System and method for monitoring carbon dioxide migration and geological sequestration on line by using nuclear magnetic resonance technology

Abstract

The invention relates to the technical field of spatial migration analysis of carbon dioxide in a geological reservoir, and discloses a system and a method for monitoring carbon dioxide migration and geological sequestration on line by using a nuclear magnetic resonance technology. The system for monitoring carbon dioxide migration and geological sequestration on line by using the nuclear magnetic resonance technology comprises a rock core bidirectional displacement unit, a temperature and pressure integrated control unit and a nuclear magnetic resonance on-line monitoring data processing unit, the method comprises the following steps: saturating formation water in a rock core, calculating the permeability of the rock core, injecting compressed carbon dioxide in the forward direction, soaking, injecting formation water in the reverse direction, and monitoring and collecting nuclear magnetic resonance signals of fluid in the rock core. By adopting the system and the method provided by the invention, the water content of pores with different pore diameters of a rock core in different fluid injection stages can be intuitively observed, and the migration and distribution data of carbon dioxide and formation water in a reservoir can be calculated in real time, and quantitative and accurate measurement and description of microscopic pore channels and positions related to specific migration and distribution of carbon dioxide and formation water in a reservoir are realized.

Description

technical field [0001] The invention relates to the technical field of spatial migration analysis of carbon dioxide in geological reservoirs, in particular to a system and method for on-line monitoring of carbon dioxide migration and geological storage using nuclear magnetic resonance technology. Background technique [0002] Since the industrial revolution, the rapid development of science and technology and the acceleration of industrialization have greatly improved the living standards of human beings. However, with the development of society, the deterioration of the natural environment is becoming more and more serious. The global warming caused by the greenhouse gases produced by the combustion of fossil energy such as coal and oil has become a major challenge facing mankind in the 21st century. Among the various greenhouse gases emitted, carbon dioxide accounts for about 65% of the total greenhouse gases and is the main greenhouse gas. The more man-made greenhouse ga...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the low degree of stratum simulation reduction, poor applicability, and scope of application in the existing spatial migration analysis technology of carbon dioxide in geological reservoirs Narrow and difficult to achieve real-time signal monitoring of the microscopic pores and positions involved in the specific migration and distribution of carbon dioxide and formation water in the reservoir, providing a system and method for online monitoring of carbon dioxide migration and geological storage using nuclear magnetic resonance technology , the system uses nuclear magnetic resonance technology to monitor carbon dioxide migration and geological storage on-line. On the basis of objectively reconstructing the flow conditions of formation core samples in the in-situ environment of deep formations, it can realize the detailed analysis of carbon dioxide and formation water in the reservoir. The real-time monitoring of the migration signal, based on the measured signal, realizes the quantitative and accurate measurement and description of the microscopic pores and positions involved in the specific migration and distribution of carbon dioxide and formation water in the reservoir, providing a basis for the relevant mechanisms and processes in the process of carbon dioxide sequestration. Further optimization of timing engineering parameters in the process of carbon dioxide geological storage, including carbon dioxide injection amount, carbon dioxide injection speed, carbon dioxide injection timing, soaking time, flowback speed, flowback pressure difference, flowback liquid volume, etc., provides reliable data support

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