| 摘要 |
<p>New apparatus and methods are disclosed for controlling the operation of a rod-pumped oil well (shown generally in Fig. 1). The load on (30, 32, 62, 100, 108) and position of (40, 48, 50, 64, 102, 108) the rod string (4, 8) are measured, an integration calculation (116) related to the work done during a portion of the downstroke (97, 98) is performed, and the result is compared (110) to a reference value (120), to detect a pumped-off condition in the well.</p> |
