The wide spread application of fluid injection processes apparent in today'soil production picture confirms the confidence of the oil producer in these processes as a means of increasing value of oil properties. Since the producer is motivated by his interest in conservation and profit to install these types of operations, it is reasonable to presume that the average oil operator recognizes the engineer's ability to accurately predict their outcome and is willing to invest substantial capital in a field project in order to accomplish the predicted gains. Not only is the industry's confidence reflected by the capital invested in injection projects, but also by the substantial efforts put forth in unitization and other negotiations among operators in order to facilitate this type of operation. In transactions involving the purchase or sale of oil properties, it is becoming increasingly common to find that the potential value of properties susceptible to these operations is taken into account in arriving at the total consideration paid or received.

Early applications of fluid injection were restricted to shallow, depleted oil reservoirs and were, in a true sense, secondary recovery operations. The primary reserves of the field had been recovered and a stripper stage of production existed at the outset of the fluid injection. Because of the age of the fields, little or no data associated with the modern science of petroleum engineering were available on the reservoirs to be treated. Lack of confidence in fluid injection potentialities on the part of the operators made them reluctant to spend money to obtain data for proper engineering valuation.

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