Rock core sampling method

A technology for core and sample selection, which is applied in the direction of solid analysis and sorting using sound waves/ultrasonic waves/infrasonic waves, and can solve the problems of core pore structure, mechanical properties that cannot be evaluated, experimental results that lack comparison, and quantitative analysis that cannot be done. Achieve the effect of simple structure, strong practicability and convenient operation
CN102183585AInactive Publication Date: 2011-09-14SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2011-09-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a rock core sampling method. The rock core sampling method sequentially comprises the following steps of: weighing and measuring rock cores to be screened; measuring each rock core by using ultrasonic waves with different frequencies, and reading time used by the ultrasonic wave permeating the rock core, head wave amplitude after butt joint of probes and head wave amplitude after the rock core is added; combining an error analysis theory to acquire the numeric range of wave impedance of each rock core; preliminarily screening the rock cores with the intersected wave impedance numeric range under different frequencies; further screening the preliminarily screened rock cores by utilizing sound wave attenuation coefficients; and finally screening the rock cores with the intersected attenuation coefficient numeric range under different frequencies. The rock core sampling method is reliable in principle, simple in structure and convenient in operation. By the method, a large number of rock cores with the same properties for a test can be preferably selected with less time and cost; physical properties, such as mass, density and the like, and internal pore space structures of the rock cores can be quantitatively analyzed; and important significance is achieved in a rock core analyzing test.
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Description

technical field

[0001] The invention relates to the field of petroleum industry, and uses ultrasonic test data of different frequencies in combination with error analysis theory, core wave impedance and ultrasonic attenuation coefficient processing to realize a method for screening rock cores with similar physical properties and pore structures. Background technique

[0002] In many core analysis tests, the same core is destroyed or its properties change after one experiment. Therefore, in order to carry out simultaneous and comparative experiments, multiple rock cores with the same properties (lithology, physical properties, structure, mechanical properties, etc.) must be prepared before the experiment. For example, triaxial mechanical experiment, acidification impact and acidification effect evaluation experiment, reservoir damage evaluation experiment, etc. However, rock is a special material with strong heterogeneity, and the development of internal pores, holes, and fr...

Claims

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