Development and application test of controllable local hot melt bit

Abstract:

Core is the most intuitive and practical data for understanding geological strata and ore bearing characteristics. The heart rate of conventional coring tools used in complex geological resource exploration often fails to meet the requirements of standards or design. When conducting mineral resource exploration in mudstone， mudstone shale interbedded and other mud prone formations， scaling occurs on the inner wall of the rope drill pipe， causing the inner pipe to not be fully inserted and unable to be used； The miniaturized single action double tube coring drilling tool is relatively short and only used for coring in mineral layers； The use of a single tube coring drilling tool is a "squeezing force" jamming method between the core， retaining spring （or rock powder， retaining material）， and drill bit （or core tube）， which often leads to uncertainty in the recovery rate of the secondary core due to the high degree of uncertainty in the fit between the three， and the core recovery rate cannot be guaranteed. To this end， a controllable local hot melt drill bit for drilling using dry and wet drilling methods was developed by utilizing the temperature at the bottom of the hole and the bonding temperature of the adhesive ≤2 times the melting point temperature of the adhesive ≤2 times the allowable temperature of the dimmonds materialthe. The core clamping method was optimized to use a “lifting” core to seal the inner diameter of the drill bit with a core claw， and core sampling experiments were conducted in combination with a single tube core tube. The core sampling rate reached over 75%， solving the technical problem of weak and uncertain core clamping in conventional single tube core tubes. This provides a new approach for drilling engineering construction in similar geological formations， which can be referenced， promoted， and popularized.