Study on prevention and control measures of sandstone geothermal reinjection plugging

Abstract

In the process of geothermal tailwater reinjection of sandstone, the problem of plugging has been seriously restricting the continuous development of geothermal reinjection for many years, and the problems of plugging are complex and changeable. The plugging in the process of reinjection can be divided into physical plugging, chemical plugging, microbial plugging and gas plugging. Given these four types of blocking, according to the mechanism characteristics of the blocking caused by them, this paper puts forward corresponding blocking prevention measures and solves the current blocking problems by filtering, adding a scale inhibitor, intermittent reinjection, adding chlorine dioxide and regular lifting. In addition, the existing reinjection process and the equipment flow are relatively simple and cannot achieve the goal of efficient reinjection. Therefore, a complete set of reinjection processes is designed to ensure the efficient reinjection of sandstone geothermal tailwater. HIGHLIGHT Through theoretical analysis and simulation experiments, the prevention and control measures for various types of plugging are proposed, which lay a theoretical foundation for the high efficiency of geothermal tailwater.; The innovation lies in the design of a set of the special process flow for the geothermal reinjection of sandstone.;

Keywords

• blockage
• prevention and control measures
• sandstone geothermal
• simulation experiment
• tailwater reinjection