The Driller
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • CLASSIFIEDS
  • EQUIPMENT
  • SAFETY
  • VIDEOS
  • EDUCATION
  • SOURCEBOOK
  • EVENTS
  • SUBMIT
  • ABOUT
  • SIGN UP
cart
facebook twitter linkedin youtube
  • NEWS
  • Water
  • Geothermal
  • Construction
  • Environmental
  • Mining
  • All Industry News
  • EQUIPMENT
  • Rigs & Heavy Equipment
  • Consumables
  • Pumps
  • Featured Products
  • VIDEOS
  • Newscast
  • Drill Talks
  • Ask Brock
  • Emerging Drillers
  • EDUCATION
  • Drilling Business Insights
  • Reference Desk
  • Sponsored Insights
  • EVENTS
  • Conferences & Demo Days
  • Newscast LIVE
  • SUBMIT
  • Drillers @Work
  • ABOUT
  • Contact
  • Advertise
The Driller
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
The Driller
  • NEWS
    • Water
    • Geothermal
    • Construction
    • Environmental
    • Mining
    • All Industry News
  • CLASSIFIEDS
  • EQUIPMENT
    • Rigs & Heavy Equipment
    • Consumables
    • Pumps
    • Featured Products
  • SAFETY
  • VIDEOS
    • Newscast
    • Drill Talks
    • Ask Brock
    • Emerging Drillers
  • EDUCATION
    • Drilling Business Insights
    • Reference Desk
    • Sponsored Insights
  • SOURCEBOOK
  • EVENTS
    • Conferences & Demo Days
    • Newscast LIVE
  • SUBMIT
    • Drillers @Work
  • ABOUT
    • Contact
    • Advertise
  • SIGN UP
MarketsEquipmentOpinionsWater WellsWorld According to WayneDrill Rigs & Heavy Equipment

Installing Water Wells in Sand Aquifers

By Wayne Nash
porosity and permeability
Fill a jar with marbles, and it has both great porosity and permeability. Add some cement, and it’s still porous but the pores no longer connect. It’s lost its permeability
May 15, 2019

In coastal areas and river bottoms, and most places not in hard rock country, water is often produced from sand. Sand is an excellent aquifer because it has the porosity and permeability to produce huge quantities of water. It also has great filtration properties.

Most sand aquifers started their geological lives as boulders or bedrock. Weathering and erosion breaks the massive rocks to particle size, and wind or water flow moves them to where we find them now. They are usually, eventually covered by layers of impervious clays and the like. The amount of time underground, and the depth and weight of the overburden, compacts the sand. An extreme example would be sandstone. This is just plain sand that has been compressed long enough to pretty much solidify. It can be hard enough to be used for building stone!

On the other end of the scale, we see new, young sands at shallow depths that are almost entirely unconsolidated. They drill so easily that they can often be penetrated without rotation. Just kick in the pump and jet down. These formations can be a headache because they may not be competent enough to hold the borehole. The usual cure is to use a good, competent mud that will build a good wall cake to hold the hole.

In between are the sand aquifers that we see, and which produce the most. Porosity and permeability vary greatly depending on area. It is important to understand those terms. Porosity defines the small spaces between grains of sand. Permeability is how well those small spaces are connected. For instance, if you filled a jar up with marbles, it would have both great porosity and permeability. But if you poured some cement in, the pore spaces would still be there, just not connected to each other.

Over time, the permeability of an aquifer may decrease due to cementation. In hard water areas, calcium, magnesium and other soluble elements may precipitate into the pore spaces, plugging them. This is called cementation. This can be good or bad in the construction of a well. A well-cemented sand is easy to drill, and the hole stays open long enough to install the well. The trick is to produce a sand that is not completely cemented and still has interconnecting pores. Commonly, these sands drill pretty fast, and the bit chatters, or “talks,” to the driller — a pleasant sound, indeed. That’s pay dirt!

