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Composite antiscale agent

A technology of anti-scaling agent and surfactant, which is applied in the field of composite anti-scaling agent, and can solve the problems of blockage of gathering pipelines and heating furnaces, decline of oil well liquid production, and scrapping.

Inactive Publication Date: 2011-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the occurrence of scaling, the fluid production of oil wells decreases and frequent workover operations are caused. In severe cases, oil wells are shut down or scrapped, and gathering pipelines and heating furnaces are blocked.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First, in a capacity of 1000 liters of enamel reaction kettle, add quantitative water, add the ethylene glycol butyl ether solvent that the weight content is 2%, stir evenly, add the tensio-active agent (perfluorononoxybenzenesulfonate) of weight 1.0% Sodium acid), stirring and dissolving completely, and then adding organic phosphonic acid (hydroxyethylidene diphosphonic acid and phosphinotrialkyltricarboxylic acid) with a weight content of 21.0% in sequence (the compound ratio is 1: 2), and the weight content is 18% The polycarboxylic acid (hydrolyzed polymaleic anhydride), the balance is water, stir evenly, both obtained this product.

[0015] The composite anti-scaling agent is used in anti-scaling construction of scaled oil wells or in cooperation with fracturing and acidification. When used, generally, the dosage of a single well is 2-5 tons, the mass concentration is 2-6%, and the effective period of anti-scaling is more than 2 years.

Embodiment 2

[0017] First in a capacity of 1000 liters of enamel reaction kettle, add quantitative water, add weight content is 2% ethylene glycol butyl ether solvent, stir evenly, add weight 1.2% tensio-active agent (perfluorononoxybenzene sulfonate Sodium acid), stirring and dissolving completely, and then adding organic phosphonic acid (hydroxyethylidene diphosphonic acid and phosphinotrialkyltricarboxylic acid) with a weight content of 24.0% in sequence (the compound ratio is 1: 2), and the weight content is 15% The polycarboxylic acid (maleic acid-acrylic acid copolymer), the balance is water, stirs evenly, both obtains this product.

[0018] The composite anti-scaling agent is used in anti-scaling construction of scaled oil wells or in cooperation with fracturing and acidification. Generally, the dosage for a single well is 2-5 tons, the concentration is 2-6%, and the effective period of anti-scaling is more than 2 years.

Embodiment 3

[0020] First in a capacity of 1000 liters of enamel reaction kettle, add quantitative water, add weight content is 2% ethylene glycol butyl ether solvent, stir evenly, add weight 1.2% tensio-active agent (perfluorononoxybenzene sulfonate Sodium acid sodium), stir and dissolve completely, then add the organic phosphonic acid (aminotrimethylene phosphonic acid) of 20.0% by weight and the polycarboxylic acid (maleic acid-acrylic acid-AMPS copolymer) of 20% by weight successively, the balance For water, stir evenly to obtain the product.

[0021] The composite anti-scaling agent is used in anti-scaling construction of scaled oil wells or in cooperation with fracturing and acidification. Generally, the dosage for a single well is 2-5 tons, the concentration is 2-6%, and the effective period of anti-scaling is more than 2 years.

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PUM

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Abstract

The invention relates to a composite antiscale agent. The composite antiscale agent comprises the following components in percentage by weight: (a) 10.0 to 20 percent of organic phosphonate, (b) 10.0 to 20 percent of polycarboxylic acid and (c) 2.0 to 10 percent of surfactant. The composite antiscale agent is used for performing antiscale construction or / and cooperating with pressing crack and acidization on a scaling oil well, wherein the common using amount of the composite antiscale agent for a single well is 2 to 5 tons; and the using concentration is 2 to 6 percent. Due to the adsorption of the composite antiscale agent on the surface of formation sandstone, the precipitation capacity is high; the release rate is moderate; the antiscale property is high; when the concentration of the composite antiscale agent is 20 mg / L, the antiscale efficiency on calcium carbonate (CaCO3) and barium sulfate (BaSO4) reaches 90 percent; when the concentration of the composite antiscale agent is 0.1 percent, the interfacial tension of the composite antiscale agent and crude oil reaches 32.7 mN / m; the antiscale useful life exceeds 2 years; and the total effective rate is 93.9 percent.

Description

Technical field: [0001] The invention relates to a composite antiscaling agent, which belongs to the fields of prolonging the inspection period of oil well pumps and protecting oil layers near the bottom of oil wells in petroleum development. Background technique [0002] During oil field development, due to the thermodynamic instability and chemical incompatibility of water, carbonates of calcium and magnesium, and sulfates of barium, strontium and calcium are often produced near the bottom of the oil well, downhole and on pipeline equipment Wait for salt scaling. Due to the occurrence of scaling, the fluid production of oil wells decreases and frequent workover operations are caused. In severe cases, oil wells are shut down or scrapped, and gathering pipelines and heating furnaces are blocked. [0003] In order to prevent scaling, injecting anti-scaling agent into the formation near the bottom of the well is a simple and practical method. The general injection process is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
Inventor 高春宁武平仓王小琳吕晓玲
Owner PETROCHINA CO LTD
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