| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
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| 06/08/1999 | US5909771 Wellbore valve |
| 06/03/1999 | WO1999027228A1 Tool cooling system |
| 06/03/1999 | WO1999027226A1 A valve, a float shoe and a float collar for use in the construction of oil and gas wells |
| 06/03/1999 | WO1999027192A1 Soil consolidation apparatus, tool and method |
| 06/03/1999 | WO1999014461A3 A plug for use in wellbore operations, an apparatus for receiving said plug, a plug landing system and a method for cementing tubulars in a wellbore |
| 06/03/1999 | CA2311362A1 A valve, a float shoe and a float collar for use in the construction of oil and gas wells |
| 06/02/1999 | CN2321938Y Continue sand-flushing device |
| 06/01/1999 | US5908040 Method of cleaning boats that have been contaminated with oil and gas well drilling fluids and hazardous waste |
| 05/25/1999 | US5906238 Downhole flow control devices |
| 05/19/1999 | EP0916805A2 Apparatus and method for stimulating a subterranean well |
| 05/19/1999 | EP0916015A2 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 05/18/1999 | US5905061 Protonated amine salt, oleaginous and non-oleaginous liquids; deprotonation to oil in water emulsion |
| 05/14/1999 | WO1999023348A1 Method and apparatus for moving a diverter housing |
| 05/14/1999 | WO1999023345A2 Mill for use in a wellbore and method of milling |
| 05/12/1999 | CN2318390Y Rotary valve body for petroleum drilling mud pump |
| 05/11/1999 | US5901797 Drilling apparatus with dynamic cuttings removal and cleaning |
| 05/11/1999 | US5901796 Circulating sub apparatus |
| 05/06/1999 | WO1999022114A1 Method and apparatus for shutting in a well while leaving drill stem in the borehole |
| 05/06/1999 | WO1999022113A1 Method and apparatus for the transport and storage of drill cuttings |
| 05/06/1999 | WO1999022112A1 Downhole cutting separator |
| 05/06/1999 | EP0912651A1 Clay-free biodegradable wellbore fluid and method for using said fluid |
| 05/04/1999 | US5900137 Apparatus and method for separating components in well fluids |
| 05/04/1999 | US5899270 Side intake valve assembly |
| 04/27/1999 | US5896883 Portable liquid mud plant |
| 04/22/1999 | WO1999019595A1 Method and system for drilling underbalanced radial wells utilizing a dual string technique in a live well |
| 04/21/1999 | EP0909362A1 Boring tool for reverse circulation |
| 04/15/1999 | WO1999018327A1 Riser tube for use in great sea depth and method for drilling at such depths |
| 04/15/1999 | WO1999000575A3 Drilling system with sensors for determining properties of drilling fluid downhole |
| 04/14/1999 | EP0908599A2 Bypass diverter box for drilling mud separation unit |
| 04/14/1999 | EP0907820A1 Drill tube for forming drill strings |
| 04/07/1999 | EP0907003A1 Flow divider box for conducting drilling mud to selected drilling mud separation units |
| 04/07/1999 | EP0906487A1 A system for directional control of drilling |
| 04/07/1999 | CN1213423A Device for drilling bore hole in the ground |
| 04/07/1999 | CN1042859C Apparatus for testing shear thickening plugging fluid |
| 04/06/1999 | US5890549 Well drilling system with closed circulation of gas drilling fluid and fire suppression apparatus |
| 04/06/1999 | US5890547 Pressure converter |
| 04/06/1999 | US5890542 Apparatus for early evaluation formation testing |
| 04/06/1999 | US5890540 Downhole tool |
| 04/06/1999 | US5890538 Reverse circulation float equipment tool and process |
| 04/01/1999 | WO1999015758A2 Subsea drill fluid pumping and treatment system for deepwater drilling |
| 03/31/1999 | EP0904481A1 Core machine |
| 03/31/1999 | EP0904479A1 Multi-cycle circulating sub |
| 03/31/1999 | EP0904162A1 Continuous belt drilling mud separation system |
| 03/31/1999 | CN1042740C Drilling mud containing water and their preparation method and use |
| 03/30/1999 | US5888944 Using acid sensitive surfactant to remove filter cake |
| 03/30/1999 | US5887668 Wellbore milling-- drilling |
| 03/25/1999 | WO1999014461A2 A plug for use in wellbore operations, an apparatus for receiving said plug, a plug landing system and a method for cementing tubulars in a wellbore |
| 03/24/1999 | CN2311600Y Off-axis bottom drilling tool combination |
