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Apparatus and method for evaluating sediment wettability based on imbibition NMR

A technology of nuclear magnetic resonance and sedimentation, which is applied in the direction of analysis by nuclear magnetic resonance, measuring devices, material analysis through resonance, etc., can solve problems such as unavailability, evaluation of wettability, and easy dispersion of the skeleton

Active Publication Date: 2022-03-01
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the use of the above-mentioned wettability evaluation method, the object to be evaluated needs to be placed in water, and the hydrate deposit is relatively loose, and the skeleton is easy to disperse when placed in water. Therefore, the above-mentioned method cannot be used to evaluate the wettability

Method used

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  • Apparatus and method for evaluating sediment wettability based on imbibition NMR
  • Apparatus and method for evaluating sediment wettability based on imbibition NMR
  • Apparatus and method for evaluating sediment wettability based on imbibition NMR

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] like figure 1 As shown, the embodiment of the present invention provides a device for evaluating sediment wettability based on imbibition nuclear magnetic resonance, including: axial pressure loading equipment, holder 1 , temperature control equipment for confining pressure fluid, and nuclear magnetic resonance instrument 7 .

[0052] Wherein, the holder includes a sample part 2, a drip part 3 and a confining pressure part 4, the drip part 3 is located above the sample part 2, and the confining pressure part 4 is located around the sample part 2, The sample part 2 is used for placing samples, the drip part 3 is used for dropping liquid, and the confining pressure part 4 is used for injecting confining pressure liquid. The axial pressure loading device is located below the sample part 2 and is used to apply axial pressure to the sample part 2 . The dripping part 3 is connected with a gas inlet 5 , and the bottom end of the sample part 2 is connected with a gas outlet 6...

Embodiment 2

[0077] The embodiment of the present invention provides a method for evaluating sediment wettability based on imbibition nuclear magnetic resonance, including:

[0078] Carry out water droplet and oil droplet imbibition tests on two seabed sediment samples in the same formation, and measure the NMR T2 spectrum of the sample after each imbibition, and calculate the NMR T2 spectrum area;

[0079] Calculate the water volume or oil volume inhaled into the sample at the corresponding time according to the NMR T2 spectrum area at different times;

[0080] The macroscopic wetting index of the sample was calculated using the following formula:

[0081]

[0082]

[0083] In the formula, I w is the maximum water absorption volume per unit pore volume, I o is the maximum oil absorption volume per unit pore volume, WI w is the water wettability index, WI o is the oil wettability index;

[0084]

[0085]

[0086] In the formula, V wmax and V omax are the maximum wa...

specific example

[0101] In a specific example of the present invention, the device provided in Embodiment 1 is used to evaluate the wettability of seabed sediments, and the following steps are adopted:

[0102] Step 1. From the same hydrate formation, take two seabed sediment samples and process them into cylinders, and measure the mass and diameter of the two samples. d w and length l w , for dripping water and oil dripping tests, respectively.

[0103] In step 2, one of the samples is placed in the holder to ensure that the sample is within the range of the nuclear magnetic resonance. Apply confining pressure and axial pressure to the sample, and raise the temperature of the confining pressure fluid injected into the confining pressure part to 60-80°C through the confining pressure fluid temperature control equipment. Use a gas cylinder and a gas booster to continuously feed dry methane gas into the dripping part, and air-dry the sample until the nuclear magnetic resonance signal no long...

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Abstract

The invention discloses a device and method for evaluating sediment wettability based on imbibition nuclear magnetic resonance, comprising: axial pressure loading equipment, a holder, temperature control equipment for confining pressure fluid, and a nuclear magnetic resonance instrument; the holder includes The sample part, the drip part and the confining pressure part; the axial pressure loading device is used to load the axial pressure on the sample part; the sample part is located in the inspection chamber of the nuclear magnetic resonance instrument; The pressure pump communicates with the confining pressure part to provide confining pressure fluids of different temperatures to the confining pressure part. The present invention adopts the method of oil-water titration spontaneous imbibition, and by measuring the nuclear magnetic resonance T2 spectrum of the sample, it realizes the analysis of sediment samples under various complex pressure and temperature environments (including high pressure and low pressure, high temperature and low temperature, and pressure and temperature control). Any combination, rapid changes in pressure and temperature, etc.), the study of the occurrence and migration of the fluid infiltrated into the sample, and the evaluation of the wettability of water and oil.

Description

technical field [0001] The invention relates to the technical field of rock wettability evaluation, in particular to a device and method for evaluating sediment wettability based on imbibition nuclear magnetic resonance. Background technique [0002] Hydrate is an ice-like methane-water composite crystal formed under low temperature and high pressure. It mainly occurs on the seabed and high mountains. After decomposition, it can produce a large amount of methane gas and is an important clean energy. The study found that my country's hydrate resource reserves are abundant, more than twice that of traditional oil and gas and other fossil resources, which is of great significance for improving my country's energy import and export structure and reducing environmental pollution. The production of hydrate wells is often low, and the production declines rapidly after being put into production, which is related to its special gas-water seepage mechanism. According to the molecular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N24/08
CPCG01N13/00G01N24/081
Inventor 杨柳蔡建超张征延高敬威孟思炜徐建春
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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