Ключевые слова: art, background, blue, bright, business, color, colorful, contour, derrick, design, drilling, energy, environment, fire, flame, fuel, gas, gasoline, glowing, icon, illustration, industrial, industry, isolated, light, line, linear, lineart, mining, natural, neon, oil, outline, petrol, petroleum, platform, pollution, power, production, pump, refinery, resource, rig, sign, symbol, technology, tower,