A novel hydrate drilling simulator was built to investigate the drilling process in the hydrate-bearing sediments. The simulator consists of a high pressure vessel, a drilling system, a drilling fluid injection system and a drilling fluid treatment system. The simulator can be used to simulate the drilling process in the hydrate reservoir. The drilling process in TBAB-hydrate-bearing sediments was experimentally studied and visually observed with different temperature of the drilling fluid. The TBAB-hydrate-bearing sediments were prepared by mixing the TBAB solution and quartz sands under the temperature of 4 ℃ in the high pressure vessel. The drilling simulation was carried out by keeping the environment temperature constant at 4 ℃. It was found that the temperature of the drilling fluid significantly affects the stability of the drill hole. The drill hole collapses obviously at the temperature of 8 ℃ of the drilling fluid.
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Zhang et al. (2019) studied this question.
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