Abstract

Due to the existence of large fractures and vugs, it is not possible to use the Darcy flow theory to analyse the inter-well connectivity in carbonate fractured-vuggy reservoirs. In order to solve this problem, a new inter-well connectivity method based on the conduit flow theory is established in this paper, which regards the large fractures and vugs as the flowing tubes that have different diameters. Firstly, establishing a material balance equation of the well point based on the conduit flow theory to solve the well point theoretical pressure. Secondly, using the well testing pressure to convert the well point actual pressure. Thirdly, matching the well point theoretical pressure and the well point actual pressure to calculate the flowing tube diameters between the injection-production wells. Finally, computing the inter-well connectivity coefficient to quantitatively character the degree of the inter-well connectivity between the injection-production wells. This model has applied in a fractured-vuggy reservoir to analyse the inter-well connectivity, and the calculated results have a high matching degree with the actual field results. What estimates this method has a great significance for studying the inter-well connectivity analysis and guiding the water-flooding development of carbonate fracture-vuggy reservoir.

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