A New Production Splitting Method for Unconsolidated Sandstone Gas Reservoir with Water

doi:10.11885/j.issn.1674-5086.2023.02.20.02

Abstract

Abstract: Production splitting is a prerequisite for the accurate description of multilayer gas reservoirs. However, KH method, mutation method, gas production profile test and other production splitting methods commonly used at present have some problems, such as low accuracy and no long-term dynamic production splitting. In order to solve the problems, the iterative calculation was carried out by combining the stress-sensitive productivity equation and the material balance equation considering the influence of water sealed gas, and automatic fitting method was used to fit the production history, the optimal fitting parameters were obtained, and A new production splitting method for unconsolidated sandstone gas reservoir with water was innovatively proposed. The results show that when laminar coefficient and turbulent coefficient of the combined production zone are different, the contribution rate curve presents an “X ” type trend; when dynamic reserves of the combined production zone are different, the contribution rate curve of production presents a “<” type trend; the greater the difference between laminar coefficient, turbulent coefficient and dynamic reserves, the greater the difference between production contribution rates. Through the case analysis of a gas well in Sebei-2 Gas Field, it is found that the research results show that the production splitting result for unconsolidated sandstone gas reservoir with water is similar to the test result of gas production profile (average error 4.70%), and the contribution rate of production can be obtained in real time.

Key words: stress sensitivity, gas reservoir with water, water sealed gas, multilayer commingled, production splitting

CLC Number:

TE343

WANG Guofeng, WANG Xiaolu, KUI Mingqing, ZHAO Hui, MIAO Miao. A New Production Splitting Method for Unconsolidated Sandstone Gas Reservoir with Water[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(4): 113-120.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2023.02.20.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2025/V47/I4/113

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