Scale removing agent applicable to alkaline-surfactant-polymer flooding and scale removing and unfreezing process

A ternary compound and scale removal technology, which can be used in cleaning appliances, drilling compositions, wellbore/well components, etc., can solve problems such as poor effect, and achieve obvious economic benefits, fast scale dissolution speed, and obvious blockage removal. The effect of increasing production
CN102775973AActive Publication Date: 2012-11-14DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DAQING JINGSHENG WEIYE OILFIELD TECH SERVICE
Publication Date
2012-11-14

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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.
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Description

Technical field:

[0001] The invention relates to a scale remover in the field of oil recovery, in particular to a scale remover suitable for weak alkali three-element compound flooding, and also relates to a scale remover and jam-relieving process using the scale remover. Background technique:

[0002] In the field of oil recovery, the weak alkali ASP flooding technology has improved the traditional ASP flooding, replacing the strong alkali sodium hydroxide with weak alkali sodium carbonate, which greatly reduces the corrosion phenomenon of strong alkali on underground rocks and the damage to oil layers. Injury, precipitation and oil-increasing effect are remarkable. However, scaling features also appeared in the oil wells at the production end, mainly manifested as out-of-synchronization of pumping units, pump jamming, and increased number of pump inspections during operation, which seriously affected the normal production of oil wells.

[0003] Chemical descaling is the u...

Claims

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