Experimental investigation on the permeability of a hydrate-bearing reservoir considering overburden pressure

Gao, Yonghai; Chen, Ye; Chen, Litao; Ji, Guomin; Wang, Kai; Sun, Baojiang

doi:10.1016/j.fuel.2019.01.166

Cited by 49 publications

(15 citation statements)

References 15 publications

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“…The pore size formed between aggregate structures is much larger than that of soil particles, which provides an ideal channel for gas phase fluid, thus increasing the permeability. Gao et al found that the presence of free water was not favorable to the permeability of the reservoir, 49,50 but no free water flow was detected during the measurement in this experiment, indicating that the water contained in the sample was not free water. It can also be seen in Figure 5 that the linear relationship between initial water saturation and initial permeability in the early stage is not obvious, and there are two possible explanations: one was that the amount of bound water in the sample was relatively small and the phenomenon of clusters was not obvious; the other was that the pore structure inside the sample was not controllable although the porosity of the sample was the same.…”

Section: Resultsmentioning

confidence: 56%

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

et al. 2021

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Marine methane hydrate is considered to be one of the future energy sources with the most potential due to its tremendous reserves. Permeability is a key parameter affecting the recovery efficiency and gas recovery of gas hydrate. We studied the dependence of gas permeability on hydrate saturation and effective stress using remolded core from the South China Sea. The results show that, with increasing hydrate saturation, the gas permeability first decreases, then increases, and decreases finally, which may be due to the combined effect of the growth habit of hydrates in the pores, the interaction between hydrates and particles, and the effect of effective stress. The formation and decomposition of hydrates in the sediment will cause a decrease in gas permeability. When hydrate saturation is 40.66%, the gas permeability decreases by 13 times due to hydrate formation. The gas permeability presents an approximate linear negative relationship with effective stress. The presence of hydrate significantly reduces the stress sensitivity of the sediment. A stress-sensitive critical saturation between 36.60 and 40.66% makes the ratio of permeability change to effective stress change close to a constant. This work bridges the gap of gas permeability of marine sediments between laboratory samples and natural sediments, providing reliable seepage parameters for the numerical simulation of marine hydrate exploration.

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Section: Resultsmentioning

confidence: 56%

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

et al. 2021

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“…With increasing ECP, the microfractures in the sample would preferentially close, resulting in a significant decrease in porosity and permeability. At larger ECP values, the microfractures and pore throats of the rock are already considerably compressed and so as the ECP increases further, there is a slower decrease in porosity and permeability 24,25 …”

Section: Resultsmentioning

confidence: 99%

“…At larger ECP values, the microfractures and pore throats of the rock are already considerably compressed and so as the ECP increases further, there is a slower decrease in porosity and permeability. 24,25…”

Section: Core Flooding Experimentsmentioning

confidence: 99%

The effects of porosity and permeability changes on simulated supercritical CO₂ migration front in tight glutenite under different effective confining pressures from 1.5 MPa to 21.5 MPa

Myers

et al. 2020

Greenhouse Gases

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Depending on rock pore compressibility, a change in effective confining pressure (ECP) can have a significant influence on supercritical CO 2 (SC-CO 2) migration characteristics in natural reservoirs. In this study, a tight glutenite sample was used to conduct porosity/permeability measurements under different ECPs of 1.5, 5.5, 9.5, 13.5, 17.5 and 21.5 MPa. Then a SC-CO 2 drainage core flooding experiment, which was monitored using nuclear magnetic resonance (NMR) technique, was conducted at an ECP of 5.5 MPa. Measurement results show that the porosity and permeability of the sample were comparatively low (at an ECP of 1.5 MPa, 8.3% and 2.4 mD, respectively). With increasing ECP, the porosity/permeability decreased rapidly initially then more slowly at the larger ECP value. NMR results shows that SC-CO 2 preferentially displaced water creating flow channels inside the sample. At SC-CO 2 breakthrough, the average residual water saturation was 69.86%. Following breakthrough, SC-CO 2 continued to displace the water creating more substantial flow channels until they were sufficient to transport the SC-CO 2 at the fixed flow rate, resulting in a residual water saturation of 42.72%. A two-dimensional computational model was then established based on these experimental results to simulate the fluid behaviors at an ECP of 5.5 MPa, and then the model was

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“…Controlling the hydrate formation process, the permeability of the model was calculated under different hydrate saturations and compared with results from other studies, ,− as shown in Figure . When there was no hydrate generated in the throats (saturation of 0), the flow channels were unobstructed, and the pressure difference between inlet and outlet was so small that it was even close to the accuracy limits of the pressure gauge.…”

Section: Analysis Of Experimental Resultsmentioning

confidence: 99%

Simulation and Observation of Hydrate Phase Transition in Porous Medium via Microfluidic Application

Chen

Sun

Chen

et al. 2019

Ind. Eng. Chem. Res.

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The gas–liquid–solid phase transition of hydrates is complex and has effects that are coupled with the heat-mass transfer in reservoirs; thus, this phase transition is related to the determination of flow assurance and production efficiency. The microfluidic technology applied in this research can simulate a porous medium and is an alternative to the conventional sand-packing approach, encompassing real characteristics of interfaces between multiple phases, reducing the randomness of pore shape, and mastering the distribution of flow channels. The hydrate phase transition was observed directly, while the relationship between the hydrate saturation and the permeability was analyzed. The entire experimental cycle was greatly shortened and was performed at lower cost and with more convenient operation than traditional sand-packing methods. The results indicate that hydrate saturation is negatively correlated with permeability. Considering the properties of etched throats, the newly generated particles can reduce the model permeability greatly at the beginning of the hydrate formation and can ultimately block the flow channels. The detailed information presented in this study indicated that, at the initial stage of dissociation, hydrate blocks not only transformed into water and gas but also decomposed into small pieces. Gas–liquid interfaces first appeared around the hydrate block edges, and there were shrinkage cavities on the hydrate block surface during the dissociation. After complete dissociation of the hydrate, bubbles and water drops were found left in the phase of each other nearby the throat wall.

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Experimental investigation on the permeability of a hydrate-bearing reservoir considering overburden pressure

Cited by 49 publications

References 15 publications

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

The effects of porosity and permeability changes on simulated supercritical CO₂ migration front in tight glutenite under different effective confining pressures from 1.5 MPa to 21.5 MPa

Simulation and Observation of Hydrate Phase Transition in Porous Medium via Microfluidic Application

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Experimental investigation on the permeability of a hydrate-bearing reservoir considering overburden pressure

Cited by 49 publications

References 15 publications

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

The effects of porosity and permeability changes on simulated supercritical CO2 migration front in tight glutenite under different effective confining pressures from 1.5 MPa to 21.5 MPa

Simulation and Observation of Hydrate Phase Transition in Porous Medium via Microfluidic Application

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The effects of porosity and permeability changes on simulated supercritical CO₂ migration front in tight glutenite under different effective confining pressures from 1.5 MPa to 21.5 MPa