How to drill a water well yourself using a power drill.
The method demonstrated in this video is called rotary jetting, it is suitable for sand and clay but not for hard rock formations.
Technical drawings of the 'rotary swivel' can be found as publication on our website:
www.wot.utwente.nl/en/knowled...
Or you can use this direct PDF link:
www.wot.utwente.nl/publicatio...
If you have any questions please don't hesitate to leave a comment below or contact us via our website: www.wot.utwente.nl/en/
We also have a lot of information on other interesting technology on water supply, wind energy and a lot more. So check it out if you are interested.
Technical drawings of the swivel are published on our website (link in description). If you want to build this setup yourself you can use these drawings. If things are unclear, you can contact us via our website. If everything is clear and you managed to make your own setup, well done! Please consider sharing this with us as well, we really like to get some feedback and insight in whether the setup is used and how and where etc..
If you want some pointers feel free to look at some of my designs . I built one of these years ago . Keep trying, widen your pipe . Your swivel i had some issues with debris getting stuck in it i had to widen out the holes and space them further .Keep up the good work. If you want to make them even cheaper you dont even need a circulation pump you can hook a garden hose or 2 to it & drill with fresh water although you just have to go extremely slow when you hit watersand this way it dont dig to quick & loose pipe. Also that design is old . I am in the process of making one that doesn't require a hand drill simply water . I can send you some of those designs also.
I can't wait to see these drawings thank you
I need this video in Spanish
@@stinkyvonfishstix4196 The drawings of the swivel have just been published
@wot I reccomended pinning ur comments on ur videos to make it easier for others to see if the comment section become too big
Pretty slick . I love watching people do considerably tough to complete tasks with intelligently designed equipment that most people would say couldn't be done . My favorite quote " Those who say it can't be done should not stand in the way of those who are doing it." Good job my friend
I thought you hated nerds and geeks
Time to meet your average dutch person!
In line with your quote.... those who say they cannot do a thing and those who say they can, BOTH are usually correct.
This really is one of the best KZhead videos I've ever watched. Kudos.
thats a great quote to live by my friend :)
I have experience as a well site geologist and operations geologist in the oil and gas industry. You basically present all the basics in drilling, mud logging, and muf fluids engineering. Great video and thank you for doing it! I would want to see if there are any other videos regarding wind or solar powered pumping for homesteads. All the best!
I am a Petroleum Engineer I was thinking EXACTLY the same!
He still does not show blow out preventing.
@@alexlo7708 Blow out prevention isn't a concern for water well drillers as subterranean water isn't under pressure.
@@DominicNJ73 If anything the opposite is the problem lol
ฉันทึ่งในการเจาะ ฉันเพียงต้องการความลึกแค่8-11 เมตร(พท ของฉันมีแค่ดืนดานที่ขวางกั้นน้ำใต้ดิน เพื่อการเกษตร มีแค่สว่าน เครื่องดูดน้ำ ก็เจาะได้ ทึ่งมากๆ ขอบคุณ ที่ได้เห็น อุปกรณ์ที่คุณคิด ขอบคุณนักขุดเจาะน้ำมันครับ
Brother, you are a rockstar! Ive been trying to think of a way to drill a well cheaply for over 2 years now and you just educated me for free. I am thankful for you. I will keep my eyes open for anything you put out. My name is Wade and I live in Florida.
wade tell me how it goes im curious i jest spent 3k on my well.
I've sold my rigs to guys in Florida before . Florida's easy digging .
@@thhillbillyinventor105 you think between the clay and limestone?
@@gabriellencarnacion3310 yeah much easier than Texas I haven't found anything to bust through that hard rock that's cheap yet .Florida usually is sandy clay or sand . The carbite bits I use usually do the trick through clay .
@@thhillbillyinventor105 I'm very surprised by that. man. im going to have to build that then
This is the cutest single drill rig I've seen by far. Really cool how you have covered all the bases of drilling on a smaller scale.
Wow! This is the best DIY well drilling rig I've seen on youtube so far.
Also the best Makita ad lol
I've seen worse built by "professionals drillers".
Try drilling a well in the desert Southwest with this and then get back to us! 🤣🤣🤣
i worked on an oil rig as a support worker for years never really paying attention to what was happening just doing my part and letting the drill workers do their part. This explains everything to me in a way that everything just came together for me. you just blew my mind.