In my area, most sands are well-enough cemented to make it possible to make an open-hole well. It sometimes takes a little more development time to remove all the loose sand near the wellbore, but it is cheaper because screens aren’t involved. The decision to screen or not is made on an individual and area-specific basis. This can be a trap. I know some poor-boy drillers who always make open-hole wells in sand because they are cheaper. If the sand is not consolidated or cemented enough, they just develop until the well clears. I’ve seen dump trucks worth of sand on the ground during development. Not really a first class practice.

When a sand aquifer is not consolidated or cemented well enough to “hold the hole,” it is time to consider setting a screen. Screen selection can be a little tricky. Too small, and you can lose efficiency and increase drawdown. Too large a screen, and you risk pumping sand forever. The federal government has a standard for sand, but I don’t go by it much. I prefer zero sand. Look at it this way: Even if the well makes a small, but allowable, amount of sand, if your customer’s wife sits on one grain of sand in the bathtub, you will hear about it. A better way is to collect samples of the sand in question, and use them to select the screen. Most screen companies will sieve and analyze your samples, and suggest a screen slot size. Or you can do like I do, and get a sieve set and do it yourself. 

Different companies and manufacturers use a slightly different formula, but I have found that in most areas, I use a screen that retains about 80 percent of the natural formation. During development, the coarse grains form a filter pack around the screen and allow the fines to be developed out. This is exactly the same as a gravel pack, only natural.
 


For more Wayne Nash columns, visit www.thedriller.com/wayne.

KEYWORDS: water well drilling well drilling

Share This Story

Looking for a reprint of this article?
From high-res PDFs to custom plaques, order your copy today!

Wayne nash 200px
Wayne Nash is a regular contributor to The Driller. He can be reached at rockbit8@hotmail.com.

Recommended Content

JOIN TODAY
to unlock your recommendations.

Already have an account? Sign In

  • geotechnical drilling rig

    6 Onsite Phrases Environmental Drillers Hate

    Here are six phrases that highlight common frustrations...
    Opinions
    By: Jeff Garby
  • Wayne Nash

    Pipe Stuck? Common Causes and Solutions for Drillers

    If you have drilled for any length of time, sooner or...
    Opinions
    By: Wayne Nash
  • submersible pumps, water well pumps

    Selecting and Sizing Submersible Pump Cable

    This article helps pump installers and servicers decide...
    Equipment
    By: Bob Pelikan
You must login or register in order to post a comment.

Report Abusive Comment

Subscribe For Free!
  • eNewsletters
  • Online Registration
  • Subscription Customer Service
  • Manage My Preferences

The Driller Newscast: Coiled Tubing Drilling and the Future of Geothermal

The Driller Newscast: Coiled Tubing Drilling and the Future of Geothermal

The Driller Newscast: 21st Century Drillers | Part 1 DEMAND

The Driller Newscast: 21st Century Drillers | Part 1 DEMAND

The Driller Newscast: New York Geo Talks 2025 Conference with Hands-on Driller Education

The Driller Newscast: New York Geo Talks 2025 Conference with Hands-on Driller Education

The Driller Newscast, Episode 147: Global Geothermal Collaboration at NY-GEO 2025

The Driller Newscast, Episode 147: Global Geothermal Collaboration at NY-GEO 2025

More Videos

Sponsored Content

Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the The Driller audience. All Sponsored Content is supplied by the advertising company and any opinions expressed in this article are those of the author and not necessarily reflect the views of The Driller or its parent company, BNP Media. Interested in participating in our Sponsored Content section? Contact your local rep!

close
  • demo of a DM450 drilling rig during a customer factory visit
    Sponsored byGeoprobe

    Built for You: Smarter Drill Rigs, Stronger Support, Bigger Opportunities

Popular Stories

MainPhotoTwoBrothers.jpg

Two Brothers' Journey Through the Drilling Industry

demo of a DM450 drilling rig during a customer factory visit

Built for You: Smarter Drill Rigs, Stronger Support, Bigger Opportunities

AI and Drought Concerns

AI’s Growing Thirst for Water and Power

The Driller Classifieds

COMPRESSORS

EAST WEST MACHINERY & DRILLING IS BUYING AND SELLING AIR COMPRESSORS, AIR BOOSTERS, AIR ENDS & PARTS
Company: East West Machinery

