Multiphase flow and mechanical behaviors induced by gas production from clayey-silt hydrate reservoirs using horizontal well

Yuan, Yilong; Xu, Tianfu; Jin, Chunhe; Zhu, Huixing; Gong, Ye; Wang, Fugang

doi:10.1016/j.jclepro.2021.129578

Cited by 36 publications

(14 citation statements)

References 52 publications

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“…As the horizontal distance from the well increases, the subsidence gradually diminishes. In addition, influenced by the seepage force and the decrease in vertical total stress caused by depressurization, , a slight uplift occurs in the strata below the well, with a magnitude of less than 4 cm within 5 years. For a horizontal-well system, mechanical compaction caused by reservoir deformation will decrease reservoir permeability and hinder pressure propagation, thereby influencing the hydrate dissociation rate and gas production performance.…”

Section: Resultsmentioning

confidence: 99%

“…Notably, the average gas production rate during the test period (30 days) increased to 2.87 × 10 4 m 3 /day, representing a substantial improvement over the previous test . Consequently, horizontal-well depressurization has emerged as one of the mainstream methods for future hydrate reservoir exploitation. − …”

Section: Introductionmentioning

confidence: 91%

“…During the exploitation of hydrate-bearing sediments, the reservoir skeleton shows a discernible elastic−plastic deformation, and the incremental form of this deformation is given by 32,33 = D d d ij kl kl ij (12) where D ijkl is the elastic−plastic coefficient matrix tensor and dε kl is the increment of the strain tensor, dimensionless.…”

Section: Thermo-hydro-mechanical-chemical Couplingmentioning

confidence: 99%

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Long-Term Performance and Security of Gas Production for Horizontal-Well Depressurization Exploitation: Insights from a Coupled Thermo-Hydro-Mechanical-Chemical Model for the Shenhu Hydrate Reservoir

Li,

Fan,

et al. 2023

Energy Fuels

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Horizontal-well depressurization for marine hydrate exploitation started in 2020. Short-term gas production stability (∼30 days) contrasts with ongoing uncertainties about long-term performance and security. To address these concerns, we used the 2020 Shenhu field test as a case study and created a fully coupled thermo-hydro-mechanical-chemical model. Employing this model, cumulative gas production closely matched field test data, with a deviation below 1.5%. Our numerical simulations showed the following: (1) Following depressurization initiation, the rapid increase in effective principal stress of the hydrate reservoir stabilized near the well after 30 days and at the seafloor after 2 years, without reaching failure conditions. (2) Variable effective principal stress led to complex temporal and spatial formation deformation. During the 30-day test, subsidence mostly occurred near the well (<10 cm). However, after approximately 250 days, measurable seafloor subsidence (∼3 cm) began, reaching 21 cm after 4 years. (3) Formation deformation hindered gas production. Simulations indicated reductions of 33.6 and 15.2% in cumulative gas release and production volumes, respectively, over 5 years. Our findings shed light on the interplay among depressurization, formation deformation, and gas production in marine hydrate exploitation, contributing to a better understanding of the long-term performance and dynamics of marine hydrate exploitation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Thermo-hydro-mechanical-chemical Couplingmentioning

confidence: 99%

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Long-Term Performance and Security of Gas Production for Horizontal-Well Depressurization Exploitation: Insights from a Coupled Thermo-Hydro-Mechanical-Chemical Model for the Shenhu Hydrate Reservoir

Li,

Fan,

et al. 2023

Energy Fuels

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“…After the second round of hydrate pilot production in the Shenhu sea area of the South China Sea, many researchers carried out a lot of research work on how to use horizontal wells to exploit natural gas hydrate reservoirs efficiently and safely in the sea area. For example, Yuan et al (2020) used a new type of thermal water mechanical (THM) coupling simulator HydrateBiot to optimized the controllable parameters for depressurization-induced gas production using horizontal well in the Shenhu sea area of the South China Sea. Including well placement and perforation length, and the mechanical response caused by gas production in hydrate reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Depressurization-induced gas production from hydrate reservoirs in the Shenhu sea area using horizontal well: Numerical simulation on horizontal well section deployment for gas production enhancement

Wan

Li²,

Yu³

et al. 2023

Front. Earth Sci.

