【单选题】The oil pressure in the gas production curve drops significantly, the water production decreases, and the casing pressure does not change significantly. The possible reason is ( )
【判断题】Oil pressure sensors are adopted to indicate if the oil system keeps in the right amount of pressure. Oil pressure is usually sensed or measured directly from the main oil gallery.
【单选题】In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that any leak in the cooler will mean a loss of _____.