scholarly journals Cyclic methane hydrate production stimulated with CO2 and N2

2021 ◽  
Vol 76 ◽  
pp. 14
Author(s):  
Zhizeng Xia ◽  
Jian Hou ◽  
Xuewu Wang ◽  
Xiaodong Dai ◽  
Mingtao Liu
Keyword(s):  
Methane Hydrate ◽  
Kinetic Constant ◽  
Production Performance ◽  
Production Model ◽  
Absolute Permeability ◽  
Cyclic Process ◽  
Hydrate Dissociation ◽  
Formation Kinetic ◽  
Hydrate Reservoir ◽  
Cyclic Production

The cyclic methane hydrate production method was proposed with CO2 and N2 mixture stimulation. The cyclic production model was established based on actual hydrate reservoir parameters, accordingly, the production characteristics were analyzed, and a sensitivity analysis was conducted. The results show the following: (1) The depressurization mechanism is dominant in the cyclic production. CH4 production and CH4 hydrate dissociation can be greatly enhanced because the cyclic process can effectively reduce the partial pressure of CH4 (gas phase). However, there is a limited effect for CO2 storage. (2) Heat supply is essential for continuous hydrate dissociation. The CH4 hydrate dissociation degree is the highest in the near-wellbore area; in addition, the fluid porosity and effective permeability are significantly improved, and the reservoir temperature is obviously decreased. (3) The initial CH4 hydrate saturation, absolute permeability, intrinsic CO2 hydrate formation kinetic constant, injection time and production time can significantly influence the production performance of the natural gas hydrate reservoir.

scholarly journals Influence of Intrinsic Permeability on the Production Performance of Shenhu Hydrate Sediment through Depressurization

2019 ◽  
Vol 118 ◽  
pp. 01008
Author(s):  
Yingrui Ma ◽  
Shuxia Li ◽  
Didi Wu
Keyword(s):  
Production Rate ◽  
Gas Production ◽  
Production Performance ◽  
Absolute Permeability ◽  
Reservoir Pressure ◽  
Intrinsic Permeability ◽  
Reservoir Temperature ◽  
Natural Gas Hydrate ◽  
Hydrate Dissociation ◽  
Hydrate Reservoirs

Natural gas hydrate(NGH) is a clean resource with huge reserves. The depressurization method is an economical and effective exploitation method. In the process of depressurization, reservoir absolute permeability has an important influence on production results. Based on the data of Shenhu hydrate reservoirs, this paper established a depressurization production numerical simulation model. Then, the production performances such as pressure, temperature, gas production rate, cumulative gas production, and hydrate dissociation effect are all studied under different permeability conditions.study the change of reservoir pressure, gas production rate, cumulative gas production, reservoir temperature change and hydrate dissociation effect under different permeability conditions. Results show that higher permeability is conducive to the depressurization of hydrate reservoirs.

Numerical Simulation on Natural Gas Production From Gas Hydrate Dissociation by Depressurization

2012 ◽  
Author(s):  
Tao Yu ◽  
Weiguo Liu ◽  
Jiafei Zhao ◽  
Yongchen Song ◽  
Yu Liu
Keyword(s):  
Gas Hydrate ◽  
Gas Production ◽  
Absolute Permeability ◽  
Hydrate Dissociation ◽  
One Dimensional ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir ◽  
Calculation Results ◽  
Dissociation Model ◽  
Set Up

The paper presented a numerical model on the gas hydrate production by depressurization. During the simulation a one-dimensional dissociation model applied to a gas hydrate reservoir was set up to simulate the process of gas hydrate production by depressurization. Based on the calculation results, influences of the gas pressure, saturation, porosity and absolute permeability on the production effect were studied respectively. The results obtained from the sensitivity analysis provide theoretical supported for the actual gas hydrate production.

Formation and Dissociation of Oceanic Methane Hydrate for a Low CO2 Emission Power Generation System

2011 ◽  
Author(s):  
Shigenao Maruyama ◽  
Koji Deguchi ◽  
Atsuki Komiya
Keyword(s):  
Numerical Simulation ◽  
Power Generation ◽  
Methane Hydrate ◽  
Co2 Emission ◽  
Generation System ◽  
Emission Power ◽  
Hydrate Dissociation ◽  
Methane Gas ◽  
Hydrate Reservoir ◽  
Power Generation System

