Well Servicing - Fracturing, Wireline, Coiled Tubing, and Cementing.  All locations use VHF radios now, and the three licensed frequencies are in every mobile truck radio for convoy travel.  The low power wellsite operations frequencies are specific to each location.  Crews from all over the country are working in Texas' many oilfield locations, so this list may not cover all traffic.  Generally, 154.600 is Channel 1 across the nation, though it's CSQ tone means that interference is frequently problematic.