King Fahd University of Petroleum and Minerals

Karem Al-Garadi

Mohamed Mahmoud

Mahmoud Elsayed

Ammar El-Husseiny

Muhammad Shahzad Kamal

A method for predicting formation permeability by measuring diffusional tortuosity in several directions by pulse gradient NMR. The method comprises evaluating an anisotropic diffusion coefficient by pulsed gradient NMR, determining diffusional tortuosity from the restricted diffusion data, supplementing the NMR results with resistivity and sonic logging data, measuring anisotropic tortuosity and porosity by resistivity and sonic data and combining all components in a single fitting model. The 11-coefficient model is trained to recognize the true values of permeability by comparing the real oil permeabilities measured. in a library of oil-carrying rock cores with the NMR, resistivity and sonic correlates The fitting coefficients are extracted by minimizing the discrepancy between the laboratory measured permeabilities and the predicted values combining all rapid logging information components with the agreement-maximizing weights.

Method for downhole determination of permeability anisotropy using NMR

A method for predicting formation permeability by measuring diffusional tortuosity in several directions by pulse gradient NMR. The method comprises evaluating an anisotropic diffusion coefficient by pulsed gradient NMR, determining diffusional tortuosity from the restricted diffusion data, supplementing the NMR results with resistivity and sonic logging data, measuring anisotropic tortuosity and porosity by resistivity and sonic data and combining all components in a single fitting model. The 11-coefficient model is trained to recognize the true values of permeability by comparing the real oil permeabilities measured in a library of oil-carrying rock cores with the NMR, resistivity and sonic correlates. The fitting coefficients are extracted by minimizing the discrepancy between the laboratory measured permeabilities and the predicted values combining all rapid logging information components with the agreement-maximizing weights.

Downhole method for determining geologic permeability

Method for determining permeability in a hydrocarbon formation

NMR method for determining permeability in geologic formation

Measurement method for determining resistivity and permeability in a borehole

A method for assessing an optimal acid injection rate in the process of hydrocarbon formation stimulation. The method comprises evaluating an anisotropic diffusion coefficient by pulsed gradient NMR, introduction of a semi-empirical correction based on comparison of the downhole conditions with the library of laboratory experiments where such corrections were measured, extrapolation of the library data to the real downhole conditions. The improved values of the diffusion coefficients are applied in determining wormhole regime conditions that are optimal in terms of acid consumption per a unit of stimulated yield of the hydrocarbon.

Method for acid fracturing and acid stimulation based on NMR diffusion measurements

Method for evaluation of permeability anisotropy using NMR diffusion measurements for oil and gas wells

A method for rapid wettability evaluation during exploratory drilling of a hydrocarbon. The method include pre-saturation of the sample by a brine, measuring the bulk brine's TNMR relaxation parameter, expelling the brine by oil in the sample, measuring the oil's bulk and pore TNMR relaxation parameter, measuring the brine's non-reducible content and TNMR relaxation parameter of water in the presence of dominant oil content, expelling the oil by the brine and measuring the TNMR relaxation parameter of the irreducible oil content in the dominant brine. The measurements are combined in the index:=[()/]&#x2212;[()/],

Growing community of inventors

Dhahran, Saudi Arabia

Karem Al-Garadi