Determination method, calculation method and determination system for semi-filled fracture-vug reservoir quasi-relative permeability
A technology of relative permeability and determination method, applied in the field of unconventional oil reservoir development in the petroleum industry, can solve the problems of small calculation time, low accuracy, large amount of calculation, etc., to improve the calculation speed, large scale, and reduce the technical threshold Effect
Pending Publication Date: 2022-02-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The three simulation models are a game problem of calculation amount and accuracy, that is, the triple-media model and the equivalent continuum model have mature methods, less difficulty, less time-consuming calculation, but lower accuracy; while the discrete fracture-cavity network calculation The threshold is high, the amount of calculation is large, but the calculation result is more accurate
This patent also does not relate to the determination method of pseudo-relative permeability
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experiment example 1
[0099] (1) Construction of numerical simulation models for fracture-cavity reservoirs under different combinations of cave and fracture characteristic parameters.
[0100] According to the target oilfield outcrop geological description, core observation, image logging interpretation results and seismic ant body attribute analysis, etc., determine the target oilfield cave scale, fracture parameters and spatial topology parameters, mainly including cave size, cave density, fracture density, fracture opening According to the above parameters, the deterministic modeling method was used to establish a numerical simulation model of fracture-cavity reservoirs with N sets of combinations of characteristic parameters of caves and fractures. The specific process operation diagram is as follows figure 1 shown. The above parameters are obtained by laser scanning the geological outcrops exposed on the earth's surface. For details, please refer to the method described in the patent applica...
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The invention discloses a determination method, a calculation method and a determination system for semi-filled fracture-vug reservoir quasi-relative permeability, which belong to the technical field of unconventional oil reservoir development in the petroleum industry. The determination method comprises the steps of constructing a fracture-vug reservoir oil-water two-phase flow process agent model for a target oil field, and predicting relative permeability parameters and fracture-vug reservoir indexes of the target oil field based on the fracture-vug reservoir oil-water two-phase flow process agent model, substituting the predicted value of the fracture-vug reservoir index, the actually measured value of the fracture-vug reservoir index and the predicted value of the relative permeability parameter of the target oil field into a target function capable of calculating errors, and adopting a genetic algorithm to iterate for multiple times until the calculation result of the target function reaches the minimum, so as to obtain the relative permeability of the target oil field, and outputting the corresponding predicted relative permeability parameter value at the moment, and substituting the relative permeability parameter value into the quasi-relative permeability expression to obtain the quasi-relative permeability of the semi-filled fracture-vug reservoir of the target oil field.
Description
technical field [0001] The invention belongs to the technical field of unconventional oil reservoir development in the petroleum industry, and in particular relates to a method for determining pseudo-relative permeability of a semi-filled fracture-cavity reservoir, a calculation method and a system for determining it. Background technique [0002] Carbonate reservoirs are one of the most important types of reservoirs in the world. This kind of reservoirs is widely distributed in the world and has huge oil and gas reserves. It occupies an important position in the discovered oil and gas fields in the world. According to statistics, the reserves of carbonate oil and gas reservoirs that have been discovered so far account for about 50% of the total oil and gas reserves in the world, and the production accounts for about 60%. Among them, fractured-vuggy reservoirs account for a large proportion of the total reserves of carbonate reservoirs, and the complex storage space determin...
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Login to View More IPC IPC(8): G06F30/20G06N20/20G06F30/18G06F113/08
CPCG06F30/20G06F30/18G06N20/20G06F2113/08
Inventor 胡文革陈勇谭涛郭臣解慧赵进惠建窦莲朱乐乐
Owner CHINA PETROLEUM & CHEM CORP