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Compound chemical blocking removing agent of oil field polymer injection well

A plugging agent and polymer injection well technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of oil well production reduction, pressure increase, injection volume reduction, etc., to restore permeability and unblock , modified dispersion and reduced viscosity effect

Active Publication Date: 2013-02-13
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems such as the decrease of injection volume, the increase of pressure and the decrease of oil well production caused by the clogging of polymer injection well encountered in the polymer injection flooding process of onshore and offshore oilfields, the present invention provides a more suitable onshore Composite chemical plugging agent for plugging of polymer injection wells in offshore oilfields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a beaker, take 50 g of anionic polyacrylamide gel with a concentration of 20,000 ppm and a viscosity greater than 10,000 cP, and prepare 1,000 g of a composite chemical plugging agent, which consists of:

[0039] 1% Cocamidopropyl Betaine;

[0040] 1% coconut oil fatty acid diethanolamine;

[0041] 1% sodium lignosulfonate;

[0042] 13.5% calcium peroxide;

[0043] 4.5% peroxy tert-butanol;

[0044] 43.2% 2,3-dihydroxysuccinic acid;

[0045] 21.6% fatty alcohol ether sulfosuccinic acid;

[0046] 0.1% OS-15;

[0047] 0.1%OP-10;

[0048] 1% cetyl alcohol polyoxyethylene ether;

[0049] 0.05% hydroxyethylidene diphosphonic acid;

[0050] 1.5% methacrylate zircoaluminate;

[0051] 1% citric acid;

[0052] 1% aminotriacetic acid;

[0053] 0.6% cetyltrimethylammonium chloride;

[0054] 0.55% 2-chloromethyl imidazoline hydrochloride;

[0055] 0.55% 1-N-hydroxyethyl-2-alkyl imidazoline quaternary ammonium salt;

[0056] The remainder is water;

[0057] Dissolv...

Embodiment 2

[0059] In a beaker, take 50 g of anionic polyacrylamide gel with a concentration of 20,000 ppm and a viscosity greater than 10,000 cP, and prepare 1,000 g of a composite chemical plugging agent, which consists of:

[0060] 2% Cocamidopropyl Betaine;

[0061] 2% coconut oil fatty acid diethanolamine;

[0062] 2% sodium lignosulfonate;

[0063] 27% calcium peroxide;

[0064] 9% peroxy tert-butanol;

[0065] 30% 2,3-dihydroxysuccinic acid;

[0066] 15% fatty alcohol ether sulfosuccinic acid;

[0067] 0.4% OS-15;

[0068] 0.4%OP-10;

[0069] 1.5% cetyl alcohol polyoxyethylene ether;

[0070] 0.10% hydroxyethylidene diphosphonic acid;

[0071] 0.05% aminobenzenesulfonate zirconium aluminate;

[0072] 1.5% citric acid;

[0073] 1.5% aminotriacetic acid;

[0074] 0.9% cetyltrimethylammonium chloride;

[0075] 0.9% 2-chloromethyl imidazoline hydrochloride;

[0076] 0.9% quaternary ammonium salt of 1-N-hydroxyethyl-2-alkyl imidazoline;

[0077] The remainder is water;

...

Embodiment 3

[0080] In a beaker, take 50 g of anionic polyacrylamide gel with a concentration of 20,000 ppm and a viscosity greater than 10,000 cP, and prepare 1,000 g of a composite chemical plugging agent, which consists of:

[0081] 1% Cocamidopropyl Betaine;

[0082] 1% coconut oil fatty acid diethanolamine;

[0083] 1% sodium lignosulfonate;

[0084] 15% calcium peroxide;

[0085] 5% peroxy tert-butanol;

[0086] 43.2% 2,3-dihydroxysuccinic acid;

[0087] 21.6% fatty alcohol ether sulfosuccinic acid;

[0088] 0.2% OS-15;

[0089] 0.2%OP-10;

[0090] 1.2% cetyl alcohol polyoxyethylene ether;

[0091] 0.07% hydroxyethylidene diphosphonic acid;

[0092] 1.2% methacrylate zircoaluminate;

[0093] 1.5% citric acid;

[0094] 1.5% aminotriacetic acid

[0095] 0.7% cetyltrimethylammonium chloride;

[0096] 0.8% 2-chloromethyl imidazoline hydrochloride;

[0097] 0.8% 1-N-hydroxyethyl-2-alkyl imidazoline quaternary ammonium salt;

[0098] The remainder is water;

[0099] Dissolve...

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Abstract

The invention relates to a compound chemical blocking removing agent of an oil field polymer injection well. The compound chemical blocking removing agent is characterized in that a high molecular extending agent with strong electronegativity is used for hydrating and extending condensed and agglomerated polymer macromolecule chains again; peroxide is used as a primary oxidation agent; polybasic carboxylic acid which can slowly and uniformly ionize hydrogen ions is used as controlled-release acid; auxiliary agents such as a corrosion inhibitor, a penetrant, a metal ion chelating agent, a dual-metal coupling agent, an iron ion stabilizer, a bacteriacide, a stratum protective agent, and the like are added at the same time; and macromolecular polymers in blocking substances, which are near the oil field polymer injection well, and are fully extended by the extending agent, are oxidized and degraded by active hydroxyl which is produced from the reaction of the primary oxidation agent and the controlled-release acid, so that blocking of the polymer injection well is removed, and the apparent water injectivity index is improved. The chemical blocking removing agent is non-toxic and environment-friendly, has a wide applicable range of temperature and water quality, and has the advantages of simplicity in construction technique, safety and convenience in use and storage, and the like; and the viscosity-reducing rate of the compound chemical blocking removing agent to polyacrylamide gel can reach above 99%.

Description

technical field [0001] The invention belongs to the technical field of increasing production and injection of oil-water wells in the petroleum industry, and relates to a composite chemical plugging removal agent for polymer injection wells in oil fields, which can also be used as a formula chemical for removing plugging wells in offshore oil fields. Background technique [0002] In recent years, with the continuous shortage of world energy and the continuous development of the petroleum industry, tertiary oil recovery technology has gradually attracted people's attention and made significant progress. Polymer flooding is characterized by its simple technology, large range of enhanced oil recovery and economic benefits. It has become one of the tertiary oil recovery methods with the most development potential both at home and abroad. Since the 1960s, polymer flooding tests have been carried out in more than 200 oil fields or blocks around the world, and polymer flooding techn...

Claims

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Application Information

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IPC IPC(8): C09K8/524
Inventor 赵迎秋靳晓霞滕厚开马元威卢大艳吴威张延旭
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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