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Natural gas hydrate hole-bottom refrigerating liquid moving rope coring drill tool and coring method

A core drilling tool and hydrate technology, applied in the direction of extracting undisturbed core devices, earthwork drilling and mining, etc., can solve the problems of poor control of cold source injection process, etc., and achieve the goal of improving core recovery rate, avoiding damage, and high feasibility Effect

Inactive Publication Date: 2015-12-16
JILIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

The cold source injection process of the frozen hole bottom sampler that adopts the rope coring method proposed so far is not easy to control. At present, there is no high-reliability frozen bottom rope sampler for natural gas hydrate that can be used for frozen sampling of land and ocean hydrates. Core drill

Method used

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  • Natural gas hydrate hole-bottom refrigerating liquid moving rope coring drill tool and coring method
  • Natural gas hydrate hole-bottom refrigerating liquid moving rope coring drill tool and coring method
  • Natural gas hydrate hole-bottom refrigerating liquid moving rope coring drill tool and coring method

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Embodiment Construction

[0029] wall reference figure 1 , figure 2 , image 3 and Figure 4 As shown, 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 control mechanism, a suspension mechanism, a steel ball positioning mechanism, a single-action mechanism, an adjustment mechanism, and a cold source storage mechanism And the freezing mechanism at the bottom of the hole;

[0030] The salvage mechanism is composed of the spear head 2 and the first inner receiver 3. The spear head 2 and the first inner receiver 3 are connected through threads; In the hole and recovery; drive the core pipe 43 to move upwards during the salvage mechanism.

[0031] The control mechanism is composed of the first inner receiver 3, the control piston 4, the first spring 9, the control valve 10 and the gravity tube 11. The first inner receiver 3 and the gravity tube 11 are connected by threads, and the control piston 4 is ...

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Abstract

The invention discloses a natural gas hydrate hole-bottom refrigerating liquid moving rope coring drill tool and a coring method and is suitable for natural gas hydrate drilling and coring of permanent frozen layers in deep sea and on land. Pure freeze-sampling is adopted, dry ice and alcohol are adopted as a cold source and freezing-assistant catalyst and secondary refrigerant, so that quick freezing of natural gas hydrate rock core can be realized; rope coring is combined with hole-bottom freezing, so that quick coring without drill lifting is realized; pressure of drilling liquid is adopted to drive a control valve mechanism to inject the cold source into a freezing mechanism, so that feasibility is high. An inner pipe assembly does not rotate back during drilling, so that damage to the hydrate rock core caused by mechanical force generated when the drill tool rotates back is avoided greatly, and coring efficiency is improved effectively.

Description

technical field [0001] The invention relates to a rope core drilling tool and a coring method for freezing the bottom of a natural gas hydrate hole through hydraulic control, and is especially suitable for natural gas hydrate drilling and coring in deep sea and land permafrost. Background technique [0002] With the increasing demand for energy in modern industry, conventional energy such as oil, coal and natural gas can no longer meet the demand. With its abundant resources, natural gas hydrate has become a world-recognized energy source that can become a conventional energy source such as oil, coal and natural gas in the future. Energy alternatives. Natural gas hydrates form and exist in high-pressure and low-temperature environments. According to the pressure stabilization characteristic curve of natural gas hydrate, if the temperature or pressure condition changes beyond the equilibrium condition, it will lead to the decomposition of natural gas hydrate. At present, na...

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Application Information

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IPC IPC(8): E21B25/08E21B25/02
Inventor 贾瑞孙友宏郭威王元陈光华
Owner JILIN UNIV
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