FIELD: chemistry.
SUBSTANCE: group of inventions relates to cement systems, in particular to cement systems which are in contact with drilling fluids in an underground well. Method of cementing an underground well involves placing a cement mortar containing water, hydraulic cement, oil-absorbing particles and non-swelling hydrophobic fibres inside the underground well. Said hydrophobic fibres have length between 500 mcm and 20 mm and diameter between 100 nm and 1 mm. Oil-absorbing particles are elongated and have the aspect ratio between 15 and 1000 before swelling, and between 5 and 350 after swelling, and contact with the non-aqueous component of the drilling mud inside the underground well and reduce the fluidity of the non-aqueous component of the drilling mud.
EFFECT: higher quality of well cementing.
15 cl, 8 dwg, 5 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| CEMENT COMPOSITIONS AND METHODS | 2019 |
|
RU2796015C2 |
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|
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|
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| LOW-PERMEABLE SYSTEMS OF CEMENT FOR FIELD OF APPLICATION OF WATER VAPOUR INJECTION | 2007 |
|
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