| 03/23/1999 | US5884715 Method and apparatus for injecting drilling waste into a well while drilling |
| 03/23/1999 | CA2149591C Method and apparatus for downhole sand clean-out operations in the petroleum industry |
| 03/18/1999 | WO1999013196A1 Casing filling and circulating apparatus |
| 03/18/1999 | DE19749771C1 Packing material deposition method for supply line laying |
| 03/17/1999 | EP0901562A1 Downhole apparatus |
| 03/17/1999 | EP0662113B1 Pretreated clays, their preparation and use in formulating drilling muds not aggressive to layer clays |
| 03/16/1999 | US5882187 Portable flare tank |
| 03/16/1999 | US5881826 Aphron-containing well drilling and servicing fluids |
| 03/11/1999 | WO1999011903A1 Bypass valve for downhole motor |
| 03/11/1999 | DE19732480C1 Hydraulic drill with flushing feed |
| 03/10/1999 | EP0900320A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 03/10/1999 | CN2310150Y Screw lifting type pipe manifold for drilling |
| 03/04/1999 | WO1999010070A1 Improved helical separator |
| 03/02/1999 | US5875858 Low volume air-water drilling systems and methods |
| 03/02/1999 | US5875848 Weight management system and method for marine drilling riser |
| 02/24/1999 | EP0897454A1 Closed loop fluid-handling system for use during drilling of wellbores |
| 02/23/1999 | US5873420 Air and mud control system for underbalanced drilling |
| 02/23/1999 | US5873414 Bypass valve for downhole motor |
| 02/18/1999 | WO1998038411A3 Apparatus for use in drilling operations |
| 02/17/1999 | CN2307906Y Horizontal directional drilling rig mud device |
| 02/16/1999 | US5871052 Apparatus and method for downhole tool deployment with mud pumping techniques |
| 02/11/1999 | WO1999006668A1 A method of injecting drilling waste into a well while drilling |
| 02/04/1999 | WO1999005393A1 Bypass valve closing means |
| 02/04/1999 | WO1999005392A1 Method and apparatus for removing oil from oil-contaminated particulate material as e.g. waste drilling mud |
| 02/03/1999 | EP0866842A4 Drilling fluid loss prevention and lubrication additive |
| 02/03/1999 | CN2306312Y Well washing valve |
| 02/02/1999 | US5865261 Method of drilling a cased wellbore deeper |
| 01/28/1999 | WO1999004134A1 Cuttings injection system |
| 01/28/1999 | WO1999004133A1 Simulating the control of solids in drilling fluids, and application to determining the size of cuttings |
| 01/28/1999 | WO1999003601A1 Improvements in and relating to screens for shale shakers |
| 01/28/1999 | WO1999003586A1 Rotary shear |
| 01/27/1999 | EP0893571A2 Device for steering a drill string |
| 01/26/1999 | US5863430 Drilling mud separation system with removable continuous-belt separation unit |
| 01/26/1999 | US5862869 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations |
| 01/26/1999 | CA2007610C Down hole drills using spent driving fluid for flushing purposes |
| 01/12/1999 | US5857522 Method for separating constituents of a high pressure wellbore fluid |
| 01/07/1999 | WO1999000575A2 Drilling system with sensors for determining properties of drilling fluid downhole |
| 01/06/1999 | CN1204378A Fluid drilling system |
| 12/30/1998 | EP0886714A1 Device for drilling a bore hole in the ground |
| 12/29/1998 | US5853583 Multi-functional linear motion shaker for processing drilling mud |
| 12/23/1998 | CN1041313C Suspending medium for water soluble polymer |
| 12/22/1998 | USRE36002 Transmission sleeve for a down hole hammer |
| 12/22/1998 | US5850881 Drill pipe float valve and method of manufacture |
| 12/17/1998 | WO1998057027A1 Extension drilling system |
| 12/17/1998 | WO1998056497A1 Fluids containing viscoelastic surfactant and methods for using the same |
| 12/16/1998 | CN1201863A Sand washing process |
| 12/15/1998 | US5850621 Method for optimizing the characteristics of an axial fluid circulation in a variable annular space around pipes |
| 12/15/1998 | US5848656 Device for controlling underwater pressure |
| 12/10/1998 | WO1998055729A1 Valve for use in a wellbore |
| 12/08/1998 | US5846440 Apparatus and method for handling waste |
| 12/02/1998 | EP0880411A1 Screen for vibrating separator |
| 12/01/1998 | US5842529 Oil and gas well cuttings disposal system |