System and method for installing production casings

Details System and method for installing production casings System and method for installing production casings

1975-07-14

1977-08-23

Gilliam, Paul R.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175 53, 175 62, 175 72, 175215, F16L 102, E02D 2910

Patent

active

040431363

ABSTRACT:
A system and method for emplacing a relatively large casing under and spanning an obstacle such as a river is disclosed. The casing is emplaced along the path of a previously bored and placed existing pilot string running beneath the obstacle. The pilot string extends typically in an inverted arcuate contour from a first position at or near ground level on one side of the obstacle to a second position at or near ground level on the other side of the obstacle. The system includes apparatus for concentrically reaming the pilot hole to an enlarged diameter and entraining the cuttings from the excavated annulus of the reaming operation in drilling mud. The casing is advanced along the reamed pilot hole in following relationship to the reaming apparatus. A seal is provided between the outer surface of the leading portion of the casing and the reamed pilot hole so that the drilling mud containing the entrained cuttings flows into the leading end of the advancing casing. The drilling mud flowing into the leading end of the casing is impelled, typically by an auger, toward the trailing end of the casing to remove the drilling mud from the reamed pilot hole and prevent the cuttings from settling in an annulus circumscribing the casing.

REFERENCES:
patent: 1993366 (1935-03-01), Englebright
patent: 2951680 (1960-09-01), Camp et al.
patent: 3589135 (1971-06-01), Ede
patent: 3635036 (1972-01-01), Hooper
patent: 3894402 (1975-07-01), Cherrington
patent: 3902563 (1975-09-01), Dunn

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