| Citation: |
Qiang Chen, Gao-wei Hu, Neng-you Wu, Chang-ling Liu, Qing-guo Meng, Cheng-feng Li, Jian-ye Sun, Yan-long Li, 2020. Evaluation of clayed silt properties on the behavior of hydrate production in South China Sea, China Geology, 3, 362-368. doi: 10.31035/cg2020050
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Evaluation of clayed silt properties on the behavior of hydrate production in South China Sea
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Abstract
Gas hydrate is one kind of potential energy resources that is buried under deep seafloor or frozen areas. The first trial offshore production from the silty reservoir was conducted in the South China Sea by the China Geological Survey (CGS). During this test, there were many unique characteristics different from the sand reservoir, which was believed to be related to the clayed silt physical properties. In this paper, simulation experiments, facilities analysis, and theoretical calculation were used to confirm the hydrate structure, reservoir thermo-physical property, and bond water movement rule. And the behavior of how they affected production efficiency was analyzed. The results showed that: It was reasonable to use the structure I rather than structure II methane hydrate phase equilibrium data to make the production plan; the dissociation heat absorbed by hydrate was large enough to cause hydrate self-protection or reformation depend on the reservoir thermal transfer and gas supply; clayed silt got better thermal conductivity compared to coarse grain, but poor thermal convection especially with hydrate; clayed silt sediment was easy to bond water, but the irreducible water can be exchanged to free water under high production pressure, and the most obvious pressure range of water increment was 1.9–4.9 MPa.
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References
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Qiang Chen, Gao-wei Hu, Neng-you Wu, Chang-ling Liu, Qing-guo Meng, Cheng-feng Li, Jian-ye Sun, Yan-long Li, 2020. Evaluation of clayed silt properties on the behavior of hydrate production in South China Sea, China Geology, 3, 362-368. doi: 10.31035/cg2020050
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Figure 1.
The measurement apparatus for structure and component of gas hydrate. a–microscopic Raman spectrometer; b–gas chromatograph.
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Figure 2.
The structure I/II gas hydrate phase equilibrium data.
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Figure 3.
Raman spectrum of gas hydrate from the Shenhu area, South China Sea.
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Figure 4.
Apparatus of hydrate dissociation and thermal conductivity measurement. a–high-pressure differential scanning calorimetry; b–hydrate thermal-physical simulation apparatus.
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Figure 5.
HP DSC heat flow curve of methane hydrate dissociation.
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Figure 6.
The relationship between the thermal conductivity and hydrate saturation of Shenhu samples.
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Figure 7.
The metal rotor of the centrifuge.
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Figure 8.
Free water and bound water variation trend under different pressure.