E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/41
E21B 34/12 (2006.01) E21B 34/04 (2006.01)
Patent
CA 1205010
ABSTRACT A safety valve is disclosed which may be in- stalled on an offshore wellhead above the tubing head and below the Christmas tree. The valve has a housing with upper and lower vertical passages and a lateral housing passage. A cylindrical gate is disposed with- in the lateral passage and includes a "T" shaped pas- sage therein. The gate may be moved laterally and angularly within the lateral passage. During completion or workover of the well, the gate is moved laterally until the upper and lower vertical passages are in full open communication to run drills, hangers or other large diameter devices into the well via a BOP which may be attached to the top of the housing. During normal production, the gate may be laterally moved into the intersection of the vertical and lateral passages and the small through head part of the "T" passage serves to provide a vertical flow path through the production bore which is sealed off from the larger upper and lower vertical passages. Flow through side outlets in the housing is possible through the base of the "T" passage. The gate maybe angularly moved to have production to the lateral outlets via the head part of the "T" when the base part of the "T" is aligned with production tubing. Should the need arise, the valve may be angularly rotated to a position where the fluid flow path of the production tubing is completely shut in. This abstract of the disclosure is neither intended to define the scope of the invention, which is measured by the claims, nor is it intended to limit the invention in any way.
459040
Hynes Joseph H.
Morrill Charles D.
Hydril Company
Smart & Biggar
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