Acidification blocking remover and preparation method thereof

A plugging agent, hydrochloric acid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of high corrosion rate of steel, high acid strength, oil-water emulsification, etc., and achieves simple preparation process, high scale dissolution rate, The effect of low corrosion rate

Active Publication Date: 2021-11-23
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 blocking remover 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 blocking removers, and particularly relates to an acidification blocking remover and a preparation method thereof. The acidification blocking remover comprises a prepad fluid, a main body fluid and a subsequent fluid, wherein the main body fluid is prepared from the following raw materials in parts by weight: hydrochloric acid, fluoboric acid, acetic acid, ammonium fluoride, ammonium bifluoride, sodium nitrite, polyoxyethylene amine, a corrosion inhibitor, an iron ion stabilizer, a penetrant, sodium ethylenediamine di-o-phenyl acetate and water. According to the acidification blocking remover, the prepad fluid, the main body fluid and the subsequent fluid have a synergistic effect, so the blockage of a well entering zone can be removed, the pollution of a far-away-from-well zone can be eliminated, deep acidification of a stratum is realized, and the aim of removing the blockage is fulfilled.

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 Applications(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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