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Solid slow-release scale inhibitor and preparation method thereof

A slow-release antiscalant technology, applied in chemical instruments and methods, earthwork drilling, scale removal and water softening, etc., can solve the problems of short action period, corrosivity of wellbore, high cost, etc., to prolong the action period, The effect of reducing oil production cost and reducing scale cleaning cycle

Active Publication Date: 2020-04-14
NORTHEAST GASOLINEEUM UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The present invention provides a solid slow-release scale inhibitor and a preparation method thereof in order to solve the problems that the existing scale inhibitor has certain corrosiveness to the wellbore, the action period is short, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Mix the monomers neopentyl glycol dioleate, vinyl acetate, hydroxypropyl acrylate and maleic anhydride in a molar ratio of 0.002:1.2:1:2, and add ammonium persulfate of 0.5% of the total mass of the monomers and water of 200% of the total mass of monomers (monomers include neopentyl glycol dioleate, vinyl acetate, hydroxypropyl acrylate and maleic anhydride), heated to 75°C, reacted for 8 hours, and purified the product with ethanol. The resulting tetrapolymer was vacuum dried at 50°C.

[0023] Then put 10g of attapulgite into 100ml concentration of 12% glucose solution for hydrothermal reaction at 180°C for 5 hours to obtain carbonized attapulgite, then pass carbonized attapulgite through 15% NaOH aqueous solution and 20% citric acid aqueous solution successively, in At 30°C, vacuum-dry the obtained organic attapulgite at 50°C after soaking for 2.5 hours respectively.

[0024] Finally, the tetrapolymer, polyvinyl alcohol and organic attapulgite were mixed according to...

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Abstract

The invention discloses a solid slow-release scale inhibitor and a preparation method thereof, and belongs to the technical field of oilfield auxiliary agents. A purpose of the invention is to solve the problems of a certain corrosivity to wellbore, short action period, high cost and the like of the scale inhibitor. According to the method, a quadripolymer is subjected to blending modification with organic attapulgite to obtain a solid slow-release scale inhibitor capable of effectively inhibiting formation and deposition of wellbore scale in an oil extraction process, greatly reducing the regular scale removal period of a wellbore, reducing the oil extraction cost and ensuring the safe and stable operation of an oil well. According to the invention, organic nano-clay is applied to the solid slow-release scale inhibitor, so that the stability and the mechanical strength of the solid slow-release scale inhibitor can be effectively improved, and the action period of the solid slow-release scale inhibitor is effectively prolonged.

Description

technical field [0001] The invention relates to a solid slow-release scale inhibitor and a preparation method thereof, belonging to the technical field of oilfield additives. Background technique [0002] The existing methods for controlling oilfield water scaling can be mainly divided into chemical methods and physical methods. Chemical methods include ion exchange softening method, lime softening method, acid addition method, introduction of CO 2 method, adding antiscalant method, physical methods include membrane method, electrostatic water treatment, electronic water treatment, use of plastic heat exchangers, etc. Compared with the physical method, the chemical method, especially the method of adding scale inhibitor, has the advantages of less investment, simple feeding, and good effect. [0003] The currently used ones are usually liquid scale inhibitors of organophosphoric acid, polymeric carboxylic acid and polymeric phosphate composite system. However, this type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C09K8/54C09K8/528C02F103/10
CPCC02F5/105C02F2103/10C02F2303/08C02F2303/22C09K8/528C09K8/54C09K2208/32
Inventor 孙征楠荆国林刘洋张惠波郭凯
Owner NORTHEAST GASOLINEEUM UNIV
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