| 摘要 |
<p>Downhole conditions in wellbores during drillstem testing or during wellbore stimulation or fracturing processes are transmitted through sensing and signal conversation circuits to axial or torsional wave vibrators secured to a drillstem or tubing string in the borehole for generating stress wave vibrations in the drillstem or tubing string for transmission to a point at or near the earth's surface. The system includes an axial compression wave generator (Fig. 7) comprising a solenoid (138) energized oscillatory hammer member (132) disposed on a sub (125) which may be interposed in the drillstem. A torsional wave vibration generator (Fig. 4) may be utilized comprising a sub having motor driven eccentric rotors (56, 58) which are driven in timed relationship to each other to generate selected torsional and/or bending stress waves in the drillstem or tubing string.</p> |
