Displacement-nuclear magnetic combined measurement method and device for gas-water relative permeability curve of rock core

Abstract

The invention discloses a displacement-nuclear magnetic combined measurement method and device for a gas-water relative permeability curve of a rock core. The purpose of obtaining the gas-water relative permeability curve of the rock core through a displacement-nuclear magnetic test experiment is achieved. The displacement can reasonably simulate the gas-driven water process of different pressure stratums, the nuclear magnetism can accurately measure the distribution condition and water saturation of water in the core, and the precision is high; gas flow and water flow do not need to be measured in the whole testing process, and the testing process is improved; the novel relative permeability calculation method adopts a newly derived integral formula (2) and a newly derived integral formula (3) for calculation, the calculation result is good in stability, a curve is smooth, the regularity is high, and correction is basically not needed in the later period. The purpose of standard and accurate measurement of the gas and water relative permeability curve of the rock core is achieved. The final test result can provide basic data for gas reservoir productivity evaluation and water production dynamic analysis.

Description

technical field [0001] The invention relates to the technical field of gas reservoir development experiment analysis, in particular to a displacement-nuclear magnetic joint measurement method and device for gas-water relative permeability curves of rock cores. Background technique [0002] The gas and water phase permeability curves are the basic curves of the gas reservoir development plan, and are important parameters for gas well water production analysis and productivity evaluation. Gas-water two-phase seepage belongs to the category of multi-phase seepage, and it widely exists in the middle and late stages of gas field development. The gas-water phase permeability experiment mainly adopts the conventional method, that is, the gas flooding method, such as "Characteristics and Classification of Gas-Water Phase Permeability Curves of Tight Sandstone in Sulige Gas Field" (Luo Shunshe, Peng Yuhui, Wei Xinshan, etc.; Journal of Xi'an Petroleum University (Natural Science Edit...

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Problems solved by technology

[0002] The gas and water phase permeability curves are the basic curves of the gas reservoir development plan, and are important parameters for gas well water production analysis and productivity evaluation. Gas-water two-phase seepage belongs to the category of multi-phase seepage, and it widely exists in the middle and late stages of gas field development. The gas-water phase permeability experiment mainly adopts the conventional method, that is, the gas flooding method, such as "Characteristics and Classification of Gas-Water Phase Permeability Curves of Tight Sandstone in Sulige Gas Field" (Luo Shunshe, Peng Yuhui, Wei Xinshan, etc.; Journal of Xi'an Petroleum University (Natural Science Edition), 2015, 000(006):55-61); "Gas-water two-phase seepage experiments in carbonate reservoirs and gas well inflow dynamic curves—taking Gaoshiti——Longwangmiao Formation and Dengying Formation in Moxi Block group as an example" (Li Chenghui, Li Xizhe, Gao Shusheng, Liu Huaxun, etc.; Petroleum Exploration and Development, 2017, 44(006): 930-938); although this method is simple to operate, there is a problem of water metering, due to the small pore volume of the core , the amount of saturated water is small, and the measurement accuracy of water flow at the core outlet end is low, and it usually needs to be corrected based on experience in the later stage

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