Patent ID: 11859124
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C

Claim 5:
6. A method of designing a cement that has a fluid loss requirement comprising:
providing a plurality of polymers, specification requirements for fluid loss control and wet time of a cement slurry comprising a polymer;
measuring physicochemical properties of each of the plurality of polymers, the physicochemical properties comprising polydispersity index (PDI), radius of gyration (Rg), concentration (conc) and weight average molecular weight (Mw);
estimating the fluid loss performance and wet time of each of the plurality of polymers by entering the measured physicochemical properties of each of the plurality of polymers using a model of fluid loss, wherein correlating fluid loss performance and wet time of each of the plurality of polymers comprises using a model of fluid loss, the model being a function of at least one physical property of a polymer, wherein the model is of the form of:

ln(FL)=A+B*PDI+C*Rg+D[CONC]+E*Mw

where A, B, C, D, and E are constants and FL is fluid loss, where A, B, C, D, and E are determined by regression analysis of PDI, Rg, Mw, and fluid loss at a concentration for each polymer in the plurality of polymers;
selecting at least one polymer from the plurality of polymers such that the estimated fluid loss performance of a treatment fluid prepared with the polymer satisfies the fluid loss specification and wet time specification;
preparing a test fluid comprising the selected polymer;
measuring a fluid loss of the test fluid;
preparing a cement slurry comprising the selected polymer when the fluid loss of the test fluid is less than the fluid loss specification, wherein the preparing of the cement slurry accounts for an effect of Rg of the selected polymer on the fluid loss performance and is based, at least in part, on the constants; and
introducing the cement slurry into a wellbore.