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Synthesis method and application of active supramolecular scale dissolving agent

A synthetic method and supramolecular technology, applied in chemical instruments and methods, dissolution, earth square drilling, etc., can solve the environmental hazards of heterocyclic complexing agents, high cost of acid-base neutralization in residual liquid treatment, and strong alkalinity Solve problems such as corrosion of scale dissolving agent equipment, achieve the effect of increasing scale dissolution rate, reducing damage to the environment, and reducing treatment costs

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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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 method for synthesizing an active supramolecular scale-dissolving agent, which comprises adding organic amine, dihaloalkane, phase transfer agent, solvent and pH regulator into a reaction vessel, in terms of molar ratio, organic amine:dihaloalkane:phase transfer Agent=(2.2-2.3): 1: (0.03-0.07); The mass ratio of the sum of organic amine, dihaloalkane, phase transfer agent mass and solvent is=1:(1-1.2); Add pH regulator to adjust reaction system The pH value reaches 9-9.5; the temperature is raised to 85°C-90°C, and after stirring and reacting for 22h-24h, an active supramolecular scale-dissolving agent is obtained. The invention is suitable for dissolving and removing barium-strontium scale in oilfield gathering and transportation pipelines, water flooding, gas flooding, and chemical flooding injection-production layer barium-strontium scale and calcium carbonate scale, improves the rate of refractory scales such as barium-strontium scale, and reduces general strong alkali The corrosion of the equipment by the non-toxic scale dissolver reduces the cost of residual liquid treatment and the damage to the environment, and improves the overall benefit.

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