Page 280 - Practical Well Planning and Drilling Manual
P. 280

Section 2 revised 11/00/bc  1/17/01  12:04 PM  Page 256








                      [      ]  Well Programming
                       2.6.2



                           Ledges can occur when there are large changes in formation hard-
                       ness. Any resistance seen while tripping prior to casing should be
                       reamed out straightaway using low WOB and high RPM.




























































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