| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 10/01/2008 | CN101275460A Thermal actuator |
| 10/01/2008 | CN101275459A Controlling flows in a well |
| 09/30/2008 | US7428927 Cement float and method for drilling and casing a wellbore with a pump down cement float |
| 09/30/2008 | US7428922 Valve and position control using magnetorheological fluids |
| 09/30/2008 | US7428921 Well treatment system and method |
| 09/30/2008 | CA2474518C Fracturing port collar for wellbore pack-off system |
| 09/30/2008 | CA2416040C Method for treating multiple wellbore intervals |
| 09/28/2008 | CA2622044A1 Position sensor for determining operational condition of downhole tool |
| 09/25/2008 | WO2008089200A3 Multiple dart drop circulating tool |
| 09/25/2008 | US20080230231 Downhole Safety Valve Apparatus and Method |
| 09/25/2008 | US20080230228 System and Method For Well Intervention |
| 09/25/2008 | US20080230227 Control System of an Actuator for the Actuation of Submarine Devices |
| 09/24/2008 | CN201121509Y Vibration damping environment friendly electronic driving down-hole oil tube plugging valve |
| 09/24/2008 | CN201121508Y Visible hidden lever flat gate valve |
| 09/24/2008 | CN201121507Y Oil production shaft mouth break valve |
| 09/24/2008 | CN201121506Y Combined well head control valve for oil production well |
| 09/24/2008 | CN201121505Y Control valve for oil well pouring with anti-shock performance |
| 09/24/2008 | CN201121501Y Pressure balancing oil production tree or gas production tree replacing device |
| 09/24/2008 | CN101273182A 油井安全装置和相关的安全设施 Well safety devices and related security facilities |
| 09/24/2008 | CN101270635A Installed mesh type miniature flow control valve and its processing method |
| 09/23/2008 | US7426962 Flow control device for an injection pipe string |
| 09/23/2008 | CA2496331C Seal assembly for a safety valve |
| 09/23/2008 | CA2409277C Wellbores utilizing fiber optic-based sensors and operating devices |
| 09/18/2008 | WO2008112334A1 Deformable ball seat and method |
| 09/18/2008 | WO2008112333A1 Valve and method for controlling flow in tubular members |
| 09/18/2008 | US20080223586 Ball release procedure and release tool |
| 09/18/2008 | US20080223581 Downhole Barrier Valve |
| 09/18/2008 | US20080223572 Method for drilling and casing a wellbore with a pump down cement float |
| 09/17/2008 | CN201116463Y Oil-well pump sand-proof oil drain valve |
| 09/17/2008 | CN201116460Y Inner brake type well head christmas tree |
| 09/17/2008 | CN101268249A Triple valve blow out preventer |
| 09/17/2008 | CN101265797A Flow string possessing water controlling valve and longitudinal rib |
| 09/17/2008 | CN101265793A Y tube self-balance type down-hole switch |
| 09/17/2008 | CN101265792A Hydraulic switch sliding bush |
| 09/17/2008 | CN101265791A Water controlling valve for oil extraction |
| 09/17/2008 | CN101265790A Hydraulic control security valve |
| 09/16/2008 | US7424922 Rotary valve for a jack hammer |
| 09/16/2008 | CA2458144C Screen assembly with flow through connectors |
| 09/12/2008 | WO2008109890A1 Push/pull belleville stack for use with zertech mtm seal |
| 09/12/2008 | WO2008109189A1 A downhole valve and method of making |
| 09/12/2008 | WO2008067152A3 Lubricator valve with rotational flip-flap arm |
| 09/11/2008 | US20080217020 Downhole valve and method of making |
| 09/10/2008 | EP1967691A1 Debris protection for sliding sleeve |
| 09/10/2008 | CN101260793A Horizontal sand spade for oil well |
| 09/10/2008 | CN101260792A Reducing sliding bush |
| 09/10/2008 | CN101260791A Raising-out type ball seat |
| 09/10/2008 | CN100417850C Internal blow out preventer ball and seat |
| 09/09/2008 | US7422065 System for controlling zones of fluid in and out of a wellbore |
| 09/09/2008 | CA2618432A1 Sucker rod pump with improved ball containment valve cage |
| 09/09/2008 | CA2450818C Valve system and method |
| 09/08/2008 | CA2620481A1 Debris protection for sliding sleeve |
