WELL IMPLOSIVE SOURCE OF SEISMIC OSCILLATIONS Russian patent published in 2012 - IPC G01V1/02 G01V1/133 G01V1/147 

FIELD: mining.

SUBSTANCE: device comprises a casing rigidly fixed on a downhole motor, a cartridge fixed on a drilling string. The hollow casing is made with a piston fixed on a stem and installed tightly into the cartridge. The lower cover of the cartridge has a hole for free passage of a stem and transfer of torque. There are open pockets in the casing, where working chambers are installed and fixed with scraping pistons and compartments of signal registration. Signal registration compartments comprise a pressure sensor, a seismic recorder and also a unit of parameters recording from the specified instruments, equipped with the inner clock. Each chamber is closed at the bottom with the cover comprising a check valve, and at the top - with the cover comprising an axial hole, through which a scraping piston stem freely passes. The stem of the scraping piston with its upper end is rigidly fixed to the cartridge cover. Inside each chamber under the scraping piston there is a striker freely installed. Each striker is made with several spring hooks arranged in its upper part, capable of interacting with the inner bore of the axial hole in the scraping piston. In the upper part of each chamber there are windows opened with scraping pistons arranged in the uppermost position. In registration compartments there are sensitive elements that fix the speed of strikers movement. All parts of the device, apart from the strikers, are made of non-magnetic materials.

EFFECT: generation of a multiple seismic pulse in heavily inclined and horizontal sections of wells in process of well construction without lifting of drilling tools to the surface.

5 dwg