Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Low-density early-strength anti-channeling cement paste for ocean well cementation and preparation method thereof
The invention discloses low-density early-strength anti-channeling cement paste for ocean well cementation and a preparation method thereof. The cement paste comprises low-temperature early-strength cement, a lightening agent, an early-strength stabilizer, a mineral enhancer, an anti-channeling agent, a fluid loss agent, a dispersing agent, a defoaming agent and water. Wherein the low-temperature early-strength cement is formed by mixing cement with tricalcium silicate, tricalcium aluminate, dicalcium silicate, dihydrate gypsum and tetra calcium aluminoferrite; the early strength stabilizer is prepared from modified nano mesoporous molecular sieve powder, nano metakaolin and superfine silicon dioxide; the modified nano mesoporous molecular sieve is prepared by carrying out exchange modification on metal cations in a mixed solution of aluminum chloride and zirconium nitrate and cations in an MCM-48 mesoporous molecular sieve in a template agent exchange mode, and then carrying out adsorption modification through triethanolamine. The cement paste has the advantages of being good in rheological property, small in water loss, short in thickening time and the like, the compressive strength of set cement of the cement paste is higher than 10 MPa after the cement paste is cured for 12 h at the temperature of 10 DEG C, the strength of the cement paste is larger than or equal to 16 MPa after 24 h, the permeability of the set cement is smaller than 0.02 mD, the preparation method is simple, and conditions are easy to control.
本发明公开了一种海洋固井用低密度早强防窜水泥浆及其制备方法，包括低温早强水泥、减轻剂、早强稳定剂、矿物增强剂、防窜剂、降失水剂、分散剂、消泡剂和水；其中，低温早强水泥由在水泥中混合有硅酸三钙，铝酸三钙，硅酸二钙，二水石膏和铁铝酸四钙形成；早强稳定剂由改性纳米介孔分子筛粉末、纳米偏高岭土和超细二氧化硅构成；改性纳米介孔分子筛采用模板剂交方式将氯化铝和硝酸锆混合溶液中的金属阳离子与MCM‑48介孔分子筛中的阳离子进行交换改性，再经三乙醇胺进行吸附改性制备而成；该水泥浆具有流变性能好、失水小、稠化时间短等优点，其水泥石在10℃养护12h抗压强度均高于10MPa，24h强度≥16MPa，水泥石渗透率＜0.02mD，且制备方法简单，条件易控制。
Low-density early-strength anti-channeling cement paste for ocean well cementation and preparation method thereof
The invention discloses low-density early-strength anti-channeling cement paste for ocean well cementation and a preparation method thereof. The cement paste comprises low-temperature early-strength cement, a lightening agent, an early-strength stabilizer, a mineral enhancer, an anti-channeling agent, a fluid loss agent, a dispersing agent, a defoaming agent and water. Wherein the low-temperature early-strength cement is formed by mixing cement with tricalcium silicate, tricalcium aluminate, dicalcium silicate, dihydrate gypsum and tetra calcium aluminoferrite; the early strength stabilizer is prepared from modified nano mesoporous molecular sieve powder, nano metakaolin and superfine silicon dioxide; the modified nano mesoporous molecular sieve is prepared by carrying out exchange modification on metal cations in a mixed solution of aluminum chloride and zirconium nitrate and cations in an MCM-48 mesoporous molecular sieve in a template agent exchange mode, and then carrying out adsorption modification through triethanolamine. The cement paste has the advantages of being good in rheological property, small in water loss, short in thickening time and the like, the compressive strength of set cement of the cement paste is higher than 10 MPa after the cement paste is cured for 12 h at the temperature of 10 DEG C, the strength of the cement paste is larger than or equal to 16 MPa after 24 h, the permeability of the set cement is smaller than 0.02 mD, the preparation method is simple, and conditions are easy to control.
本发明公开了一种海洋固井用低密度早强防窜水泥浆及其制备方法，包括低温早强水泥、减轻剂、早强稳定剂、矿物增强剂、防窜剂、降失水剂、分散剂、消泡剂和水；其中，低温早强水泥由在水泥中混合有硅酸三钙，铝酸三钙，硅酸二钙，二水石膏和铁铝酸四钙形成；早强稳定剂由改性纳米介孔分子筛粉末、纳米偏高岭土和超细二氧化硅构成；改性纳米介孔分子筛采用模板剂交方式将氯化铝和硝酸锆混合溶液中的金属阳离子与MCM‑48介孔分子筛中的阳离子进行交换改性，再经三乙醇胺进行吸附改性制备而成；该水泥浆具有流变性能好、失水小、稠化时间短等优点，其水泥石在10℃养护12h抗压强度均高于10MPa，24h强度≥16MPa，水泥石渗透率＜0.02mD，且制备方法简单，条件易控制。
Low-density early-strength anti-channeling cement paste for ocean well cementation and preparation method thereof
海洋固井用低密度早强防窜水泥浆及其制备方法
QI BEN (Autor:in) / MA RURAN (Autor:in) / LIU WENMING (Autor:in) / WU CHAOMING (Autor:in) / YAN ZHENFENG (Autor:in) / ZONG YONG (Autor:in) / LING YONG (Autor:in) / LI XIAOLIN (Autor:in) / ZHU YU (Autor:in)
17.05.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
Anti-channeling anti-erosion well cementation cement paste
| Europäisches Patentamt | 2023
Low-density cement paste for well cementation and preparation method thereof
| Europäisches Patentamt | 2023
CCUS well cementation cement paste and preparation method thereof
| Europäisches Patentamt | 2024