FLUIDO NAO PREJUDICIAL DE ALTA ESTABILIDADE PARA MANTER UMA PRESSAO HIDROSTATICA EM UMA FORMACAO SUBTERRANEA,PROCESSO PARA CONTROLAR A PRESSAO HIDROSTATICA EM UM POCO E PROCESSO PARA PREPARAR TAL FLUIDO

摘要

A high stability, nondamaging spacer fluid is provided containing readily available weighting agents such as calcium carbonate and iron carbonate dispersed in water using a polymer viscosifier, a salt inhibitor, a primary sulfonated dispersant and a secondary fatty acid amide dispersion. Conventional high density weighting agents can also be used. The spacer fluid is stable over a temperature range of about 32 DEG -300 DEG F for extended periods with densities ranging from 11 to 17.6 pounds per gallon.