Block and module for seismic sources and sensors

1. Tubing conveyed seismic acquisition device, comprising a source and/or a sensor module for placement between a well casing and a production pipe, wherein the source and/or sensor module comprises a block equipped with acoustic transducers and/or sensor devices and clamping devices for clamping the block against the well casing,

wherein the block comprises a device for locking the block to the module in a first position where the block's surface is flush with the module's surface, a device for releasing the locking device, and a fluid circuit for controlling the operation of the locking and releasing devices,

and wherein the fluid circuit comprises a first chamber containing a fluid under pressure, a second chamber containing a fluid under a lower pressure, and a rupture disc arranged between the chambers,

the first chamber being connected to the locking device for controlling its position as a function of the fluid pressure in said first chamber,

the first chamber being also connected to the releasing device, this device controlling fluid supply and thus pressure in the first chamber,

the releasing device being adapted to increase pressure in the first chamber until rupture of the rupture disc, which causes the release of the locking device.

2. Acquisition device according to claim 1 , wherein the clamping device comprises at least one permanent magnet arranged on the block's surface facing the casing.

3. Acquisition device according to claim 1 , wherein the clamping device comprises at least one spring device arranged on the block's surface facing the production pipe.

4. Acquisition device according to claim 1 , wherein the clamping device comprises at least one permanent magnet arranged on the block's surface facing the production pipe for cooperation with a repellent permanent magnet arranged on the module.

5. Acquisition device according to claim 1 , wherein the locking device in the block comprises locking pins for cooperation with sockets in the module.

6. Acquisition device according to claim 1 , further comprising spacers arranged on the surface of the block adapted for apposition against the casing.

7. Acquisition device according to claim 1 , wherein a sensor device includes at least one geophone and at least one accelerometer.

8. Acquisition device according to claim 1 , wherein the acquisition device is an acoustic source.

9. Acquisition device according to claim 1 wherein the acquisition device is an acoustic sensor.

10. A seismic acquisition device adapted to be conveyed on a tube, comprising a source and/or a sensor module for placement between a well casing and a production pipe, a repellent permanent magnet arranged on the module, wherein the source and/or sensor module comprises a block equipped with an acoustic transducer and/or a sensor device and a clamping device for displacing the block from the module and clamping the block against the well casing, wherein the clamping device comprises at least one permanent magnet arranged on the block's surface facing the production pipe for cooperation with said repellent permanent magnet arranged on the module.

11. A seismic acquisition device adapted to be conveyed on a tube, comprising a source and/or a sensor module for placement between a well casing and a production pipe, wherein the source and/or sensor module comprises a block equipped with an acoustic transducer and/or a sensor device and a clamping device for displacing the block from the module and clamping the block against the well casing, and further comprising spacers arranged on the surface of the block adapted for apposition against the casing.

12. Acquisition device according to claim 10 or 11 , wherein the block comprises:

a device for locking the block to the module in a first position where the block's surface is flush with the module's surface,

a device for releasing the locking device, and

a fluid circuit for controlling the operation of the locking and releasing devices.