Method of treating a subterranean formation using a rheology model for fluid optimization
First Claim
Patent Images
1. A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
- a. predicting a plurality of formation treatment scenarios for a treatment fluid comprising a polymer and a crosslinker using a fluid rheology model comprising;
i. inputting a concentration of polymer and a concentration of crosslinker,ii. inputting temperature, formation pressure, and shear rate profiles over the course of the treatment,iii. determining a concentration of crosslinks over the course of the treatment based upon the input values from i. and ii, andiv. determining the fluid rheology over the course of the treatment based on the concentration of crosslinks over the course of the treatment;
b. selecting a treatment scenario from the plurality of formation treatment scenarios which provides fluid rheology properties during the course of treatment;
c. preparing and injecting the treatment fluid into the wellbore; and
,d. treating the subterranean formation.
1 Assignment
0 Petitions
Accused Products
Abstract
Subterranean formation treatment methods incorporating a rheology model which enables prediction of fluid rheology properties during a treatment operation, where the foundation of the model is a description of the reaction chemistry which describes how the number of crosslinks and broken polymer linkages develops in time under the influence of crosslinkers, breakers, and/or thermally induced effects and pressure effects. In one aspect, when used as a tool for simulating the fluid viscosity, the model can help optimizing the fluid design and optional breaker schedule for a hydraulic fracturing treatment.
-
Citations
20 Claims
-
1. A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
-
a. predicting a plurality of formation treatment scenarios for a treatment fluid comprising a polymer and a crosslinker using a fluid rheology model comprising; i. inputting a concentration of polymer and a concentration of crosslinker, ii. inputting temperature, formation pressure, and shear rate profiles over the course of the treatment, iii. determining a concentration of crosslinks over the course of the treatment based upon the input values from i. and ii, and iv. determining the fluid rheology over the course of the treatment based on the concentration of crosslinks over the course of the treatment; b. selecting a treatment scenario from the plurality of formation treatment scenarios which provides fluid rheology properties during the course of treatment; c. preparing and injecting the treatment fluid into the wellbore; and
,d. treating the subterranean formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
-
a. predicting a plurality of formation treatment scenarios for a fluid comprising a polymer, using a fluid rheology model comprising; i. inputting a concentration of polymer, ii. inputting temperature, formation pressure and shear rate profiles over the course of the treatment, and iii. determining the fluid rheology over the course of the treatment by considering concentration of polymer, and temperature, pressure and shear rate profiles over the course of the treatment; b. selecting a treatment scenario from the plurality of formation treatment scenarios which provides fluid rheology properties during the course of treatment; c. preparing and injecting the treatment fluid into the wellbore; and
,d. treating the formation.
-
Specification