Oil and gas drilling; Drilling for oil and gas; Extraction of oil and gas; Technical consulting related to the installation and design of oil and gas equipment, control systems, and machinery; remedial services for oil and gas production, namely, refracturing and hydraulic fracturing of subsurface geologic formations; consulting services in the fields of oil and gas well drilling; oil and gas services associated with refracturing; consultation services associated with refracturing wellbores; ...