Method and device for predicting CO2 miscible flooding effected oil well gas channeling time of low-permeability reservoir

A time prediction, miscible flooding technology, applied in wellbore/well components, earthwork drilling, climate sustainability, etc. precise effect

Active Publication Date: 2020-12-11
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only be used for the CO 2 It is impossible to accurately predict the gas channeling time by making judgments in the displacement st

Method used

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  • Method and device for predicting CO2 miscible flooding effected oil well gas channeling time of low-permeability reservoir
  • Method and device for predicting CO2 miscible flooding effected oil well gas channeling time of low-permeability reservoir
  • Method and device for predicting CO2 miscible flooding effected oil well gas channeling time of low-permeability reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1; A low-permeability reservoir CO 2 A method for predicting gas channeling time of a miscible flooding effective oil well, the prediction method includes the following steps:

[0077] S10: Use CMG numerical simulation software to simulate to obtain an oil field model, the parameters of the oil field model include the oil production rate of the oil well and the CO in the produced gas. 2 The mole fraction of the oil well is used to analyze the oil production rate and the CO in the produced gas 2 The corresponding relationship between the two mole fractions and the fluid flow stage of each reservoir;

[0078] In the specific implementation, the CMG numerical simulation software was used to simulate an oil well in the G69 block, and the following results were obtained: figure 1 Schematic diagram of the different flow stages of a G69 well model shown. And through the simulation of the oil production rate of a certain oil well in block G69 and the mole fraction of...

Embodiment 2

[0119] Example 2; A low permeability oil reservoir CO 2 A device for predicting gas channeling time in miscible flooded wells, based on a CO 2 A method for predicting the gas breakthrough time of a miscible flooding-effective oil well is provided with a computer device, which includes a storage and a high-speed processor.

[0120] A computer program is stored in the storage, and the computer program comprises an effective oil well dynamic analysis module 1, an effective oil well gas channeling early warning module 2, a gas channeling time influencing factor analysis module 3, a gas channeling time prediction model training module 4 and Development well gas channeling time prediction module 5.

[0121] Effective oil well performance analysis module 1 analyzes the production performance of effective oil wells, and divides low permeability oil reservoirs into CO according to the limit thresholds of indicators such as oil production rate and CO2 mole fraction in produced gas. 2 ...

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Abstract

The invention relates to the technical field of oilfield development, in particular to a method and a device for predicting CO2 miscible flooding effected oil well gas channeling time of a low-permeability reservoir. A gas channeling early warning chart diagram is established through CMG numerical simulation software simulation, the gas channeling time of an oil well is determined through a Kmeansclustering algorithm, the influence degree of various influence factors of the oil well is judged through a partial correlation analysis method, the influence factors with the small influence degreeare removed, and a gas channeling time sample library is obtained; and a CO2 miscible-phase flooding well gas channeling time prediction model is established by using a multiple linear regression model algorithm. The gas channeling time of the oil well to be measured can be directly and accurately predicted by substituting influence factor data of the oil well to be measured into the CO2 miscible-phase flooding oil well gas channeling time prediction model, complex simulation on the oil well to be measured by using CMG numerical simulation software is skipped, and prediction on a development well is more accurate and faster. Influence factors with small influence degrees are eliminated so that the method is more instructive to the production field of the oil well.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a low-permeability oil reservoir CO 2 Method and device for predicting gas channeling time of miscible flooding effective oil wells. Background technique [0002] CO 2 Enhanced oil recovery technology (CO 2 Enhance oil recovery, CO for short 2 -EOR, the same below) is the most effective tertiary oil recovery method for low-permeability reservoirs because of its viscosity-reducing effect, swelling and energy-enhancing effect on crude oil, elimination of interfacial tension, and effective displacement of residual oil in micro-pore throats. one. CO 2 -EOR technology has been widely used in low permeability reservoirs, tight sandstone reservoirs, shale oil / gas reservoirs, coalbed methane reservoirs and other reservoirs where water flooding cannot achieve good stimulation effects. Through a large number of indoor studies and numerical simulation studies, the resear...

Claims

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Application Information

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IPC IPC(8): G06F30/27G06F30/28G06K9/62E21B43/16G06F111/10G06F119/12G06F119/14
CPCG06F30/27G06F30/28E21B43/164G06F2111/10G06F2119/12G06F2119/14G06F18/23213Y02A10/40
Inventor 孙致学闵成唐建信梁珀任允鹏赵梓平牛祥玉姜宝胜贾艳平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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