A kind of low density oil well cement
An oil well cement, low-density technology, applied in the field of oil and gas well cementing, can solve the problems of insufficient early strength and short thickening time, and achieve the effect of improving stability and ensuring cementing quality.
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Embodiment 1
[0031] A low-density oil well cement, composed of the following raw materials by mass percentage: 87.15% sulfoaluminate cement clinker, 6% anhydrite, 6% hollow glass microspheres, 0.1% dispersant CFR-H, 0.75% citric acid , the water-cement ratio is 0.50.
[0032] In the present embodiment, the specific surface area of gypsum is 462cm 2 / g, index of glass beads 0.5g / cm 3 , The specific surface area of sulphoaluminate cement clinker is 520cm 2 / g, anhydrous calcium sulfoaluminate C 4 A 3 The content is 57%.
Embodiment 2
[0034] A low-density oil well cement, composed of the following raw materials by mass percentage: 85% sulfoaluminate cement clinker, 4.2% anhydrite, 10% hollow glass microspheres, 0.3% dispersant FDN, 0.5% borax, water ash The ratio is 0.40.
[0035] In the present embodiment, the specific surface area of gypsum is 450cm 2 / g, index of glass beads 0.3g / cm 3 , The specific surface area of sulphoaluminate cement clinker is 470cm 2 / g, anhydrous calcium sulfoaluminate C 4 A 3 Content 60%.
Embodiment 3
[0037] A low-density oil well cement, composed of the following raw materials by mass percentage: sulfoaluminate cement clinker 84.6%, anhydrite 10%, hollow glass microspheres 5%, dispersant FDN 0.1%, citric acid 0.3%, water The gray ratio was 0.46.
[0038] In the present embodiment, the specific surface area of gypsum is 473cm 2 / g, index of glass beads 0.5g / cm 3 , The specific surface area of sulphoaluminate cement clinker is 500cm 2 / g, anhydrous calcium sulfoaluminate C 4 A 3 Content 55%.
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