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 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780)
11/1998
11/26/1998DE19721383A1 Drilling tool blockage prevention system
11/25/1998CN2298342Y Oil-well work sand washing device
11/24/1998US5839522 Slurry diverter
11/24/1998US5839521 Oil and gas well cuttings disposal system
11/24/1998US5839520 Method of decreasing the tortuosity of a high deviated well bore
11/19/1998WO1998051900A1 Arrangement in a drilling apparatus
11/19/1998DE19720565A1 Catcher for dust made by drill
11/18/1998CN2297533Y Down open type oil pipe flushing valve
11/18/1998CN1199255A Female wet connector
11/18/1998CN1199254A Male pin connector
11/18/1998CN1199130A Logging tool deployment apparatus and method
11/17/1998US5836395 Valve for wellbore use
11/17/1998CA2107425C Kci drilling mud treatment for disposal system
11/17/1998CA2067215C Drill cuttings disposal method and system
11/12/1998WO1998050672A1 Improved method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing
11/11/1998CN1198502A Boring device and torque support for boring device
11/04/1998EP0875659A2 Valve for use in a subterranean well
11/03/1998US5829526 Method and apparatus for placing and cementing casing in horizontal wells
11/01/1998CA2236457A1 Pressure activated switch valve
10/1998
10/29/1998WO1998048143A1 Downhole surge pressure reduction system and method of use
10/29/1998DE19817000A1 Underground pipeline with external lubricant feed to reduce friction with ground
10/27/1998US5826669 Adding resilent graphitic carbon particles larger than +200 mesh; plugs subterranean formations; wear resistance, friction resistance, nontoxic, noncaking
10/27/1998US5826658 Riser fill-up valve
10/22/1998WO1998035767A3 Apparatus for recovering hydrocarbons from solids
10/20/1998US5823275 High-speed drill for rock stake engineering
10/20/1998US5823274 Drill rod
10/14/1998EP0870901A2 Downhole tool
10/10/1998CA2201028A1 Rough neck jacket
10/07/1998EP0868594A1 Water separator for a down hole drill
10/01/1998WO1998042948A1 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production
10/01/1998WO1998026151A3 Method and device for driving bore holes, specially exploring and extraction drillings in the sea bottom
09/1998
09/30/1998EP0866842A1 Drilling fluid loss prevention and lubrication additive
09/29/1998US5814230 Apparatus and method for separation of solids from liquid
09/29/1998US5813483 Safety device for use on drilling rigs and process of running large diameter pipe into a well
09/29/1998US5813457 Wellbore cementing system
09/23/1998EP0865564A1 Down hole bypass valve
09/23/1998EP0678149B1 Method for reinforcing a masonry wall
09/23/1998EP0676002B1 Anti-rotation devices for use with well tools
09/20/1998CA2200524A1 Separator for removing solids from drilling fluid
09/15/1998US5807095 For separating combustible gas from fluid produced during drilling
09/15/1998US5806611 For drilling a borehole in an earth formation
09/15/1998US5806596 One-trip whipstock setting and squeezing method
09/15/1998US5806589 Apparatus for stabbing and threading a drill pipe safety valve
09/15/1998CA2155588C Method and apparatus for the injection disposal of solid and liquid waste materials from the drilling and production of oil and gas wells
09/09/1998CN1192502A Down hole mud circulation system
09/08/1998US5803195 System, method and cutterhead for dry full-area drilling
09/08/1998US5803191 Well entry tool
09/08/1998US5803186 Formation isolation and testing apparatus and method
09/08/1998US5803185 Steerable rotary drilling systems and method of operating such systems
09/03/1998WO1998038411A2 Apparatus for use in drilling operations
09/03/1998WO1998038410A1 Downhole clutch with flow ports
09/03/1998CA2230364A1 Balanced or underbalanced drilling method and apparatus
09/02/1998EP0861309A1 Method for extracting oil from oil-contaminated soil
09/01/1998US5799742 Core drilling latch assembly
09/01/1998US5799740 Directional boring head with blade assembly
09/01/1998US5799733 Method of servicing a well
08/1998
08/27/1998WO1998037300A1 Bottomhole assembly and methods of use
08/27/1998WO1998022689A3 Whipstock
08/27/1998CA2578726A1 Bottom hole assembly and methods of use
08/26/1998EP0860907A2 Female wet connector
08/26/1998EP0860902A2 Male pin connector
08/26/1998EP0860584A2 Pump-down tool apparatus
08/26/1998EP0860583A2 Down hole mud circulation system
08/26/1998EP0859901A1 Spear head assembly
08/25/1998US5798488 Drilling apparatus
08/25/1998US5797454 Method and apparatus for downhole fluid blast cleaning of oil well casing
08/20/1998WO1998036151A1 Aphron-containing well drilling and servicing fluids
08/20/1998WO1998035914A1 Process for cleaning fluids with particulate solids
08/20/1998WO1998035767A2 Apparatus for recovering hydrocarbons from solids
08/19/1998CN2288262Y Ball valve device convenient to fish up and fix valve ball
08/18/1998US5794722 Gumbo removal
08/18/1998CA2027211C Casing circulator and method
08/06/1998WO1998034007A1 Tool and method for drilling a lateral well
08/04/1998US5788781 Contacting with mixture of surfactants having specified hydrophilic-lipophilic balance in nonpolar diluent oil, rinsing with water
08/04/1998US5787999 For attachment to a down hole pneumatic hammer
08/04/1998US5787979 Plug system for wellbore operations
08/04/1998US5787978 Multi-face whipstock with sacrificial face element
07/1998
07/30/1998WO1998032945A1 Reverse circulation drilling system with bit locked underreamer arms
07/30/1998CA2279224A1 Reverse circulation drilling system with bit locked underreamer arms
07/29/1998EP0855490A2 Drilling apparatus and downhole torque generator
07/29/1998EP0854897A1 Improved oil-based drilling fluid
07/28/1998US5785131 Pressurized formation sample collection
07/23/1998DE19702053A1 Drilling machine for opening holes in plaster layer of wall
07/21/1998US5782305 Method and apparatus for removing fluid from production tubing into the well
07/14/1998US5780407 Includes a surfactant and a diluent oil; useful in cleaning oil-contaminated substrates
07/14/1998US5778976 Casing installation equipment
07/07/1998US5775443 For drilling a well bore hole in a formation
07/07/1998US5775442 Recovery of gas from drilling fluid returns in underbalanced drilling
07/02/1998WO1998028517A1 Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus
07/02/1998WO1998028044A1 Method for oxidising pre-treatment of drillings contaminated by olefin based sludge
07/02/1998DE19700974A1 Adaptor to fill hollow spaces for ditchless laying of pipe conduits in ground
07/02/1998CA2274169A1 Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus
06/1998
06/25/1998WO1998005848A3 Method and apparatus for the downhole metering and control of fluids produced from wells
06/24/1998CN1185582A 井下电磁流量计 Downhole electromagnetic flowmeter
06/24/1998CN1038867C Temp. Controlled split-flow device valve
06/23/1998CA2015298C Dust seal for gyratory crushers
06/20/1998CA2218205A1 Well drilling and servicing fluids and methods of reducing fluid loss and polymer concentration thereof
06/18/1998WO1998026151A2 Method and device for driving bore holes, specially exploring and extraction drillings in the sea bottom
06/17/1998EP0847477A1 Drill bit with set of underreamer arms
06/17/1998CN2284295Y Water meter for well-cleaning of oil field water filling well
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