Annular multi-field coupling simulation drilling experiment method and apparatus through horizontal directional drilling

The invention provides an annular multi-field coupling simulation drilling experiment method through horizontal directional drilling. The method comprises the steps: building an experiment environment, conducting state initialization, and conducting mutual coupling motion analysis between a drilling rod and slurry, between a drilling rod and rock debris and among slurry, a drilling rod and rock debris by adjusting the slurry input speed, adjusting rock debris injection speed and changing the mass of a weighting counterweight. The invention also provides an annular multi-field coupling simulation drilling experiment apparatus through horizontal directional drilling. The apparatus comprises a slurry circulatory system, a drilling tool revolution system, a rock debris injection system, a slurry flow field monitoring system and an image processing system. The distribution situation of annular slurry flow fields, the spatial movement form of a drilling rod and the motion state of a rock debris bed can be collected and analyzed in real time according to mutual coupling interaction among a drilling rod, rock debris and slurry in an annular space during horizontal directional drilling (HDD).