BIT FOR DRILLING WITH CASING OR LINER STRING AND MANUFACTURE THEREOF |
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| 申请号 | US15629083 | 申请日 | 2017-06-21 | 公开(公告)号 | US20180016847A1 | 公开(公告)日 | 2018-01-18 |
| 申请人 | VAREL INTERNATIONAL IND., L.P.; | 发明人 | Gary M. THIGPEN; Bruno CUILLIER DE MAINDREVILLE; Gilles GALLEGO; | ||||
| 摘要 | A bit for drilling with a casing or liner string includes: a tubular stem made from a high strength metal or alloy; a head: having a cutting face with an inner cone, an outer shoulder, and an intermediate nose between the cone and the shoulder; attached to an end of the stem; and made from a nonferrous metal or alloy; a plurality of blades formed integrally with the head, made from the nonferrous metal or alloy, and each extending from a center of the cutting face to the shoulder; a plurality of superhard cutters mounted along each blade; a plurality of gauge pads formed integrally with the stem; and a flush joint formed between each blade and a respective gauge pad. A yield strength of the high strength metal or alloy is at least twice a yield strength of the nonferrous metal or alloy. | ||||||
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| 说明书全文 | |||||||
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