Comprehensive method and system for automatically judging connectivity between production wells in fractured-cavity reservoirs

Abstract

The invention relates to a comprehensive method and system for automatically judging connectivity between fractured-vuggy reservoir production wells. The method comprises the following steps of: according to the production data of a well group to be judged, judging the inter-well initial connectivity between any two production wells in the well group to be judged independently on the basis of the production data change, the production curve similarity, the water breakthrough time interval and the pressure drop tendency of adjacent wells when the wells are opened and closed; endowing inter-well initial connectivity, which is obtained by different judgment, between any two production wells in the well group to be judged with different weights, and obtaining the inter-well comprehensive connectivity between any two production wells in the well group to be judged; and according to the inter-well comprehensive connectivity between any two production wells in the well group to be judged, obtaining the connectivity of the well group to be judged. On the basis of conventional production dynamic data, other static data is not required; and the error of single judgment due to interference among multiple wells can be effectively avoided, the change of a practical production work system is comprehensively considered, judgement accuracy is further improved, and the judgment of the connectivity of fractured-vuggy units on the basis of the production data is realized.

Description

technical field [0001] The invention relates to the technical field of oil reservoir engineering, in particular to a comprehensive method and system for automatically judging the connectivity between production wells of fracture-cavity oil reservoirs. Background technique [0002] Fracture-vuggy reservoirs have various types of storage and seepage space, and the reservoirs are highly heterogeneous. If the degree of correspondence between injection and production is not clear, the effect of water injection development in the later stage will be affected; therefore, it is necessary to conduct research on the connectivity between reservoir wells to clarify the water flow of injection wells. Direction and injection-production parameters are used to avoid problems such as poor water flooding balance after water injection and serious water crossing in some wells. [0003] At present, the commonly used research methods of reservoir interwell connectivity mainly include static metho...

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Problems solved by technology

However, due to the strong heterogeneity of fracture-vuggy reservoirs and the irregularity of well patterns, the above research methods cannot effectively understand the connectivity of fracture-vuggy bodies, and there are interferences between wells, which are expensive and limited in number of wells. It is impossible to determine whether the water-bearing well is connected or not, which affects production efficiency and other issues

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