Inner blowout prevention double floating valves of double-wall drill pipe
A double-wall drill pipe, double-floating technology, used in earth-moving drilling, wellbore/well valve devices, wellbore/well components, etc. blowout effect
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[0026] Example one
[0027] Such as figure 1 , figure 2 As shown, the present invention proposes a double-walled drill pipe internal blowout prevention double floating valve 100. The double floating valve 100 includes an upper valve seat 1, a lower valve seat 2 and a coaxial slide between the upper and lower valve seats. The floating valve core 3; the upper and lower valve seats are cylindrical, the center of the upper valve seat 1 is provided with a first axial through hole 11, and the center of the lower valve seat 2 is provided with a second axial through hole 21 (in this In an embodiment, the second axial through hole 21 may be a stepped hole with a larger upper portion and a smaller lower portion. The floating valve core 3 includes an outer positioning sleeve 31 coaxially sealed and slidingly arranged on the outer walls of the upper and lower valve seats, The outer layer positioning sleeve 31 is horizontally sealed with a partition plate 32, and the outer layer positioning ...
Example Embodiment
[0034] Example two
[0035] The structure and working principle of this embodiment and the first embodiment are basically the same, and the difference lies in Figure 7 As shown, the upper end of the double floating valve 100 in this embodiment is connected to a first double wall drill rod 6, and the lower end of the double floating valve 100 is connected to a second double wall drill rod 8.
[0036] Such as Figure 7 As shown, the upper outer wall of the valve sleeve 5 and the inner wall of the outer tube 61 of the first double-wall drill rod 6 are threadedly connected, and the lower end inner wall of the valve sleeve 5 is threadedly connected to the outer wall of the outer tube 81 of the second double-wall drill rod 8 , The top end of the upper valve seat 1 is sealed and inserted into the inner tube 62 of the first double-wall drill rod, and the first axial through hole 11 is in communication with the inner tube 62 of the first double-wall drill rod. The bottom end of the lower...
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