CIRCUMFERENTIAL ARRAY BOREHOLE EVALUATION TOOL

摘要

An example apparatus for downhole cement inspection may include a tool body and an acoustic transmitter coupled to the tool body. An acoustic receiver may be coupled to the tool body at a first distance from the acoustic transmitter. A first array of acoustic receivers may be coupled to and positioned around a circumference of the tool body at a second distance from the acoustic transmitter. The second distance may be greater than the first distance. The acoustic receiver may be one receiver of a second array of acoustic receivers coupled to and positioned around the circumference of the tool body at the first distance. The first distance may be approximately three feet and the second distance may be approximately five feet.

主权项

1. An apparatus for downhole cement inspection, comprising:
a tool body; an acoustic transmitter coupled to the tool body; an acoustic receiver coupled to the tool body at a first distance from the acoustic transmitter; a first array of acoustic receivers coupled to and positioned around a circumference of the tool body at a second distance from the acoustic transmitter, wherein the second distance is greater than the first distance; and an electronics module communicably coupled to the acoustic transmitter, the acoustic receiver, and the first array of acoustic receivers, wherein the electronics module comprises a processor and a memory device coupled to the processor, the memory device containing a set of instructions that, when executed by the processor, causes the processor to
transmit from the acoustic transmitter at least one pressure pulse into a casing, cement layer, and formation in which the tool body is located;receive a first measurement from the acoustic receiver corresponding to a first bond between the casing and the cement layer; andreceive a second measurement from the first array of acoustics receivers corresponding to a second bond between the cement layer and the formation.