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Deep-penetration chelated environmentally-friendly online plug removal system and preparation method thereof

A deep-penetrating chelating and environment-friendly technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easily injuring its skeleton, fast reaction speed, reconstruction in far-well areas, etc., to avoid secondary damage, The effect of preventing secondary precipitation and expanding the radius of blockage removal

Inactive Publication Date: 2019-12-13
新疆肯迪能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, acid solutions commonly used in various oil and gas fields include hydrochloric acid, soil acid and other systems, but such acid systems react quickly with the rock wall, and the effective distance of plugging removal is short, which cannot effectively stimulate the far well zone; in addition, matrix acidification, especially sandstone During acidizing, conventional inorganic acids are likely to damage its skeleton, causing sand out near the wellbore and causing wellbore instability. At the same time, the by-products of the chemical reaction between hydrofluoric acid and aluminosilicates, such as fluorosilicate, will undergo secondary or tertiary reactions. A series of insoluble colloidal precipitates are formed, and metal ions generated after acid solution dissolution are easy to form metal precipitates, causing secondary damage to the reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Under the condition of stirring at room temperature, add 35 parts of clear water, 5 parts of ethylenediaminetetraacetic acid, 15 parts of citric acid and 3 parts of ethylenediaminetetramethylenephosphonic acid to the reaction kettle in sequence, stir for 20min, and then add 15 parts of sodium tartrate and 18 parts of polydimethyldiallyl ammonium chloride, continue to stir for 30min, finally add the mixture of 9 parts of cinnamaldehyde and hexamethylenetetramine (cinnamaldehyde and hexamethylenetetramine The ratio of tetramine is 1:2) and 2 parts of sodium persulfate, and the stirring is continued for 15 minutes to obtain the finished product of the deep penetrating chelation environmental protection online plugging removal system.

[0029] The deep penetration chelation environmental protection online plugging removal system was prepared into a 20% solution to test its corrosion performance. It was found that the dissolution rate of the system was equivalent to that of t...

Embodiment 2

[0031] Under the condition of stirring at room temperature, add 40 parts of clear water, 6 parts of glycolic acid, 15 parts of citric acid and 3 parts of aminotrimethylene phosphonic acid to the reaction kettle successively, stir for 20 minutes, then add 12 parts of sodium gluconate and 20 parts of KCl, continue to stir for 30 minutes, and finally add 5 parts of a mixture of cinnamaldehyde and hexamethylenetetramine (the ratio of cinnamaldehyde and hexamethylenetetramine is 1:3), and 2 parts of persulfuric acid Ammonium continued to stir for 15 minutes to obtain the finished product of the deep penetration chelation environmental protection online plugging removal system.

[0032] The deep penetration chelation environmental protection online plugging removal system was prepared into a 20% solution to test its corrosion performance. It was found that the corrosion rate of the system was equivalent to that of the conventional hydrochloric acid system. The average reaction rate ...

Embodiment 3

[0034] Under the condition of stirring at room temperature, add 35 parts of clear water, 5 parts of hydroxyethylethylenediamine triacetic acid, 10 parts of glycolic acid and 8 parts of aminoacetic acid to the reaction kettle in turn, stir for 20 minutes, and then add 18 parts of lemon to the reaction kettle Acetyl ammonium chloride and 15 parts of polyallyltrimethylammonium chloride, continue to stir for 30min, finally add the mixture of 9 parts of cinnamaldehyde and hexamethylenetetramine (the mixture of cinnamaldehyde and hexamethylenetetramine) The ratio is 1:2) and 3 parts of potassium persulfate, and continue to stir for 15 minutes to obtain the finished product of the deep penetrating chelation environmental protection online plugging removal system.

[0035] The deep penetration chelation environmental protection online plugging removal system was prepared into a 20% solution to test its corrosion performance. It was found that the dissolution rate of the system was equi...

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PUM

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Abstract

The invention discloses a deep-penetration chelated environmentally-friendly online plug removal system, which comprises the following raw materials by weight: 2-5% of a matrix chain breaking agent, 10-30% of a solid chelating acid, 5-20% of a clay stabilizer, 10-20% of a synergist, 3-10% of a corrosion inhibitor, and the balance of water. Compared with the conventional acid liquor, the system ofthe present invention slowly reacts with acid rock, wherein the acid rock reaction rate is only about one tenth of the acid rock reaction rate of hydrochloric acid. According to the present invention,the system has strong chelating ability to metal ions such as iron ions, calcium ions and the like, such that the metal ions can be prevented from being precipitated in residual acid so as to avoid secondary damage to reservoir.

Description

technical field [0001] The invention is an environmentally friendly plugging removal system for increasing production and injection in oil fields. The product does not contain H+, and no flowback is required after the construction is completed, especially a deep penetration chelation environmental protection online plugging removal system. This system is suitable for low-permeability acid rock reservoirs. For long-term under-injection water injection wells, it can realize online small-displacement injection without stopping the well. It can efficiently chelate the composite scale in the wellbore and formation, relieve deep blockage, and restore the reservoir. Permeability, increase water injection and improve oil and gas well production. Background technique [0002] Conventional acidizing is an effective technical measure to increase production of oil and gas wells and increase injection of water wells. Mainly through the dissolution and dissolution of matrix acid on rock ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 危建新金建国杨文博尉瑞龙龚知远杨震王翠明高连涛
Owner 新疆肯迪能源科技有限公司
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