Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 7 - Special methods or apparatus for drilling
Patents for E21B 7 - Special methods or apparatus for drilling (22,064)
05/1998
05/26/1998US5755285 Method for decontaminating soil containing harmful substances and boring head for carrying out the method
05/26/1998CA2221435A1 One-trip whipstock setting and squeezing method
05/26/1998CA2135402C Guide assembly and method
05/22/1998WO1998021439A1 Process and device for simultaneously drilling and lining a hole
05/20/1998EP0842345A1 Drilling method and casing shoe
05/20/1998DE19708536C1 Screw conveyor
05/20/1998CN1182165A Method and apparatus for establishing branch wells at node of parent well
05/19/1998US5752572 Tractor for remote movement and pressurization of a rock drill
05/18/1998CA2220779A1 Retrievable whipstock
05/14/1998WO1998020229A1 Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment
05/14/1998CA2270959A1 Method and apparatus for attaching a casing to a drill bit in overburden drilling equipment
05/13/1998EP0841462A2 Downhole tool with at least one formation-engaging member
05/13/1998EP0840834A1 Apparatus and process for drilling and completing multiple wells
05/12/1998USRE35790 System for drilling deviated boreholes
05/12/1998US5749678 Device for driving a tunnel or drain pipe
05/07/1998WO1998019091A1 Hose supporting arrangement for actuators of rock drill apparatus
05/07/1998DE19646341C1 Device for laying pipes below ground
05/06/1998EP0839297A1 Method for replacing buried pipe
05/06/1998EP0839254A1 Branch boreholes
05/05/1998US5746279 Method and apparatus for changing bits while drilling with a flexible shaft
05/05/1998US5746278 Apparatus and method for controlling an underground boring machine
05/05/1998US5746277 Drilling apparatus
04/1998
04/29/1998EP0837978A1 Single trip whipstock assembly
04/29/1998CN1180131A Omnibearing hydraulic jumbolter
04/29/1998CN1180129A Drill means
04/23/1998WO1998016714A1 Soil auger and mechanical soil sampler
04/23/1998WO1998016713A1 Excavation method using electric pulses, and excavator
04/22/1998EP0836668A1 Multi-activity offshore exploration and/or development drilling method and apparatus
04/22/1998EP0836667A1 Locating a discrete in-ground boring device
04/22/1998CN2279436Y Anchor bolt enlarging wall drilling tool
04/21/1998US5741967 Method for determining optimum horizontal drilling direction and drilling horizon
04/21/1998US5740864 Method of placement of a whipstock in a wellbore
04/21/1998US5740860 Side pocket mandrel for a measuring instrument
04/21/1998CA2143793C Surface adjustable bent housing
04/16/1998WO1998015713A1 Hydrostatic penetration device and tool for the same
04/16/1998WO1998015710A1 Reaming apparatus with enhanced stability and transition from pilot hole to enlarged bore diameter
04/16/1998DE19644349C1 Rock drill cylindrical cover
04/16/1998CA2272860A1 Hydrostatic penetration device and tool for the same
04/15/1998CN2278757Y Flexible pipe drilling tool for super-short radium horizontal drilling
04/14/1998US5738178 Method and apparatus for navigational drilling with a downhole motor employing independent drill string and bottomhole assembly rotary orientation and rotation
04/09/1998WO1998014687A1 Novel method of drilling well bores
04/08/1998EP0834643A2 Method and apparatus for drilling and re-entering multiple lateral branches in a well
04/07/1998US5735636 Method for installing an expansion joint in a concrete dam
04/07/1998US5735357 Apparatus for and method of directional drilling
04/07/1998US5735356 Method of removing soil from a well
04/07/1998US5735355 For heating a surrounding geological structure to a molten state
04/07/1998US5735350 Methods and systems for subterranean multilateral well drilling and completion
04/02/1998WO1998013575A1 Bit assembly
