FIELD: mining.
SUBSTANCE: invention relates to geophysical investigations in cased wells, namely, to centering of geophysical instruments in cased wells. Centralizer of the downhole instrument consists of a guide rod with bodies at its ends, several pairs of levers connected to each other by axles with rollers, and the other ends are secured on holders, whose outer sides rest on springs. Holders and springs are fitted on bushes, moving along the thread on the rod. Outer ends of bushes have supports for springs. Internal ends of bushes have threads with nuts installed on them. At that, the opening diameter of opening of the centraliser is set by movement of bushes along the rod, while the bushes are fixed by lock nuts.
EFFECT: ensuring of the device centering and passableness in cased wells with any inclination angles and reduction of an emergency hazard during round-trip operations.
1 cl, 1 dwg
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