US 2019/0162870 A1 · MULTI-SPACING ARRAY TOOL

Abstract

Systems and methods to investigate multi-pipe structures for detection of corrosion and quantitative assessment of thickness in the multiple pipes can be implemented in a variety of applications. Systems can include a set of transmitters and multiple receivers arranged on a tool structure with variable distances to the transmitters of the set of transmitters, where the receivers are arranged to measure electromagnetic responses from a multi-pipe structure to excitation of the set of transmitters with the tool structure disposed in the multi-pipe structure. The electromagnetic responses may include responses correlated to a near field zone, a transition zone, and a far field zone, where the electromagnetic responses can be processed to recover individual thicknesses of each pipe of the multi-pipe structure. Additional apparatus, systems, and methods are disclosed.

Claims31

Dependent claims

A system comprising:

a set of transmitters;
multiple receivers arranged on a tool structure with variable distances to the transmitters of the set of transmitters, the receivers arranged to measure electromagnetic responses from a multi-pipe structure in response to excitation of the set of transmitters with the tool structure disposed in the multi-pipe structure;
and
a controller arranged to operate the set of transmitters, to acquire electromagnetic responses from the multiple receivers, and to process the electromagnetic responses from the multiple receivers using an inversion scheme to recover individual thicknesses of each pipe of the multi-pipe structure.

1 more element

A method comprising:

exciting a transmitter of a set of transmitters arranged on at tool structure disposed in a multi-pipe structure in a wellbore;
measuring electromagnetic responses, resulting from the excitation, at multiple receivers, the multiple receivers arranged on the tool structure with variable distances to the transmitter;
and
processing the electromagnetic responses from the multiple receivers using an inversion scheme to recover individual thicknesses of each pipe of the multi-pipe structure.

1 more element

Dependencies are inferred from the claim text.

Multi-spacing array tool

Life of this patent

Multi-spacing array tool

Life of this patent

Abstract

Claims31