A Quantitative Analysis Method for Visible Flooding of Core Thin Sections
A quantitative analysis and thin section technology, applied in the field of oilfield scientific research and experiments, can solve the problem of inability to quantitatively express the interface velocity of two-phase flooding, and achieve the effect of good fluidity
Inactive Publication Date: 2017-01-11
CHANGZHOU UNIV
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Problems solved by technology
[0003] The purpose of the present invention solves the problem that the velocity of the two-phase displacement interface near the pore throat cannot be quantitatively expressed in the oil field EOR displacement experiment, and provides a quantitative analysis method for visual displacement of thin core slices
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[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0024] Such as figure 1 with figure 2 As shown, the device of the present invention includes a nitrogen cylinder 1, a nitrogen purification device 2, a displacement liquid tank 3, a pressure gauge 4, a core slice 5, a metal frame 6, a silicone sleeve 7, a pillar 8, a heating system 9, and a macro lens 10 , CCD camera 11, double pulse laser 12, synchronizer 13, computer 14, infrared transmitter 15, infrared receiver 16, capillary glass tube 17, photoelectric micro flow meter 18, capillary glass tube support 19, vernier caliper 20, timer...
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Abstract
The invention discloses a method for quantitatively analyzing core slice visualized displacement. The method includes the following steps: firstly, the core slice is saturated with to-be-displaced medium; a displacing liquid tank is filled with displacing liquid; a valve is opened, and the flow is adjusted, wherein the micro flow in the system is read by a micro photoelectric meter; the focal length and aperture of a micro lens are adjusted, and the laser spot of a dual-pulse laser is adjusted to ensure that a clear image of the pore in the core slice is formed in a computer; when the gas-liquid two-phase interface or the liquid-liquid two-phase interface appears at the pore throat of the core slice, a synchronizer controls the dual-pulse laser and a CCD camera to work simultaneously, and a computer program determines and reads the displacements of two consecutive gas-liquid two-phase interfaces or liquid-liquid two-phase interfaces on the basis of correlation theories; within the given time interval, the speed and direction of the two-phase interface at the pore throat are calculated. The method provided by the invention can accurately measure the speed and direction of the gas-liquid or liquid-liquid displacement two-phase interface at the pore throat in a real core, and can provide preferable technical parameters for the research on improving the recovery ratio of oil fields.
Description
technical field [0001] The invention belongs to the field of oil field scientific research experiments, and in particular relates to a quantitative analysis method for visual displacement of rock core thin slices which can be applied to the quantitative evaluation of oil displacement experiments for enhanced oil recovery in oil fields, and can be used for related experiments such as water flooding and gas flooding. Background technique [0002] In the field of oilfield scientific research experiments, the existing EOR displacement experiments are divided into four types: (1) glass etching model displacement experiments; (2) sand simulated core displacement experiments; (3) cylindrical core displacement experiments (4) Core thin-section displacement experiment, in which the core thin-section displacement experiment is a new type of displacement experiment scheme, but the current core thin-section displacement experiment can only qualitatively display the two-phase displacement...
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IPC IPC(8): G01N33/24
Inventor 王小兵孙然赵会军
Owner CHANGZHOU UNIV