Ground wellhole dedicated protective pipe for gas extraction of mining-induced area
AssigneeShandong University of Science and Technology
InventorsWei Lu, Qianting Hu, Guansheng Qi, Weimin Cheng, Jinliang Li, Dong Wang, Zhen Liu
Life of this patent
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Abstract
A ground wellhole dedicated protective pipe, disposed inside a ground wellhole for gas extraction of a mining-induced area, includes a casing, and a chain inside the casing and slidable relative to the casing. The chain includes a chain formed by a plurality of chain drums through serial connection, and a detachable connecting piece connecting between chains. A plurality of air holes is opened in the chain drum along an axial direction of the chain drum.
Claims8
A ground wellhole dedicated protective pipe for gas extraction of a mining-induced area, wherein the ground wellhole dedicated protective pipe for gas extraction of the mining-induced area is disposed inside a ground wellhole for gas extraction of the mining-induced area, the ground wellhole dedicated protective pipe for gas extraction of the mining-induced area comprising:
- a casing;
- and
- a chain that is disposed inside the casing and slidable relative to the casing, the chain comprising
- a plurality of chain drums, and
- connecting pieces, wherein
- a plurality of air holes are opened in the chain drum along an axial direction of the chain drum,
- the connecting piece is a connection ring,
- the connection ring comprises
- a closed connection ring, and
- an open-closed connection ring,
- the plurality of chain drums are connected through the closed connection rings, and
- the adjacent chains are connected through the open-closed connection rings.
Dependencies are inferred from the claim text.