| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 10/05/1994 | EP0618345A1 Method and apparatus for cementing a casing string |
| 10/01/1994 | CA2120108A1 Internally sealable perforable nipple for downhole well applications |
| 10/01/1994 | CA2083996A1 Dual retrievable standing valve cage |
| 09/29/1994 | WO1994021888A1 Annular chamber seal |
| 09/20/1994 | US5348089 Method and apparatus for the multiple stage cementing of a casing string in a well |
| 09/14/1994 | EP0615054A1 Coiled tubing actuated sampler |
| 09/14/1994 | CN2177089Y Water flushing valve |
| 09/13/1994 | US5346004 Environmentally secure polished rod liner head |
| 09/11/1994 | CA2118672A1 Coiled tubing actuated sampler |
| 09/07/1994 | EP0613514A1 Mud check valves in drilling apparatus (wells). |
| 09/07/1994 | EP0613406A1 Vacuum apparatus and process for in-situ removing underground liquids and vapors. |
| 09/06/1994 | US5343968 Downhole material injector for lost circulation control |
| 09/06/1994 | US5343965 Apparatus and methods for horizontal completion of a water well |
| 09/06/1994 | US5343963 Method and apparatus for providing controlled force transference to a wellbore tool |
| 09/06/1994 | US5343955 Tandem wellbore safety valve apparatus and method of valving in a wellbore |
| 09/06/1994 | US5343949 Isolation washpipe for earth well completions and method for use in gravel packing a well |
| 09/06/1994 | US5343946 High pressure packer for a drop-in check valve |
| 08/30/1994 | US5341883 Pressure test and bypass valve with rupture disc |
| 08/24/1994 | EP0611411A1 Two-part connector for fluid carrying conduits |
| 08/23/1994 | US5339864 Safety sub for retaining drilling fluids |
| 08/16/1994 | US5338001 Valve apparatus |
| 08/16/1994 | US5337827 Pressure-controlled well tester adapted to be selectively retained in a predetermined operating position |
| 08/16/1994 | US5337826 Tester valve |
| 08/10/1994 | CN2173861Y Automatic expansion oil drain device |
| 08/09/1994 | US5335731 Formation testing apparatus and method |
| 08/09/1994 | US5335730 Method for wellhead control |
| 08/09/1994 | US5335727 Fluid loss control system for gravel pack assembly |
| 08/04/1994 | DE4302447A1 Pipeline shut=off device |
| 08/02/1994 | US5333688 Method and apparatus for gravel packing of wells |
| 07/26/1994 | US5332045 Apparatus and method for placing and for backwashing well filtration devices in uncased well bores |
| 07/26/1994 | US5332044 Wellhead isolation tool and method of use |
| 07/26/1994 | US5332042 Fluid control valve |
| 07/26/1994 | US5332038 Gravel packing system |
| 07/26/1994 | US5332035 Shut-in tools |
| 07/26/1994 | CA2031569C Method and means for introducing treatment fluid into a subterranean formation |
| 07/21/1994 | WO1994016194A1 Method and apparatus for gravel packing a well |
| 07/20/1994 | EP0606981A1 Downhole valve apparatus |
| 07/19/1994 | US5330003 Gravel packing system with diversion of fluid |
| 07/19/1994 | US5329999 For a cased well |
| 07/19/1994 | CA1330756C Safety valve for production well |
| 07/13/1994 | CN2171672Y Bypass valve |
| 07/12/1994 | US5327960 Gravel pack installations for wells |
| 07/07/1994 | WO1994015064A1 Gravel packing system with diversion of fluid |
| 07/06/1994 | EP0470160B1 Well control apparatus |
| 07/05/1994 | US5325917 Short stroke casing valve with positioning and jetting tools therefor |
| 06/29/1994 | EP0604156A1 Pressure signal for remote control of downhole tool |
| 06/29/1994 | EP0604155A1 Remote control of downhole tool through pressure change |
| 06/29/1994 | EP0604135A1 Remote control multiple position downhole tool |
