A New Reaming Tool While Drilling

Abstract

The invention relates to a novel reaming-while-drilling tool for the technical field of oil and gas field reaming-while-drilling. According to the technical scheme, the lower end of an upper joint isin threaded connection with the upper end of an upper shell, a thrust bearing is disposed on the upper surface of a bearing support, a helical rotation shaft is disposed within the upper shell, a spiral wing is disposed on the outer surface of the middle of the helical rotation shaft, the lower end of the upper shell is in threaded connection with the upper end of a lower shell, and the lower endof the lower shell is in threaded connection with a drill bit. The lower end of the helical rotation shaft is in threaded connection with the upper end of a gear shaft. The lower end of the gear shaftis inserted into an inner cavity of the drill bit, a sealing device is arranged between the lower end of the gear shaft and the inner cavity of the drill bit, the upper portion and the lower portionof the gear shaft are respectively provided with two involute gears, a knife edge is fixed to the outer side of a through groove in a righting rib of the lower shell through a pin shaft, and a rotaryshaft of a rotary supporting body is installed in sliding grooves in the two ends of the inner side of the through groove in the righting rib of the lower shell. According to the tool, it is effectively guaranteed that the diameter of a wellbore is not reduced, the service life of a reamer, especially the reaming knife edge, is prolonged, the diameter of the wellbore is expanded to be larger, andthe secondary reaming function is realized.

Description

technical field [0001] The invention relates to the field of oil and gas field drilling operations, in particular to a reaming-while-drilling tool used in the technical field of reaming-while-drilling. Background technique [0002] Reaming-while-drilling technology is a new drilling technology with development potential. The so-called reaming-while-drilling technology is a drilling technology that uses reaming-while-drilling tools in conjunction with conventional drill bits (PDC bits or roller cone bits) to expand the diameter of the wellbore while fully drilling. The reaming-while-drilling technology is beneficial to the cementing of slim hole intervals in deep / ultra-deep wells, can increase the size of production casing, and is also conducive to well completion and workover operations. The reaming tools developed and used at home and abroad mainly include double-center reaming drills and hydraulic telescopic reaming tools; the former uses the eccentric block on the outsid...

AI Technical Summary

Problems solved by technology

The reaming tools developed and used at home and abroad mainly include double-center reaming drills and hydraulic telescopic reaming tools; the former uses the eccentric block on the outside of the double-center reaming drill to expand the diameter under the revolution of the drill, and is reliable in work but expands. The diameter is limited by the inner diameter of the casing in the upper well section

The latter is to use the stretchable blade to realize the diameter expansion. The inner diameter of the casing in the upper well section has less restrictions on the diameter expansion, and the expansion with a large displacement can be realized. The expansion and contraction method determines the reliability of the diameter expansion. Now Some telescopic reaming tools almost rely on springs and hydraulic methods to realize the expansion and contraction of the blade; at the same time, affected by the hardness of the well wall rock, the blade of the reaming tool wears faster than the drill bit, so the reaming tool while drilling It does not match the working life of the drill bit. When the reaming blade is worn out, it must be tripped out to replace a new reaming blade, which increases the number of trips and increases the drilling cost.

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