Variations of oil bubble point pressure in Mahu 1 well block of Mahu Depression

被引：0

作者：

Han B. ^{[1
]}

Luo F. ^{[1
]}

Wang Z. ^{[1
]}

Li D. ^{[1
]}

Jing W. ^{[2
]}

Cheng Y. ^{[2
]}

Li A. ^{[2
]}

机构：

[1] Exploration and Development Research Institute, PetroChina Xinjiang Oilfield Company, Karamay

[2] School of Petroleum Engineering in China, University of Petroleum (East China), Qingdao

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2023年 / 47卷 / 02期

关键词：

bubble point pressure; dissolved gas-oil ratio; Mahu 1 well bock; Mahu reservoir; migration resistance; tectonic movement;

D O I：

10.3969/j.issn.1673-5005.2023.02.012

中图分类号：

学科分类号：

摘要：

Mahu 1 block is a lithologic and glutenite unsaturated oil reservoir located in the south slope zone of Mahu Depression. The relationship of its oil bubble point pressure with depth has poor regularity, which cannot be explained using the conventional models and has a great effect on the project design and development of the reservoir. In this study, the causes of the bubble pressure irregularity were investigated by analyzing the tectonic movement and the process of crude oil accumulation in Mahu Depression. The variation of bubble point pressure with depth in conventional oil reservoirs(in which oil and gas properties are assumed to be the same everywhere in the reservoir)was tested by PVT experiments, and it is proposed that a secondary accumulation of light oil and the heterogeneity of the reservoir are the main causes of the irregular change of bubble point pressure with depth. A method for determining the bubble pressure in Mahu 1 block was proposed based on oil and gas migration resistance. The results show that there were two petroleum accumulation periods with large time interval in the formation of Mahu 1 block, and the oil quality in the second accumulation period was much better than that in the first period. The saturation pressure and gas-oil ratio in Mahu 1 block decrease with the increase of average oil and gas migration resistance in a power function relationship. © 2023 University of Petroleum, China. All rights reserved.

引用

页码：108 / 114

页数：6

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