My fellow Nairalanders. I've been confused about digging a Borehole. Somebody was telling me that a full casing is better than half casing and I don't understand the terminology.

Can somebody explain the best way to dig a Borehole and what is the present cost per metre now? I will be reading all the comments.

Thanks in anticipation.

Where exactly are you digging this borehole because location matters as regard to Casing.

Firstly, casing is the term used during borehole drilling were pipes (of about 4inch diameter and more) are placed inside the drilled hole to prevent the walls of the hole from caving in.

And so, the location of the borehole determines whether or not a hole need casing. In Nigeria, rocky and consolidated areas like the North and East don't require much casing. In most cases, you don't even need casing because you are drilling through rocks and consolidated materials.

Whereas, the southern part of Nigeria require casing to prevent the borehole walls from caving in because the earth there is loose. So,for this part of the country, you need complete/full casing of the borehole.

Note: If the wall of the borehole cave in, the hole is damaged and your submersible pump (pump in the hole) is lost forever. You will have to drill another hole.

I hope this helps.

josh4croft:
Where exactly are you digging this borehole because location matters as regard to Casing.

Firstly, casing is the term used during borehole drilling were pipes (of about 4inch diameter and more) are placed inside the drilled hole to prevent the walls of the hole from caving in.

And so, the location of the borehole determines whether or not a hole need casing. In Nigeria, rocky and consolidated areas like the North and East don't require much casing. In most cases, you don't even need casing because you are drilling through rocks and consolidated materials.

Whereas, the southern part of Nigeria require casing to prevent the borehole walls from caving in because the earth there is loose. So,for this part of the country, you need complete/full casing of the borehole.

Note: If the wall of the borehole cave in, the hole is damaged and your submersible pump (pump in the hole) is lost forever. You will have to drill another hole.

I hope this helps.

It's the North, Abuja to be precise. And from your explanation, I think casing is very important and should be considered even if the water is coming from a rocky area.

No, you didn't get my explanation. Abuja is part of the north and so, doesn't require full casing.

Like I stated earlier, the earth in the North ( Abuja inclusive) is rocky/consolidated (solid) and so may not require full casing except for a very deep hole with length over 100meters ideally. I have no experience in borehole drilling in the North, however I am talking as a Geologist with experiences.

Note that, full casing would be for the entire trajectory (top to bottom) of the borehole while partial casing would be for the part of the hole that is considered loosed by the drilling engineers.

Remember that your question was about half/full casing...

josh4croft:
No, you didn't get my explanation. Abuja is part of the north and so, doesn't require full casing.

Like I stated earlier, the earth in the North ( Abuja inclusive) is rocky/consolidated (solid) and so may not require full casing except for a very deep hole with length over 100meters ideally. I have no experience in borehole drilling in the North, however I am talking as a Geologist with experiences.

Note that, full casing would be for the entire trajectory (top to bottom) of the borehole while partial casing would be for the part of the hole that is considered loosed by the drilling engineers.

The explanation is clearer now. Appreciate

josh4croft:
Remember that your question was about half/full casing...

Hello sir,

You seem knowledgeable on these matters.

Please help contribute to my topic below. I need suggestions.

Thanks.

https://www.nairaland.com/7975402/new-borehole-pumps-out-dirty#128026741