期刊
ENERGIES
卷 15, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/en15041438
关键词
tight gas; high temperature; electric heating; heating mechanism; permeability enhancement
This study investigates the impact of high temperatures on the microstructure of tight sandstone formations, finding that heating to certain thresholds can significantly improve gas permeability. Electric heating is identified as a potential method for enhancing the productivity and exploitation efficiency of tight gas formations.
Although tight sandstone gas formations are abundant in China, their single-well productivities and exploitation efficiencies are restricted by water blocking from drilling and completion. At present, shut-in, chemical additive application, and hydraulic fracturing are the common approaches applied to handle this problem. However, these approaches are also characterized by low efficiencies or even cause secondary damage. In this study, the impact of high temperatures (of up to 800 degrees C) on the microstructure of a tight sandstone, including water blocking and gas permeability, are investigated through the electric heating of a simulated wellbore. The results show that the threshold temperature for fracturing of the tight sandstone is approximately 450 to 600 degrees C. Many secondary microcracks emerged near the wellbore beyond this temperature, improving the gas permeability, with some microcracks visible even after cooling. The gas permeability of the formation after heating to 800 degrees C increased by 456% and 3992% compared with the initial gas permeability and the water-blocking impacted gas permeability, respectively. This study demonstrates that electric heating is a potential method for improving the permeability of tight gas formations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据