Method of Treating a Subterranean Formation using a Rheology Model for Fluid Optimization
First Claim
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 and pressure and shear rate profiles over the course of the treatment,iii. determining the concentration of crosslinks over the course of the treatment based upon the input values from i. and ii,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 which provides optimal fluid rheology properties during the course of treatment;
c. preparing and injecting the treatment fluid into the wellbore; and
d. treating the subterranean formation.
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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.
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Citations
21 Claims
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1. A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
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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 and pressure and shear rate profiles over the course of the treatment, iii. determining the concentration of crosslinks over the course of the treatment based upon the input values from i. and ii, 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 which provides optimal 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)
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20. A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
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a. predicting a plurality of formation treatment scenarios (fluid formulation and treatment schedule) for a 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, pressure and shear rate profiles over the course of the treatment, iii. determining the concentration of crosslinks over the course of the treatment based upon the input values from i. and ii, 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 which provides optimal fluid rheology properties after completion of the treatment; c. preparing and injecting the treatment fluid into the wellbore; and d. treating the formation.
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21. A method for treating a subterranean formation penetrated by a wellbore, the method comprising:
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a. predicting a plurality of formation treatment scenarios (fluid formulation and treatment schedule) for a fluid comprising a polymer, using a fluid rheology model comprising; i. inputting a concentration of polymer, ii. inputting temperature, pressure and shear rate profiles over the course of the treatment, 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 which provides optimal fluid rheology properties during the course of treatment; c. preparing and injecting the treatment fluid into the wellbore; and d. treating the formation.
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Specification