| Patents for E21B 28 - Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (888) |
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| 09/05/2002 | US20020121378 Method and apparatus to vibrate a downhole component |
| 08/28/2002 | EP1234099A1 Downhole pulser |
| 08/28/2002 | EP1234095A1 Method of improving the permeability of an earth formation |
| 08/21/2002 | EP1232330A1 Method and apparatus for seismic stimulation of fluid-bearing formations |
| 08/08/2002 | US20020104652 Methods of performing downhole operations using orbital vibrator energy sources |
| 08/06/2002 | US6427774 Process and apparatus for coupled electromagnetic and acoustic stimulation of crude oil reservoirs using pulsed power electrohydraulic and electromagnetic discharge |
| 07/25/2002 | WO2002057589A2 Internal power source for downhole detection system |
| 07/25/2002 | US20020096887 Vibration based power generator |
| 07/18/2002 | WO2002009231B1 Adaptive array antenna nulling |
| 07/18/2002 | US20020092651 Downhole coiled tubing recovery apparatus |
| 07/02/2002 | CA2212411C Method for improved water well production |
| 06/20/2002 | WO2002009231A3 Adaptive array antenna nulling |
| 06/18/2002 | US6405797 Enhancement of flow rates through porous media |
| 06/18/2002 | US6405796 Method for improving oil recovery using an ultrasound technique |
| 06/13/2002 | WO2002046578A1 Method for wave processing mainly productive strata |
| 06/13/2002 | WO2002046572A1 Method and apparatus for treating a wellbore with vibratory waves to remove particles therefrom |
| 06/13/2002 | US20020070017 Method and apparatus for treating a wellbore with vibratory waves to remove particles therefrom |
| 06/13/2002 | CA2398393A1 Method for wave processing mainly productive strata |
| 05/23/2002 | WO2002040829A1 Transducer receiving voltage inputs rich in harmonics, such as square waves |
| 05/21/2002 | US6390191 Method for stimulating hydrocarbon production |
| 05/16/2002 | WO2002038914A2 System and method for signalling downhole conditions to surface |
| 05/10/2002 | WO2002036935A1 Methods of performing downhole operations using orbital vibrator energy sources |
| 04/25/2002 | WO2002033217A1 Device for performing hydrodynamic action on wellbore walls |
| 04/03/2002 | CN2484402Y Vibration oil-extracting apparatus |
| 02/27/2002 | CN1079881C Hydraulic device to be connected in pipe string |
| 02/07/2002 | WO2002010554A1 Fracturing different levels within a completion interval of a well |
| 02/07/2002 | WO2002010553A1 Vibration based power generator |
| 02/06/2002 | CN2475823Y Low-frequency wave resonant oil recovery device for oil wall |
| 01/31/2002 | WO2002009231A2 Adaptive array antenna nulling |
| 01/15/2002 | US6338390 Method and apparatus for drilling a subterranean formation employing drill bit oscillation |
| 01/02/2002 | EP0901561B1 A hydraulic device to be connected in a pipe string |
| 01/02/2002 | CN1329207A Vertical guide wave oil production vibration equipment |
| 12/19/2001 | CN2466340Y Adjustable hydraulic counterweight device for oil production vibration starter |
| 12/11/2001 | US6328102 Method and apparatus for piezoelectric transport |
| 11/27/2001 | US6321836 Utilization of energy from flowing fluids |
| 11/22/2001 | WO2001088329A1 Method for vibrational impact on a pipe string in a borehole and devices for carrying out said method |
| 11/15/2001 | US20010040379 Vibration based downhole power generator |
| 11/07/2001 | CN2458423Y Electromagnetic output increasing device for use in well |
| 11/01/2001 | WO2001081707A1 Apparatus and method of oscillating a drill string |
| 10/24/2001 | CN2455921Y Acoustic device for reducing viscosity and dewaxing for petroleum |
| 10/17/2001 | CN2454526Y 磁化振荡器 Magnetization oscillator |
| 09/27/2001 | US20010023763 Utilization of energy from flowing fluids |
| 09/26/2001 | CN2450377Y Slide valve type hydraulic vibrator for oil well |
| 08/30/2001 | US20010017206 Enhancement of flow rates through porous media |
| 08/28/2001 | US6279653 Heavy oil viscosity reduction and production |
| 08/22/2001 | CN2444053Y Multi-frequency vibrator under pump |
| 08/16/2001 | WO2001059252A1 Coupled electromagnetic and acoustic stimulation of crude oil reservoirs |
| 08/16/2001 | CA2399909A1 Coupled electromagnetic and acoustic stimulation of crude oil reservoirs |
| 08/09/2001 | US20010011590 Process and apparatus for coupled electromagnetic and acoustic stimulation of crude oil reservoirs using pulsed power electrohydraulic and electromagnetic discharge |
