New method for dividing water injection layer sections of offshore water injection well

Abstract

The invention provides a new method for dividing water injection layer sections of an offshore water injection well. The new method for dividing the water injection layer sections of the offshore water injection well includes the following steps: a step 1, comprehensively considering the permeability gradational difference, the thickness gradational difference, the number of small layers in each layer, the water logging degree of each layer and the pressure difference so as to determine a water injection well layered injection boundary standard through a numerical simulation method; a step 2, counting the number of layers, the sand thickness, the permeability, the water logging degree and pressure distribution of an injection opened layer position of an existing layer section of the water injection well, and calculating the thickness gradational difference and the permeability gradational difference of each water injection layer section; a step 3, performing layer section primary division on the water injection well according to the layered injection boundary standard; and a step 4, considering the water injection process, performing suitable adjustment, and acquiring a final division result. The new method for dividing the water injection layer sections of the offshore water injection well is clear in thinking , is simple to apply, is feasible in offshore and similar oil reservoir water injection well layer section division.

Description

Technical field

[0001] The invention relates to the technical field of subdivision water injection of offshore oil reservoirs, in particular to a new method for dividing water injection intervals of offshore water injection wells. Background technique

[0002] Offshore oil reservoirs are fluvial deposits, with strong reservoir heterogeneity. Generally, multiple sets of oil layers are developed vertically, and the physical properties of each oil layer are quite different. In order to reduce interlayer interference, water injection wells basically use staged water injection. In the early days, they were mostly in the first two stages and two stages and three stages. Due to the limitations of the technology at the time, the division of water injection intervals for water injection wells also considered the difference in reservoir physical properties. However, the main consideration is the technological factor and the oil reservoir factor as a supplement.

[0003] With the developmen...

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