WATER WELL SUPPORT VEHICLE (WWSV) - Continued
Gas (MIG), Tungsten Inert Gas (TIG), and Stick welding applications with an output capacity of 40 to 250 amps
DC TIG/Stick, 40 to 250 amps AC TIG/Stick, and 17/18 volt FCAW/MIG. The WWSV also carries a grouter used
to pump environmentally-safe grout between the outside of the drilled hole and the casing. The grout is pumped
to the required depth, which is determined by Army regulations, and creates a natural seal at the surface of the
drilled hole which protects the aquifer from ground surface contaminant run off. The WWSV also has an on-board
crane used to position various items around on the drill site.
PORTABLE AIR COMPRESSOR (PAC)
The PAC (1,170 cfm/350 psi) (33.13 cmm/24.13 bar) is utilized as an auxiliary air compressor or combined with
the WWDR on-board air compressor. Both air compressors are then functionally tied together through an auxiliary
air compressor connection on the WWDR that directly feeds the WWDR with additional air for air drilling
operations. The combined high pressure air is transferred through the WWDR-mounted air plumbing, through the
tophead drive, and down the inside of the drill rod. This pressurizes a down-hole hammer and bit combination that
reduces the consolidated (rock) formation into fractured cut-up pieces. This volume of air lifts the drilled cuttings
to the surface between the inside diameter of the drilled hole or casing and the outside of the drill rod during
drilling operations. The cuttings are then shoveled away from the drilled hole by the helper. The annular space
between the drilled hole or casing and the 4.5-in. (114.3 mm) drill rod creates up-hole velocity because the air
flow is restricted, forcing the cuttings to the top of the hole.
MUD CLEANING SYSTEM (MCS)
Drilling mud is used to provide hydrostatic pressure to prevent fluids from entering into the well bore. This process
keeps the drill bit cool during drilling, carries out drill cuttings, and limits damage and corrosion to the drilling
assembly. The MCS and its on-board triplex mud pump are operated/utilized for fluid (mud) drilling conditions.
The high pressure and volume of drilling fluid (mud) is pumped from the 1,000 gallon (3,785 L) fluid tank by the
MCS triplex mud pump to the rig mounted plumbing. The mud then travels through the tophead drive and down
the inside of the drill rod that powers a rotating drill bit which cuts the unconsolidated (sand, gravel, soft rock, or a
combination of all listed) formation. The mud then brings the cuttings to the surface through the annular space.
The dirty mud, with drill cuttings suspended within it, is pumped up the annular space. The dirty mud is then
pumped from the portable fluid (mud) pits by the hydraulic powered sand guzzler into the de-sanding system and
over the top of the shaker screens mounted on the MCS. The drilled cuttings are then discarded to the ground
and the clean fluid (mud) is recycled through the 1,000 gallon (3,785 L) MCS tank and back through the triplex
mud pump which is pumping fluid (mud) continually through the WWDR during fluid (mud) drilling operations. The
annular space between the drilled hole or casing and the 4.5-in. (114.3 mm) drill rod creates up-hole velocity
because the drilling fluid (mud) flow is restricted, forcing the cuttings to the top of the hole.
END OF WORK PACKAGE