Multi-layer commingled oil reservoir development full-cycle productivity correction method considering interlayer interference

Abstract

The invention discloses a multi-layer commingled oil reservoir development full-cycle productivity correction method considering interlayer interference. The method comprises the following steps: determining an interference coefficient caused by interlayer permeability difference according to oil reservoir parameters at the initial stage of oil reservoir development and a two-layer commingled oilreservoir model at the initial stage of oil reservoir development; determining an interference coefficient caused by interlayer pressure imbalance according to the oil reservoir parameters in the middle oil reservoir development stage and the two-layer commingled oil reservoir model in the middle oil reservoir development stage; determining interference coefficients caused by different longitudinal reservoir distribution ranges according to the oil reservoir parameters in the later period of oil reservoir development and the two-layer commingled oil reservoir model in the later period of oil reservoir development; and correcting the productivity of the directional well in the whole life cycle from production to discarding according to the interference coefficient. Parameters involved in the method are easy to obtain, the formula is relatively simple, the calculation result can be obtained quickly, and the coincidence degree with the actual result is high; The considered seepage theoryis comprehensive.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to a full-cycle productivity correction method for multi-layer co-production oil reservoir development considering interlayer interference. Background technique [0002] For the purpose of improving economic benefits, offshore oil fields are often developed in a way of a set of strata and fewer wells in the early stage of production. However, due to strong vertical heterogeneity of reservoirs and large differences in reservoir types, serious interlayer interference results in rapid production decline at the initial stage of oil well production and low water flooding recovery. Therefore, accurate prediction of interlayer interference coefficient and oil well productivity in different development stages is the focus of multi-layer co-production reservoir development. [0003] At present, the research methods of interlayer interference mainly include in...

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Problems solved by technology

[0004] The research on interlayer interference and production capacity in the existing technical methods mainly focuses on a specific period of oilfield development, while there are few studies on interlayer interference in different stages of the development process; at the same time, due to the limitation of development costs in offshore oilfields, dynamic testing Due to the lack of data, it is impossible to conduct a fine understanding of the degree of interlayer interference, and the current research method does not study the interference caused by the difference in interlayer pressure and the difference in vertical injection-production relationship, which cannot meet the development needs of multi-layer co-production reservoirs

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