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Method for preparing cleaning agent for eliminating downhole polymer micelle

A cleaning agent, polymer technology, applied in drilling compositions, chemical instruments and methods, cleaning utensils and other directions, can solve the problems of polluting the environment, difficult to remove, unsafe, etc., achieving simple preparation process, safe and environmentally friendly use, Good thermal stability

Inactive Publication Date: 2019-06-21
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to various reasons, polymer micelles - organic scales are formed. This kind of organic scales is difficult to remove by acid-base cleaning. Cleaning with organic solvents pollutes the environment, is expensive, and is unsafe.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of oleyl alcohol mixture: Add gasoline: 640g, diesel oil: 100g, n-butanol: 130g, octanol: 80g, AEO-3: 20g, Twee-20: 30g into the reactor, stir to dissolve , to obtain oleyl alcohol mixture;

[0024] (2) Preparation of Emulsion A: In a high-speed disperser, add water: 630g, oleyl-alcohol mixture described in step (1): 370g, stir for 1.5 hours at a speed of 1500 rpm, and then increase the speed to 2600 rev / min, react for 40min, leave overnight to obtain A emulsion;

[0025] (3) Preparation of liquid B: into the reactor, add water: 780g, water-soluble ammonium polyphosphate: 100g, ammonium chloride: 80g, triisopropanolamine: 40g, stir and dissolve to obtain liquid B;

[0026] (4) Preparation of liquid C: Into the reactor, add water: 750g, maleic acid: 80g, ethylenediamine: 40g, control the temperature at 65±2°C, stir, react for 60min, cool to room temperature, and then add Potassium chloride: 100g, stirred and dissolved, terephthalaldehyde: 30g, stirred a...

Embodiment 2

[0029] (1) Preparation of oleyl-alcohol mixture: add separately to the reactor, gasoline: 62kg, diesel: 12kg, n-butanol: 15kg, octanol: 6kg, AEO-3: 1.5kg, Twee-20: 2.5kg, Stir and dissolve to obtain an oleyl-alcohol mixture;

[0030] (2) Preparation of emulsion A: In a high-speed disperser, add water: 65kg, oleyl-alcohol mixture described in step (1): 35kg, stir for 1.5 hours at a speed of 1500 rpm, and then increase the speed to 2600 rev / min, react for 40min, leave overnight to obtain A emulsion;

[0031] (3) Preparation of liquid B: into the reactor, add water: 76kg, water-soluble ammonium polyphosphate: 12kg, ammonium chloride: 6kg, triisopropanolamine: 6kg, stir and dissolve to obtain liquid B;

[0032] (4) Preparation of liquid C: Into the reactor, add water: 72kg, maleic acid: 6kg, ethylenediamine: 6kg, control the temperature at 65±2°C, stir, react for 60min, cool to room temperature, and then add Potassium chloride: 12kg, stirred and dissolved, terephthalaldehyde: 4k...

Embodiment 3

[0035] (1) Preparation of oleyl alcohol mixture: Add gasoline: 630g, diesel oil: 80g, n-butanol: 120g, octanol: 100g, AEO-3: 25g, Twee-20: 40g into the reactor, stir to dissolve , to obtain oleyl alcohol mixture;

[0036] (2) Preparation of Emulsion A: In a high-speed disperser, add water: 620g, oleyl-alcohol mixture described in step (1): 380g, stir for 1.5 hours at a speed of 1500 rpm, and then increase the speed to 2600 rev / min, react for 40min, leave overnight to obtain A emulsion;

[0037] (3) Preparation of liquid B: into the reactor, add water: 800g, water-soluble ammonium polyphosphate: 80g, ammonium chloride: 70g, triisopropanolamine: 50g, stir and dissolve to obtain liquid B;

[0038] (4) Preparation of liquid C: into the reactor, add water: 780g, maleic acid: 70g, ethylenediamine: 30g, control the temperature at 65±2°C, stir, react for 60min, cool to room temperature, and then add Potassium chloride: 80g, stirred and dissolved, terephthalaldehyde: 50g, stirred and...

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Abstract

The invention discloses a method for preparing a cleaning agent for eliminating downhole polymer micelle. The method is characterized by comprising the following steps: preparing an emulsion A from amixed liquid of water and oleyl alcohol in the presence of a surfactant; preparing a liquid B from water, water-soluble ammonium polyphosphate, ammonium chloride and triisopropanolamine; preparing a liquid C from water, maleic acid, ethanediamine, potassium chloride and terephthalaldehyde; preparing a liquid D from water, sucrose ester, nonylphenol polyoxyethylene ether and lauryl sodium sulfate.The pH value of the neutral slow-speed unblocking descaling agent prepared by using the method is within 6.0-7.5; the cleaning agent and a waste cleaning liquid are both neutral, no acid mist is generated, ironic equipment structures are not corroded, and corrosion-free safe unblocking descaling can be achieved; the unblocking descaling agent is capable of both eliminating polymer material scale and asphaltene scale of a rod pumped well and a screw pump well, and eliminating inorganic scale such as calcium carbonate, magnesium carbonate, calcium sulfate and ferric oxide, is good in thermal stability, safe and environmentally friendly to use and applicable to popularization.

Description

technical field [0001] The invention relates to the field of chemical cleaning for oil field descaling and plugging removal, in particular to a preparation method and application of a cleaning agent for removing downhole polymer micelles. Background technique [0002] In the process of oilfield water flooding development, due to the incompatibility of foreign liquids with reservoir rock minerals and reservoir fluids, the existence of suspended substances, microorganisms and metabolites in water, and the precipitation of paraffin wax and asphalt colloids in crude oil, formation plugging is often caused. The water absorption capacity of the water injection well will decrease, the water injection pressure will increase, and the crude oil production will be affected. The causes and mechanism of blockages are summarized as follows: polymer adsorption and retention; incompatibility of polymer molecular weight and reservoir pore throat size; formation particle migration; bacteria a...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/536E21B37/06
Inventor 李慧芝许崇娟裴梅山
Owner UNIV OF JINAN
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