Water Control Experiments in Huizhou Buried-Hill Fractured Condensate Reservoirs in Nanhai Oilfield

doi:10.7657/XJPG20230112

Abstract

Abstract:

In order to establish an optimal water control model for buried-hill fractured condensate reservoirs, based on the parameters from Well H2-3 in Huizhou buried-hill fractured condensate reservoirs in Nanhai oilfield, a physical simulation experiment for water control in gas reservoirs was designed. Through heterogeneous reservoir design, experiment parameter design, fracture parameter design and water control experiment scheme design, 5 groups of water control experiments were conducted, including elastic production experiment, continuous packer experiment, water-sensitive gel experiment, variable density screen experiment and variable density screen + continuous packer experiment. Then, their water control effects were compared, and water control mechanism of each experiment was analyzed. On this basis, verification was performed by using numerical simulation, and the water control development scheme of gas reservoir was given. The results show that in the stage of early development driven by bottom water of gas reservoir, the water body advances in a gradual manner; in the middle-late stage, the water body advances in a conical manner; and in the late stage, once the bottom water contacts the fractures in the reservoir, the water body will intrude in a sudden manner. The water control effects of the five schemes are different. The schemes of continuous packer and water-sensitive gel exhibit unobvious water control effects in the gas production stage, and the scheme of variable density screen demonstrates good water control effect in the early gas production stage, but fails to avoid the risk of water channeling after water breakthrough in a gas well. The scheme of variable density screen + continuous packer shows good water control effect, with the bottom water coning effect changed, and with the water-free gas production period, total gas production period and gas production volume increased by 8.84%, 13.70% and 10.40%, respectively as compared with the scheme of elastic production.

Key words: Nanhai oilfield, buried-hill fractured condensate reservoir, water control process, physical simulation, numerical simulation, water control mechanism

CLC Number:

TE344

QIU Hao, WEN Min, WU Yi, XING Xuesong, MA Nan, LI Zhandong, GUO Tianzi. Water Control Experiments in Huizhou Buried-Hill Fractured Condensate Reservoirs in Nanhai Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(1): 84-92.

Figures/Tables 8

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