Oilfield chemical scale inhibitor, preparation method and application thereof

An anti-scaling agent and chemical technology, applied in the direction of chemical instruments and methods, descaling and water softening, special treatment goals, etc., can solve the problem of narrow adaptability range of temperature and PH value, low anti-scaling efficiency of anti-scaling agent, and difficult to meet the on-site requirements Demand and other issues, to achieve the effect of small environmental impact, good temperature resistance, excellent anti-scaling effect

Active Publication Date: 2020-12-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The enzyme used in the bio-blockage remover can degrade the blockage caused by the polymer. It needs to cooperate with acid or other solvents to remove inorganic or organic scale. need
[0006] The anti-scaling efficiency of the existin

Method used

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  • Oilfield chemical scale inhibitor, preparation method and application thereof
  • Oilfield chemical scale inhibitor, preparation method and application thereof

Examples

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Embodiment 1

[0042]This embodiment provides an oilfield chemical antiscaling agent, comprising the following parts by weight: 75 parts of nitrogen-containing organic polyphosphonic acid, 15 parts of sodium polyepoxysuccinate, 5 parts of chelating dispersant, and 5 parts of water.

[0043] The preparation process of oilfield chemical antiscaling agent:

[0044] Under normal temperature and pressure, add the water of formula quantity in reaction kettle, then add the chelating dispersant of formula quantity, after stirring and dissolving, add the sodium polyepoxysuccinate of formula quantity and nitrogen-containing organic polyphosphonic acid successively, stir until Dissolve completely, that is.

[0045] Among them, the nitrogen-containing organic polyphosphonic acid is a mixture of tetrasodium aminotrimethylene phosphonate and sodium ethylenediamine tetramethylene phosphonate, and the mass ratio of the two is (6.3-6.7): (0.8-1.2).

[0046] Nitrogen-containing organic polyphosphonic acid ad...

Embodiment 2

[0054] This example provides an oilfield chemical antiscaling agent, comprising 70 parts of nitrogen-containing organic polyphosphonic acid, 14 parts of sodium polyepoxysuccinate, 3 parts of chelating dispersant, and 3 parts of water.

[0055] The preparation process of oilfield chemical antiscaling agent:

[0056] Under normal temperature and pressure, add the water of formula quantity in reaction kettle, then add the chelating dispersant of formula quantity, after stirring and dissolving, add the sodium polyepoxysuccinate of formula quantity and nitrogen-containing organic polyphosphonic acid successively, stir until Dissolve completely, that is.

[0057] Wherein, the nitrogen-containing organic polyphosphonic acid is a mixture of tetrasodium aminotrimethylene phosphonate and sodium ethylenediamine tetramethylene phosphonate, and the mass ratio of the two is 6.3:1.2. The solid content of sodium polyepoxysuccinate was 35.52wt%. The chelating dispersant is a maleic acid-acry...

Embodiment 3

[0061] This embodiment provides an oilfield chemical antiscaling agent, which includes the following raw materials in parts by weight: 80 parts of nitrogen-containing organic polyphosphonic acid, 16 parts of sodium polyepoxysuccinate, 7 parts of chelating dispersant, and 7 parts of water.

[0062] The preparation process of oilfield chemical antiscaling agent:

[0063] Under normal temperature and pressure, add the water of formula quantity in reaction kettle, then add the chelating dispersant of formula quantity, after stirring and dissolving, add the sodium polyepoxysuccinate of formula quantity and nitrogen-containing organic polyphosphonic acid successively, stir until Dissolve completely, that is.

[0064] In this embodiment, the nitrogen-containing organic polyphosphonic acid is a mixture of tetrasodium aminotrimethylene phosphonate and sodium ethylenediamine tetramethylene phosphonate, and the mass ratio of the two is 6.7:0.8. The solid content of sodium polyepoxysucci...

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Abstract

The invention provides an oilfield chemical scale inhibitor, a preparation method and application thereof. The oilfield chemical scale inhibitor is prepared from the following substances by weight: 70-80 parts of nitrogen-containing organic polybasic phosphonic acid, 14-16 parts of sodium polyepoxysuccinate, 3-7 parts of a chelating dispersant and 3-7 parts of water. According to the invention, the sodium polyepoxysuccinate, the chelating dispersant and the nitrogen-containing organic polybasic phosphonic acid in a specific raw material ratio are used as the main raw material components, and all the components cooperate with one another, so that almost no corrosion is caused to a pipeline, no toxicity is caused, the temperature resistance is good, the influence on the environment is small,the use is safe, and scaling is prevented after injected water and oil-layer water are mixed; the scale inhibition rate of calcium carbonate scale is greater than 90%, the scale inhibition rate of barium sulfate scale is greater than 90%, the corrosion rate of injected water is reduced to slow down tubular column corrosion, the corrosion rate of a brass test piece is not greater than 0.0011mm/a,and the requirements of large property difference and continuous change of the injected water of an oil field water injection system can be met.

Description

technical field [0001] The invention belongs to the technical field of chemical antiscaling agents, and in particular relates to an oil field chemical antiscaling agent and its preparation method and application. Background technique [0002] In the process of oil field development, in order to maintain the formation pressure and increase the recovery rate, water injection development is the most economical production process. In the early stage, the produced fluid contains little water, and clean water is often injected; in the middle and later stages, the water content in the produced fluid increases, and the injected water is mostly re-injected into the formation with oilfield sewage dehydrated and treated by the combined station. [0003] As the water cut of the oil well increases, the injected water advances, causing serious fouling of the production well string, downhole equipment, surface pipelines and equipment. Scaling generally exists in oil well shafts, oil and g...

Claims

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Application Information

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IPC IPC(8): C02F5/14C02F103/10
CPCC02F5/14C02F2103/10C02F2303/08
Inventor 刘爱华周志平李琼玮苑慧莹刘宁姜毅董俊杨会丽
Owner PETROCHINA CO LTD
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