Split-type major-diameter air reverse circulation down hole hammer bottom reaming drill bit

Abstract

The invention discloses a split-type major-diameter air reverse circulation down hole hammer bottom reaming drill bit. The split-type major-diameter air reverse circulation down hole hammer bottom reaming drill bit comprises a bottom reaming center drill bit body, a bottom reaming drill bit supplement core, a limiting ring, a spline shaft, a spline housing, a semi-ring clamping key, a guide flat key and a drill bit valve. The spline shaft is combined with the bottom reaming center drill bit body, the drill bit valve with hard alloy cylindrical teeth being inlaid and other parts for installation so that rock can be cut. The spline shaft and the spline housing are combined to form a circulation channel for air circulation media with grooves and holes inside the spline shaft and the spline housing. The bottom reaming drill bit body is fixedly installed below an air down hole hammer drill through the semi-ring clamping key to conduct impact rotation drilling. The drill bit valve is installed on the bottom reaming center drill bit body and can move along the T-shaped clamping key on the drill bit valve, and thus the drilling diameter of the drill bit can be changed. The split-type major-diameter air reverse circulation down hole hammer bottom reaming drill bit is assembled with a protection casing pipe and the air down hole hammer drill, and air reverse circulation down hole hammerbottom reaming pipe-following drilling can be carried out. Compared with a conventional casing pipe drilling technology, the split-type major-diameter air reverse circulation down hole hammer bottom reaming drill bit has the technical advantages that the combination structure of the drill is simple, maintenance is made convenient, energy consumption is low and service life is long.

Description

technical field [0001] The invention relates to a reaming drilling device in the fields of geological exploration, oil drilling, geotechnical engineering drilling and the like, in particular to a split-type large-diameter air reverse circulation down-the-hole hammer bottom reaming drill bit. Background technique [0002] Geological exploration, oil drilling, geotechnical engineering drilling and other industries are often carried out in complex formations. For many complex formations, especially when drilling in easily collapsed and easily lost formations, if no corresponding cementing Wall protection measures, buried drill and drill stuck accidents will often occur, and serious well accidents in drilling engineering may affect the success or failure of the entire project. For this reason, drilling engineering technicians often adopt the method of lowering casing after conventional drilling, applying casing drilling technology or applying follow-up drilling technology to mai...

AI Technical Summary

Problems solved by technology

Follow pipe drilling is only suitable for engineering fields such as geological exploration with shallow hole depth, water well drilling, tunnel pipe shed construction, etc., and its scope of application is relatively narrow

In addition, due to the complex structure of the eccentric drill bit and eccentric drilling tool with pipe reaming and many wearing parts, the implementation effect of this drilling technology is not very satisfactory compared with expectations

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