| Abstract |
The development of geothermal resources in Xiong'an New Area faces multiple drilling technology challenges, mainly reflected in the dual pressure of complex geological conditions and environmental protection. Deep geothermal reservoirs generally have high-temperature and high-pressure characteristics (with temperatures exceeding 150℃ in some areas), and carbonate fracture reservoirs are prone to well leakage and well collapse and other complex downhole situations, seriously affecting the drilling core and logging operations; the target reservoir rocks have high hardness and strong abrasiveness, which seriously affect the mechanical drilling speed; wellbore instability and high downhole temperatures make it difficult to control the performance of drilling fluids. In response to complex geological conditions, detailed geological research should be carried out and wellbore structures should be optimized; for high-temperature environments, high-temperature resistant screw drill tools should be used in combination with high-temperature resistant drilling fluid systems; for non-target fracture reservoirs, while drilling leak plugging technology should be adopted, and nanometer plugging materials and fiber-reinforced plugging agents should be used in conjunction; for karst geothermal reservoirs, controlled pressure drilling technology can be utilized, and water, water-filled air, and double-wall drill pipe drilling technologies can be used to solve the problem of formation leakage; in terms of environmental protection, the focus should be on the harmless treatment of drilling fluids and the application of closed-loop systems to reduce waste emissions. |