Abstract

ABSTRACT In order to optimize jar placement in a drilling string, the force transmitted to the stuck point when the jars are tripped must be determined. Skeem's1 average force method determines this and can be used to evaluate the effect of using heavy weight drill pipe above the jars instead of drill collars. This paper applies Skeem's method to compare two cases for jar effectiveness: (See Figure 1) Drill Collars (DC) are used above the jarsHeavy Weight Drill Pipe (HWDP) is used above the jars

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