Dynamic Point-the-bit Rotary Steerable Drilling Tool and Measuring Method Thereof

摘要

The invention relates to a dynamic point-the-bit rotary steerable drilling tool and a measuring method thereof. The dynamic point-the-bit rotary steerable drilling tool comprises a rotary housing, a stabilized platform assembly, a hollow servo-motor assembly, a drilling fluid passage, an inner eccentric ring, an outer eccentric ring, a drilling bit shaft and a universal joint. The dynamic point-the-bit rotary steerable drilling tool also comprises a stabilized platform communication and power supply system which includes an instrument storehouse fixed at the upper end of the rotary housing, a main circuit board, an auxiliary circuit board mounted on the stabilized platform upper-end cover, an electromagnetic coupler primary-side, an electromagnetic coupler secondary winding and an electromagnetic coupler primary-side mounting plate fixed at the lower end of a coupler. The main circuit board is mounted on the electromagnetic coupler primary-side mounting plate, the electromagnetic coupler secondary winding is connected with the auxiliary circuit board, and the auxiliary circuit board is connected with the attitude sensor mounted on the side wall of the upper end of the stabilized platform body. By the dynamic point-the-bit rotary steerable drilling tool, hollow drilling fluid passage, power supply and signal transmission of the stabilized platform sensor, attitude angle parameter measurement and toolface angle real-time control of the rotary steerable drilling tool are realized.

主权项

1. A dynamic point-the-bit rotary steerable drilling tool, comprising a rotary housing (19), a stabilized platform assembly (37), a hollow servo-motor assembly (16), a drilling fluid passage (18), an inner eccentric ring (31), an outer eccentric ring (7), a drilling bit shaft (5) and a universal joint (38). The stabilized platform assembly (37) comprises a stabilized platform body (10) mounted in the rotary housing (19) and a stabilized platform upper-end cover (12) connected with the stabilized platform body; a stabilized platform upper-bearing (11) is fixed between the stabilized platform body (10) and the stabilized platform upper-end cover (12); the upper end of the stabilized platform upper-end cover (12) is connected with a gear box of the hollow servo-motor assembly (16) through a coupler (15), and the lower end of the stabilized platform body (10) is connected with the outer eccentric ring (7). The said dynamic point-the-bit rotary steerable drilling tool further comprises a stabilized platform communication and power supply system, wherein said stabilized platform communication and power supply system incorporates an instrument storehouse (20) fixed at the upper end of the rotary housing (19), a main circuit board (24), an auxiliary circuit board (27) mounted on the stabilized platform upper-end cover (12), an electromagnetic coupler primary-side (26), an electromagnetic coupler secondary winding(13) and an electromagnetic coupler primary-side mounting plate (14) fixed at the lower end of a coupler (15). The main circuit board (24) is mounted on the electromagnetic coupler primary-side mounting plate (14), the electromagnetic coupler secondary winding (13) is connected with the auxiliary circuit board (27), and the auxiliary circuit board (27) is connected with an attitude sensor (30) mounted on the side wall of the upper end of the stabilized platform body (10). The electromagnetic coupler primary-side (26) is mounted relative to the electromagnetic coupler secondary winding(13) with an air layer reserved therebetween, the electromagnetic coupler primary-side (26) is static relative to the rotary housing (19), and the electromagnetic coupler secondary winding(13) is static relative to the stabilized platform body (10).