16602Re: [multimachine] Who Has The Multimachine in Africa?
- Dec 21, 2012Hi!I have been researching on the web methods on how to drill and how to make the bits etc.What intrigues me is that in various articles I have read they refer to drilling hundreds if not thousands of feetKeeping in mind they did have have steel casings in 1000 BC what did they do?Regards.Theo.On 22 December 2012 07:49, StoneTool <owly@...> wrote:
Actually cable tool works fine in sand and gravel. You start a piece of casing and the casing follows the drill right down. With a rotary machine in those conditions some seriously heavy mud is required, and it then has to be cased.
In drilling, knowing your geology is probably the most important thing........ Knowing what other people have hit in the area.
A fool repeats the same mistakes again and again.
A wise man learns from his mistakes
A successful man learns from the mistakes of others
On 12/21/2012 05:38 PM, Larry Bentley wrote:Howard is right the cable tool machine can drill just about anything and the EMAS videos on youtube and Vimeo show very basic low tech ways of using homemade tooling to drill water wells. Now in some geology other drilling methods may be better but a cable tool will work, just may not be best. The cable tool or precussion isn't great in sand along coastal areas, but lightweight rotary machines don't drill rock well where a cable tools does fine. Different methods work well in different geology formations.Another good source to look at is http://wellspringafrica.org/ I've got a couple of friends actively involved in drilling water wells in West Africa and East Central Africa but it's a big place so can't tell if they are close enough to call on.His questions of what the local geology is and how deep the wells tend to be are important. I have a friend who drilled in Kenya to 1000' (300 meters) and only got a deep post hole (dry well). When I drilled in Benin, the wells were pretty shallow. And in Uganda and Malawai I've seen some pretty shallow wells that produced very well. So tell us where you are and what the local geology is (rock, sand, clay etc..) and we might can help some more with places to look for plans and methods. I've got plenty of info and hand operated well pumps, but some countries have national chosen to support one type of pump or another so I can't say what is best for you yet. Best pump is one where there is local parts support and folks who know how to fix it. Everything made by man breaks sooner or later, so repair has to be part of the planning.LarryTheo:
There is at least one set of "plans" on the web, as well as countless articles and photos. I cannot imagine that in Africa there are not a number of these sitting around. I would start by reading and researching on the internet. Then searching the country around you for old rigs when you know what you are looking at. Building any rig is an expensive proposition. In this cases you need winches (as on all rigs), clutch assemblies to operate those winches, the derrick itself........ which can even be built from wood as in the old days. You will need mainline cable which is left lay cable (opposite normal) so that it does not tend to unscrew the tools. You will need a drill stem which is a solid shaft about 3" diameter and 16-20 feet long with a female thread on one end ("box") and a male thread on the other ("pin"). You will need a swivel assembly for the top which screws to the top of the drill stem, with a matching thread. It will contain the cable which is inserted through the top, and then through a metal "thimble", flared out and poured full of hot babbitt inside the thimble. The assembly slid together so that the thimble allows the cable to rotate when there is no weight on it during the brief moment when it hits bottom, before the cable snatches it back. And you will need a bit or two. You will also need to have casing drive blocks that clamp to flats on the drill stem, and of course "J wrenches" to break down your "drill string". You will need a baler for bringing muck out of the well, and a fast winch to operate it. You will also want an additional winch to handle casing and such tasks. You will also of course need an engine with and out clutch.
The best thing of course is to find a complete rig, and ultimately it will be the least expensive in all probability. You can of course purchase a rig and tooling overseas. They are easy to install or remove from the truck or whatever they are mounted on. Without the truck and without the derrick a rig would not be a large item to ship. The tools are a very significant acquisition, and left lay cable may not be locally available. Every part of a cable drilling rig could be locally built. If I were in your shoes and had the time and money to build a rig from the ground up, I would probably use left hand thread on my stem and tools so I could use ordinary cable.
It's a big project, and an expensive one............ but not compared to a rotary rig. Start with Google........
P.S. I'm a relative neophyte........ It's best to find someone with far more experience to guide you. Talk to local drillers. You will want to know about ground conditions, formations, depth, and local techniques.
PPS How many wells? How deep? What kind of ground?
On 12/20/2012 10:03 PM, T T wrote:
Hi!I am from Africa and would like to build a cable tool drilling rig.How would i go about it, plans etc.Regards.Theo.
On 21 December 2012 06:35, StoneTool wrote:
May I suggest a cable tool drilling rig..... The cable tool, most commonly the Bucyrus Erie has been in existence far longer than the rotary, and is capable of drilling to great depth. They do not require expensive rotary bits, compressors, mud pumps, etc. The tool string consists of a single drill stem (solid), with a rather large solid bit in a more or less figure 8 shape with a swivel at the top of the drill stem. It is attached to a cable and a rocker assembly lifts and drops the bit. Each time it rotates slightly. A baler on a high speed winch lifts the cuttings out of the hole. A fairly small amount of water is used to create a slurry which can be easily baled out. They will drill in any type of ground with proper technique. They are NOT fast, but are exceedingly inexpensive to operate, and require only one man. One bit will last a lifetime, and is built up with weld between or during drilling. Most drillers have a pair and often spend time welding on one bit while the other is pounding away. The clutch and brake setup can be adjusted so the machine drills merrily away while the operator kicks back between baling cycles. Most water wells in this area were drilled with these machines until recent years, and range from 60' down to 800'. It was not uncommon for a driller to leave a rig on a hole for weeks at a time, spending a day here and a day there working on it. Without the labor of tripping in and tripping out, breaking down a long string of expensive drill stem, it's easy to drill when you have the time. Fuel costs are trivial, and maintenance is minimal.
I recently sold one, and have also partnered in a rotary. The rotary gives the satisfaction of fast results, but at huge cost. Bits at anywhere from $500 up, seldom last very many holes, and I've worn them out before finishing a hole. Hundreds of gallons of fuel to run the rig and the compressor 800 CFM in our case.
The cable tool uses a crankshaft assembly which drives the rocker that pulls down on the cable between the drum and the head of the rig, lifting the tool, and returns dropping it. Head springs or rubber cushions at the top of the mast under the head block are an important detail. It would not be difficult to build one of these from photos and drawings. The derrick is simple, consisting of two pieces of channel iron with cross pieces between, and trussing......... not heavy or complex.
If time is more important than cost....... a rotary is the way to go......... If cost matters, a cable tool can't be beaten. My rig cost less than the price of having a rotary drill one well!! And it will still be drilling wells when that rotary is melted down and part of the latest crop of Japanese cars...;-)
On 12/20/2012 07:25 PM, Pat Delany wrote:How deep are the wells?
From: gachubah <gachubah@...>
Sent: Thursday, December 20, 2012 6:07 AM
Subject: [multimachine] Who Has The Multimachine in Africa?
Just inquiring, who has this machine in Africa and in particular, in Kenya? I am interested in having a simple water drill made for me for my farm in Kenya.
Or, if one is built in the West, what is the cost?
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