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
MarketsOpinionsIndustrial DrillingGeothermalDrilling Fluids Tips

Water, Graphite and Geothermal Grouting (Take 2!)

Make Your Mixes Easier by Pre-Measuring Water, Marking the Grouter

By Todd Tannehill
geothermal mix utilizing graphite

To ensure a proper mix, contractors can weigh out water in a jug and mark it for measuring. Then, once they have the required amount of water in the grouter, they can mark that too.

Source: CETCO Drilling Products

August 20, 2021
✕
Image in modal.

In summer 2020, I wrote an article for The Driller titled “Water and Graphite: A Geothermal Game Changer.” In that article, I discussed the effects on geothermal mixes utilizing graphite vs. sand. Here is an excerpt from that article to refresh the reader’s mind:

Manufacturers of geothermal grouts found out early that graphite is a “big lever” in a geothermal mix. This means that only a small amount of graphite increases the TC value dramatically. The amount of water in the mix directly affects the swing of the graphite lever — that is, the thermal conductivity — in an unexpectedly large way. In a typical graphite-containing mix, increasing the water by 1 gallon will see a reduction of thermal conductivity of up to 15%. That means if you are supposed to be adding 15 gallons of water to your mix and the actual amount is 16-gallons, an expected 1.2 TC value may test at 1.02 TC. Likewise, decreasing water by 1 gallon will send TC values the opposite way. 

The chart with this column shows the effect on TC values as water is added or removed from a mix. The chart assumes a normal mix of 50 pounds of geothermal grout, 24 pounds of graphite flakes and 15 gallons of water — a mix that produces grout with a 1.2 TC value. Note the large TC changes when adjusting the water in the mix by small amounts.

Click the image for greater detail

A small increase of water will not only change the expected thermal conductivity, it will affect the suspension, setup time and permeabilities downhole. Our research and development technicians work hard to get the optimum grout/graphite/water mixture for each TC value range. For this reason, we publish the complete mix, including water amount, in our Technical Data Sheets (TDS) and online Geothermal Calculator results.

Last summer’s article provides three methods for ensuring the proper water amounts in the mix: weighing the water with a scale, using a water meter and hand measuring the water with a measuring cup. In our normal grouting world, we are used to 24-gallon requirements — not so much the 15-17 gallons needed for the new mixes. Checking and marking the grouters is important to ensuring consistent mixes throughout the job.

After that article published, I went into the field on a geothermal job that required 1.9 Btu/hr/ft/F. The contractor did not have a water meter on site but assured me his driller “was very good and would get the water right.” I promptly built a calibration jug. I trusted his driller’s instincts and respected his years of industry experience, but I was curious to see how close he was.

Using 8.34 lbs./gal., the weight of water, I built the pictured water jug in my kitchen weighing each gallon of water needed. The CETCO 1.9 Btu/hr/ft/F mix uses 17 gallons of freshwater per batch. For this mix, I use my jug to add three jugs filled to the 5-gallon mark plus 2 extra gallons (also marked at the bottom of the jug. After I measure this, the grouter is marked for all future batches (one and done).

Check out more drilling fluids tips

When marking up this jug, I had to do my 1-gallon and 2-gallon weight measurements three times. They were not matching up to where the molded jug markings were. When you make your own, I suggest measuring several times to verify. As I wrote, being wrong about the amount of water by even just 1 gallon (either way) can change thermal conductivity up to 15%. Check and mark that old grouter you use. If you buy a new one, recheck and remark it. When working with graphite, the proper amount of water ensures success!

KEYWORDS: drilling fluids management geothermal drilling grouting

Share This Story

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

Todd tannehill 200px
Todd Tannehill is technical sales manager for CETCO Drilling Products, a Mineral Technologies Inc. company.


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...
    Markets
    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...
    Markets
    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: 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: Coiled Tubing Drilling and the Future of Geothermal

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

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

AI and Drought Concerns

AI’s Growing Thirst for Water and Power

demo of a DM450 drilling rig during a customer factory visit

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

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

  • Todd Tannehill

    Water and Graphite: A Geothermal Game Changer

    See More
  • Michael Kleespies

    How Does Graphite Affect Conductivity of Geothermal Wells?

    See More
  • Ask Brock video series

    Looking at a Geothermal Grouting System? Hear Us Out

    See More
×

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