Apparatus for well cementing through a tubular member

Details Apparatus for well cementing through a tubular member Apparatus for well cementing through a tubular member

1982-06-07

1984-03-13

Novosad, Stephen J.

Wells

Pistons, fluid driven into well

Surrounding conduit valve or closure opened by piston

166318, 166317, 166319, E21B 3316, E21B 3306

Patent

active

044361513

ABSTRACT:
An apparatus for effecting two stage cementing of well conduits by supplying cement through a smaller diameter tubular member. The apparatus involved provides a tubular assembly attachable to the bottom end of a well conduit. The tubular assembly defines an axial cementing passage through its bottom end. Cementing ports are provided in the tubular assembly above its bottom end to implement the second stage cementing operation. A tubular member is sealingly secured in the upper end of the tubular assembly and valve units are provided between the end of the tubular member and the cementing ports. The lower annular valve unit is selectively releasably positioned in a closed position relative to the radial cement ports. At the conclusion of the first stage of cementing, a first sealing plug is dropped through the tubular member into sealing engagement with the bore of the lower annular valve unit and fluid is applied through the tubular member to shift the lower annular valve unit to an open position. After the second stage, a second sealing plug is dropped through the tubular member to seal the bore of the upper annular valve unit and fluid pressure applied through the tubular member will effect the displacement of the upper annular valve unit to a position sealing the radial cementing ports.

REFERENCES:
patent: 2435016 (1948-01-01), Pitts
patent: 3768556 (1973-10-01), Baker
patent: 3768563 (1973-10-01), Blount
patent: 3789926 (1974-02-01), Henley et al.
patent: 3811500 (1974-05-01), Morrisett et al.
patent: 4042014 (1977-08-01), Scott
patent: 4246968 (1981-01-01), Jessup et al.

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