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Complex acid mixed liquid applicable to acidification of carbonate reservoirs and application thereof

A carbonate rock reservoir, complex acid technology, applied in drilling composition, chemical instrument and method, production fluid and other directions, can solve the problem of reservoir collapse, small treatment radius, residual acid flowback treatment Difficulties and other problems to achieve the effect of low reservoir damage

Inactive Publication Date: 2018-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When reforming the reservoir of this type of reservoir, the reaction speed of the conventional hydrochloric acid system is fast, it is easy to cause the reservoir to collapse, the treatment radius is relatively small, and the follow-up treatment of the residual acid flowback fluid is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 Preparation of Complex Acid Mixture Suitable for Carbonate Reservoir Acidification

[0017] The composition and ratio of components are: 5g EDTA, 40gGLDA, 55g water.

[0018] The preparation method is: at room temperature, add GLDA to water, stir evenly, add EDTA, mix evenly, and obtain.

[0019] After testing, the performance parameters of the complex acid mixed solution prepared above are as follows:

[0020] According to the Q / SH 0352-2010 Sinopec enterprise standard, relevant experiments were carried out on N80 standard steel sheets, and the weight of the steel sheets was reduced from 10.8125g to 10.7552g in 30 days, and the corrosion degree was below 0.53%.

[0021] Weigh 10g of marble No. 1 sample and 10g of No. 2 sample, and add 200ml complex acid system and 200ml 10% hydrochloric acid system respectively at room temperature; when the samples are completely free of bubbles, it takes 3.1 hours for No. 0.6 hours, and weigh the remaining amount of marble...

Embodiment 2

[0022] Example 2 Preparation of Complex Acid Mixture Suitable for Carbonate Reservoir Acidification

[0023] The composition and ratio of components are: 5g EDTA, 50gGLDA, 45g water.

[0024] The preparation method is: at room temperature, add GLDA to water, stir evenly, add EDTA, mix evenly, and obtain.

[0025] After testing, the performance parameters of the complex acid mixed solution prepared above are as follows:

[0026] At normal temperature, the dissolution rate of the system to granular carbonate rock is equivalent to that of 12% hydrochloric acid, and the reaction speed is one-fifth of that of ordinary hydrochloric acid system.

Embodiment 3

[0027] Example 3 Preparation of Complex Acid Mixture Suitable for Carbonate Reservoir Acidification

[0028] The composition and ratio of components are: 3g EDTA, 10gGLDA, 87g water.

[0029] The preparation method is the same as in Example 1.

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PUM

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Abstract

The invention discloses a complex acid mixed liquid applicable to acidification of carbonate reservoirs. The complex acid mixed liquid is composed of 3 to 5% of ethylenediaminetetraacetic acid, 10 to50% of glutamic acid diacetic acid and 45% to 87% of water. The complex acid mixed liquid of the invention can be applied as an acidifying solution for a carbonate reservoir. In operation, the complexacid mixed liquid is uniformly mixed with water according to a volume ratio of 1: (1-3) by volume at first; then the obtained mixture is annularly pumped into a target acidifition horizon along an oil pipe and a casing pipe in virtue of a pump truck; and lifting and dropping of tubular columns are carried out in 1 to 3 hours after stopping of pumping. The complex acid mixed liquid of the invention has the advantages of high corrosion capacity, low corrosion degree to the tubular columns, no generation of secondary precipitates, strong retarding ability, and capacity of directly entering a production pipeline without flowback of residual acid.

Description

technical field [0001] The invention relates to a complex acid mixed solution suitable for acidifying granular carbonate rock or conventional carbonate rock reservoirs and an application thereof, which belongs to the technical field of petroleum development. Background technique [0002] Granular carbonate rock is a special type of reservoir, the main component of this type of reservoir is CaCO 3 , and appear "granular", similar to clastic rock reservoirs such as sandstone in appearance, and conventional carbonate rock reservoirs are relatively tight. When reforming the reservoir of this type of oil reservoir, the reaction speed of the conventional hydrochloric acid system is fast, it is easy to cause the reservoir to collapse, the treatment radius is relatively small, and the follow-up treatment of the residual acid flowback fluid is difficult. Therefore, it is necessary to develop an acidizing reaction system suitable for this type of reservoir to increase the treatment r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/74C09K2208/32E21B43/26
Inventor 李建兵刘希明杨景辉宋志东陈丽霞党娟华张金秋张君李强宋欣成梅华张磊
Owner CHINA PETROLEUM & CHEM CORP
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