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Differential air drilling coring device and method

An air drilling and coring device technology is applied in the direction of extracting undisturbed cores, earthwork drilling, etc., which can solve the problems of unsatisfactory sampling effect and inability to meet the needs of drilling and coring, so as to improve the core harvest rate and reduce scouring. , the effect of improving core quality

Active Publication Date: 2017-05-31
CHINA PETROCHEMICAL CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under air as the medium, domestic drilling and coring tools are single-sealed, and some are not even sealed, and the sampling effect is not ideal, which cannot meet the needs of drilling and coring under gas drilling conditions for oil and gas exploration in the future.

Method used

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  • Differential air drilling coring device and method
  • Differential air drilling coring device and method
  • Differential air drilling coring device and method

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Refer to attached figure 1 , the differential mechanism 1, the positioning pup joint 2, the outer cylinder assembly 4, and the coring bit 7 are connected together from top to bottom by threads to form an outer cylinder combination, and the suspension assembly 3, the inner cylinder assembly 5 and the core cutting mechanism 6 pass through The threads are connected up and down to form an inner cylinder combination. The differential mechanism 1 includes an inner polygon 11, an outer polygon 13, an upper joint 10 and a pressure joint 12. The drilling tool 9, the upper joint 10, the inner polygon 11 and the pressure joint 12 are sequentially connected by threads, and the outer polygon 13 The inner polygonal body 11 is set outside, and the inner polygonal body 11 and the outer polygonal body 13 are provided with mutually limiting ste...

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Abstract

The invention discloses a differential type air-drilling coring device and a differential type air-drilling coring method, wherein a differential mechanism, an orientation spool, an outer cylinder assembly and a coring dill bit are connected together up and down to form an outer cylinder assembly; a suspension assembly, an inner cylinder assembly and a core cutting mechanism are connected together up and down through threads to form an inner cylinder assembly; the suspension assembly is connected with the orientation spool through a suspension element; the whole inner cylinder assembly is suspended in the outer cylinder assembly; the core cutting mechanism is located in the position of the inner cavity of the coring dill bit; the whole set of coring device is in threaded connection with a drill tool. During the coring operation, the well drilling equipment drives the coring device to rotate to carry out the core-drilling work; after the core-drilling is finished, the suspension element is sheared off by pitching to ground and by virtue of the differential device of the coring device, and then the inner cylinder assembly descends so that the core cutting mechanism is enabled to work, and the rock core is protected against dropping out in the drilling process. The differential type air-drilling coring device and the differential type air-drilling coring method can be applied to the air-drilling coring field.

Description

technical field [0001] The invention relates to an air drilling coring device in the field of petroleum and natural gas exploration, in particular to a differential air drilling coring device and a method for using the differential air drilling coring device. Background technique [0002] Air drilling coring refers to stratum coring when air is used as the drilling medium. The cooling and lubricating properties of air are different from those of conventional liquid drilling fluids. Coring tools designed for air drilling are required. At present, the air drilling and coring devices used in China all use the lifting and core cutting method. The Chinese invention patent, the invention and creation name is "gas drilling and coring technology", the patent number is "200710049630.8", and the application date is "2007.07.30" A kind of coring process of lifting type core cutting mode is disclosed in the paper. This method of lifting and cutting cores is only suitable for coring in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B25/00
Inventor 许俊良薄万顺吴仲华韩通裴学良
Owner CHINA PETROCHEMICAL CORP
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