I just realised this is why the drilling fluid is called liquid mud
Would this be a case of Not Seeing The Forest for The Trees 🤔, I have a Friend that when he's working on a project he blocks everything else going on around him . At one point we had worked at a Company that did Heavy Equipment Repair, He was office accountant an I was Shop Foreman . His Office was in "The Palace" as we called it , The Shop was a fare distance on the property. Every interaction with him was done on the phone , fax , other paperwork. One day he came down to Shop as I was in the processing stage of accident damage on one of our rentals , I looked up from a meeting with one staff when I saw him standing in front of office windows hands on his hips just looking around . I excused myself to approach him , Saying John how can I help you ? His reply was ok I get it now, Get what John ??. He goes so this is what REALLY runs The Company. I took pause , looked at John an stated yes this is what pays your wages . 🤔🤣
@@paulrooster2108 I think I was overcomplicating it in my mind and to see a small version like that simplified it
@@selfsufficientgardenmedic I love it when that moment occurs an things click , I get that angel singing with harp music in the background, the warm soft glow of the morning sun rising it's spectacular !! HAPPY NEW YEAR Garden Medic
@@paulrooster2108 Having worked in both the office and the field for a VERY large corporation this hits home. A lot of the people who never did field work had no idea what we really did. To them it was all paperwork, phone calls and meetings. Ya, they directed the company, but they had never even seen the work. As more and more of those types filtered in, the company slowly went to hell. More focused on stock prices than running the company. 25% decline in revenue over the last 10 years but the stock price is up! Idiots.
I have no need to drill for a water well but I watched your video completely because it was very informative and it looks like you know what you’re talking about. You’re a smart man and make things work with what you have. Good job !!
I don't think I've ever lived in a place where the ground isn't packed with rocks.
Florida has hardly any rocks
I came here to say the same thing. Australian soil is baked harder than European soil obviously. My hand drill would have a motor burn out in the first 500mm
Even in the UK if you dig down even 2ft all I ever hit is rocks, or maybe I am just unlucky and always dig on crap land. 😅
My first thought, too. You hit a big rock, then what? Have you designed a tool to extract that out as well and continue drilling?
Yup. As a matter of fact, I'm from Calgary and we have tons of moraine and drumlins. So, usually more rock than ground!
Lazy and and smart are two different things. you did it the smart way. if you were lazy, you'd have cut 1/4 the cuts and probably never did this project. Thanks for the great demonstration, although I don't plan on using this knowledge right away, you're one of the better videos I've seen on the subject, without all the fluff that usually goes with them. cheers!
I have been watching DIY well drilling videos over the last two days (doing some research to do our own one), and this is hands down the best one I've watched thus far. Well done dude, well done.
Polyvinyl chloride (PVC or vinyl) is the most toxic plastic for our health and the environment. PEX is safer but still leeches chemicals into water. Copper is good if the ground water is not acidic but big $$$$, Clay pipe is the safest for chemical contaminants but it's hard to install without breaking and professionals usually need to lay it. PVC will contaminate your gardens and ground water pretty badly though, pex is probably the best choice.
We.had ours clasped and we could only get it partly opened with full metal 308 rounds! I need this drill setup so.i can.get ours back open fully!
@@forposterity4031 Or use steel pipes, cheaper than copper and can withstand some amounts of low pH level (just less than 7). It doesn't contaminate the soil and the water much, but rusting can be a problem.
How deep do I have to drill to access water
@@luqmaanparakh8744Where I live, the comunity has a geological map with the local water table. Also, often farmers will know this, so maybe ask a local farmer.
I am not an engineer of any kind ... just a simple man always wanting to go off the grid. Drilling a well has always been a dream. You have made this video in a way that anyone can understand and see how it works. Well done man.
Wow. Bore hole drilling is not affordable where I come from and its a specialist work of course. Your ingenious idea and design using everyday tools and materials just opened up the possibility for our rural people to drill bore holes and have access to clean water. Your video explains the process very well for the layman too. Well done and thank you for sharing 👍👍👍👍👍👍
Well done, you have captured the fine points of drilling very well. I have drilled many dozens of sample bores to over 700ft, these techniques and devices are exactly what we use, all but on a heavier scale. We use bentonite in the mud to clear the cuttings and use two pits to help remove the cuttings from the mud. Stop with the bentonite for the last 2 or 3 meters, change the drilling mud out for water, so as to not plug the wall of the bore. Risky, the bore may collapse, but worth it for yield. Only used the gell a couple of times, works well and maybe doesn't clog the bore as much as bentonite. Nice vid.
