US 11,806,897 B2
Adjusting control gain based on error sampling in automated cement mixing
Carlos Junior Urdaneta, Houston, TX (US); James Dean, Houston, TX (US); Oscar Montemayor, Missouri City, TX (US); Rajnarayanan Subbu Balsamy, Sugar Land, TX (US); and Dinh Quy Nguyen, Sugar Land, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 16/468,648
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Dec. 12, 2017, PCT No. PCT/US2017/065663
§ 371(c)(1), (2) Date Jun. 11, 2019,
PCT Pub. No. WO2018/111785, PCT Pub. Date Jun. 21, 2018.
Claims priority of provisional application 62/433,040, filed on Dec. 12, 2016.
Prior Publication US 2020/0206975 A1, Jul. 2, 2020
Int. Cl. G05B 6/02 (2006.01); B28C 7/04 (2006.01); B28C 9/00 (2006.01); E21B 33/13 (2006.01)
CPC B28C 7/0418 (2013.01) [B28C 9/004 (2013.01); E21B 33/13 (2013.01); G05B 6/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus operable to control a density or solids fraction of a cement slurry at a cementing unit, comprising:
a processor; and
a non-transitory computer readable memory including computer program code, wherein the processor, the memory, and the computer program code are collectively operable to:
regulate the density or the solids fraction of the cement slurry employing a proportional-integral-derivative (PID) control loop feedback arrangement in the cementing unit;
identify proportional, integral, and derivative gains of the PID control loop to be used for reducing a density error or a solids fraction error, based on information in a database, wherein the information includes historical gain values with resulting cementing errors associated with the historical gain values, wherein identifying the proportional, integral, and derivative gains includes identifying a subset of the proportional, integral, and derivative gains that is impacted by a feature of the cementing unit; and
adjust the proportional, integral, and derivative gains of the PID control loop feedback arrangement in response to the density error or the solids fraction error based on the identification, wherein adjusting the proportional, integral, and derivative gains alters a volumetric flow rate of at least one of a cement blend or a mix fluid to adjust the density or the solids fraction of the cement slurry.