---
title: "Explanation: Field test: Desanding / Desludging"
slug: feldtest-entsandung-entschlammung
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# Explanation: Field test: Desanding / Desludging

**Desanding or desludging** is a field test or preparatory measure in which a well or borehole is cleared of fine sediment, drill cuttings or sludge that has accumulated inside it. The aim is to establish or improve the functionality of the well lining and to create the conditions necessary for meaningful operation or further testing.

Typically, the following details are documented during desanding or desludging:

- the method used, e.g. clear pumping, air lift or flushing
- the duration and intensity of the operation
- observations regarding the volume of sand or sludge produced at the start and throughout the process
- changes in water level, turbidity and flow behaviour
- equipment used and key work steps
- any particular anomalies or indications of casing or filter problems

Desanding or desludging serves to restore the borehole or well to a functional state and to lay the foundations for a reliable assessment of its future performance.