Hydraulic wiper plug launcher

Details Hydraulic wiper plug launcher Hydraulic wiper plug launcher

1997-09-30

1999-09-14

Dang, Hoang C.

Wells

With below and above ground modification

Head for tool, piston or cleaner

1661774, E21B 33068

Patent

active

059507250

ABSTRACT:
A hydraulic wiper plug launcher (8) includes a coupler (22) releasably mounted on the upper end of a well casing (9). The outer coupler body (10) has an inner shoulder (49) and an open ended plug container (12) has a stack of wiper plugs (16) compressed therein. The upper end portion of container (12) forms a fluid chamber (S2) above the uppermost wiper plug (16). A precise predetermined volume of fluid is supplied to fluid chamber (S2) for expelling the plugs (16) in a controlled sequence. The length of the fluid chamber (S2) in container (12) increases an amount equal to the length of the wiper plug (16) pushed or expelled from the open lower end of the container (12).

REFERENCES:
patent: 2481422 (1949-09-01), Haynes et al.
patent: 3076509 (1963-02-01), Burns et al.
patent: 3971436 (1976-07-01), Lee
patent: 4246967 (1981-01-01), Harris
patent: 4674573 (1987-06-01), Bode
patent: 4775008 (1988-10-01), Cameron
patent: 5165474 (1992-11-01), Buisine et al.
patent: 5285852 (1994-02-01), McLeod
patent: 5443122 (1995-08-01), Brisco
Leo Burdylo and George Birch, Schlumberger Dowell, "Primary Cementing Techniques", Well Cementing, (Nelson) Elsevier Scientific Publications (1990).

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