Sealed sampling device for gas sample

Abstract

The invention discloses a sealed sampling device for a gas sample. The sealed sampling device comprises an outer pipe, an inner pipe and a double-layer pipe, wherein the outer pipe comprises a connecting mandrel for controlling slurry to enter and exit from a channel, a drill bit and a connecting pipe assembly positioned between the connecting mandrel and the drill bit; the inner pipe at least comprises a connecting sleeve, an upper ball valve, a sealing pipe and a lower ball valve; one end of the connecting sleeve is rotatably connected to the connecting mandrel in a sleeving manner; a core barrel is arranged between the upper ball valve and the lower ball valve, and serves as a storage carrier of a core; the core barrel can be sealed by closing the upper ball valve and the lower ball valve; the tail end of the double-layer pipe is against the connecting mandrel and can move back and forth under the control of the connecting mandrel; and a control element for controlling the opening and closing of the upper ball valve and the lower ball valve is arranged at the front end of the double-layer pipe, so that the upper and lower ball valves are opened or closed by moving the control element forwards or backwards. Therefore, the device is compact in structure, good in seal effect and wide in application range; and during drilling, only the outer pipe rotates and the rest of components do not rotate, thereby ensuring that the core can smoothly enter the core barrel.

Description

technical field [0001] The invention relates to the technical field of drilling tools, in particular to a gas sample airtight sampling device. Background technique [0002] Coring drilling is the most direct method to obtain the target sample and analyze its properties, but after the coring tool obtains the gas or liquid sample in the target hole section, the coring tool needs to seal the rock sample in situ, and then raise the hole for analysis . [0003] At present, for the airtight coring device, the relevant domestic and foreign documents and patents retrieved are as follows: Chinese patent (201410739874.9) airtight coring device for testing the content of coalbed methane and rock formation gas in ground drilling, which involves airtight coring of gas samples in solid rock cores device, but the airtight valve on the device needs to be pushed by a solid core to close, and the upper airtight valve can only be triggered by a solid core and greater than the length of the in...

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Problems solved by technology

[0003] At present, for the airtight coring device, the relevant domestic and foreign documents and patents retrieved are as follows: Chinese patent (201410739874.9) airtight coring device for testing the content of coalbed methane and rock formation gas in ground drilling, which involves airtight coring of gas samples in solid rock cores device, but the airtight valve on the device needs to be pushed by a solid core to close, and the upper airtight valve can only be triggered by a solid core and greater than the length of the inner cylinder. For the sampling length that does not reach the design or there is only gas sample or gas-liquid mixture in the rock sample Under such circumstances, the upper airtight valve cannot be closed, and the purpose of airtight coring cannot be achieved.

[0004] Chinese patent (ZL201010101528.X) an underground coal seam airtight credit-taking device and its use method, which relates to an airtight device for underground coal seam coring. The piston assembly of the device will misoperate the lower closing mechanism under the action of its own weight, which will affect the entry of the core into the inner cylinder.

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