Well done...well done...it's just a pun
@@CoinsAndCapsaicin dang, an accidental pun. Well spotted
How do you know how deep to go, asking for a friend
@@quinnjones2886 There is no "deep enuf" number in water bores. As the author noted, ask how deep the nearby wells are and base your well on that. The water bearing strata are a contour, much like the surface contour, but not necessarily an exact match. Remember about 3/4 of the water in a river is flowing under the ground under the river. Look at the lay of the land, read the contours, look at where the water flows on the surface, imagine where the underground steam would be. Ask the neighbours.
You've never drilled a well till you've fell in the hole, LOL. That's how my work day started, digging 2 3ft x 3ft holes. We went to using a mud pan saved a lot of work
This was such an awesome overview of the whole process in just 15 minutes! I really liked the jigs you made to hold the drill rods and pipes as you worked on the next piece. Genius! 👌
thank you for your wonderful and highly useful instructions on this emas based drilling. I will try the method and pray that God reward you for your sense of service and your spiritual and enlightened spirit.
My vote for BEST DIY WATER WELL DRILLING ON KZhead!
Reminds me of my former life in the Alberta oilfield. All the elements are there: rigging the derrick (a topdrive rig, very modern), digging the rathole, running in, adding a single, using the slips, tripping the bit, managing the mud, running surface casing, cementing off. Great stuff. The downside would be hitting a shallow aquifer that is pressured up and having a blowout!
lmao I was thinking the same thing
That would be a winner KZhead video though that would pay for itself!
hey! Another Alberta Rig Pig :)
What are the 7 signs of a kick?
@@jmorton3462 an increase in flow rate, pit volume increase, if your well is flowing when you aren't pumping, if you aren't getting proper fills when you trip, cut string weight and mud weight, and one more that I can't think of off the top of my head since it's been about a decade since I worked in the field.
The only DIY video you need to watch for drilling your own well. So very practical and too the point. I would give it 2 thumbs up but KZhead only has 1 hand.
That was fascinating. I’m on a drilling rig at the moment about to set casing at 12,300’, and your set up is much like our set up. Just a little smaller. Now I want to try and drill my own water well at home using your technique. I may try to utilize s screen to keep the cuttings out of the mud pit though.
Top job! My neighbor asked me, yesterday, about drilling a well in his garden. I thought that there might be a way to use hydraulic pressure, as I have previously used to create channels for conduit under a concrete slab. So, KZhead was my first stop. A simple (and lucky) search yielded this video. I am very impressed with the elegance of this method and offer my highest praise to "WOT!" This technique will be perfect for the geology we need to drill. The project lands high on my to-do list. Thanks for the great video!
Thank you for a brilliant video and for sharing, you have taken a very heavy industrial process and reduced it down to its basic components but at the same time making it simple and efficient, you have put a lot of thought into this, congratulations.
That bike brake trigger system for some reason warms my heart. Great video!
This is the coolest drill rig I’ve seen for a diy/homesteader or even shallow test well drilling. I’m a hydrogeologist in Canada!
Awesome job! I love all your custom made, cobbled together tools that are perfect for the job. The tripod frame to save you from fatigue, the drill rig with the bike brake throttle, the jig that holds and locks in shafts as you add a new segment… all very well thought out! I sure hope you use that for multiple wells. Liked, Subscribed w/bells and all 🙂
So far this is the best DIY drilling ring I've ever seen.
This video was very well done, thank you and greetings from North Michigan USA.
Great job of explaining and showing how to do it. This guy is really Smart! I am very impressed. Those parts he's using, he made them! Very cool!
Very well thought out and professionally executed! Nicely done!
I have drilled several (many) water wells in Holland. Mostly in sand, clay, peat layered soils. Water from peat layered soils has a brown colour, is a bit smelly and it may contain salt and other pollution depending on geography. If I found peat while drilling, I always drilled 3-4 mtr deeper into the sand to get clean water. Isolate the peat from the sand with a rather long clay plug to avoid peaty water sucking into the filter pipe.
How do you create the long clay plug? I assume you mean the contamination because one soil level has been punched through when drilling and the water would mix through the drill hole opening.
