Oil field acidification plug removal system based on deep eutectic solvent

A deep eutectic solvent and system technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low solubility, complex process, clogging of formations, etc. The effect of blocking removal efficiency

Inactive Publication Date: 2021-08-10
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that the process is complex and the solubility is low
Organic acid-hydrofluoric acid system is easy to cause secondary pollution
Phosphoric acid-hydrofluoric acid system can effectively inhibit the formation of calcium fluoride precipitation, but it is easy to form fluorosilicate precipitation, which can block the formation

Method used

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  • Oil field acidification plug removal system based on deep eutectic solvent
  • Oil field acidification plug removal system based on deep eutectic solvent
  • Oil field acidification plug removal system based on deep eutectic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of a novel plugging removal system based on a deep eutectic solvent, comprising the following process steps:

[0030] (1) Design and synthesis of deep eutectic solvents

[0031] Take choline chloride as hydrogen bond acceptor (HBA), p-toluenesulfonic acid as hydrogen bond donor (HBD); hydrogen bond acceptor and hydrogen bond donor in a certain ratio (HBA total molar number: HBD total Mole number = 1:1) mixed in a round bottom flask and heated in an oil bath at 80°C. After the mixture formed a transparent and uniform liquid, continue heating and stirring at 80°C for 4 hours to obtain a deep eutectic solvent for later use.

[0032] (2) Compounding of deep eutectic solvent with anti-scaling agent, hydrochloric acid and lithium fluoride

[0033] The antiscaling agent is prepared by mixing the following raw materials in the following molar fractions: 9 parts of hexamethylenetetramine, 9 parts of sodium D-gluconate, 9 parts of sodium polyepoxysuccinate,...

Embodiment 2

[0039] A preparation method of a novel plugging removal system based on a deep eutectic solvent, comprising the following process steps:

[0040] (1) Design and synthesis of deep eutectic solvents

[0041] Take choline proline as hydrogen bond acceptor (HBA), citric acid as hydrogen bond donor (HBD); Hydrogen bond acceptor and hydrogen bond donor are in a certain ratio (HBA total moles: HBD total moles Number = 1:2) mixed in a round bottom flask, heated in an oil bath at 100°C. After the mixture forms a transparent and uniform liquid, continue heating and stirring at 100°C for 8 hours to obtain a deep eutectic solvent, which is set aside.

[0042] (2) Compounding of deep eutectic solvent with anti-scaling agent, hydrochloric acid and lithium fluoride

[0043] The antiscaling agent is prepared by mixing the following raw materials according to the following molar fractions: 10 parts of hexamethylenetetramine, 10 parts of sodium D-gluconate, 10 parts of sodium polyepoxysuccina...

Embodiment 3

[0049] A preparation method of a novel plugging removal system based on a deep eutectic solvent, comprising the following process steps:

[0050] (1) Design and synthesis of deep eutectic solvents

[0051] Take 1-butyl-3-methylimidazole as hydrogen bond acceptor (HBA), p-toluenesulfonic acid as hydrogen bond donor (HBD); Total moles: total moles of HBD = 1:4) mixed in a round bottom flask, heated in an oil bath at 120°C. After the mixture formed a transparent and homogeneous liquid, continue heating and stirring at 120°C for 12 hours to obtain a deep eutectic solvent for later use.

[0052] (2) Compounding of deep eutectic solvent with anti-scaling agent, hydrochloric acid and lithium fluoride

[0053] The antiscaling agent is prepared by mixing the following raw materials according to the following molar fractions: 11 parts of hexamethylenetetramine, 11 parts of sodium D-gluconate, 11 parts of sodium polyepoxysuccinate, 11 parts of polyaspartic acid, 9 parts of sodium ethy...

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Abstract

The invention provides an acidification plug removal system based on a deep eutectic solvent. Specifically, the scale inhibitor is obtained by mixing the following raw materials in parts by mole: 9 to 11 parts of hexamethylenetetramine, 9 to 11 parts of D-sodium gluconate, 9 to 11 parts of sodium polyepoxysuccinate, 9 to 11 parts of polyaspartic acid, 7 to 9 parts of sodium ethylenediamine tetramethylene phosphonate, 6 to 9 parts of ethanol, 4 to 6 parts of rhamnolipid, 4 to 6 parts of benzotriazole and 4 to 7 parts of MA-AA polymer. The scale inhibitor, hydrochloric acid and villiaumite are mixed according to the total mole number ratio of 1: (2-4): (1-2) to form a solute, then the solute formed by mixing the scale inhibitor and the villiaumite is dissolved in a deep eutectic solvent, the novel plug removal system is obtained, and the total mole number ratio of the deep eutectic solvent to the solute formed by the villiaumite, the hydrochloric acid and the scale inhibitor is (0.01-0.5): 1. The deep eutectic solvent can control the strong acidity of hydrochloric acid, delay the intense reaction effect of a rock stratum and an acid liquid system, fully exert the solvent effect of the deep eutectic solvent, reduce the generation of precipitates and improve the plug removal efficiency.

Description

technical field [0001] The invention relates to the technical field of oilfield production increase and plugging removal, in particular to an oilfield acidification plugging removal system based on a deep eutectic solvent. Background technique [0002] For low-permeability oil layers, the porosity of formations can be increased through acidification plugging removal technology, the permeability of oil layers can be increased, and the production of oil wells can be increased. Due to the high shale content and dense cementation in the reservoir, there are a large amount of clastic clay minerals such as montmorillonite, montmorillonite, and smectite / smectite, which are easy to hydrate and expand, cause particle migration, block pores, and reduce permeability And affect the effect of acidification and plugging removal. Therefore, removing the clay minerals in the reservoir through appropriate technical methods and improving the physical properties of the reservoir can greatly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 李长平蔡学琴李琢王玉伟
Owner DONGGUAN UNIV OF TECH
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