| Patents for E21B 7 - Special methods or apparatus for drilling (22,064) |
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| 03/26/1991 | US5002138 Steerable drilling mole |
| 03/26/1991 | US5002137 Moling system |
| 03/26/1991 | CA1281996C Forming a coating on a borehole wall |
| 03/21/1991 | WO1991003686A1 Method of studying pressure combustion processes of stoichiometrically burning hydrogen/oxygen under high pressures |
| 03/20/1991 | EP0417291A1 Device for making holes in the ground |
| 03/20/1991 | CN1050075A Well reamer |
| 03/20/1991 | CN1012089B Cutter assembly for rotary boring of earth |
| 03/19/1991 | US5000426 Exothermic cutting torch |
| 03/19/1991 | US5000272 Self-controlling drill rod |
| 03/19/1991 | US5000051 Lysimeter probe which may be inserted into the ground |
| 03/14/1991 | DE3930231A1 Verfahren zur direkten beobachtung von druckverbrennungsvorgaengen in der tiefsee zur brennstrahl-simulation von stoechiometrisch verbrennendem wasserstoff/sauerstoff in unter hohem druck stehender gesteinsschmelze Method for the direct observation of druckverbrennungsvorgaengen in the deep sea for burning jet simulation of stoichiometric hydrogen-burning / oxygen under high pressure into rock melt |
| 03/13/1991 | EP0417055A1 Device for positioning of a drill bit |
| 03/13/1991 | CN1011992B Radiation well series-bead cave well method |
| 03/07/1991 | WO1991003673A1 Method for trenchless replacement of a pipeline |
| 03/07/1991 | WO1991002881A1 Device for deep ground consolidation |
| 03/07/1991 | WO1991002880A1 Drill |
| 03/07/1991 | DE3929017A1 Machine for placing pipe in trench - consists of cutter rim, pulley, screw conveyor and motor |
| 03/07/1991 | DE3928619A1 Directional drilling rig has drill rod inside drill pipe - with drill bit at angle to drill pipe axis and driven independently or simultaneously with drill pipe |
| 03/07/1991 | CA2040424A1 Method for trenchless replacement of pipeline |
| 03/06/1991 | EP0414891A1 Method and device for trench-free laying of pipelines |
| 03/06/1991 | EP0362292B1 Device to cut, drill or similarly machine rock, ore, concrete or similar |
| 03/06/1991 | CN1011900B Radition well siphonate type series accomplishing well technology |
| 03/05/1991 | US4997047 High speed electromagnetically accelerated earth drill |
| 03/05/1991 | US4996887 Device for taking samples of bottom sediments and bottom water from water basins |
| 03/05/1991 | CA1281025C Mechanical directional drilling jar |
| 03/01/1991 | WO1991003620A1 Well casing flotation device and method |
| 03/01/1991 | CA2065338A1 Well casing flotation device and method |
| 02/28/1991 | DE3927952A1 Drilling for blasting - uses cradle and washing nozzle together with carriage mounted drive and hydraulic hammer |
| 02/26/1991 | US4995466 Method and device for stabilizing the path of a drilling tool |
| 02/26/1991 | US4995465 Rotary drillstring guidance by feedrate oscillation |
| 02/26/1991 | CA1280688C Well completion process using a polymer gel |
| 02/19/1991 | US4993504 Device for efficient energy transfer and damping of impact drilling machines |
| 02/19/1991 | US4993503 Horizontal boring apparatus and method |
| 02/19/1991 | US4993500 Automatic drive hammer system and method for use thereof |
| 02/19/1991 | CA1280362C Whipstock packer assembly |
| 02/13/1991 | EP0412174A1 Production of bore holes in a given direction |
| 02/13/1991 | EP0412092A1 Method and apparatus for the production of underground pipelines. |
| 02/12/1991 | US4991669 Device for controlling the passage of a flushing medium in impact machines |
| 02/12/1991 | US4991668 Controlled directional drilling system and method |
| 02/12/1991 | US4991667 Hydraulic drilling apparatus and method |
| 02/06/1991 | EP0411278A1 Method and apparatus for destroying an underground pipe |
| 02/06/1991 | CN1049045A Shield type tunnel machine |
| 02/05/1991 | US4990028 Anti-friction composition containing MgO and method |
| 02/05/1991 | CA1279865C Percussive tool with high pressure fluid jet |
| 01/31/1991 | DE3923707A1 Machine for replacing underground pipes - consists of pipe thrust drive with starting and finishing pits |
| 01/30/1991 | EP0410729A1 Flexible centralizer |
| 01/30/1991 | EP0410353A1 Shield tunnelling machine |
| 01/29/1991 | US4987961 Drill stem arrangement and method |
| 01/24/1991 | DE4008571A1 Method of winning ground heat - involves drilling without rotation and using natural pressure and temperature ratios with electro hydraulic effects |
