| 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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| 01/22/1997 | EP0605562B1 Apparatus and method for removing drillhole debris |
| 01/21/1997 | CA2087866C Drill stem testing with tubing conveyed perforation |
| 01/15/1997 | EP0753161A1 Acoustic sensor |
| 01/14/1997 | US5593582 Two for one shale shaker |
| 01/08/1997 | EP0752047A1 Fill valve |
| 01/08/1997 | CN2244611Y High-speed rotary defoaming device |
| 01/07/1997 | US5590725 Drilling column with sledgehammer drilling head |
| 01/03/1997 | WO1997000371A1 Down hole hammer assembly |
| 01/03/1997 | CA2224656A1 Down hole hammer assembly |
| 01/02/1997 | EP0750715A1 Valve for use in float equipment |
| 01/02/1997 | EP0584110B1 A method and an arrangement for controlling the supply of air into a rock drilling machine |
| 01/01/1997 | CN2244086Y Device for automatically injecting drilling liquid |
| 01/01/1997 | CN2244085Y Vacuum well washing machine |
| 01/01/1997 | CN2244084Y Axial pressurizing device for directional well, high angle well and horizontal well |
| 12/31/1996 | US5589603 Method and apparatus for the injection disposal of solid and liquid waste materials from the drilling and production of oil and gas wells |
| 12/27/1996 | EP0750096A1 A method for injecting back-filling material into a space between the outside of double-wall pipes and the ground in the pipe-jacking method |
| 12/24/1996 | US5586729 Hazardous wastes disposal |
| 12/24/1996 | US5586609 Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 12/24/1996 | US5586608 Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling |
| 12/19/1996 | WO1996040836A1 Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling |
| 12/19/1996 | WO1996040599A1 Stable suspension of hydrocolloids |
| 12/19/1996 | CA2223731A1 Stable suspension of hydrocolloids |
| 12/19/1996 | CA2222536A1 Method of making an anti-bit balling well fluid using a polyol having a cloud point, and method of drilling |
| 12/18/1996 | EP0748924A2 Tank system for drillingmud |
| 12/17/1996 | US5584352 Pneumatic drilling chip removal system and method |
| 12/17/1996 | US5584343 Method and apparatus for filling and circulating fluid in a wellbore during casing running operations |
| 12/11/1996 | EP0747568A2 Logging-while-drilling tool |
| 12/11/1996 | EP0746664A1 Whipstock apparatus and methods of use |
| 12/10/1996 | US5582118 Removal of organic contaminants from solid particles |
| 12/05/1996 | WO1996038653A2 Device for controlling the weight on an earth drill bit |
| 11/26/1996 | US5577566 Releasing tool |
| 11/13/1996 | EP0741834A1 System, method and cutterhead for dry full-area drilling |
| 11/13/1996 | CN2240038Y Spiral-flow impact borehole-flushing apparatus |
| 11/12/1996 | CA2096999C Stabilization and control of surface sagd production wells |
| 11/05/1996 | US5571962 Method for determining wellbore depth of drill cuttings |
| 11/05/1996 | US5570749 Drilling fluid remediation system |
| 10/31/1996 | WO1996034175A2 Cementing plug |
| 10/31/1996 | WO1996033792A1 Shale shaker |
| 10/30/1996 | EP0740047A2 Device for controlling underwater pressure |
| 10/30/1996 | EP0613514B1 Mud check valves in drilling apparatus (wells) |
| 10/16/1996 | EP0737783A2 A casing for use in excavation of a borehole |
| 10/15/1996 | US5564509 Oil and gas well cuttings disposal system |
| 10/15/1996 | US5564500 Apparatus and method for removing gelled drilling fluid and filter cake from the side of a well bore |
| 10/09/1996 | EP0735928A1 Contaminant removal |
| 10/09/1996 | EP0735919A1 Solvent soaps and methods employing same |
| 10/09/1996 | CN2237108Y Downhole tool of hot washing technology |
| 10/09/1996 | CN1133087A Apparatus for testing shear thickening plugging fluid |
| 10/08/1996 | CA2045932C Method of and apparatus for detecting an influx into a well while drilling |
| 10/03/1996 | WO1996030628A1 Formation isolation and testing apparatus and method |
| 10/03/1996 | WO1996030621A1 Flow control tool |
| 10/01/1996 | US5561516 Casingless down-hole for sealing an ablation volume and obtaining a sample for analysis |
| 09/18/1996 | CN2235499Y Pneumatic lifting and removing rock device for vertical drilling machine |
| 09/11/1996 | EP0731253A2 Combating lost circulation during the drilling of wells |
