| 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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| 09/30/2004 | US20040188143 Down hole drilling assembly with concentric casing actuated jet pump |
| 09/30/2004 | DE10310726B3 Core drilling arrangement with flushing has container for bore flushing with core material released from tube arranged in upper region of core drilling tube into which pump feeds, overflow openings |
| 09/29/2004 | EP1305100B1 A screen arrangement and a support structure for a vibratory separator |
| 09/28/2004 | US6797326 Method of making polycrystalline diamond with working surfaces depleted of catalyzing material |
| 09/28/2004 | US6796379 Drilling waste handling |
| 09/23/2004 | WO2004081337A1 Downhole bypass valve and method of using the same |
| 09/23/2004 | WO2003102348A3 Multi seam coal bed/methane dewatering and depressurizing production system |
| 09/23/2004 | US20040182607 Method of forming concrete pilings using a reverse circulation drilling system |
| 09/23/2004 | US20040182605 Positive pressure drilled cuttings movement systems and methods |
| 09/22/2004 | EP1356188B1 Fluid mixing system |
| 09/22/2004 | EP1114116B1 Aphron-containing well drilling and servicing fluids of enhanced stability |
| 09/21/2004 | US6792735 Advanced processes for coring and grouting masonry |
| 09/21/2004 | CA2301525C Improved helical separator |
| 09/21/2004 | CA2299951C Method and apparatus for handling and disposal of oil and gas well drill cuttings |
| 09/16/2004 | WO2004079161A1 Method and apparatus for detecting while drilling underbalanced the presence and depth of water produced from the formation |
| 09/16/2004 | WO2004079156A1 Methods and fluid compositions for depositing and removing filter cake in a well bore |
| 09/16/2004 | WO2004079155A2 Methods and apparatus for handling and drilling with tubulars or casing |
| 09/16/2004 | US20040178003 Dynamic annular pressure control apparatus and method |
| 09/16/2004 | US20040178001 Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling |
| 09/16/2004 | US20040177971 Washpipe assembly |
| 09/15/2004 | EP1161511B1 Aphron-containing oil base fluids and method of drilling a well therewith |
| 09/15/2004 | CN2641271Y Annlus logging, low flow pressure oil pumping well liquid flow control type well flushing device |
| 09/15/2004 | CN2641270Y Annulus logging, low flow pressure oil pumping well pressure control type well flushing device |
| 09/15/2004 | CN2641264Y Hydraulic coal drill with non-oil medium motor |
| 09/14/2004 | US6790811 Using amine surfactant |
| 09/14/2004 | US6789626 Apparatus and method for cleaning debris from wells |
| 09/14/2004 | US6789623 Method and apparatus for open hole gravel packing |
| 09/14/2004 | CA2306714C Apparatus and method for rapid replacement of upper blowout preventers |
| 09/14/2004 | CA2255253C Reduced shock landing collar |
| 09/10/2004 | WO2004076804A1 Drill shoe |
| 09/09/2004 | US20040176478 amphoteric/zwitterionic surfactant and an organic acid/salt and/or inorganic salts useful as a thickener for the suspension of particles |
| 09/09/2004 | US20040173353 Methods and fluid compositions for depositing and removing filter cake in a well bore |
| 09/08/2004 | EP1454032A1 Method and device for injecting a fluid into a formation |
| 09/08/2004 | EP1454028A2 Proppant recovery system |
| 09/08/2004 | CN2639512Y Temp. control flushing apparatus capable of annulus logging well temp of flow flow pressure pumping well |
| 09/08/2004 | CN2639511Y Continuous flushing device |
| 09/07/2004 | US6786629 Automated cement mixing system |
| 09/02/2004 | WO2004074627A1 Dynamic annular pressure control apparatus and method |
| 09/02/2004 | WO2004074586A1 Dredge device and dredge method |
| 09/02/2004 | US20040168800 Method and apparatus for formation damage removal |
| 09/01/2004 | EP1159509B1 Single valve for a casing filling and circulating apparatus |
| 09/01/2004 | CN2637709Y Well drilling liquid level ultrasonic wave monitoring device |
| 08/31/2004 | CA2198556C Drill bit having springless check valve |
| 08/26/2004 | WO2004072434A2 Methods and apparatus for wellbore construction and completion |
| 08/26/2004 | WO2003018951A8 Washpipe assembly |
| 08/26/2004 | US20040163852 Method and apparatus for boring through a solid material |
| 08/26/2004 | US20040163811 Fracturing tool having tubing isolation system and method |
