An aqueous spacer composition compatible with drilling muds and cement slurries including saline slurries and application thereof to drilling oil and gas wells

摘要

The bases preferred of the spacer according to the invention comprise a biopolymer of the type produced by azotobacter indicus, a polymer styrenic or toluene - styrenic sulfone is a continuation of the top and a dispersing agent; this base is free of solid particles. The final composition of the spacer also contains an increase in weight (barite) and water. Total background [0002] with sludge and or cements sales or not and however excellent properties of the control of the filtrate, rheologie and placed in suspension. / p & & p & a surfactant enables a background [0002] with the mud to the oil.