135271 ⎘
Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
Drilling device
#2WELL DRILLING SYSTEM
#3One trip multiple string section milling of subterranean tubulars
#4Apparatus and method for modifying the sidewalls of a borehole
#5Collapsible rock head and associated structure
#6Drill bit and method for inserting, expanding, collapsing, and retrieving drill bit
#7Retrieval tool with slips for retrieving bottom hole assembly during casing while drilling operations
#8Controlling backflow pressure during retrieval of bottom hole assembly
#9Drilling device for drilling and reaming of a hole
#10Drilling apparatus having in-line extending wings and driving method thereof
#11Liner drilling system and method of liner drilling with retrievable bottom hole assembly
#12Method for drilling with casing
#13Device for a drilling tool
#14Method for drilling with a wellbore liner
#15Method for drilling with casing
#16Method and apparatus for conducting earth borehole operations using coiled casing
#17Expandable bit
#18Directional casing and liner drilling with mud motor