Fractal recognition method for cross-well sand body connectivity on basis of injection and production quantity relation

Abstract

The invention relates to the technical field of oil-gas field development and discloses a fractal recognition method for the cross-well sand body connectivity on the basis of the injection and production quantity relation. The injection and production quantities of a complex non-linear multi-phase-flow system composed of water injection wells, oil production wells and reservoirs between oil-waterwells are subjected to data recording. By obtaining the fractal dimension of the set of multi-variation injection and production quantity recorded data of the system, implied information of the connectivity of the reservoirs between the oil-water wells can be extracted, the method does not need complex mathematic models and geological static state model parameters, qualitative-quantitative explaining recognition can be achieved, and a new thought is developed for recognition of the connectivity of the inter-well reservoirs. The fractal recognition method has the beneficial effects that the cost is low, production dynamic data are utilized on the basis of the fractal theory, the complex mathematic models and geological static state model parameters are not needed, the theory is clear, the algorithm is simple, and qualitative-quantitative explaining recognition can be achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a fractal identification method for sand body connectivity between wells based on the relationship between injection and production volume. Background technique [0002] When the oilfield development enters the high water cut period, study the connectivity of interwell reservoirs and the direction of water flow of oil production wells, predict the remaining oil between wells, adjust well pattern layers, deploy newly drilled adjustment wells, and put into production perforations The formulation of the program plays an important guiding role in decision-making. At present, there are three main types of identification methods for interwell reservoir connectivity and water flow direction: ① Numerical simulation methods. The factors considered are more comprehensive, and the results obtained are more intuitive. However, due to the consideration of many factors,...

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Problems solved by technology

[0003] The present invention needs to establish a complicated mathematical interpretation model in order to solve the identification method of interwell reservoir connectivity and water flow direction in the prior art, the research and analysis time is long, the cost is high, and it also needs to rely on other geological models studied Insufficient, it provides a low-cost, based on fractal theory using production dynamic data, does not require complex mathematical models and geological static model parameters, clear theory, simple algorithm, can realize from qualitative to quantitative interpretation and identification based on the relationship between injection and production Fractal Identification Method of Interwell Sand Body Connectivity

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