Long core holder realizing multi-pairwise-point radial measurement

Abstract

The invention discloses a long core holder realizing multi-pairwise-point radial measurement. The long core holder comprises a holder barrel, a rubber sleeve, a core chamber bracket, a plug system, ameasuring system and a confining pressure pump, wherein an annular confining pressure cavity is formed between the holder barrel and the rubber sleeve and is wrapped by the rubber sleeve to form a core chamber, and the core chamber bracket is arranged at the bottom of the core chamber; the plug system comprises an inlet end plug and an outlet end plug located at two ends of the holder; the measuring system comprises insulating sleeves, saturation probes and radial measuring points; small holes are oppositely formed in the surface of the holder barrel in a radial direction; the insulating sleeves are matched with the radial measuring points, the saturation probes are arranged in the insulating sleeves and are connected with a long core after passing through the rubber sleeve, and the confining pressure pump is communicated with the confining pressure cavity through the pipe via an annular pressure hole in the holder barrel. The holder simulates formation conditions of oil and gas reservoirs, and can realize real-time measurement of multi-point radial resistivity, and the distribution position and law of residual oil in the core can be defined by detecting the resistivity change curve with an itinerant detector and a resistivity tester.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas experiments, and relates to a measuring system for remaining oil and gas distribution, in particular to a long core holder for measuring the resistivity of long cores radially with multiple pairs of points. Background technique [0002] At present, most oil and gas reservoirs in the country and even in the world have entered the late stage of development, and tapping the potential of remaining oil and gas has always been a hot and difficult point in the oil and gas industry. Reservoir numerical simulation technology is an important means for tapping the potential of remaining oil and gas. It is based on sufficient geological and oil and gas data, but the current technical conditions cannot be met. The pressure drop test technology during the dull well after water injection is used on site. This technology is based on the material balance principle and combines multiple rounds of well test data to s...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a long core holder for radially measuring the resistivity of rock cores with multiple pairs of points, and to measure the radial resistivity of long rock cores through multiple pairs of points, so as to solve the problem that the existing resistivity instrument core holders cannot measure water drive. The limitations of oil-water distribution along the length of the core during the oil process

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