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Fundamental study of the effect of using carbon dioxide in methane hydrate development. Kentaro Fukuda Yujing Jiang Yoshihiko Tanahashi. Nagasaki University Geoenvironmental Lab. Background of Research. Methane Hydrate (MH). Now. Petroleum and Natural gas are main energy resources.

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Fundamental study of the effect of using carbon dioxide in methane hydrate development

Kentaro Fukuda

Yujing Jiang

Yoshihiko Tanahashi

Nagasaki University

Geoenvironmental Lab

background of research
Background of Research

Methane Hydrate (MH)

Now

Petroleum and Natural gas are main energy resources.

Limit of the quantity of resources

Future

The development of new energy resources

Methane Hydrate (MH)

background of research1
Background of Research

MH

A material that Methane’s molecule is surrounded in the crystallization of the caged Water’s molecule forms

Equilibrium conditions: Low temperature and High pressure

Distribution area

① Sediment of sea beds

② Eternal frozen ground area

Triangle:Methane’s moleculeBall:Water’s molecule

Crystal structure of MH

background of research2
Background of Research

Gathered MH(White ice)

The gathered MH in Niigata offing

Distribution area

1. The Nankai Trough

2. Kuril Islands

3. Sea of Okhotsk

4. Tataru Trough

5. Okushiri submarine ridge

6. West Tsugaru basin

The confirmation of existence of MH in sea area around Japan

The amount of the resource : About 7.4 trillions cubic meters

Equivalent to about 100 years of the amount of annual natural gas consumption in Japan(1999)

Possibility of supplying energy for long term in Japan

background of research3
Background of Research

MH has the possibility to become the next generation energy

However

Problem

The influence on sea beds in the production of MH (Buckling of winze, Landslide etc.)

The necessity of developing MH considering the environment problems

background of research4
Background of Research

The suggestion of developing MH with Carbon Dioxide

The formation of Carbon Dioxide Hydrate (CO2-Hyd)

Advantage

  • More stable than MH
  • Disposal of greenhouse gases
  • Low cost

Global environment problem

Energy problem

Solution at the same time

background of research5
Background of Research

CO2 injection

CO2 injection

Ocean

  • Maintenance of artificial roof
  • Immobilization of CO2

Construction of artificial roof

Upper layer

CO2-Hyd layer

CO2-Hyd layer

CO2-Hyd layer

Production of MH

Construction of artificial prop

MH layer

Stabilization of soft stratum

Lower layer

purpose of research
Purpose of Research
  • Evaluate the property by doing triaxial compression test on the specimen with CO2 gas and mixture gas (emphasizing the latter one)

Organization of Collaboration:Methane Hydrate lab, National Institute of Advanced industrial Science and Technology

  • Comparison of the strength on the simulated specimen with each of CO2-Hyd and MH

Evaluation of utilization possibility of CO2

sample manufacture
Sample Manufacture

Close-packed

Drain

Mold of pillar shape (Caliber:50mm, Height:100mm)

Water + Toyoura sand

Adjustment of the saturation

Freeze with refrigerator

sample set
Sample Set

Pressure Container

Set of Frozen sample

Triaxial Compression Test Apparatus

Set of Frozen sample

  • Installation of Rubber sleeve
  • Installation of lid of pressure container
  • Injection of antifreeze solution
formation of co 2 hyd
Formation of CO2-Hyd

Establishment of formation conditions

Control with outside computers

Pore pressure (Formation pressure) : 8MPa

Lateral pressure : 9, 10 , 12MPa

Temperature in the cell : 6, 2.5 ℃

Penetration of mixture gas in the void of the specimen

Adjustment of formation time

Formation of CO2-Hyd

triaxial compression test
Triaxial Compression Test

Test conditions

In situ conditions

Undrain conditions

Back pressure : 0MPa

Pore pressure : 8MPa

Lateral pressure : 9, 10, 12MPa

Temperature in cell : 6, 2.5℃

Water depth 700m

The layer with the thickness of 100m under see beds

Establishment of the conditions close to in-situ

Enforcement of loading test

decomposition of co 2 hyd
Decomposition of CO2-Hyd

Decomposition of CO2-Hyd by decompression

Measurement of the amount of CO2 gases with the gas meter

Calculation of CO2-Hyd saturation degree

The sample after decomposition

constitution of sample
Constitution of Sample

Gas

Gas

ガス

Vg

Vg

Pore volume

ガス

Hydrate

Hydrate

Vv

Vv

Water

ハイドレート

Vh

Water

Vw

Vw

CO2-Hyd saturation degree

V

V

Sand

Sand

Vs

標準砂

標準砂

Vs

Core manufacture

CO2-Hyd formation

stress strain relation mixture gas
Stress-Strain relation (mixture gas)

The influence of formation of Hydrate: small

Increase of the saturation degree of Sh than that in 6℃

The strength at the same level as N2

Increase of the strength

9MPa

deformation modulus
Deformation modulus

σ

σmax

σmax/2

ε50

ε

E50:Secant elastic modulus in axis difference stress 50 percent

σmax:Maximum axis difference stress

ε50:Strain in axis difference stress 50 percent

deformation modulus1
Deformation modulus

Lateral pressure 9MPa

→ Linear increase of deformation modulus

May depend on the saturation degree of Sh

formation conditions
Formation conditions

Concentration degree

CO2 gas, Methane → 100%

Mixture gas → The ratio of 50%of CO2 and N2

maximum axis difference stress
Maximum axis difference stress

Linear strength increase

Mixture gas: The strength is high.

The strength at the same level with MH is shown although their conditions are different.

maximum axis difference stress1
Maximum axis difference stress

The possibility that N2 was mixed in the hydrate

The strength at the same level with MH despite at low saturation degrees

conclusion
Conclusion

Evaluation of the mechanical property of CO2-Hyd

Strength

Formation pressure

Low

High

Low

High

CO2 gas

Mixture gas

Drain conditions

Strength

MH

Mixture gas

Drain

Undrain

Strength at the same level

The utilization possibility of CO2 is confirmed

future problem
Future problem
  • Applying the triaxial compression test under the conditions more close to in-situ
  • Elucidation of the change of hydrate saturation degree by the influence of Nitrogen when using the mixture gas

Realization of MH development by using CO2