Online detection method for performance of oil displacement foams

A detection method and foam technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of complex operation, unfavorable large-scale promotion and application, and inability to guarantee, and achieve the effect of simple operation

Active Publication Date: 2016-05-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, the test accuracy of computer tomography is contradictory to the size of core samples, that is, high test accuracy cannot be guaranteed when the core samples are large; secondly, the cost of computer tomography is high and the operation is complicated , the requirements for experimental equipment and core samples are high, which is not conducive to large-scale application
In order to test the foam performance more accurately, the foam can be extracted from the rock core, and then moved to the testing instrument for observation. However, after the foam is exported, the stability is extremely poor, which is not conducive to observation, and it is difficult to obtain accurate results. the result of

Method used

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  • Online detection method for performance of oil displacement foams
  • Online detection method for performance of oil displacement foams
  • Online detection method for performance of oil displacement foams

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, according to an embodiment of the on-line detection method of the oil displacement foam performance of the present invention, the following steps may be included in sequence:

[0043] Step 1: Vacuumize the core and saturate it with water, put it into the core holder, test the water phase permeability of the core, and record the pressure change during the water flooding process;

[0044] Step 2: Inject gas and foaming agent into the core according to the gas-liquid ratio, and record the pressure change during foam flooding;

[0045] Step 3: Calculate the foam resistance factor according to the pressure when the foam flooding process is stable and the pressure during water flooding;

[0046] Step 4: Observe the shape of the foam in real time through the online foam collection room and the online foam observation device, obtain foam images at different injection times, and process the images with the help of image processing software to obtain t...

Embodiment 2

[0059] According to another embodiment of the on-line detection method of the oil displacement foam performance of the present invention, its technology, working principle, on-line detection device adopted and beneficial effect etc. are all the same as embodiment one, the difference is:

[0060] In the on-line detection device of foam performance for oil displacement, a metal pipeline is set between the inlet end of the foam line collection chamber and the outlet end of the core holder, and steel sand is filled inside the metal pipeline. The metal pipeline is very short, only 5mm, which can reduce the flow time of the foam after it leaves the core holder to a certain extent, thereby reducing the experimental error and obtaining the data information of the original foam. The outlet end of the metal pipeline and the core holder and the inlet end of the foam on-line detection device should be well sealed. Steel sand is filled inside the metal pipeline to simulate the existence of...

Embodiment 3

[0062] According to another embodiment of the on-line detection method of the oil-displacement foam performance of the present invention, its process, working principle, on-line detection device adopted and beneficial effect etc. are all the same as Embodiment 1, the difference is: in the oil-displacement foam In the online detection device of performance, the length of the inner space of the foam online collection chamber is 80 mm, the width is 30 mm, and the height is 5 μm.

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Abstract

The invention relates to an online detection method for the performance of oil displacement foams. The method includes the following steps in order: conducting vacuum pumping of saturated water to a rock core, then placing the rock core into a rock core holder, testing the water phase permeability of the rock core, and recording the pressure change of a water flooding process; injecting gas and a foaming agent into the rock core according to a gas-liquid ratio, and recording the pressure change of a foam flooding process; calculating a foam resistance factor according to the pressure of the foam flooding process in a smooth state and the pressure of water flooding; conducting real-time observation of the foam state through a foam online collection chamber and a form online observation device, acquiring the foam image and performing processing to obtain foam performance parameters; and according to the comparison result of the foam resistance factor and foam performance parameters under different schemes, selecting reasonable injection parameters. The online detection method can truly simulate the foam generation process in oil reservoir, visually observe the condition of newly generated foams in the displacement process, and acquire the original foam data information, and reaches the purpose of real-time observation of the performance of foams generated in a porous medium.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and in particular relates to an on-line detection method of foam performance for oil displacement. Background technique [0002] In the middle and late stages of reservoir exploitation, supplementing formation energy by water injection is the main measure adopted by most oilfields in my country. Due to the heterogeneity of the oil layer, there will be phenomena of "burst" and "channeling" of water in the oil layer, which will seriously affect the development effect of the oil reservoir. In order to improve the water injection effect and the recovery factor of the oil reservoir, it is necessary to take timely plugging and profile control technical measures in the oil layer. [0003] Foam flooding enhanced oil recovery is a promising tertiary oil recovery technology developed since the 1950s. Foam refers to a dispersion system formed by gas (air, nitrogen or carbon dioxide, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84
CPCG01N21/84G01N2021/8405
Inventor 李宜强孔德彬李斌会陈一航崔洺珲
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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