Method for equivalently representing threshold pressure gradients in low-permeability oil reservoir numerical simulation

A technology for starting pressure gradient and numerical simulation, which is used in electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of improving prediction accuracy

Active Publication Date: 2017-09-22
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology

Therefore, it is required to quantitatively characterize the start-up pressure gradient in the process of predicting the development index of low-permeability reservoirs and studying the distribution of remaining oil, but the impact of this parameter is not considered in the current reservoir numerical simulation commercial software

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  • Method for equivalently representing threshold pressure gradients in low-permeability oil reservoir numerical simulation
  • Method for equivalently representing threshold pressure gradients in low-permeability oil reservoir numerical simulation
  • Method for equivalently representing threshold pressure gradients in low-permeability oil reservoir numerical simulation

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] The present invention provides an equivalent characterization method for start-up pressure gradient in numerical simulation of low-permeability reservoirs, comprising the following steps:

[0032] 1) Obtain the quantitative relationship between reservoirs with different permeability and threshold pressure gradient through experiments.

[0033] Specifically, the pressure difference-flow method can be used. The basic principle is: after the different displacement pressure differences are stabilized, measure the flow rate of the fluid passing through the core, draw the relationship between flow rate and pressure gradient, and obtain the threshold pressure gradient from the regression curve (such as figure 1 shown). The specific steps of the experiment include: ① In the Soxhlet extractor, the rock sample used in the experiment was extracted for 7 ...

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Abstract

The invention relates to a method for equivalently representing threshold pressure gradients in low-permeability oil reservoir numerical simulation. The method comprises the following steps of: 1) obtaining a quantitative relationship between different-permeability reservoirs with and threshold pressure gradients through an experiment; 2) carrying out quantitative calculation on oil reservoir non-homogeneity; 3) setting numerical simulation partitions; and 4) carrying out threshold pressure gradient assignment on meshes formed after the partition setting: 1, reading a permeability value of each mesh, and carrying out assignment on the threshold pressure gradient of each mesh according to the relationship between the permeability and the threshold pressure gradients in the step 1), and 2, setting threshold pressure gradients of the partitions, and for a certain partition, carrying out assignment on a threshold pressure gradient generated in a fluid flow-out process and carrying out carrying out assignment on a threshold pressure gradient generated in a fluid flow-in process.

Description

technical field [0001] The invention relates to a start-up pressure gradient equivalent characterization method in low-permeability oil reservoir numerical simulation, belonging to the technical field of oil and gas development. Background technique [0002] Low-permeability oilfields refer to oilfields with low reservoir permeability, low abundance, and low single-well productivity. Low permeability oil and gas fields are of great significance in oil and gas development in my country. The low-permeability oil and gas fields discovered in my country account for more than half of the newly discovered oil and gas reservoirs, and the production capacity construction scale of low-permeability oil and gas fields accounts for more than 70% of the total production capacity construction scale of oil and gas fields. Low-permeability oil and gas fields have become the main battlefield of oil and gas development and construction. During the development of low-permeability reservoirs, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 王帅田冀朱国金谭先红丁祖鹏梁斌李南张利军曾杨郑强
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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