. We used a combined method of physicochemical impact on samples of bituminous coresamples under thermobaric conditions for modeling their occurrence at the Yegbata field of Nigeria using the equipment of the Research and Education Center "Physicochemistry of the reservoir" of Scientific and Production Association Himburneft LLC and the Kuban State Technological University (Krasnodar). The possibilities of combined physicochemical effects of technological fluids for the development of bituminous deposits in the southwestern Nigeria were studied. The study was performed under thermobaric conditions in the temperature range from 20 to 75 0С and pressure from 0.2 to 1 MPa using a core flood installation. As technological liquids, various compounds and compositions were used: low molecular weight paraffins, kerosene, acetone, water, aqueous solutions of potassium hydroxide in combination with various surfactants. For the conditions studied, the most effective combination of water-based formulations of potassium hydroxide in combination with surfactants was shown to be most effective.

References

1. Нвизуг-Би Л.К. Савенок О.В, Мойса Ю.Н. Классификация трудноизвлекаемых запасов на территории Федеративной Республики Нигерии // Наука, техника и образование. – 2015. – № 11. – С. 18–21.

2. Нвизуг-Би Л.К., Савенок О.В. Трудноизвлекаемые запасы углеводородов, важные ресурсы на территории Федеративной Республики Нигерии // Материалы XXI Международной научно-практической конференции. – М., 2015. – С. 41–46

3. Нвизуг-Би Л.К. Оценка технологических решений для разработки и освоения месторождений тяжелой и битуминозной нефти в Нигерии // Научный журнал КубГАУ. – 2016. – № 120 (06). – C. 44–65.

The world trend of reducing oil recovery in mature oil and gas fields in most producing countries, including the Federal Republic of Nigeria, actualizes the need to develop unconventional sources of raw hydrocarbons, primarily natural bitumen. According to expert’s estimates, bitumen resources in Nigeria reach 38 billion barrels in oil equivalent. These resources located in the southwest of the country exist in the form of oil sand and bitumen oil and form a belt of bituminous oil, covering about 120 km. Bituminous deposits in Nigeria were discovered in 1908 by the Nigerian Bitumen Corporation, but until now this unconventional resource has not been developed, despite the raw hydrocarbons demand of refineries and the growing volume of road construction in Nigeria. In this regard, research on the development of technological solutions and development of unconventional hydrocarbon reserves of bituminous deposits in Nigeria is a topical area. To extract hydrocarbons from bituminous deposits, various physical and chemical methods are used depending on the geological conditions of bitumen occurrence. We used a combined method of physicochemical impact on samples of bituminous coresamples under thermobaric conditions for modeling their occurrence at the Yegbata field of Nigeria using the equipment of the Research and Education Center "Physicochemistry of the reservoir" of Scientific and Production Association Himburneft LLC and the Kuban State Technological University (Krasnodar). The possibilities of combined physicochemical effects of technological fluids for the development of bituminous deposits in the southwestern Nigeria were studied. The study was performed under thermobaric conditions in the temperature range from 20 to 75 0С and pressure from 0.2 to 1 MPa using a core flood installation. As technological liquids, various compounds and compositions were used: low molecular weight paraffins, kerosene, acetone, water, aqueous solutions of potassium hydroxide in combination with various surfactants. For the conditions studied, the most effective combination of water-based formulations of potassium hydroxide in combination with surfactants was shown to be most effective.

References

1. Нвизуг-Би Л.К. Савенок О.В, Мойса Ю.Н. Классификация трудноизвлекаемых запасов на территории Федеративной Республики Нигерии // Наука, техника и образование. – 2015. – № 11. – С. 18–21.

2. Нвизуг-Би Л.К., Савенок О.В. Трудноизвлекаемые запасы углеводородов, важные ресурсы на территории Федеративной Республики Нигерии // Материалы XXI Международной научно-практической конференции. – М., 2015. – С. 41–46

3. Нвизуг-Би Л.К. Оценка технологических решений для разработки и освоения месторождений тяжелой и битуминозной нефти в Нигерии // Научный журнал КубГАУ. – 2016. – № 120 (06). – C. 44–65.


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