| 摘要 |
A wellhead has, instead of a conventional Christmas tree, a spool tree ( 34 ) in which a tubing hanger ( 54 ) is landed at a predetermined angular orientation As the tubing string can be pulled without disturbing the tree, many advantages follow, including access to the production casing hanger ( 21 ) for monitoring production casing annulus pressure, and the introduction of larger tools into the well hole without breaching the integrity of the well.
|
