proefput

A proefput, also translated as a test well or exploratory borehole, is a borehole drilled to investigate subsurface conditions and to evaluate the potential for larger-scale extraction or development. It is used in fields such as groundwater management, oil and gas exploration, geothermal energy, and civil engineering projects.

The main purpose of a proefput is to obtain reliable information about the subsurface, including rock or sediment properties, groundwater yield and quality, pressure regimes, and potential reserves. By drilling a proefput, operators can assess permeability, porosity, aquifer extent, and the presence of contaminants or salinity. The results inform decisions on the feasibility of further drilling, well design, and production planning.

Construction and testing typically involve drilling with casing and surface seals, followed by geological logging, core sampling, and water sampling. Zone isolation with packers may be used to perform targeted tests. Common tests include pump tests or constant-rate discharge tests to measure drawdown and recovery, as well as formation testing to evaluate pressure and fluid properties. Geophysical logging and downhole measurements help characterize lithology and fluid conditions.

Outcomes of a proefput guide subsequent steps, such as additional exploratory wells, pilot production, or full development. Environmental protection, permitting, groundwater monitoring, well abandonment, and proper sealing are important regulatory and safety considerations.

See also: borehole, well, aquifer, hydrogeology.