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Synthesis method of active supramolecular scale dissolving agent and application of synthesis method

A synthetic method and supramolecular technology, applied in chemical instruments and methods, dissolution, earth drilling and mining, etc., can solve the problem of high cost of acid-base neutralization in residual liquid treatment, corrosion of strong alkaline scale dissolver equipment, heterocyclic complexes, etc. The mixture is harmful to the environment, etc., to achieve the effect of increasing the scale dissolution rate, reducing environmental damage, and reducing treatment costs

Active Publication Date: 2020-08-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide an active supramolecular scale-dissolving agent for barium-strontium scale, improve the scale-dissolving speed under static conditions, increase the scale-dissolving rate, and solve the problem of severe corrosion of equipment caused by strong alkaline scale-dissolving agent and acid-base treatment of residual liquid. Technical problems such as high cost of neutralization and high environmental hazards of heterocyclic complexing agents

Method used

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  • Synthesis method of active supramolecular scale dissolving agent and application of synthesis method
  • Synthesis method of active supramolecular scale dissolving agent and application of synthesis method
  • Synthesis method of active supramolecular scale dissolving agent and application of synthesis method

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preparation example Construction

[0024] A method for synthesizing an active supramolecular scale dissolver, comprising the steps of:

[0025] Add organic amine, dihaloalkane, phase transfer agent, solvent and pH regulator to the reaction vessel, wherein, in molar ratio, organic amine:dihaloalkane:phase transfer agent=(2.2-2.3):1:(0.03-0.07 ); the mass ratio of organic amine, dihaloalkane, phase transfer agent to the mass of the solvent is =1:(1-1.2); adding a pH regulator to adjust the pH value of the reaction system to 9-9.5; warming up to 85 ° C ~ 90 °C, after stirring and reacting for 22h to 24h, an active supramolecular scale dissolving agent is obtained.

[0026] The organic amines include sodium ethylenediaminetetraacetate, sodium diethylenetriaminepentaacetate and heptasodium diethylenetriaminepentamethylenephosphonate.

[0027]The dihaloalkanes include 1,6-dichlorohexane, 1,8-dichlorooctane, 1,10-dichlorodecane and 1,10-dibromodecane.

[0028] The phase transfer agent includes tetrabutylammonium bro...

Embodiment 1

[0038] Add sodium edetate, 1,10-dichlorodecane, tetrabutylammonium bromide, water and pH regulator Na to the three-necked flask 2 EDTA, wherein, reactant and phase transfer agent and pH adjuster molar ratio are sodium edetate: 1,10-dichlorodecane: tetrabutylammonium bromide: Na 2 EDTA=2.2:1:0.05:0.08, heat up to 87°C, stir and react for 22 hours to obtain an active supramolecular barium strontium scale dissolver.

[0039]

Embodiment 2

[0041] Add sodium diethylenetriaminepentaacetate, 1,10-dibromodecane, 12 alkyl dimethyl betaine, water and pH regulator EDTA into the three-necked flask, wherein the reactant and phase transfer agent and pH regulator The molar ratio of the agent is sodium diethylenetriaminepentaacetate: 1,10-dibromodecane: 12 alkyl dimethyl betaine: EDTA = 2.3: 1: 0.04: 0.04, heat up to 85 ° C ~ 90 ° C, stir the reaction After 24 hours, an active supramolecular barium strontium scale dissolver was obtained.

[0042]

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Abstract

The invention discloses a synthesis method of an active supramolecular scale dissolving agent. The method comprises the following steps that: organic amine, dihaloalkane, a phase transfer agent, a solvent and a pH regulator are added into a reaction vessel, the molar ratio of the organic amine, the dihaloalkane and the phase transfer agent is (2.2-2.3): 1: (0.03-0.07); the mass ratio of the mass sum of the organic amine, the dihaloalkane and the phase transfer agent to the mass of the solvent is 1: (1-1.2); the pH regulator is added to regulate the pH value of a reaction system to 9-9.5; and temperature rises to 85-90 DEG C, and stirring is performed to react for 22-24 hours, so that the active supramolecular scale dissolving agent can be obtained. The active supramolecular scale dissolving agent is suitable for dissolving and removing barium-strontium scale of oilfield gathering and transportation pipelines, and the barium-strontium scale and calcium carbonate scale of water flooding,gas flooding, chemical flooding injection-production layers, increases the scale dissolving rate of insoluble scale such as barium-strontium scale, reduces the corrosion of common strong-basicity scale dissolving agents to equipment, reduces residual liquid treatment cost and environmental damage , and improves comprehensive benefits.

Description

technical field [0001] The invention relates to the technical field of oil recovery and gas recovery engineering in the petroleum industry, in particular to a synthesis method and application of an active supramolecular scale-dissolving agent. Background technique [0002] The development of oil and gas fields has entered the middle and later stages, and the application of technologies such as water injection and tertiary oil recovery has caused serious scaling problems in oil fields. Oilfield scaling types include carbonate scale (CaC0 3 ), sulfate scale (CaS0 4 , BaS0 4 , SrS0 4 ) and iron scale, etc., and form mixed scale with each other. Scaling will occur in formations, wellbores, equipment and surface systems, etc., thereby blocking oil and gas pores and channels, resulting in reduced permeability, reduced oil and gas production, increased energy consumption and corrosion under scale, seriously affecting the normal production of oil fields and reducing production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/18C07C229/16B01F17/18B01F17/28C09K8/584C09K8/528C09K8/68E21B37/06C09K23/18C09K23/28
CPCC07C227/18C09K8/584C09K8/528C09K8/68C09K8/86E21B37/06C09K23/00C07C229/16
Inventor 虞建业王彪包敏新
Owner CHINA PETROLEUM & CHEM CORP