Boring or penetrating the earth – Natural vibration characteristic of an element of boring...
Patent
1992-06-24
1993-07-27
Britts, Ramon S.
Boring or penetrating the earth
Natural vibration characteristic of an element of boring...
175393, 137813, 137826, E21B 724, F15C 116, F15C 108
Patent
active
052303896
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a rotating tool equipped with an irrigation system making it possible to clean the tool with a fluid distributed by a fluidic oscillator. The invention is applicable, in particular, to oil well or mining drilling tools.
As is well known, a fluidic oscillator makes it possible to switch over a fluid flow passing through it in alternating fashion between two different directions, according to a frequency which is a function of the fluid-delivery rate and of the physical characteristics of the oscillator.
Among the most conventionally-used fluidic oscillators, mention may be made of Coanda-effect monostable oscillators, which normally comprise a feed nozzle emptying into a chamber distributing the fluid flow in two possible directions delineated between concentric surfaces. These latter are shaped so that the fluid is channelled in stable fashion in one of them, thereby favoring flow in one of the directions. This flow can be switched to the other direction when acted upon by an external force generating a low level of energy. Because flow in the new direction is unstable, it tends to switch back spontaneously to the stable direction when the force thus exerted is halted.
There also exist bistable Coanda-effect oscillators, in which the flow adheres in stable fashion to the two oscillator surfaces. In this case, an external force must be generated at the moment of each alternation so as to switch the flow from one direction to the other.
In addition, fluidic oscillators are known which operate according to the principle underlying a whistle, i.e., by means of the natural phenomenon of spontaneous vibration of air on either side of a rigid part which is pointed or ends in an edge.
The present invention concerns the application of fluidic oscillators to the irrigation of rotating tools, and, more specifically, to drilling tools comprising a head through which at least two ducts opening onto the surface of the head are drilled.
Patent No. FR-A-2 399 530 discloses a drilling tool equipped with a percussive weight mounted so as to move freely in a casing, and with a fluidic oscillator which drives this weight in an alternating, vibratory motion. However, this tool is not equipped with an irrigation system allowing its critical areas to be cleaned and cooled.
U.S. Pat. No. 3,405,770 concerns a drilling tool in which a fluid is subjected to a pressure-reduction cycle in the area of the drilling shaft, and, simultaneously, to increases in the speed of the fluid ejected. The fluid attacks the rock, but is not used to clean the tool.
U.S. Pat. No. 3,630,689 also concerns a drilling tool comprising a fluidic oscillator designed to generate phase-shifted fluctuations in the pressure in the two ducts. Here again, the jets of fluid are used to attack the rock, but not to clean the tool.
U.S. Pat. Nos. 3,532,174 and 3,610,347 disclose, furthermore, impact drilling tools. However, no means are provided for cleaning the tool.
Patent No. FR-A-2 352 943 concerns a drilling tool in which the fluid is emitted against the rock as two pressurized pulsed jets, in order to force the drilling debris to the outside of the well.
Finally, conventional practice makes use of a system for irrigating a drilling tool through a network of ducts drilled in the tool. The outlets of these ducts are fitted with nozzles suitably aimed for spraying, either directly or indirectly on selected portions of the tool, e.g., on the cutting edges, continuous streams of fluid capable of lifting away the rock and mud particles which adhere to them.
However, this irrigation system retains relative effectiveness to the extent that, since the total fluid discharged is divided among the nozzles, the force of each jet represents only a fraction of the total force of the fluid; as a result, the individual jets are sometimes too weak to clean the tool completely or to wash the critical areas.
Patent No. EP-0 171 852 concerns a drilling tool in accordance with the preface to claim 1. This tool is equipped with a filtering element making
REFERENCES:
patent: 3405770 (1968-10-01), Galle
patent: 3532174 (1970-10-01), Diamantides
patent: 3610347 (1971-10-01), Diamantides
patent: 4445580 (1984-05-01), Sahley
patent: 4630689 (1986-12-01), Galle et al.
patent: 4979577 (1990-12-01), Walter
patent: 5009272 (1991-04-01), Walter
patent: 5165438 (1992-11-01), Facteau et al.
Britts Ramon S.
Schoeppel Roger J.
Total
LandOfFree
Fluidic oscillator drill bit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluidic oscillator drill bit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluidic oscillator drill bit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2337759