04/02/1998WO1998013572A1 Combination milling tool and drill bit
04/02/1998WO1998013555A1 A method in piling tubular bases, a combined drilling and piling rig, as well as use of the drill hammer of said rig
04/02/1998CA2266550A1 A method in piling tubular bases, a combined drilling and piling rig, as well as use of the drill hammer of said rig
04/01/1998EP0832344A2 Down hole hammer assembly
03/1998
03/25/1998CN1177038A Stone breaking operating apparatus of construction machinery
03/24/1998US5730358 To optimize performance of a selected task
03/24/1998US5730221 Methods of completing a subterranean well
03/24/1998CA2135975C Rock boring process and apparatus
03/19/1998WO1998011323A1 Tunnel boring machine
03/19/1998WO1998011321A1 Method and apparatus for driving an article into a medium
03/18/1998EP0829614A1 Drilling apparatus and drilling method
03/18/1998EP0828914A1 Adjustable stabilizer for directional drilling
03/17/1998US5727641 Articulated directional drilling motor assembly
03/17/1998US5727629 Wellbore milling guide and method
03/13/1998CA2214175A1 Drilling apparatus and drilling method for renovating underground pipes
03/11/1998EP0828108A1 Process for connecting conduits
03/10/1998US5725060 Mill starting device and method
03/10/1998US5725059 Method and apparatus for producing parallel boreholes
03/09/1998CA2214551A1 A drilling hole system
03/05/1998WO1998009049A1 Method and apparatus to seal a junction between a lateral and a main wellbore
03/05/1998WO1998009047A1 Coiled tubing entry guide
03/05/1998CA2233216A1 Coiled tubing entry guide
03/03/1998US5722498 Soil displacement auger head for installing piles in the soil
02/1998
02/26/1998WO1998007960A1 Underground augering machine by electrical crushing, excavator, and its excavating method
02/26/1998WO1998007952A1 Rock drilling rig
02/25/1998EP0825326A2 Method and apparatus for horizontal drilling and for handling drill rods
02/25/1998EP0824634A1 A hydraulic arrangement for turning the actuator of a rock drilling machine
02/25/1998EP0824625A1 Method and apparatus for blasting hard rock
02/25/1998CN1174587A Method and apparatus for drilling with high-pressure, reduced solid content liquid
02/24/1998US5720356 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well
02/24/1998US5720354 Trenchless underground boring system with boring tool location
02/24/1998US5720349 For wellbore milling operations
02/24/1998CA2133677C Coupling for rotary-vibratory drills
02/22/1998CA2213536A1 Intermediate radius steerable tool
02/19/1998DE19729059A1 Sealing arrangement for boreholes in rock formations with pressure burden
02/18/1998CN2274684Y Dual acting drilling apparatus
02/12/1998DE19626589C1 Sinking boreholes in soft ground
02/12/1998DE19623922C1 Device for drawing pipe into ground using plough-type unit
02/11/1998EP0823534A1 Apparatus for establishing branch wells from a parent well
02/11/1998CN1173039A Wafer carrier
02/10/1998US5715896 Method and composition for reducing torque in downhole drilling
02/10/1998US5715891 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access
02/10/1998CA2183033A1 Orienting tool for coiled tubing drilling
02/10/1998CA2054488C Reversible impact-operated boring tool
02/05/1998WO1998004804A1 Apparatus and method for milling a hole in casing
02/03/1998CA2099981C Drilling unit
01/1998
01/29/1998WO1998003764A1 Underground warning system for underground conduits or pipes
01/29/1998WO1997041330A3 Multi-lateral wellbore system and method for forming same
01/28/1998EP0820421A2 Displaceable working apparatus with extensible boom
01/27/1998US5711385 Augerless boring system
01/27/1998CA2110060C Method and apparatus for determining path orientation of a passageway
01/21/1998EP0819829A2 Apparatus for completing a subterranean well and method of using same
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