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Application of mri in situ measurement of co in reservoir temperature and pressure 2 - Apparatus and method for convective mixing of brine

An in-situ measurement and reservoir technology, applied in the field of multiphase flow, can solve problems such as difficulty in carrying out experiments, and achieve the effect of real imaging and enhanced image contrast.

Active Publication Date: 2021-12-31
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0006] The present invention solves the existing problem of CO in porous media 2 -There are limitations in the convective mixing measurement process of the brine fluid system and it is difficult to carry out related experiments. A method of in-situ measurement of CO under temperature and pressure in reservoirs using MRI is proposed. 2 - Apparatus and method for convective mixing of brine

Method used

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  • Application of mri in situ measurement of co in reservoir temperature and pressure <sub>2</sub> - Apparatus and method for convective mixing of brine

Examples

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Embodiment 1

[0039] In situ measurement of CO in BZ02 glass sand using MRI at 38°C and 8.5 MPa 2 - Saline convective mixing process.

[0040] Step 1: fluid preparation;

[0041] Prepare brine containing 0.5 wt% manganese chloride and 2.5 wt% sodium chloride as a light fluid, and a small amount of manganese chloride added to it can enhance the contrast of MRI images, and record the light fluid at this time F a The density is ρ a ； Prepare a 3.0 wt% NaCl brine solution and fully dissolve CO into the 3.0 wt% NaCl solution at 8.5MPa / 38°C 2 As heavy fluid, record heavy fluid F b The density is ρ b , record the density difference between the two solutions at this time as ∆ ρ = ρ b -ρ a ;

[0042] Step Two: Light Fluid F a Saturated porous media;

[0043] Evacuate and use brine containing 0.5 wt% manganese chloride and 2.5 wt% sodium chloride at the experimental pressure F a Saturate the porous medium, stand still for a period of time to ensure that the glass sand is soaked b...

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Abstract

In situ measurement of CO in reservoirs under temperature and pressure using MRI 2 -A device and method for convective mixing of brine, belonging to the technical field of multiphase flow. This method is suitable for CO2 under real reservoir conditions 2 / ScCO 2 ‑Visual measurement of convective mixing in brine systems, a breakthrough in CO 2 ‑Limitations of brine fluid systems that are difficult to observe in 3D porous media. The method begins by preparing brine containing manganese chloride as a light fluid to enhance image contrast. Simultaneous production of saturated CO 2 brine as a heavy fluid, the density difference between the two fluids is only the dissolved CO 2 produce. The autoclave filled with porous media is fully saturated with light fluid first, and then the heavy fluid is injected from the bottom to replace part of the light fluid. Finally, the high-pressure reactor was inverted and placed in the MRI chamber to continuously collect images, during which the CO under the experimental pressure 2 Continue to dissolve in heavy fluid, finally get CO 2 ‑Grayscale image of brine convective mixing for observation and quantitative analysis at laboratory scale.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow, and relates to an in-situ measurement of CO under temperature and pressure in reservoirs using MRI. 2 - Device and method for convective mixing of brine. Background technique [0002] CO 2 A large amount of emissions cause global warming and the intensification of the greenhouse effect. CO 2 Geological storage has great potential as a way to achieve emission reductions. million tons of CO 2 After being stored in a high-pressure pipeline to a designated storage area, the CO injected into the saline layer will 2 Due to the existence of buoyancy and other reasons, they continue to migrate upwards, and eventually a large amount of gas accumulates at the bottom of the caprock. This part of CO 2 Accumulate and continuously diffuse and dissolve in the in-situ brine, and finally generate a density difference with the brine to promote convection. This process effectively accelerates the mix...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08G01N1/38
CPCG01N24/081G01N1/38
Inventor 宋永臣王思佳蒋兰兰刘瑜成祖丞徐楠赵越超
Owner DALIAN UNIV OF TECH
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