Infinite dual-medium oil reservoir mathematical modeling method for partial-intercommunication fault boundary

Abstract

The invention provides an infinite dual-medium oil reservoir mathematical modeling method for a partial-intercommunication fault boundary. The infinite dual-medium oil reservoir mathematical modeling method for the partial-intercommunication fault boundary comprises the steps that the instable pressure characteristic of a two-region infinite dual-medium oil reservoir with the partial-intercommunication fault boundary is taken into consideration firstly; a well test interpretation model of the two-region infinite dual-medium oil reservoir with the partial-intercommunication fault boundary is established; then a mathematical model is solved, and Laplace transformation is conducted on a zero-dimension well testing model, so that a similar seepage differential equation is obtained; a numerical solution of the bottom hole pressure pwfD (xD, yD and tD) with the well storage and skin effect influences taken into consideration in the real space is obtained finally, and a typical curve of the partial-intercommunication fault boundary in the two-region infinite dual-medium oil reservoir is drawn; and a transient well test interpretation model and a relevant curve are obtained through calculation by means of a point source function, and a reliable basis is provided for analysis of the condition of the infinite dual-medium oil reservoir with the partial-intercommunication fault boundary.

Description

technical field [0001] The invention belongs to the field of geological exploration, and relates to a mathematical modeling method for an infinitely large dual-media reservoir with partially connected fault boundaries. Background technique [0002] At present, domestic and foreign scholars' research on fault boundaries and the analysis of corresponding pressure and pressure derivative curves are all focused on sealed faults, while there are relatively few studies on unsealed faults, and there are relatively few studies on well test interpretation models with unsealed fault boundaries. few. There is also little research on dual-media reservoir models with partially connected fault boundaries. [0003] The following is the research status of well testing models for partially connected faults: [0004] 1. Bixel et al. believed that partially connected faults were actually linear discontinuous distributions of reservoir properties on the plane, and were the first to study such...

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Problems solved by technology

[0010] The current well testing models for partially connected fault boundaries are based on homogeneous formations; in fact, in many formations with dual medium characteristics, there are also partially connected fault boundaries, and the existing methods cannot be correct Well test conditions reflecting partially connected fault boundaries

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