| 09/04/2008 | WO2008106639A2 Improved system and method for stimulating multiple production zones in a wellbore |
| 09/04/2008 | WO2008104179A2 Drilling head for reborinq a stuck valve |
| 09/04/2008 | WO2008104178A1 Drilling tool with feed control |
| 09/04/2008 | US20080210431 Flapper latch |
| 09/04/2008 | CA2685063A1 Drilling head for reboring a stuck valve |
| 09/04/2008 | CA2685062A1 Drilling tool with feed control |
| 09/03/2008 | CN201110175Y Theftproof sampling valve for oil well |
| 09/03/2008 | CN201110174Y Primary oil sample valve |
| 09/03/2008 | CN201110165Y Double-knob stopcock for prevention blowout of welldrilling |
| 09/03/2008 | CN201110164Y Blowout prevention draining apparatus under pump |
| 09/03/2008 | CN201110163Y Ir-kill-job environment protection operation fluid pressure control uncoupling machine for water injection well |
| 09/03/2008 | CN201110162Y Multi-direction fluid flow tool |
| 09/03/2008 | CN201110161Y Anti-theft anti-unlatching oil field well head sluice valve |
| 09/03/2008 | CN201110160Y Combined reverse-filling resistance oil nozzle sleeve |
| 09/02/2008 | US7419003 Erosion resistant aperture for a downhole valve or ported flow control tool |
| 09/02/2008 | CA2389732C Wellbore system having non-return valve |
| 08/28/2008 | WO2008103495A1 Multi-purpose pressure operated downhole valve |
| 08/28/2008 | WO2008079782A3 Production actuated mud flow back valve |
| 08/28/2008 | WO2008079694B1 Charged chamber pressure transmitter for subsurface safety valves |
| 08/28/2008 | US20080202770 Wellbore Bypass Method and Apparatus |
| 08/28/2008 | US20080202109 Hydraulic Actuation Assembly |
| 08/27/2008 | CN201106436Y Well head special type valve |
| 08/26/2008 | US7416029 Downhole tool |
| 08/26/2008 | US7416026 Apparatus for changing flowbore fluid temperature |
| 08/21/2008 | WO2008101020A1 Communication tool for subsurface safety valve |
| 08/21/2008 | WO2008099166A2 Valve seat assembly, downhole tool and methods |
| 08/21/2008 | WO2008079777A3 Material sensitive downhole flow control device |
| 08/21/2008 | WO2008070051A3 Restriction element trap for use with and actuation element of a downhole apparatus and method of use |
| 08/21/2008 | US20080196898 Multi-Purpose Pressure Operated Downhole Valve |
| 08/20/2008 | CN201103379Y Oil tube discharging device |
| 08/20/2008 | CN201103378Y Gas lift valve for fast liquor drainage after oil-gas field high pressure operation |
| 08/20/2008 | CN201103377Y Gas pressure maintaining device of petroleum casing pipe |
| 08/20/2008 | CN201103369Y Shaft mouth anti-theft oil alarm device |
| 08/20/2008 | CN201103368Y Shaft mouth anti-theft oil sensor |
| 08/19/2008 | US7413018 Apparatus for wellbore communication |
| 08/19/2008 | CA2490505C Seal stack for sliding sleeve |
| 08/14/2008 | WO2008060891A3 Downhole lubricator valve |
| 08/14/2008 | US20080190623 Radial indexing communication tool and method for subsurface safety valve with communication component |
| 08/14/2008 | US20080190620 Single cycle dart operated circulation sub |
| 08/13/2008 | CN201100127Y Well-mouth theft-prevention sampler |
| 08/13/2008 | CN201100125Y A return-prevention device for gas injection and oil extraction well |
| 08/13/2008 | CN201100116Y Flexible sliding cover oil leakage part |
| 08/13/2008 | CN201100115Y Multi-purpose oil well gas injection valve |
| 08/12/2008 | US7409999 Downhole inflow control device with shut-off feature |
| 08/12/2008 | US7409996 Control system communication and lock open tool and method for locking open a safety valve and communicating with surface |
| 08/12/2008 | CA2504297C Gravity valve for a downhole tool |
| 08/12/2008 | CA2428165C Inserting flow diverter through tree cap |
| 08/07/2008 | WO2008095113A2 Chemical-injection management system |
| 08/07/2008 | WO2008094965A2 Rupture disc assembly that withstands much higher back pressures than actuation pressure |