Method and system for analyzing water-drive remaining oil of tight sandstone reservoir

A technique for tight sandstone reservoirs and analysis methods, which is applied in the field of water-flooding remaining oil analysis of tight sandstone reservoirs, can solve the problems of inaccurate and incomplete oil reservoir prediction, quantitative analysis of remaining oil without water-flooding oil, etc. Effects of Accuracy and Reservoir Recovery

Active Publication Date: 2021-06-11
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0004] However, the above-mentioned studies on remaining oil are mainly conducted from a qualitative point of view, and no quantitative analysis has been done on the remaining oil in water flooding.
As a result, reservoir prediction is imprecise and incomplete

Method used

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  • Method and system for analyzing water-drive remaining oil of tight sandstone reservoir
  • Method and system for analyzing water-drive remaining oil of tight sandstone reservoir
  • Method and system for analyzing water-drive remaining oil of tight sandstone reservoir

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Embodiment approach

[0044] The embodiment of the present invention provides a method and system for analyzing remaining oil in tight sandstone reservoir water flooding. The method includes: obtaining core scanning slices in the process of water flooding oil; performing logical operations on the water phase of the core scanning slices to obtain different water flooding Spatial distribution of water and oil in different water flooding states; use the spatial distribution of water and oil in different water flooding states, establish a water flooding remaining oil analysis model based on curve similarity, calculate the water flooding remaining oil analysis model, and obtain the fluid distribution difference in the core pore space; calculate according to the model As a result, the distribution characteristics of the remaining oil in the core samples during the displacement process were analyzed, and the distribution characteristics were used for reservoir prediction.

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Abstract

The invention discloses a method and system for analyzing water-drive remaining oil of a tight sandstone reservoir. The method comprises the steps: carrying out logical operation on a water phase of a core scanning slice in the water flooding process to obtain water-oil space distribution in different water flooding states; establishing a water-drive remaining oil analysis model based on curve similarity by utilizing water-oil space distribution in different water-drive states to obtain fluid distribution difference in a core pore space; analyzing the distribution characteristics of the remaining oil in the core sample according to the fluid distribution difference in the core pore space; and predicting the oil reservoir recovery ratio by using the distribution characteristics. According to the water drive remaining oil analysis method provided by the invention, based on the digital core, the remaining oil formation mechanism and the dynamic change process are quantitatively analyzed from the pore scale, and the oil reservoir evaluation precision and the oil reservoir recovery rate can be improved.

Description

technical field [0001] The invention belongs to the fields of evaluation of unconventional oil and gas reservoirs and digital rock physics, and in particular relates to a method and system for analyzing remaining oil in water drive of tight sandstone reservoirs. Background technique [0002] Crude oil is one of the important energy sources. At present, it is increasingly necessary to adopt advanced and low-cost development technologies to enhance oil recovery. The enhanced oil recovery technology based on water flooding is a commonly used stimulation method, but the investment cost is usually high. Therefore, it is necessary to use petroleum engineering methods and numerical simulations to describe the fluidity and distribution characteristics of oil, and to carry out reservoir analysis. Only by historical simulation and forecasting can a development plan be reasonably designed. However, due to the complex pore structure and microscopic distribution of oil in tight sandston...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N23/046G01M10/00
CPCG01N15/088G01N15/082G01N23/046G01M10/00Y02A10/40
Inventor 任大忠刘雪超董凤娟杨甫田涛
Owner XI'AN PETROLEUM UNIVERSITY
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