SU303422A1 - ACOUSTIC INSULATOR - Google Patents

Description

The proposed acoustic isolator is intended for use in the downhole tools of acoustic logging.

A known acoustic isolator for downhole acoustic logging devices, comprising nodal successively alternating elements of materials with high is low acoustic rigidity. The disadvantage of this acoustic isolator is that in order to effectively reduce the energy of the disturbance of an acoustic pulse propagating through the well device, the number of alternating elements with different acoustic rigidity must be sufficiently large, which leads to an undesirable increase in the total length of the insulator.

The aim of the invention is to eliminate this drawback and increase the effectiveness of acoustic insulation in downhole acoustic logging tools. To achieve this goal, surfaces of contact between elements with different acoustic stiffness are made conical with different angles of taper with respect to the axis of the insulator.

The proposed insulator consists of end / and 2 and intermediate 3 metal 1x parts and rubber parts 4 placed between them. The shape of the surfaces is chosen such that effects are obtained that lead to an increase in the energy dissipation of the passing acoustic imulses, and the possibility of sealing rubber parts to seal the insulator structure relative to external hydrostatic pressure.

The parts listed above are fastened using a metal pipe 5, at the ends of which the washers 6 are installed and the nuts 7 are screwed in. The pipe 5 and the washers 6 are separated from all other parts by rubber bushings 8. On the outer side, the insulator has a rubber sheeting 9. In Depending on the frequency composition and the pulse-interference energy, they can be varied in size and number of installed parts. The required electrical wires can be passed through the holes in the center of the pipe.

Subject invention

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