Wellhead drill pipe sealer used for pneumatic down-the-hole hammer drilling

Abstract

The invention discloses a wellhead drill pipe sealer used for pneumatic down-the-hole hammer drilling. The wellhead drill pipe sealer comprises a left sealing part and a right sealing part which are each in a semicircular shell shape; one ends of both the left sealing part and the right sealing part are hinged, and the other ends of both the left sealing part and the right sealing part are fixedly connected through bolts to form a circular structure; the left sealing part and the right sealing part are of the same structure; the left sealing part is formed by enclosing of an upper semicircular plate, a lower semicircular plate and an arc-shaped side plate and is a semicircular shell with an opening face; semicircular latex sealing blocks are embedded in the left sealing part, and the shapes of the latex sealing blocks are matched with the shape of the semicircular shell; a semicircular notch is formed in the circle center of each latex sealing block, rectangular notches are formed in both an upper semicircular plate and a lower semicircular plate and are externally tangent with the semicircular notches, and the diameter of each semicircular notch is equal to the length of the long side of each rectangular notch. Therefore, the two latex sealing blocks are pressed together tightly when the left sealing part and the right sealing part are closed, and the better sealing effect is achieved on the contact surface.

Description

technical field [0001] The invention belongs to the field of pneumatic down-the-hole hammer drilling, in particular to a wellhead drill pipe sealer for pneumatic down-the-hole hammer drilling. Background technique [0002] At present, rapid ground drilling has become a new technology for mine emergency rescue, opening up a "life channel" for mine emergency rescue, especially the perfect rescue of mine disasters in Chile and Pingyi mine disaster in my country, which proves that this technology is fast and effective . However, the opening of the "life channel" is only a key step in mine rescue. To rescue the trapped people, it is necessary to establish an "escape channel", that is, a large-diameter well (well diameter not less than φ650mm). At present, the main technology of "escape channel" is positive circulation pneumatic down-the-hole hammer drilling technology and reverse circulation pneumatic down-the-hole hammer drilling technology. [0003] Both of these technologies ...

AI Technical Summary

Problems solved by technology

[0003] Both of these technologies need to inject high-pressure air from the ground through an air compressor to discharge the cuttings at the bottom of the well. Since the cuttings need an air velocity of at least 15m / s, during the drilling process, the wellhead reaction The exhaust air flow rate is fast, and the current wellhead seal cannot achieve a good sealing effect, which has a bad impact on the health of the wellhead drilling workers and construction conditions

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