CH643324A5

CH643324A5 - Drilling head

Info

Publication number: CH643324A5
Application number: CH486081A
Authority: CH
Inventors: Daniel Vuille
Original assignee: Daniel Vuille
Priority date: 1981-07-27
Filing date: 1981-07-27
Publication date: 1984-05-30

Abstract

The drilling head is formed by a plasma torch (1) and by two or three grinding wheels (6). This plasma torch is supplied with electrical power via the conduit (2) and with plasma via the conduit (3). The cut material is cooled and discharged by pressurised vapour or water (4). <IMAGE>

Description

       

  
 

**ATTENTION** debut du champ DESC peut contenir fin de CLMS **.

 



   REVENDICATIONS
 1. Tête de forage, caractérisée en ce qu'elle comporte une ou plusieurs torches au plasma disposées entre deux molettes de broyage.



   2. Tête de forage selon la revendication 1, caractérisée par le fait que les torches à plasma sont alimentées directement par le train de tige.



   3. Tête de forage selon la revendication 1, caractérisée par le fait qu'elle comporte une alimentation électrique, hydraulique et plasmatique par le train de tige.



   4. Tête de forage selon la revendication 1, caractérisée par le fait qu'elle comporte une soute électronique équipée d'instruments de mesure.



   5. Tête de forage selon la revendication   I,    caractérisée par le fait que ses molettes de broyages et ses torches à plasma sont entraînées par l'intermédiaire d'un arbre qui entraîne lui-même une génératrice électrique, telle que turbine hydro-électrique, le train de tige ne tournant pas.



   La présente invention a pour objet une tête de forage pour puits de pétrole, de gaz et pour l'industrie géothermique.



   Le forage de puits de pétrole, de gaz ou géothermiques est obtenu actuellement avec l'ancienne méthode des molettes de broyage agissant par frottement direct sur la roche, I'avance du train de tige étant dictée par le poids de ce dernier, situé en dessus de la tête de forage. Un tel système présente plusieurs désavantages:
 1) Déviation importante du forage.



   2) Usure des molettes de broyage, ce qui occasionne toute la remontée du train de tige, avec la perte de temps que cela implique.



   3) Rupture du train de tige, due aux forces de frottement imprimées à ce dernier.



   Le but de la présente invention est la réalisation d'une tête de forage n'ayant pas les désavantages précités.



   Cela est obtenu grâce à la tête de forage selon l'invention, qui est caractérisée en ce qu'elle comporte une ou plusieurs torches au plasma, disposées entre deux molettes de broyage.



   La figure unique du dessin, annexée à titre d'exemple, représente une vue en coupe d'une forme d'exécution de l'objet de l'invention.



   La tête de forage représentée comprend deux molettes de broyage 6 situées à l'avant de la tête de forage. Une torche à plasma 1 est disposée dans l'axe de la tête entre les molettes de broyage 6. L'énergie électrique est amenée par le conducteur électrique 2 et le mélange du gaz plasmique par le conducteur 3. Le moteur électrique 7 entraîne la tête de forage. L'évacuation des déblais se fait sous la forme d'un flux d'eau ou sous forme de vapeur sous pression provenant du conducteur 4 alimenté par la surface. Le train de tige est donc constitué de trois conducteurs 5: un pour l'eau ou la vapeur sous pression 4, un pour le gaz plasma 3, et un autre pour l'énergie électrique 2. 

  Le conducteur du gaz 3 et le conducteur électrique 2 aboutissent dans la soute électronique où ils sont respectivement dirigés dans la partie rotative de la tête de forage par l'entremise de joints et de frotteurs étanches. La partie rotative de la tête de forage est celle qui est solidaire du roulement à billes 10. La cavité 9 est destinée à centraliser le liquide de déblaiement passant auparavant par les orifices 11. 



  
 

** ATTENTION ** start of the DESC field may contain end of CLMS **.

 



   CLAIMS
 1. Drilling head, characterized in that it comprises one or more plasma torches arranged between two grinding wheels.



   2. A drilling head according to claim 1, characterized in that the plasma torches are supplied directly by the rod train.



   3. Drilling head according to claim 1, characterized in that it comprises an electrical, hydraulic and plasma supply by the rod train.



   4. A drilling head according to claim 1, characterized in that it comprises an electronic hold equipped with measuring instruments.



