Abstract
To improve the accuracy and efficiency of measuring fracturing proppant sphericity and roundness, a measurement scheme is designed by combining fuzzy connectedness and shape similarity. Firstly, in the proppant images collected by the microscope, according to the color characteristics of the test placement plane’s hole and proppant, the region of each proppant and that of the hole without proppant are marked separately. Secondly, based on the feature of holes without proppant, the statistical method of labeling connected components is used to only reserve all the proppant regions. Thirdly, select a part of the region of each proppant as the seed region to calculate the fuzzy connectedness map between seed regions and other regions. Fourthly, select the appropriate connectedness threshold for each proppant based on histogram of fuzzy connectedness map of each proppant region to obtain the accurate region of each proppant. Finally, the shape similarity measurement method based on Hu moment is used to determine the sphericity and roundness of each proppant by measuring the similarity between the region of each proppant and that of 20 particles in the standard template. The experimental results show that the proposed scheme is consistent with manual measurement flow, and can avoid the human labor, meanwhile, the accuracy of measurement is basically consistent with the results of manual measurement.
Highlights
Fracturing proppant is a kind of granular product and mostly sintered from ceramic materials
The fuzzy connectedness map has been accomplished based on many candidate seed regions which are generated by some pre-processing procedures including color characteristics thresholds and connected component labeling
The method of shape similarity measurement based on Hu moment has been used to find the most similar particle from 20 particles of the standard template, and the corresponding sphericity and roundness are used as that of the proppant
Summary
Fracturing proppant is a kind of granular product and mostly sintered from ceramic materials. Fracturing proppant has high fracturing strength and is widely used in deep well and high-pressure oil and gas reservoir fracturing. During deep oil and gas production, the high-close-pressure low-permeability ore deposits are fractured and the oil-bearing rock layers are fractured. Fracturing proppant is used to enter the formation with a high-pressure solution to fill the cracks in the rock formation. The fracturing proppant supports the cracks without closing by stress release and plays an important role in increasing production by maintaining high conductivity and allowing oil and gas to flow smoothly. It has been proved that the oil well with fracturing proppant increases the production by 30-50% and extends the service life of oil and gas wells [1]
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