Water-soluble polymer solution degrading agent, and preparation method and application thereof

A technology of water-soluble polymer and degrading agent, which is applied in the directions of drilling composition, water treatment parameter control, chemical instruments and methods, etc., can solve the problem of increased water treatment cost, increased treatment difficulty of polymers, and difficulty of produced water treatment. and other problems, to achieve good stability, improve the effect of recycling and efficiency

Inactive Publication Date: 2016-09-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] With the progress of secondary oil recovery, it is more and more difficult to treat the produced water after demulsification and separation of many production fluids containing polymers. The most critical thing is that the existence of polymers increases the difficulty of treatment. Processing costs are greatly increased

Method used

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  • Water-soluble polymer solution degrading agent, and preparation method and application thereof
  • Water-soluble polymer solution degrading agent, and preparation method and application thereof
  • Water-soluble polymer solution degrading agent, and preparation method and application thereof

Examples

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Embodiment 1

[0019] This embodiment provides a water-soluble polymer solution degradation agent, which is composed of the following substances in mass percentage: 1-5% of ferrous compound, 1-10% of ascorbic acid, and the rest is water.

[0020] Principle of the present invention:

[0021] The molecular structure of ascorbic acid is as follows:

[0022]

[0023] During the coordination process between ascorbic acid molecules and metal ions, the 2nd and 3rd atoms in the molecular structure contribute the most to the paramagnetism of metal ions (0.52, 1.6, 1.6, 0.42, 0.21, 0.09 in sequence), so the ascorbic acid solution and sub After the iron ion solution is mixed, the following reactions occur:

[0024]

[0025] The mechanism of degradation agent is:

[0026]

[0027] Ascorbic acid itself is a green, low-cost, environment-friendly antioxidant, and ascorbic acid can interact with Fe 3+ Carry out a coordination reaction to generate soluble ferric iron, which is beneficial to the r...

Embodiment 2

[0029] On the basis of Example 1, this example provides a method for preparing a water-soluble polymer solution degradation agent, the steps are as follows:

[0030] (1) 5%wt ferrous compound aqueous solution and the 12%wt ascorbic acid solution of 1000g of preparing 1000g respectively;

[0031] (2) Add the ascorbic acid solution into the aqueous ferrous compound solution, and stir evenly to obtain the degradation agent.

Embodiment 3

[0033] This embodiment provides a kind of preparation method of water-soluble polymer solution degradation agent, and the steps are as follows:

[0034] (1) 10%wt ferrous compound aqueous solution and the 20%wt ascorbic acid solution of 1000g of preparing 1000g respectively;

[0035] (2) Add the ascorbic acid solution into the aqueous ferrous compound solution, and stir evenly to obtain the degradation agent.

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Abstract

The invention provides a water-soluble polymer solution degradation agent, which is composed of the following substances in mass percentage: 1-5% of ferrous compound, 1-10% of ascorbic acid, and the rest is water. The water-soluble polymer solution degradation agent provided by the present invention uses ascorbic acid to coordinate with ferrous ions to prepare a long-term stable ferrous solution, so it has good stability, and can activate molecular oxygen when added to a water-soluble polymer solution. Free radicals are formed to degrade polymers, which can be used as oilfield fracturing fluid gel breakers and polymer-containing oilfield production fluid water treatment agents. The apparent viscosity of the degraded solution is less than or equal to 5.0mPa.s, which improves the recycling effect and efficiency of the produced sewage.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a water-soluble polymer solution degradation agent and its preparation method and application. Background technique [0002] Hydraulic fracturing has become more and more important as a technical measure for oil and gas stimulation. With the development of tight reservoirs such as shale gas and tight gas, the large-scale volumetric fracturing mode has been paid more and more attention. [0003] The incomplete gel breaking of fracturing fluid will increase the viscosity of the gel breaking fluid, resulting in a sharp drop in the flowback rate. The gel breaking fluid remaining in the formation will block the rock pores and sand filling fractures, causing formation damage. Therefore, it is necessary to improve the gel-breaking ability of the fracturing fluid as much as possible, increase the flowback rate and increase the oil and gas flow conductivity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C09K8/68C02F103/10
CPCC02F1/72C02F2103/10C02F2209/09C02F2305/023C09K8/685C09K8/905C09K2208/26
Inventor 吴江慕立俊赵振峰李宪文张矿生薛小佳唐梅荣陈宝春王文雄李楷刘锦范华波郭钢周小群刘怡安杰
Owner PETROCHINA CO LTD
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