Deep Drilling Basic Research Vol 4 [system descriptions]

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Coiled tubing opentes at pressures of 7000 to 10,000 psi, so jet-assisted drill bits coul? also be used on this rig. Slim-hole motors and bits could be used on exploration wells to produce high drilling rates and reduce casing-costs by as msch as 50%. Larger diameter moton and birs could be used in larger diameter production wells. A downhole torque reactor/onenting to drill horizontal wells (Figure 3-56). Vol. - ... Figure 3-56. Advanced Deep Horizontal Well Drilling System The torque reactor sub would grip the borehole wall to provide reactive torque 3t the hole bottom, thereby allowing directional drillen to orient and guide the bottom-hole drilling assemblies.

From a rock mechanics point of view, the P D C bit rock removal shearing process is more efficient k g p x 1) the indenting action of a drag bit distributes the stresses in the rock more efficiently, 2) rocks are genenlly weaker in shear thin in compression. and 3) the P D C cnnen mechanically removes the cuttings away from the newly exposed hole bottom. The cutter of an indenting roller bit. on the other hand, has limited scrapping action. requiring the rock chips to be removed by the inefficient jetting action of the drilling mud.

The highest cost pomon of the ARCO well was the 17+ in. 100 to 14,500 ft. 1 (or less) ft/hour, and bit life averaged 66 hours. 6 ft/hour and bit life up to 282 hours. Savings were signiricant even after the rental cost of the motors was factored in and the relatively short life of the mud motors (approximately 70-80 hours) was considered. ARCO concluded that better performance was achieved with their motor/diamond bit combination because of a smaller hole size (decreased from 17+ to 16 inches), better hydraulics at the bit face because of the diamond bit.

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