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Extra resources for Deep Drilling Basic Research Vol 4 [system descriptions]

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Roller bits have several advantages including 1) indenting action of the roller-bit cutter generates less heat than the shearing action of the drag bit, and 2 ) the teeth of an indenting roller bit are periodically removed from the rock. and cooled by the flushing fluid. It b likely that bo& roller bits and drag bits will remain important drilling tools in both shallow and deep drilling with tirag bitr dominating h the softer, more ductile rocks. and roller bits proving superior in the harder, more brittle matcriaiS.

Turbodrill RolIer Thrust Bearings h4aurcr Engineering'' developed a geothermal turbodrill for use in Los Alamos National Laboratories hot, dry rock geothermal well at Fenton Hill, New Mexico. All elastomers were eliminated from this turbodrill to allow it to operate at temperatures in excess of 6OOOF (Figure 3-42). pis is the bighest temperature downhole drilling syntm ever dcveloped'&d demonstrates that motors ixm operate 3t the tcniyeraturu existing in deep g=welb. *' --. 5 . * ' a .. 7i- 7 - * hi;\ mnwa sazlom Figure 3 - 4 2 LANL Geothermal Turbodrill ,rURIlWL A I.

I --m- . - -. M A piston/spring component is used to cover the valve port when circulation (and higher differential pressure) is initiated. Figure 3-27. PDM Bypass Valve Vof. I 3-26 . The motor &on consists of a iomr and sgtor as shorn in Figure . j - ~ ” Figure 3-38. PDM Motor Section For PDM stators always contain one more lobe than the rotor (Figure 3-;9L3 example, a 1/2-lobe PDM (single lobe) has a one-lobe rotor, and a two-lobe stator, likewise. 3 3 -1lobe PDM (multilobe) has a three-lobe rotor and a four-lobe sfator.

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Deep Drilling Basic Research Vol 4 [system descriptions]

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