US 12,410,685 B2 · Using fluid pill for heat transfer downhole

Abstract

A method of cooling at least a portion of a downhole tool located within a drilled wellbore using a fluid pill configured to transfer heat away from a heat-generating segment of the downhole tool. The downhole tool may be a wireline logging tool. The fluid pill can comprise at least one fluid coolant and may include other additives that enable the fluid pill to transfer heat away from a heat-generating segment of the downhole tool even in the presence of one or more fluids present in the drilled wellbore. The fluid pill can be introduced into residual drilling mud in the wellbore, and the downhole tool may thereafter be operated with the heat-generating segment thereof in fluid contact with the fluid pill, whereby heat generated by the heat-generating segment is transferred away from the downhole tool and toward a wall of the wellbore by the fluid pill.

Claims20

Dependent claims

A downhole tool for use in a post-drilling operation, comprising:

a heat-generating segment;
a tool body positionable on a tool string for running the downhole tool into a drilled wellbore;
a first chamber and a second chamber separately defined within the tool body, each of the first chamber and the second chamber configured to releasably hold a fluid pill comprising one or more materials that enable the fluid pill to transfer heat from the heat-generating segment of the downhole tool to a wall of the wellbore;
at least one port in the tool body;
and
a pump within the tool body, the pump in fluid communication with the first chamber, the second chamber, and the at least one port, and operatable to selectively expel a fluid pill from one or both of the first chamber and the second chamber through the at least one port and into the drilled wellbore.

3 more elements

Dependencies are inferred from the claim text.

Using fluid pill for heat transfer downhole

Life of this patent

Using fluid pill for heat transfer downhole

Life of this patent

Abstract

Claims20