Evaluation method of scale inhibition rate of scale inhibitor with high barium sulfate scale content for oil field

An evaluation method and technology of antiscalants, which are applied in the direction of chemical analysis by titration method, can solve the problems of reducing detection cost and large actual differences, and achieve the effects of low detection cost, simple operation and strong operability.

Inactive Publication Date: 2018-12-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to overcome the problem that the scale inhibition rate of the existing barium sulfate scale inhibitor is greatly different from the actual one; the second object is to reduce the detection cost; the third object is to simplify the evaluation process and reduce the consumption of material, manpower and financial resources

Method used

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  • Evaluation method of scale inhibition rate of scale inhibitor with high barium sulfate scale content for oil field
  • Evaluation method of scale inhibition rate of scale inhibitor with high barium sulfate scale content for oil field
  • Evaluation method of scale inhibition rate of scale inhibitor with high barium sulfate scale content for oil field

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Experimental program
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Effect test

Embodiment 1

[0068] The following reagents are of analytical grade:

[0069] Oilfield formation water A solution: prepare 1 liter of solution, including 2035mg barium chloride and 30.0g sodium chloride.

[0070] Oilfield injection water B solution; prepare 1 liter of solution, of which sodium sulfate 2250mg, sodium chloride 2000mg.

[0071] Scale inhibitor C solution: Weigh 1.00g of scale inhibitor (weigh to 0.01g), dissolve it with a small amount of distilled water and transfer to a 1000mL volumetric flask to dilute to the mark. The solution contains 1.0mg / mL of scale inhibitor.

[0072] 0.01mol / l EDTA disodium magnesium solution (4.30g EDTA disodium magnesium, dissolved in distilled water and diluted to 1000mL); 0.0124mol / l EDTA standard solution; chrome black T indicator; PH=10 ammonia-ammonium chloride buffer Solution; calcium reagent indicator; 50% hydrochloric acid solution (buffer solution); constant temperature water bath or constant temperature oven; analytical balance; sterile, clean, co...

Embodiment 2

[0093] The following reagents are of analytical grade:

[0094] Oilfield formation water A solution: prepare 1 liter of solution, including 2035mg barium chloride and 30.0g sodium chloride.

[0095] Oilfield injection water B solution; prepare 1 liter of solution, of which sodium sulfate 2250mg, sodium chloride 2000mg.

[0096] Scale inhibitor C solution: Weigh 1.00g of scale inhibitor (weigh to 0.01g), dissolve it with a small amount of distilled water and transfer to a 1000mL volumetric flask to dilute to the mark. The solution contains 1.0mg / mL of scale inhibitor.

[0097] 0.01mol / l EDTA disodium magnesium solution (4.30g EDTA disodium magnesium, dissolved in distilled water and diluted to 1000mL); 0.0124mol / l EDTA standard solution; chrome black T indicator; PH=10 ammonia-ammonium chloride buffer Solution; calcium reagent indicator; 50% hydrochloric acid solution (buffer solution); constant temperature water bath or constant temperature oven; analytical balance; sterile, clean, co...

Embodiment 3

[0118] The following reagents are of analytical grade:

[0119] Oilfield formation water A solution: prepare 1 liter of solution, including 2035mg barium chloride and 30.0g sodium chloride.

[0120] Oilfield injection water B solution; prepare 1 liter of solution, of which sodium sulfate 2250mg, sodium chloride 2000mg.

[0121] Scale inhibitor C solution: Weigh 1.00g of scale inhibitor (weigh to 0.01g), dissolve it with a small amount of distilled water and transfer to a 1000mL volumetric flask to dilute to the mark. The solution contains 1.0mg / mL of scale inhibitor.

[0122] 0.01mol / l EDTA disodium magnesium solution (4.30g EDTA disodium magnesium, dissolved in distilled water and diluted to 1000mL); 0.0124mol / l EDTA standard solution; chrome black T indicator; PH=10 ammonia-ammonium chloride buffer Solution; calcium reagent indicator; 50% hydrochloric acid solution (buffer solution); constant temperature water bath or constant temperature oven; analytical balance; sterile, clean, co...

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Abstract

The invention provides an evaluation method of a scale inhibition rate of a scale inhibitor with a high barium sulfate scale content for an oil field. A barium chloride A solution with a certain concentration and a sodium sulfate B solution with a certain concentration are prepared according to an actual ion content of produced water, wherein other ions in the two solutions are replaced by sodiumchloride, a scale inhibitor C solution is prepared, a to-be-tested sample with the scale inhibitor, a to-be-tested sample without the scale inhibitor and a blank sample are prepared, the content of bari um ions in the to-be-tested solutions are tested by EDTA chemical titration, the EDTA consumption of the to-be-tested sample with the scale inhibitor, the to-be-tested sample without the scale inhibitor and the blank sample are calculated to obtain the scale inhibition rate of barium sulfate scale so as to realize the evaluation of the scale inhibition rate of the barium sulfate scale inhibitorfor oilfield water, especially the evaluation of oilfield water with high salinity. The evaluation method is more in line with actual production and can correctly guide a scale inhibitor filling process. The method is simple in operation, low in requirement for testing personnel, low in detection cost and strong in operability of oil production units, and benefits for popularization.

Description

Technical field [0001] The invention belongs to the technical field of oilfield scale inhibition, and specifically relates to a method for evaluating the scale inhibition rate of an oilfield high-content barium sulfate scale inhibitor. Background technique [0002] When the oil field injected water is rich in SO 4 2- , The formation water is rich in Ba 2+ / Sr 2+ , The incompatibility of the two causes the ground pipe network, gathering and transportation station to use Ba(Sr)SO 4 Severe fouling problems dominated by fouling cause a series of problems such as pipeline blockage and frequent operation, which affect crude oil production. The main method of oil field anti-scaling is to add barium sulfate scale chemical anti-scaling agent. The chemical anti-scaling method mainly refers to adding an anti-scaling agent in the water, which is prevented by the combination of anti-scaling agent and scaling ions (generally referred to as scaling cations). The method of scale generation. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 刘爱华李琼玮何淼刘宁王小勇苑慧莹唐泽玮姜毅董俊
Owner PETROCHINA CO LTD
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