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Pneumatic circulation freezing type natural gas hydrate wire-line coring drilling tool and coring method

A technology of cyclic freezing and coring drilling tools, which is applied in the direction of extracting undisturbed cores, earthwork drilling and mining, etc., can solve the problems of low freezing efficiency, small freezing chamber volume, and unguaranteed reliability, and achieve the effect of improving freezing efficiency

Inactive Publication Date: 2015-09-23
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small volume of the freezing chamber around the core tube, and the refrigerant in it relies on natural convection heat exchange with the low-temperature refrigerant in the upper cold storage chamber to maintain low temperature, the freezing efficiency is low and the reliability cannot be guaranteed

Method used

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  • Pneumatic circulation freezing type natural gas hydrate wire-line coring drilling tool and coring method
  • Pneumatic circulation freezing type natural gas hydrate wire-line coring drilling tool and coring method
  • Pneumatic circulation freezing type natural gas hydrate wire-line coring drilling tool and coring method

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Embodiment Construction

[0036] The pneumatic circulation refrigeration type natural gas hydrate wireline coring tool of the present invention adopts dry ice as the cooling source, and alcohol as the carrier refrigerant and cooling aid catalyst;

[0037] Such as Figure 1 to Figure 8 As shown, the pneumatic circulating refrigeration type natural gas hydrate wireline core drilling tool of the present invention is composed of an inner tube assembly and an outer tube assembly, wherein the inner tube assembly includes a salvage mechanism, a cartridge positioning mechanism, a suspension mechanism, a single-action Mechanism, regulating mechanism, alcohol storage mechanism, cold storage mechanism, hole bottom freezing mechanism and pneumatic cycle control mechanism;

[0038] The salvage mechanism is composed of a spearhead 2, a first elastic pin 3 and a card recovery tube 4, the spearhead 2 and the card recovery tube 4 are connected through the first elastic pin 3; , through the connection between the overs...

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Abstract

The invention discloses a pneumatic circulation freezing type natural gas hydrate wire-line coring drilling tool and a coring method. The drilling tool is composed of an inner pipe assembly and an outer pipe assembly. Dry ice is adopted by the drilling tool to serve as a cold source, ethyl alcohol serves as a secondary refrigerant, high-pressure carbon dioxide generated when the dry ice is mixed with the ethyl alcohol is used for pushing the ethyl alcohol to flow circularly, the freezing energy is transmitted to a freezing cavity continuously from a cold storage cavity where the dry ice is located, and quick core freezing is achieved; a hole bottom freezing method and a wire-line coring process are combined, quick coring can be achieved without lifting the drilling tool, an inner pipe does not rotate in the drilling process, and mechanical disturbance of aquo-complex cores is reduced. The pneumatic circulation freezing type natural gas hydrate wire-line coring drilling tool is reasonable in structure, high in freezing efficiency and simple in operation process.

Description

technical field [0001] The invention relates to a pneumatic circulation refrigeration type natural gas hydrate rope coring drilling tool and a coring method, which is especially suitable for natural gas hydrate drilling and coring in ocean and land permafrost. Background technique [0002] In the context of the rapid development of the global economy, the consumption of petrochemical energy remains high. From the perspective of its proven remaining reserves, conventional petrochemical energy cannot support the survival and development of modern industry for a long time, and the resources of natural gas hydrate are extremely high. Abundant and clean energy, so natural gas hydrate is regarded as an alternative energy source in the future. Natural gas hydrates form and exist in high-pressure and low-temperature environments. If the temperature and pressure conditions exceed the equilibrium conditions, natural gas hydrates will decompose. Therefore, obtaining high-fidelity natur...

Claims

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Application Information

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IPC IPC(8): E21B25/08E21B25/02
Inventor 郭威陈光华孙友宏王元贾瑞
Owner JILIN UNIV
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