   5. drilling head according to claim I, characterized in that its grinding wheels and its plasma torches are driven by means of a shaft which itself drives an electric generator, such as a hydroelectric turbine, the rod train does not rotate.



   The present invention relates to a drilling head for oil and gas wells and for the geothermal industry.



   The drilling of oil, gas or geothermal wells is currently obtained with the old method of grinding wheels acting by direct friction on the rock, the advance of the drill string being dictated by the weight of the latter, located above of the drill head. Such a system has several disadvantages:
 1) Significant deviation from drilling.



   2) Wear of the grinding wheels, which causes the entire stem train to rise, with the loss of time that this implies.



   3) Rupture of the rod train, due to the friction forces imparted to it.



   The object of the present invention is the production of a drilling head not having the aforementioned disadvantages.



   This is obtained thanks to the drilling head according to the invention, which is characterized in that it comprises one or more plasma torches, arranged between two grinding wheels.



   The single figure of the drawing, annexed by way of example, represents a sectional view of an embodiment of the object of the invention.



   The drilling head shown comprises two grinding wheels 6 located at the front of the drilling head. A plasma torch 1 is disposed in the axis of the head between the grinding wheels 6. The electrical energy is supplied by the electrical conductor 2 and the mixture of plasma gas by the conductor 3. The electric motor 7 drives the head drilling. The removal of the cuttings takes place in the form of a stream of water or in the form of pressurized steam coming from the conductor 4 supplied by the surface. The rod train therefore consists of three conductors 5: one for water or steam under pressure 4, one for plasma gas 3, and another for electrical energy 2.

  The gas conductor 3 and the electrical conductor 2 end up in the electronic hold where they are respectively directed into the rotary part of the drilling head by means of seals and waterproof wipers. The rotary part of the drilling head is that which is integral with the ball bearing 10. The cavity 9 is intended to centralize the clearing liquid previously passing through the orifices 11.

Claims

CLAIMS 1. Drilling head, characterized in that it comprises one or more plasma torches arranged between two grinding wheels.

2. A drilling head according to claim 1, characterized in that the plasma torches are supplied directly by the rod train.

3. Drilling head according to claim 1, characterized in that it comprises an electrical, hydraulic and plasma supply by the rod train.

4. A drilling head according to claim 1, characterized in that it comprises an electronic hold equipped with measuring instruments.

5. drilling head according to claim I, characterized in that its grinding wheels and its plasma torches are driven by means of a shaft which itself drives an electric generator, such as a hydroelectric turbine, the rod train does not rotate.

The present invention relates to a drilling head for oil and gas wells and for the geothermal industry.

The drilling of oil, gas or geothermal wells is currently obtained with the old method of grinding wheels acting by direct friction on the rock, the advance of the drill string being dictated by the weight of the latter, located above of the drill head. Such a system has several disadvantages: 1) Significant deviation from drilling.

2) Wear of the grinding wheels, which causes the entire stem train to rise, with the loss of time that this implies.

3) Rupture of the rod train, due to the friction forces imparted to it.

The object of the present invention is the production of a drilling head not having the aforementioned disadvantages.

This is obtained thanks to the drilling head according to the invention, which is characterized in that it comprises one or more plasma torches, arranged between two grinding wheels.

The single figure of the drawing, annexed by way of example, represents a sectional view of an embodiment of the object of the invention.

The drilling head shown comprises two grinding wheels 6 located at the front of the drilling head. A plasma torch 1 is arranged in the axis of the head between the grinding wheels

6. The electrical energy is supplied by the electrical conductor 2 and the mixture of the plasma gas by the conductor 3. The electric motor 7 drives the drilling head. The removal of the cuttings takes place in the form of a stream of water or in the form of pressurized steam coming from the conductor 4 supplied by the surface. The rod train therefore consists of three conductors 5: one for water or steam under pressure 4, one for plasma gas 3, and another for electrical energy 2.

The gas conductor 3 and the electrical conductor 2 end up in the electronic hold where they are respectively directed into the rotary part of the drilling head by means of seals and waterproof wipers. The rotary part of the drilling head is that which is integral with the ball bearing 10. The cavity 9 is intended to centralize the clearing liquid previously passing through the orifices 11. ** ATTENTION ** end of the CLMS field may contain start of DESC **.