US 12,460,497 B2
Systems and methods for controlling head tension
Fanping Bu, Sugar Land, TX (US); Vassilis Varveropoulos, Katy, TX (US); Ken-Vidar Ditlefsen, Sugar Land, TX (US); and Hisayo Tauchi, Sugar Land, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 18/706,907
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Dec. 14, 2022, PCT No. PCT/US2022/052808
§ 371(c)(1), (2) Date May 2, 2024,
PCT Pub. No. WO2023/121930, PCT Pub. Date Jun. 29, 2023.
Claims priority of provisional application 63/365,073, filed on May 20, 2022.
Claims priority of provisional application 63/291,648, filed on Dec. 20, 2021.
Prior Publication US 2025/0020029 A1, Jan. 16, 2025
Int. Cl. E21B 23/14 (2006.01); E21B 19/00 (2006.01)
CPC E21B 23/14 (2013.01) [E21B 19/008 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for regulating head tension in a wireline system including a cable operatively attached to a winch and a tool driving equipment, the method comprising:
operating the winch with a cable speed;
operating the tool driving equipment with a tool driving speed;
determining the head tension based on the tool driving speed of the tool driving equipment and the cable speed of the cable as a function of an operation of the winch;
determining a head tension regulation error based on a first comparison of the head tension and a target head tension;
applying a model predictive control framework to the head tension, the tool driving speed, the cable speed, and the head tension regulation error, the model predictive control framework generating an operating zone for the winch and the tool driving equipment, wherein the model predictive control framework solves an objective function that is constrained by at least one of surface tension limits, winch speed limits, winch acceleration and deceleration limits, tractor speed limits, or tractor acceleration and deceleration limits, wherein the operating zone is defined by a first range of speed values for a speed difference between the tool driving speed of the tool driving equipment and the cable speed, and a first range of tension values for a tension difference between the head tension and the target head tension; and
adjusting, using the head tension regulation error, the operating of the winch and the tool driving equipment to reduce an actual difference between the tool driving speed of the tool driving equipment and the cable speed to within the first range of speed values of the operating zone.