Method for measuring in-situ mechanical properties of gel particles

A technology of gel particles and mechanical properties, applied in the field of measuring the in-situ mechanical properties of gel particles, can solve the problems of uneven force, time-consuming, and cannot be used as a conventional performance evaluation method, and achieves the effect of a wide range of applicable objects.

Active Publication Date: 2019-12-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventors found that the method has the following problems: (1) the dispersion medium has a great influence on the measurement result, and the measurement value is related to the system concentration; (2) in the dispersion system, there is interaction between the particles, which interferes with the measurement; (3) Uneven particle size distribution and irregular particle shape lead to uneven force between the two flat plate fixtures; (4) The distance between the two flat plates (clamp distance) has a great influence on the measurement results; (5) When measuring Firstly, the linear viscoelastic region needs to be determined by strain scanning, and the test process takes a long time
[0011] It can be seen that this method is tested for sheet samples prepared by a specific method, which has limitations and cannot be used as a routine performance evaluation method
In addition, this method actually measures the elasticity and strength of the bulk gel, and after the bulk gel is crushed into gel particles, the mechanical environment of the particles is very different from that of the bulk gel, so this method cannot truly reflect the gel. In situ mechanical properties of colloidal particles
At present, there is still a lack of a method that can quickly and accurately measure the mechanical properties of gel particles in situ

Method used

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  • Method for measuring in-situ mechanical properties of gel particles
  • Method for measuring in-situ mechanical properties of gel particles
  • Method for measuring in-situ mechanical properties of gel particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment mainly tests the modulus of elasticity of gel particle oil displacement agent PPG, comprises the steps:

[0045] (1) Preparation of PPG dispersion system:

[0046]Accurately weigh 5g of PPG oil displacement agent sample (100-150 mesh), accurate to 0.0001g. Weigh 1L of simulated formation water into a 2000mL beaker. The formation water is composed of the following components and their contents: sodium sulfate 69.6ppm, sodium chloride 6191ppm, anhydrous calcium chloride 241.4ppm, magnesium chloride hexahydrate 351.4ppm, and the rest ionized water. Turn on the constant speed stirrer and slowly add the sample along the wall of the vortex at 400r / min for 30s, then stir at a stirring rate of 500r / min for 2 hours, the PPG is fully swollen and a dispersed system is formed.

[0047] (2) Separation of PPG gel particles:

[0048] Take a funnel, put the folded filter paper into the funnel and moisten it with simulated formation water to ensure that the filter pap...

Embodiment 2

[0056] In this example, the elastic modulus of the viscoelastic particles with a solid core structure of fly ash is tested. The sample size of the viscoelastic particles with a solid core structure of fly ash is 100-150 mesh. The preparation of the dispersion system, the separation and fixation of the viscoelastic particles, etc. Same as example 1, the instrument used is Hisilicon TI 980 TriboIndenter nano-indenter, firstly use SPM in-situ imaging technology to obtain the morphology of the sample to be tested, and determine the position of the indentation test point. Select the Berkovich diamond indenter, use the quasi-static indentation method to conduct nano-indentation test on the gel particles, select the load control mode, the maximum load is 120mN, the loading and unloading time is 25s, and the holding time at the maximum load is 10s. Start the indentation test, and obtain the force-displacement curve of displacement changing with load.

[0057] The data processing metho...

Embodiment 3

[0059] In this example, the plastic parameters and elastic modulus of the viscoelastic particles with a solid core structure of wood fibers are tested. The sample size of the viscoelastic particles with a solid core structure of wood fibers is 100-150 mesh, the preparation of the dispersion system, the separation and fixation of the viscoelastic particles, etc. The operation is the same as in Example 1, and the instrument used is Hisilicon TI 980 TriboIndenter nano-indenter. First, the SPM in-situ imaging technology is used to obtain the morphology of the sample to be tested, and the position of the indentation test point is determined. Select the Berkovich diamond indenter, use the quasi-static indentation method to conduct nano-indentation test on the gel particles, select the load control mode, the maximum load is 110mN, the loading and unloading time is 30s, and the holding time at the maximum load is 5s. Start the indentation test, and obtain the force-displacement curve o...

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Abstract

The invention belongs to the field of profile control and water plugging of oil-water wells, and particularly relates to a method for measuring in-situ mechanical properties of gel particles. The method comprises the following steps: (1) pretreating gel particles; (2) performing an in-situ mechanical property test on the gel particles pretreated in the step (1) by using a nanoindentor; and (3) carrying out data processing and analysis. The method can be used for directly, quickly and accurately measuring in-situ mechanical properties such as elasticity modulus, contact rigidity and plasticityparameters of the gel particles. The method disclosed by the invention is wide in application range, and artificial gel particles and biological gel particles can be measured by adopting the method disclosed by the invention.

Description

technical field [0001] The invention belongs to the field of profile control and water shutoff of oil-water wells, and in particular relates to a method for measuring in-situ mechanical properties of gel particles. Background technique [0002] At present, most oilfields in my country have entered the stage of high water-cut oil production. Due to the long-term influence of hydrodynamic geological effects, the formation heterogeneity has intensified and fractures have developed, resulting in serious water channeling and water flooding, leading to premature water breakthrough in oil wells. For the above problems, major oilfields have begun to use gel particles as control and displacement agents for extraction operations. [0003] The gel particle (microsphere) control and displacement agent is a water-absorbing volume expansion material, which is non-absorbent to oil, and the gel volume shrinks in the oil. The gel particles have good viscoelasticity after absorbing water. Whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/42G01Q30/20G01Q60/00G01B15/06
CPCG01N3/42G01Q30/20G01Q60/00G01B15/06
Inventor 季岩峰祝仰文王其伟曹绪龙窦立霞赵方剑徐辉庞雪君何冬月董雯
Owner CHINA PETROLEUM & CHEM CORP
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