US 11,891,890 B2
Drilling control
Richard Meehan, Houston, TX (US); and James Belaskie, Houston, TX (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 17/758,034
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Dec. 18, 2020, PCT No. PCT/US2020/065789
§ 371(c)(1), (2) Date Jun. 27, 2022,
PCT Pub. No. WO2021/133641, PCT Pub. Date Jul. 1, 2021.
Claims priority of provisional application 62/954,349, filed on Dec. 27, 2019.
Prior Publication US 2023/0012511 A1, Jan. 19, 2023
Int. Cl. E21B 44/00 (2006.01); E21B 47/12 (2012.01); E21B 47/04 (2012.01)
CPC E21B 47/12 (2013.01) [E21B 44/00 (2013.01); E21B 47/04 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving block position data of a rig prior to addition of a length of pipe to a drillstring, wherein the drillstring is disposed at least in part in a borehole and supported by the rig;
receiving block position data of the rig after addition of the length of pipe to the drillstring; and
controlling position of the drillstring with respect to time using the rig and at least a portion of the block position data for landing a drill bit of the drillstring on a bottom of the borehole,
wherein controlling position of the drillstring with respect to time comprises controlling velocity of the drillstring in an in-hole direction based at least in part on a computed distance between the drill bit and the bottom of the borehole, wherein the computed distance is based at least in part on at least a portion of the block position data.