Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Reexamination Certificate
2006-12-05
2006-12-05
Wong, Albert K. (Department: 2612)
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
C340S854400, C251S189000, C175S038000
Reexamination Certificate
active
07145834
ABSTRACT:
The preferred pulser is a mud powered oscillator powered by the pressure variation produced across the signal valve by the unstable action. The signal valve comprises a poppet and cooperating orifice. The pressure drop across the orifice is used to urge the poppet away from the orifice and an opposing spring drives it toward the orifice. The preferred poppet control is a permanent magnet that secures the poppet in at least the signal valve open position. To generate a pulse, the permanent magnet is opposed by a magnetizing coil arranged and powered by the associated MWD instrument to oppose the permanent magnet, to release the poppet to close the signal valve. The pulser is arranged to provide a generally central axially extending bore to accept a conductor extending axially through the pulser. Optional features include an acceleration compensator, and a mud powered electric energy generator. Optional features include hydraulic actuation and control of the poppet. The poppet can be fitted with an automatic pulse pressure amplitude control. The poppet can use overtravel to produce the on-pulse dwell time required to build pulse signal energy rather than the use of energy to hold the signal valve closed. Various mounting options are provided.
REFERENCES:
patent: 4825421 (1989-04-01), Jeter
patent: 4847815 (1989-07-01), Malone
patent: 5020609 (1991-06-01), Jeter
patent: 5117398 (1992-05-01), Jeter
patent: 6002643 (1999-12-01), Tchakarov et al.
patent: 6898150 (2005-05-01), Hahn et al.
patent: 6975244 (2005-12-01), Hahn et al.
Jeter John D.
Wong Albert K.
LandOfFree
Well bore communication pulser does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Well bore communication pulser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Well bore communication pulser will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3697788