Boring or penetrating the earth – Processes – Sampling of earth formations
Patent
1983-09-22
1986-05-13
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Sampling of earth formations
175244, 175247, E21B 2500
Patent
active
045880360
ABSTRACT:
An apparatus and a method to obtain continuous undisturbed sampling, by rotational boring in non-plastic granular tills. The designation of non-plastic granular till refers to a heterogeneous glacial deposit containing an unstratified and unsorted mixture of silt, sand, gravel, cobbles and boulders with no clay particles. In the geotechnical terminology, this material is generally classified as a gravely silty sand with variable percentage of cobbles and boulders (the non-cohesive matrix consisting of silt and sand). The apparatus comprises a string of drill rods having a core barrel and a new designed coring bit of preselected diameter secured at an end thereof. A drive rotates the drill rod at a predetermined rpm, dependent on the coring bit diameter, to impart rotation to the coring bit to penetrate the core barrel in the soil at a predetermined rate. The coring bit has a crown shaped drilling head having a plurality of fluid convection channels therein. A mud drill fluid is convected under pressure over the drilling head through the passages and then into an outer circulation annulus outside of the coring bit not to disturb the granular till sample. The mud has a very high viscosity of at least 70 seconds as measured on a Marsh funnel and the flow rate is kept at a predetermined low value. An inner barrel is suspended in the core barrel and dimensioned for receiving therein the undisturbed sample of soil. Sample recovery is achieved by retrieving the core barrel inner tube by means of a wire line system and by reversing the circulation of the mud flow.
REFERENCES:
patent: 2145170 (1939-01-01), Frenzel
patent: 2277989 (1942-03-01), Kinnear
patent: 2365858 (1944-12-01), Binkley
patent: 3323604 (1967-06-01), Henderson
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patent: 3399739 (1968-09-01), Goodwin
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patent: 3481412 (1969-02-01), Rowley
patent: 3874464 (1975-04-01), Sweeney
Desrochers Gerard
Dubreuil Louis
Grumich Joseph
Hydro-Quebec
Neuder William P.
Novosad Stephen J.
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