Nova Patents
NO20030159L

Compositions for controlling scaling and completion fluids

Abstract

An aqueous-based composition containing cesium formate and at least one chelating agent is described. Methods of removing scaling deposits, which may include alkaline earth metal sulfates, present on surfaces, including porous media, such as alkaline earth metal sulfate buildup in a well bore, is also described, wherein the method includes contacting the alkaline earth metal sulfate with the compositions of the present invention to remove the scaling deposits. A completion fluid containing at least one alkali metal formate, at least one acid and/or at least one chelating agent, and optionally at least one surfactant or mutual solvent is also described. Methods of removing a filter cake from a well bore surface, which may include weighting agents such as calcium carbonate, is also described, wherein the method includes contacting the filter cake with the completion fluid of the present invention.

Term

No projected expiry on record.

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1 claim: 1 independent, 0 dependent

  1. 1
    jordalkalimetallsulfatet i kontakt med blandingene for å fjerne de avsatte belegg. Fremgangsmåter for å fjerne filterkaken, som kan innbefatte et vektmiddel som kalsiumkarbonat, fra overflater i et brønnhull innbefatter å bringe filterkaken i kontakt med en kompletteringsvæske inneholdende minst ett alkalimetallformiat, minst én syre og/eller minst ett chelateringsmiddel, og eventuelt minst én surfaktant eller et egnet løsningsmiddel.