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Keywords: ball-drop reamer
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Proceedings Papers

Paper presented at the SPE North Africa Technical Conference and Exhibition, September 14–16, 2015
Paper Number: SPE-175696-MS
... assembly (BHA) with one ball-drop reamer leaves a 35-m to 40-m rathole below the 9 5/8-in. casing shoe, which induces different issues related to casing reaching bottom, cementing, potential packoffs due to overburden formation collapse while drilling the 8 ½-in. section in reservoir, problems in running...

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