6-60. In the operation of the rotary drilling rig, what factors work together to prevent the walls of the drill hole from collapsing when the cut material is washed to the surface by a mixture of mud and water? 1. 2. 3. 4. The filtering action of the coarse material in the settling pit The weight and viscosity and the plastering action of the fluid on the wall of the well hole The action of suspended local mud in the fluid and the additional weight of the fluid due to its content of suspended clay The suspension of cuttings in the settling pit and the spiraling of the fluid against the wall of the drill hole 6-61. What is considered the normal quantity of water needed to support an 8 hour shift of rotary   well-drilling? 1. 100  to  500  gallons 2. 500  to  750  gallons 3. 750  to  1,000  gallons 4. 1,000  to  4,000  gallons 6-62. What type of drill bit is used for drilling through a moderately hard surface formation with a rotary rig? 1. Pilot 2. Roller 3. Fishtail 4. Three way 6-63. After the well hole has been drilled the length of the kelly, what accessory is placed to keep the well from caving in from the surface? 1. Turntable 2. Surface  casing 3. Drill  collar 4. Set of slips 6-64. What depth is the top-head drive rotary  well-drilling  rig  capable of  rotary  drilling? 1. 900  feet 2. 1,000  feet 3. 1,250  feet 4. 1,500  feet 6-65. On the ITWD, what is the purpose of  the  split  centralizer? 1. To break and make drill pipe connections 2. To support the drill string  during  handling 3. To aid in setting casings 4. All of the above 6-66. What material is used to lubricate the  top-head  spindle  sub  threads? 1. Drilling lubricant 2. Petroleum jelly 3. Pipe  dope 4. Fish  oil 6-67. When performing down-hole-drilling operations, how is the oil flow checked? 1. 2. 3. 4. Inspecting the oil pattern on a piece of card board that is  placed  under  the  spindle Checking  the  amount  of  oil on  the  cuttings Placing  your  hand  under  the hammer and inspecting the amount of oil discharged Disconnecting the flushing hose and inspecting the amount of  oil  discharged  from  the hose 47