US 12,270,262 B2
Float equipment for use with composite casing or liner string
Alexander Craig Mackay, Aberdeen (GB); and Douglas Farley, Missouri City, TX (US)
Assigned to DOWNHOLE PRODUCTS LIMITED
Filed by DOWNHOLE PRODUCTS LIMITED, Aberdeen (GB)
Filed on May 2, 2023, as Appl. No. 18/310,566.
Claims priority of provisional application 63/351,107, filed on Jun. 10, 2022.
Prior Publication US 2023/0399899 A1, Dec. 14, 2023
Int. Cl. E21B 34/06 (2006.01); E21B 17/16 (2006.01); E21B 21/10 (2006.01)
CPC E21B 17/16 (2013.01) [E21B 21/10 (2013.01); E21B 34/063 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A float collar for assembly with a composite string of downhole tubulars, comprising:
a tubular housing made from a composite material and having threaded couplings formed at longitudinal ends thereof;
a float valve disposed in a bore of the housing;
a sheath connecting the float valve to the housing and sealing an interface between the float valve and the housing; and
a guide operable to prevent side-tracking of a drill bit into the housing while drilling out the float valve and the sheath and comprising:
a shield disposed adjacent to an inner surface of the housing and made from a non-drillable metal or alloy,
wherein:
the guide further comprises a plurality of stacked segments, each segment of the plurality of segments has an inner hub portion and an outer ribbed portion, and a frusto-conical profile formed at a top of the sheath; and
the shield is a sleeve lining an inner surface of the housing at an interface between the sheath and the housing.