Gas–Liquid–Solid Migration Characteristics of Gas Hydrate Sediments in Depressurization Combined with Thermal Stimulation Dissociation

Cheng, Chuanxiao; Wang, Fan; Zhang, Jun; Qi, Tian; Pan, Xu; Zheng, Jili; Zhao, Jiafei; Zhang, Hanquan; Xiao, Bo; Li, Lun; Yang, Penglin; Lv, Shuai

doi:10.1021/acsomega.9b02497

Cited by 9 publications

(5 citation statements)

References 47 publications

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“…It is however known that gas hydrate growth and dissociation are accompanied by changes in bulk volumes in sediments, loss of sediment strength and subsidence of ground surfaces 37 . Experiments of hydrate growth and dissociation in sediments have shown that the sediment volume will remain expanded compared to initial sediment volume after dissociation leaving a permanent widening of pores, fractures and fissures 38 . The conceptual model of mound growth and crater formation presented in Andreassen, et al 5 focussing on the same craters and mounds as this study, explains that during more widespread and thicker gas hydrate stability conditions during the last glaciation, growth of gas hydrates in pore spaces and fractures, exerted pressure on the sedimentary lattice.…”

Section: Discussionmentioning

confidence: 99%

Geological controls of giant crater development on the Arctic seafloor

Waage

Serov

Andreassen

et al. 2020

Sci Rep

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Active methane seepage occurs congruent with a high density of up to 1 km-wide and 35 m deep seafloor craters (>100 craters within 700 km 2 area) within lithified sedimentary rocks in the northern Barents Sea. the crater origin has been hypothesized to be related to rapid gas hydrate dissociation and methane release around 15-12 ka BP, but the geological setting that enabled and possibly controlled the formation of craters has not yet been addressed. to investigate the geological setting beneath the craters in detail, we acquired high-resolution 3D seismic data. The data reveals that craters occur within ~250-230 Myr old fault zones. Fault intersections and fault planes typically define the crater perimeters. Mapping the seismic stratigraphy and fault displacements beneath the craters we suggest that the craters are fault-bounded collapse structures. The fault pattern controlled the craters occurrences, size and geometry. We propose that this triassic fault system acted as a suite of methane migration conduits and was the prerequisite step for further seafloor deformations triggered by rapid gas hydrate dissociation some 15-12 ka BP. Similar processes leading to methane releases and fault bounded subsidence (crater-formation) may take place in areas where contemporary ice masses are retreating across faulted bedrocks with underlying shallow carbon reservoirs. Manifestations of past and present seabed methane discharge, such as seafloor pockmarks 1 , gas hydrate pingos 2 , craters 3 , and mounds 4,5 appear widely along Arctic continental margins. While pockmarks have received considerable attention from the fluid flow research community and petroleum industry for many decades 6-9 , km-wide seabed craters and associated mounds have garnered less scrutiny. Various studies report craters appearing on the seafloor on the Arctic continental shelf 3,5,10 , in the Scotia Sea 11 , at the Chatham Rise offshore New Zealand 12 , and on buried glacial surfaces in several areas of the Arctic 13,14. These reports may reveal that such features are more widespread than previously thought. As opposed to the crater site at the Scotia Sea and Chatham Rise, the crater area in the Barents Sea emits methane gas from the seabed today. Andreassen, et al. 5 , and Long, et al. 15 , document spatial relationships between craters and gas expulsions, and hypothesize that the craters are collapse features caused by blow-outs of over-pressured methane accumulations. A causal relationship between methane dynamics and crater development, however, remains unclear. Methane seepage from the seabed is the largest source of methane to the ocean 16. Nevertheless, due to methane dissolution and subsequent aerobic oxidation in the water column e.g. 17-20 , methane from deep water seep sources contributes less to the atmospheric carbon budget than previously thought. Because the lifetime of a methane bubble in the ocean depends on how much methane is already dissolved in the water and for how long the bubble is exposed, shallow-water seeps and larger plum...

