摘要：Fish and fishing are main causes of drilling NPT. Finding an optimum time for fishing or to quit the operation is extremely difficult since fishing is not an exact science. From all the cases considered as fish in the borehole, stuck pipe is statistically speaking the most severe case. It means that dealing with sticking scenarios is more difficult operationally and much more time consuming compared with the other types of fishes. In this paper it was attempted to introduce a function which has the ability to present a chance of releasing stuck pipes for Iranian southwestern fields. Validation of this model is examined by several case studies; therefore a combined theoretical-experimental approach is used in this research. Also a solution is offered to determine success rate of fishing operations. This information helps the decision makers to figure out when to quit fishing and start sidetracking. Importance of the research is in reducing drilling NPT and undesired costs
关键词：Fishing; NPT; Pipe sticking; Formation structure; fishing time; Side tracking
