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专利名称：Frequency regulation of an oscillator for use
in MWD transmission
发明人：Herman D. Collette申请号：US099453申请日：20010904
公开号：US20030043694A1公开日：20030306
专利附图：
摘要：An oscillating valve driven by the pressure in a mud pulser develops a pressurevariation in the mud pulse signal that is at a frequency that is different than thefrequencies of the mud system. The oscillating valve is coupled to or integral with the
pulse drive cylinder, whether the drive means for operation of the pulser is upstream ordownstream from the orifice, or whether or not the drive means and the poppet are onthe same side or opposite sides of the orifice. The oscillating valve is a bistable valvewhich preferably forms one wall of the drive piston of the pulser. Pressure from the drivecylinder behind the drive piston is directed in such a way as to unseat the bistable valve.When the bistable valve unseats, pressure is bled from within the drive cylinder, whichalso bleeds the pressure that unseated the bistable valve in the first place. Whenpressure drops, the bistable valve reseats, and the cycle repeats as long as pressure isbeing ported to the cylinder, thereby creating a tone in the drilling mud.
申请人：COLLETTE HERMAN D.
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