The Development of Wire-line Sampling Drilling Tool for Gas Hydrates by Hole Bottom Freezing with Development of Wire-line Sampling Drilling Tool for Gas Hydrates by Hole Bottom Freezing with Liquid Nitrogen as External Cold SourceGas Hydrates by Hole Bottom Freezing with Liquid Nitrogen as External Cold Source

Abstract:

According to the characteristics of existing environment and natures of gas hydrates, a new gas hydrates sampler with hole bottom freezing is developed. The sampling was realized by wire-line coring with liquid nitrogen as external cold source. The paper describes the freezing method, operating principle and the main structure features.