| 08/26/2004 | US20040163808 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 08/26/2004 | US20040163803 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 08/25/2004 | EP1448866A1 Method and device for boring holes |
| 08/25/2004 | EP1448320A1 Apparatus and method for separating hydrocarbons from materials |
| 08/25/2004 | EP1151179B1 Removal of oil and chloride from oil contaminated material |
| 08/25/2004 | EP1075582B1 Subsea mud pump |
| 08/25/2004 | CN2635747Y Automatic constant pressure water supply device for drilling machine |
| 08/25/2004 | CN1523200A Sand flushing, pump lowering one time pipe column technique and pump passing, sand flushing and sand filtering equipment |
| 08/24/2004 | USRE38567 Apparatus and method for self adjusting downlink signal communication |
| 08/24/2004 | US6779606 Method and apparatus for heating drilling and/or completion fluids entering or leaving a well bore during oil and gas exploration and production |
| 08/24/2004 | US6779599 Tubular filling system |
| 08/24/2004 | CA2350858C Pressure pulse attenuator |
| 08/19/2004 | WO2004070159A2 Apparatus and methods for drilling a wellbore using casing |
| 08/19/2004 | US20040160858 Method and apparatus for determining downhole pressures during a drilling operation |
| 08/19/2004 | US20040159467 Continuous circulation drilling method |
| 08/19/2004 | US20040159465 Drilling method |
| 08/19/2004 | US20040159434 Providing a low pressure condition in a wellbore region |
| 08/19/2004 | US20040159432 Creating an underbalance condition in a wellbore |
| 08/19/2004 | CA2808302A1 Apparatus and methods for drilling a wellbore using casing |
| 08/19/2004 | CA2725717A1 Apparatus and methods for drilling a wellbore using casing |
| 08/18/2004 | CN2634101Y Damped type vibration sieve |
| 08/17/2004 | US6777377 Comprises water swellable clay, and water absorbent/swellable polymer (such as crosslinked polyacrlyamide); waterproofing; well completion |
| 08/17/2004 | CA2262304C Suction and discharge apparatus for a drilling fluid |
| 08/17/2004 | CA2233437C Apparatus for early evaluation formation testing |
| 08/12/2004 | WO2004067908A1 Multi-cycle downhole tool with hydraulic damping |
| 08/12/2004 | WO2004067903A1 Valve and method for drilling with casing using pressurized drilling fluid |
| 08/12/2004 | US20040154963 Polymer drilling bead recovery system & related methods |
| 08/12/2004 | US20040154839 Multi-cycle downhill apparatus |
| 08/12/2004 | US20040154835 Tong for wellbore operations |
| 08/12/2004 | US20040154834 Method and apparatus for removing fluids from drill cuttings |
| 08/12/2004 | US20040154806 Flow control apparatus for use in a wellbore |
| 08/12/2004 | US20040154805 Novel wellbore fluid circulation system and method |
| 08/12/2004 | US20040154798 Zero drill completion and production system |
| 08/11/2004 | EP1328458B1 Excavating tool having a device for transporting particles of magnetic material |
| 08/10/2004 | US6772837 Screen assembly having diverter members and method for progressively treating an interval of a welibore |
| 08/10/2004 | CA2308528C Method and apparatus for handling and disposal of oil and gas well drill cuttings |
| 08/10/2004 | CA2095583C Method for detecting drillstring washouts |
| 08/05/2004 | WO2004065756A1 Improved downhole apparatus |
| 08/05/2004 | WO2004065755A1 Rock drill machine and flushing housing |
| 08/05/2004 | WO2004053935A3 High power umbilicals for electric flowline immersion heating of produced hydrocarbons |
| 08/05/2004 | WO2004044366A3 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| 08/05/2004 | WO2004007897A3 Shale hydration inhibition agent and method of use |
| 08/05/2004 | US20040149437 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 08/05/2004 | US20040149395 Process and arrangement for separating oil from oil containing materials |
| 08/04/2004 | EP1159510B1 Wellbore primary barrier and related systems |
| 08/03/2004 | US6770601 Aphron-containing aqueous well drilling and servicing fluids |
| 08/03/2004 | US6769498 Method and apparatus for inducing under balanced drilling conditions using an injection tool attached to a concentric string of casing |
| 08/03/2004 | US6769490 Downhole surge reduction method and apparatus |
| 08/03/2004 | CA2161024C Remove fines from a spent aqueous well treating fluid |
| 07/29/2004 | WO2004040093A3 Drilling mud filtration device |
| 07/29/2004 | WO2004013448A3 Method for using coconut coir as a lost circulation material for well drilling |
| 07/29/2004 | WO2004007895A3 Mud saver valve |
| 07/29/2004 | WO2003069123A3 Drilling fluid screen and method |