A [[well log]] run in a production or injection well. Small diameter tools are used so that they can be lowered through tubing. Services and devices include [[continuous flowmeter]], [[packer flowmeter]], [[gradiomanometer]], [[manometer]], [[densimeter]], [[watercutmeter]], thermometer, [[radioactive tracer log|radioactive-tracer logs]], [[temperature log|temperature logs]], calipers, [[casing collar locator]], [[fluid sampler]], [[water entry survey]], etc.