Hydraulic fracturing in methane-hydrate-bearing sand

Konno, Yoshihiro; Jin, Yusuke; Yoneda, Jun; Uchiumi, Takashi; Shinjou, Kazunori; Nagao, Jiro

doi:10.1039/c6ra15520k

Cited by 121 publications

(72 citation statements)

References 37 publications

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“…[35][36][37] At present, hydraulic fracturing, hydraulic cutting and hydraulic punching are commonly used as the primary methods to improve the permeability of coal for methane extraction and gas-disaster management. [38][39][40][41][42][43] But the coal seams would be wetted at the same time, which can bring some negative effect, such as occupying the seepage channel, increasing the ow resistance and impacting the gas desorption. [44][45][46] Moisture always coexists with gas in coal at all ve stages of gas recovery, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

The occurrence state of moisture in coal and its influence model on pore seepage

Zhao

Cao

et al. 2018

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

The occurrence state of moisture in coal and its influence model on pore seepage

Zhao

Cao

et al. 2018

RSC Adv.

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“…According to Fan et al, the fracture length and width in weakly consolidated sandstone can be up to 28 m and 30 mm when using high‐efficiency fracturing fluid, respectively. In addition, Konno et al have also investigated the fracture characteristics in unconsolidated sediments by cyclic fracturing using X‐ray computed tomography. The researchers observed that the maximum fracture width can approach 60 mm after the second injection.…”

Section: Simulation Modelmentioning

confidence: 99%

“…Consequently, many investigations (eg, Refs. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] have been performed recently, and numerical simulations have still focused on depressurization that is aimed at commercial production from potential target areas. In practice, depressurization has also been widely adopted in field trials in Mallik, 34 the eastern Nankai Trough, 35,36 and the South China Sea.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, certain studies have been reported recently. For example, Konno et al and Too et al have separately investigated the feasibility of creating artificial fractures in their synthetically formed methane hydrates in sand specimens. They have found that hydraulic fracturing is a promising well stimulation method for low‐permeable gas hydrate reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Gas production from a silty hydrate reservoir in the South China Sea using hydraulic fracturing: A numerical simulation

Sun

Ning

Liu

et al. 2019

Energy Science & Engineering

112

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The low permeability of silty hydrate reservoirs in the South China Sea is a critical issue that threatens safe, efficient, and long‐term gas production from these reservoirs. Hydraulic fracturing is a potentially promising stimulation technology for such low‐permeability reservoirs. Here, we assess the gas production potential of a depressurization horizontal well that is assisted by the hydraulic fracturing using numerical simulation according to field data at site SH2 in this area. In addition, the number of horizontal wells drilled is discussed if commercial production is to be performed at this site. The results show that the production potential can be significantly stimulated at the early production stage by adopting hydraulic fracturing in this reservoir due to a better depressurization effect. However, the increase in gas recovery gradually decreases with the continuous dissociation of gas hydrates, and the evolution trend is similar to that in a reservoir without stimulation during later periods of gas production because the dissociation front gradually moves away from the fractures. From the perspective of production potential, using a horizontal well scheme assisted by the hydraulic fracturing technology for gas recovery from a hydrate deposit can sharply reduce the number of operation wells, shorten the drilling operation time, and boost the economic efficiency. The horizontal well scheme may be an effective way to increase the gas yield if the application of quickly deployed horizontal wells and hydraulic fracturing techniques in such hydrate reservoirs greatly increases in the near future.

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“…Konno et. al [15] investigated HF as a well stimulation method during gas recovery from gas hydrate reservoirs. They injected distillate water into methane-hydrate-bearing sand, which was in a three-dimensional confining stress state.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the dissipative structures following microseismic diffusion during hydraulic fracturing of methane-hydrate-bearing sand

Nazimko¹,

Pidgurna

Kusen³

2021

E3S Web of Conf.

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Hydraulic fracturing is a prospective technology for methane hydrate deposit exploitation. The evolution of hydraulically stimulated fractures around the point of liquid injection is simulated. For this purpose, the FLAC3D computer model is used because of its explicit calculation cycle that imitates real physics, prevents numerical instability, and reproduces a realistic path during simulation of the nonlinear rock massif behavior. The results of the simulation provide for new findings, namely, the spatial asymmetry and synchronism violation, spatial deviation, discontinuity, and recurrence during microseismic diffusion, which follow the process of hydraulic fracturing. In addition, dissipative structures were developed due to entropy production, since gas hydrate strata are an open thermodynamic system, which transforms and dissipates the energy of the injected liquid. The process of dissipative structure evolution should be controlled to enhance the gas yield from the hydrates.

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Hydraulic fracturing in methane-hydrate-bearing sand

Abstract: Hydraulic fracturing in methane-hydrate-bearing sand can generate laminar fractures and increase the effective permeability.

Cited by 121 publications

References 37 publications

The occurrence state of moisture in coal and its influence model on pore seepage

The occurrence state of moisture in coal and its influence model on pore seepage

Gas production from a silty hydrate reservoir in the South China Sea using hydraulic fracturing: A numerical simulation

Investigation of the dissipative structures following microseismic diffusion during hydraulic fracturing of methane-hydrate-bearing sand

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