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US 10,590,750 B2Granted
Method of acidizing a geological formation and method of determining an effectiveness of acidizing
AssigneeKing Fahd University of Petroleum and Minerals
InventorMohamed Ahmed Nasr El-Din Mahmoud
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Abstract
A method of acidizing a geological formation is provided. A method of determining an effectiveness of the acidizing with NMR spectroscopy is also provided. Various embodiments of the method of acidizing and the method of determining the effectiveness of the acidizing are specified.
Claims20
A method of acidizing a geological formation surrounding a wellbore, comprising:
- recording a first nuclear magnetic resonance (NMR) spectrum of a portion of the geological formation over a micro-pore relaxation range, a meso-pore relaxation range, and a macro-pore relaxation range;
- calculating a first interconnectivity number by dividing a first micro-meso interconnectivity number to a first meso-macro interconnectivity number, wherein the first micro-meso interconnectivity number is a ratio of an intensity of the first NMR spectrum at a micro-meso diffusional coupling to a peak intensity of the first NMR spectrum in the micro-pore relaxation range or the meso-pore relaxation range, and the first meso-macro interconnectivity number is a ratio of an intensity of the first NMR spectrum at a meso-macro diffusional coupling to a peak intensity of the first NMR spectrum in the meso-pore relaxation range or the macro-pore relaxation range;
- acidizing the geological formation by delivering a first stimulation fluid to the portion of the geological formation, thereby forming an acidized geological formation;
- recording a second NMR spectrum of the acidized geological formation over the micro-pore relaxation range, the meso-pore relaxation range, and the macro-pore relaxation range;
- calculating a second interconnectivity number by dividing a second micro-meso interconnectivity number to a second meso-macro interconnectivity number, wherein the second micro-meso interconnectivity number is a ratio of an intensity of the second NMR spectrum at a micro-meso diffusional coupling to a peak intensity of the second NMR spectrum in the micro-pore relaxation range or the meso-pore relaxation range, and the second meso-macro interconnectivity number is a ratio of an intensity of the second NMR spectrum at a meso-macro diffusional coupling to a peak intensity of the second NMR spectrum in the meso-pore relaxation range or the macro-pore relaxation range;
- and
- re-acidizing the acidized geological formation by delivering a second stimulation fluid to the wellbore at a predetermined flow rate.
4 more elements
A method of determining an effectiveness of acidizing a geological formation, the method comprising:
- recording a first nuclear magnetic resonance (NMR) spectrum of the geological formation over a micro-pore relaxation range, a meso-pore relaxation range, and a macro-pore relaxation range;
- calculating a first interconnectivity number by dividing a first micro-meso interconnectivity number to a first meso-macro interconnectivity number, wherein the first micro-meso interconnectivity number is a ratio of an intensity of the first NMR spectrum at a micro-meso diffusional coupling to a peak intensity of the first NMR spectrum in the micro-pore relaxation range or the meso-pore relaxation range, and the first meso-macro interconnectivity number is a ratio of an intensity of the first NMR spectrum at a meso-macro diffusional coupling to a peak intensity of the first NMR spectrum in the meso-pore relaxation range or the macro-pore relaxation range;
- acidizing the geological formation by delivering a stimulation fluid to the wellbore, thereby forming an acidized geological formation;
- recording a second NMR spectrum of the acidized geological formation over the micro-pore relaxation range, the meso-pore relaxation range, and the macro-pore relaxation range;
- calculating a second interconnectivity number by dividing a second micro-meso interconnectivity number to a second meso-macro interconnectivity number, wherein the second micro-meso interconnectivity number is a ratio of an intensity of the second NMR spectrum at a micro-meso diffusional coupling to a peak intensity of the second NMR spectrum in the micro-pore relaxation range or the meso-pore relaxation range, and the second meso-macro interconnectivity number is a ratio of an intensity of the second NMR spectrum at a meso-macro diffusional coupling to a peak intensity of the second NMR spectrum in the meso-pore relaxation range or the macro-pore relaxation range;
- and
- comparing the first interconnectivity number with the second interconnectivity number to determine the effectiveness of acidizing the geological formation.
4 more elements
Dependencies are inferred from the claim text.