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Preparation method for quick cleaning and plug-removing disincrustant for oil well

A descaling agent, oil well technology, applied in chemical instruments and methods, cleaning appliances, earth-moving drilling, etc., can solve the problems of less than 30% market share, large differences in physical and chemical properties of scale, irregular crystals, etc., and achieve low production costs , use safety, use safety and environmental protection effect

Inactive Publication Date: 2019-07-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical cleaning is to use various mechanical external forces and energy to crush the dirt and peel it away from the object. This method has a certain effect, but due to its infancy, low efficiency and less than 30% of the market share, it has not been widely popularized.
It can be concluded that the scale of the oil well is formed by the simultaneous action of crystal precipitation and suspended impurity precipitation. Impurities and crystals precipitate at the same time. The use of scale crystals is not neat, resulting in a large difference between the physical and chemical properties of the scale and the theory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of oleyl-alcohol mixture: Add gasoline: 220g, condensate: 510g, kerosene: 80g, n-heptanol: 130g, Span-20: 20g, AEO-3: 15g, Twee-60: 25g, stirred and dissolved to obtain oleyl alcohol mixture;

[0024] (2) Preparation of emulsion A: In a high-speed disperser, add water: 580mL, oleyl-alcohol mixture described in step (1): 420mL, stir for 2.5 hours at a speed of 2000 rpm, and then increase the speed to 2800 rev / min, react for 50min, leave overnight to obtain A emulsion;

[0025] (3) Preparation of liquid B: into the reactor, add water: 750g, water-soluble ammonium polyphosphate: 80g, ammonium citrate: 120g, 1,2-cyclohexanediaminetetraacetic acid: 50g, stir and dissolve to obtain B liquid;

[0026] (4) Preparation of liquid C: Into the reactor, add water: 650g, itaconic acid: 100g, ethylenediamine: 50g, control the temperature at 45±2°C, stir, react for 60min, cool to room temperature, and then add Magnesium chloride: 100g, stirred and dissolved, added su...

Embodiment 2

[0028] (1) Preparation of oleyl-alcohol mixture: add separately to the reactor, gasoline: 20kg, condensate: 54kg, kerosene: 9kg, n-heptanol: 14kg, Span-20: 2kg, AEO-3: 0.8kg , Twee-60: 1.2kg, stirred and dissolved to obtain oleyl alcohol mixture;

[0029] (2) Preparation of emulsion A: In a high-speed disperser, add water: 55L, oleyl-alcohol mixture described in step (1): 45L, stir for 2.5 hours at a speed of 2000 rpm, and then increase the speed to 2800 rev / min, react for 50min, leave overnight to obtain A emulsion;

[0030] (3) Preparation of liquid B: into the reactor, add water: 72kg, water-soluble ammonium polyphosphate: 10kg, ammonium citrate: 14kg, 1,2-cyclohexanediaminetetraacetic acid: 4kg, stir and dissolve to obtain B liquid;

[0031] (4) Preparation of liquid C: Into the reactor, add water: 62kg, itaconic acid: 11kg, ethylenediamine: 5.5kg, control the temperature at 45±2°C, stir, react for 60min, cool to room temperature, and then Add magnesium chloride: 8kg, s...

Embodiment 3

[0033] (1) Preparation of oleyl-alcohol mixture: Add gasoline: 240g, condensate: 500g, kerosene: 00g, n-heptanol: 150g, Span-20: 20g, AEO-3: 16g, Twee-60: 24g, stirred and dissolved to obtain oleyl alcohol mixture;

[0034] (2) Preparation of emulsion A: In a high-speed disperser, add water: 600mL, oleyl-alcohol mixture described in step (1): 400mL, stir for 2.5 hours at a speed of 2000 rpm, and then increase the speed to 2800 rev / min, react for 50min, leave overnight to obtain A emulsion;

[0035] (3) Preparation of liquid B: into the reactor, add water: 780g, water-soluble ammonium polyphosphate: 60g, ammonium citrate: 100g, 1,2-cyclohexanediaminetetraacetic acid: 60g, stir and dissolve to obtain B liquid;

[0036](4) Preparation of liquid C: Into the reactor, add water: 680g, itaconic acid: 70g, ethylenediamine: 30g, control the temperature at 45±2°C, stir, react for 60min, cool to room temperature, and then add Magnesium chloride: 90g, stirred and dissolved, added succi...

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PUM

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Abstract

The invention discloses a preparation method for a quick cleaning and plug-removing disincrustant for an oil well. The preparation method is characterized by comprising the following steps: (1) preparing an emulsion A by a mixed liquid of water and oleyl alcohol in the presence of a surfactant; preparing a liquid B by the water, water-soluble ammonium polyphosphate, ammonium citrate and 1,2-cyclohexanediaminetetraacetic acid; preparing a liquid C by the water, itaconic acid, ethanediamine, magnesium chloride, butanedial, copper chloride, sucrose fatty acid ester and OP-10. The pH value of thequick cleaning and plug-removing disincrustant prepared by the invention is 6.0 and 7.5; both the cleaning agent and the cleaned waste liquid are neutral; acid mist cannot be generated; a steel equipment structure cannot be corroded, so that corrosion-free safe plug removing and descaling is realized; the plug-removing disincrustant can remove polymeric material scale and asphaltene scale of a rod pumped well and a screw pump well, and can also remove inorganic scale, such as calcium carbonate, magnesium carbonate, calcium sulphate and iron oxide; the plug-removing disincrustant is high in stability, is safe and environment-friendly to use, quick to remove plug, and suitable for popularization.

Description

technical field [0001] The invention relates to the field of chemical cleaning for oil production and descaling, in particular to a preparation method and application of a rapid cleaning and descaling agent for oil wells. Background technique [0002] At present, the cleaning process in my country can generally be divided into three types, chemical cleaning, physical cleaning and microbial cleaning. Chemical cleaning generally uses acid or lye, and is matched with active agents for cleaning. The formula is simple, highly corrosive, and harmful to equipment. Physical cleaning is to use various mechanical external forces and energy to crush the dirt and peel it away from the object. This method has a certain effect, but due to its infancy, low efficiency and less than 30% of the market share, it has not been widely popularized. Microbial cleaning is to use microorganisms to decompose the scale on the surface of the equipment. However, as a living organism, microorganisms live...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/528E21B37/06
CPCC09K8/524C09K8/528E21B37/06
Inventor 李慧芝张卫民许崇娟
Owner UNIV OF JINAN
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