| 01/22/1991 | US4986373 Post hole digger |
| 01/22/1991 | US4986361 Well casing flotation device and method |
| 01/22/1991 | US4986203 Method for raising any object lying on the bottom of the sea, a river or basin, and apparatus used thereby |
| 01/15/1991 | US4985610 Cutting torch |
| 01/15/1991 | US4984936 Stopper apparatus for rotary reaction force |
| 01/12/1991 | CA2020781A1 Steerable earth boring device |
| 01/10/1991 | DE3920392A1 Verfahren zum abbau und zur foerderung einer unter wasser lagernden bodenschicht und vorrichtung zur durchfuehrung des verfahrens A method for degrading and foerderung a ground layer overlying underwater and apparatus for performing the method |
| 01/09/1991 | EP0406492A1 Method and apparatus for directional drilling using sonic energy |
| 01/08/1991 | US4984289 Apparatus for controlling underground excavator |
| 01/08/1991 | US4983074 Offshore support structure method and apparatus |
| 01/08/1991 | US4983071 Pipe bursting and replacement apparatus and method |
| 01/08/1991 | US4982802 Method for stabilizing a rotary drill string and drill bit |
| 01/07/1991 | WO1991000941A1 Method and tool for producing a pile |
| 01/07/1991 | CA2063573A1 Pile moulding process and tooling assembly for implementing the same |
| 01/02/1991 | CN1048258A Pipe burster |
| 01/02/1991 | CA1278509C Hydraulic well penetration apparatus and method |
| 01/01/1991 | US4981181 Ram boring machine for laying service lines without excavation |
| 12/30/1990 | WO1991000411A1 Drill string component |
| 12/30/1990 | CA2058956A1 Drill string component |
| 12/28/1990 | CA2018410A1 Down-hole bent motor housings |
| 12/27/1990 | WO1991000410A1 Device for guiding a drilling tool into a well and for exerting thereon a hydraulic force |
| 12/27/1990 | EP0404256A1 Procedure for the widening of a passage in the ground |
| 12/25/1990 | US4979577 Flow pulsing apparatus and method for down-hole drilling equipment |
| 12/25/1990 | US4979575 Method of drilling a hole-in a rock |
| 12/20/1990 | DE3940354A1 Underground pipe removal method - involves cutting through in lengthwise direction and forming space between it and earth |
| 12/20/1990 | DE3940321A1 Replacement of underground metal pipes - is achieved by cutting old pipe into two halves, forcing halves apart and inserting new pipe |
| 12/20/1990 | DE3919894A1 Rotary boring device for concentric enlargement of boreholes - used for bored piles, in loose or cohesive soils |
| 12/20/1990 | DE3919824A1 Mobile rotary boring and borehole lining arrangement - for installing concrete piles, is adapted from excavator or crane and safely distributes torque reaction forces |
| 12/19/1990 | EP0403078A2 Method and apparatus for directional drilling |
| 12/18/1990 | US4977967 Steering and lubricating apparatus for portable earth boring machine with steering head |
| 12/18/1990 | CA1277975C Process to sink an in-ground pile, as well as boring machine and device used in said process |
| 12/14/1990 | CA2006275A1 Method and apparatus for subsoil drilling |
| 12/13/1990 | WO1990015221A1 Moling system |
| 12/13/1990 | WO1990015197A1 Device for laying horizontal pipes in the ground |
| 12/13/1990 | DE3918799A1 Core drilling in rock and ice - uses hydraulic breaker flat jacks as side cutters to enlarge boreholes and to remove debris |
| 12/12/1990 | EP0402337A2 Drill tool |
| 12/12/1990 | EP0402167A1 Pipe burster |
| 12/11/1990 | US4976322 Method of construction of multiple-string wells |
| 12/09/1990 | CA2018445A1 Drill tool |
| 12/06/1990 | DE3917688A1 Drainage pipe advance system for dug wells - uses drilling rods, with drilling head and retainer jaws for pipe |
| 12/05/1990 | EP0401191A1 Steerable drilling mole |
| 12/05/1990 | CN2066886U Guide for drilling |
| 12/05/1990 | CN1047550A Rock drilling method and apparatus |
| 12/04/1990 | US4974688 Steerable earth boring device |
| 12/04/1990 | US4974687 For driving holes in the ground |
| 12/04/1990 | US4974672 Gravel packing system for a production radial tube |
| 11/29/1990 | DE4010955A1 Combined pile driver and drilling rig - has two telescopic parts actuated by hydraulic cylinder and elastomeric spring |
| 11/28/1990 | EP0269638B1 A method and a device for deep hole drilling |
| 11/28/1990 | CN2066481U Spiral rod drilling tool |
| 11/27/1990 | US4972907 Method of conducting well operations from a moveable floating platform |
| 11/27/1990 | US4972703 Method of predicting the torque and drag in directional wells |