E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/41
E21B 43/12 (2006.01) E21B 21/00 (2006.01) E21B 21/08 (2006.01) E21B 21/10 (2006.01) E21B 33/064 (2006.01)
Patent
CA 1203471
ABSTRACT Apparatus is disclosed which is adapted for connection to a drilling conduit beneath a drilling rig floor for diverting pressurized well bore fluid in the conduit from the rig and sealing the annulus between a pipe or other object and the conduit or closing the vertical flow path of the conduit in the absence of any object in the conduit. The apparatus includes a housing, an annular packing element and two annular pistons. The housing is provided with two outlet passages in its wall. A first piston covers one outlet passage in the housing wall for preventing fluid communication between that outlet passage and the interior of the housing when it is in a nonactivated position and for aligning a first hole in the piston wall with the outlet passage for allowing fluid communication when the piston is in an activated position. The piston also serves to allow fluid communication between the second outlet wall passage and the interior of the housing via a second hole in the piston wall when the piston is in the normal position and to prevent fluid communication therebetween when the piston is in an activated position. Sequencing means are provided to insure that the second piston in the housing is moved axially upwardly sufficiently to urge the annular packing inwardly into sealing engagement with a pipe or other object in the bore only after the first piston closes the second outlet wall passage and opens the first passage. Permanently mounted support members are provided below the rig support structure of the rotary table into which the diverter is inserted. Cooperative alignment means are provided in the diverter and the support member in order that the outlet passages of the diverter may automatically mate with permanently mounted vent and flow lines. A seal member in the housing wall seals about the housing outlet to the first piston on the inside of the housing wall and to the permanent support member on the outside of the housing wall.
443155
Alexander Gabriel G.
Roche Joseph R.
Tippit Larry J.
Hydril Company
Smart & Biggar
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