| 摘要 |
FIELD: oil and gas industry. ^ SUBSTANCE: invention refers to boring of oil and gas wells and can be employed at their cementing. A spreading additive contains shale ashes and additionally a water solvent reagent containing "Krep" and carboxy-methyl cellulose at the ratio of 1.68:1.0 or "Krep" and tri-butyl phosphate at the ratio of 4.3:1.0, or "Krep" and nitrile-trimethyl-phosphonic acid at the ratio of 11.0:1.0, or plasticiser C-3 and sulfacell at the ratio of (4.3-7.8):1.0 at the following ratio of components, wt %: shale ashes 83.3-98.4, the said reagent 1.6-16.7. ^ EFFECT: control over backfill material spreading, improved characteristics of material spreading, bending and compressing hardness of cement stone and period of cement thickening. ^ 1 tbl, 7 ex |
