| 摘要 |
PCT No. PCT/FR95/00779 Sec. 371 Date Mar. 21, 1997 Sec. 102(e) Date Mar. 21, 1997 PCT Filed Jun. 14, 1995 PCT Pub. No. WO95/34741 PCT Pub. Date Dec. 21, 1995The invention relates to a tool for drilling oil, gas or geothermic wells. The tool includes two main members, a hollow shaft (1) and a blind tool body (2) more elongate than conventional tool bodies; the two main members are spherically connected to each other by means of a ball joint (4,5). The ball joint is located at the very bottom of the blind portion of the tool body which carries a stabilizer (19) at the other end. The tool is also provided, between the hollow shaft and the tool body, with an appropriate transmission system (6, 7, 8, 9, 11), which is spaced apart from the ball joint and situated between the latter and the stabilizer. The essential advantage of the tool lies in the relative position of the ball joint and the stabilizer, the positioning conferring on the tool a favorable dynamic behavior, without risk of buttressing. Field of application: drilling of oil wells, gas wells and geothermic wells.
|
