30,000 pullback rating can be used as an additionalhoist.A split centralizer and pipe-handling system locatedon the ITWD worktable is used to break and make drillpipe connections, to support the drill string during pipehandling, to provide a centralizer bushing for the drillstring, and to aid in setting casing and making casingjoint. The centralizer is a split design consisting of a rearsection welded to the main frame and a removableforward section. The forward section is held in place bytwo pins and can be manually swung out or detached tofacilitate setting large diameter casing or surface pipe.The forward section is removed during transport andstored on top of the worktable. The centralizeraccommodates various sizes of split bushings to adaptto a number of drill pipe, casing, and down-hole-drillinghammer diameters.A hydraulically powered breakout wrench is alsomounted on the worktable. This wrench is used with amanual holding wrench (used to support the drill stringand stop rotation) to make and break pipe and casingjoints.Top-Head Drilling OperationsAll personnel assigned to drill with the ITWDshould thoroughly read and understand the operator’smanualbefore proceeding with any drilling operations.Additionally, SAFETY IS PARAMOUNT over allactions performed during drilling operations.In general, you proceed to set up the rig as follows:Move the rig into position on the selected site. Use thehydraulic outriggers to level the rig and take the weightof the rig off the axles. Ensure adequate overheadclearance; then raise and lock the derrick.For the top-head drilling rig proceed with thefollowing:1. Attach the centralizer half to the worktable.2. Install the centralizer bushings.3. Place the bottom holding wrench in position.4. Dope (lubricant for threads) the top-headspindle sub threads.5. Lower the hoist and attach the hoist plug.6. Raise the top-head.7. Dope the tri-cone bit threads (down-hole-drilling hammer treads if hammer drilling).8. Manually thread the bit into the bit sub.9. Wrap the mud flinger around the bit sub.10. Dope the hoist plug threads and thread into thebit sub.11. Raise the bit sub with the hoist and insert intothe centralizer bushing.12. Insert the holding wrench to the support bit sub;close the forward half of the centralizer and pin it shut.13. Remove the hoist plug from the bit sub.Installation of the Drill Pipe:1. Slide the drill pipe sling over the drill pipe.2. Attach the hoist cable to the drill pipe sling andhoist the drill pipe into position over the bit sub.3. Lower the top-head into position with therotation on slow.4. Tighten all connections and raise the drillslightly off the holding wrench and remove the holdingwrench.Rotary Mud Drilling:1. The mud pits for top-head drilling are dug anddesigned, as shown in figure 9-10.2. Connect the suction hose to the mud standpipe.3. Place the suction hose into the mud pit andconnect the hose to the mud pump inlet.4. Set the engine speed to the manufacturer’srecommendations and open the mud pump valve.5. Control the mud flow by adjusting the mudpump speed.6. While drilling, adjust the top-head drive spindlerotation and pulldown speed and monitor the mud pumpstand pressure to avoid a plugged drill bit or loss ofpump prime.7. Upon completion of the hole, place the suctionhose in a source of clean water and flush the drill pipesand bit.Rotary Air Drilling:1. Lower the bit to within 4 inches of the ground,and connect the flushing line to the air compressor.2. Turn on the compressor, open the air valve, andset the engine speed at the speed recommended by themanufacturer.3. Set the pulldown regulator to a minimum andstart the top-head drive spindle rotation, and set thepulldown speed to LOW.9-12
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