| Patents for E21B 28 - Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (888) |
|---|
| 10/21/1999 | WO1999039846A9 Downhole pressure generator and method for use |
| 10/19/1999 | US5969241 Method and apparatus for measuring formation pressure |
| 09/16/1999 | WO1999046478A1 Method for applying an acoustic resonance action on gas- and oil-bearing beds and device for realising the same |
| 09/14/1999 | US5950726 Increased oil and gas production using elastic-wave stimulation |
| 08/12/1999 | WO1999039846A1 Downhole pressure generator and method for use |
| 07/01/1999 | WO1999032757A1 A method to increase the oil production from an oil reservoir |
| 06/30/1999 | CN1221468A Hydraulic device to be connected in pipe string |
| 04/28/1999 | CN1215126A Downhole radio-frequency electromagnetic oil-production system |
| 03/31/1999 | CN2312320Y Multi-function vibration oil prodn. equipment |
| 03/17/1999 | EP0901561A1 A hydraulic device to be connected in a pipe string |
| 01/27/1999 | EP0819207A4 Method for improved water well production |
| 12/23/1998 | WO1998058156A1 Method and apparatus for subterranean magnetic induction heating |
| 12/18/1998 | CA2208197A1 Method and apparatus for subterranean thermal conditioning |
| 11/17/1998 | US5836394 Well regeneration apparatus |
| 11/17/1998 | US5836393 Pulse generator for oil well and method of stimulating the flow of liquid |
| 10/21/1998 | CN2295044Y Electric-impact unblocking instrument |
| 08/26/1998 | CN2289052Y Low frenquency pulse oil extraction instrument |
| 08/25/1998 | US5798488 Drilling apparatus |
| 08/12/1998 | CN1190151A Harmonic well vibration reservoir oil displacing system |
| 08/05/1998 | CN2287204Y Exciter for vibration screen |
| 07/23/1998 | WO1998031918A1 Process for stimulation of oil wells |
| 06/03/1998 | CN2283128Y Sound wave vibrating water filler |
| 05/13/1998 | CN2281414Y Piezo acoustic transducer |
| 03/18/1998 | EP0574584B1 Method for providing a user with a gas supply |
| 03/17/1998 | US5727628 Method and apparatus for cleaning wells with ultrasonics |
| 03/11/1998 | CN2276070Y Sounding element for piezoelectric acoustic wave transducer |
| 01/28/1998 | CN2273347Y Land electric spark focus deep well shaker |
| 01/21/1998 | EP0819207A1 Method for improved water well production |
| 01/08/1998 | DE19708140A1 Well regeneration appliance |
| 01/07/1998 | CA2209960A1 Well regeneration apparatus and method of regenerating wells |
| 01/06/1998 | US5704772 Controller less resilient bladder pump for reduced diameter casing with long cycle |
| 12/31/1997 | CN2271610Y Well electrospark explosion device |
| 12/11/1997 | WO1997046787A1 A hydraulic device to be connected in a pipe string |
| 12/03/1997 | CN1166568A Well discharger for eliminating choke in oil well |
| 11/11/1997 | US5685374 Well completions in weakly consolidated formations |
| 08/06/1997 | CN2258913Y Strong magnetic jet oscillation device for stimulation of injection well |
| 07/30/1997 | EP0585407B1 Apparatus for generating vibrational energy in a borehole |
| 07/23/1997 | EP0676530A4 Method of extracting gas from fluid-bearing strata. |
| 06/04/1997 | CN1150985A Disblockage injector cabable of reducing stratum and injection parts clogging |
| 05/13/1997 | US5628365 Method of producing gas from fluid containing beds |
| 04/02/1997 | CN2251038Y Self-excitation wave unblocking oil increasing device for pumping well |
| 03/19/1997 | CN1145445A Large power supersonic signal generator |
| 03/13/1997 | WO1997009511A1 Method of acoustically treating the productive zone of oil and gas wells and a device for carrying out the method |
