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Features of modeling material and thermal calculation of oil separation process for oil rims

UDK: 665.62
Key words: field design and development, oil separation, phase transitions, oil rims, the management development system
Authors: Yu.V. Maksimov, S.S. Ivanov (Gazpromneft NTC LLC, RF, Saint-Petersburg)

Reserves of rims, when thickness does not exceed 10-15 m, are regarded as hard-to-recover. Development of oil reserves of oil-gas-condensate deposits is complicated because of multiphase flow in the formation, which leads to negative processes such as marginalization oil into the gas zone, gas breakthrough to the bottom of the production well (GOR increase of more than 1500 m3/t) and the disbanding of the oil rim. As a result, oil recovery does not exceed 10% of the initial endowments. To design oil preparation process in the case of joint production of gas and gas caps of the oil rims by the oil producing wells is necessary to correctly simulate the component-fractional composition of the produced fluid, taking into account the composition of the formation of oil and gas breakthrough in their number. The main difficulty of component-modeling of fractional composition of the produced fluid is the description of a hypothetical or pseudo-oil and hydrocarbon condensate produced from gas breakthrough. Calculated hypothetical components must describe the composition and properties of oil and condensate, both separately and mixtures thereof.

Based on the data properties and distillation of crude oil and hydrocarbon condensate are determined pseudo-components (fractions with boiling ranges specified), which have the following properties: a boiling range average boiling point, density, molar mass, critical pressure, temperature and volume, acentric factor. Taking into account the influence of the composition and the amount of gas breakthrough on the separation of oil, we can more precisely define modes of oil separation, calculate composition and properties of the material flow, and select the main technological equipment. The next step after modeling, material and thermal design of oil separation process is a definition of rational modes of separation in order to ensure the maximum output of oil and gas subject to the requirements for the pressure of saturated salable oil vapor and the maximum possible definition component distribution between gas and oil. 

References

1. Brusilovskiy A.I., Fazovye prevrashcheniya pri razrabotke mestorozhdeniy

nefti i gaza (Phase transformations in the development of oil and gas fields),

Moscow: Graal' Publ., 2002, 575 p.

2. Sardanashvili A.G., L'vova A.I., Primery i zadachi po tekhnologii pererabotki

nefti i gaza (Examples and problems of oil and gas processing technology),

Moscow: Khimiya Publ., 1980, 272 p.

3. Ivanov S.S., Tarasov M.Yu., Zobnin A.A., Oil yield enhancement and reduction

of light liquid hydrocarbons content in petroleum gas at oil treatment unit

design (Part 1), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 8, pp. 138–140.

Reserves of rims, when thickness does not exceed 10-15 m, are regarded as hard-to-recover. Development of oil reserves of oil-gas-condensate deposits is complicated because of multiphase flow in the formation, which leads to negative processes such as marginalization oil into the gas zone, gas breakthrough to the bottom of the production well (GOR increase of more than 1500 m3/t) and the disbanding of the oil rim. As a result, oil recovery does not exceed 10% of the initial endowments. To design oil preparation process in the case of joint production of gas and gas caps of the oil rims by the oil producing wells is necessary to correctly simulate the component-fractional composition of the produced fluid, taking into account the composition of the formation of oil and gas breakthrough in their number. The main difficulty of component-modeling of fractional composition of the produced fluid is the description of a hypothetical or pseudo-oil and hydrocarbon condensate produced from gas breakthrough. Calculated hypothetical components must describe the composition and properties of oil and condensate, both separately and mixtures thereof.

Based on the data properties and distillation of crude oil and hydrocarbon condensate are determined pseudo-components (fractions with boiling ranges specified), which have the following properties: a boiling range average boiling point, density, molar mass, critical pressure, temperature and volume, acentric factor. Taking into account the influence of the composition and the amount of gas breakthrough on the separation of oil, we can more precisely define modes of oil separation, calculate composition and properties of the material flow, and select the main technological equipment. The next step after modeling, material and thermal design of oil separation process is a definition of rational modes of separation in order to ensure the maximum output of oil and gas subject to the requirements for the pressure of saturated salable oil vapor and the maximum possible definition component distribution between gas and oil. 

References

1. Brusilovskiy A.I., Fazovye prevrashcheniya pri razrabotke mestorozhdeniy

nefti i gaza (Phase transformations in the development of oil and gas fields),

Moscow: Graal' Publ., 2002, 575 p.

2. Sardanashvili A.G., L'vova A.I., Primery i zadachi po tekhnologii pererabotki

nefti i gaza (Examples and problems of oil and gas processing technology),

Moscow: Khimiya Publ., 1980, 272 p.

3. Ivanov S.S., Tarasov M.Yu., Zobnin A.A., Oil yield enhancement and reduction

of light liquid hydrocarbons content in petroleum gas at oil treatment unit

design (Part 1), Neftyanoe khozyaystvo = Oil Industry, 2011, no. 8, pp. 138–140.



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