IMPLOSIVE DOWNHOLE SEISMIC SOURCE Russian patent published in 2012 - IPC G01V1/133 G01V1/02 

FIELD: physics.

SUBSTANCE: device has a housing, a cable power point, a gear motor, a force actuator, a receiver and a piston which can move back and forth. The chamber housing has a groove through which an axial hole passes. A hollow rod is inserted into the axial hole on two sides and is joined under by a core to the piston and on top to the housing of the gear motor. A spring loaded valve is installed over the holes which link the chamber and the receiver. There is a cavity in the top part of the housing which is connected by a drainage hole to the working chamber and is closed by tail piece at the top. The top end of the rod enters said cavity. The gear motor having a tip describing translational motion is mounted in the top cavity of the tail piece. The core has an axial and a radial hole which link the inner cavity of the rod with the holes in the piston. The bottom of the receiver is rigidly attached to the compartment for picking up signals with an ambient pressure sensor and a sensor for positioning the source down the hole. The sensor for positioning the source down the hole is in form of spring-loaded permanent magnet drive which, through a sensitive element, switches on (when positioning the source down the hole) and switches off (when raising the source from the bottom) recording of parameters from the pressure sensor in the recording unit.

EFFECT: simple design and improved operational characteristics.

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