Downhole pressure fluctuating tool

Details Downhole pressure fluctuating tool Downhole pressure fluctuating tool

1985-03-04

1986-12-23

Leppink, James A.

Boring or penetrating the earth

Natural vibration characteristic of an element of boring...

137804, E21B 724

Patent

active

046306897

ABSTRACT:
A downhole pressure fluctuating tool having an improved acoustical circuit using a fluid oscillator to generate out-of-phase pressure fluctuations in two output legs, one connected to an acoustical compliance inside the tool and the other connected to an acoustical compliance exterior of the tool in a cavity partially formed by the wall of the well. An acoustical inertance with a pressure node at its midregion connects the two acoustical compliances, and said midregion communicates with the annulus between the body of the tool and the wall of the well to discharge fluid from the body at the pressure node to minimize acoustical losses in the annulus.

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