摘要:
A method for measuring time of travel information of an acoustic return obtained from borehole logging operations avoids the phenomena of cycle skipping. The time of travel is determined from a threshold travel time and a digitization travel time. The threshold travel time is measured from the generated acoustic waveform to the detected threshold level of the acoustic return. The digitization travel time is measured from the threshold travel time to the time of the peak amplitude of the acoustic return.
摘要:
One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acoustic signal is acquired from a propagation along the drill string in an approximately noise free environment.
摘要:
One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acoustic signal is acquired from a propagation along the drill string in an approximately noise free environment.
摘要:
One embodiment includes a method comprising receiving an acoustic signal that is propagated along a drill string. The method also includes correlating the acoustic signal to a first stored acoustic signal representing a first symbol, wherein the first stored acoustic signal is acquired from a propagation along the drill string in an approximately noise free environment.
摘要:
Methods of controlling a downhole tool in a well are disclosed wherein pressure change signals are introduced into a column of fluid standing in the well. The command signal includes at least one high level pressure change applied to the column of fluid. The high level pressure change includes a change from a first value to a second value, with the second value being at least about 1,000 psi above hydrostatic pressure of the column of fluid in the well, and with pressure being maintained at the second value for an interval of time corresponding to information stored in a control system of the downhole valve. A number of suitable command signal formats are disclosed, particularly including pressure drop signals.
摘要:
Methods and systems for a surface instrumentation configuration for drilling rig-related operations are described. In one embodiment, pack off material is positioned in an annulus between a casing along sides of a borehole and a drill tubing in the borehole, wherein the pack off material includes surface instrumentation with an acoustic receiver. The acoustic receiver receives acoustic signals transmitted from the downhole instrumentation.
摘要:
One embodiment includes an apparatus that includes a piezoelectric transducer to generate an acoustic signal that is to modulate along a mandrel, wherein the piezoelectric transducer includes at least one piezoelectric element and at least one electrode that is without non-permanent joints.
摘要:
One embodiment includes an apparatus comprising a pack off material to be positioned in an annulus between a casing along sides of a borehole and a drill tubing in the borehole. The pack off material further includes surface instrumentation for communication with downhole instrumentation.
摘要:
One embodiment includes an apparatus that includes a piezoelectric transducer to generate an acoustic signal that is to modulate along a mandrel, wherein the piezoelectric transducer includes at least one piezoelectric element and at least one electrode that is without non-permanent joints.