| 摘要 |
oil and gas production. SUBSTANCE: mortar consisting of cement and mixing fluid in particular contains, as mixing fluid, formation water containing up to 0.15% magnesium chloride, 2-4% calcium chloride, and 4-8% sodium chloride. Owing to joint use of calcium and sodium chlorides plus simultaneous at least tenfold decrease in concentration of magnesium ions, mechanical strength of cement stone increases as well as sealing capacity, adhesion to casing pipes and well walls. Another advantage is decreased magnesia corrosion. EFFECT: improved characteristics of cement stone. 3 tbl
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