Rope rotation type heat preservation and pressure holding sampling drilling tool

Abstract

The present invention discloses a rope rotation type heat preservation and pressure holding sampling drilling tool, and is provided with a sampling outer tube assembly and a sampling inner tube assembly. Wherein an elastic clamp in the sampling inner tube assembly is embedded in an elastic clamp chamber in the sampling outer tube assembly, during drilling, the sampling outer tube assembly drives the sampling inner inner tube assembly to synchronously rotate through the elastic clamp. A high-pressure resistant thermal insulation sampling tube assembly (13) in the sampling inner tube assembly adopts vacuum heat preservation technology, and a nano-insulation coating is coated on inner and outer surfaces of a sample pressure retaining tube (36) to enhance heat preservation of a sample. A platevalve sealing system (14) and the sample holding tube (36) and a pressure compensating system (12) in the sampling inner tube assembly form a closed pressure holding space chamber, to provide pressure holding of the sample. The tool enables a high success rate of natural gas hydrate heat preservation and pressure holding sampling by designing a simple and reliable rotation system (9), the pressure compensation system (12) and the plate valve sealing system (14), and solves the problem that gas hydrate exploration and sampling has poor heat preservation and pressure holding performance and lowefficiency.

Description

technical field [0001] The invention belongs to the field of drilling, and relates to a rope rotary type heat preservation and pressure maintaining sampling drilling tool, which is suitable for drilling and sampling construction of natural gas hydrates such as land, lakes, rivers and oceans. Background technique [0002] At present, the important impact of gas hydrate on energy and environment has attracted the attention of many countries in the world. my country has abundant natural gas hydrate reserves, but the exploration and sampling of natural gas hydrates in sea areas mainly relies on foreign technologies, which seriously restricts the exploration of natural gas hydrates in my country. has very important strategic significance. [0003] Drilling and sampling natural gas hydrate in land, lakes, rivers, oceans and other areas requires maintaining the formation pressure and temperature of the sample during the sampling process, which is difficult to achieve with conventio...

AI Technical Summary

Problems solved by technology

[0003] Drilling and sampling natural gas hydrate in land, lakes, rivers, oceans and other areas requires maintaining the formation pressure and temperature of the sample during the sampling process, which is difficult to achieve with conventional samplers. At present, domestic natural gas hydrate sampling drilling tools have thermal insulation and pressure preservation Disadvantages of low sample collection rate and poor heat preservation and pressure holding performance

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