| 摘要 |
PCT No. PCT/US93/05246 Sec. 371 Date Mar. 16, 1994 Sec. 102(e) Date Mar. 16, 1994 PCT Filed May 28, 1993 PCT Pub. No. WO93/24730 PCT Pub. Date Dec. 9, 1993A wellhead having, instead of a conventional Christmas tree, a spool tree in which a tubing hanger is landed at a predetermined angular orientation. The tubing string can be pulled without disturbing the tree and access may be had to the production casing hanger for monitoring production casing annulus pressure and for the introduction of larger tools into the well hole without breaching the integrity of the well. In the embodiment described, a valve is used to open and close a fluid pressure passage between the production casing annulus and a production casing annulus monitoring port in the spool tree.
|
