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
CN113234427AInactive Publication Date: 2021-08-10DONGGUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGGUAN UNIV OF TECH
Publication Date
2021-08-10
Estimated Expiration
Not applicable · inactive patent

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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.
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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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