Determining waterflood effectiveness ///

Water injection as a means of secondary recovery and as a technique for pressure maintenance to energize the reservoir is one of the oldest techniques used in the petroleum industry. Over the years there has been tremendous advancement in this field, and in waterflood design, development, and surveillance. Of these, the design and development of the waterflood usually attracts the most attention. However, surveillance is a relatively less rigorously followed practice, although its importance in the waterflood's success cannot be understated. There are many easy-to-use techniques for monitoring a water injection/ waterflood project, e.g. Hall plot, WOR, GOR plots, voidage replacement ratio, etc. Voidage Replacement (VR) and Voidage Replacement Ratio (VRR) derive from an analogy with liquid tanks, Fig 1. Liquid production from a well creates a void in the reservoir and water injection into the reservoir fills the void. This article explains the technique's effectiveness and describes some of its pitfalls.

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