| 摘要 |
Improved make-up, better seal higher resistance to overtorque and a reduction of the stress level (and, therefore, better stress corrosion cracking performance) are all obtained in the sleeve couplings of deep-well casings by the introduction of certain design improvements, such as (i), a profiled seat in the box member that matches the tube pin nose profile, and (ii) a new thread contour design that meets specific dimensional tolerances. |
