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Pore micron-sized oil water distribution recognition and quantification method

A quantification method and micron-level technology, which is applied in measurement, earthwork drilling, mining fluid, etc., can solve the problems of lack of intuitive and effective test and evaluation methods, and achieve simple and reliable sample preparation, reliable principle, and good adaptability

Inactive Publication Date: 2014-08-13
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a quantitative method for identifying and quantifying oil-water distribution in pores at the micron level, which is used to solve the lack of an intuitive and effective test and evaluation method that can quantitatively describe the oil-water distribution and remaining oil in the oil reservoir rock pore size level in the current oilfield development and tertiary oil recovery process question

Method used

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  • Pore micron-sized oil water distribution recognition and quantification method
  • Pore micron-sized oil water distribution recognition and quantification method
  • Pore micron-sized oil water distribution recognition and quantification method

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Experimental program
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Embodiment 1

[0071] First, artificial quartz sandstone cores were selected to prepare empty core slices to ensure the accuracy of pore structure analysis, and experiments were carried out according to the experimental procedures to ensure the quantitative analysis of pore oil-water distribution at different stages. The specific methods are as follows:

[0072] (1) Slice on the new core, perform scanning analysis, obtain the original pore structure parameters of the artificial core, analyze the pore structure characteristics of the artificial core before use, and use it for comparison with the parameters obtained by scanning the core in the next oil displacement experiment; the oil displacement process After the completion of different oil displacement stages, core samples were cut from both ends of the core, scanned and analyzed to analyze the influence of different oil displacement processes on the core pore structure.

[0073] (2) Configure experimental water, add calibration agent, satur...

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Abstract

The invention relates to a pore micron-sized oil water distribution recognition and quantification method. A flooding experiment scheme is firstly designed according to the research purpose, in different chemical flooding phases, iodide ions serving as a scanning standardizing reagent are added to a displacement chemical reagent, after each chemical flooding phase is over, a test sample is prepared, then an X ray scanning test is carried out, a scanning result is calculated and analyzed and automatically recorded by a computer, an X ray gray level distribution data graph obtained by scanning is transmitted to a data processing workstation unit of a microcosmic scanning system to be subjected to two-dimensional image reconstruction, gray level recognition and pore interior oil water distribution computing, so that core pore parameters and core pore interior oil water actual distribution image and quantification proportion are obtained. According to the invention, the sample preparation is simple and reliable, no damage is caused to the rock structure, the oil water distribution states in pores of a natural core and an artificial core in different chemical flooding phases are effectively reflected, the quantitative description is also provided, and the applicability of test results is good.

Description

1. Technical field: [0001] The invention relates to an indoor test and evaluation method for reservoir pore structure parameters and residual oil distribution in pore media and quantitative description during oilfield development and reservoir description, and specifically relates to a method for identifying and quantifying pore micron-level oil-water distribution. 2. Background technology: [0002] Remaining oil refers to the formation crude oil that has not been recovered in the current oilfield development and tertiary oil recovery technology. It is the research object of tertiary oil recovery and enhanced recovery technology at home and abroad. Methods such as macroscopic simulation analysis and microscopic visual analysis have failed to provide a quantitative description of the remaining oil and an intuitive oil-water distribution relationship at the pore size level (the pore radius distribution range of major sandstone oilfields in China is: 0.1-10 microns). X-ray scan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00E21B49/00E21B43/22
Inventor 马文国夏惠芬刘义坤吴文祥王克亮王影
Owner NORTHEAST GASOLINEEUM UNIV
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