Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent
1977-09-19
1979-01-09
Purser, Ernest R.
Boring or penetrating the earth
With below-ground tool drive prime mover
Plural below-ground drive prime movers
175107, 175325, E21B 106
Patent
active
041333977
ABSTRACT:
A multiple in-hole motor and drill combination is disclosed for drilling a large diameter earth bore. The motor assembly is supported on a fluid circulating pipestring, and includes a plurality of circumferentially spaced longitudinally extended in-hole motor and drill combinations to which motor fluid is supplied through the running in pipestring, the motor fluid then passing through the rotary drill bit driven by the motor and returning to the top of the well. The plural in-hole motor drill assemblies are rotated during the drilling operation. A hydraulic drive motor powered by a separate fluid source is employed to rotate a housing to drive the multiple motor drill assemblies rotatably about the central support. The lower end of the multiple motor drill assembly supports a number of weights to apply drilling weight to the bits. The entire assembly is stabilized within the bore hole at vertically spaced locations or is stabilized within a well casing which is progressively lowered into the bore hole as the drilling progresses.
REFERENCES:
patent: 2016068 (1935-10-01), Bannister
patent: 2829864 (1958-04-01), Knapp
patent: 2942850 (1960-06-01), Heath
patent: 3161243 (1964-12-01), Davis
patent: 3386521 (1968-06-01), Chadderdon et al.
patent: 3989114 (1976-11-01), Tschirky et al.
Favreau Richard E.
Kriegel Bernard
Lee, Jr. Newton H.
Purser Ernest R.
Smith International Inc.
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