Methane hydrate dissociation is studied using numerical and experimental approaches for a low carbon dioxide (CO2) emission power generation system utilizing methane hydrate. A novel power generation system has been proposed by authors, in which methane gas produced from oceanic methane hydrate reservoir by thermal stimulation method is used as fuels. The performance of the power generation system and the heat loss during the injection of hot seawater to the methane hydrate layer were investigated in previous study. However, the estimation of the methane gas production rate from the methane hydrate reservoir is necessary to evaluate the performance of whole system. In this study, we conducted the numerical simulation of methane hydrate reservoir. In order to evaluate the reaction rate of methane hydrate dissociation, the methane hydrate formation and dissociation experiment was conducted. The result of numerical simulation indicates the necessity of improvement of the production process to supply the heat of hot water effectively. From the experimental result, it comes to see that consideration of the scale effect of the methane hydrate construction is necessary to describe the dissociation rate.

scholarly journals Effect of Perforation Interval Design on Gas Production from the Validated Hydrate-Bearing Deposits with Layered Heterogeneity by Depressurization

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Yingli Xia ◽  
Tianfu Xu ◽  
Yilong Yuan ◽  
Xin Xin
Keyword(s):  
Energy Demand ◽  
Production Efficiency ◽  
Gas Production ◽  
Production Performance ◽  
Gas Release ◽  
Methane Recovery ◽  
Hydrate Dissociation ◽  
Gas Recovery ◽  
Hydrate Reservoir ◽  
Production Wells

Natural gas hydrate is considered as one of the best potential alternative resource to address the world’s energy demand. The available geological data at the Mallik site of Canada indicates the vertical heterogeneities of hydrate reservoir petrophysical properties. According to the logging data and sample analysis results at the Mallik 2L-38 well, a 2D model of geologically descriptive hydrate-bearing sediments was established to investigate the multiphase flow behaviors in hydrate reservoir induced by gas recovery and the effects of perforation interval on gas production performance. Firstly, the constructed model with vertical heterogeneous structures of permeability, porosity, and hydrate saturation was validated by matching the measured data in the Mallik 2007 test. The excessive residual methane in the hydrate reservoir observed in simulated results indicates insufficient gas production efficiency. For more effective methane recovery from a hydrate reservoir, the effect of perforation interval on long-term gas production performance was investigated based on the validated reservoir model. The simulation results suggest that both the location and length of the perforation interval have significant impact on hydrate dissociation behavior, while the gas production performance is mainly affected by the length of the perforation interval. To be specific, an excellent gas release performance is found in situations where the perforation interval is set at the interface between a hydrate reservoir and an underlying water-saturated zone. By increasing the perforation interval lengths of 5 m, 8 m, and 10 m, the gas release volumes from hydrate dissociation and gas production volumes from production wells are increased by 34%, 52%, and 57% and 37%, 58%, and 62%, respectively.

The Characteristic of Hydrate Exploitation by Depressurization

2013 ◽  
Author(s):  
Weixin Pang ◽  
Qingping Li ◽  
Xichong Yu ◽  
Fujie Sun ◽  
Gang Li
Keyword(s):  
South China Sea ◽  
South China ◽  
Methane Hydrate ◽  
Gas Production ◽  
Shenhu Area ◽  
Hydrate Dissociation ◽  
Hydrate Reservoir ◽  
Hydrate Saturation ◽  
Porosity And Permeability ◽  
Hydrate Deposit

According to the schematic and properties of a methane hydrate deposit in Shenhu Area of South China Sea in China, the characteristic of hydrate dissociation, water and gas production were simulated with a depressurization method. The effect of hydrate saturation, porosity and permeability et al. on hydrate dissociation was studied, the key controlling factor and difficulty of gas production from hydrate reservoir by depressurization was confirmed.

RECOVERY OF GAS FROM METHANE HYDRATE RESERVOIR BY SIMULTANEOUS DEPRESSURIZATION AND N2 INJECTION

2018 ◽  
Author(s):  
Saurav Parashar ◽  
Raghvendra Pratap Singh ◽  
Malay Kumar Das
Keyword(s):  
Methane Hydrate ◽  
Hydrate Reservoir

TEMPERATURE CHANGES FOR METHANE HYDRATE DISSOCIATION IN DIFFERENT CLASS DEPOSITS BY DEPRESSURIZATION

2018 ◽  
Author(s):  
Mingjun Yang ◽  
Yi Gao ◽  
Hang Zhou ◽  
Bingbing Chen ◽  
Yongchen Song
Keyword(s):  
Methane Hydrate ◽  
Hydrate Dissociation ◽  
Temperature Changes
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