Apparatus and process for drilling casing with...

Details Apparatus and process for drilling casing with... Apparatus and process for drilling casing with...

2005-02-08

2005-02-08

Tsay, Frank (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S171000, C175S026000

Reexamination Certificate

active

06851490

ABSTRACT:
A large diameter bore—in the range of 30 inches or more—is made through a geologic formation, such as the active surf zone and into the maritime zone. The drill head is provided with a mud powered motor (typically of the Moyno variety) which drives a hydraulic pump connected to a plurality of closed loop hydraulic circuits remotely controlled through electrical connection along the large diameter bore. One hydraulic circuit powers the rotating drill head; a second hydraulic circuit powers a mud and tailings evacuation pump; and a third hydraulic circuit articulates the drill head to provide direction. Mud exhausted from the mud motor is exhausted to the cutting head of the drill and evacuated along with dislodged cuttings through a pump in the drill head. The pump is individually controlled to pump at a rate, which assures a slight negative pressure in the required annulus about the drilled conduit, thus assuring that any leakage is from the surrounding soil into the annulus.

REFERENCES:
patent: 3575245 (1971-04-01), Cordary et al.
patent: 3655001 (1972-04-01), Hoffman
patent: 3894402 (1975-07-01), Cherrington
patent: 4121673 (1978-10-01), Cherrington
patent: 4221503 (1980-09-01), Cherrington
patent: 4679637 (1987-07-01), Cherrington et al.
patent: 4711310 (1987-12-01), Luen
patent: 6722451 (2004-04-01), Saugier
Ives,. 30-Inch Line Bored Under Green's Bayou is “On Target”, Pipeline & Gas Journal 205:3: 40-42 (1978).

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