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Barium scale inhibitor for alkaline-surfactant-polymer flooding oil well

A technology of ternary compound and anti-scaling agent, which is applied in the field of oilfield anti-scaling, and can solve the problems of large amount of scaling, complex scale components, and serious scaling of ASP flooding wells, etc.

Active Publication Date: 2013-11-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] ASP flooding wells have severe scaling, mainly manifested as: large amount of scaling and fast scaling; complex and diverse scale components; the production fluid of ASP flooding is high It also contains complex components such as polymers, oils, alkalis and surfactants, which makes it difficult to effectively prevent scales with conventional antiscalants
However, there is no anti-scaling agent that can effectively prevent the high content of barium scale in ASP flooding wells.

Method used

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  • Barium scale inhibitor for alkaline-surfactant-polymer flooding oil well
  • Barium scale inhibitor for alkaline-surfactant-polymer flooding oil well
  • Barium scale inhibitor for alkaline-surfactant-polymer flooding oil well

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0046] Add 235g deionized water into a 2L four-necked flask with a volume of reflux and dripping device, heat and stir until the deionized water reaches the boiling point, and then add the following raw materials dropwise: 530g 53% sodium acrylate aqueous solution, 163.0g 40% 3 -Allyloxy-1,2-dihydroxypropane aqueous solution, 120.5g of 50% aqueous solution of sodium methylvinylbenzenesulfonate, 74.5g of 15% sodium persulfate solution as the initiator of the reaction, drop within 2 hours Finish. After the dropwise addition operation was completed, the original reaction temperature was maintained for 30 minutes, and a pale yellow transparent liquid was obtained after the reaction was completed. The molecular weight of the obtained copolymer was determined to be 4500 to 4600 by gel permeation chromatography. Figure 4 It is the nuclear magnetic resonance H spectrum of the copolymer antiscalant prepared in this preparation example 1.

preparation example 2

[0048] Add 235 grams of deionized water in a 2L four-necked flask with a reflux and dripping device, heat and stir until the deionized water reaches the boiling point, and then add the following raw materials dropwise: 608 grams of 53% by weight sodium methacrylate aqueous solution, 197.6 grams 40% by weight of 3-allyloxy-1,2-dimethylolpropane in water, 112.8 grams of 50% by weight of sodium vinylbenzenesulfonate in water, 74.5 grams of 15% sodium persulfate solution as the initiator of the reaction , Dropping is completed within 2 hours. After the dropping operation is completed, the original reaction temperature is maintained for 30 minutes, and a light yellow transparent liquid is obtained at the end of the reaction. The molecular weight of the obtained copolymer was determined to be 4500 to 4800 by gel permeation chromatography.

preparation example 3

[0050] Add 235 grams of deionized water to a 2L four-necked flask with a reflux and dripping device, heat and stir until the deionized water reaches the boiling point, and then add the following raw materials dropwise: 530 grams of 53% by weight sodium acrylate aqueous solution, 145.0 grams of 40% by weight % 3-allyloxy-1,2-dihydroxyethane in water, 93.6 grams of 50% by weight sodium methylvinylsulfate in water, 74.5 grams of 15% sodium persulfate solution as the initiator of the reaction, 2 hours After the internal drop is completed, after the dropping operation is completed, the original reaction temperature is maintained for 30 minutes, and a light yellow transparent liquid is obtained after the reaction is completed. The molecular weight of the obtained copolymer was determined to be 4300 to 4600 by gel permeation chromatography.

[0051] Test Example 1, Determination of Antiscalant Corrosion Rate

[0052] Use the N80 steel sheet as the test piece, measure the size of the...

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Abstract

The invention belongs to the field of oil field scale inhibition and relates to barium scale inhibitor for an alkaline-surfactant-polymer flooding oil well. The barium scale inhibitor consists of a monomer A, a monomer B and a monomer C which are copolymerized, wherein the monomer A is allyl ether monomer, the monomer B is alkyl acrylate, and the monomer C is alkyl vinyl benzene sulfonate. The barium scale inhibitor can be used for scale inhibition for strong-alkali ternary composite driving block exploration well, effectively inhibiting scales formed on pumps, rod pipes and the like, and operating times are reduced so that pump checking period of the exploration well is prolonged.

Description

technical field [0001] The invention belongs to the field of oilfield scale prevention, and relates to an antiscale agent used in the field of oil recovery, in particular to an antiscale agent used for barium scale in three-element compound oil flooding wells. Background technique [0002] Pilot industrial field tests of ASP flooding in the oil field show that the recovery rate can be increased by 20 percentage points compared with water flooding. The ASP flooding technology will be an important means to further enhance the oil recovery in the late stage of high water cut in the oilfield. However, the ASP flooding technology has a serious oil well scaling problem. Due to scaling, oil well operations are frequent, and the pump inspection cycle is reduced from 599 days in water flooding to 60 days. In severe cases, the pump inspection cycle is only about 30 days. This not only increases the production cost, but also greatly reduces the production time rate. [0003] ASP floo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06
Inventor 程杰成王鑫王庆国丁小孔衔霄
Owner PETROCHINA CO LTD