Cementing slurry and method of designing a formulation

摘要

The present invention provides a cementing composition for an oil or analogous well, essentially constituted by a solid fraction suspended in a liquid medium. The solid fraction is constituted by a coarse fraction with a packing volume fraction &PHgr;.sub.1 which, according to the invention, is maximised, and a fines fraction x with a packing volume fraction &PHgr;.sub.2 which is less than or equal to the volume fraction x. sub.0 such that ##EQU1## The invention also provides a method of maximising the value of &PHgr;.sub.1. The invention can minimise fluid loss whatever the materials selected for a cementing composition.