In order to meet the evaluation requirements of geological reservoirs for formations and save drilling time,the proportion and depth of lateral drilling in exploration wells have also increased year by year[1-4].This article focuses on the S well Φ Taking the 244.47 mm casing single pass window opening operation as an example,this article will elaborate on the deep casing window opening technology and key points in Bohai Oilfield from the aspects of sidetracking point selection,operation preparation,window opening operation procedure,and open hole drilling.For deep and ultra-deep wells,it is proposed to position the directional guide surface of the inclinometer at the wellhead,lock the turntable throughout the drilling process,and then gyroscopic retesting be used to confirm,which can greatly save time and provide technical guidance for subsequent deep casing window opening operations.
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