The Essence and Re-recognition of Interlayer Interference

doi:10.11885/j.issn.1674-5086.2022.04.12.03

Abstract

Abstract: Due to the impact of lithology and physical properties of each layer, and the difference of formation pressure and fluid physical properties of each reservoir section in the process of production, there are always problems of mutual restriction and interference between layers in the process of commingled injection and production of multi-layer reservoir. Improper water injection development mode will lead to the difference of water absorption capacity, oil production status and water flooding degree of each layer, and show a big interlayer contradiction in production performance, thus affecting the balanced production and ultimate recovery of each layer and the whole reservoir. The interlayer interference coefficients, as defined so far, can quantitatively characterize the interlayer interference phenomena, but their physical connotation is inconsistent with the actual seepage process of water injection development. To solve the problems of early studies on interlayer interference, the research takes a typical multi-layer reservoir X of an offshore oil field as an example, using laboratory experiment method, reservoir engineering method and numerical simulation method, to analyze the root and essence of interlayer interference in early experimental testing and theoretical research of commingled production. The research results show that the interlayer interference in segmented test and overall test is caused by the disequilibrium of pressure field and seepage field of reservoir. Based on the research results, a new method of well productivity calculation, considering interlayer interference, is established. The application results show that the new methods of quantitative evaluation of interlayer contradiction and well productivity calculation, based on the essence of interlayer interference, are more consistent with the actual reservoir situation, and provide theoretical basis for predicting the productivity of commingled injection and production in multi-layer reservoirs and the formulation of strategies to reduce the impact of interlayer interference on actual production.

Key words: commingled production, interlayer interference and channeling flow, numerical simulation, experimental verification, productivity calculation

CLC Number:

TE341

TANG Hai, ZHANG Kaili, TANG Ruixue, Lü Dongliang, TAN Lü. The Essence and Re-recognition of Interlayer Interference[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(5): 113-124.

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