A kind of composite nano-coated oil-displacing agent particle and preparation method thereof

An oil-displacing agent and composite technology, which is applied in the field of composite nano-coated oil-displacing agent, can solve the problems of poor salt resistance, temperature resistance and shear resistance, unable to achieve the expected target, low efficiency, etc., and achieves fast reaction speed. , No residue of highly toxic reactants, the effect of easy availability of raw materials

Active Publication Date: 2022-07-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the chemical flooding of the oil recovery method, the oil displacement agent polymers and surfactants mainly used in the initial stage of injection will cause a large amount of oil displacement agents to be consumed in the invalid zone where the residual oil saturation concentration is low in the near wellbore area due to shearing and adsorption, which cannot be achieved. Estimated target, less efficient
The polymer commonly used in my country's Daqing Oilfield is ultra-high molecular weight partially hydrolyzed polyacrylamide, which has been successful, but there are still problems such as poor salt resistance, temperature resistance and shear resistance.

Method used

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  • A kind of composite nano-coated oil-displacing agent particle and preparation method thereof
  • A kind of composite nano-coated oil-displacing agent particle and preparation method thereof
  • A kind of composite nano-coated oil-displacing agent particle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) adding the oil-displacing agent to water and ultrasonically, until the oil-displacing agent is completely dissolved to obtain a clear liquid, which is used as the water phase;

[0080] (2) dissolving the coating material in methylene chloride, and adding Span 80, as oil phase;

[0081] (3) place the oil phase in an ice bath and use a high-speed disperser to homogenize it, at the same time, use a dropper to drop the water phase into the oil phase, and the dropwise addition ends in 2min, and after the dropwise addition ends, continue to homogenize 3 times, each homogenization time is 3min, after the homogenization is completed, the colostrum is obtained, and the colostrum obtained after homogenization is transferred to an ultrasonic machine for ultrasonication;

[0082] (4) under ice bath condition, add 2wt% PVA aqueous solution dropwise to the colostrum after ultrasonic in step (3) within 3min and carry out ultrasonic at the same time, such as figure 2 wherein, the...

Embodiment 2

[0091] (1) adding the oil-displacing agent to water and ultrasonically, until the oil-displacing agent is completely dissolved to obtain a clear liquid, which is used as the water phase;

[0092] (2) dissolving the coating material in methylene chloride, and adding Span 80, as oil phase;

[0093] (3) place the oil phase in an ice bath and use a high-speed disperser to homogenize it, at the same time, use a dropper to drop the water phase into the oil phase, and the dropwise addition ends in 2min, and after the dropwise addition ends, continue to homogenize 3 times, each homogenization time is 3min, after the homogenization is completed, the colostrum is obtained, and the colostrum obtained after homogenization is transferred to an ultrasonic machine for ultrasonication;

[0094] (4) adding 2wt% PVA aqueous solution dropwise to the sonicated colostrum in step (3) within 3 min under ice bath conditions and performing ultrasonication at the same time; wherein, the sonicated colos...

Embodiment 3

[0103] (1) adding the oil-displacing agent to water and ultrasonically, until the oil-displacing agent is completely dissolved to obtain a clear liquid, which is used as the water phase;

[0104] (2) dissolving the coating material in methylene chloride, and adding Span 80, as oil phase;

[0105](3) place the oil phase in an ice bath and use a high-speed disperser to homogenize it, at the same time, use a dropper to drop the water phase into the oil phase, and the dropwise addition ends in 2min, and after the dropwise addition ends, continue to homogenize 3 times, each homogenization time is 3min, after the homogenization is completed, the colostrum is obtained, and the colostrum obtained after homogenization is transferred to an ultrasonic machine for ultrasonication;

[0106] (4) adding 2wt% PVA aqueous solution dropwise to the sonicated colostrum in step (3) within 3 min under ice bath conditions and performing ultrasonication at the same time; wherein, the sonicated colost...

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Abstract

The invention discloses composite nano-coated oil-displacing agent particles and a preparation method thereof. The preparation method of the composite-type nano-coated oil-displacing agent particles comprises the following steps: (1) mixing an oil phase containing a coating material and a Mix the water phase containing the oil-displacing agent; (2) under ice bath, mix the material obtained in step (1) with the polyvinyl alcohol solution; (3) at 20-30° C., mix the material obtained in step (2) with polyvinyl alcohol The solution is mixed, solidified, and obtained. The composite nano-coated oil-displacing agent particles prepared by the invention are stable, the maximum temperature resistance reaches 80° C., the maximum resistance sodium chloride salt concentration is 70 g / L, and begins to degrade in at least 30 days.

Description

technical field [0001] The invention belongs to the field of composite nano-coated oil displacement agent, and particularly relates to a composite nano-coated oil displacement agent and a preparation method thereof. Background technique [0002] With the continuous development of oilfields, the problem of low residual oil saturation and dispersion of residual oil in the near-wellbore area caused by long-term water injection and scouring has become more and more serious, which will also become an important problem encountered in oilfield development. However, in the chemical flooding method of oil recovery, a large amount of oil displacement agent is consumed in the ineffective zone with low residual oil saturation concentration near the wellbore due to shearing and adsorption at the initial stage of injection. Expected target, less efficient. The polymer commonly used in my country's Daqing Oilfield is ultra-high molecular weight partially hydrolyzed polyacrylamide, which h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/92
CPCC09K8/58C09K8/92C09K2208/10
Inventor 郭凯吴蒙雨邱江凯段秀袁鑫覃龙州张欣鹏刘杰孙蕲陈琳
Owner NANJING TECH UNIV
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