Averaging method of multiple capillary force curves based on multi-sample overall virtual measurement
A technology of virtual measurement and capillary force, which is applied in measuring devices, surface tension analysis, instruments, etc., can solve the problems that the influence of sample quantity cannot be considered, interpolation lacks physical meaning, etc., and achieve the effect of clarifying physical meaning
Active Publication Date: 2022-04-15
SOUTHWEST PETROLEUM UNIV
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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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[0041] The present invention will be further described below according to the accompanying drawings, so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of specific implementations. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, they are all within the scope of protection. List.
[0042] In the present invention, the subscript w represents the wet phase fluid; the subscript n represents the non-wet phase fluid; p c Indicates capillary force; S indicates saturation, S w Indicates the wet phase saturation; V b Indicates the apparent volume of the rock sample; φ indicates the porosity of the sample. The variable m indicates the number of samples; the superscript j indicates sample number j.
[0043] see figure 1 . Taking the oil-water two-phase capilla...
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The present invention relates to the method for averaging multi-capillary force curves based on multi-sample overall virtual measurement, comprising: the first step, obtaining m kinds of rock samples, and obtaining the capillary force-saturation curve, apparent volume and porosity of each sample; second The first step is to check the quality of the capillary force-saturation curve of each sample and preprocess the endpoints of the curve; the third step is to calculate the average wet phase saturation corresponding to different capillary force values of multiple samples under the overall virtual measurement; In four steps, take the wet phase saturation as the abscissa and the capillary force as the ordinate, mark the data points on the graph, connect all the data points smoothly, and obtain the averaged capillary force curve. The invention is reliable in principle, easy to operate, directly operates on the capillary force curve, considers the influence of the number of reservoirs represented by the sample, is suitable for various types of samples with different physical properties, has a wide range of applications, accurate and convenient calculation results, and is more in line with actual work. condition.
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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IPC IPC(8): G01N13/00G01N13/02
CPCG01N13/00G01N13/02G01N33/24G01N15/08G01N15/0806
Inventor 彭小龙朱苏阳王超文邓鹏贾春生费冬吴昊强叶泽禹张斯
Owner SOUTHWEST PETROLEUM UNIV