Drilling Time Statistical Analysis and Benchmarking for Drilled Wells of Zubair Field

Activities of drilling wells are widely continued and increased all over the world either to develop the mature reservoirs or to discover new reserves. The majority of these wells experience numerous issues during drilling operations, resulting in financial losses and wasted time. This is referred to as non-productive time (NPT). Due to these difficulties, all of these concerns present a challenge to not only the drilling engineer or designer but also the company as well. All parties want also to keep the continuous improvement of their operations. Therefore, this paper aims to analyze most of the drilling issues appeared during drilling Zubair wells which are located in the Eastern Iraq. Furthermore, drilling time statistical study is done to differentiate between the various causes of Zubair wells' problems. A rate of penetration (ROP) benchmarking study is also done so as to determine the drilling performance relative to the best well. A comparison is performed to know the best well performance.