Hydraulic ram pumps and Sling Pumps

Appendix I: Methods for Grouting Casing●wiper plug .... it will set around the drill pipe and make it apermanent installation!After 1-2 hours, slowly start to pull-up of the drill pipe. If drillingmud ponded around the top of the borehole starts to drain backdown into the annulus, then cement is leaking back up the casing.Leave the drill pipe in the hole for another 15-30 minutes and tryremoving it again. Remember... some leakage is better thencementing your drill pipe into the casing!Cement "Plastic Bag Plug" MethodSometimes a borehole is drilled into poor quality water and it isdetermined that the best course of action is to backfill the lower portionof the hole and set the well screen at a higher elevation where betterquality water is expected. When a wooden drive shoe is used at thebottom of a casing string, it is desirable to place a 30 - 61 cm (1 - 2 ft)cement plug in the bottom of the well to ensure that sediment cannotenter the well when the plug rots out. Both these procedures nvolve allor some of the following steps:●●●●●●Backfill the hole with cuttings until you are 61 cm (2 ft) below thedesired completion depth of the borehole where you want thebottom of the screen to be.Mix-up 0.4 ft 3 (11 litres) of real thick cement & water mixture (nosand or gravel).Pour the cement into small plastic bags the easily fit down insidethe borehole.Run the drill pipe with a blade bit down the borehole and movethe pipe up and down to chop-up the bags and mix-up the cement.Remove the drill pipe and wait 1 hour for the cement to set.Insert the well screen and casing (with casing bottom plug) downinto the borehole. Suspend the casing 6 inches off the bottom ofthe borehole and then put in the filter pack.http://www.lifewater.ca/Appendix_I.htm (5 of 6) [1/13/2005 12:45:29 PM]