| 08/02/2001 | WO2001055551A1 Vibration based downhole power generator |
| 08/02/2001 | CA2627854A1 Vibration based downhole power generator |
| 08/01/2001 | CN1306147A Radiation-type fluid-dynamic sound-wave wax preventor |
| 07/25/2001 | CN1305047A Ultrasonic water draining method for recovering gas |
| 07/18/2001 | CN2439538Y Low frequency sound vibration oil prodn. equipment |
| 07/05/2001 | US20010006108 Utilization of energy from flowing fluids |
| 06/26/2001 | US6250386 Process for stimulation of oil wells |
| 06/19/2001 | US6247533 Utilization of energy from flowing fluids |
| 06/07/2001 | WO2001040623A1 Method and apparatus for seismic stimulation of fluid-bearing formations |
| 06/07/2001 | WO2001040622A1 Downhole pulser |
| 06/07/2001 | WO2001040618A1 Method of improving the permeability of an earth formation |
| 06/05/2001 | US6241019 Enhancement of flow rates through porous media |
| 05/17/2001 | WO2001034937A1 Method and device for exciting transversal oscillations of a pipe string in a borehole |
| 05/15/2001 | US6230802 Method and apparatus for gravel packing a well |
| 05/15/2001 | US6230799 A housing carries ultrasonic transducer has active element, an electromagnetic field to change shape of active element, and acoustic element coupled to active element; reducing viscosity of a hydrocarbon-containing fluid in bore hole |
| 05/09/2001 | CN2429623Y Resonant vibrating machine besement |
| 05/08/2001 | US6227293 Process and apparatus for coupled electromagnetic and acoustic stimulation of crude oil reservoirs using pulsed power electrohydraulic and electromagnetic discharge |
| 04/12/2001 | WO2001025642A1 Method of cavitation of a flow of liquid and device therefor |
| 03/21/2001 | EP1085347A2 Apparatus and method for generating seismic vibrations |
| 03/15/2001 | DE19944032A1 Vorrichtung und Verfahren zur Erzeugung seismischer Schwingungen Apparatus and method for generating seismic vibrations |
| 03/14/2001 | CN1063252C Harmonic well vibration oil displacing system |
| 03/07/2001 | CN2422446Y Oil-well sonic wave plugging-preventing device |
| 02/22/2001 | WO2001012947A1 Method and device for restoring the permeability of the space adjacent to wells in a production horizon |
| 02/21/2001 | CN2420419Y Magnetic coagulation reducing viscosity reducing device |
| 02/13/2001 | US6186228 Methods and apparatus for enhancing well production using sonic energy |
| 02/07/2001 | CN1061731C Downhole radio-frequency electromagnetic oil production system |
| 01/24/2001 | CN2416226Y Electric detonation de-plugging apparatus |
| 01/17/2001 | CN2415156Y Vibration generator for increasing oil production |
| 12/20/2000 | CN1277310A Oil-exploiting and unblocking technology adopting low-frequency vibration |
| 11/28/2000 | US6152222 Hydraulic device to be connected in a pipe string |
| 11/15/2000 | CN2406058Y Underground mechanical viscosity-reducing device for oil well |
| 11/15/2000 | CN2406057Y Underground oil-extraction vibration apparatus |
| 11/15/2000 | CN2406056Y Underground oil-extraction vibration apparatus |
| 09/05/2000 | US6112808 Method and apparatus for subterranean thermal conditioning |
| 08/02/2000 | CN1261642A Increasing well yield by sound energy |
| 07/19/2000 | CN1260441A Reduction of heavy-oil viscosity and extraction of heavy-oil |
| 07/05/2000 | CN2386185Y Pumping well pump pulse vibration source |
| 06/29/2000 | WO2000037776A1 Method for generating a shock wave in the surrounding area of a well |
| 06/07/2000 | CN1053254C Well discharger for eliminating choke in oil well |
| 05/24/2000 | EP0753161B1 Acoustic sensor |
| 05/17/2000 | CN2378535Y Downhole pulse neutron generator |
| 05/09/2000 | US6059031 Utilization of energy from flowing fluids |
| 04/20/2000 | WO2000022280A1 Acoustic method (arwl) for applying an action on a well and on the layer of a field of mineral resources |
| 03/01/2000 | EP0981679A1 Process for stimulation of oil wells |
| 02/16/2000 | CN2364200Y Pulse vibration source under pump for pumping well |
| 01/19/2000 | CN2359451Y Centre-of-mass automatic adjusting oil production vibration generator |
| 01/18/2000 | US6015010 Dual tubing pump for stimulation of oil-bearing formations |
| 01/11/2000 | US6012521 Downhole pressure wave generator and method for use thereof |
| 01/04/2000 | US6009948 Resonance tools for use in wellbores |
| 12/01/1999 | CN2351542Y Underwell hydraulic pulse vibration generator for well cementation |
| 11/17/1999 | CN1046568C 大功率超声信号发生器 High-power ultrasonic signal generator |