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Hydraulic control natural gas hydrate hole bottom frozen rope core drill and coring method

A technology for core drilling tools and hydrates, applied in the direction of extracting undisturbed core devices, earthwork drilling and mining, etc., can solve problems such as difficult implementation, poor feasibility, and unguaranteed reliability, so as to improve the core recovery rate and high feasibility , good freezing effect

Inactive Publication Date: 2015-11-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of cold source injection is less feasible, and by changing the mechanical structure of the drilling tool to use the pressure of the flushing fluid as a power to inject the cold source around the core tube and freeze the core, it is difficult to achieve, and the reliability Can not guarantee

Method used

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  • Hydraulic control natural gas hydrate hole bottom frozen rope core drill and coring method
  • Hydraulic control natural gas hydrate hole bottom frozen rope core drill and coring method
  • Hydraulic control natural gas hydrate hole bottom frozen rope core drill and coring method

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Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, in this embodiment, dry ice is used as the cold source, and alcohol is used as the cooling aid catalyst and the refrigerant; dry ice is used as the cold source, and alcohol is used as the cooling aid catalyst and the refrigerant. The embodiment is composed of the inner pipe assembly and the outer pipe assembly. The inner tube assembly includes a salvage mechanism, an ejector positioning mechanism, a suspension mechanism, a movable cartridge mechanism, a single-action mechanism, an adjustment mechanism, a cold source storage mechanism and a hole bottom freezing mechanism;

[0035] The salvage mechanism is composed of a fishing spear head 2, a first elastic pin 3 and a first bullet card recovery pipe 4, and the fishing spear head 2 is connected with the first bullet card recovery pipe 4 through the first elastic pin 3; The spear head 2 is connected, and the process of putting the inner tube assembly of the drilling tool into the hole and recover...

Embodiment 2

[0052] Such as Figure 5 As shown, this embodiment adopts a mixture of alcohol and dry ice as a cold source or a phase-change fluid such as liquid nitrogen that can quickly vaporize and absorb heat as a cold source. This embodiment is composed of two parts: an inner tube assembly and an outer tube assembly Large composition, the inner tube assembly includes: salvage mechanism, bullet positioning mechanism, suspension mechanism, movable bullet mechanism, single-action mechanism, adjustment mechanism, cold source storage mechanism and hole bottom freezing mechanism. Wherein the salvage mechanism, the cartridge positioning mechanism, the suspension mechanism, the movable cartridge mechanism, the single-action mechanism, the regulating mechanism and the hole bottom freezing mechanism are the same as those in Embodiment 1.

[0053] The cold source storage mechanism is composed of an upper handle 33 in the alcohol cavity, an alcohol cavity body pipe 35, a lower handle 36 in the alco...

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Abstract

The invention discloses a hydraulic control natural gas hydrate hole bottom frozen rope core drill and a coring method, which are particularly suitable for drilling and coring of natural gas hydrates of deep sea and permafrost lands. The hydraulic control natural gas hydrate hole bottom frozen rope core drill uses dry ice as a cold source, uses ethyl alcohol as cooling catalyst and secondary refrigerant, and can achieve rapid freezing of natural gas hydrate rock cores. The hydraulic control natural gas hydrate hole bottom frozen rope core drill achieves to rapidly core without lifting a drill by combining rope coring and hole bottom freezing. The hydraulic control natural gas hydrate hole bottom frozen rope core drill drives a control valve machine to achieve the process that the cold source is injected into a refrigeration mechanism by adopting drilling fluid column pressure, and has high feasibility. An inner pipe assembly does not rotate when drilling, prevents hydrate rock cores from being damaged because of mechanical force which is produced by a drill in a large extent, thereby more effectively improving recovery rate of rock cores, integrity and representative, and can rapidly obtain the rock cores on the ground by adopting a split core barrel mode to rapidly sample on the ground.

Description

technical field [0001] The invention relates to a wireline coring tool and a coring method for natural gas hydrate hole bottom freezing, and is especially suitable for natural gas hydrate drilling and coring in deep sea and land permafrost. Background technique [0002] With the rapid development of the economy, the consumption of energy is also increasing day by day. Conventional energy sources such as oil, coal, and natural gas are consumed in large quantities. Judging from their remaining reserves, conventional energy sources cannot continue to support modern industry for a long time, and the amount of natural gas hydrate resources is extremely high. Natural gas hydrate is abundant, and it produces carbon dioxide and water after combustion, which is a kind of clean energy, so natural gas hydrate is regarded as the main energy source in the future. Natural gas hydrates form and exist in high-pressure and low-temperature environments. When the temperature or pressure change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B25/08E21B25/02
Inventor 孙友宏王元郭威贾瑞陈光华
Owner JILIN UNIV
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