Ключевые слова: beam pumping unit, black gold, china national petroleum, china petroleum, daqing oil field, energy, energy resources, energy sources, headframe, mineral oil, oil derrick, oil field, oil industry, oil pumping unit, oil sucking machine, oil suncking machine, oil well, petrochina, petroleum, petroleum industry, power source, remedial work, source of energy, sunrise, sunset, workover operations, workover treatment,