Simulation apparatus for natural gas hydrate formation drilling

A simulation apparatus for natural gas hydrate formation drilling, comprising a hydrate core simulation system, a drilling system, a drilling fluid injection system, and a drilling fluid treatment system; the hydrate core simulation system comprises a hydrate formation simulation borehole, an artificial core, a water bath clamping sleeve, and a low-temperature water bath; the drilling system comprises a frame, a high-pressure rotary coupling apparatus, a hydraulic apparatus, and a drilling apparatus; the drilling fluid injection system comprises a slurry tank, a drilling fluid flowmeter, a slurry pump, and an overflow valve; and the drilling fluid treatment system comprises a high-pressure desander, a backpressure and overflow control system, a gas-liquid separator, a drying device, a gas flowmeter, a liquid flowmeter, and a slurry treatment tank. The present simulation apparatus can implement simulation experiments corresponding to various downhole operating environments, is easy to operate and has a simple structure, and thus provides laboratory experiment data for the evaluation of natural gas hydrate drilling safety controls and the formulation of drilling solutions.