Hydraulic fracturing in a penny-shaped crack. Part I: Methodology and testing of frozen sand

Too, Jun Lin; Cheng, Arthur; Khoo, Boo Cheong; Palmer, Andrew; Linga, Praveen

doi:10.1016/j.jngse.2017.12.022

Cited by 44 publications

(19 citation statements)

References 16 publications

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“…Recently, hydraulic fracturing became a hot topic in hydrate development stimulation. Many studies have determined the fracability of hydrate-bearing sediments 33,34 and investigated the stimulation potential of hydraulic fracturing on hydrate development. 35−39 Our previous studies have explored the stimulation effect of hydraulic fracturing on the development mode of D + T iw and investigated the influence of fracture parameters on the exploitation effect.…”

Section: 32mentioning

confidence: 99%

“…Recently, hydraulic fracturing became a hot topic in hydrate development stimulation. Many studies have determined the fracability of hydrate-bearing sediments , and investigated the stimulation potential of hydraulic fracturing on hydrate development. − Our previous studies have explored the stimulation effect of hydraulic fracturing on the development mode of D + T iw and investigated the influence of fracture parameters on the exploitation effect. , Studies’ results determined that the fractures can greatly promote hydrate decomposition, and especially, the fractures greatly promote the migration of CH 4 released by the thermal stimulation to the production wells. As a result, the depressurization combined with hot water injection stimulated by hydraulic fracturing (D + T iw + HF) development mode show an excellent CH 4 production capacity, indicating that D + T iw + HF has a promising application prospect.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Influence of Injection–Production Parameters on Challenging Natural Gas Hydrate Exploitation Using Depressurization Combined with Thermal Injection Stimulated by Hydraulic Fracturing

et al. 2021

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The development of low-permeability hydrate reservoirs is facing serious problems. Our previous studies determined that depressurization combined with hot water injection stimulated by hydraulic fracturing (D + Tiw + HF) development mode has an excellent production potential in low-permeability hydrate reservoirs. Based on these, this study further explored the influences of injection–production parameters including injection temperature (T i), injection pressure (P i), and production pressure (P p) on D + Tiw + HF through single-factor and multivariate sensitivity analysis. Results show that the influence of T i, P i, and P p on D + Tiw + HF was divided into two opposite stages by the water breakthrough of production wells (t wb). The hydrate decomposition rate and CH4 production rate increase linearly with the increase in T i and P i and decrease in P p before t wb; however, they decrease gradually with the increase in T i and P i and decrease in P p after t wb. The sensitivity ranges of cumulative CH4 production (V P) to P p, T i, and P i are (3, 4.5), (0, 1.5), and (0, 1) in the first year and (1, 5), (0.5, 3), and (1, 2) in the fifth year, respectively. The sensitivity ranges of the energy ratio (ER) to P p, T i, and P i are (−2, −1), (−6, 0), and (−2.5, −1.5) in the first year and (−1.5, −1), (−7, 0), and (−2, 1) in the fifth year, respectively. This determines that V P is most sensitive to Pp , and the ER is most sensitive to T i. Furthermore, the ER is more sensitive to smaller T i. The V P is more sensitive to smaller P p in the early development stage (1 year, before t wb), while it is more sensitive to lager P p in the later development stage (5 years, after t wb). As a result, an as low as possible P p, low T i, and higher P i is suggested in the early development stage, while low T i and higher P i are suggested in the later development stage, and too small P p is unnecessary.

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Section: 32mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Injection–Production Parameters on Challenging Natural Gas Hydrate Exploitation Using Depressurization Combined with Thermal Injection Stimulated by Hydraulic Fracturing

et al. 2021

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“…In consideration of the significant effect of hydraulic fracturing in unconventional oil and gas productions for production enhancement [14], the technique of artificial fracture is proposed for gas hydrate exploitation [15], and its feasibility has been studied theoretically and experimentally [16][17][18]. Ito et al [19] successfully created a hydraulic fracture in unconsolidated sediments for producing methane from hydrate in lab, and the developed fracture was found to occur along the interface between the sand and mud layers.…”

Section: Introductionmentioning

confidence: 99%

“…In the experimental study carried out in a triaxial pressure cell, Konno et al [21] found that the permeability of the methane hydrate-bearing sediments increased after fracturing and would be maintained even after fracture closed. Too et al [16,17] identified the challenges of hydraulic fracturing in sandy sediments and artificially created fractures in the synthetic sediment made in the lab, illustrating the prospect of applying in the natural hydrate-bearing sediments. During the field trial of gas hydrate production in the South China Sea, micro-fractures were induced to increase the permeability of the reservoir sediments to enhance the production performance [10].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Feng et al [23] considered the fractured zone around the production well as a highpermeability elliptic zone (e.g., the semi-major axis is 50 m, and the semi-mini axis is 20 m) and showed that it can enhance the gas production efficiently. However, a penny-shaped fracture is usually induced in the hydrate-bearing sediments for the vertical well [16,17,21], and it is commonly described by fracture length and conductivity [24]. Hence, it is necessary to find out how fracture length and conductivity affect gas production from a fractured hydrate reservoir.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of the Length and Conductivity of Artificial Fracture on Gas Production from a Class 3 Hydrate Reservoir

Shang

2021

Energies

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Natural gas hydrate is considered as a potential energy resource. To develop technologies for the exploitation of natural gas hydrate, several field gas production tests have been carried out in permafrost and continental slope sediments. However, the gas production rates in these tests were still limited, and the low permeability of the hydrate-bearing sediments is identified as one of the crucial factors. Artificial fracturing is proposed to promote gas production rate by improving reservoir permeability. In this research, numerical studies about the effect of fracture length and fluid conductivity on production performance were carried out on an artificially fractured Class 3 hydrate reservoir (where the single hydrate zone is surrounded by an overlaying and underlying hydrate-free zone), in which the equivalent conductivity method was applied to depict the artificial fracture. The results show that artificial fracture can enhance gas production by offering an extra fluid flow channel for the migration of gas released from hydrate dissociation. The effect of fracture length on production is closely related to the time frame of production, and gas production improvement by enlarging the fracture length is observed after a certain production duration. Through the production process, secondary hydrate formation is absent in the fracture, and the high conductivity in the fracture is maintained. The results indicate that the increase in fracture conductivity has a limited effect on enhancing gas production.

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基于cdem的天然气水合物沉积物水力压裂裂纹扩展数值模拟

Huang,

Wang,

Wang

et al. 2024

Acta Mech. Sin.

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Hydraulic fracturing in a penny-shaped crack. Part I: Methodology and testing of frozen sand

Cited by 44 publications

References 16 publications

Research on the Influence of Injection–Production Parameters on Challenging Natural Gas Hydrate Exploitation Using Depressurization Combined with Thermal Injection Stimulated by Hydraulic Fracturing

Research on the Influence of Injection–Production Parameters on Challenging Natural Gas Hydrate Exploitation Using Depressurization Combined with Thermal Injection Stimulated by Hydraulic Fracturing

The Effects of the Length and Conductivity of Artificial Fracture on Gas Production from a Class 3 Hydrate Reservoir

基于cdem的天然气水合物沉积物水力压裂裂纹扩展数值模拟

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