Large drift diameter built-in high-pressure sampling valve

Abstract

The invention discloses a large drift diameter built-in high-pressure sampling valve, which comprises a valve body, and is characterized in that a sampling core pipe is arranged in the valve body; an opening and a chute are formed on an upper wall of the valve body; the opening is communicated with the chute; the large drift diameter built-in high-pressure sampling valve is provided with a sealing sliding plate; an outline of the sealing sliding plate is matched with the shape of the opening; a sealing edge of the sealing sliding plate is a curved surface; small shafts at two ends of the sealing sliding plate are arranged in the chute and can rotate in the chute; and a sealing valve seat is arranged in the valve body. A special hard sealing structure is utilized, the sea bottom in-situ airtight sample core sampling equipment has excellent sealing characteristics under the seawater of 3,000 meters, sealing operation can be performed in the process of sampling, pollution-free and leakage-free acquisition of the sample core is realized, and the required original state and information of the sample taken from the sea bottom is guaranteed during a lab test, so that a real testing result is acquired; and in addition, extra complicated design is avoided, and the large drift diameter built-in high-pressure sampling valve has the advantages that the power supply is not required, the action is stable and reliable, and the sealing effect is good.

Description

technical field [0001] The invention relates to a large-diameter built-in high-pressure sampling valve used in ocean drilling and coring, especially suitable for in-situ drilling and sampling equipment on the seabed to implement pollution-free collection of in-situ rock cores on the seabed, and belongs to seabed natural gas hydrate and marine oil and gas investigation samples The technical field of design and manufacture of drilling acquisition devices. Background technique: [0002] The in-situ collection and on-site analysis technology of seabed sediments and cores can quickly detect CH in samples 4 、H 2 S and other gases and Cl - , SO 4 2- The abnormality and distribution characteristics of plasma provide fast and efficient geochemical evidence for the exploration of gas hydrate and oil and gas resources. However, the existing marine sediment collection technology mainly uses gravity pistons to collect sediments, and then extracts pore water in the laboratory by mea...

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