Method of optimizing the design, stimulation and evaluation of matrix treatment in a reservoir
First Claim
1. A method for modeling a stimulation treatment for a reservoir, comprising the steps of:
- obtaining a set of quantified reservoir parameters including the reservoir minerals;
designing a first treatment fluid comprising a mixture of chemical species;
obtaining a first set of chemical reactions that can occur between the minerals and the component of the treatment fluid;
said reactions defined by their equilibrium and their kinetic properties;
selecting a subset of said first set of chemical reactions to create a reaction model of said minerals with said treatment fluid and predict damages consecutive of the treatment; and
iteratively adjusting the stimulation treatment to optimize results.
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Abstract
A method for designing acid treatments provides for the selection of optimal treatment for well stimulation wherein reservoir characteristics are obtained to further select the reaction kinetic data on the minerals of interests, the treatment to the reservoir is scaled up using a mathematical model and real time damage are computed based on bottomhole pressure and injection rate and compared to that predicted by the mathematical model to adjust the treatment. The model generated facilitates optimization of matrix treatments by providing a rapid quantitative evaluation of various treatment strategies for a formation. Stimulation with non-traditional fluid recipes containing mixtures of inorganic and organic acids, and chelating agents can be readily computed. The computed values can then be used in an economic model to justify the additional costs associated with the use of the non-traditional fluids. Apart from optimizing matrix treatments, the method can be used as a development tool for new fluid systems, as a tool for prediction and removal of inorganic scale and for fluid compatibility testing such as that required in water flooding projects.
16 Citations
23 Claims
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1. A method for modeling a stimulation treatment for a reservoir, comprising the steps of:
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obtaining a set of quantified reservoir parameters including the reservoir minerals;
designing a first treatment fluid comprising a mixture of chemical species;
obtaining a first set of chemical reactions that can occur between the minerals and the component of the treatment fluid;
said reactions defined by their equilibrium and their kinetic properties;
selecting a subset of said first set of chemical reactions to create a reaction model of said minerals with said treatment fluid and predict damages consecutive of the treatment; and
iteratively adjusting the stimulation treatment to optimize results. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for modeling a stimulation treatment for a reservoir, comprising the steps of:
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obtaining a set of quantified reservoir parameters including the reservoir minerals, permeability and the quantity and depth of damage to the reservoir;
modeling a reservoir core having a length and a diameter;
designing a first treatment fluid comprising a mixture of chemical species;
obtaining a first set of chemical reactions that can occur between the minerals and the component of the treatment fluid;
said reactions defined by their equilibrium and their kinetic properties;
selecting an injection rate of the treatment fluid;
selecting a subset of said first set of chemical reactions to create a reaction model of sail core with said treatment fluid and predict damages consecutive of the treatment; and
iteratively adjusting the stimulation treatment to optimize results. - View Dependent Claims (12, 13, 14, 16, 17, 18, 19, 20, 21)
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15. A method for modeling a stimulation treatment for a reservoir, comprising the steps of:
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obtaining a set of quantified reservoir parameters including the reservoir minerals, permeability and the quantity and depth of damage to the reservoir;
designing a first treatment fluid comprising a mixture of chemical species;
obtaining a first set of chemical reactions that can occur between the minerals and the component of the treatment fluid;
said reactions defined by their equilibrium and their kinetic properties;
selecting an injection rate of the treatment fluid;
selecting a subset of said first set of chemical reactions to create a reaction model of said reservoir with said treatment fluid and predict damages consecutive of the treatment; and
iteratively adjusting the stimulation treatment to optimize results.
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22. A method for performing a stimulation treatment for a reservoir, comprising the steps of:
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obtaining a set of quantified reservoir parameters including the reservoir minerals, permeability and the quantity and depth of damage to the reservoir;
designing a first treatment fluid comprising a mixture of chemical species;
obtaining a first set of chemical reactions that can occur between the minerals and the component of the treatment fluid;
said reactions defined by their equilibrium and their kinetic properties and therefore creating a mathematical model of the treatment;
selecting an injection rate of the first treatment fluid;
selecting a subset of said first set of chemical reactions to create a reaction model of said reservoir with said treatment fluid and predict damages consecutive of the treatment;
pumping said first treatment fluid at a first injection rate while measuring the bottomhole pressure;
computing real-time damages to the reservoir from the measured bottomhole pressure and injection rate;
simultaneously computing the damages based on the mathematical model; and
adjusting the stimulation treatment to optimize results.
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23. A method for designing a stimulation treatment fluid for a reservoir, comprising the steps of:
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obtaining a set of quantified reservoir parameters including the reservoir minerals;
designing a first treatment fluid comprising a mixture of chemical species;
obtaining a first set of chemical reactions that can occur between the minerals and the component of the treatment fluid;
said reactions defined by their equilibrium ad their kinetic properties and therefore creating a mathematical model of the treatment;
selecting a subset of said first set of chemical reactions to create a reaction model of said reservoir minerals with said treatment fluid and predict damages consecutive of the treatment;
iteratively adjusting the stimulation treatment to optimize results; and
performing laboratory experiments on the optimized stimulation treatments thereby reducing the number of experiments required for designing a new treatment.
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Specification