| 01/22/1997 | CN2245659Y Shaking machinery multidimensional seismic wave base |
| 01/21/1997 | US5595243 Acoustic well cleaner |
| 01/15/1997 | EP0753161A1 Acoustic sensor |
| 01/01/1997 | CN2244089Y High power ultrasonic signal generator |
| 12/25/1996 | CN2243528Y Sound vibration generator for reduction of viscosity |
| 12/11/1996 | CN2242331Y Machine for shocking and lifting pipe or rod for oil-obtg. |
| 12/11/1996 | CN1137604A Underground vibrating oil production method using jarring process well |
| 12/10/1996 | US5582247 Methods of treating conditions in a borehole employing a backward whirling mass |
| 12/03/1996 | US5579845 Method for improved water well production |
| 10/12/1996 | CA2166156A1 Method and apparatus for shock wave stimulation of an oil bearing formation |
| 09/25/1996 | EP0733779A2 Method and apparatus for cleaning wells by means of ultrasound |
| 08/28/1996 | CN2233982Y Strong magnetic effect-increasing device |
| 08/21/1996 | CN2233455Y Movable oil production vibration generator |
| 08/15/1996 | WO1996024746A1 Method for improved water well production |
| 08/14/1996 | CN2232974Y Sound wave clog releasing device |
| 05/14/1996 | US5515918 Method of consolidating a slurry in a borehole |
| 04/09/1996 | CA2072919C Process to increase petroleum recovery from petroleum reservoirs |
| 11/02/1995 | WO1995029322A1 Method of working the bottom-hole zone of a seam |
| 10/12/1995 | WO1995027222A1 Acoustic sensor |
| 10/11/1995 | EP0676530A1 Method of extracting gas from fluid-bearing strata |
| 09/19/1995 | US5450899 Method of supplying gas to gas consumers |
| 06/06/1995 | CA2105686C Method of supplying gas to gas consumers |
| 03/14/1995 | US5396955 Method to selectively affect permeability in a reservoir to control fluid flow |
| 12/09/1994 | CA2098000A1 Perforation cleaning tools |
| 07/07/1994 | WO1994015066A1 Method of extracting gas from fluid-bearing strata |
| 07/07/1994 | CA2152899A1 Method of producing gas from fluid containing beds |
| 05/03/1994 | US5309405 Methods of employing vibrational energy in a borehole |
| 02/01/1994 | US5282508 Process to increase petroleum recovery from petroleum reservoirs |
| 12/22/1993 | EP0574584A1 Method for providing a user with a gas supply |
| 07/20/1993 | US5228508 Perforation cleaning tools |
| 05/11/1993 | US5210381 Apparatus for generating vibrational energy in a borehole |
| 02/18/1993 | WO1992021044A3 Apparatus for generating vibrational energy in a borehole |
| 11/26/1992 | WO1992021044A2 Apparatus for generating vibrational energy in a borehole |
| 10/27/1992 | US5159160 Downhole seismic energy source |
| 09/07/1992 | WO1992015511A1 Method for providing a user with a gas supply |
| 04/07/1992 | US5101899 Recovery of petroleum by electro-mechanical vibration |
| 12/11/1991 | EP0249609B1 Process for increasing the degree of oil extraction |
| 03/05/1991 | CA1281058C Process for increasing the degree of oil extraction |
| 09/19/1990 | CN1009672B Process for increasing degree of oil extraction |
| 12/05/1989 | US4884634 Process for increasing the degree of oil extraction |
| 12/23/1987 | EP0249609A1 Process for increasing the degree of oil extraction. |
| 07/01/1987 | CN86108326A Process for increasing the degree of oil extraction |
| 06/18/1987 | WO1987003643A1 Process for increasing the degree of oil extraction |
| 09/11/1984 | CA1174073A1 Methods and apparatus for well investigation and development |
| 08/05/1982 | WO1982002573A1 Methods and apparatus for well investigation and development |