Abstract: A three-dimensional simulating device for the stratum stability in natural gas hydrate exploitation includes a three-dimensional model located in an environmental control unit, an axial pressure control unit, and a post-processing unit. An inner cavity of the three-dimensional model is divided into a sealed simulating cavity and a sealed axial pressure sealing cavity by an axial pressure sealing piston arranged in the inner cavity. A vertical well and a horizontal well stretch into the simulating cavity. The axial pressure control unit, the environmental control unit, and a plurality of sensors in the three-dimensional model are electrically connected to the post-processing unit.

Abstract: A natural gas hydrate drilling simulation device, includes a hydrate rock core simulation system, a drilling system, a drilling fluid injection system and a drilling fluid treatment system. The hydrate rock core simulation system includes a hydrate formation simulation wellbore, an artificial rock core, a water bath jacket and low temperature water bath. The drilling system includes a bracket, a high pressure rotary connecting device, a hydraulic device and a drilling device. The drilling fluid injection system includes a mud tank, a drilling fluid flowmeter, mud pumps and an overflow valve. The drilling fluid treatment system includes a high pressure sand remover, a back pressure and overflow control system, a gas-liquid separator, a dyer, a gas flowmeter, a liquid flowmeter and a mud treatment tank. This natural gas hydrate drilling simulation device performs simulation experiments under a variety of downhole working condition environments.

Abstract: A simulation device of an entire natural gas hydrate exploitation process includes a high pressure reaction kettle, a gas-liquid separation device, a hydrate accumulation simulation subsystem simulating a hydrate accumulation process, a hydrate formation drilling simulation subsystem simulating a hydrate formation drilling process, a hydrate exploitation simulation subsystem simulating a hydrate decomposition and gas production process, and a produced gas collecting and processing simulation subsystem simulating a produced gas collecting and processing process. A method for simulating an entire natural gas hydrate exploitation process includes a hydrate accumulation process, a hydrate formation drilling process, a hydrate exploitation process and a produced gas collecting and processing process.

Abstract: A natural gas hydrate drilling simulation device, includes a hydrate rock core simulation system, a drilling system, a drilling fluid injection system and a drilling fluid treatment system. The hydrate rock core simulation system includes a hydrate formation simulation wellbore, an artificial rock core, a water bath jacket and low temperature water bath. The drilling system includes a bracket, a high pressure rotary connecting device, a hydraulic device and a drilling device. The drilling fluid injection system includes a mud tank, a drilling fluid flowmeter, mud pumps and an overflow valve. The drilling fluid treatment system includes a high pressure sand remover, a back pressure and overflow control system, a gas-liquid separator, a dyer, a gas flowmeter, a liquid flowmeter and a mud treatment tank. This natural gas hydrate drilling simulation device performs simulation experiments under a variety of downhole working condition environments.

Abstract: A spraying device for quickly forming gas hydrates, includes a stable gas supply system, a saturated solution preparation system, a gas-liquid mixed sprayer, a temperature control system and a data collecting and processing system. Pressure atomization is achieved at a high atomization speed and the atomized fog drops are uniformly distributed within a scale range of 5-10 microns to form a gas-in-water contact mode, so as to effectively increase a gas-water contact superficial area and significantly shorten the induction time of forming the gas hydrates. The device achieves gas-liquid intensive mixing in a gas-liquid mixing cavity in a spray manner and consumes no energy, thereby reducing the total energy consumption of forming the gas hydrates and improving the energy consumption efficiency of forming the gas hydrates. The spraying device applies to thermodynamics and kinetics experiments of quick and continuous hydrate method gas separation and rapid formation of the gas hydrates.

Abstract: A device for simulating exploitation of a natural gas hydrate in a permeable boundary layer includes a high pressure reaction kettle, a formation simulation unit and an aquifer maintaining unit. A water bath jacket externally connected with constant temperature water bath is arranged on the outer wall of the high pressure reaction kettle for providing a necessary temperature condition for the high pressure reaction kettle. A simulative well at the center of the top of the high pressure reaction kettle is connected with liquid injection, gas injection, gas production and water production equipment. An aquifer interface at the bottom of the high pressure reaction kettle is connected to the aquifer maintaining unit through a pipeline. The simulation device simulates the geological environment of a hydrate reservoir, allowing comprehensive evaluation of hydrate exploitation under different formation permeability and different formation pressure gradients.

Abstract: A three-dimensional simulating device for the stratum stability in natural gas hydrate exploitation includes a three-dimensional model located in an environmental control unit, an axial pressure control unit, and a post-processing unit. An inner cavity of the three-dimensional model is divided into a sealed simulating cavity and a sealed axial pressure sealing cavity by an axial pressure sealing piston arranged in the inner cavity. A vertical well and a horizontal well stretch into the simulating cavity. The axial pressure control unit, the environmental control unit, and a plurality of sensors in the three-dimensional model are electrically connected to the post-processing unit.