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Method of Determining Distribution and Migration Law of Remaining Oil in Chemical Flooding Using Fractal Theory

A technology of remaining oil and chemical flooding, applied in image analysis, earthwork drilling, image data processing, etc.

Inactive Publication Date: 2021-08-03
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problems mentioned in the background technology, the present invention provides a method of using fractal theory to determine the distribution and migration of remaining oil in chemical flooding. This method applies fractal theory to the field of remaining oil distribution research. Quantitatively determine the distribution and migration of remaining oil in chemical flooding by box dimension, so as to overcome the defects in the existing technology

Method used

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  • Method of Determining Distribution and Migration Law of Remaining Oil in Chemical Flooding Using Fractal Theory
  • Method of Determining Distribution and Migration Law of Remaining Oil in Chemical Flooding Using Fractal Theory
  • Method of Determining Distribution and Migration Law of Remaining Oil in Chemical Flooding Using Fractal Theory

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with accompanying drawing:

[0042] Step 1: Microscopic visual model preparation

[0043] Use exposure technology to transfer the designed reservoir pore structure to a glass plate coated with photosensitive adhesive and develop it, and then use hydrofluoric acid etching to etch the developed part into a pore structure with a certain depth, while other parts are etched by photolithography. Glue and wax protect it from corrosion, and finally a coverslip is applied so that a microscopic model for visual displacement is obtained.

[0044] Step 2: Put the microscopic physical model obtained in step 1 into the microscopic oil displacement device to conduct microscopic oil displacement experiments, and collect images of the compound displacement process

[0045] The experimental steps are as follows:

[0046] (1) Clean the microscopic simulation glass etching model with petroleum ether, ethanol, and distille...

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Abstract

A method for determining the distribution and migration of remaining oil in chemical flooding using fractal theory. The main purpose is to overcome the shortcoming that the research method of remaining oil migration law is too single, and the present invention proposes a method for determining the distribution and migration law of chemical flooding remaining oil by using fractal theory. The specific solution is: make a microscopic physical model, conduct a chemical flooding experiment through a microscopic oil displacement device, collect continuous images of the seepage process, divide the displacement range according to the actual situation, remove the actual pore skeleton through image processing, and extract the complete remaining Oil distribution form, calculate the dimension of the remaining oil meter box in the grid according to the partition grid, summarize the change curve of the meter box dimension of the same grid and adjacent grids, compare the change law of the meter box dimension of adjacent grids, and determine the chemical flooding Distribution and migration rules of remaining oil.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a device and method for studying the distribution law of remaining oil based on fractal theory. Background technique [0002] With the continuous deepening of oilfield development, most domestic oilfields have entered the "double high" stage of high water cut and high recovery degree. It is very important to know the remaining oil to provide an important basis for secondary and tertiary oil recovery. Residual oil is divided into two categories: macroscopic residual oil and microscopic residual oil. At present, the microcosmic studies on remaining oil are more focused on the microcosmic displacement mechanism and the distribution of remaining oil. More microscopic visual models are used. Although intuitive, multi-regions flow simultaneously during the displacement process, and the migration law appears abstract. There is a lack of methods to determine the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G06T7/136G06T7/194
CPCE21B49/00G06T7/136G06T7/194
Inventor 皮彦夫刘丽刘金鑫戴志鹏郭轩
Owner NORTHEAST GASOLINEEUM UNIV