Patent ID: 8074739

Claim:
A sampler for gas hydrates by hole bottom freezing comprising: a fisher, a wire-line coring mechanism, an outer barrel, an inner barrel assembly located inside the outer barrel comprising: a refrigeration portion, a low temperature control portion, and a frozen insulation sample portion, wherein a refrigerant in the refrigeration portion is injected into the frozen insulation sample portion under a control of the low temperature control portion, so that a cooling medium in the frozen insulation sample portion is always kept under a predetermined temperature, and a core sample of gas hydrates in the frozen insulation sample portion and surrounded by the cooling medium is frozen at the bottom of a drill hole, and wherein the low temperature control portion comprises a low-temperature control module, a switch sensor, a temperature sensor, and a temperature control electromagnetic valve, wherein the switch sensor, the temperature sensor, and the temperature control electromagnetic valve are electrically connected to the low-temperature control module respectively.