Wells – Processes – Cementing – plugging or consolidating
Patent
1975-05-22
1976-05-25
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166253, 166289, 61 5366, 61 565, E21B 3313
Patent
active
039586375
ABSTRACT:
Method and apparatus for lining large diameter, deep, boreholes in the earth, which provides a relatively thick lining of cement. A slip form is provided having a cylindrical outer wall of the diameter corresponding to the desired inner diameter of the liner. This is supported on a long central pipe through which cement can be pumped through side pipes and through openings in the wall of the slip form. A base unit is provided with an internal diameter substantially equal to that of the slip form. A petal basket of flexible material is not provided to seal against the wall of the borehole. The slip form is attached to the base by means of shear pins, and the assembly lowered into the borehole until the base is on bottom. Cement is pumped down through the central pipe and out through the openings in the slip form to form a cement liner between the slip form, the base, and the wall of the borehole. When the cement reaches a first set, the slip form is lifted, breaking the shear pins. Cement is then pumped through the upper set of openings and the slip form is raised at a slow controlled rate, so that there is always support for the cement at the lowest part of the slip form, so that it has a residence time at least sufficient to reach that first set, before the slip form moves up. This process is continued until the complete liner is in place.
REFERENCES:
patent: 1916686 (1933-07-01), Sandstone
patent: 2080406 (1937-05-01), Allen
patent: 3001585 (1961-09-01), Shiplet
patent: 3131767 (1964-05-01), Chancellor et al.
patent: 3194312 (1965-07-01), Thomas
patent: 3202213 (1965-08-01), Howard
patent: 3239005 (1966-03-01), Bodine, Jr.
patent: 3293865 (1966-12-01), Loofbourow et al.
patent: 3335795 (1967-08-01), Richards et al.
Fraser Donald R.
Novosad Stephen J.
Shubert Roland H.
The United States of America as represented by the Secretary of
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