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 34 - Valve arrangements for boreholes or wells
Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685)
07/1998
07/07/1998US5775428 Whipstock-setting apparatus
06/1998
06/30/1998US5771974 Test tree closure device for a cased subsea oil well
06/30/1998US5771927 Undersea hydraulic connector with equalization channel
06/25/1998WO1998027312A1 System for controlling and stopping oil drilling fires
06/25/1998WO1998005848A3 Method and apparatus for the downhole metering and control of fluids produced from wells
06/23/1998US5769162 Dual bore annulus access valve
06/18/1998WO1998026156A1 Electric safety valve actuator
06/18/1998WO1998026155A1 Blowout preventer control system
06/18/1998WO1998013579A3 Oil separation and pumping systems
06/17/1998CN2284297Y Pressuring oil discharger
06/17/1998CN2284296Y Oil discharger of electrical submersible pump
06/16/1998US5765641 Positionable in a subterranean well
06/16/1998US5765640 Multipurpose tool
06/16/1998US5765639 From an oil bearing formation penetrated by a well
06/11/1998WO1998025005A1 Method and apparatus for increasing fluid recovery from a subterranean formation
06/11/1998CA2192607A1 Natural gas production optimization switching valve system
06/10/1998EP0846218A1 Downhole apparatus
06/10/1998CN2283724Y Sealing valve for pumping well
06/09/1998US5762143 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells
06/04/1998WO1998023841A1 Apparatus and method for circulating fluid in a borehole
06/04/1998WO1998012413A3 Wellbore milling system
06/03/1998EP0845578A2 Sliding side door assembly for use in a wellbore
06/03/1998EP0845577A1 Wellhead assembly
05/1998
05/29/1998CA2217303A1 Wellhead assembly
05/28/1998WO1998022689A2 Whipstock
05/27/1998EP0844365A2 Valve for use in subterranean well
05/27/1998CA2221557A1 Metal-to-metal sliding side door for wells
05/26/1998CA2221435A1 One-trip whipstock setting and squeezing method
05/22/1998WO1998021447A1 Method for accelerating production - c-i-p ii
05/20/1998EP0597898B1 Tubing test valve
05/19/1998US5752570 Method and device for production of hydrocarbons
05/19/1998US5752569 Flow tube for use in an equalizing subsurface safety valve
05/14/1998WO1998020231A1 Method of and device for production of hydrocarbons
05/13/1998EP0840836A1 System for controlling production from a gaz-lifted oil well
05/13/1998EP0681666B1 Valve arrangement
05/06/1998EP0839255A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing
05/05/1998US5746249 Oil well blow-out preventer and sealing device
04/1998
04/30/1998WO1998017937A1 Undersea hydraulic connector with equalization channel
04/29/1998EP0745176B1 Gas lift system with retrievable gas lift valve
04/28/1998US5743331 Wellbore milling system
04/16/1998WO1998015711A1 Inflatable plug with anchoring means
04/16/1998CA2240001A1 Inflatable plug with anchoring means
04/15/1998CN2278765Y Internal string bidirectional spoiler
04/14/1998US5738336 Oilfield valve
04/14/1998US5738172 Filter for fluid circuits
04/09/1998WO1997048880A3 Downhole apparatus
04/07/1998US5735345 Shear-out landing adapter
04/02/1998WO1998013579A2 Oil separation and pumping systems
03/1998
03/31/1998US5732776 Downhole production well control system and method
03/26/1998WO1998012413A2 Wellbore milling system
03/24/1998US5730223 Sand control screen assembly having an adjustable flow rate and associated methods of completing a subterranean well
03/24/1998US5730222 Downhole activated circulating sub
03/18/1998EP0828922A1 Actuating ball
03/17/1998US5727775 For controlling fluid flow
03/11/1998CN2276072Y Multifunctional well-flushing valve
03/05/1998WO1998009055A1 Electrical/hydraulic controller for downhole tools
03/05/1998WO1998009052A1 Swivel
03/05/1998CA2233480A1 Electrical/hydraulic controller for downhole tools
03/04/1998CN2275640Y Multifunctional oil-well bottom valve
02/1998
02/25/1998EP0825328A2 Apparatus for formation testing
02/25/1998CN1174587A Method and apparatus for drilling with high-pressure, reduced solid content liquid
02/24/1998US5721538 System and method of communicating between a plurality of completed zones in one or more production wells
02/24/1998US5720349 For wellbore milling operations
02/19/1998WO1998006928A1 Variable orifice gas lift valve for high flow rates with detachable power source and method of using
02/17/1998US5718289 Apparatus and method for use in injecting fluids in a well
02/12/1998WO1998005848A2 Method and apparatus for the downhole metering and control of fluids produced from wells
02/11/1998EP0823538A2 Method of stimulating a subterranean well
02/11/1998EP0823537A1 Well stabilisation tool and method
02/05/1998WO1998004806A1 Plug comprising a disc valve
02/04/1998CN2273767Y Sectional type crude lifting tube off-loading apparatus
02/03/1998US5713389 Check valve and check valve seat
02/03/1998CA2080970C Short stroke casing valve with positioning and jetting tools therefor
01/1998
01/29/1998WO1998003766A1 Downhole two-way check valve
01/28/1998EP0820556A2 Cementing plug
01/27/1998US5711375 Well stabilization tools and methods
01/27/1998US5711372 Inflatable packer with port collar valving and method of setting
01/22/1998WO1998002635A1 Method for accelerating production-c-i-p
01/20/1998CA2181671A1 Downhole two-way check valve
01/17/1998CA2210458A1 Improved fluid circulation apparatus
01/13/1998US5706897 Drilling, production, test, and oil storage caisson
01/13/1998US5706896 Method and apparatus for the remote control and monitoring of production wells
01/13/1998US5706893 For a well
01/13/1998US5706892 Downhole tools for production well control
01/13/1998US5706891 Gravel pack mandrel system for water-flood operations
01/06/1998US5704425 For use in a multilevel borehole monitoring system
12/1997
12/31/1997WO1997049892A1 Christmas tree
12/31/1997CA2258932A1 Christmas tree
12/24/1997WO1997048880A2 Downhole apparatus
12/18/1997WO1997047853A1 Method and device for rinsing and/or cleaning delivery piping
12/18/1997WO1997047852A1 Downhole lubricator valve
12/16/1997US5697445 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means
12/10/1997EP0811748A1 Automatic downhole pump assembly and method for use of the same
12/10/1997EP0811747A2 Downhole tool and method for use of the same
12/09/1997CA2106699C Coiled tubing inflatable packer with circulating port
12/04/1997WO1997045623A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells
12/03/1997EP0595907B1 Improved sub-sea test tree apparatus
12/02/1997CA2049355C Drill stem test tools
11/1997
11/25/1997US5691712 Multiple wellbore tool apparatus including a plurality of microprocessor implemented wellbore tools for operating a corresponding plurality of included wellbore tools and acoustic transducers in response to stimulus signals and acoustic signals
11/18/1997US5687794 Subsea wellhead apparatus
11/18/1997CA2119633C Flow trim for choke
1 ... 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 ... 147