DRILLING SYSTEM FOR MAKING LWD MEASUREMENTS AHEAD OF THE BIT

摘要

A drilling system (100,500,600,700,800) includes integral drill bit body (300) and logging while drilling tool body portions (200). There are no threads between the drill bit and the LWD tool. In one exemplary embodiment the drilling system (100,500,600,700,800) includes a unitary tool body, i.e., a tool body formed from a single work piece. In another exemplary embodiment the drill bit body portion (300) is welded (410) to the LWD tool body portion (200). At least one LWD sensor (340,370) is deployed in the drill bit (300). The drilling system (100,500,600,700,800) enables multiple LWD sensors (340,370) to be deployed in and near the bit (e.g., on both the side and bottom faces of the bit). The absence a threaded connection facilitates the placement of electrical connectors, LWD sensors (340,370), and electronic control circuitry at the bit.