Maximum Efficient Rate [MER] Law and Legal Definition

Maximum Efficient Rate (MER) means the maximum sustainable daily oil or gas withdrawal rate from a reservoir which will permit economic development and depletion of that reservoir without detriment to ultimate recovery. The MER is the maximum rate at which oil or gas can be produced without damaging the reservoirs natural energy. If oil is extracted from a reservoir at a rate greater than the maximum efficient rate of recovery, then the natural pressure of the reservoir will decline resulting in a decrease in the amount of oil ultimately recoverable.