| 摘要 |
<p>The invention provides a system and method for measuring fluid velocity in well bores. The system and method includes the provision of a plurality of spaced magnetic markers (70) located at predetermined distances (d) along a line (40), a weight (100) connected to one end of the line (40) for holding the line at the bottom of the bore hole, and a basket (110) engaging the line for carrying a self-contained and sealed electronics package (90). When the basket (110) is selectively opened after a predetermined period of time, it flows upwardly at the rate of the fluid carrying the electronics package (90). A sensor (400) in the electronics package (90) detects the position of each magnetic marker (70) on the line (40) and the time elapsed between the detection of each successive markers (70) stored in memory. When the electronics package (90) is removed from the bore hole, the elapsed times stored for each marker (70) are read out and the velocity of the fluids flowing between each magnetic marker (70) is determined.</p> |
