Systems and Methods to Increase the Durability of Carbonate Reservoir Acidizing
AssigneeWeatherford Technology Holdings, LLC
InventorsMohammadreza Safariforoshani, Francisco Fragachan
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Abstract
Systems and methods for predicting and optimizing the effects of acidizing treatment of carbonate rock are disclosed. The disclosed methods predict the conflicting effects of increased production (i.e., wormhole creation) and reduced rock compressive strength due to acid rock reactions. The mechanical stability of stimulated wellbores, such as horizontal wellbores, can be determined under different acidizing conditions, such as acid type and volume. The acidizing conditions can be optimized to maximize short and long-term production.
Claims20
A method of acidizing a formation traversed by a wellbore, the method comprising:
- determining an optimized acidizing fluid, and
- providing the optimized acidizing fluid to the formation, wherein
- determining the optimized acidizing fluid comprises:
- providing a set of acidizing parameters,
- determining a distribution of reactive and non-reactive fluids along the wellbore during acidizing based on the set of acidizing treatment parameters,
- determining a dissolution of the formation within a region of the wellbore based on the determined distribution of reactive and non-reactive fluids,
- determining one or more mechanical parameters of the formation within the region of the wellbore based on the determined dissolution,
- predicting damage to the formation during hydrocarbon production based on the determined mechanical parameters,
- predicting an amount of hydrocarbon produced during hydrocarbon production based, at least in part, on the predicted damage, and
- adjusting the set of acidizing parameters to maximize the predicted amount of hydrocarbon produced during hydrocarbon production.
A method of optimizing an acidizing treatment of a formation traversed by a wellbore, the method comprising:
- for an initial set of acidizing parameters, determining a distribution of reactive fluid along the wellbore,
- using a finite element model to determine porosity evolution along the wellbore based on the determined distribution of reactive fluid,
- determining one or more mechanical parameters of the formation based on the determined porosity evolution,
- determining a damage radius along the wellbore based on the one or more mechanical properties,
- predicting an amount of hydrocarbon produced from the formation during hydrocarbon production based on the determined damage radius, and
- adjusting the initial set of acidizing parameters to maximize the predicted amount of hydrocarbon produced during hydrocarbon production.
A non-transitory computer readable medium having instructions stored therein, which when executed by a computer cause the computer to perform operations comprising:
- for an initial set of acidizing parameters, determining a distribution of reactive fluid along the wellbore,
- determining a dissolution of the formation within a region of the wellbore based on the determined distribution of reactive and non-reactive fluids,
- determining one or more mechanical parameters of the formation within the region of the wellbore based on the determined dissolution,
- predicting damage to the formation during hydrocarbon production based on the determined mechanical parameters,
- predicting an amount of hydrocarbon produced during hydrocarbon production based, at least in part, on the predicted damage, and
- adjusting the set of acidizing treatment parameters to maximize the predicted amount of hydrocarbon produced during hydrocarbon production.
Dependencies are inferred from the claim text.