US 12,406,751 B2
Fluid loss requirement of a cement slurry using bulk blend materials
John Paul Bir Singh, Kingwood, TX (US); and Siva Rama Krishna Jandhyala, Spring, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Oct. 13, 2021, as Appl. No. 17/500,116.
Prior Publication US 2023/0111521 A1, Apr. 13, 2023
Int. Cl. G16C 20/30 (2019.01); C09K 8/487 (2006.01); G16C 20/70 (2019.01)
CPC G16C 20/30 (2019.02) [C09K 8/487 (2013.01); G16C 20/70 (2019.02)] 17 Claims
OG exemplary drawing
 
1. A method of designing a cement slurry comprising:
(a) selecting at least a cementitious material and concentration thereof, a water and concentration thereof, and a fluid loss control additive and concentration thereof to form a cement slurry recipe;
(b) calculating a fluid loss of the cement slurry recipe using a fluid loss model, wherein the fluid loss model comprises an equation of the following form:

OG Complex Work Unit Math
where FL is fluid loss, FL0i is a constant for each cementitious material i in the cement slurry, Pi is concentration of cementitious material i in the cement slurry recipe, w is amount of water in the cement slurry recipe, αi is a constant, γ is a measure of effectiveness of fluid loss control additive, n is a constant, and C is a concentration of fluid loss control additive in the cement slurry recipe;
(c) comparing the fluid loss of the cement slurry recipe to a fluid loss requirement, wherein steps (a)-(c) are repeated if the fluid loss of the cement slurry recipe does not meet or stay below the fluid loss requirement, wherein each repeated step of selecting comprises selecting different concentrations and/or different chemical identities for the fluid loss control additive, cementitious material, or water than previously selected, or step (d) is performed if the fluid loss of the cement slurry recipe meets or stays below the fluid loss requirement;
(d) preparing a cement slurry based on the cement slurry recipe, wherein the cement slurry has the property of having fluid loss at or below the fluid loss requirement; and
(e) introducing the cement slurry into a subterranean formation, wherein the cement slurry sets to form a hardened mass.