Boring or penetrating the earth – Bit or bit element – Core forming type
Patent
1998-07-14
2000-12-12
Will, Thomas B.
Boring or penetrating the earth
Bit or bit element
Core forming type
175404, E21B 1002
Patent
active
061585343
DESCRIPTION:
BRIEF SUMMARY
This application claims the benefit of International Application PCT/BE 97/00003 having a priority date of Jan. 5, 1996.
SUMMARY OF THE INVENTION
The present invention relates to a core sampler, particularly for oil prospecting, comprising: core sampling, the inner barrel and outer barrel being substantially coaxial.
The annular space between the inner barrel and outer barrel is used to convey a core-sampling fluid toward the interior space of the inner barrel and/or toward nozzles of the bit.
There is a need to be able to convey this fluid and/or another coring fluid in a controlled way toward or from this interior space or alternatively toward a particular device of the core sampler, possibly so that each of the coring fluids is controlled independently.
Surprisingly, in order to solve this problem, it has proved highly advantageous to provide, according to the invention, within a core sampler of the aforementioned type: barrel and delimiting, on the one hand with the outer barrel, a first longitudinal channel for a core-sampling fluid and, on the other hand, with the inner barrel, a second longitudinal channel for a core-sampling fluid, the longitudinal channels and the interior space each having a front end close to the coring bit and a rear end remote from this bit, and coring-fluid communication between the rear end of the second longitudinal channel and/or that of the first longitudinal channel and/or that of the interior space.
As a preference, according to the invention, the aforementioned selective means at least temporarily place in fluid communication a duct for supplying a coring fluid from a reservoir on the surface and nozzles of the bit, via the first longitudinal channel and, advantageously, the selective means at least temporarily place in fluid communication the rear end of the aforementioned interior space and the duct for supplying fluid.
According to one advantageous embodiment of the invention, the selective means comprise a controlled valve designed to selectively block a flow of fluid from the supply duct toward the interior space and so as possibly to allow a flow from this space toward the supply duct, if appropriate toward the first longitudinal channel.
According to another particularly advantageous embodiment of the invention, the selective means at least temporarily provide a fluid communication between the supply duct and the second longitudinal channel, and comprise an auxiliary controlled valve designed to selectively block a flow of fluid from the supply duct toward the first longitudinal channel.
According to yet another embodiment of the invention, interior space and the second longitudinal channel, practically the front end of the interior space toward the rear end thereof, by a core sample which is being formed, and and the rear end of the interior space.
Depending on the particular application for which the core sampler of the invention is intended, it may be preferable that that they can rotate independently of one another about their common longitudinal axis and the inner barrel is then mounted so that it is unable to move, at least in terms of rotation, with respect to the middle barrel, stationary with respect to one another, at least as far as their rotation about their common longitudinal axis is concerned, and the middle barrel and the inner barrel are then mounted so that they can rotate independently of one another about their common longitudinal axis.
Other details and particular features of the invention will emerge from the secondary claims and from the description of the drawings which are appended to this text and which illustrate, by way of nonlimiting examples, some advantageous embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts diagrammatically, in longitudinal section, with cutaway, a front end of a core sampler according to one embodiment of the invention.
FIG. 2 depicts diagrammatically, in longitudinal section, with cutaway, the core sampler of FIG. 1, at the point of connection of the inner, middle and outer bar
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patent: 2189057 (1940-02-01), Copelin
patent: 2658726 (1953-11-01), Stokes
patent: 2713473 (1955-07-01), Talbot
patent: 3833074 (1974-09-01), Courtois
patent: 4466497 (1984-08-01), Soinski et al.
Baroid Technology Inc.
Petravick Meredith
Will Thomas B.
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