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A Clean Operation

By Scott Ellenbecker
December 1, 2011
Texas company focuses on environmental work.



A water well driller may encounter customers concerned about well contaminants, but nothing like Peterson Drilling & Testing Inc.’s customers. The Amarillo, Texas-based company specializes in drilling environmental wells at contaminated sites.

Sites include petroleum production, refining, distribution, and industrial and commercial sites. All types of contaminants are encountered at different sites. Peterson Drilling serves clients in Texas, New Mexico, Oklahoma and Kansas.

How many drillers would think about putting on latex gloves when handling cuttings? Or capturing the first water and all the cuttings from a 400-foot well? Both are common practices for Peterson’s crew. Not all the time, of course, but when it could mean protecting all the fluids, everything is important. The general rule on all jobs is to “keep it clean,” says drilling superintendent Roy Wedell.

Peterson Drilling operates multiple drills in its environmental drilling business. Most of the work is done with a newer Atlas Copco TH60, but the company also operates a classic model TH60 and auger drills.

Environmental wells for Peterson include recovery wells, injection wells and monitoring wells, but the practice is similar in each case. Peterson’s crew captures all the cuttings, and occasionally the fluids recovered from the well while drilling. It uses roll-off containers or a vacuum truck to capture cuttings that its customers use for various types of testing.

Wells range from 100 feet to 450 feet in depth, with the deepest that Wedell can remember being 540 feet. They generally are 6-inch wells, but can go up to 16 inches in diameter.

The company even owns its own cement-mixing truck to make concrete. Often it’s required to pour a pad around the wellhead to provide a surface seal to protect the well from surface contamination, as well as protect it from physical damage. The cement truck also is used to make cement slurry to provide an annular seal above the bentonite plug. The bentonite plug serves as a buffer between the filter pack and the cement seal.

When backfilling a well, most drillers use various aggregates required for proper water flow. Peterson orders washed silica sand by the pallet that will be used for packing its wells. “The slot size needed on the casing can be 0.01 to 0.02 to keep out natural fines,” explains Wedell. In some instances, larger slot sizes are used, depending on the formation.

The casing is not your normal PVC, either. Because bonding agents like PVC cement contain contaminants that may be detected in the monitoring process, the company uses threaded casing, and no glue is used in the casing connection.

At times, it is necessary to monitor various aquifers within the same boring. “We protect the aquifers from cross-contamination by drilling a large-diameter hole, and cementing the casing in place in the upper aquifer. A smaller-diameter hole then is drilled through the larger casing, and a smaller-diameter well is installed in the lower aquifer. Samples then can be taken from the lower aquifer without cross-contamination,” says Wedell.

The company’s new TH60 works well for Wedell because he says its user-friendly with comfortable controls. “It just makes more sense how things like the winch controls are positioned,” he notes. He also thinks the full-speed hydraulics at idle are a benefit because they save fuel, while allowing full function. The jib’s boom swings and operates faster than his last TH60. He also says maintenance is easier than with his previous rig. “I will let you know in the future, but right now, not having to grease the sheaves because they are sealed is much better,” Wedell notes.

Peterson Drilling & Testing’s vice president, Lee Peterson, is open about sharing his company’s knowledge about environmental well development. “Everything we do is out there; there are no secrets,” he says. The company has become expert at what it does because it has the equipment to get the job done and be successful. 
ND

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Scott Ellenbecker is editor-in-chief of multiple in-house publications for Atlas Copco, and the president of Ellenbecker Communications, an international communications firm specializing in the drilling, mining and construction industries.

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