| 06/29/1994 | EP0604134A1 Control of well annulus pressure |
| 06/28/1994 | US5323859 Streamlined flapper valve |
| 06/28/1994 | CA1330432C Drill stem test method and apparatus |
| 06/19/1994 | CA2111737A1 Remote programming of a downhole tool |
| 06/14/1994 | US5320181 Combination check valve & back pressure valve |
| 06/14/1994 | CA2041960C Control apparatus and method responsive to a changing stimulus |
| 06/14/1994 | CA2021310C Inflatable straddle packer |
| 06/08/1994 | EP0599876A1 Multi-sensor relief valve well test system. |
| 06/08/1994 | EP0465503B1 Drill stem test tools |
| 06/07/1994 | US5318135 Soil displacement hammer with reversing mechanism |
| 06/07/1994 | US5318130 Selective downhole operating system and method |
| 06/07/1994 | US5318127 Surface controlled annulus safety system for well bores |
| 06/07/1994 | US5318120 Well testing valve |
| 06/07/1994 | US5318118 Cup type casing packer cementing shoe |
| 06/03/1994 | CA2084374A1 Valve device having stationary and movable or turnable valve bodies |
| 06/03/1994 | CA2084363A1 Erosion resistant valve |
| 05/31/1994 | US5316086 Combination well casing pressure relief and kill valve apparatus |
| 05/31/1994 | US5316084 Well tool with sealing means |
| 05/31/1994 | US5316081 Flow and pressure control packer valve |
| 05/25/1994 | EP0597898A1 Tubing test valve |
| 05/24/1994 | US5314026 Landing nipple |
| 05/24/1994 | US5314015 For use in a well bore |
| 05/24/1994 | US5314014 Packer and valve assembly for temporary abandonment of wells |
| 05/18/1994 | EP0597704A1 Flow testing a well |
| 05/18/1994 | EP0597703A1 Downhole toolstring and testing apparatus |
| 05/18/1994 | EP0596900A1 Valve actuator. |
| 05/18/1994 | CN2165224Y Down-hole multifunction device for pumping well |
| 05/14/1994 | CA2102957A1 Acoustic system and method for flow testing a deep well |
| 05/11/1994 | WO1994010449A1 Sludger |
| 05/11/1994 | EP0595907A1 Improved sub-sea test tree apparatus |
| 05/10/1994 | US5310005 Flapper valve assembly with floating hinge |
| 05/10/1994 | US5310004 Fail safe gas bias safety valve |
| 05/10/1994 | US5309993 Chevron seal for a well tool |
| 05/10/1994 | US5309988 Electromechanical shifter apparatus for subsurface well flow control |
| 05/05/1994 | DE4237050A1 Bohrlochpumpe Borehole pump |
| 05/04/1994 | CN2163867Y Automatic temp-control valve of water jacket furnace for thick oil wells |
| 04/27/1994 | EP0594393A1 Downhole formation testing apparatus |
| 04/27/1994 | EP0594390A2 Stage cementing well tool |
| 04/26/1994 | US5305988 Valves having involute sealing surfaces |
| 04/26/1994 | US5305833 Shifting tool for sliding sleeve valves |
| 04/26/1994 | US5305828 Combination packer/safety valve assembly for gas storage wells |
| 04/12/1994 | CA2012290C Shearing gate valve |
| 04/05/1994 | US5299641 Christmas tree for subsea production |
| 04/05/1994 | US5299640 Knife gate valve stage cementer |
| 03/30/1994 | EP0589687A2 Coiled tubing inflatable packer |
| 03/30/1994 | EP0589686A1 Differential pressure operated downhole valve |
| 03/30/1994 | EP0589586A2 Isolation washpipe for earth well completions and method for use in gravel packing a well |
| 03/29/1994 | US5297629 Drill stem testing with tubing conveyed perforation |
| 03/25/1994 | CA2106921A1 Dedicated perforatable nipple with integral isolation sleeve |
| 03/23/1994 | EP0424452B1 Plug for well logging operations |
| 03/23/1994 | CN1084244A Prodn. method for lead filled high gravity valve ball |
| 03/22/1994 | US5295534 Pressure monitoring of a producing well |