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drill bits, drill pipes, drill collars, centralisers and other equipment, specially designed for use in and with oil and gas well drilling equipment.
centralizadores e outros equipamentos, especialmente concebidos para utilização em e com equipamentos de perfuração de poços de petróleo e gás natural.
;to drill the well* the drill bit, aided by the weight of thick walled pipes called "drill collars" above it, cuts into the rock.
==== perfurando o poço ====* a broca de perfuração, auxiliada pelo peso de tubos de parede espessa chamados ""drill collars"" acima dela, corta a rocha.