Experimental device researching influence of formation water with high degree of mineralization on CO2 flooding

A high-salinity, experimental device technology, applied in the field of displacement, can solve the problems of unsatisfactory vacuum performance of the device, low accuracy of collected experimental data, lack of corrosion resistance and oleophobicity, etc. Long life, reduced permeability effect

Inactive Publication Date: 2017-06-30
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The designed fluid volume measurement device has a simple structure, and only needs to add four valves, two conduits, two pressure measuring instruments, a collection container, a buffer container and a semi-permeable The separator is sufficient, but the accuracy of the experimental data collected by the device is not high, and the corrosion resistance and oleophobicity are lacking, and the vacuum performance of the device during the displacement process is not ideal

Method used

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  • Experimental device researching influence of formation water with high degree of mineralization on CO2 flooding
  • Experimental device researching influence of formation water with high degree of mineralization on CO2 flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, a study on the effect of high-salinity formation water on CO 2 The experimental device of flooding effect includes gas cylinder 1, rock core holder 10, gas-liquid separation device 8, gas cylinder 1 is connected with piston container 3, the top of piston container 3 is connected with back pressure valve 71 and pressure gauge 4, piston container 3 The bottom is connected to the ISCO pump 2, the pressure gauge 4 is connected to the core holder 10, the outlet end of the core holder 10 is connected to the gas-liquid separation device 8, and the gas-liquid separation device 8 is connected to the host computer 9 through the gas flow meter 41.

[0022] The back pressure valve 71 is connected with the back pressure pump 62, which will not cause the back pressure to drop and the back pressure fluctuation is small, effectively keeping the back pressure at the injection end of the rock core 5 constant.

[0023] The side of the core holder 10 is connected w...

Embodiment 2

[0034] like figure 1 As shown, a study on the effect of high-salinity formation water on CO 2 The experimental device of flooding effect includes gas cylinder 1, rock core holder 10, gas-liquid separation device 8, gas cylinder 1 is connected with piston container 3, the top of piston container 3 is connected with back pressure valve 71 and pressure gauge 4, piston container 3 The bottom is connected to the ISCO pump 2, the pressure gauge 4 is connected to the core holder 10, the outlet end of the core holder 10 is connected to the gas-liquid separation device 8, and the gas-liquid separation device 8 is connected to the host computer 9 through the gas flow meter 41.

[0035] The back pressure valve 71 is connected with the back pressure pump 62, which will not cause the back pressure to drop and the back pressure fluctuation is small, effectively keeping the back pressure at the injection end of the rock core 5 constant.

[0036] The side of the core holder 10 is connected w...

Embodiment 3

[0047] like figure 1 As shown, the core holder 10 in the device is made of 316 stainless steel, the diameter of the core 5 is 25mm, the length of the core 5 is 25-35mm, and the maximum pressure is 70MPa. The inner cavity of the core holder 10 is provided with a sealed lead sleeve. A sealing liquid is injected into the outside of the sealed lead sleeve to apply a uniform confining pressure (ring pressure) to the rock core 5 to ensure that no leakage occurs when the test fluid passes through the rock core 5 . The confining pressure is dynamically tracked by the displacement pump, and generally the confining pressure is about 2MPa higher than the displacement pressure. In the device, lead sleeves are used to replace commonly used rubber sleeves, which can effectively prevent supercritical CO 2 Corrosion to the gland. The displacement pump adopts ISCO pump 2. The double cylinder of ISCO pump 2 can displace continuously, and the injection volume is accurate and the displacement p...

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Abstract

The invention provides an experimental device researching influence of formation water with a high degree of mineralization on CO2 flooding. The experiment device comprises a gas cylinder, a core holding unit and a gas-liquid separating device. The gas cylinder is connected to a piston container, the top of the piston container is connected to a back-pressure valve and a pressure gage, the bottom of the piston container is connected to an ISCO pump, the pressure gage is connected to the core holding unit, the outlet end of the core holding unit is connected to the gas-liquid separating device, and the gas-liquid separating device is connected to an upper computer through a gas flowmeter. The back-pressure valve is connected to the back-pressure valve, the side face of the core holding unit is connected to a circular pressing pump and the suction lift is high, the outlet of the core holding unit is connected to the back-pressure valve, and the back-pressure valve is connected to a back-pressure pump. The designed device can compare changes of core permeability after and before CO2 flooding, porosity, pore structures, contents of core minerals, surface shapes of the cores, masses of the core and the recovery rates and research influence of CO2 flooding on reservoir physical property and development parameters.

Description

technical field [0001] The invention belongs to the technical field of displacement, and in particular relates to a method for studying the effect of high-salinity formation water on CO 2 Experimental setup for flooding effects. Background technique [0002] With the continuous development of oil and gas field development, the crude oil reserves of high-quality reservoirs are becoming less and less, and the new reserves currently explored are mainly low-permeability reservoirs, and most of them are ultra-low-permeability reservoirs and ultra-low-permeability reservoirs. For ultra-low permeability reservoirs and specific permeability reservoirs, conventional water injection development has the problem of "no injection, no production". carbon dioxide (CO 2 ) has the advantages of good fluidity in the formation, can greatly expand the volume of crude oil, greatly reduce the viscosity of crude oil, reduce the interfacial tension of oil and gas, and have miscibility with crude ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24E21B43/22
CPCG01N33/24E21B43/164
Inventor 赵东锋殷丹丹朱根民竺柏康王北福高良军
Owner ZHEJIANG OCEAN UNIV
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