SLAG CEMENT AND PROCESS USING HYDROPHOBICALLY MODIFIED GALACTOMANNANS AS FILTRATE REDUCTANTS

摘要

This invention concerns a process for controlling filtration loss during the installation of slag cement in a well. The procedure entails the addition of a specific quantity of at least a derivative of galactomannan, hydrophilically and hydrophobically modified. In one version, the derivative is hydrophobically modified hydroxy propyl guar (HMHPG). This invention concerns slag cement and a filtrate reductant additive containing a specific quantity of at least a derivative of galactomannan, hydrophilically and hydrophobically modified.