US 11,668,637 B2
Joint characterization method of pore structures based on least square method and data processing method
Kun Zhang, Chengdu (CN); Shu Jiang, Wuhan (CN); Jun Peng, Chengdu (CN); Xiaoming Zhao, Chengdu (CN); Bin Li, Chengdu (CN); Lei Chen, Chengdu (CN); Pei Liu, Chengdu (CN); Xuejiao Yuan, Chengdu (CN); Fengli Han, Chengdu (CN); and Xueying Wang, Chengdu (CN)
Assigned to SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN); and CHINA UNIVERSITY OF GEOSCIENCES, WUHAN, Wuhan (CN)
Filed by Southwest Petroleum University, Chengdu (CN); and China University of Geosciences, Wuhan, Wuhan (CN)
Filed on Sep. 22, 2022, as Appl. No. 17/950,244.
Claims priority of application No. 202111120613.5 (CN), filed on Sep. 24, 2021.
Prior Publication US 2023/0096906 A1, Mar. 30, 2023
Int. Cl. G01N 15/08 (2006.01); G01N 33/24 (2006.01); E21B 49/00 (2006.01)
CPC G01N 15/0806 (2013.01) [E21B 49/005 (2013.01); E21B 2200/20 (2020.05); E21B 2200/22 (2020.05); G01N 2015/0866 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A data processing method for joint characterization of pore structures based on a least square method, comprising:
collecting test data of a target rock sample in different gas adsorption experiments; wherein the test data comprise pore sizes and pore volumes corresponding to the pore sizes respectively; and
fitting the test data in overlapping ranges of the pore sizes using the least square method, and obtaining target pore volumes corresponding to the pore sizes respectively;
wherein the fitting the test data in overlapping ranges of the pore sizes using the least square method, comprises:
calculating an average value of two the pore volumes corresponding to each of the pore sizes in the overlapping ranges, and obtaining discrete data sets (xi, yi); wherein the xi represents the pore size, and the yi represents the average value;
generating a curve according to the discrete data sets (xi, yi), and setting the curve as a fitting curve of a basic elementary function;
solving the basic elementary function by linear fitting to obtain solution results, and substituting the solution results into the basic elementary function to obtain a target basic elementary function; and
substituting the xi of the discrete data sets into the target basic elementary function to obtain the target pore volume corresponding to each the xi.