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Gas channeling prediction method for different CO2 flooding injection-production modes

A prediction method and model technology, which is applied in the directions of measurement, fluid extraction, earthwork drilling, etc., can solve problems such as early prediction and failure to consider the impact of differences, and achieve the effect of improving accuracy

Pending Publication Date: 2022-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention can also only be used to identify gas channeling after gas channeling occurs, and cannot be predicted in advance before gas channeling occurs, and it does not consider CO 2 Differential effects caused by different injection-production modes of flooding

Method used

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  • Gas channeling prediction method for different CO2 flooding injection-production modes
  • Gas channeling prediction method for different CO2 flooding injection-production modes
  • Gas channeling prediction method for different CO2 flooding injection-production modes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] Example of a CO 2 Gas channeling prediction method for flooding with different injection-production modes

[0036] The method includes the following steps:

[0037] Step 1. Component simulation of the original formation oil:

[0038] Perform high-pressure PVT phase state analysis test and chromatographic analysis on the original formation oil of the target reservoir to obtain all-hydrocarbon component data and basic physical property parameters of the original formation oil; the basic physical property parameters include viscosity, density, volume coefficient, compressibility coefficient, saturation pressure.

[0039] When simulating, set N 2 / C 1 as a component; CO 2As a single component; components with similar physical and chemical properties are fitted as an additive component. The number of the added components is 8-12.

[0040] The fluid requirement after fitting is less than 5% in error with the phase diagram of the full-component fluid.

[0041] Step 2. ...

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Abstract

The invention relates to the technical field of oilfield development, in particular to a gas channeling prediction method for different CO2 flooding injection-production modes. The method comprises the following steps: performing component simulation on original formation oil; according to an oil reservoir injection-production mode, a corresponding CO2 gas drive addition component output layout is established; carrying out oil reservoir field sampling, and carrying out gas phase component analysis on the obtained output gas; the obtained gas phase components of the output gas are compared on the corresponding CO2 drive gas addition component output chart, and when the content of the specific added component is increased or decreased, it is indicated that gas channeling occurs after a period of time. According to the method, differences caused by different injection-production modes are considered, the accuracy of gas channeling prediction is improved, and a basis is provided for injection-production regulation and control in the middle and later periods of CO2 flooding.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a CO 2 Gas channeling prediction method for different injection-production modes. Background technique [0002] CO 2 Flooding can both enhance oil recovery and reduce CO 2 Emissions are one of the most promising CO 2 field of application. However, due to CO 2 The mobility is much greater than that of crude oil, and the inherent heterogeneity of the reservoir leads to CO during gas flooding. 2 It tends to flow preferentially along the dominant permeability channel, forming gas channeling. The phenomenon of gas channeling has directly limited CO 2 With the further improvement of flood recovery, the identification and prediction of gas channeling has become the difficulty and focus of current research. due to CO 2 Flooding CO 2 The interaction mechanism with crude oil is complex, and is greatly affected by the reservoir, fluid physical properties, temperature ...

Claims

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Application Information

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IPC IPC(8): G06F30/28E21B47/10E21B43/16G06F113/08G06F119/14
CPCG06F30/28E21B47/10E21B43/164G06F2113/08G06F2119/14Y02P90/70
Inventor 郑文宽杨勇吕广忠张世明张传宝李友全王其伟王杰张东张勇
Owner CHINA PETROLEUM & CHEM CORP