METHOD OF TREATING A SUBTERRANEAN FORMATION USING A RHEOLOGY MODEL FOR FLUID OPTIMIZATION
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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.
38 Citations
42 Claims
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1-21. -21. (canceled)
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22. A method for treating a subterranean formation, the method comprising:
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a. calculating a formation treatment plan comprising 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 fluid rheology based upon the input values from i. and ii over the course of the treatment; b. implementing the formation treatment plan comprising preparing and injecting the treatment fluid into a wellbore; and c. treating the subterranean formation. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for treating a subterranean formation, the method comprising:
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a. calculating a formation treatment plan comprising treatment fluid comprising a polymer and a crosslinker using a fluid rheology model comprising; i. a concentration of polymer and a concentration of crosslinker, ii. temperature, formation pressure, and shear rate profiles over the course of the treatment, iii. a fluid rheology estimate based upon the input values from i. and ii; b. implementing the formation treatment plan to form and introduce the treatment fluid into a wellbore; and c. treating the subterranean formation. - View Dependent Claims (38, 39, 40, 41)
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42. A method for treating a subterranean formation, the method comprising:
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a. calculating a formation treatment plan comprising treatment fluid comprising a polymer and a crosslinker using a fluid rheology model comprising; i. inputting a concentration of polymer, a concentration of crosslinker, a concentration of breaker, concentration of one or more pH modifiers, and a crosslinking delay agent, ii. inputting temperature, formation pressure, and shear rate profiles over the course of the treatment, iii. determining a fluid rheology based upon the input values from i. and ii over the course of the treatment; b. implementing the formation treatment plan comprising preparing and injecting the treatment fluid into a wellbore.
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Specification