Cementing apparatus and methods

Details Cementing apparatus and methods Cementing apparatus and methods

1984-10-09

1987-05-12

Leppink, James A.

Wells

Processes

Cementing, plugging or consolidating

166154, 166242, E21S 3316

Patent

active

046641920

ABSTRACT:
In drilling a well, sections of casing are run down a borehole, preferably with a float shoe at the lower end which is equipped with a double valve enabling the casing to fill with drilling mud both while the casing is moving down and also while it is stationary. Within the casing is a baffle collar which defines a socket for a latching dart carried by a plug. The plug and dart are driven down to the collar, when the pumping of cement into the casing has been completed, by a launching dart which also closes the passageway through the plug.

REFERENCES:
patent: 3364996 (1968-01-01), Brown
patent: 4190111 (1980-02-01), Pavis
patent: 4250966 (1981-02-01), Streich et al.
patent: 4436151 (1984-03-01), Callihan et al.
patent: 4442894 (1984-04-01), Callihan et al.
patent: 4469174 (1984-09-01), Freeman

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