An acid liquid system for acidifying carbonate rock reservoirs

A carbonate rock reservoir and acid solution technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of difficult to achieve deep acidification of carbonate rock reservoirs and shorten the service life of downhole pipe strings and equipment. Shortage, increased corrosion of downhole pipe strings and equipment, etc., to achieve the effect of being conducive to large-scale on-site construction application, convenient transportation, and low cost

Active Publication Date: 2019-09-06
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, under high temperature conditions, hydrochloric acid acidification is difficult to achieve deep acidification of carbonate reservoirs
(2) The temperature at the bottom of the well is high, which causes the corrosion of the downhole pipe string and equipment to be aggravated by the acid liquid, shortens the service life of the downhole pipe string and equipment, and greatly increases the cost of maintenance and replacement
[0005] The cost of the acidification system provided by the existing technology is relatively high, and it is difficult to apply on-site construction on a large scale

Method used

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  • An acid liquid system for acidifying carbonate rock reservoirs
  • An acid liquid system for acidifying carbonate rock reservoirs

Examples

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Effect test

Embodiment 1

[0028] This embodiment provides an acid liquid system for acidifying carbonate rock reservoirs, which includes the following components in mass percentage: 19.8% sulfamic acid, 15.0% urea nitrate, 7.0% formic acid, 0.5% potassium chloride, 2.0% ethanol, 0.5% imidazoline corrosion inhibitor and the balance of water.

[0029] The preparation method of this acid liquid system is as follows:

[0030] According to the mass percentage content of each component in the acid liquid system, first put sulfamic acid, urea nitrate, potassium chloride, and ethanol in the reactor at room temperature and stir for 10 minutes, and then add formic acid, imidazoline The corrosion inhibitor and water are stirred evenly to obtain the acid solution system of this embodiment.

Embodiment 2

[0032] This embodiment provides an acid liquid system for acidifying carbonate rock reservoirs, which includes the following components in mass percentage: 21.0% sulfamic acid, 20.0% urea nitrate, 8.0% acetic acid, 1.5% sodium chloride, 2.0% crude oil, 0.6% thiourea corrosion inhibitor and the rest water.

[0033] The preparation method of this acid liquid system is as follows:

[0034] According to the mass percentage content of each component in the acid liquid system, first put sulfamic acid, urea nitrate, sodium chloride, and crude oil in the reaction kettle and stir for 10 minutes at room temperature, and then add acetic acid and thiourea to the reaction kettle The corrosion inhibitor and water are stirred evenly to obtain the acid solution system of this embodiment.

Embodiment 3

[0036] This embodiment provides an acid liquid system for acidifying carbonate rock reservoirs, which includes the following components in mass percentage: 22.5% sulfamic acid, 16.0% urea nitrate, 5.5% acetic acid, 1.0% sodium chloride, 3.0% diesel oil, 0.8% imidazoline corrosion inhibitor and the rest water.

[0037] The preparation method of this acid liquid system is as follows:

[0038] According to the mass percentage content of each component in the acid liquid system, first put sulfamic acid, urea nitrate, sodium chloride, and diesel oil in the reactor at room temperature and stir for 10 minutes, and then add acetic acid, imidazoline The corrosion inhibitor and water are stirred evenly to obtain the acid solution system of this embodiment.

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Abstract

The invention discloses an acid solution system for acidifying carbonate reservoir rocks, and belongs to the field of petrochemical industry. The acid solution system comprises the following components in percentages by mass: 10-50% of sulfamic acid, 10-50% of urea nitrate, 3-15% of organic weak acid, 0.1-5% of a cosolvent, 0.1-2% of a corrosion inhibitor, and the balance being water. The acid solution system has the advantages of high corrosion rate, large increasing range of the corrosion rate, low corrosion rate, and the like. The acid solution system provided by an embodiment has the advantages of simple formula, wide freight source of each component, transport convenience, and low cost; and the system is good for large scale on-site construction application.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to an acid liquid system for acidifying carbonate rock reservoirs. Background technique [0002] Acidizing is the main measure to increase production of carbonate rock reservoirs. The method is to inject acid liquid into the formation to dissolve the mineral components of the reservoir rock and the substances that block the reservoir during drilling, completion, workover, and oil production operations, improving and Improve the permeability of the reservoir, thereby increasing the productivity of oil and gas wells. Hydrochloric acid is usually used to acidify carbonate rock reservoirs (Wang Desheng, Practical Handbook of Modern Reservoir Fracturing and Acidizing New Technologies, Beijing Petroleum Industry Press, 2006). In the acidizing process, hydrochloric acid reacts rapidly with carbonate rocks, In a short period of time, it can effectively dissolve carbonate rock minerals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/74
Inventor 佘朝毅桑宇杨建曾然苏军付艳
Owner PETROCHINA CO LTD
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