Backward-flowing prevention air hammer drill for foam drilling
An anti-backflow and air hammer technology, applied in the field of oil and gas well drilling, can solve problems such as non-working, affecting normal drilling, and air hammer stuck, and achieve the effect of reducing drilling costs and reducing the number of trips.
Inactive Publication Date: 2012-08-01
PETROCHINA CO LTD
5 Cites 6 Cited by
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Abstract
The invention provides a backward-flowing prevention air hammer drill for foam drilling. The backward-flowing prevention air hammer drill is characterized by comprising a tapered check valve, wherein the tapered check valve is arranged on the upper part of a center hole of the backward-flowing prevention air hammer drill and at the lower end of a tail pipe of the drill, and comprises a valve element body and a valve plug; the valve element body comprises a valve element and a pipe plug; the valve plug is in interference fit with the center hole of the backward-flowing prevention air hammer drill; the valve element is in clearance fit with the center hole of the drill; the valve element and the pipe plug form the valve element body with a hollow inner part; the valve element body can float up and down along a vertical direction between an upper dead center and a lower dead center; the upper dead center is the highest point for the upward floating of the valve element body along the vertical direction; and the lower dead center is the lowest point for the downward floating of the valve element body along the vertical direction.
Application Domain
Earth drilling toolsDrill bits
Technology Topic
EngineeringDrill bit +3
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Classification and recommendation of technical efficacy words
- Reduce the number of trips
- Lower Drilling Costs
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