Abstract:Historically hole-opening and underreaming operations have been restricted to softer formations. This paper describes what is believed to be the first successful drilling and underreaming of a very hard, chert-rich formation.Many producing wells have been drilled into the deep Cretaceous formations of south Mexico. These consist primarily of hard limestones containing dolomite stringers, large chert nodules, with very erratic hardness and some natural fractures; UCS estimates range from 17,000 to 30,000 psi. O… Show more
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