Methane Productions From Class 3 Gas Hydrate Reservoir Using CMG Stars At Qilian,China

Methane hydrates are viewed as the future world’s primary energy source.Methane hydrate forms when molecules of methane and water bind together under conditions of low temperature and high pressure.Location（marine vs.permafrost）,porosity（matrix vs.fractures）,gases origins（biogenic,thermogenic,mixed）,as well as the presence of a free-gas with mobile-water zone below the HBL all contribute to the diversity of gas hydrate reservoirs（class 1,2,3,4）.Depressurization,heat,chemicals,carbon dioxide,or a mix of these can all be used to convert CH₄-hydrates into methane（CH₄）.Qilian,China’s CMG Stars was used for the numerical calculations.To evaluate the significance of the permeability,saturation,pressure,and temperature of the hydrate reservoir,the first study used numerical simulations in the combination of the depressurization as well as carbon dioxide injection in Dual wells.The study found that the reservoir’s permeability and pressure had the biggest impacts within the recovery of methane in gas hydrate within the Qilian Mountain Permafrost,based on an examination of the OFAT sensitivity data and an analysis of variance for the entire factorial design.Permeability,saturation,pressure,and temperature all affect the response variable but cannot be determined using the OFTA,hence the full factorial design was used to establish these interactions.Cases 6 and 3 on Problem 1 achieved a maximum output of 10,000 m³/day having a recovery percentage of 17%,while Cases 4and 7 on Problem 2 achieved a maximum output of 5,500 m³/day and a recovery ratio of22%.In the second one,researchers compared the effects of depressurization with CO₂and N₂.CO₂/N₂ injection-based production of gases provides significantly more CH₄ than conventional method under the same production pressure.Nitrogen production and the injection-production ratio,however,both increase dramatically with a mole percentage of nitrogen between 50 and 100.An increase from 30%to 50%in the nitrogen mole percentage dramatically boosts methane production as well as output from the reservoir.The third research study involving CO₂ sequestration used an injection-production ratio that took into account the ratio of recovered CH₄ to CO₂ for optimal results.The CO₂ storage ratio increases substantially with increasing CO₂ content in the injection gas and decreases slightly with increasing injection pressure.Throughout the whole production period,the carbon dioxide（CO₂）sequestration ratio was greater than 64%while the mole ratio of CO₂ within the injection of gas was 70%,with only minor fluctuations.The primary contributions of this research are as follows:（1）The novel contribution of this research is the identification of methane hydrate’s potential as a major source for clean energy.Methane is a powerful greenhouse gas,but if harnessed as an energy source,it might lead to a net decrease in emissions of this type of gas into the environment.Energy independence and security can benefit from the creation of productive practices that are both efficient and environmentally friendly.Knowing the effects of parameters like saturation,permeability,pressure,and temperature,the CMG STAR simulation models of depressurization and carbon dioxide injection in a Dual well had a broad application and provide new knowledge for optimizing gas production efficiency.（2）Engineers can maximize production and reduce production problems by strategically placing wells and designing them with permeability and porosity in mind.The findings of this research can be used to expedite design and economic analyses,as well as comparison of various gas hydrate production scenarios in permafrost sediments.Understanding the complicated behaviour of methane hydrates is crucial to the ongoing development of this significant energy resource,and numerical simulations can substantially aid in this endeavour.（3）The study’s methods and technologies will find widespread usage in the future,particularly in the areas of carbon dioxide（CO₂）storage and the manufacture of methane gas,a major energy source.By simultaneously depressurizing and injecting CO₂ through two injectors together with a dual well producer system,we can mitigate the warming effects of carbon dioxide（CO₂）stored as CO₂-hydrates.Methane output in class 3 methane hydrate reservoirs needs to be increased to meet the growing global need for energy,hence sensitivity analyses of parameters like permeability,saturation,pressure,and temperature are being studied.To maximize methane production while simultaneously regulating sand production,decreasing water output,influencing all factors related to adsorption,and mitigating geomechanically hazards by preventing deformation caused by the replacement of CH₄ hydrate with CO₂hydrate,a dual-well depressurization and CO₂ combination technique is recommended.