Indication of compression loading in downhole tool strings

A compression indication tool for use in a subterranean well, the compression indication tool comprising:

• an interior flow passage that extends longitudinally through the compression indication tool;
• and
• a valve that in a closed configuration prevents fluid communication through the valve between the interior flow passage and an exterior of the compression indication tool, and in an open configuration permits fluid communication through the valve between the interior flow passage and the exterior of the compression indication tool,
• in which the compression indication tool is configured for interconnection in a tubular string, in which application of a predetermined longitudinal compressive load to the tubular string causes the valve to shift from the closed configuration to the open configuration, and in which multiple seal bores of the compression indication tool are configured so that a pressure differential from the interior flow passage to the exterior of the compression indication tool acting on annular chambers between the seal bores resists longitudinal compression of the compression indication tool.