DRILL RIGS

LOOKING FOR LATE MODEL TOPHEADS & DRILLTECH D25'S
Company: Spikes’s Rig Sales

DRILL RIG PARTS

MEETING DRILLERS NEEDS AROUND THE WORLD
Company: East West Machinery

ELEVATORS

SEMCO INC. PIPE ELEVATORS
Company: Semco Inc.

GROUTERS

GROUTING EQUIPMENT - GROUT PUMPS & GROUT HOSE REELS
Company: Geo-Loop Inc.

PUMP HOISTS

SEMCO INC. - BASIC PUMP HOISTS
Company: Semco Inc.

WELL PACKERS

LANSAS PRODUCTS - INFLATABLE WELL PACKERS
Company: Vanderlans Lansas Products

WELL SCREENS

WELL SCREENS & SLOTTED PIPE
Company: Alloy Screen Works

Products

Water Quality Engineering: Physical / Chemical Treatment Processes

Water Quality Engineering: Physical / Chemical Treatment Processes

By carefully explaining both the underlying theory and the underlying mathematics, this text enables readers to fully grasp the fundamentals of physical and chemical treatment processes for water and wastewater.

See More Products

Subscribe to The Driller Newscast

Related Articles

  • gravel and sand

    Water Wells in Sand, Gravel Depend on Screens

    See More
  • Wayne Nash

    Effects of High Sand Content in Drill Mud

    See More
  • Wayne Nash

    Proper Gravel Pack Can Keep a Well from Pumping Sand

    See More

Related Products

See More Products
  • fracturingwells.jpg

    Fracturing Horizontal Wells

  • M:\General Shared\__AEC Store Katie Z\AEC Store\Images\ND\new site\tunneling-in-rock.gif

    Tunneling in Rock by Drilling and Blasting

  • 1119083621.jpg

    Formulas and Calculations for Drilling Operations, 2nd Edition

See More Products
×

Dig deeper into the drilling and water supply industry!

Build your knowledge with The Driller, covering the people, equipment and technologies across drilling markets.

SIGN UP NOW
  • RESOURCES
    • Advertise
    • Contact Us
    • Directories
    • Store
    • Want More
    • Classifieds
  • SIGN UP TODAY
    • Create Account
    • eNewsletters
    • Customer Service
    • Manage Preferences
  • SERVICES
    • Marketing Services
    • Reprints
    • Market Research
    • List Rental
    • Survey/Respondent Access
  • STAY CONNECTED
    • LinkedIn
    • Facebook
    • YouTube
    • X (Twitter)
  • PRIVACY
    • PRIVACY POLICY
    • TERMS & CONDITIONS
    • DO NOT SELL MY PERSONAL INFORMATION
    • PRIVACY REQUEST
    • ACCESSIBILITY

Copyright ©2025. All Rights Reserved BNP Media.

Design, CMS, Hosting & Web Development :: ePublishing

The Driller
search
cart
facebook twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
The Driller
  • NEWS
    • Water
    • Geothermal
    • Construction
    • Environmental
    • Mining
    • All Industry News
  • CLASSIFIEDS
  • EQUIPMENT
    • Rigs & Heavy Equipment
    • Consumables
    • Pumps
    • Featured Products
  • SAFETY
  • VIDEOS
    • Newscast
    • Drill Talks
    • Ask Brock
    • Emerging Drillers
  • EDUCATION
    • Drilling Business Insights
    • Reference Desk
    • Sponsored Insights
  • SOURCEBOOK
  • EVENTS
    • Conferences & Demo Days
    • Newscast LIVE
  • SUBMIT
    • Drillers @Work
  • ABOUT
    • Contact
    • Advertise
  • SIGN UP