Exercise 1 The Hoisting System
A drillstring with a buoyant weight of 200,000 lbs must be pulled from the well. A total of 8 lines are strung between the crown block and the travelling block. Assuming that a four sheave, roller bearing system is being used.
a. The tension in the fast line :
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F |
Tf = 29691 lbs
b. The tension in the deadline
c. The vertical load on the rig when pulling the string
Total = 200000 + 29691 + 25000 = 254691 lbs
Consider a triplex pump having 6in. liners and 11in. stroke operating at 120 spm and a discharge pressure of 3000 psi.
a. The volumetric output at 100% efficiency
Q =
b. The Horsepower output of the pump when operating under the conditions above.
1. INTRODUCTION
2. DRILLPIPE
2.1 Drillpipe Stress and Failure
2.2 Drillpipe Inspection
3. TOOL JOINTS
4. HEAVY WALL DRILLPIPE (HWDP)
5. DRILL COLLARS
5.1 Special Types of Collar
6. OTHER DRILLSTRING COMPONENTS
6.1. Stabilisers
6.2 Roller Reamer
. 6.3 Shock sub (vibration dampener)
6.4. Subs (substitutes)
6.5. Drilling Jars
7. DRILL STRING DESIGN
7.1. Design of a Stabilised String
7.2 Bending Moments in String Design
7.3 Length of Drillcollars
7.4 Drill Pipe Selection
7.4 Design Procedure
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