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Effect of Perforation Interval Design on Gas Production from the Validated Hydrate-Bearing Deposits with Layered Heterogeneity by Depressurization
Geofluids ( IF 1.7 ) Pub Date : 2020-06-20 , DOI: 10.1155/2020/8833884
Yingli Xia 1 , Tianfu Xu 1 , Yilong Yuan 1 , Xin Xin 1
Affiliation  

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.

中文翻译:

射孔间距设计对经验证的层状非均质性水合物矿床降压产气的影响

天然气水合物被认为是解决世界能源需求的最佳潜在替代资源之一。加拿大 Mallik 站点的现有地质数据表明水合物储层岩石物理性质的垂直非均质性。根据 Mallik 2L-38 井测井资料和样品分析结果,建立了具有地质描述性的含水合物沉积物二维模型,研究了天然气采收引起的水合物储层多相流动行为以及射孔间隔对天然气的影响。生产性能。首先,通过匹配 Mallik 2007 试验中的实测数据,对构建的渗透率、孔隙度和水合物饱和度垂直非均质结构模型进行验证。模拟结果中观察到的水合物储层中残留甲烷过多,表明产气效率不足。为了更有效地从水合物储层中回收甲烷,基于经过验证的储层模型研究了射孔间隔对长期天然气生产性能的影响。模拟结果表明,射孔段的位置和长度对水合物的解离行为有显着影响,而产气性能主要受射孔段长度的影响。具体而言,射孔间隔设置在水合物储层与下伏水饱和带交界面的情况下,具有良好的释气性能。通过增加 5 m、8 m 和 10 m 的射孔间隔长度,
更新日期:2020-06-20
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