Fundamental Study on Gas Production from Sediments Containing Natural Gas Hydrates

含天然气水合物沉积物产气基础研究

• 批准号: 07455409
• 负责人: MASUDA Yoshihiro
• 金额: $ 1.66万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455409/
• 关键词: hydrate; petroleum engineering; methane; natural gas; equation of state; キセノン

The researchers have studied the dissociation behavior of hydrates in sediments by experimental and modeling approach, considering the depressurization technique of gas production from hydrate sediments.Two experimental apparatuses were constructed. One was designed for measuring formation and dissociation rates of hydrate in a cell. The experiment using xenon gas showed that it took several hours to reach equilibrium state after the start of formation and dissociation of hydrate. The hydrate number of formed xenon hydrate was higher than its theoretical value. Another apparatus was designed for measuring the decrease in gas permeability with hydrate formation in porous media. The change in gas permeability with hydrate saturation was mathematically modeled from the experimental results using a core packed with 710-840 mum glass beads. Although the method for forming hydrate in the core was established, the dissociation rate of hydrate in the core could not be measured because the total pore volume was too small for accurate measurement of gas flow rate.Regarding to modeling study, a numerical program was developed for predicting phase behavior of methane-water mixture. For predicting gas production performance from porous media containing hydrates, two numerical programs were developed. One was based on phase-equilibrium theory, and another was based on dissociation kinetics of hydrate. From model calculations using these programs, the dissociation behavior of hydrate in a one-dimensional core was studied. The calculations showed that the three factors would affect the dissociation rate of hydrates in sediments : heat conduction from the surroundings ; the dissociation rate of hydrate crystals ; and permeability of sediments.

针对水合物沉积物降压采气技术，通过实验和模拟方法研究了水合物在沉积物中的分解行为。一个是用于测量水合物的形成和分解速率的细胞。使用氙气的实验表明，从水合物开始形成和分解到达到平衡状态需要几个小时。生成的氙水合物的水合物数高于其理论值。设计了另一种装置，用于测量多孔介质中水合物形成时气体渗透率的降低。气体渗透率与水合物饱和度的变化是从实验结果使用710-840 μ m玻璃珠填充的核心数学建模。虽然建立了水合物在岩心中形成的方法，但由于总孔隙体积太小，无法准确测量气体流量，无法测量水合物在岩心中的分解速率。在模型研究方面，开发了预测甲烷-水混合物相态的数值程序。为预测含水合物多孔介质的采气动态，开发了两个数值计算程序。一种是基于相平衡理论，另一种是基于水合物分解动力学。通过模型计算，研究了一维岩心中水合物的分解行为。计算结果表明，影响沉积物中水合物分解速率的因素有3个：环境热传导、水合物晶体的分解速率和沉积物的渗透性。

项目成果

Yoshihiro MASUDA: "Numerical Calculation of Gas-Production Performance from Reservoins Containing Natural Gas Hydrates" Proc.SPE Western Regioral Meeting. SPE38291 (1997)

Yoshihiro MASUDA：“含天然气水合物储层天然气生产性能的数值计算”Proc.SPE 西部地区会议。

増田 昌敬: "メタンハイドレートからのガス産出挙動に及ぼす影響因子" 平成8年度石油技術協会春季講演会要旨集. 173 (1996)

Masataka Masuda：“甲烷水合物天然气生产行为的影响因素”日本石油技术学会 1996 年春季会议摘要 173 (1996)。

Yoshihiro MASUDA: "Development of a Numerical Model for Predicting Hydrate- Decomposition Behavior in Reservoirs" Proc.International Symposium on Methane Hydrates, JNOC-TRC. 185-1-185-11 (1998)

Yoshihiro MASUDA：“预测储层水合物分解行为的数值模型的开发”Proc.国际甲烷水合物研讨会，JNOC-TRC。

Yoshihiro MASUDA,Shigemi NAGANAWA et al.: "Factors Influencing Gas Production Behavior from Methane Hydrates" Abstr.1996 Tech.Meet.Jpn.Assoc.Pet.Technol. 173 (1996)

Yoshihiro MASUDA、Shigemi NAGANAWA 等人：“影响甲烷水合物产气行为的因素” Abstr.1996 Tech.Meet.Jpn.Assoc.Pet.Technol。

Yoshihiro MASUDA,Shigemi NAGANAWA et al.: "Numerical Calculation of Gas-Production Performance from Reservoirs Containing Natural Gas Hydrates" Proc.SPE Western Regional Meeting, SPE38291. (1997)

Yoshihiro MASUDA、Shigemi NAGANAWA 等人：“含有天然气水合物的储层的产气性能数值计算”Proc.SPE 西部地区会议，SPE38291。