A new method of gas reservoir evaluation based on neutron cross section logging

Natural fracture is a geological phenomenon widely distributed in tight formation, and fractured gas reservoir stimulation effect mainly depends on the communication of natural fractures. Therefore it is necessary to carry out the evaluation of this reservoir and to find out the optimal natural fractures development wells. By analyzing the interactions and nonlinear relationships of the parameters, it establishes three-level index system of reservoir evaluation and proposes a new method for gas well reservoir evaluation model in fractured gas reservoir on the basis of fuzzy logic theory and multilevel gray correlation. For this method, the Gaussian membership functions to quantify the degree of every factor in the decision-making system and the multilevel gray relation to determine the weight of each parameter on stimulation effect. Finally through fuzzy arithmetic operator between multilevel weights and fuzzy evaluation matrix, score, rank, the reservoir quality, and predicted production will be gotten. Result of this new method shows that the evaluation of the production coincidence rate reaches 80%, which provides a new way for fractured gas reservoir evaluation.

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Investigation of the total neutron cross section for natural hafnium on the filtred neutron beam with energy 59 keV

Scientific Herald of Uzhhorod University Series Physics ◽

10.24144/2415-8038.2011.30.142-147 ◽

2011 ◽

Vol 30 (0) ◽

pp. 142-147

Author(s):

О. О. Грицай ◽

А. К. Гримало ◽

В. В. Колотий ◽

В. М. Венедиктов ◽

С. П. Волковецький ◽

...

Keyword(s):

Cross Section ◽

Neutron Beam ◽

Neutron Cross Section ◽

Total Neutron ◽

Total Neutron Cross Section

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A New Method for Predicting Good Drilling Location in South Sulige Tight Sand Gas Field through Joint Geophysics, Geology and Gas Reservoir Integrated Study

10.2523/19191-ms ◽

2019 ◽

Author(s):

Qian Hao ◽

Jiping Wang ◽

Dong Han ◽

Wuke Li ◽

Changbao Liang ◽

...

Keyword(s):

New Method ◽

Gas Reservoir ◽

Gas Field ◽

Tight Sand Gas ◽

Integrated Study

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Measurement of the Ratio of Neutron Cross-Section to Proton Cross-Section in Muon Deep Inelastic Scattering at 490-GeV/c

10.2172/1426692 ◽

1991 ◽

Author(s):

Silhacene Aid

Keyword(s):

Inelastic Scattering ◽

Deep Inelastic Scattering ◽

Cross Section ◽

Neutron Cross Section

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The Power Losses in Cable Lines Supplying Nonlinear Loads

Energies ◽

10.3390/en14051374 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1374

Author(s):

Bartosz Rozegnał ◽

Paweł Albrechtowicz ◽

Dominik Mamcarz ◽

Monika Rerak ◽

Maciej Skaza

Keyword(s):

Bessel Function ◽

Cross Section ◽

Power Loss ◽

Sine Wave ◽

Active Power ◽

New Method ◽

Power Losses ◽

Nonlinear Loads ◽

Current Harmonics ◽

Cable Lines

This paper presents the skin effect impact on the active power losses in the sheathless single-core cables/wires supplying nonlinear loads. There are significant conductor losses when the current has a distorted waveform (e.g., the current supplying diode rectifiers). The authors present a new method for active power loss calculation. The obtained results have been compared to the IEC-60287-1-1:2006 + A1:2014 standard method and the method based on the Bessel function. For all methods, the active power loss results were convergent for small-cable cross-section areas. The proposed method gives smaller power loss values for these cable sizes than the IEC and Bessel function methods. For cable cross-section areas greater than 185 mm2, the obtained results were better than those for the other methods. There were also analyses of extra power losses for distorted currents compared to an ideal 50 Hz sine wave for all methods. The new method is based on the current penetration depth factor calculated for every considered current harmonics, which allows us to calculate the precise equivalent resistance for any cable size. This research is part of our work on a cable thermal analysis method that has been developed.

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