Patent
Fluid actuated down-hole drilling apparatus
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TLDR
In this paper, a hydraulic drilling motor is connected to a drilling string of drill pipe and a drill bit for drilling a bore hole in the earth, the motor having a hollow rotor connected to the hollow drive shaft for attachment to the drill bit, the rotor being rotatable in a stator or housing fixed to the drilling string, rotor passage being closed automatically by a valve when liquid or other fluid is pumped through the motor to produce rotor and shaft rotation.Abstract:
A hydraulic drilling motor connectable to a drilling string of drill pipe thereabove and a drill bit therebelow for drilling a bore hole in the earth, the motor having a hollow rotor connected to a hollow drive shaft for attachment to the drill bit, the rotor being rotatable in a stator or housing fixed to the drilling string, the rotor passage being closed automatically by a valve when liquid or other fluid is pumped through the motor to produce rotor and shaft rotation, the valve automatically opening in the absence of pumping fluid through the motor to permit fluid to drain from the drilling string during its elevation with the motor in the bore hole, or to automatically fill with fluid during its lowering with the motor in the bore hole. Drilling weight is transferred from the non-rotating drilling string and housing to the drive shaft through an oil filled bearing section, the oil in such section being maintained at a higher pressure than the pressure externally of the section to retain the oil or other lubricant in a clean state.read more
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Hydrodynamic bearings having beam mounted bearing pads and sealed bearing assemblies including the same.
TL;DR: In this article, a hydrodynamic thrust, journal or combined radial and thrust bearing is mounted within a sealed housing assembly, which can be used to replace rolling element bearings and can be designed for mounting to either the shaft or housing.
Patent
Packer weighted and pressure differential method and apparatus for Big Hole drilling
TL;DR: In this article, a large diameter packer and pressure differential drilling tool and a method of controlled pressure balanced drilling in big hole well bores and shafts, characterized by a large-diameter packer slideable engaged with the well bore over a drill bit and through which a dual drill pipe operates and isolates drilling fluid from a hydrostatic head of fluid standing in a well bore surrounding the drill pipe, is described.
Patent
Progressive cavity pumps using composite materials
Steven M. Wood,Brian E. Spencer +1 more
TL;DR: In this paper, the stator, rotor and/or flex shaft of a progressive cavity pump are made up of composite materials, e.g., fiberglass and resin, in a variety of combinations with and without bonded resilient elastomers.
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Moineau motor with conduits through the stator
TL;DR: In this article, a progressive cavity drilling motor is disclosed with a multiplicity of helically formed conduits positioned in a resilient stator, where the conduits are placed in parallel with each of the semi circular lobes thereby reducing the thickness of the elastomer in the lobe area.
Patent
Progressive cavity motors using composite materials
Steven M. Wood,Brian E. Spencer +1 more
TL;DR: The stator, rotor and/or flex shaft of a progressive cavity motor are made up of composite materials, e.g., fiberglass and resin, in a variety of combinations with and without bonded resilient elastomers as mentioned in this paper.
References
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Well drilling apparatus
TL;DR: In this paper, the authors describe a drilling apparatus in which the motive force for the drill bit comprises a fluid motor disposed relatively close to the drill bits, the fluid motor comprising a pair of helicaL gears fitted one within the other, the outer gear having internal helical threads and comprising the rotor to which the drill is connected, the inner gear having external threads and being fixed against rotation.
Patent
Thrust bearings for underground drilling engines
TL;DR: In this article, the lower thrust bearing in an underground drilling machine comprises an upper sealing joint below which means are provided for maintaining the oil pressure at a level which is at least equal to that of the surrounding pressure of the mud in the borehole.
Patent
Means to prevent inward leakage across seals in a well tool
TL;DR: In this paper, a means for preventing leakage of drilling fluid into a housing of a logging-while-drilling tool around seals in said housing is provided, where the tool has at least one oilfilled compartment in which a shaft is journaled.
Patent
Well drilling system
Gerber Wayne S,Hudson Thomas B +1 more
TL;DR: In this paper, a hydraulically operated well-drilling system is described. But the cutting bit or tool is operated by the operator, rather than by the tool itself.