135149 ⎘
Special methods or apparatus for drilling Drilling with diversely driven shafts extending into the borehole
APPARATUS FOR CAPTURING AXIAL FORCE ON AN INNER DRIVE MEMBER
#2Apparatus for capturing axial force on an inner drive member
#3Apparatus for capturing axial force on an inner drive member
#4Construction method and device for execution of a cast in-situ pile with multiple diameters decreasing with depth
#5Modular drilling apparatus and ground treatment methods
#6Dual-member pipe assembly
#7Method to prevent dual rod drill string drag
#8Ground drilling device, system comprising the ground drilling device, method for producing a ground drilling device, and use of a ground drilling device
#9Rock drilling arrangement, rock drilling rig and drilling method
#10Dual-member pipe assembly
#11Rig control apparatus, system, and method for improved mud-pulse telemetry
#12Dual member pipe joint for a dual member drill string
#13Double head drilling device and method for producing a bore
#14UNDERGROUND BARRIER FOR DETECTING HOLLOWS AND A METHOD OF USE THEREOF
#15Dual torque transfer for top drive system
#16Modular assembly for handling excavating equipment for excavating machines, excavating machine, method for converting the excavating configuration of an excavating machine
#17Directional micro lateral drilling system
#18Tool face orientation system for drilling boreholes
#19Drilling apparatus for producing a cased bore and method for operating a drilling apparatus
#20Top surface drilling device and methods for drilling a core in a top surface
#21Dual-member pipe assembly
#22Apparatus for drilling deeper and wider well bore with casing
#23Downhole drilling assembly having a hydraulically actuated clutch and method for use of same
#24Dual pipe drilling head with improved bearing retention structure
#25Drive device and method for operating a drive device
#26Device and method usable in well drilling and other well operations
#27Systems and methods for directional drilling
#28Rotary impact drill and double-layer drilling rod mechanism
#29Method and system for installation of in-ground conduit
#30Dual pipe rod assembly section, horizontal drilling device and probe housing
#31Drilling apparatus including milling devices configured to rotate at different speeds
#32Multifunctional screw drill and reaming device
#33Data Transfer In A Two-Pipe Directional Drilling System
#34Apparatus for drilling faster, deeper and wider well bore
#35Method and apparatus for dual speed, dual torque drilling
#36Plug connection and pipe section for a drill pipe
#37HORIZONTAL DIRECTIONAL DRILLING SYSTEM
#38Apparatus and a method for constructing an underground curved multisectional wall and stratum
#39Drilling apparatus
#40Drilling assemblies including one of a counter rotating drill bit and a counter rotating reamer, methods of drilling, and methods of forming drilling assemblies
#41Dual string orbital drilling system
#42Slim-hole parasite string
#43Rotary drive assembly for a drill rod
#44Control systems and methods for active controlled bottomhole pressure systems
#45Control systems and methods for active controlled bottomhole pressure systems
#46Using a rotating inner member to drive a tool in a hollow outer member
#47Easy hold power auger