Annulus cementing and washout systems for wells

Details Annulus cementing and washout systems for wells Annulus cementing and washout systems for wells

1987-12-16

1989-08-15

Neuder, William P.

Wells

Processes

Cementing, plugging or consolidating

166312, 166321, 166382, E21B 3313, E21B 2100

Patent

active

048565920

ABSTRACT:
An annulus cementing and washout technique and equipment, particularly for use in an offshore oil or gas well. An annulus is formed between an outer casing and a second-outer casing, this annulus being filled with cement up to a predetermined level and washed free of cement above said level. The second-outer casing is fitted with a washout casing section having washports at the predetermined level. The washports are selectively opened and closed by axially moving a hollow sleeve mounted in the washout casing section, preferably by turning the sleeve on a screw thread using a remotely operated tool. Details of a suitable tool include spring-loaded radial dogs which engage axial slots within the sleeve. Use of the sleeve and the tool to move the sleeve enables the washports to be opened and closed as required without troublesome rotation or support of the casing.

REFERENCES:
patent: 4625799 (1986-12-01), McCormick et al.
patent: 4657082 (1987-04-01), Ringgerberg

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