@@ssa7843 I think they mean like in the video when they insert clay into the pipe over the sand. Fill up sand in the good layer, then fill up clay pellets in the undesirable layer. But you have to drill to depth first. The casing isolates the good water on the way up.
At what depths would you find the water table, and did it vary a lot between different parts of the country?
Hes the driller the floor hand, working pits and the roustabout getting the next joint ready...Respect bud!
You put a lot of effort into this presentation. Those are the basic skills that people need to learn very soon. Thank you for sharing.
Something I've seen somewhere else is that they had 2 ponds for settlement the first like you have the second connect to the first like you did with the hole, have the sump pump in the second hole so the stuff coming up the hole has a chance to settle in the first pond, hopefully giving you cleaner water in the second
Indeed a sumppump and 2 larger settling holes is a good idea
When my deep (92m) well was drilled (by a well drilling company), the 20cm diameter drill bit made only a one-half turn in the grass sod, and clunked to a stop by solid bedrock within 3cm of surface. It was then rock all the way down, with intermittent layers of gravel. End result was 302 feet (92m) and 10 gpm (45 L/minute). Pump has been down there for 30 years so far, never a problem. In spite of pump controller in basement twice being exploded by lightning. Pump still going...
I imagine that kind of well couldn’t be drilled with a simple DIY drill like this.
Deep water, bet nice and cold eh
@@daleval2182 deeper you go warmer it gets!
Its a wonder you dont have a lava well 😂
That's a very nice well you have. The many layers of rocks have a lot of running underground streams between them.
Now I want to drill well in my back yard. Didn't expect to find my day going in this direction!
Great use of knowledge and intelligence. I would love to use the same method thanks for adding value to the world. We need people like you to live forever.
This is one of the most awesome DIY clips I've seen on bore/spear pumps! Thanks heaps for posting this to KZhead 😎
Seems like a great tool to help countries with no or poor water access. Some fairly minimal tools could be brought in to create a village well, alternately, provide a kit and some spare parts and initial instructions and let them drill well after well on their own.
Im not sure its that easy finding water deep underground without the right technology in places so dry either... im not 100% sure but know some places still have todo test holes 100s of times
Yup, they could sell the drill and pipe and pay a coyote to smuggle them to Sweden.
Bill Gates don’t want that.
You can buy these little drill units readiLy available for last 50 years. No one puts it on KZhead.
This was absolutey fascinating to me. When I retire, I am going to build one. Thanks for posting !
You are a credit to the human race. Thank you sir.
No work is too hard, when you enjoy what you are doing. Great stuff, thanks.
Good job! I have been involved in drilling several shallow wells down 15 to 20 feet where we augured by hand down until the ground water made the hole cave in, and then drove a sand point with stainless steel mesh through a couple of hard-to-drive layers and ended up stopping when it resisted further driving. Wound up with 6 gallons per minute output from a hand pump. Jetting looks a lot easier!
You surprised me with a one man bore well demo! Great work 👍🏽
Excellent method, easy to use and well explained. Thanks so much for sharing!
Brilliant! In most places you will want to look for coarse sand where you stop drilling.
Please explain with more videos on the handle that you used for drilling and inlet water line in the handle. Thanks.. worth watching 🌞🌞🌞🌞🌞👍👍👍👍👍
i curious about the mechanism of it tooo how no water leaked out? mechanical seal?
I have wanted to drill my own well for many years. I might be too old to do it now but I enjoyed your video. If I had known more about it sooner I might have tried it myself.
I have watched a lot of hand Wells drilled on KZhead all with titles that elude towards success only to be met with complete failure after investing an hour more watching these dry well-digging novices. It was good to see someone actually have success at this. Kudos sir you are Da Man:-)
Fantastic presentation! Simple, to the point, and informative. Five stars from me!
Fascinating and kudos to you from Australia! Unfortunately we have to go a lot deeper to get to the water table and the ground is like rock. Very clever use of tools though and a great video. Thanks.
Use of a hammer drill (kanga ir similar) along with a proper drill head and larger pump could probably overcome this but obviously would still have its limitations
When I lived at the Darling Downs, we had a well that was about 8-10’ to water, a bore on another part of the property that was maybe 14’ deep. Good flow too, it could continuously pump 1000gph with little drop. The water was so close to the surface, there were green patches of grass that stayed fresh, no matter how infrequent the rain. There was a spring fed creek on the property that never dried up. Some places are randomly lucky like that. 🤷♂️
I saw a lot of films concerning the well drilling but your method i perfect in every inch! It was a pleasure to see so light and handy details. Thank you!
