INVESTIGATION OF DRILLING OPERATION LIMITATION BY STRESS ANALYSIS AND FAILURE CRITERIA METHODS

Abstract

Introducing the stresses concentration and the instability phenomena that could exceed the formation strength causing hole failure. The study starts by collecting data and evaluating the daily field information in contingency with other running operations. The failure envelope stress, mud pressure and mud weight calculation were done Using Mohr and Ducker Prager Failure Criteria model to prevent hole collapse in Neem field. The proposed parameters and stress distribution treated as a base for investigating the drilling limitations: how to overcome fracturing, sticking, etc.; getting the optimum mud to be used in the NEEM field. Meanwhile investigating the casing seat points and using for the better bit selection. This will optimize the cost benefits and the whole operation economical risk in NEEM field.