1 EXHIBIT 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the following Registration Statements of National-Oilwell, Inc. of our report dated June 9, 1998 with respect to the consolidated financial statements of Phoenix Energy Products Holdings, Inc. included in this Current Report (Form 8-K/A). Form Description - ---- ----------- S-8 Stock Award and Long Term Incentive Plan, Value Appreciation and Incentive Plan A and Value Appreciation and Incentive Plan B (No. 333-15859) S-8 National-Oilwell Retirement and Thrift Plan (No. 333-46459) S-8 Post Effective Amendment No. 3 to the Registration Statement on Form S-4 filed on Form S-8 pertaining to the Dreco Energy Services Ltd. Amended and Restated 1989 Employee Incentive Stock Option Plan, as amended, and Employment and Compensation Arrangements Pursuant to Private Stock Option Agreements (No. 333-32191) S-3 Post Effective Amendment No. 4 to Form S-4 filed on Form S-3 (No. 333-32191) S-3 Post Effective Amendment No. 4 to Form S-4 filed on Form S-3 (No. 333-32191) ERNST & YOUNG LLP Houston, Texas August 14, 1998