I'm a simple man, I see a good DIY, I hit subscribe
Excellent! A very simple setup and it worked beautifully, great video
Besides the amazing work you did that was an excellent production as well. You describe the process perfectly and included all the information necessary. This was just an outstanding. Thank you so very much
That was an awesome video!perfectly paced and explained! I feel I could follow these instructions and make a well!great job!
Best solo well drill I've seen on KZhead, incredible work!
Amazing job one thing that would help save a little work depending on how deep you need to get is dig a runoff from the mudpit to get your drill mix cleaner and more stable .
Very interesting ! Well done, thank you for this demonstration
I love those hose fittings, ive never seen those quick style disconnects before, they look like a bigger version of the pneumatic disconnects we have here
You guys should really consider selling those little jigs and stuff as a kit
Muito bom ! Simples pratico e efetivo ! Bom trabalho pessoal ! Do Brasil ! Abraços!
Absolutely love it. I am trying to figure out how to do this where I currently am in Brazil. It might not end up as easy as your process but I would love some thoughts and ideas…again great video
I had no intentions of watching a video on how to drill a well, yet here I am. Thanks for that that was really interesting.
Sorry for commenting a lot. I have only ever read about this, and it was really cool to see. thankyou
I suggest a Solid Steel sleeve 3 or 4" ID to protect the plastic pipe above ground from damage. Insert the steel collar 2' into the ground.
Nice Good tutorial I have dug several wells Your demonstrations is perfect. Note Some additional info on the drill to pile water fitting would have surely help
Hey man, as a side note, I love that wrench. The ratchet/non-return for removing the pipe is damn brilliant too.
You remind me of my Dutch friend called Ivo. This is only possible on Holland due to the soft ground they have. This wouldn't work in England or other places. Thanks for sharing. Its a very clever idea
Thanks for this brilliant idea. I however don't understand the connection between the frame and the rotational drill pipes and would like to get some tutorials on it.
Same. There must be a seal to allow the rotating pipe to retain pressure. Leaving this detail out stops others from replicating this.
I have not seen the kit here but it must work similarly to an oil pump in a car. The water is pumped into a manifold with the rotating pipe head running through it. This has several holes drilled from the center to the rotating edge within the manifold!
A swivel is used this allows one pipe to stay stationary but the other smaller pipe inside to spin freely . The inside pipe has slots in it. You can use a taper seal or a simple rubber seal. Don't overtighten bc friction will lock it up.
You have bigger tube attached to the frame where in one side is hole for water inlet. Inside this bigger tube there are two ball bearings (top and bottom) and also two seal rings to protect the ball bearing. Inside the bearing and seal ring is smaller pipe which have one end welded with shaft to the drill and the other end is to the drill attachment. The smaller pipe have also holes so the water can flow through the frame to drill end.
there are a link to a detailed drawing in the description
Your engineering skills are impressive man!! That thing is awesome.
Thank you for making this video and the template of your design. I wish there were more people like you. 😍Well planned water drain system, I saw another drilling video and the area is totally messed-up with muddy water.
what a creative man....full of logic and a sense of common sense....in-short...>> GENIUS!...thumbs up.
I love it! Brilliant. Leave it to a Dutchman to change what had been a rarefied field of work and turn it into a simple, easy to understand and use process. Congratulations!
I worked on a real water well drill for a few years. Gotta say, this is pretty awesome...
Simple and very straightforward. Excellent demonsration
Pretty good. It is a complex preparation and operation, well explained. It obviously required a lot of ingenuity to solve the technical problems which are clearly shown. Very well done.
Fantastic setup, thank you very much.
Great video and explanation Also I like the clamps and clamps base . Thank Note for viewer : The dill used is 320 W . 450 RPM Keyless Right & Left rotation 1.2 kg
Consider using dc instead of Ac. I too in the begining used a ac drill before i got lit up .
@@thhillbillyinventor105 ... use an insulated drill with a plastic case and your electrical problem is solved. Also put some rubber heater hose on the metal handles as extra protection.
@@rupe53 my other design I don't even touch the drill when I'm drilling other than startup . That was solved and battery capacity also .
