Method of plugging a well

Details Method of plugging a well Method of plugging a well

1980-01-28

1981-06-30

Leppink, James A.

Wells

Processes

Cementing, plugging or consolidating

166285, 166294, 166295, E21B 3338

Patent

active

042757886

ABSTRACT:
A method for forming a plug in a well bore by establishing a two-phase system within the well bore. The two-phase system includes a less dense phase which bears against the upper surface of a higher density phase to provide an interface between the two phases that is positioned at a desired location in the well-bore for formation of a plug. A hardenable plug material is injected at the interface between the two phases with the plug material having a density which is intermediate the densities of the less dense and more dense phases. The plug material is then permitted to harden to form a bond within the well bore. In the formation of the plug, the plug material floats on the more dense phase with the plug material being squeezed between the less dense and the higher density phases. Thus, the plug material is compressed and is also forced laterally into contact with the surface of the well bore to bond more securely to the well-bore surface during hardening of the plug material.
The two-phase system within the well bore may be made up of a more dense liquid and a less dense liquid; the latter floats on the more dense liquid and an interface is formed between the two liquids. Also, the two-phase system may be made up of a more dense liquid and a pressurized gas which contacts the upper surface of the liquid to form a gas-liquid interface. In either event, injection of the hardenable plug material at the interface between the two phases produces squeezing of the plug material between the two phases during hardening of the plug material.

REFERENCES:
patent: 2219325 (1940-10-01), Maness
patent: 2495352 (1950-01-01), Smith
patent: 2743779 (1956-05-01), Brown
patent: 3011547 (1961-12-01), Holbert et al.
patent: 3171481 (1965-03-01), Brown
patent: 3502148 (1970-03-01), Slagle et al.

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