| 摘要 |
<p>A lift pump is designed so that the movement of the elongate lifting member (1) up and down in a wellbore causes a compression of an air mass in a tank (3, 9). The energy in this compressed air mass is used for carrying out the movement of the lifting member (1) upwards in the wellbore. The compression takes place by means of a piston (22) that is moved inside a vertical cylinder (3) under the influence of a train of rack segments (15) that are hinged to each other and are drive-actuated by a drive comprising frequency-controlled electromotors (30, 31) and pinions (35, 36) driven thereby which are in engagement with the teeth of the rack segments (15) in the rack segment train.</p> |
