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Nano high-efficiency composite blockage removing liquid

A high-efficiency, plugging-removing technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of short validity period, lower injection rate, low incremental injection volume, etc., to achieve enhanced oil recovery and long unblocked time , significant effect

Active Publication Date: 2012-12-05
大庆百晟石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increase of injection pressure, the injection rate was forced to decrease, which seriously affected the development effect of polymer flooding
In recent years, in order to solve the above problems, ordinary hydraulic fracturing and acidification plugging removal measures have been promoted on the spot. Although the contradiction between the inability to inject polymer and the increase in injection pressure has been alleviated to a certain extent, there are still problems such as low injection volume and limited validity period. short question

Method used

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  • Nano high-efficiency composite blockage removing liquid
  • Nano high-efficiency composite blockage removing liquid
  • Nano high-efficiency composite blockage removing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the formula of the plug-removing liquid adopted is as follows: it is made up of the following components by weight percentage:

[0021] Sodium hypophosphite 8%, organic polyphosphorus carboxylic acid 0.8%, potassium persulfate 1.5%, blue 826 synergist 5%, potassium dichromate 7%, sodium molybdate 9%, iron ion stabilizer 10%, water 58.7%.

[0022] The medicaments of the above-mentioned components are miscible with water at room temperature and then stirred evenly.

[0023] The use effect of the formula in this example in oil and water wells, refer to the following table 2:

[0024] Table 2. The use effect of embodiment 1:

[0025]

[0026]

[0027] It can be seen from Table 2 that the pressure and water volume indicators are very different before and after unblocking, which proves that this formula has a good effect on unblocking.

Embodiment 2

[0028] Embodiment 2: the prescription of the plug-removing liquid that adopts is as follows: be made up of the component of following percentage by weight:

[0029] Sodium hypophosphite 10%, organic polyphosphorus carboxylic acid 1%, potassium persulfate 2%, blue 826 synergist 4%, potassium dichromate 8%, sodium molybdate 10%, iron ion stabilizer 12%, water 53%. The medicaments of the above-mentioned components are miscible with water at room temperature and then stirred evenly.

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Abstract

The invention belongs to fine chemical liquid, and particularly relates to nano high-efficiency composite blockage removing liquid which is a blockage removing polymer used in oil fields for improving crude oil recovery rate. The formula of the nano high-efficiency composite blockage removing liquid comprises the following components in percentage by weight: 8%-10% of sodium hypophosphite, 0.8%-1% of organic phosphorus-aggregating host acid, 1.5%-2% of potassium persulfate, 4%-5% of blue 826 synergist, 7%-8% of potassium bichromate, 9%-10% of sodium molybdate, 10%-12% of iron ion stabilizer, and the balance of water. Compared with traditional common chemical blockage removing technologies, such as acidification technology and the like, the composite blockage removing liquid not only can effectively improve a blockage-removing effect, keep long smooth time and improve crude oil recovery rate, but also is a novel environmentally-friendly product, which has pH value of 7, is free of pungent odor and corrosion and does not damage strata.

Description

technical field [0001] The invention belongs to fine chemical liquid preparation, and in particular relates to a nanometer high-efficiency composite plugging liquid used for plugging polymers in oil fields and improving crude oil recovery. Background technique [0002] During the development and production of oil fields, a large number of chemicals are used in various processes such as drilling and oil and gas extraction, mainly minerals, natural materials, organic substances, inorganic substances, polymer materials, etc. With the injection of chemicals, due to the nature of the reservoir and many factors in the development process, the oil and gas layers near the wellbore will be blocked to varying degrees. There are a large number of bacterial production and high polymer deposition in the oil well formation, which causes formation pore blockage, leading to an increase in the injection pressure of the injection well and a decrease in the injection rate, making it difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
Inventor 孙庆东赵志宽
Owner 大庆百晟石油科技有限公司
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