| 摘要 |
A water insoluble material consisting of porous particles, preferably of glass, is used as a light weight filling substance additive for a cement slurry of the kind used in cementing operations within bore holes, especially oil and gas wells, for the main purpose of letting the porous glass particles accommodate water prior to the material's admixture into the cement slurry or subsequent to this admixture, so that extra water is held in readiness within the cement slurry admixed said filling substance. The cement slurry will then, upon hydration and deficiency of water, be able to absorb extra water from the pores of the porous particles, thus counteracting the cement slurry's liability to shrinkage. |
