Cleanout procedure for well with low bottom hole pressure

Details Cleanout procedure for well with low bottom hole pressure Cleanout procedure for well with low bottom hole pressure

1976-06-28

1977-11-29

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

166267, E21B 2100, E21B 4325

Patent

active

040601307

ABSTRACT:
A cleanout procedure for use in a well with low bottom hole pressure that has become filled with sand. It employs a conductor string of pipe and a wash string of pipe inside the conductor string, both inserted in the well. A high pressure gas is applied to the inner annulus formed by the conductor and wash string, and the workover wash fluid is circulated down the wash string up the outer annulus formed by the well casing and the conductor string, to be joined by the gas and so wash out the sand through the outer annulus. Sand is separated at the surface.

REFERENCES:
patent: 1484601 (1924-02-01), Carmichael
patent: 2726063 (1955-12-01), Ragland et al.
patent: 2768694 (1956-10-01), Moll et al.
patent: 3268017 (1966-08-01), Yarbrough
patent: 3464495 (1969-09-01), Childers et al.
patent: 3497020 (1970-02-01), Kammerer, Jr.
patent: 3534822 (1970-10-01), Campbell

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