Well testing interpretation model for analyzing fracture-cave series mode double-hole composite reservoir

Abstract

The invention relates to a well testing interpretation model for analyzing a fracture-cave series mode double-hole composite reservoir, which comprises the following steps of: 1, establishing a corresponding physical model according to reservoir characteristics of a certain type of oil reservoir; 2, establishing a mathematical model, wherein the mathematical model is used for describing a physicalmodel; 3, solving the mathematical model to obtain a real space bottom hole pressure solution; and 4, drawing a real space well testing theoretical curve by utilizing a real space well bottom pressure solution, analyzing the well testing theoretical curve, performing curve fitting on theoretical pressure data and actually measured pressure recovery data to obtain a fitting result, and obtaining interpretation parameters which comprise fracture conductivity, fracture length, karst cave volume and karst cave storage capacity ratio. By solving the well testing mathematical model of the fracture-cavity series mode, the well bottom pressure solution of the fracture-cavity series mode is obtained, the typical well testing curve is drawn, the stratum parameters are obtained, the well testing interpretation method of the fracture-cavity series mode double-hole composite reservoir is determined, and the fracture-cavity type oil reservoir is accurately evaluated and effectively developed.

Description

Technical field: [0001] The invention relates to the field of oil and gas field development engineering, in particular to a well test interpretation model for analyzing double-pore composite reservoirs in a fracture-cave series mode. Background technique: [0002] The reservoir space of fractured-vuggy carbonate reservoirs is dominated by large-scale dissolved caves, large fractures, and dissolved vugs, and double-medium or triple-medium media composed of secondary fractures, micro-fractures, and dissolved vugs are widely distributed in the reservoir. The effective reservoir space, the media connectivity and distribution state of the reservoir space are different from conventional oil reservoirs, and the reservoir medium has strong heterogeneity and multi-scale. The flow law of fluid in large-scale caves and fractures in fracture-vuggy reservoirs is not just a certain seepage mode, but the coupled flow of seepage and free flow. Therefore, the most important aspect to unders...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a well test interpretation model for analyzing the dual-pore composite reservoir of the fracture-cave series mode, which is used to solve the problem of fracture-cavity carbon Well Test Interpretation Problems of Fracture-Vug Series Mode Existing in Dual Porosity Composite Reservoirs of Salt Reservoirs

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