US 12,312,953 B2
Steering actuation methodology for a rotary steerable system
Alexander Trushin, Cheltenham (GB); Ling Li, Stonehouse (GB); and Geoffrey Charles Downton, Stonehouse (GB)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Oct. 20, 2022, as Appl. No. 18/048,056.
Claims priority of provisional application 63/262,811, filed on Oct. 21, 2021.
Prior Publication US 2023/0131473 A1, Apr. 27, 2023
Int. Cl. E21B 7/06 (2006.01); E21B 21/08 (2006.01); E21B 47/00 (2012.01); E21B 47/12 (2012.01)
CPC E21B 7/06 (2013.01) [E21B 21/08 (2013.01); E21B 47/00 (2013.01); E21B 47/12 (2013.01)] 15 Claims
OG exemplary drawing
 
11. A method for drilling a subterranean wellbore, the method comprising:
(a) rotating a bottom hole assembly (BHA) in the subterranean wellbore to drill, the BHA including a rotary steerable tool or a steerable drill bit having at least first, second, and third circumferentially spaced external pads configured to extend radially outward into contact with a wall of the wellbore and thereby steer the drilling;
(b) selecting, via a processor, a steering ratio;
(c) selecting, via the processor, a time interval;
(d) measuring, via a sensor, a rotation rate of the BHA rotation in (a);
(e) receiving, via the processor, a drilling parameter waveform; wherein the drilling parameter waveform is sinusoidal in shape;
(f) processing, via the processor, the steering ratio selected in (b) to compute a number of pad extensions in the time interval selected in (c);
(g) processing, via the processor, the rotation rate measured in (d) and a total number of potential pad extensions in the selected time interval to compute times for each of the potential pad extensions in the selected time interval;
(h) evaluating, via the processor, the drilling parameter waveform received in (e) at each of the computed times of the potential pad extensions in the selected time interval to select discrete pad extension times, wherein the discrete pad extension times are selected to overlap maxima in the drilling parameter waveform; and
(i) extending the at least first, second, and third pads at corresponding ones of the selected discrete pad extension times to steer the drilling.