Self-emulsifying blockage removing liquid and preparation method thereof

A non-ionic emulsifier and mixed liquid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of entanglement between polymers and heavy oil, difficulty in unblocking, high cost of use, etc., and reduce the oil-water interface High tension, high safety, corrosion-reducing effect

Inactive Publication Date: 2020-04-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the blockage, a large amount of polymer and heavy oil are entangled, and it is difficult to remove the blockage
[0003] Commonly used plugging removers in oilfields often contain a large amount of organically extracted oil deterg

Method used

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  • Self-emulsifying blockage removing liquid and preparation method thereof
  • Self-emulsifying blockage removing liquid and preparation method thereof
  • Self-emulsifying blockage removing liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0057] Example 1

[0058] This example 1 provides a self-emulsifying plug-removing liquid, and the raw material components of the self-emulsifying plugging-removing liquid include:

[0059]

[0060]

[0061] The preparation method of the self-emulsifying plug-removing liquid provided in Example 1 includes the following steps:

[0062] Add 1g of polyvinyl alcohol to the container, add 10g of distilled water, set the stirring speed to 300r / min, and stir evenly at 45°C to obtain mixed solution A, which is put into a sealed container for later use; then, 62g of distilled water and 5g of hexadecyl Trimethylammonium bromide, 5g ammonium persulfate, 15g citric acid, 2g imidazoline quaternary ammonium salt were mixed uniformly under stirring at 300r / min to obtain mixed solution B; finally, mixed solution A and mixed solution B were mixed at 1000r / min After stirring evenly at min, a self-emulsifying plugging solution is obtained, which is sealed for later use.

[0063] The self-emulsifying pl...

Example Embodiment

[0068] Example 2

[0069] This Example 2 provides a self-emulsifying plug-removing liquid, and the raw material components of the self-emulsifying plugging-removing liquid include:

[0070]

[0071] The preparation method of the self-emulsifying plug-removing liquid provided in Example 2 includes the following steps:

[0072] Add 0.5g of polyoxyethylene octylphenol ether-10 to the container, add 5g of distilled water, set the stirring speed to 300r / min, and stir evenly at 45°C to obtain mixed solution A, which is put into a sealed container for later use; then, 76g of distilled water , 3g cetyltrimethylammonium bromide, 4g urea peroxide, 10g citric acid, 1.5g Mannich base are mixed uniformly under stirring at 300r / min to obtain mixed solution B; finally, the mixed solution A and The mixed solution B is mixed and stirred evenly at 500r / min to obtain a self-emulsifying and blocking solution, which is sealed for later use.

[0073] The self-emulsifying plug-removing liquid prepared in E...

Example Embodiment

[0074] Example 3

[0075] This example 3 provides a self-emulsifying plug-removing liquid, and the raw material components of the self-emulsifying plugging-removing liquid include:

[0076]

[0077] The preparation method of the self-emulsifying plug-removing liquid provided in Example 3 includes the following steps:

[0078] Add 2g of polyoxyethylene octylphenol ether-10 into the container, add 10g of distilled water, set the stirring speed to 300r / min, and stir evenly at 45°C to obtain mixed solution A, which is put into a sealed container for later use; then, 62.5g of distilled water , 5g dodecyltrimethylammonium chloride, 4g ammonium persulfate, 15g citric acid, 1.5g polyoxyethylene alkylphenol ether are mixed uniformly under 300r / min stirring to obtain mixed liquid B; finally, mixed liquid A Mix with mixed liquid B, stir evenly at 1000r / min to obtain a self-emulsifying plugging solution, and seal it for later use.

[0079] The self-emulsifying plug-removing liquid prepared in Ex...

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Abstract

The invention discloses a self-emulsifying blockage removing liquid and a preparation method thereof. The invention provides the self-emulsifying blockage removing liquid. The self-emulsifying blockage removing liquid comprises the following components in percentage by weight: 0.2-3wt% of a nonionic emulsifier, 0.5-5wt% of a cationic surfactant, 1-5wt% of a water-soluble oxidant, 1-15wt% of an organic acid corrosion inhibitor, 0.5-2wt% of a corrosion inhibitor and the balance of water. The invention also provides the preparation method of the self-emulsifying blockage removing liquid. The method comprises the following steps: mixing and stirring the nonionic emulsifier and part of the water to obtain a mixed solution A; mixing and stirring the cationic surfactant, the water-soluble oxidant, the organic acid corrosion inhibitor, the corrosion inhibitor and the residual water to obtain a mixed solution B; and mixing and stirring the mixed solution A and the mixed solution B to obtain theself-emulsifying blockage removing liquid. The self-emulsifying blockage removal liquid provided by the invention has excellent oil washing capability and blockage removal performance, and is remarkable in blockage removal effect, relatively low in corrosion to a pipeline and relatively high in safety.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry. More specifically, it relates to a self-emulsifying plug-removing liquid and a preparation method thereof. Background technique [0002] Many oilfields in my country have successively carried out tests and applications of polymer flooding technology. With the continuous injection of polymers, although the production of oil wells can be increased, due to the cross-linking of polymers and crude oil and their adsorption in the formation, there have been Severe blockage will lead to an increase in injection pressure and a decrease in the liquid absorption index of the formation, which will affect the effect of polymer flooding. Therefore, the problem of polymer injection well blockage needs to be solved urgently. In the blockage, the polymer and heavy oil are entangled in a large amount, and it is difficult to remove the blockage. [0003] Commonly used plugging removers in oilfields of...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528C09K2208/32
Inventor 刘义刚邹剑刘长龙高尚张丽平兰夕堂符扬洋张璐郭布民
Owner CHINA NAT OFFSHORE OIL CORP
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