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Comparisons of Different Simulated Hydrate Designs for Class-1 Gas Hydrate Deposits
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jngse.2020.103225
Cheng-Yueh Wu , Bieng-Zih Hsieh

Abstract Hydrates can be modeled as an extremely-high-viscosity oil-phase component or a solid-phase component. The fact of the support from a solid hydrate on the formation strength can be proved by comparing different hydrate phase design models. The purpose of this study is to compare the production behaviors and geomechanics effects between the oil-phase and the solid-phase hydrate models in order to investigate the support of solid hydrates on the formation deformation and seabed subsidence. In this study, a modification method is proposed to modify the parameters of initial flowing-phase saturations and the corresponding relative permeability curves used in the solid-phase hydrate model to avoid a problem of overestimated water production and to achieve the calculation agreement between two different hydrate design models. The effects of different hydrate phase designs on the production profiles and the formation deformation of a Class-1 hydrate deposit is studied in the cases with coupling the geomechanics module. We found that the cumulative gas production is slightly higher in the coupled solid-phase hydrate model than that in the coupled oil-phase hydrate model. The observations of the seabed subsidence from the two coupled hydrate models show that the quantity of seabed subsidence of the coupled solid-phase hydrate model is lower than that of the coupled oil-phase hydrate model, which leads to the proven of the fact of the support of solid hydrates on the formation strength.

中文翻译:

1 类天然气水合物矿床不同模拟水合物设计的比较

摘要 水合物可以模拟为极高粘度的油相组分或固相组分。通过比较不同的水合物相设计模型,可以证明固体水合物的支持对地层强度的影响。本研究的目的是比较油相和固相水合物模型的生产行为和地质力学效应,以研究固体水合物对地层变形和海底沉降的支持。本研究提出了一种修正方法来修正固相水合物模型中使用的初始流动相饱和度参数和相应的相对渗透率曲线,以避免高估产水量的问题,并实现两种不同的计算一致性。水合物设计模型。在耦合地质力学模块的情况下,研究了不同水合物相设计对一级水合物矿床的生产剖面和地层变形的影响。我们发现耦合固相水合物模型的累积产气量略高于耦合油相水合物模型。两种水合物耦合模型对海底沉降的观测表明,固相水合物耦合模型的海底沉降量低于油相水合物耦合模型的海底沉降量,从而证明了固体水合物对地层强度的支持。我们发现耦合固相水合物模型的累积产气量略高于耦合油相水合物模型。两个耦合水合物模型对海底沉降的观测表明,耦合固相水合物模型的海底沉降量低于耦合油相水合物模型的海底沉降量,从而证明了固体水合物对地层强度的支持。我们发现耦合固相水合物模型的累积产气量略高于耦合油相水合物模型。两个耦合水合物模型对海底沉降的观测表明,耦合固相水合物模型的海底沉降量低于耦合油相水合物模型的海底沉降量,从而证明了固体水合物对地层强度的支持。
更新日期:2020-05-01
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