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Capillary pressure curve classification method

A capillary pressure curve and classification method technology, applied in the field of capillary pressure curve classification, can solve the problems of not considering the similarity of the curve, except for the accuracy, speed and flexibility of the classification of the capillary pressure curve, so as to achieve maximum flexibility and ensure similarity effect

Active Publication Date: 2020-05-22
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the classification of capillary pressure curves in the prior art is only based on the characteristic parameters, without considering the similarity of the overall shape of the curves, in addition to reducing the accuracy, speed and flexibility of capillary pressure curve classification

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  • Capillary pressure curve classification method

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Embodiment 1

[0030] A method for classifying capillary pressure curves. First, the capillary pressure curve is fitted to determine the number of pore systems N and the displacement pressure P reflected by the capillary pressure curve. d , and according to P d sort the curves; then compare the similarity of any two curves to ensure that the two curves have the same N value, and calculate the absolute value of the saturation difference corresponding to the two capillary pressure curves one by one, if all points If the saturation difference values ​​of the two curves are both smaller than the allowable error, the two curves are classified into the same category.

[0031] In the method, all the original capillary pressure curves are fitted one by one by formula (1), and the number of pore systems N and the displacement pressure P reflected by each curve are determined. d ;

[0032] (1)

[0033] In the formula:

[0034] P c — mercury injection pressure (bar or Mpa);

[0035] S w —wate...

Embodiment 2

[0046] The capillary pressure curve is the curve of fluid saturation (wetting phase or non-wetting phase) changing with pressure, which is closely related to the pore structure characteristics of rocks. For two similar capillary pressure curves, under the same pressure conditions, the fluid saturations corresponding to the two curves should be very similar. If the fluid saturation differs greatly, it means that the two curves are not similar and reflect different pore structures. feature. The method for automatically classifying capillary pressure curves proposed by the present invention allows each curve to be compared with all other curves for a similarity through a double iterative cycle method, and ensures that curves of the same type have the same N value. After the automatic classification is completed, each curve has a category attribute value (GP) assigned an integer, and the same attribute value belongs to the same category.

[0047] Based on this principle, the auto...

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Abstract

The invention discloses a capillary pressure curve classification method. The capillary pressure curve classification method comprises the following steps: firstly, fitting a capillary pressure curve,determining pore system number N and displacement pressure Pd reflected by the capillary pressure curve, and sequencing the curve according to the size of the Pd; and then comparing the similarity ofany two curves, guaranteeing that the two curves have the same N value, calculating the absolute value of the saturation difference value corresponding to the two capillary pressure curves from pressure points one by one, and dividing the two curves into the same class if the saturation difference value of all the points is less than allowable error. By the capillary pressure curve classificationmethod, the similarity of the integral shapes of the curves is guaranteed, the classification precision is adjusted according to requirements and high flexibility is achieved.

Description

technical field [0001] The invention relates to a method for classifying capillary pressure curves, which is used for quantitative analysis of capillary pressure curves in porous media, and belongs to the field of reservoir rock pore structure evaluation. Background technique [0002] For the study of reservoir rock pore structure, capillary pressure experiment is the basis for studying throat size, and different morphological characteristics of capillary pressure curves reflect different pore structure characteristics of rocks. In reservoir evaluation, reservoirs are often classified according to the morphological characteristics of capillary pressure curves, so as to improve the accuracy of reservoir evaluation. Therefore, accurate classification of capillary pressure curves is the basis of reservoir classification evaluation. [0003] The traditional capillary pressure curve classification methods almost all use P d (displacement pressure), R35 (throat radius correspond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 陈明江韩翀黄婷婷
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD