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A scale removal agent and scale removal process suitable for weak alkali ASP flooding

A ternary composite and scale cleaning technology, which is applied to cleaning appliances, drilling compositions, wellbore/well components, etc., can solve problems such as poor effect, and achieve obvious economic benefits, low corrosion, and obvious scale cleaning effect. Effect

Active Publication Date: 2014-10-29
DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at overcoming the problem in the background technology that the conventional chemical cleaning effect of weak alkali ASP flooding wells is poor, and provides a scale remover suitable for weak alkali ASP flooding

Method used

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  • A scale removal agent and scale removal process suitable for weak alkali ASP flooding
  • A scale removal agent and scale removal process suitable for weak alkali ASP flooding
  • A scale removal agent and scale removal process suitable for weak alkali ASP flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 9g of hydrochloric acid, 1g of hydrofluoric acid, 2g of glacial acetic acid, 1.0g of corrosion inhibitor, 0.5g of triethanolamine, 2.0g of ammonium chloride, 0.2g of alkylphenol polyoxyethylene ether, and 84.3g of water to prepare a scale cleaner. .

Embodiment 2

[0027] Weigh 10g of hydrochloric acid, 2g of hydrofluoric acid, 2g of glacial acetic acid, 1.0g of corrosion inhibitor, 1.0g of triethanolamine, 2.0g of ammonium chloride, 0.2g of alkylphenol polyoxyethylene ether and 81.8g of water to prepare a scale cleaner. .

Embodiment 3

[0029] Weigh 9.6g of hydrochloric acid, 1.4g of hydrofluoric acid, 2g of glacial acetic acid, 1.0g of corrosion inhibitor, 0.7g of triethanolamine, 2.0g of ammonium chloride, 0.2g of alkylphenol polyoxyethylene ether and 83.1g of water and mix to prepare a clear solution. Scale agent.

[0030] Evaluation of the performance of the scale cleaner suitable for weak alkaline ASP flooding:

[0031] ⑴Scaling performance

[0032] At the oil layer temperature, the dissolution rate of the scale cleaning agent on the scale samples in weak alkali oil wells can reach more than 95%. The scale removal effect of the scale cleaning agent on the ternary oil well scale samples is shown in Table 1.

[0033] Table 1 The effect of scale cleaning agent on the scale sample of ternary oil well

[0034]

[0035] ⑵The peeling effect of scale

[0036] Scanning electron microscope was used to observe the characteristics of the scale before soaking in the penetrant solution and after 24h soaking, and visually descri...

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Abstract

The invention relates to a scale removing agent applicable to alkaline-surfactant-polymer flooding and a scale removing and unfreezing process, and mainly solves the problems that the effect is poor when an alkaline-surfactant-polymer flooding oil well adopts conventional chemical scale removal. The scale removing agent is characterized by consisting of the following components in proportions according to weight percent: 9-10% of hydrochloric acid, 1-2% of hydrofluoric acid, 2% of glacial acetic acid, 1.0% of corrosion inhibitor, 0.5-1.0% of triethanolamine, 2.0% of ammonium chloride, 0.2% of penetrating agent and 79-84.3% of water. The scale removing and unfreezing process comprises the following steps: 1) adopting a pump truck for backwashing a production well with hot water at a wellhead of the production well, wherein the water temperature is 50-80 DEG C and the liquid quantity is 20m<3>; 2) injecting 8-10m<3> of scale removing agent into a wellhole from a casing gate and then adopting replacing and squeezing liquid for replacing the scale removing agent in the wellhole into a waste liquid tank truck; and 3) starting a pumping unit to recover the normal production of the oil well. The scale removing agent applicable to alkaline-surfactant-polymer flooding is low in corrosivity and safe to use.

Description

Technical field: [0001] The invention relates to a scale cleaning agent in the field of oil production, in particular to a scale cleaning agent suitable for weak alkali ternary combined flooding. The invention also relates to a scale cleaning and jam releasing process using the scale cleaning agent. Background technique: [0002] In the field of oil production, the weak alkaline ternary combination flooding technology has improved the traditional ternary combination flooding, replacing the strong alkaline sodium hydroxide with weak alkaline sodium carbonate, which greatly reduces the strong alkali’s dissolution of underground rocks and the impact on oil layers. Damage, precipitation and oil increase effect is significant. However, fouling characteristics also appeared in the oil wells at the production end, which were mainly manifested as unsynchronized pumping units, stuck pumps, and increased number of pump inspections, which seriously affected the normal production of oil well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52E21B37/06
Inventor 徐超孟令喜
Owner DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE
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