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

FIELD: physics.

SUBSTANCE: source is made from pipes joined by a sleeve, having two rows of exhaust windows: lower main and upper ignitor windows. The cross-sectional area of the main windows is not smaller than that of the inner hole of the sleeve. In one of the tubes there is a downhole chamber and an ignitor chamber connected to each other through axial orifice holes in a shutter. The shutter is fitted into the sleeve on the neck of a hollow core and closes the main windows. When the main windows are closed, the shutter is pressed by a spring to a thrust shoulder on the core. The cavity of the downhole chamber is closed by a socket at the bottom. The cavity of the ignitor chamber is bounded by the butt-end of the housing at the top. There is a solid piston body inside the sleeve in the top cavity of the hollow core which enters the blind hole in the plunger. The piston body can move back and forth and opens the downhole chamber. Downward movement of the piston in the cavity in the core is restricted by the shoulder and its upward movement is restricted by the top end of the housing. In extreme positions of the piston, radial channels of the core and the plunger are joined and open, and closed in intermediate positions. The cavity over the piston is linked to the cavity underneath through large axial holes. The piston, sleeve and housing are such that their connection is the piston drive. In one of the pipes - the lower pipe - there is a receiver cavity which is closed at the top by a coupling sleeve and by a cover at the bottom. The receiver cavity is connected to the downhole chamber through feed channels, the axial and radial channels in the core and the radial channels in the plunger. In the top part of the source, there is a hydraulic suspension consisting of a slider whose sealing surface is mated with the housing and the tailpiece. The tailpiece is rigidly fixed in the top part of the housing. The cavity in the tailpiece is filled with oil and is linked through radial holes in the tailpiece with the oil cavity in the top part of the housing.

EFFECT: high pulse strength and easier operation.

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