| 09/10/1996 | US5553671 Piston sub for isolating drilling fluids from hydraulic fluids |
| 09/10/1996 | US5553667 Plug holding device |
| 09/05/1996 | DE4445334C1 Lubricant used to lubricate pipes being propelled into ground |
| 09/03/1996 | CA2101668C Self positioning dust seal holder |
| 08/28/1996 | EP0728909A2 Steerable rotary drilling system |
| 08/28/1996 | EP0728907A2 Steerable rotary drilling system |
| 08/28/1996 | CN1129726A Method of increasing viscosity of anion polyacrylamide solution |
| 08/27/1996 | US5549163 Piston sleeve valve for use with oilfield fishing operations |
| 08/14/1996 | CN2232975Y Well hydraulic programme controller |
| 08/14/1996 | CN2232974Y Sound wave clog releasing device |
| 08/08/1996 | DE19507172A1 Treatment plant for drilling mud built into transport containers for easy relocation |
| 07/25/1996 | WO1996022342A1 Base oil for well-bore fluids |
| 07/23/1996 | CA2019975C Apparatus for producing stabilizing mixture |
| 07/17/1996 | CN1126745A Lubricating composition including an esteruse of the composition and well fluid including the composition |
| 07/16/1996 | US5535836 Total recovery drill |
| 07/16/1996 | US5535834 Pumping liquid mixture containing alkyl or aryl metal sulfonate and solvent down drill stem with drilling mud to coat and lubricate drill and bore, also to flush cutting residues from bore |
| 07/16/1996 | CA2005301C Method of treating solids containing waste fluid |
| 07/09/1996 | US5533571 Fluid jetting apparatus for use in a well |
| 07/02/1996 | US5532211 Zirconium complex of 1-hydroxycarboxylic acids, aluminum citrate |
| 06/25/1996 | US5529285 Oilfield valve |
| 06/20/1996 | WO1996018800A1 Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 06/19/1996 | EP0717051A1 Process for obtaining grinding and/or dispersion aids by means of physico-chemical separation, thus obtained aids and their uses |
| 06/19/1996 | EP0636202B1 Use of pressurized medium in drilling |
| 06/18/1996 | US5527135 Method for injecting lubricant or back-filling material into a space between the outside of double-wall pipes and the ground in the pipe-jacking method and an apparatus therefor |
| 06/18/1996 | US5526887 Device for drilling holes in the crust of the earth, especially for drilling oil wells |
| 06/11/1996 | US5524717 Method of using a pressurized medium in drilling |
| 06/05/1996 | CN1031952C Manufacturing method for lead filled and high density faner ball |
| 05/29/1996 | EP0713909A1 Lubricating oil composition containing an ester, use thereof and well bore fluids containing the same |
| 05/23/1996 | WO1996015351A1 A drilling apparatus bit assembly and method to remove drill waste |
| 05/22/1996 | CN1122820A Non toxic, biodegradable well fluids |
| 05/14/1996 | US5515932 Apparatus and method for environmental surveying for contaminants in alluvial materials and bedrock formations |
| 05/09/1996 | WO1996013649A1 System, method and cutterhead for dry full-area drilling |
| 05/09/1996 | DE4438382A1 Determining plug open=closed position for stop valve |
| 05/09/1996 | CA2182605A1 System, method and cutterhead for dry full-area drilling |
| 05/07/1996 | US5513713 Steerable drillhead |
| 05/01/1996 | EP0709543A2 Downhole casing filling and circulating apparatus and method |
| 05/01/1996 | CN2226140Y Device for cleaning and removing blockage under well by jetting water |
| 04/30/1996 | US5511618 For use in cementing operations in oil and gas wells |
| 04/25/1996 | WO1996012082A1 Pressure converter |
| 04/23/1996 | US5509442 Mud saver valve |
| 04/16/1996 | US5507467 Actuator for a drill string internal blowout preventer |
| 04/11/1996 | WO1996007009A3 Casing and filling circulating head |
| 04/11/1996 | DE4436202A1 Ball valve mounted within the drill string, can be turned under high pressure by hand |
| 04/09/1996 | US5505262 Fluid flow acceleration and pulsation generation apparatus |
| 04/03/1996 | EP0690899A4 Non toxic, biodegradable well fluids |
| 04/02/1996 | US5504062 Injecting aqueous mixture containing calcium carbonate having graded particle sizes, nonionic scleroglucan type polysaccharide and a starch having its molecular weight increased by polymerization, enhanced oil recovery |
| 03/27/1996 | EP0703345A2 Boring ram |