A simulation method of petroleum phase behavior in injection and production process of underground gas storage in a gas field

WANG Jieming, SHI Lei, ZHANG Yu, ZHANG Ke, LI Chun, CHEN Xianxue, SUN Junchang, QIU Xiaosong

doi:10.11698/PED.20220121

0 20221003 - 20221003

DOI: https://doi.org/10.11698/PED.20220121

A simulation method of petroleum phase behavior in injection and production process of underground gas storage in a gas field

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1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
2. Key Laboratory of Oil and Gas Underground Storage Project of China National Petroleum Corporation, Langfang 065007, China;
3. China University of Petroleum, Beijing 102249, China;
4. State Key Laboratory of Heavy Oil Processing, Beijing 102249, China;
5. State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China;
6. PetroChina Liaohe Oilfield Company, PetroChina, Panjin 124010, China

Received date: 2022-02-17

Revised date: 2022-06-22

Online published: 2022-06-24

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Abstract

On the basis of analyzing the fluid phase behavior during the transformation from gas reservoir to gas storage, a mathematical model and an experimental simulation method are established to describe the characteristics of oil-gas phase behavior during the whole injection-production process of gas storage. The underground gas storage in the Liaohe Shuang 6 gas reservoir with oil ring is taken as a typical example to verify the reliability and accuracy of the mathematical model and reveal characteristics and mechanisms of fluid phase behavior. The results show that in the gas injection stage of the gas storage, the phase behavior is characterized by mainly evaporation and extraction and secondarily dissolution and diffusion of gas in the cap to oil in the oil ring of the reservoir; the gas in gas cap increases in light component content, decreases in contents of intermediate and heavy components, and increases in density and viscosity. The oil of the ring decreases in content of heavy components, increases in contents of light and intermediate components, decreases in density and viscosity, and increases in volume factor and solution gas oil ratio. In the stable operation stage of periodic injection-production of gas storage, the phase behavior shows that the evaporation and extraction capacity of injection gas to oil rim is weakened step by step, the phase behavior gradually changes into dissolution and diffusion playing an important role. The gas in gas cap decreases in content of intermediate components, increases in content of light components slowly, and becomes lighter; but changes hardly in density and viscosity. The oil in the oil ring increases in content of heavy components, decreases in content of intermediate components, rises in density and viscosity, and drops in volume factor and solution gas oil ratio.

Key words： underground gas storage; mathematical model; experimental simulation; phase behavior characteristic; action mechanism

Cite this article

WANG Jieming, SHI Lei, ZHANG Yu, ZHANG Ke, LI Chun, CHEN Xianxue, SUN Junchang, QIU Xiaosong . A simulation method of petroleum phase behavior in injection and production process of underground gas storage in a gas field[J]. Petroleum Exploration and Development, 0 : 20221003 -20221003 . DOI: 10.11698/PED.20220121

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