Study and Application of a New Complex Plug Removal System

SHI Jin, HE Licheng, WANG Xiaoyu

Abstract


Aiming at solving small effective acid reaction range and causing second damage in the acidizing in low permeability reservoirs, a new kind of deep penetration and little damage complex plug removal system was developed through laboratory research, which consists of an organic acid, a phosphoric acid, an ammonium organic acid, an ammonium fluoride and a strong oxidizer. The properties were evaluated and the results indicate that it has advantages of proper dissolving capacity to rock with dissolving ratio of 38.9%, little corrosion to the pipeline of equipment with corrosion rate of 2.9 g/m2·h-1, low interfacial tension, anti-acid-sludge, and ability to stabilize ferric ion. The plugging in deep formations can be removed with low damage to rock skeleton, which the damage rate is less than 20%. It has been applied in 19 wells with success ratio of 100% and long term of validity, average validity is more than 200 days. The oil production and water injection have been increased obviously.
Key words: Acidization; Second damage; Complex plug removal system; Deep penetration; Rock skeleton

Keywords


Acidization; Second damage; Complex plug removal system; Deep penetration; Rock skeleton

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References


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DOI: http://dx.doi.org/10.3968/j.aped.1925543820130502.1173

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