Ditch Witch JT1220 Mach 1, Руководство оператора

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Operation Overview - 58
JT1220 Mach 1 Operator’s Manual
Backreaming
CMW
Backreaming
1. Assemble backream string. See page 102.
2. Start drilling unit and adjust throttle.
3. Set drilling fluid flow. Check that fluid flows through all nozzles. See page 116.
4. Remove pipe from bore. See page 103.
5. Remove up to a single column of drill pipe from full box (see page 131) to complete backream.
6. Remove pullback device. See page 105.
Backreaming Tips
• Plan backreaming job before drilling. Plan bore path as straight as possible. Check bend limits of
pullback material. Check that appropriate pullback devices are on hand.
• Keep all bends as gradual as possible.
• Drilling fluid quality is a key factor in backreaming success. Contact your Ditch Witch dealer for
information on testing water, selecting additives, and mixing drilling fluid.
• Backreaming requires more fluid than drilling. Make sure enough fluid is used.
Leaving Jobsite
1. Remove downhole tools. See page 105.
2. Remove anchors. See page 109.
3. Rinse unit and downhole tools. See page 150.
4. Disassemble strike system and disconnect from fluid system. See page 151.
5. Stow tools. See page 151.
6. Load unit onto trailer. See page 81.
Storing Equipment
1. For cold weather storage, antifreeze drilling unit. See page 148.
2. For long-term storage, disconnect battery disconnect switch.