Numerical simulation of the improved gas production from low permeability hydrate reservoirs by using an enlarged highly permeable well wall

Zhang, Jinming; Li, Xiao-Sen; Chen, Zhaoyang; Li, Qingping; Li, Gang; Lv, Tao

doi:10.1016/j.petrol.2019.106404

Cited by 42 publications

(19 citation statements)

References 51 publications

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“…Besides, a novel method, which consisted of an enlarged highly permeable wellbore, was proposed to improve the gas production. 137 Aiming for the low-permeability hydrate reservoir in the SCS, the simulation results showed that the enlarged wellbore provided a highpermeability channel for fluid flow in the near wellbore formation, which showed the depressurization effects in the hydrate-bearing sediments. If applicable, this might be another reservoir stimulation technique by improving the percolation flow capacity.…”

Section: Advances On Natural Gas Hydratementioning

confidence: 98%

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Jian-wu

2021

Energy Fuels

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Because of the urgency of energy transition for a net-zero society, the world’s gas demand is rapidly increasing. Natural gas hydrate (NGH) is regarded as the next alternate energy resource to meet the demand, thanks to its high energy density and enormous reserves. As two successful production trials and a series of relevant drilling expeditions were implemented in the northern slope of the South China Sea (SCS), it may now be the most promising district for NGH exploitation in the world. The objective of this work is to review the recent research advances on hydrate exploration status, reservoir geological features, hydrate-bearing sediment geophysical properties, and hydrate exploitation techniques related to the hydrate reservoirs in the SCS. Geological surveys, well logging and core sampling were performed and helped the analysis of hydrate occurrence, gas origin, and accumulation mechanism. It is inferred that both microgenic and thermogenic gas present in SCS hydrate reservoirs and the hydrate accumulation is primarily controlled by the structure of the gas chimney. The characteristics of high porosity, low permeability, weak diagenesis, weak strength, and complex hydrate dissociation behaviors of the gas hydrate-bearing sediments from the SCS determined that innovative exploitation approaches are required. Different well configurations and reservoir stimulation techniques were proposed to enhance the production efficiency and evaluated through simulation and laboratory experiments. As the NGH development process in the SCS progresses continuously, it attracts more and more research interests from academic and engineering communities. We are convinced that, with constant diligence and effort, China will achieve the goal of safe and efficient commercial exploitation in the near future.

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Section: Advances On Natural Gas Hydratementioning

confidence: 98%

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Jian-wu

2021

Energy Fuels

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“…Numerical reservoir simulation (NRS) is considered the optimal traditional means for forecasting oil production. NRS method relies on a numerical model, which tends to achieve good performance and evaluate reservoir geological heterogeneity [5,6]. Furthermore, the NRS models have some limitations, including being time-consuming, cumbersome [7], and it requires constructing an accurate static model, history matching, and other dynamic model parameters.…”

Section: Introductionmentioning

confidence: 99%

Optimized ANFIS Model Using Aquila Optimizer for Oil Production Forecasting

et al. 2021

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Oil production forecasting is one of the essential processes for organizations and governments to make necessary economic plans. This paper proposes a novel hybrid intelligence time series model to forecast oil production from two different oil fields in China and Yemen. This model is a modified ANFIS (Adaptive Neuro-Fuzzy Inference System), which is developed by applying a new optimization algorithm called the Aquila Optimizer (AO). The AO is a recently proposed optimization algorithm that was inspired by the behavior of Aquila in nature. The developed model, called AO-ANFIS, was evaluated using real-world datasets provided by local partners. In addition, extensive comparisons to the traditional ANFIS model and several modified ANFIS models using different optimization algorithms. Numeric results and statistics have confirmed the superiority of the AO-ANFIS over traditional ANFIS and several modified models. Additionally, the results reveal that AO is significantly improved ANFIS prediction accuracy. Thus, AO-ANFIS can be considered as an efficient time series tool.

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“…The numerical simulation results show that the hydrate decomposition rate increases from 8.9 to 45.4% by setting 90 m impermeable barriers. For the same purpose that expand the impact range of production wells, Zhang et al 17 built and artificial well around the original vertical well in order to enlarge the influence effect of the production wells on the circumference of the well. The simulation results show that gas volume is increased by more than four times and the farthest distance of hydrate dissociation front is increased by more than two times.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Gas Hydrate Production Performance of the Depressurization and Backfilling with an In Situ Supplemental Heat Method

Zhang

et al. 2021

ACS Omega

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The depressurization and backfilling with an in situ supplemental heat method had been proposed to enhance the gas production of methane hydrate reservoir. This novel method is evaluated by a numerical simulator based on the finite volume method in this work. Based on the typical marine low-permeability hydrate-bearing sediments (HBS), a reservoir model with gas fracturing and CaO powder injection is constructed. The simulation results show that the stimulated fractures could effectively enhance the pressure drop effect. Moreover, the CaO injection could provide in situ heat simultaneously. Based on the sensitivity analysis of the equivalent permeability of fractures and the mass of CaO injection, it is found that a threshold fracture permeability exists for the increasing of gas production. The gas production increases with the equivalent permeability only when the permeability is smaller than the threshold value. Meanwhile, the more CaO are injected into reservoir, the larger volume of gas production. In general, this work theoretically quantifies the potential value of the depressurization and backfilling with an in situ supplemental heat method for marine gas hydrate recovery.

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Numerical simulation of the improved gas production from low permeability hydrate reservoirs by using an enlarged highly permeable well wall

Cited by 42 publications

References 51 publications

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Recent Advances on Natural Gas Hydrate Exploration and Development in the South China Sea

Optimized ANFIS Model Using Aquila Optimizer for Oil Production Forecasting

Numerical Evaluation of Gas Hydrate Production Performance of the Depressurization and Backfilling with an In Situ Supplemental Heat Method

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