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In 2020, China successfully conducted the second round of natural gas hydrate pilot production with horizontal wells at W11-W17 deposits in the Shenhu sea area of South China Sea, but the average daily gas production is far from reaching the commercial exploitation. Low productivity has become one of the key factors hindering the commercial exploitation of gas hydrate reservoir. This work taking SHSC-4 well as an example, uses numerical simulation method to analyze the impact of the placement of horizontal well section, length and the production system on productivity of horizontal well in depressurization exploitation. From the analysis of simulation results, it can be seen that the best performance of production capacity can be achieved when horizontal section placed in layer II, which is compared with that placed in layer I and III. More importantly, hydrate in layer I and free gas in layer III can be effectively utilized to improve productivity when layer II is exploited. When the horizontal section is arranged in layer II and produced by depressurization with small pressure difference (1 MPa), the longer the horizontal section length is, the better the productivity will be. However, the average cumulative gas production increment per meter is gradually decreasing. According to the simulation results, 300 m is a reasonable horizontal section length for the exploitation of layer II, and the cumulative gas production reaches 2.55 million cubic meters after 60 days of continuous exploitation. In addition, due to the limitations of convective heat transfer in the low-permeability reservoir in the Shenhu sea area, sensible heat can significantly improve the secondary hydrate generated in the wellbore and the reservoir around the wellbore due to throttling expansion effect, which has a good effect on productivity improvement. Compared with the situation without heating, when the horizontal section is arranged in layer II and the length is 300 m, the production mode of depressurization and combined heating is adopted, and the cumulative gas production of 60 days with different pressure difference (1–5 MPa) is 0.14, 5.55, 14.75, 23.72, and 29.5 times higher than that without heating.

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“…In addition, the hot water injection method cannot transfer injected hot water very far from the well due to the low permeability of reservoirs (Feng et al, 2019b). Although, the horizontal well can dramatically increase the gas production rates, the high operating costs and technical difficulty restrict its large-scale application (Feng et al, 2019a;Yuan et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Gas Production From Clayey Silt Hydrate Reservoirs Based on Near Wellbore Artificial Fractures Constructed Using High-Pressure Rotating Water Jets Technology

Wan

et al. 2022

Front. Earth Sci.

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Over 90% of the global hydrate resources are stored in very-low-permeability clayey silt reservoirs. The low permeability significantly restricts the efficiency of gas and water flow into the production well. To enhance gas production efficiency in low-permeability hydrate reservoirs, the high-pressure rotating water jets (HPRWJ) technology is proposed to construct near wellbore artificial fractures (NWAFs) in hydrate reservoirs. The HPRWJ avoid the risks of hydraulic fracturing as well as large-scale reservoir damage, which makes it more suitable for constructing fractures in hydrate-bearing sediments (HBS). In this article, the site SH7 in the South China Sea is studied to evaluate the feasibility of this technology for enhancing gas production of low-permeability hydrate reservoirs by numerical simulation. The results show that the gas productivity is increased by approximately three times by using the HPRWJ technology to construct NWAFs with a depth of 3 m. It is suggested that the proposed technology is a promising method for improving gas production from the low-permeability hydrate reservoirs. Furthermore, the gas production performance is closely related to NWAF depth, NWAF permeability, and NWAF spacing. For the site SH7 in the South China Sea, the NWAF depth, permeability, and spacing are recommended as 3 m, 3D, and 3 m, respectively.

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Multiphase flow and mechanical behaviors induced by gas production from clayey-silt hydrate reservoirs using horizontal well

Cited by 36 publications

References 52 publications

Long-Term Performance and Security of Gas Production for Horizontal-Well Depressurization Exploitation: Insights from a Coupled Thermo-Hydro-Mechanical-Chemical Model for the Shenhu Hydrate Reservoir

Long-Term Performance and Security of Gas Production for Horizontal-Well Depressurization Exploitation: Insights from a Coupled Thermo-Hydro-Mechanical-Chemical Model for the Shenhu Hydrate Reservoir

Depressurization-induced gas production from hydrate reservoirs in the Shenhu sea area using horizontal well: Numerical simulation on horizontal well section deployment for gas production enhancement

Enhancement of Gas Production From Clayey Silt Hydrate Reservoirs Based on Near Wellbore Artificial Fractures Constructed Using High-Pressure Rotating Water Jets Technology

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