天然气水合物非干扰绳索式保温保压取样钻具的研究

Development of Noninterference Wireline Pressuretemperaturepreserving Sampling Drilling Tool for Gas Hydrate

摘要:

由于天然气水合物存在环境和性质的特殊性，使保温保压取样技术成为获得原位天然气水合物最有效的方法之一。保温保压取样钻具是获得天然气水合物真正物化特性的主要器具。通过多年对天然气水合物保温保压取样钻具的试验研究，设计了专门用于取海底沉积物和未成岩地层中水合物的非干扰绳索式保温保压取样钻具。介绍了钻具的结构、特点，及其配套的保温保压系统关键机构的功能、特点。对取心工艺和进行的海上功能性试验进行了详细说明，试验结果达到了设计要求。

Abstract:

Due to the existing environment and special properties of gas hydrate, the only way to recover in-situ gas hydrate is to depend on the pressure-temperature-preserving sampling technique. And the pressure-temperature-preserving sampling system is the most important equipment to get the real physical and chemical properties of gas hydrate. Through the research on pressure-temperature-preserving sampling system for gas hydrate for many years, a non-interference wire-line pressure-temperature-preserving undisturbed sampling drilling tool was designed to get seabed sediments and hydrates in non-diagenetic formations. The sampling tool was introduced about its structure and characteristics, and the functions and features of the key mechanisms for matching pressure-temperature-preserving system were presented. The paper also detailed the coring technology as well as offshore function test and the test results met the design requirements.