Factors Influencing Effective Storage Capacity of Abnormally-High-Pressure Water-Containing Condensate Gas Reservoirs

doi:10.7657/XJPG20220412

Abstract

Abstract:

As a key parameter, the effective storage capacity of a UGS affects the function, peaking capability, parameters and design of the UGS, so its accurate evaluation is very important. When converting an abnormally-high-pressure water-containing condensate gas reservoir into a UGS, factors such as abnormally high pressure, water intrusion and reverse condensate affect the storage capacity. Considering abnormally high pressure, the upper limit of the pressure for the UGS is designed to be 58.00 MPa, which is much lower than the original formation pressure. The difference of the gas volume coefficient results in the difference of the storage capacity of the UGS. During the injection-production process, water flows back and forth in the UGS, which dramatically affects the utilization of reservoir space. In the alternative production-injection process, when the formation pressure is lower than the dew point pressure, separated condensate oil has a certain influence on the storage capacity. In response to this problem, an improved dual model integrating material balance and numerical simulation was established. Based on the dynamic reserves of gas reservoirs, factors such as abnormal high pressure, reverse condensation, water intrusion were quantitatively analyzed, and a set of methods for evaluating the capacity of the UGS were developed. The set of methods was applied for constructing the Lunnan-59 Carboniferous UGS. The effective storage capacity of the UGS was accurately evaluated. This lays a foundation for the research on the parameters of the UGS, and ensures the successful construction of the Lunnan-59 Carboniferous UGS.

Key words: UGS, condensate gas reservoir, abnormally high pressure, water intrusion, effective storage capacity, improved material balance model, dynamic reserves, influencing factor

CLC Number:

P624.7

FAN Jiawei, WU Zangyuan, YU Song, ZHOU Daiyu, YAN Gengping, WANG Chao. Factors Influencing Effective Storage Capacity of Abnormally-High-Pressure Water-Containing Condensate Gas Reservoirs[J]. Xinjiang Petroleum Geology, 2022, 43(4): 463-467.

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