Antiscalant and fungicide for oilfield produced water

A technology of produced water and bactericide, which is used in mining wastewater treatment, descaling and water softening, water/sludge/sewage treatment, etc. , The effect of lattice distortion is good, and the development cost is saved

Active Publication Date: 2022-03-25
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of antiscalant and bactericide for oilfield produced water, which has dual effects of scale inhibition and bactericidal, aiming at the technical insufficiency of existing scale inhibitors with poor scale inhibition effect and the need to add fungicides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of isoacrylic phosphoric acid and p-styrene sulfonic acid copolymer is as follows:

[0017] (1) Weigh 1 mole of p-styrenesulfonic acid, add 2 moles of deionized water, and stir in a water bath at 40-50°C until completely dissolved; (2) After the solution is cooled, pour it into Then add 0.4 mole of isopropenyl phosphoric acid to the three-port reactor with reflux device, dropping funnel and thermometer, and turn on the electric stirring to make it dissolve evenly; heat slowly, and pass nitrogen gas for 15 minutes, and the temperature rises to 75°C and remains stable , add potassium persulfate dropwise, the amount of addition is about 10% of the total mass of p-styrenesulfonic acid and isoacrylphosphoric acid, and pay attention to control the rate of addition, the time of dropping potassium persulfate is controlled at about 1.5h, after the addition is completed, Continue the reaction for 5-6 hours to obtain a brownish-yellow transparent viscous liq...

Embodiment 2

[0019] The preparation method of 2-butene phosphoric acid and p-styrenesulfonic acid copolymer is as follows:

[0020] (1) Weigh 1 mole of p-styrenesulfonic acid, add 3 moles of deionized water, and stir in a water bath at 40-50°C until completely dissolved; (2) After the solution is cooled, pour it into Then add 0.4 mole of 2-butenyl phosphoric acid into the three-port reactor with reflux device, dropping funnel and thermometer, and turn on the electric stirring to make it dissolve evenly; heat slowly, and feed nitrogen gas for 15min, the temperature rises to 75°C and To keep stable, add H dropwise 2 o 2 , the dropping amount is about 10% of the total mass of p-styrenesulfonic acid and 2-butenyl phosphoric acid, and pay attention to controlling the dropping speed, and the time for dropping potassium persulfate is controlled at about 1.5h. After the dropping is completed, continue the reaction for 5- 6h, a brownish-yellow transparent viscous liquid is obtained; (3) Pour the ...

Embodiment 3

[0022] A kind of scale inhibitor and bactericide for oil field produced water, the preparation method is: take 30kg of the copolymer prepared in Example 1 and put it in a stirring container, add 10kg of PESA, mix evenly, then add 34.7kg of tap water, then add metronidazole 0.3kg, glutaraldehyde 5kg, and finally add 20kg of dodecyl dimethyl benzyl ammonium chloride, stir evenly to obtain the finished product of antiscalant and fungicide.

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PUM

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Abstract

The invention discloses an antiscalant and bactericide for oilfield produced water, which comprises the following components in mass percent: 30-40% copolymer of organophosphoric acid and p-styrenesulfonic acid containing carbon-carbon unsaturated bond structure, PESA 5- 15%, metronidazole 0.2-0.6%, glutaraldehyde 5-10%, alkyl quaternary ammonium salt 15-30%, and the rest is water, a total of 100%. The copolymer is formed by polymerization of organophosphoric acid with carbon-carbon unsaturated bond structure and p-styrene sulfonic acid under the action of an initiator at a reaction temperature of 70-80°C for 5-6 hours. Organic phosphoric acid is preferably isoacrylic phosphoric acid, and the molar ratio of isoacrylic phosphoric acid to p-styrenesulfonic acid is 0.4:1. Mix and stir the copolymer and PESA evenly, add tap water, then add metronidazole, glutaraldehyde, and alkyl quaternary ammonium salt in sequence, and stir evenly to obtain the finished scale inhibitor and fungicide. The antiscaling and bactericidal agent of the invention has the effects of both antiscaling and bactericidal, and is particularly effective on calcium sulfate and sulfate reducing bacteria.

Description

technical field [0001] The invention relates to the technical field of petroleum additives, in particular to a scale inhibitor and bactericide for oilfield produced water. Background technique [0002] In the process of oilfield development, scaling will inevitably occur in oil and gas wellbores, surface gathering and transportation systems, water injection formations, etc., which will not only block pipelines and reduce heat transfer efficiency, but may also cause serious under-scaling corrosion, which is harmful to oil and gas development. bring many security risks. Especially for the water injection process in low-permeability oilfields, scaling will reduce the output and injection capacity of oil and gas wells, resulting in increased water injection pressure and more likely to cause equipment damage. At the same time, especially the salinity of gas field water is relatively high, and the sulfate content is generally above 1g / L, which is very easy to generate calcium sul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14C02F103/10
CPCC02F5/14C02F2103/10
Inventor 曾德智刘振东程地奎喻智明
Owner SOUTHWEST PETROLEUM UNIV
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