Hand Bore & Calix Bore

Hand Bore / Manual Drilling : 

Filterpoint Wells, Hand bore wells, Calyx wells and Rotary Wells are diffent types of Tube wells. Filterpoint Wells are done in the costal areas ranging from 10 ft – 40 ft. Hand bore are manually drilled tube well which may range from 20 – 200 ft. in depth and 4”- 8” in diameter. Most of the hand bore wells need periodical cleaning/Flushing. It is usually done in  salinity/sandya reas. Calyx Wells is a miniature type of Rotary well which is inaccessible to Rotary rigs.  The depth varies from 100-600 ft. and the diameter is from 5”-12”.  


handbore

Hand Bore  / Manual Drilling



Rotary / Calix Drilling :

Calyx drills are used in sedimentary and clayey formation occurring mostly in river Alluvium or river banks for making a large diameter tube wells with gravel /graded pebble packing. In the direct-mud rotary drilling method, the borehole is advanced by rapid rotation of a drill bit mounted on the end of the drill rods. The bit cuts and breaks the material at the bottom of the hole into small pieces (cuttings). The cuttings are removed by pumping drilling fluid (water or water mixed with a fluid enhancer) down through the drill rods and bit and up the annulus between the borehole and the drill rods. The drilling fluid also serves to cool the drill bit and stabilize the borehole wall, to prevent the flow of fluids between the borehole and surrounding earth materials, and to reduce cross-contamination between aquifers.

Despite these obstacles, direct-mud rotary drilling can be the best alternative, especially for deep wells or wells completed into well-lithified rocks. When direct-mud rotary methods are used, hole diameters should be 3 inches to 5 inches larger than the outer diameter of the well casings to allow effective placement of filter and sealing materials.

4.5 borewell 

4.5 borewell

                Rotary / Caliyx Drilling             Caliyx Drilling Front View

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