Abstract
Abstract Conventional minifrac analysis assumes the presence of a homogeneous formation and an ideal formation/fluid system. These conditions usually lead to a leakoff rate that is inversely proportional to (time)1/2. This paper shows that in heterogeneous formations, such as naturally fractured formations, leakoff rate can be better modeled as being inversely proportional to (time) where n is named l·eakof f exponent. It is also theorized that many formation/fluid systems will exhibit a leakoff exponent different from 0.5. This paper presents methods for determining this l·eakoff exponent. It also considers the effect of spurt loss on minifrac analysis and suggests a method for determining same. In addition, the paper discusses determination of closure pressure and time.
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