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Pressure-maintaining coring device

A coring and core technology, applied in the field of biomass energy technology services, can solve the problems of core damage and poor practicability, and achieve the effect of preventing damage, strong practicability and good effect

Active Publication Date: 2022-01-28
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a pressure-holding coring device, which aims to solve the problem of poor practicability of the existing pressure-holding coring device due to easy damage to the rock core

Method used

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Embodiment Construction

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0038] Please also refer to Figure 1 to Figure 5 , the pressure-holding coring device provided by the present invention will now be described. The pressure maintaining coring device includes an outer tube unit 10 , an inner tube unit 20 and an anti-twisting component 30 . Wherein, the outer tube unit 10 includes an outer cylinder 11 and a drill bit 12; the outer cylinder 11 is arranged along the vertical direction, and the outer cylinder 11 is provided with a first accommodating cavity 111, and is provided at the bottom of the outer cylinder 11 with the first acc...

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Abstract

The invention provides a pressure-maintaining coring device. The pressure-maintaining coring device comprises an outer pipe unit, an inner pipe unit and an anti-twist-off assembly, wherein the outer pipe unit comprises an outer cylinder and a drill bit; a first containing cavity is formed in the outer cylinder. The inner pipe unit comprises an inner cylinder, a shock-proof assembly, a cut-off assembly, a sealing assembly and a clamping assembly. The shock-proof assembly is used for abutting against the outer wall of the rock core entering the second containing cavity so as to eliminate the vibration effect of the inner cylinder on the rock core. And the cutting assembly is used for cutting the rock core entering the second accommodating cavity. And the sealing assembly is used for automatically closing after the cutting assembly cuts the rock core and drives the cut rock core to move upwards in the inner cylinder, so as to seal the second accommodating cavity. The clamping assembly is used for clamping the rock core in the second containing cavity after the rock core is cut. The anti-twist-off assembly is used for eliminating twisting force transmitted from the outer cylinder to the inner cylinder. The pressure-maintaining coring device provided by the invention can effectively protect a rock core, can effectively reflect a real underground condition, and is good in pressure-maintaining coring effect and relatively high in practicability.

Description

technical field [0001] The invention belongs to the technical field of biomass energy technology services, and in particular relates to a pressure-maintaining coring device. Background technique [0002] Shale gas refers to organic matter-rich, mature dark mud shale or high-carbon mud shale, which has a certain commercial value due to the adsorption of organic matter or the existence of fractures and matrix pores in the rock, so that it is stored and preserved. , pyrolysis, and natural gas of mixed origin, and shale gas has very broad development prospects. The extraction process of shale gas needs to be cored by a pressure-holding coring device. [0003] In the prior art, the pressure-holding coring device usually includes a coring outer cylinder and a coring inner cylinder, and the sealing structure adopted by the coring inner cylinder occupies a large space, which limits the diameter of the drilled core, because the coring inner cylinder The size of the core is fixed, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B25/10E21B25/08
CPCE21B25/10E21B25/08
Inventor 陶佳张金川王锡伟史淼
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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