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Alternate Mid-Term solution 09

Alternate Mid-Term solution 09 - PGE 430 Drilling Alternate...

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PGE 430 Drilling Alternate Mid-Term Exam Solution Name: _____________________ This is a closed book, closed notes test. You will be given a set of equation and chart pages you may use. You will need a pen or pencil and a calculator. Extra paper is available should you need any. You may not bring in any other paper. Please turn in all paper at the end of the exam, including the equation pages.

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(1) (+1 pt) Please write an equation that shows why the load on the derrick is more than just the hook load. Determine the derrick load if the dead line is anchored to leg A and the force on the static (or dead) line is measured as 50,000 lbs. The blocks are strung on 10 lines and the efficiency is 0.81. Recall that ( 29 fast line force (lbs) hook load (lbs) number of lines strung block efficiency 50,000 10 500,000 lb 50,000 61,728 lb 0.81 f f W F nE W n E W F = = = = = = = = = [ ] [ ] 2 4 4 4 2 1 0.81 0.81 10 1 500,000 611,728 lbs 0.81 10 d A B C D f d s d F F F F F F W W W F F E En F W En = + + + = + + + + + + + + = = = mouse hole rat hole Draw Works
(2) (+2 pts) Please determine - (a) The inner diameter of a steel drill collar if the outer diameter is 8”, the drill collar weight is 131 Lb/ft, and the density of steel is 489 Lb/cubic foot. ( 29 2 2 8 489 131 4 12 12 3.857" i i d d π � � � � - = � � � � � � � � = (b) How many pump strokes will be required to fill 270 feet of these drill collars if the pump output is 1.655 gallons/stroke. Recall there are 231 cubic inches in one

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