Required BHA Weight For Rotary AssembliesRequired BHA Weight For Rotary AssembliesWhen two contacting surfaces (i.e drillpipe and the borehole wall) are inrelative motion, the direction of the frictional sliding force on each surfacewill act along a line of relative…Read More
BHA Weight & Weight-On-BitBHA Weight & Weight-On-BitOne important consideration in designing the BHA is determining thenumber of drill collars and heavy-weight pipe required to provide thedesired weight-on-bit. When drilling vertical wells, standa…Read More
Running Drill Pipe In CompressionRunning Drill Pipe In CompressionExamplePrior to drilling a 12.25-inch tangent section in a hard formation using aninsert bit, the directional driller estimates that they expect to use 50,000 lbsWOB. The hole inclination is 6…Read More
Higher Grade Pipe In The Inclined Section Of The WellHigher Grade Pipe In The Inclined Section Of The WellThe previous discussion was restricted to the simple case when the highergrade pipe is totally in the vertical portion of the well. If the higher gradepipe is used through …Read More
Maximum Hookload When Two Grades Of Drill Pipe Are UsedMaximum Hookload When Two Grades Of Drill Pipe Are UsedWhen two grades of drill pipe are used, the higher grade (i.e. the pipe withthe higher load capacity) is placed above the lower grade pipe. Themaximum tension to which th…Read More