Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for predicting solubility of CO2 in NaCl aqueous solution based on CPA state equation

An equation of state and aqueous solution technology, which is applied in the field of predicting the solubility of CO2 in NaCl aqueous solution based on the CPA equation of state, can solve the problems of low accuracy and narrow temperature and pressure range, and achieve the effect of high accuracy, low initial value requirements and the best prediction effect.

Pending Publication Date: 2021-10-22
SOUTHWEST PETROLEUM UNIV
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as low accuracy and narrow temperature and pressure range

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for predicting solubility of CO2 in NaCl aqueous solution based on CPA state equation
  • Method for predicting solubility of CO2 in NaCl aqueous solution based on CPA state equation
  • Method for predicting solubility of CO2 in NaCl aqueous solution based on CPA state equation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0131] Below in conjunction with accompanying drawing, technical solution of the present invention will be introduced in detail:

[0132] In this implementation example, using the established CPA-SRK-WS model, the CO 2 Solubility in sodium chloride solution was calculated and compared with experimental data. The parameters of the CPA-SRK-WS model were optimally fitted in a large range of temperature and pressure using the least square method, as shown in Table 1. Table 3 lists the H obtained from the regression of experimental data 2 O-NaCl system and CO 2 - Interaction parameter (D) values ​​for the NaCl system. For an overview of the calculation process, see figure 1 , first input temperature T, pressure P and composition parameter z i ; Then calculate the contrast temperature T according to the contrast state principle r , Contrast pressure P r , and use the Wilson formula to estimate the equilibrium constant (K i ) initial value; with K i Enter the material balanc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for predicting the solubility of CO2 in a NaCl aqueous solution based on a CPA state equation. On the basis of a CPA-SRK state equation, a WS mixing rule, an NRTL activity coefficient model, a material balance equation, a thermodynamic balance equation set and a miscible phase function, an inert association scheme more suitable for CO2 is selected, and a phase state simulation step-by-step iteration numerical calculation method is established. The method is high in calculation speed, high in precision and wide in application range, can guide development of the gas reservoir with high CO2 content and carbon capture and storage, and provides technical support for improving natural gas recovery efficiency and coping with global CO2 emission.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, aiming at 2 Natural gas reservoir development and carbon capture and storage (CCS) technology, proposed a method based on the CPA state equation to predict CO in NaCl aqueous solution 2 Solubility method. Background technique [0002] As we all know, CO 2 Experimental determination of solubility is time consuming and expensive. Therefore, thermodynamic models were developed on the basis of experimental data and phase equilibria to break through the limitations of experimental methods. Currently, high CO 2 Gas reservoir development and CO 2 None of the phase state modeling studies of sequestration considered CO 2 -The impact of formation water miscibility and ion content changes, which will lead to the dynamic prediction of the development index of this type of gas reservoir and the CO 2 There is inaccuracy in the study of dissolution mechanism ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G16C20/30G16C10/00G16C20/70G16C20/90
CPCG16C20/30G16C10/00G16C20/70G16C20/90
Inventor 卞小强何万春
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com