A reservoir dynamic monitoring method and device

Abstract

The invention relates to a bran-new technical scheme for dynamically monitoring an oil deposit. The scheme comprises the following steps: obtaining the regular yield data of the oil deposit or a single well for calculating a Y function and accumulated liquid production capacity, wherein the Y function is a product of moisture content and oil content, and the sum of the moisture content and the oil content is 1; drawing the relation curve of the Y function and the accumulated liquid production capacity under a log-log coordinate, and monitoring the slope of the relation curve; responding to a line segment with the slope of curve of -1, determining that the oil deposit or the single well enters a water drive state, and carrying out at least one monitoring operation on the line segment with the slope of -1; responding the slope of the curve not to be -1, identifying water channeling and calculating the fluid channeling water amount. Through adoption of the method, the problems possibly existing in the production of the oil deposit or the single well can be dynamically diagnosed at the water drive state, and the solution is provided.

Description

technical field [0001] The invention relates to a technical solution for dynamic monitoring of oil reservoirs, more specifically, the invention relates to a method and device for dynamic monitoring of water flooding oil reservoirs. Background technique [0002] At present, the methods that can be used for reservoir dynamic analysis are mainly Arps decline equation and various water drive curves. For a long time, these existing empirical formulas have been widely used in oilfield dynamic analysis and production data management. Each oilfield has modified the above methods according to its own actual situation, and obtained empirical formulas suitable for its own oilfields. [0003] However, there are some common defects in the existing methods: 1) All of them are empirical formulas, lacking strict theoretical basis, and cannot be widely used in the daily production of oilfields, while the Arps decline equation can only be used in the depletion stage of oil reservoirs. The fl...

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Problems solved by technology

[0003] However, there are some common defects in the existing methods: 1) All of them are empirical formulas, lacking strict theoretical basis, and cannot be widely used in the daily production of oilfields, while the Arps decline equation can only be used in the depletion stage of oil reservoirs. The flooding curve can only be used after the reservoir water cut is greater than 85%; 2) When the above empirical formula exists, the development of reservoir engineering theory is still insufficient, and there is no strict distinction between different production stages of the reservoir.

The misuse of the Arps equation is particularly prominent. Although major domestic oil fields and related scientific researchers have conducted relevant research on this problem, they only found the problem and could not fundamentally solve the problem of misuse of the method; especially When the reservoir production is in the late stage of water flooding development, the phenomenon of "water channeling" will occur. At present, there is no method that can qualitatively identify whether water channeling has occurred in the whole area or a single well, and the exact time of water channeling, let alone quantify the water channeling. Flowing water is distinguished from cumulative liquid production, which causes damage to on-site production equipment, reservoir engineers cannot make correct development plans based on wrong information, and failures caused by water channeling also occur in reservoir numerical simulation work. Complete History Fitting Phenomenon

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