Multi-capillary force curve averaging method based on multi-sample overall virtual measurement

Abstract

The invention relates to a multi-capillary force curve averaging method based on multi-sample overall virtual measurement, which comprises the following steps of 1, obtaining m rock samples, and obtaining a capillary force-saturation curve, appearance volume and porosity of each sample; 2, checking the capillary force-saturation curve quality of each sample, and pre-treating curve endpoints; 3, calculating the average wet phase saturation corresponding to different capillary force values of a plurality of samples under overall virtual measurement; and 4, marking data points on a graph by taking the wet phase saturation as a horizontal coordinate and the capillary force as a vertical coordinate, and smoothly connecting all the data points to obtain an averaged capillary force curve. The method is reliable in principle, easy and convenient to operate, suitable for various types of samples with different physical properties, wide in application range, accurate and convenient in calculation result and capable of better meeting the actual working condition, and operation is directly conducted on the capillary force curve, and the influence of the reservoir number represented by the sample is considered.

Description

technical field [0001] The present invention relates to the averaging method of capillary force curves in the process of measuring capillary force in the field of oil and gas field development, geotechnical engineering and other seepage mechanics, in particular to the averaging method of multiple capillary force curves with different reservoirs represented by samples or significantly different J functions method. Background technique [0002] Capillary force is an important force for seepage in oil and gas reservoirs, and the capillary force curve is the basic parameter for oil and gas reservoir development. Capillary force is particularly sensitive to pore size, pore shape, pore structure, rock and mineral properties, fluid properties, temperature and pressure, seepage environment, etc., so different samples generally have obvious differences in capillary force curves, even for the same sample, different tests are also different. It is difficult to obtain the same capillar...

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Problems solved by technology

The limitations of this type of method are: (1) It is not suitable for the situation where the J function of different samples is significantly different; (2) The interpolation of the J function lacks strict physical meaning, there are many interpolation methods, and the results of different methods are quite different. The construction of the interpolation method has a strong subjectivity; (3) most of these methods cannot consider the influence of the number of samples

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