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Match Document Document Title
8297365 Drilling string back off sub apparatus and method for making and using same  
A back-off sub apparatus is disclosed. The apparatus includes a connection connecting a rotational section and a non-rotational section. The rotational section is designed to be rotated via a ball...
7665545 Pressure controlled downhole operations  
A method and apparatus for temporarily increasing fluid pressure at a specific location in a work string to perform an operation in an oil or gas well bore. Apparatus is provided which, in a first...
7347289 Dart-operated big bore by-pass valve  
A by-pass tool is provided which has a large bore throughflow passage when in an inactive drilling mode, and which is capable of being activated upon launching of an activation dart from the...
6820697 Downhole bypass valve  
A fluid flow actuated downhole tool is configurable in at least a first tool configuration and a second tool configuration. The tool comprises a tubular housing and an activating sleeve, the...
6315053 Method of use and apparatus for a hydraulic tensioning device for inflatable packer element  
A hydraulic technique for applications with inflatable packers keeps the inflatable packer in a stretched-out condition despite the forces imposed on the packer by circulating fluids. This...
6253861 Circulation tool  
A tool or sub for use in a well bore is adapted to manipulate the circulation path of fluid through a drill string or work string in which the tool is connected. The apparatus has a body member...
4877095 Stopper for cable passages or conduits  
Stopper, for cable passages or conduits, having a first chamber placed in said passage, said chamber comprising at least one bearing surface placed in this passage and adapted to cooperate with a...
4645006 Annulus access valve system  
An annulus access valve system having a plurality of valves installed in, and forming a part of, a drill string in a well bore whereby fluid may be pumped into the annulus through the valves...
4452322 Drilling device for drilling a core in deep drill holes  
In a core drilling apparatus wherein a core bit is driven by a hydraulically actuated Moineau type motor, control valve means are provided whereby drilling fluid can be directed through the core...
4401171 Underreamer with debris flushing flow path  
An underreamer having a plurality of drilling arms hingedly attached to a tubular body for movement between a retracted position and an extended position for drilling. The underreamer includes a...
4378050 Arrangement for full hole drilling  
An arrangement for full hole drilling, wherein a drilling bit having a passage for drilling fluid is attached to a drill pipe string. A hole wall former is provided above the bit for closing the...
4296822 Multipurpose fluid flow assisted downhole tool  
A multipurpose fluid flow assisted downhole tool that is adapted for attachment to the lower end of a pipe string to be extended into a well bore and which is capable of cutting sample cores from...
4241797 Impact tool for dislodging stuck drill bits  
An improved impact tool being attached to a drill stem about ten (10) or more feet above the drill bit, and in drilling mud flows through the impact tool to the drill bit when the well is being...
4230192 Core sampling apparatus and method  
Coring apparatus for obtaining core samples which may comprise: an outer barrel assembly, the lower end of which is adapted for connection to a core bit, the upper end of which is adapted for...
4114703 Well drilling tool having sealed lubrication system  
A turbo drill which is connected to a string of drill pipe as a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has...
4114702 Well drilling tool with lubricant level indicator  
A turbo drill which is connected to a string of drill pipe as a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has...
4114704 Down hole well drilling tool with reversible thrust bearings  
A turbo drill which is connected to a string of drill pipe as a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has...
4059155 Junk basket and method of removing foreign material from a well  
An improved junk basket comprises a tool body having a longitudinally extending passageway therethrough and a magnet assembly disposed in the passageway. A retainer is cooperative between the...
4058163 Selectively actuated vibrating apparatus connected with well bore member  
A vibrating apparatus connected with a member insertable into a well bore including an insertable and retrievable member enabling the vibrating apparatus to be selectively actuated. The vibrating...
3915245 Test boring drill bit  
An apparatus for carrying out a test boring wherein the drilling and sampling operations are carried out in one operation is described. A drilling bit is detachably secured to a modified...
3867985 Apparatus for and method of preventing blow-out while removing a fish within wash pipe from a borehole  
A tubular sleeve, having concentric walls at one end adapted to be connected with concentric pipe joints in a well bore, is provided with ports communicating with a ball valve containing chamber,...
3804182 METHOD OF PLACING EXPLOSIVE CHARGES  
Seismic energy for geophysical prospecting is provided by drilling a shot-hole to a selected depth using a cutting tool such as a hydraulic jet nozzle or a downhole drill motor attached to a...
3795282 WELL FLUSHING METHOD  
Method of flushing debris from a well wherein an upper section of the well hole has a significantly larger diameter than the lower end. Drilling fluid is normally supplied through a drilling bit,...
3645346 EROSION DRILLING  
An erosion bit for earth-drilling operations having a first nozzle system open for conducting drilling fluid and a second nozzle system closed by a pressure-sensitive closure means. Means are...
3645331 METHOD FOR SEALING NOZZLES IN A DRILL BIT  
A method for selectively sealing nozzles in an erosion bit without removing the bit from the well comprising the steps of (a) plugging the nozzles centrally located in the bit with sealants...
3608654 ROCK DRILL BIT  
A rock drill bit having helical side cutting edges and radial bottom cutting edges, and having an inside cavity for receiving cooling mud, with diametrically opposite downwardly and outwardly...
3429387 PUMP OUT DRILL BIT  
3370887 Hole preparation for fracturing solution mining wells  
3361220 Jarring or drilling mechanism  
3308895 Core barrel drill  
3223184 Bore hole logging apparatus  
3195660 Drilling bit  
3172486 Explosive-actuated apparatus for taking cores  
3166132 Grouting tool  
3163241 Core sample taking  
3134441 Apparatus for drill stem testing  
3120872 Junk retriever  
3116800 Apparatus for conditioning well bores  
3066735 Hydraulic jetting tool  
3020964 Device for introducing fluid in wells  
3012622 Core barrel apparatus  
2978032 Whip stock locking and releasing apparatus  
2915284 Reservoir coring  
2915127 Fluid controlled junk basket  
2893691 Core drilling  
2890756 Hydraulic type junk basket for wells  
2882020 Self-cleaning reamer  
2882019 Self-cleaning collapsible reamer  
2880965 Means and method of drilling with aerated drilling liquids  
2834578 Reamer  

Matches 1 - 50 out of 54 1 2 >