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Section: Discussionmentioning

confidence: 99%

Geological controls of giant crater development on the Arctic seafloor

Waage

Serov

Andreassen

et al. 2020

Sci Rep

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“…The later experiments regarding sand production behaviors mainly focused on (1) fines migration and its influences on physical properties of the host sediment from both macro-scale , and microscale perspectives; (2) Multilateral coupling effect between depressurization strategies and particle migration. − (3) Influences of sand-control devices on fines production, as well as fine-induced plugging of wellbore equipment. − (4) Influences of interlayered heterogeneous strata characteristics on sand production behaviors …”

Section: Mechanisms Of Sandingmentioning

confidence: 99%

“…This was a pioneering work, although we would now conclude that the results are limited, or at least not ideal, to cover all sanding mechanisms for HBS since sand production also arose in conventional natural gas production reservoirs with barely water production. 74,75 The later experiments regarding sand production behaviors mainly focused on (1) fines migration and its influences on physical properties of the host sediment from both macroscale 56,76 and microscale 77 perspectives; (2) Multilateral coupling effect between depressurization strategies and particle migration. 77−80 (3) Influences of sand-control devices on fines production, as well as fine-induced plugging of wellbore equipment.…”

Section: Mechanisms Of Sandingmentioning

confidence: 99%

Sand Production Management during Marine Natural Gas Hydrate Exploitation: Review and an Innovative Solution

Chen

et al. 2021

Energy Fuels

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Natural gas hydrate (NGH) is widely distributed worldwide with great reserves and is generally accepted as a promising alternative energy source. However, sustainable, efficient, and safe NGH development has been proven to be restricted by a series of geomechanical problems, among which sand production has become prominent and attention-catching. This review systematically summarizes the up-to-date literatures and reports our latest work to improve the fundamental understandings of the sand production issues in NGH development. It is noted that sand production is defined as a systematic “issue”, rather than a “problem” in this paper, considering both the adverse and favorable influences of sand production on continuous gas production from hydrate-bearing sediment (HBS). Several challenges and insightful suggestions are put forward for future research from the viewpoint of the sand production management system (SMS). Furthermore, an innovative method for unlocking conflicts between sand production and gas extraction in muddy HBS is proposed, namely, the gravel-huff to clay-puff replacement (GCR) technique. The outlook and perspectives of this technique are presented, as well as the key challenges to be resolved.

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“…In addition to hydrate blockages in pipelines that need to be dissociated, the natural gas hydrates also decompose continuously during the extraction process, which can lead to engineering geological disasters such as subsea stratum deformation, platform tilt and sinking, and climate change. Therefore, many scholars have studied the decomposition characteristics of hydrate particles in high-pressure reactors or porous media by thermal and pressure methods. ,− Among them, in addition to reflecting the decomposition by structural morphology, temperature signalization, and pressure signalization, some scholars also monitored the decomposition process of the hydrate by the change of resistivity (or conductivity), which is a physical quantity that can well reflect the process. Zatsepina et al , monitored the nucleation and decomposition of CO 2 hydrate in porous media by the resistance method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Hydrate Decomposition on the Gas-Phase Wall Using a Rock-Flow Cell

Zhang

Song

et al. 2023

Energy Fuels

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Hydrate control has always been essential to oil and gas pipeline flow assurance work. To study the decomposition process of the hydrate deposition layer in the gas–water system, the decomposition experiments of the hydrate layer on the gas-phase pipe wall under different heating temperatures, different depressurization rates, and the combined action of heating and depressurization were carried out by using a high-pressure transparent rock-flow cell with a voltage detection system. The dynamic decomposition process was observed, and it was found that the decomposition rate was faster when decomposed by the depressurization method compared to the heating method. The decomposition process of the hydrate layer was quantitatively analyzed based on the voltage signal, and an electrical signal-based method for monitoring the decomposition of the hydrate layer on the pipe wall was proposed. The decomposition mechanism of the hydrate layer in different ways is summarized. During decomposition by heating, the hydrate layer decomposes in the mode of shrinkage ablation. During depressurization decomposition, it decomposes in the mode of differential ablation with the shedding phenomenon. The impact force generated by the gas release is the main reason for hydrate layer shedding. Shedding of the mixture of ice and hydrate occurs at depressurization rates ranging from 0.026 to 0.056 MPa/s, with the risk of ice blockage. This work provides further insight into hydrate decomposition in gas–water flow systems.

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Gas–Liquid–Solid Migration Characteristics of Gas Hydrate Sediments in Depressurization Combined with Thermal Stimulation Dissociation

Cited by 9 publications

References 47 publications

Geological controls of giant crater development on the Arctic seafloor

Geological controls of giant crater development on the Arctic seafloor

Sand Production Management during Marine Natural Gas Hydrate Exploitation: Review and an Innovative Solution

Experimental Study of Hydrate Decomposition on the Gas-Phase Wall Using a Rock-Flow Cell

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