Numerical simulation method for replacing gas-driven component model

A numerical simulation and component model technology, applied in the fields of earthwork drilling, electrical digital data processing, special data processing applications, etc., can solve the problems of reduced computing speed and inability to effectively achieve mixing
CN107066672AActive Publication Date: 2017-08-18CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
Publication Date
2017-08-18

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Abstract

The invention relates to a numerical simulation method for replacing a gas-driven component model. The method comprises the following steps of: carrying out PVTi fitting on a target block fluid to obtain PVTi fitted fluid property data; establishing component mechanism models under different permeation rates, and obtaining change rules of a mixed-phase area during oil deposit gas-driven development under the different permeation rates; building a practical component model according to the PVTi fitted fluid property data; obtaining a block practical numerical simulation model according to the change rules of the mixed-phase area during the oil deposit gas-driven development under the different permeation rates; adjusting mixed-phase coefficients in the block practical numerical simulation model to ensure that the differences between the capacity indexes and pressure indexes of the practical component and the block practical numerical simulation model are not higher than 10%, and obtaining reasonable mixed-phase coefficient distribution of a target block; and building a Todd-longstaff practical model, carrying out calculation in the mixed-phase area by using a Todd-longstaff algorithm, and carrying out calculation outside the mixed-phase area by using a common black oil algorithm.
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Description

technical field

[0001] The invention belongs to the technical field of gas drive oilfield development, in particular to a numerical simulation method for replacing a gas drive component model. Background technique

[0002] Gas flooding is one of the important tertiary oil recovery technologies that have been formed in the world. There are many types of gas sources for gas drive, including CO 2 , hydrogen, air, natural gas and flue gas, etc. The mechanism of gas flooding is very complicated. While replenishing energy, a part of the gas can also effectively react physically or chemically with formation crude oil, thereby effectively improving oil displacement efficiency and swept volume. This phenomenon is called miscible, so gas flooding includes miscible drive and immiscible drive.

[0003] For gas flooding development methods that can have miscible interactions with formation crude oil, component models are generally used for simulation. The component model can accurate...

Claims

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