Method and apparatus for moulding protective tubing simultaneously with bore hole drilling
AssigneeCompagnie Francaise des Petroles
InventorsClaude Francois Gaudy, Adrien Giraud, Claude J. Tassin, Christian H. Pech
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Abstract
In a method of drilling a bore-hole, the bore-hole is protected against caving in as the drilling proceeds by the simultaneous moulding of a tubing on the bore-hole wall immediately above the drill tool. Preferably a sleeve is first moulded onto the bore-hole wall and the tubing is moulded onto the sleeve.
Claims20
A machine for exploratory drilling comprising a drilling tool;
- a motor for rotating the tool;
- a supporting body, an inflatable sleeve former on said body for forming a sleeve, said sleeve former having heating elements and an injection zone at its lower end;
- an inflatable tubing former on said body disposed above said sleeve former, for forming a tubing, said tubing former having heating elements and an injection zone at its lower end;
- and feed circuits for feeding sleeve moulding material to the injection zone of the sleeve former and for feeding tubing moulding material to the injection zone of the tubing former, wherein said motor is mounted below said body.
A machine for exploratory drilling comprising:
- a drilling tool;
- a supporting body for supporting said drilling tool;
- a motor for rotating the tool, said motor mounted below said supporting body;
- a tubing former on said body for forming a tubing, said former having an injection zone at its lower end;
- and feed circuits for feeding tubing moulding material to the injection zone, the feed circuits comprising a first channel for a thermohardening resin or cement and a second channel for a hardener, said channels feeding into a static mixer immediately upstream of the injection zone of said tubing former, a first valve controlling the supply of hardener to said static mixer and a second valve controlling the supply of the mixed materials to said injection zone.
A machine for exploratory drilling comprising:
- a drilling tool;
- a supporting body for supporting said drilling tool;
- a motor for rotating the tool, said motor mounted below said supporting body;
- a first inflatable annular sleeve fixed to said body;
- a second inflatable annular sleeve movably attached to said body;
- a hydraulic jack to control the movement of the second annular sleeve with respect to said body;
- a tubing former on said body for forming a tubing, said former having an injection zone at its lower end;
- and feed circuits for feeding tubing moulding material to the injection zone of the tubing former.
A method of exploratory drilling utilizing a drilling tool supported by means having at least one expandable member located thereon comprising the steps of:
- a. drilling a hole by passing the drilling tool downwardly through the earth;
- b. moulding a tubing around the wall of the drilled hole simultaneously with the downward movement of the drilling tool, to prevent caving in of the strata and ingress of water;
- c. expanding said expandable member laterally against the molded tubing so as to prevent relative movement between said expandable member and said tubing;
- d. exerting a force between the stationary expandable member and the drilling tool to cause the drilling tool to progress downwardly.
Dependencies are inferred from the claim text.