Also mine doesn't use metal its design was to be low cost and easily replaced . This is his version of one of my designs just in metal.
@@thhillbillyinventor105 plug in to a GFCI receptacle or add one to your extension cord.
Great job so better than many meat-head videos self styled "experts" You have thought through this and really taught some excellent principles put into practice.
Dude you are a very clever man, thanks for sharing this. I reckon that your ingenuity will save a lot of people a lot of money and may even save a life or two. Absolute legend you are.
You have a crude system of what i designed a few years ago . Good job Like the powered winch . You need to use a little bigger pipe so you can have less restriction. I use 1 inch & go down around 60 ft in sandy clay.
20 metres is a lot I think he went only 5m in the example.
@@zteaxon7787 depends on the soil . The one I designed years ago I did 60 ft and ran out of pipe . All he would need to go deeper is wider pipe and a bigger trash pump.
Brilliant! Having spent several years in the oil patch I am amazed at how similar your system is to drilling for natural gas. BTW if you can find powdered bentonite it can be used for your drilling mud and is safe for your water supply. Bentonite is used in beauty face masks and some people actually mix small amounts of it in water and drink it.
I have found that the bentonite pellets give you time to get them to settle to the sandpack interface before they start swelling. I've had to do a tremmie pipe with a pump if I use the bentonite powder slurry to get it to the sandpack interface, because it begins to swell quickly.
OK I see, you are talking about drilling mud, not the top seal. My apologies, you are correct!
Just like in the oil rig setup. Incredible job man
I love you you are the smart one. Using the drill. I've watched so many of these either you need to be a well buffed man, or you need to have 3 to 5 other person to do what you have done all by yourself, I bend a knee to you, the one who used your brain...thank you..God a love a clever man
To further insure the filter doesn't clog you could dig a second pit with a passage between the first and second. The mud would fill the first pit while the water passed on to the second pit.
That is brilliant! It would be great if you could sell a kit. I myself don't have the skills to build tools like that and I wouldn't hesitate to purchase them already made
There are well drilling kits, machines available. The novelty here is it's made from very easily sourcable and cheap materials.
I worked for a mud company once upon a time in the oil patch and you seem to have that knowledge. I am thinking about driving a shallow well but I know there's a lot of hard clay here so I was looking to see what others have done. Some of the imported drive pipe doesn't hold up through the impacting process so this might be plan B. Thanks for the video.
This is a brilliant technique. Thank you very much for sharing, legendary.
I have to admit your ingenuity is top notch, I absolutely love i! Can you direct me to a site where i can buy the water swivel?
The swivel we made ourself. Technical drawings will soon be published for if you wish to make your own
@@WOT_utwente how much longer on the drawings?
Awesome video! Thank you!
Dude you r hands down a genius thats a way for us not so fortunate people who cant afford thousands of dollars to have clean non contaminated drinking water!!!
Thanks so much for making this video, you are a genius! Great details, descriptions and very helpful.
This is super cool, though one thing I don't get, why didn't you just use a standard pipe cap on the end? Doesn't seem like the geometry of that thing you made is that much better, and with the flare needed for it to slip over the pipe, it isn't much, if any narrower.
Amazing work 👏 wanted to see more the very beginning of and how you made that machine
Very cool. I wish it were suitable for my area, but I'm on limestone with a thin dusting of sand and soil. It just about takes heavy equipment to try to plant a tree here.
Great explanation of how to drill a borehole - Is there information on the drill head and drill sections available? Are they commonly available or were they fabricated also?
Good explanation, i wish u can share how to make those simple small water swivel....also the way to modify the drill Machine......
You can make the swivel under 10 bucks and a Lowes you don't have to use metal for a single hole and that is what most will use it for
Im definitely amazed that that drill is powerful enough. Also that the bore head goes straight and doesn't bend sideways.
You are like angel to me the way you this things marvelous more blessings to your effort
Instead of heating and twisting the end of the pipe, seems it would be easier to just glue a cap on it.
sure selador, but often you have these spare sections of pipe in remote locations. No cap. This sort of demonstration allows people to envisage multiple uses for things.
The method shown also serves to round off the end, so the pipe goes into the borehole easier. A cap is "squared off" and offers more resistance, and may snag on the well wall.
Our caps are rounded. But both responses are very good points.
Use what you have on hand. I did a lot of plastic liner coring and we used the liner and caps for lots of things...