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FINANCIAL  INDUSTRIAL  HOLDING
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Hydrogeological drilling for water

DRILLING WELLS FOR WATER

Hydrogeological surveillance searching for massive water intake includes:

  • Preparation.
  • Field geological, geophysical, and hydrogeological surveillance, exploratory hydrogeological drilling.
  • Drilling and developing water intake wells.
  • Creating reports.

Hydrogeological surveillance with the purpose to build a large water intake facility includes:

  • Preparation.
  • Field geological, geophysical, and hydrogeological surveillance, exploratory hydrogeological drilling.
  • Drilling and developing water intake wells.
  • Creating reports.

Field geological, geophysical, and hydrogeological surveillance

Field geological, geophysical, and hydrogeological surveillance includes:

  • Preparation of profiles and platforms along projected lines using bulldozers.
  • Conducting geophysical research using vertical electric sounding (VES) and electric sounding according to preplanned profiles.
  • Drilling exploratory wells of smaller diameters.
  • Comparing results of geophysical research and exploratory drilling, drilling of exploratory and hydrogeological wells on promising plots of land.
  • Pumping using airlift to establish a quasi-stationary mode.
  • Calculation of expected flow rate in the wells and expected decrease in levels in the future.
  • In wells with the highest debit based on airlift pumping with resistivimetry with salinization to determine water intake intervals and rationalize the intervals for filter installation.
  • Pumping for 48—72 hours in wells with the highest specific debits to accurately determine filtration parameters.

Drilling and developing water intake wells of large diameters

Drilling and developing water intake wells of large diameters is conducted in the following order:

  • Drilling large diameter (350—400mm) holes with pipes of slightly smaller diameter (320mm) along the formations of loose sediment and weathering crusts.
  • Hammer drilling with 250mm diameter through bedrock.
  • Removing temporary pipes with the 320mm diameter.
  • Installing PVC pipes and filters with 200؅—225mm diameter.
  • Cementation of the wellhead to the depth of 6—8 meters.
  • Building a concrete platform sized 2x2m at the wellhead with the PVC pipe exiting for 80cm in the center.
  • For each well:
    • Airlift pumping for 6
    • Constant pumping with a pump with throughput of 50—150 m3/h to determine filtration parameters and projected debit of the well.
    • Sampling water for analysis.
    • Composing charts of for the recovery of the static water level.
  • Installing a locked plug on the PVC pipe.
  • Creating a well passport with a geological description of the cut and results of the well debit calculation as well as recommendations in regards to the depth of installation and capacity of the pump.

Creating reports

Upon the completion of all preparations and field works, a short report is created. The report includes:

  • A short description of the sequence and methodology of factually conducted works.
  • Results of pumping and maximum debit for each water intake well.
  • Columns with the actual construction of the wells, descriptions of geological cuts and recommendations in regards to the depth of installation and capacity of the pump.
  • Catalogs of all drilled wells with coordinates of the mouths of the wells based on GPS data and with all important parameters of wells (depth, construction, debit, recommended depth of installation and capacity of the pump).
  • Topographic map with the scale 1:50000 for the whole territory on which works were conducted with locations of all areas of exploratory operations and drilling spots.
  • Schematics of locations of all exploratory and water intake wells for each area in a slightly larger scale.

2. Drilling wells for water intake for organizations and private clients

Drilling wells for water intake for organizations and private clients includes:

  • Inspection of the area, surveillance of the hydrogeological situation, determining whether a hydrogeological complex can be deployed.
  • Deployment of the hydrogeological complex.
  • Auger drilling along the weathering crust and alluvial deposits.
  • Installing temporary pipes.
  • Pneumatic drilling of holes with diameters of 140—165mm through bedrock towards the aquifer at the depth of 60 — 110m.
  • Removing temporary pipes.
  • Installing PVC pipes and filters with the 125—140mm diameter.
  • Airlift pumping until clear water is extracted.
  • Pumping with the submersible electric pump for 10 hours.
  • Building a superstruction (at the request of the client).
  • Creating a well passport.