Movable device for generating acoustic shear waves in the earth
AssigneeInstitut Francais du Petrole
InventorsJacques Cholet, Pierre-Claude Layotte
Life of this patent
Estimating the term…
Abstract
Device for generating shear waves in the earth for seismic prospecting, comprising means for striking with a mass a target-member coupled to the earth, said means including means for lifting and shifting said mass with respect to the target member, an electromagnet for intermittently locking it in an upper position and releasing it abruptly and means for adjusting the stroke of the mass from its upper position to its lower position where it impinges the target member.
Claims25
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, including a rigid support-member orientable with respect to said supporting structure, an elongate rigid member supporting the mass at an end thereof and automatic means for moving the mass by rotation of said rigid member with respect to said support-member.
A device for generating shear waves in the earth comprising a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, said means comprising a platform and an arm orientable in a vertical plane and supported by the platform, an elongate rigid member supporting the mass at an end thereof and adapted to rotate about an axle carried on said arm and means for moving the mass comprising a wheel carried on said axle, means for making the arm and the axle intermittently solid in rotation and a driving system comprising a rack solid with a jack, means for maintaining the rack in mesh with said toothed wheel and another mast carried by the platform and provided with an intermittently operated magnet system adapted to hold said mass.
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, including actuating members, orientable with respect to the target-member, for maintaining the mass in a plane containing the target-member and automatic control means for lifting the mass above the target-member and orienting its fall towards the target-member, wherein said mobile supporting structure is a self-propelling vehicle.
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, including movable actuating members, orientable with respect to the target-member, for maintaining the mass in a plane containing the target-member automatic control means for lifting the mass above the target-member and orienting its fall towards the target-member and means for imparting an additional force to said mass.
A device for generating shear waves in the earth, comprising a self-propelled vehicle to which are secured a target-member having a surface of contact with the earth, means for pressing the target-member against the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, said means including movable actuating members, orientable with respect to the target-member, for maintaining the mass in a plane containing the target-member and automatic control means for lifting the mass above the target-member and orienting its fall towards the target-member.
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface including a rigid support member orientable with respect to said supporting structure, a means for supporting said mass comprising at least a rigid arm pivotably mounted on the support member and jack means for moving the arm with respect to the support-member.
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, including an orientable rigid support member comprising a beam cooperating with a mast and having anchoring points for cables for maintaining the mass in a plane containing the target-member and automatic driving means for lifting said mass and shifting it laterally with respect to the target-member;
- said driving means comprising a cable fastened to said mass and bearing on the groove of a lazy pulley provided on the beam and laterally shifted with respect to the target-member, said cable being connected to a traction member carried on said rigid support-member.
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, including an orientable rigid support member comprising a beam cooperating with a mast and having anchoring points for cables for maintaining the mass in a plane containing the target-member and automatic driving means for lifting said mass and shifting it laterally with respect to the target-member;
- wherein the driving means comprises a carriage movable on a roller path carried by said beam, means for intermittently holding the mass at a variable height above the target-member and a driving system for varying said height and moving said carriage.
A device for generating seismic shear waves in the earth comprising a mobile supporting structure to which are secured a target-member having a surface of contact with the earth, a mass for striking the target-member and means for imparting to said mass a speed having a component parallel to said contact surface, including an orientable rigid support member comprising a beam cooperating with a mast and having anchoring points for cables for maintaining the mass in a plane containing the target-member and automatic driving means for lifting said mass and shifting it laterally with respect to the target-member wherein the beam is connected, at one of the ends thereof, to a retractable leg.
A device for generating shear waves in the earth comprising a target-member having a surface of contact with the earth, a mass for striking the target-member, an orientable rigid support-member comprising a platform and an arm orientable in a vertical plane and supported by the platform, an elongate rigid member supporting the mass at the end thereof and adapted to rotate about an axle carried on said arm, and means for moving the mass comprising a wheel carried on said axle, means for making said arm and said wheel intermittently solid in rotation and a system for driving said wheel.
Dependencies are inferred from the claim text.