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Acidification plug-removing agent and preparation method thereof

A plugging agent, hydrochloric acid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high corrosion rate of steel, high acid strength, oil-water emulsification, etc., and achieve simple preparation process, low corrosion rate, and solubility The effect of large scaling rate

Active Publication Date: 2022-02-08
胜利油田海发环保化工有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the composite system composed of inorganic acid liquid has high acid strength, is easy to damage the reservoir framework, and has a high corrosion rate of steel, which is mainly aimed at low-permeability reservoirs; emulsified compound acid liquid is easy to cause oil-water emulsification and difficult flowback, and can only target calcium colloidal clogging; the composite oxidized composite plugging remover has a certain safety risk, and it is only for drilling fluid and other clogging

Method used

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  • Acidification plug-removing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The acidifying plug-removing agent described in Example 1 includes a prepositioning liquid, a main body liquid and a postpositioning liquid; wherein, the main body liquid is composed of the following raw materials in parts by weight: 13 parts of hydrochloric acid, 20 parts of fluoboric acid 3.3 parts of acetic acid, 1.4 parts of ammonium fluoride, 0.8 parts of ammonium bifluoride, 1.7 parts of sodium nitrite, 2.0 parts of polyoxyethylene amine, 4 parts of corrosion inhibitor, 1.2 parts of iron ion stabilizer, 3.5 parts of penetrant, 1.5 parts of sodium amine di-o-phenylacetate, 1.5 parts of water.

[0044] in:

[0045] The iron ion stabilizer is hydroxyethylidene diphosphonic acid.

[0046] The corrosion inhibitor is a mixture of oleic acid imidazoline quaternary ammonium salt and sodium gluconate.

[0047] The penetrating agent is a mixture of 2-methyl-2,4-pentanediol, oleic acid diethanolamide and polyoxyethylene polyoxypropylene propylene glycol ether.

[0048] Th...

Embodiment 2

[0071] The acidifying plug-removing agent described in Example 2 includes a prepositioning liquid, a main body liquid and a postpositioning liquid; wherein, the main body liquid consists of the following raw materials in parts by weight: 15 parts of hydrochloric acid, 17 parts of fluoboric acid 2.5 parts of acetic acid, 1.2 parts of ammonium fluoride, 0.9 parts of ammonium bifluoride, 1.5 parts of sodium nitrite, 1.7 parts of polyoxyethylene amine, 3 parts of corrosion inhibitor, 1 part of iron ion stabilizer, 4 parts of penetrant, 1.2 parts of sodium di-o-phenylacetate, 1 part of water.

[0072] in:

[0073] The iron ion stabilizer is hydroxyethylidene diphosphonic acid.

[0074] The corrosion inhibitor is a mixture of oleic acid imidazoline quaternary ammonium salt and sodium gluconate.

[0075] The penetrating agent is a mixture of 2-methyl-2,4-pentanediol, oleic acid diethanolamide and polyoxyethylene polyoxypropylene propylene glycol ether.

[0076] The polyoxyethylene...

Embodiment 3

[0092] The acidifying plug-removing agent described in Example 3 includes a prepositioning liquid, a main body liquid and a postpositioning liquid; wherein, the main body liquid is composed of the following raw materials in parts by weight: 12 parts of hydrochloric acid, 18 parts of fluoboric acid 2.8 parts of acetic acid, 1.5 parts of ammonium fluoride, 1.0 parts of ammonium bifluoride, 1.8 parts of sodium nitrite, 1.5 parts of polyoxyethylene amine, 5 parts of corrosion inhibitor, 1.5 parts of iron ion stabilizer, 5 parts of penetrant, 1.4 parts of sodium di-o-phenylacetate and 2 parts of water.

[0093] in:

[0094] The iron ion stabilizer is hydroxyethylidene diphosphonic acid.

[0095] The corrosion inhibitor is a mixture of oleic acid imidazoline quaternary ammonium salt and sodium gluconate.

[0096] The penetrating agent is a mixture of 2-methyl-2,4-pentanediol, oleic acid diethanolamide and polyoxyethylene polyoxypropylene propylene glycol ether.

[0097] The polyo...

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Abstract

The invention belongs to the technical field of plug-removing agents, and in particular relates to an acidifying plug-removing agent and a preparation method thereof. The acidifying plug-removing agent includes a preposition liquid, a main body liquid and a postposition liquid; wherein, the main body liquid is composed of the following raw materials in parts by weight: hydrochloric acid, fluoroboric acid, acetic acid, ammonium fluoride, hydrogen fluoride Ammonium, sodium nitrite, polyoxyethylene amine, corrosion inhibitor, iron ion stabilizer, penetrant, sodium ethylenediamine di-o-phenylacetate, water. The acidizing plug-removing agent of the present invention, the pre-fluid, the main fluid and the post-fluid act synergistically, which can not only relieve the blockage in the well-entry zone, but also eliminate the pollution in the far-well zone, and realize the deep acidification of the formation , to achieve the purpose of unblocking.

Description

technical field [0001] The invention belongs to the technical field of plug-removing agents, and in particular relates to an acidifying plug-removing agent and a preparation method thereof. Background technique [0002] In the process of oil field development, the oil layer often occurs pollution and blockage, which affects the normal development of the oil field. In order to ensure the normal production of the oil field, restore or increase the permeability of the formation, and realize the increase and stability of the oil well, the pollution blockage of the oil layer must be removed. Relieve the blockage of the oil layer, improve the seepage capacity of the oil layer, so as to further improve the development effect of the oil reservoir. [0003] Through the sampling and analysis of the vomit from the on-site operation of the polymer injection well, it is found that the formation plug of the polymer injection well is a black viscoelastic jelly, which is mainly composed of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524C09K8/528C09K8/74
CPCC09K8/524C09K8/528C09K8/74C09K2208/32C09K2208/12
Inventor 艾明刚刘明哲朱浩王杰龙赵彬
Owner 胜利油田海发环保化工有限责任公司
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