The Using of Unconventional Method depending on Well Power in the Mishrif Formation to Release Differential Stuck Pipe, Nahr Umr Oil Field, Southern Iraq

Abstract

One of the main drilling problems is differential stuck pipe that lead to excessive non-productive time. The drill string usually stuck in the filter cake in permeable formations because it becomes immobile as a result of the drill string movement to connect a new pipe, make a trip, handle a drilling issue, etc. because there is a high permeability zone and a pressure difference between formation and filtering. So, without first releasing it by mechanical or chemical processes, the driller is unable to reciprocate or rotate it. Nahr Umr oil field was selected to study the problem of differential stuck pipe occurred while tripping out in the Hartha Formation and procedure steps to formulate the appropriate method to release the stuck string. Used unconventional method to free stuck pipe depend on well power in the Mishrif Formation after the conventional method failed to treat the problem. Then, the results were discussed with estimating stuck pipe depth and the force needed to release the string and comparison between the methods relative to the time and cost. Also, the result can be concluded that the appropriate mud weight is 1.27gm/cc. On the other hand, it was concluded that the unconventional method cheaper than the conventional method but it can be used if the formations contain oil or salt water only.