Soil Friction

need to know soil type, size, weight and total length of pipe would help

total wt. of pipe is 192.90 tons, type of soil is medium hard, but this hole if full of bentonite (drilling fluid). is it posible to compute the total pulling force? do i need to apply a drag force for this? acceleration of pulling is about 4-8m/min.

Hello ajan,

If you already have a hole, even if it is filled with Bentonite, how much pipe do you need to put through this hole? Are we talking a 100 metres or several kilometres?

How big is your pipe and what is it, copper, steel, cast, plastic? And what size? Is the pipe you want to get through smaller than the original hole?

4-8 metres a minute is not bad, but it does depend how much you have to get through the hole?

hi baby,

the dia. of hole is around 42", the pipe is carbon steel 34" pipe, the total length is 644m.

thanks,

There is a nice reference manual published by the Horizontal Direction Drilling Consortium that provides all kinds of info. It has some recommendations on rig sizing (ie available pull back) vs size and length of pipe to be pulled. Their bookstore is at http://www.nastt.org/store/good_practices.html.

Thanks, i will try to have one,