If a borewell is not Flushed,can the pump get jammed while lowering?

Question

Our borewell was 48 mtrs deep and while lowering the pump would not go in neither come out(12mtrs).All effort's failed and the pump is now inside the well(permanently).

Answer 1

it can jam if not flushed

Answer 2

Flushing bentonite/drilling remnants could be a cause for a pump getting jammed. I've never seen this though. Most drillers flush well enough that the only thing left is fine enough to be pumped out by the submersible pump installed.

I have seen pumps get jammed for other reasons:

1) A horizontal shift in a geological layer that causes the borehole to be pinched off.

2) A steel borehole casing that has corroded and allowed the borehole to collapse up to/near the waterline.

3) Old pumps, when being removed, will fall off of the pipe they were secured to. Sometimes they will jam sidways at a joint in the borehole casing. This applies to anything that may have fallen in when removing the old pump. It is not uncommon to find old wire, pipe, pumps down a borehole. These can be removed (easily sometimes) by simply welding up a barbed 'harpoon' that can be attached to GI pipe and lowered, twisted around until a firm grip is established, then removed.

4) Roots can grow in through the perforations where they start. I do not know how deep your perforations are, but roots go for water and if in the vicinity of a borehole/well they will sometimes go in through the casing perfs and can clog the borehole.

5) When installing the new submersible pump too much slack was given to the wire. the wire drooped below the pump, caught on something and balled up.

My suggestions.

1) If possible obtain a borehole camera to get a really good picture of what's down there. Be careful not to get it tangled up or you've got an expensive problem on your hands.

2)If you've used GI pipe you should be able to put several thousand KG of upward thrust on the pipe without fear of damage to something other than the wire (if that is what has become entangled)

3) The cost of drilling a new borehole, installing proper casing and a pump should be weighed against the cost to maybe??? repair your current borehole. Do you have someone with experience knowledge of the current borehole you are working on?


I hope this is helpul! I wish you the best in your endeavor to get your borehole productive.

Answer 3

You are talking about sub- mergible pump in a borewell.(1) The diameter of bore hole is LESSER than the dia. of pump.(2) Fill water into bore &Force comressed air to remove the slush till clear water comes,then pull out pump.(3)May be PVC pipe is not inserted properly into the bore. --My answer is not boring because I am a Mechanical Engineer

Answer 4

U have to try and pull the pump out or u have to bore again.