Method and apparatus for securing a lubricator and other equipment in a well
View Patent ↗A method and apparatus for anchoring a wireline lubricator assembly in a well. A locking assembly having radial locking pin members is disposed between a bell nipple assembly and blowout preventer assembly. With a lubricator assembly properly positioned relative to the locking assembly, automated locking pin members equipped with locking blocks can be actuated to move between retracted positions and extended positions. In the extended position, the locking blocks engage against the lubricator assembly, locking the lubricator assembly in place and preventing axial movement of the lubricator assembly relative to the locking assembly.
1. A lockdown apparatus for securing a lubricator assembly comprising:
a) a flange member surmounted on a blowout preventer assembly having a through bore, said flange member having a central bore aligned with said through bore of said blowout preventer assembly, and at least one substantially vertical transverse bore extending from the outer peripheral surface of said flange to said central bore;
b) a pin member slidably disposed within each of said at least one transverse bores and defining at least a first position and a second position;
c) a substantially rectangular locking block disposed at the end of each of said at least one pin members nearest the central bore of said flange, wherein each of said substantially rectangular locking blocks have a greater vertical thickness than said at least one pin member, and define a substantially greater surface area than said at least one pin member; and
d) a mandrel member connected to a lubricator assembly, said mandrel member comprising a recessed groove adapted to receive a portion of said substantially rectangular locking block;
wherein in said first position each locking block is positioned within said flange member, while in said second position a portion of each locking block is received in said recessed groove and a portion of each locking block is received in said flange member.
2. The lockdown apparatus of claim 1 , wherein said flange member is disposed between a bell nipple assembly and said blowout preventer assembly.
3. The lockdown apparatus of claim 2 , wherein said flange member is integrally formed with said bell nipple assembly.
4. The lockdown apparatus of claim 1 , further comprising a drive motor adapted to move said pin members within said at least one transverse bore.
5. The lockdown apparatus of claim 4 , wherein said drive motor is hydraulically powered.
6. The lockdown apparatus of claim 4 , wherein said drive motor is pneumatically powered.