Researched DST tools. This is just one possibility. DST tools are generally applied by annular applied pressure. Pressure applied at surface has to reach the downhole tools to move operating pistons to either open test valves or circulating valves. The pressure loss through the heavy mud systems can result in insufficient pressure reaching the tools to allow proper operation. The settlement of solids from the mud system during the test can result in partial or complete failure of the downhole tools, resulting in poor data or no data being obtained.
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