Method for improving computed tomography (CT) measured fluid saturation precision

A technology of saturation and precision, which is applied in the field of accurate measurement of fluid saturation by CT, can solve the problems of sensitive damage, cumbersome experiment process, etc., and achieve the effect of reducing operation steps and improving accuracy
CN102183532AActive Publication Date: 2011-09-14PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2011-09-14

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Abstract

The invention relates to a method for improving computed tomography (CT) measured fluid saturation precision. The method comprises the following steps of: a, performing CT scanning on a dry core sample inside and outside a core holder respectively to acquire CT values; b, performing CT scanning on a core of complete saturated brine inside and outside the core holder respectively to acquire CT values; c, making bound water by using the core in the holder, measuring the CT value of the core in a bound water state, and calculating the saturation of the bound water according to the water or liquid outlet volume after the bound water is made completely; d, performing CT scanning on brine for saturation, oil for experiments and peripheral air respectively to acquire CT values, wherein the CT value of the air is a constant value in any medium; e, calculating the CT value of the brine and the CT value of the oil in the core holder by using formulas III and V; and f, calculating the oily watersaturation in the displacement process by using the formula V according to the corrected brine and oil CT values acquired in the step e, wherein the relative error of the saturation is within 1 percent.
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Description

technical field

[0001] The invention relates to a method for testing rock core fluid saturation, in particular to a CT method for accurately measuring fluid saturation. Background technique

[0002] As a routine testing technique in core analysis, CT technology is widely used in core description, core heterogeneity determination, core sample selection, fracture quantitative analysis, online saturation measurement, flow experiment research, etc. The use of CT to measure fluid saturation in rocks has become one of the most common and effective experimental methods for CT technology in the petroleum industry.

[0003] The basic principle of CT scanning of rocks is: the X-ray beam generated by the X-ray tube in the CT machine is irradiated from multiple directions along a selected fault layer of the object. By measuring the amount of transmitted X-rays, it is calculated after digitization. These absorption coefficients can form different digital matrices; through the digital-to...

Claims

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