Wells – Processes – Cementing – plugging or consolidating
Patent
1979-07-26
1981-01-27
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
1510406A, 166 75R, 166153, E21B 3305
Patent
active
042469678
ABSTRACT:
A cementing head apparatus is disclosed, for injecting a cementing plug into a well casing. The basic apparatus is made up of a head unit, manifold unit, and a tubular mandrel slidable within the manifold unit. Prior to injecting cement into the well casing, the cementing plug is mounted in the head unit and held in place by a shearable O-ring. During the cementing operation, part of the slurry stream flows through the head unit below the cementing plug, and part of the slurry collects in a "head" space above the plug. This arrangement provides an equal pressure force on both sides of the plug, to prevent premature injection of the plug into the well casing. When the desired amount of cement has been pumped, the mandrel is moved to a position which cuts off the cement flow and diverts another fluid only into the space above the plug. The resulting pressure above the plug shears the O-ring and allows the plug to follow the slurry down the well casing.
REFERENCES:
patent: 1011484 (1911-12-01), Perkins et al.
patent: 2164190 (1939-06-01), Klomp
patent: 2481422 (1949-09-01), Haynes et al.
patent: 2664163 (1953-12-01), Schnitter
patent: 3076509 (1963-02-01), Burns et al.
patent: 3216500 (1965-11-01), Diehl
patent: 3435895 (1969-04-01), Lee
patent: 3444928 (1969-05-01), Pitts
Novosad Stephen J.
The Dow Chemical Company
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