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Acid liquor system for online acidification of water injection well for oil exploitation and preparation process thereof

A preparation process and technology for water injection wells, which are applied to drilling compositions, chemical instruments and methods, etc., can solve problems such as equipment corrosion, and achieve the effects of reducing damage, improving acidification effect, and expanding acidification range.

Inactive Publication Date: 2021-07-16
西安石油大油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if the acid liquid injected into the water injection well is not flowed back in time, it will cause corrosion to equipment such as oil pipes and casings. Therefore, it is necessary to improve the existing acid liquid system and processing technology

Method used

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  • Acid liquor system for online acidification of water injection well for oil exploitation and preparation process thereof
  • Acid liquor system for online acidification of water injection well for oil exploitation and preparation process thereof
  • Acid liquor system for online acidification of water injection well for oil exploitation and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An acid solution system for on-line acidification of water injection wells for petroleum development, comprising 30% by mass of compound acid solution, 10% by mass of retarder, 5% by mass of chelating agent, and 10% by mass of Composite additives, the remaining components are water;

[0037] The compound acid liquid is hydrochloric acid, naphthenic acid, oxalic acid, and organic phosphonic acid prepared according to the mass ratio of 26:2.5:7.5:1 to form an aqueous solution with a concentration of 30% by mass.

[0038] The retarder is prepared from benzaldehyde, pyridinium salt corrosion inhibitor synergist, hydrazine hydrate, absolute ethanol, and bacterial cellulose in a mass ratio of 3:1:2:1:2 to prepare an aqueous solution with a mass percent concentration of 50%.

[0039]The chelating agent is prepared from an aminophosphonic acid ion exchanger, a complex polyhydroxy chelating agent, and a fluorine-containing complex in a mass ratio of 3:2:1 to prepare an aqueous s...

Embodiment 2

[0052] This embodiment is basically the same as Embodiment 1, the difference is that:

[0053] The compound acid solution is compound fluoroboric acid, naphthenic acid, oxalic acid, and organic phosphonic acid according to the mass ratio of 26:2.5:7.5:1 to prepare an aqueous solution with a mass percent concentration of 20%, wherein the compound fluoroboric acid has a mass concentration of 30 % hydrochloric acid and fluoroboric acid with a mass concentration of 23% are composed according to a mass ratio of 1:2.

[0054] S1, preparation of compound acid solution:

[0055] S11. Primary reaction: put 40% of the total amount of the composite fluoroboric acid into the first reaction kettle, adjust the temperature to 40°C, add naphthenic acid dropwise into the first reaction kettle, and continue stirring at a stirring speed of 150r / min , continue to stir and react for 30 minutes after the dropwise addition, to obtain a mixed acid solution;

[0056] S12. Secondary reaction: put 60%...

Embodiment 3

[0062] This embodiment is basically the same as Embodiment 2, the difference is:

[0063] The compound acid solution is compound fluoroboric acid, naphthenic acid, oxalic acid, and organic phosphonic acid according to the mass ratio of 26:2.5:7.5:1 to prepare an aqueous solution with a mass percent concentration of 20%, wherein the compound fluoroboric acid has a mass concentration of 40 % hydrochloric acid and fluoroboric acid with a mass concentration of 30% are composed according to a mass ratio of 1:2.

[0064] S1, preparation of compound acid solution:

[0065] S11. Primary reaction: put 40% of the total amount of the composite fluoroboric acid into the first reaction kettle, adjust the temperature to 32°C, add naphthenic acid dropwise into the first reaction kettle, and continue stirring at a stirring speed of 67r / min , continue to stir and react for 30 minutes after the dropwise addition, to obtain a mixed acid solution;

[0066] S12. Secondary reaction: put 60% of th...

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Abstract

The invention discloses an acid liquor system for online acidification of a water injection well for oil exploitation and a preparation process thereof. The acid liquor system comprises the following components in percentage by mass: 30-40% of composite acid liquor, 5-15% of retarding liquid, 5-10% of a chelating agent, 5-10% of a composite additive and the balance of water, the preparation process comprises the following specific steps: S1, preparation of a composite acid solution: S11, primary reaction; S12, secondary reaction; s2, preparing a retarding solution; s3, preparing a chelating agent; s4, preparing a composite additive; and S5, mixing to obtain the acid liquor system. The acid liquor system for oil exploitation is a multi-component acid which is mainly composed of hydrochloric acid and is formed by mixing multiple organic acids, the two different acids can play an acidizing role in different time ranges, the acidizing range in oil exploitation can be effectively expanded, meanwhile, the preparation process is optimized so that the acid liquor system can meet the requirement for online acidizing of the water injection well, operation is fine, risks existing in the preparation process are reduced, the acid liquor performance is high, and operation is convenient.

Description

technical field [0001] The invention relates to the technical field of acidification of water injection wells for oil exploitation, in particular to an acid liquid system for on-line acidification of water injection wells for oil exploitation and a preparation process thereof. Background technique [0002] Water injection is one of the effective measures to increase production in the middle and late stages of oilfield development. Most of my country's crude oil production comes from water injection development. Phenomena such as under-injection under high pressure lead to poor water injection effect. [0003] Acidizing is a measure to increase the recovery of oil wells and an effective technical measure to increase the injection of injection wells. Its principle is to recover or improve the permeability of formation pores and fractures through the dissolution and dissolution of acid liquid on rock cement or formation pores and blockages in fractures. Pickling is to inject a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 邢艳斌张相春张国华赵晨李昂张鑫邢志辉孟高
Owner 西安石油大油气科技有限公司
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