Gas-gun for acoustic well sounding

Details Gas-gun for acoustic well sounding Gas-gun for acoustic well sounding

1984-09-04

1987-03-03

Lovering, Richard D.

Acoustics

Geophysical or subsurface exploration

Well logging

181115, 181117, 367144, G01V 104, G01V 1133

Patent

active

046468714

ABSTRACT:
In the art of acoustic well sounding a gas-gun for the sudden discharge of a measured quantity of compressed gas, comprised of two chambers, viz. a discharge chamber closed at one end by a poppet, and on the opposite end by a power-head, the latter a cylinder including a sealed piston, with the poppet connected by sealed piston rod penetrating the cylinder head, and terminated at the piston. The entire assembly to be so proportioned that regardless of the position of the piston a gap remains between the piston and the cylinder-head penetrated by the piston rod. Means for connecting this gap to the inside of the discharge chamber through a check valve permits gas flow from the discharge chamber to the gap, but not in the reverse direction, and means for venting the gap to the atmosphere. A passage from the opposite side of the piston to the axial outlet of the discharge chamber, a spring or a positive locking device for pressing the poppet against the valve seat. The entire construction is limited by the requirement that the piston rod be smaller in diameter than the seat diameter of the poppet, and the latter to be smaller than the diameter of the piston.

REFERENCES:
patent: 2560911 (1951-07-01), Wolf
patent: 3249177 (1966-05-01), Chelminski
patent: 3997021 (1976-12-01), Chelminski
patent: 4230201 (1980-10-01), Bays
patent: 4271924 (1981-06-01), Chelminski
patent: 4408676 (1983-10-01), McCoy
"Instructions for Sonolog D--6C2 Well--Attachment", Wolf et al.

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