The purpose of the paper is to present how an integrated solution was designed to turn a challenging 6-in. section into a successful 6-in. production sidetrack in Norway. A threatening casing wear issue caused by the combination of slow progress and localized dogleg was addressed successfully with a complete redesign of the drilling system. A 6-in. pilot section suffered slow progress due to low rate of penetration and tool failures. Significant amount of metal swarf was recovered while drilling. A casing wear log quantified the wear in the 9 7/8-in. casing, and this led to questioning the feasibility of the planned 6-in. production sidetrack. Operator, rig contractor and integrated services provider worked together to find a solution. First, a detailed study of the wear was performed. A wear log was run, and the casing wear was quantified. Casing wear simulations were then calibrated based on wear logs and it appeared feasible to drill the 6-in. sidetrack if a minimum rate of penetration and a maximum number of revolutions were respected. Second, the drilling system was optimized to ensure faster progress. This was done thanks to the learnings from the pilot section. The mud system was changed, and a lower density was used to increase the rate of penetration. The drillbit was optimized based on the limited wear seen in the bits used in the pilot section. As it was more aggressive, the perceived risk of downhole tool failure was mitigated with the use of an anti-stall tool. Finally, to reduce the incremental wear from the sidetrack operation, casing protectors and lubricants were run. Also, the planned drillpipe was changed to a lighter drillpipe to reduce the sideforces. The new system resulted in a successful drilling and section TD was reached ahead of the estimated perfect time. With this paper we provide a detailed example of how a casing wear issue was addressed. The drivers we extract from this case are useful for the planning of future operations, especially in extended-reach wells.
Post-entubation tracheal stenosis(PETS) is observed in patients who are hospitalized in the intensive care unit due to various etiological reasons and who are exposed to prolonged intubation during follow-up as a result of the pressure applied to the tracheal mucosa to cause necrosis or scarring in the trachea. In our study,we aimed to retrospectively evaluate the results of patients who underwent dilatation with rigid bronchoscopy and those whose conditions did not improve despite dilatation and underwent tracheal resection and reconstruction, and compare the with the literature. This study was conducted to retrospectively analyze the data of 20 patients who underwent surgical intervention due to PETS between 2019-2022.The patients were divided into 2 groups according to the Cotton Myer PETS index of the data obtained as a result of measuring the diameter of the stenotic tracheal segment according to bronchoscopic and CT measurements. When the patients were classified according to the post-intubation tracheal stenosis classification described by Cotton Myer,it was seen that 7 patients were Grade 1.10 patients were Grade 2 and 3 patients were Grade 3. Tracheal resection and reconstruction surgery is a difficult procedure and requires surgical experience due to the lack of experienced anesthesia team in every center.For this reason,we recommend sequential bronchoscopic dilatation in patients with comorbidity who are not suitable for tracheal resection and in grade 1 patients. However, we suggest that tracheal resection and reconstruction surgery should be performed after appropriate preoperative preparation in patients with grade 2 and 3 without comorbidity.
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