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
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Problems solved by technology

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

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  • 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

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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...

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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

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Application Information

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IPC IPC(8): G16C20/30G16C10/00G16C20/70G16C20/90
CPCG16C20/30G16C10/00G16C20/70G16C20/90
Inventor 卞小强何万春
Owner SOUTHWEST PETROLEUM UNIV
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