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Carbon dioxide corrosion resistant cement paste in well cementation and preparation method thereof
The invention discloses carbon dioxide corrosion resistant cement paste in well cementation and a preparation method thereof. The CO2 corrosion resistant cement paste for well cementation is prepared from cement, nano SiO2, UF cellulose fibers, a fluid loss agent, a dispersing agent and water. The content of each component in 100 parts by mass of the cement is as follows: 0.5 to 2.5 percent of nano SiO2, 0.1 to 0.5 percent of UF cellulose fiber, 0.6 to 0.8 percent of fluid loss agent and 0.2 to 0.5 percent of dispersing agent; the liquid-solid ratio of the CO2 corrosion resistant cement paste is 0.44 to 0.50. Nanometer SiO2 is used for filling and plugging micropores in set cement, so that the compactness and strength of the set cement are improved, and meanwhile, the nanometer SiO2 can participate in a hydration reaction to improve Si/Ca of a hydration product, so that the corrosion resistance of the hydration product is improved; according to the invention, the UF cellulose fiber is utilized, has good dispersibility and affinity, and can improve the mechanical strength, especially the tensile strength, of the cement paste.
本发明公开了一种固井中抗二氧化碳腐蚀水泥浆及其制备方法。所述固井中抗CO2腐蚀水泥浆，由水泥、纳米SiO2、UF纤维素纤维、降失水剂、分散剂和水制成；100质量份的所述水泥中，各组分的含量如下：纳米SiO20.5～2.5％，UF纤维素纤维0.1～0.5％，降失水剂0.6～0.8％，分散剂0.2～0.5％；抗CO2腐蚀水泥浆的液固比为0.44～0.50。本发明利用纳米SiO2对水泥石内部的微孔隙起到充填堵孔作用，进而提高水泥石的致密性和强度，同时还可参与水化反应提高水化产物的Si/Ca，进而改善水化产物的抗腐蚀能力；本发明利用UF纤维素纤维，具有较好的分散性和亲和性，可以提高水泥浆的力学强度，尤其是抗拉强度。
Carbon dioxide corrosion resistant cement paste in well cementation and preparation method thereof
The invention discloses carbon dioxide corrosion resistant cement paste in well cementation and a preparation method thereof. The CO2 corrosion resistant cement paste for well cementation is prepared from cement, nano SiO2, UF cellulose fibers, a fluid loss agent, a dispersing agent and water. The content of each component in 100 parts by mass of the cement is as follows: 0.5 to 2.5 percent of nano SiO2, 0.1 to 0.5 percent of UF cellulose fiber, 0.6 to 0.8 percent of fluid loss agent and 0.2 to 0.5 percent of dispersing agent; the liquid-solid ratio of the CO2 corrosion resistant cement paste is 0.44 to 0.50. Nanometer SiO2 is used for filling and plugging micropores in set cement, so that the compactness and strength of the set cement are improved, and meanwhile, the nanometer SiO2 can participate in a hydration reaction to improve Si/Ca of a hydration product, so that the corrosion resistance of the hydration product is improved; according to the invention, the UF cellulose fiber is utilized, has good dispersibility and affinity, and can improve the mechanical strength, especially the tensile strength, of the cement paste.
本发明公开了一种固井中抗二氧化碳腐蚀水泥浆及其制备方法。所述固井中抗CO2腐蚀水泥浆，由水泥、纳米SiO2、UF纤维素纤维、降失水剂、分散剂和水制成；100质量份的所述水泥中，各组分的含量如下：纳米SiO20.5～2.5％，UF纤维素纤维0.1～0.5％，降失水剂0.6～0.8％，分散剂0.2～0.5％；抗CO2腐蚀水泥浆的液固比为0.44～0.50。本发明利用纳米SiO2对水泥石内部的微孔隙起到充填堵孔作用，进而提高水泥石的致密性和强度，同时还可参与水化反应提高水化产物的Si/Ca，进而改善水化产物的抗腐蚀能力；本发明利用UF纤维素纤维，具有较好的分散性和亲和性，可以提高水泥浆的力学强度，尤其是抗拉强度。
Carbon dioxide corrosion resistant cement paste in well cementation and preparation method thereof
一种固井中抗二氧化碳腐蚀水泥浆及其制备方法
FAN BAITAO (author) / WU GUANG'AI (author) / LI ZHONG (author) / WU ZHIQIANG (author) / XING XUESONG (author) / GUO HUA (author) / YIN ZHIMING (author) / YANG YUGUI (author) / ZHOU DINGZHAO (author) / YUE JIAPING (author)
2022-03-04
Patent
Electronic Resource
Chinese
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