This Web site is an educational and outreach service of the Pennsylvania Ground Water Association, Inc.
Learn How To Use the Xs Casing Advancement System
To Air-Rotary Drill Through Caving Overburden
at the PGWA 2015 Summer Field Conference
Friday, June 12, 2015 at the same location as last year west of State College, PA.
By Todd Giddings, Ph.D., P.G., Education Committee Chairman
Each year, for the past thirteen years, the Pennsylvania Ground Water Association has held one-day, totally outdoor, summer field conferences that have had live demonstrations of water-well and geothermal borehole drilling, casing, grouting, development, test pumping, hydrofracturing, and decommissioning.
What will be demonstrated on Friday, June 12, 2015? We are going to demonstrate how to use the Xs Casing-Advancement System to air-rotary drill through caving overburden while simultaneously advancing the steel casing with the drill bit. This will be the fourth method of drilling through caving overburden that we have demonstrated at this site.
The Xs Casing-Advancement System is manufactured by GeoRocFor, Inc. in Quebec, Canada. The Driver Bit and the Crown Bit components of this patented system are shown in blue in the cut-away view below. Four flat faces (two of the flat faces are shown by the two small arrows in the diagram below) on the Driver Bit lock into four flat faces inside the Crown Bit so they act together as a standard air-rotary, down-the-hole hammer drill bit. The Driver Bit extends below the Crown by 3- to 5-inches and drills a pilot hole to guide the direction of the casing. Regular-wall or heavy-wall steel casing can be used, and the casing joints are butt-welded together. The four flat faces on the Driver Bit transfer the direct energy from the down-the-hole hammer into the Crown Bit. The drill cuttings (rock chips) move through two channels on the face and side of the Driver Bit. These two channels serve as flushing airways and carry the cuttings upward between the drill string and the interior casing wall. Once the casing is set to the desired depth, the open hole is advanced by unlocking the Driver Bit and drilling to the desired depth.
This demonstration will be at the same location as the past three years, next to the Home Depot store at the I-99, Route 220, and Route 322 Exit 69, located just west of State College. In 2012 we demonstrated the Schramm GeoCase® case-as-you-drill method of air-rotary drilling through caving overburden, and in 2013 we demonstrated how to convert an air-rotary drill rig so we could mud-rotary drill through the same caving overburden. Last year we demonstrated the Stiff-Foam air-rotary drilling method that used less air volume and created a pseudo-wall-cake to stabilize the borehole wall and minimize caving and collapse. The XS Casing-Advancement method is another case-as-you-drill method and usually guarantees success.
The Gatesburg Formation overburden at this site is a silty and clayey sand material that is notorious for its caving conditions and flowing sand zones. A large commercial geothermal loop field was constructed across the street from this demonstration site by using mud-rotary drilling to keep the geothermal boreholes from caving in before the loops were inserted and then grouted in place. The same caving overburden conditions at this 2015 PGWA Summer Field Conference site will provide a very good challenge for the XS Casing-Advancement System.
Who should attend? Anyone who wants to learn how the XS Casing-Advancement System works, especially air-rotary water-well drilling contractors, geologists, water-supply engineers, hydrogeologists, sanitarians, watershed specialists, water-supply regulators, municipal officials, planning commission members, members of watershed associations, water-well owners, Master Well Owners, and anyone interested in learning another drilling method that can overcome caving-overburden conditions.
Equipment manufacturers and suppliers to the ground-water industry and the geothermal industry should also attend and take advantage of this opportunity to display their products.
There will be a concurrent session in the big tent on “How to make muddy drilling water crystal-clear using a polyacrylamide polymer”. Go to www.pgwa.org to read about this presentation. This presentation will be concurrent with the DOT walk-around inspection of a rig-tender truck by Pennsylvania State Police Motor Carrier Enforcement Officer Supervisor Mitchell Scalia.
Why attend these demonstrations? This Summer Field Conference will demonstrate Xs Casing-Advancement System drilling technology that you may only have read about. By direct observation of this Xs Casing-Advancement System drilling demonstration, you will gain a much better understanding of how it works. As the Xs Casing-Advancement System drilling progresses, it will be explained step-by-step, and there will always be an opportunity for questions. There will also be tabletop displays in the big tent.
Registration is FREE for any employee or member of any federal, state, or local government agency or entity, Master Well Owners, faculty, and students. The PGWA Summer Field Conference Site is at the same location as last year on the northwest side of State College, and a detailed location map with driving directions is available on the PGWA Web site at www.pgwa.org . A listing of nearby hotels, motels, bed-and-breakfasts, and campgrounds is also available.
The registration fee for PGWA members is $25, and the registration fee for non-members is $45. A hot-pork barbeque sandwich lunch is included with all registrations. Parking is available right on the site.
This PGWA Summer Field Conference program will provide 4.5 Professional Development Hours (PDH’s) for licensed Professional Geologists and licensed Professional Engineers. PGWA will provide Certificates of Participation for 4.5 PDH’s upon request to P.G.’s and P.E.’s who attend. Check the Certificate of Participation request box on the registration form.
For hotel, motel, bed-and-breakfast, campground, and local attraction information, click this link.
For a location map with driving directions, click this link.
To print a PAID registration form for the Summer Field Conference and Trade Show, click this link.
The registration deadline is Friday, June 5, 2015!
For a Trade Show exhibitor display table registration form, click this link.
To qualify for a Free Registration, you must be an employee or member of any federal, state, or local government agency or entity, a Master Well Owner, or a teacher or student. Commission and authority members and employees also qualify for a free registration.
To submit a FREE Registration form, click this link. After you fill out your Free Registration form and submit it, you will receive an email confirming your Free Registration to the PGWA Summer Field Conference.
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