Barium and strontium scale removing agent and preparation method thereof

A descaling agent, strontium scale technology, applied in descaling and water softening, chemical instruments and methods, special treatment targets, etc. Strong ability and good compatibility effect

Active Publication Date: 2019-01-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aminocarboxyl complexing agents can form stable, water-soluble complexes with various metal ions, and are widely used in the treatment of Ca 2+ , Mg 2+ 、Ba 2+ 、Sr 2+ Salt is the main insoluble scale. Among these complexing agents, EDTA has the simplest molecular structure, but the descaling ability of EDTA is low.
Although more and more people have done related research on barium and strontium scale unblocking agents, the unblocking effect is generally poor

Method used

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  • Barium and strontium scale removing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A barium strontium scale remover is made up of the following raw materials in weight percentage:

[0044] Hydrochloric acid 10-15%;

[0045] Hydrofluoric acid 2-5%;

[0046] Chelating agent 2-5%;

[0047] Anti-scaling agent 2-5%;

[0048] Corrosion inhibitor 0.5% ~ 1%;

[0049] Surfactant 0.5% ~ 1%;

[0050] Synergist 0.1-0.3%;

[0051] Regulator 0.2% ~ 0.4%;

[0052] The remainder is water.

[0053] The preparation method of the barium strontium scale remover comprises the following steps: successively take hydrochloric acid, hydrofluoric acid, chelating agent, antiscalant, corrosion inhibitor, surfactant, synergist and water of formula quantity, place in In a beaker, stir and raise the temperature to 60-70°C, add the prescribed amount of solid sodium hydroxide, adjust the pH of the solution to 7-8, and obtain the descaling agent.

[0054] The descaling agent of the present invention can effectively remove barium and strontium scales that are insoluble in acid ...

Embodiment 2

[0056] On the basis of Example 1, the hydrochloric acid and hydrofluoric acid are commercially available chemically pure or industrially pure.

[0057] The chelating agent is one of diethylenetriaminepentapentaacetic acid and methacryloyl ethyl betaine; preferably diethylenetriaminepentapentaacetic acid, and the scale dissolving ability of said diethylenetriaminepentapentaacetic acid can reach 10.2g / L or so; the antiscalant is an organic phosphoric acid type antiscalant, preferably polyamino polyether methylene phosphoric acid with better calcium tolerance and dispersibility. The chelating agent and the anti-scaling agent have obvious solubility-limiting effects, and improve the tolerance of calcium, barium, strontium and other ions.

[0058] The corrosion inhibitor is composed of ethanol, polyepoxysuccinic acid, triethylenetriamine, cyclohexanone, and octynyl alcohol in a mass ratio of 6:2:2:4:1, at 90°C to 100°C Stir at the reaction temperature for 1 hour to prepare a solut...

Embodiment 3

[0062] A barium strontium scale remover, which is composed of the following raw materials in weight percentage: 12% hydrochloric acid; 3% hydrofluoric acid; 3% chelating agent; 3% scale inhibitor; 0.5% corrosion inhibitor; 0.5% surfactant; 0.1% synergist; 0.2% regulator; the rest is water.

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Abstract

The invention provides a barium and strontium scale removing agent and a preparation method thereof. The scale removing agent is prepared from the following raw materials in percentage by weight: 10-15% of hydrochloric acid, 2-5% of hydrofluoric acid, 2-5% of chelating agent, 2-5% of scale inhibitor, 0.5%-1% of corrosion inhibitor, 0.5%-1% of surfactant, 0.1-0.3% of synergist, 0.2%-0.4% of modifier and the balance water. The scale removing agent raw materials are wide in resource and low in price, the prepared scale removing agent is stable in scale removing performance, good in temperature resistance, long in service life, capable of being stored and used for a long term, and high in scale dissolution capability, a novel method is provided for the aspect of oil field acid liquor insolublescale treatment, and the barium and strontium scale removing agent has good application prospects in the aspect of water well decompression and augmented injection.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a barium strontium scale remover and a preparation method thereof. Background technique [0002] For oilfields developed by water flooding, after the oilfield enters the water-cut period, scales will often appear in the formations, downhole strings, and surface pipelines, which will bring great harm to the production and stable production of the oilfield. The wall is very firm, and it is difficult to remove it with general acid and alkali solutions. It is the most difficult type of scale in oilfield water. In recent years, the focus of research on chemical descaling methods for this type of scale has shifted from the initial alkaline cooking method to the formula of descaling agents based on organic complexing agents. Aminocarboxyl complexing agents can form stable, water-soluble complexes with various metal ions, and are widely used in the treatment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14C02F103/10
CPCC02F1/62C02F5/145C02F2103/10C02F2303/08C02F2305/04
Inventor 邓志颖张随望陆小兵王勇王尔珍宋昭杰隋蕾胡改星
Owner PETROCHINA CO LTD
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