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Slow-release solid salt inhibitor

A slow-release, solid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of frequent feeding, rapid drug activity failure, limited income, etc., to reduce feeding times, inhibit wellbore salt deposition, simple craftsmanship

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional salt inhibitors also have the following obvious defects: poor temperature resistance, short effective period, rapid loss of drug activity at high temperatures, limited benefits, and failure to achieve the expected salt inhibitory effect; frequent feeding, many liquid salt inhibitors 12 hours after the completion of dosing, the content of salt inhibitors that can be monitored is greatly reduced. A considerable number of wells with salt accumulation have just recovered their production capacity, and then salt formation occurs again. Frequent dosing of chemicals during emergency gas recovery will inevitably seriously affect gas production.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0051] Weigh 100g of sodium ferrocyanide and dissolve it in a polyacrylic acid solution with a concentration of 30%, heat it in a water bath at 90 degrees and stir well, then add 10g of gelatin and stir and mix evenly again, wherein sodium ferrocyanide, gelatin and polyacrylic acid Acrylic acid accounts for 29.9%, 3%, and 59.7% of the total weight of the salt suppressant particles respectively. After mixing evenly for 1 hour, stop heating, and when it is cooled to about 70 degrees, use a spherical mold with a diameter of 2 cm to extrude and granulate, and cool to room temperature to obtain the core of the salt inhibitor particle.

[0052]Immerse the core of the salt suppressant particle in the modified urea-formaldehyde resin binder for 1 minute and take it out to obtain the particle with the binder on the surface. Mix the granules containing the adhesive on the surface with the coating material and add them to the evaporator, and distill at a temperature of 50°C for 90 minute...

Embodiment 2

[0054] Weigh 100g of sodium ferrocyanide and dissolve it in a polyacrylic acid solution with a concentration of 30%, heat it in a water bath at 90 degrees and stir well, then add 10g of gelatin and stir and mix evenly again, wherein sodium ferrocyanide, gelatin and polyacrylic acid Accounting for 29.9%, 3%, and 59.7% of the total weight of salt suppressant granules respectively. After mixing evenly for 1 hour, stop heating, and when it is cooled to about 70 degrees, use a spherical mold with a diameter of 2 cm to extrude and granulate, and cool to room temperature to obtain the core of the salt inhibitor particle.

[0055] Immerse the core of the salt suppressant particle in the modified urea-formaldehyde resin binder for 1 minute and take it out to obtain the particle with the binder on the surface. Mix the granules containing the adhesive on the surface with the coating material and add them to the evaporator, and distill at a temperature of 50°C for 90 minutes. The above-m...

Embodiment 3

[0057] Weigh 100g of sodium ferrocyanide and dissolve it in a polyacrylic acid solution with a concentration of 30%, heat it in a water bath at 90 degrees and stir well, then add 10g of gelatin and stir and mix evenly again, wherein sodium ferrocyanide, gelatin and polyacrylic acid They account for 30.4%, 3%, and 60.8% of the total weight of salt suppressant granules, respectively. After mixing evenly for 1 hour, stop heating, and when it is cooled to about 70 degrees, use a spherical mold with a diameter of 2 cm to extrude and granulate, and cool to room temperature to obtain the core of the salt inhibitor particle.

[0058] Immerse the core of the salt suppressant particle in the modified urea-formaldehyde resin binder for 1 minute and take it out to obtain the particle with the binder on the surface. Mix the granules containing the adhesive on the surface with the coating material and add them to the evaporator, and distill at a temperature of 50°C for 90 minutes. The abov...

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Abstract

The invention discloses a slow-release type solid salt inhibitor, which comprises a salt inhibitor particle core, and the salt inhibitor particle core comprises ferrocyanide, polyacrylic acid and gelatin; the outer layer coating material comprises polyphosphate, starch, modified urea-formaldehyde resin and a urea-formaldehyde resin curing agent.

Description

technical field [0001] The invention relates to a solid granular agent for effectively inhibiting the crystallization of sodium chloride for a long period of time, and is mainly used in high-salinity formation water oil and gas fields and gas storages where wellbore salt formation occurs. Background technique [0002] For gas fields with high formation water salinity, in the later stage of development, as the formation pressure decreases, the saturated water content in the natural gas increases, causing a large amount of formation water to evaporate, and wellbore salt formation is common. For gas storages with depleted gas reservoirs in high-salinity formations, the cumulative evaporation of formation water increases gradually after multi-cycle injection and production, which will inevitably aggravate the occurrence of salt formation and salt plugging. Especially in the emergency gas production stage in winter, with the increase of gas production, the pressure drops sharply,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/536
CPCC09K8/528C09K8/536
Inventor 陈亚姝翟羽佳何祖清伊伟锴孙鹏罗燕艾爽李晓益吴俊霞
Owner CHINA PETROLEUM & CHEM CORP
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