Full-floating 244.5 mm casing running at Chenghai XX extended reach horizontal well
The Chenghai XX well drilling depth is 3 850 m and horizontal displacement is 3 098 m.The full-floating 244.5 mm intermediate casing running reaches a depth of 3 485 m with a water vertical ratio of 2.58,setting a record for the longest floating segment of 244.5 mm casing among CNPC wells.The running of a 244.5 mm casing in a 311.1 mm wellbore,combined with the high water vertical ratio of the casing program,resulted in significant friction resistance,leading to difficulties during casing running such as insufficient hook load,resistance,and sticking.Research and analysis were conducted on casing running by combining the principles of full-floating casing running,casing running techniques,and engineering support,as well as effect evaluation of on-site implementation and application.It was recommended in the result that,for extended reach horizontal wells with this kind of casing program,full-floating casing running should be ideal.With the above method,casing running can reach the designed depth with sufficient hook-load,significantly reducing lateral pressure during installation and the risk of casing sticking.Therefore,construction safety can be significantly improved.
extended reach horizontal wellhigh water vertical ratiofull-floating casing runningcomparative advantage
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