1 EXHIBIT 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the reference to our firm under the caption "Experts" and "Auditors, Transfer Agent and Registrar" and to the use of our report dated July 25, 1997, with respect to the consolidated financial statements of National-Oilwell, Inc. included in Amendment No. 2 to the Registration Statement on Form S-4 (No. 333-32191) and the related Joint Management Information Circular and Proxy Statement/Prospectus of National-Oilwell, Inc. and Dreco Energy Services Ltd. Ernst & Young LLP Houston, Texas August 15, 1997