Water Well Drilling Rig

۩  Design and construction of water wells(including drilling , casing well development)

۩  Installation of submersible pump

۩  Hydrological modeling

۩  Design and modeling of hydraulic structures- weirs, dams, spill ways, drop structures, culverts etc.

۩  Waste water treatment etc.

Background information: Water Resources Systems

We look at water resources systems in two dimensions viz: a natural water resources system and a man- made water resources system. The first is a set of hydrologic elements in the natural environment that includes the atmosphere, water shed, wet land, flood plains, aquifers and groundwater systems, lakes, estuaries, seas and oceans. Man made water resources system is a set of constructed qualities for water supply and waste water management, drainage, flood control and water control in river reservoirs and aquifers quality. These man-made facilities also include conveyance systems such as canals, channels, pipes, diversion structures such as dams, storage facilities, pumping stations, hydro electric power plants, water wells etc.

Well Design

We take into consideration various components to well design. We consider the following: well depth, type of well, casing material, size and well thickness, intake design, monitoring and preventive maintenance provisions.

Well Depth

Based on tests prior to drilling and/or information gathered from existing wells in the vicinity, we drill to a targeted depth in order to hit the right aquifer for the highest possible production from the well.

Bethel Engineering Staff at Work

Rotary Drilling

We use rotary drilling to drill our water wells. Through our motorized rotary drilling rigs and skilled personnel we guarantee excellent jobs to our clients. Wells are drilled using a drill bit (made of diamond) on the end of a rotating drill stem. Drilling fluid is circulated down through the drill stem in the hole and back to surface to remove cuttings. Our Rotary drilling rigs can reach depth of over 300m (1000ft, with casing diameter of 10 – 45cm (4-8”))

Use of screens

During well completion; we use a screen or slotted / perforated casing liner. We use screen if the aquifer is composed of loose materials such as fine sand, gravel or soft sandstone. . A slotted or perforated casing / liner can be used when the aquifer formation more consolidated such as hard sand stone or fractured shale.

BES Staff Measuring High Pressure PVC Casing Pipes

Well Development

Well development is the process of removing fine sediment and drilling fluid from the area immediately surrounding the perforations. This increases the well’s ability to produce water and maximize production from the aquifer. We employ the following methods for well development: jetting, surging, backwashing and over pumping.

Test hole

Well design and construction details are determined after a test hole has been completed and the geographical zones have been logged. During the test hole drilling, we complete a formation log. Soil and rock samples are taken at various depths and the type of geologic material is recorded. This aids in identifying aquifers with the best potential for water supply. Also, to define the geologic formations, sometimes electric or gamma ray log are run in the test hole.
Another useful approach in getting to know about the geological zones in a proposed well site is by conducting a survey of existing wells in the area. This provides important information about the aquifer to tap into as well as the typical fields and water quality.

IR-T3W-1997 Model Water Well Rig