A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cement paste system and preparation method thereof
The invention provides a cement paste system. The cement paste system comprises the following components: cement (G-grade high-sulfate-resistance oil well cement), a large-temperature-difference retarder, a large-temperature-difference fluid loss agent, a high-temperature-resistance elastic material, a high-temperature-resistance toughening material, a high-temperature expanding agent, a high-temperature strength stabilizing material, a weighting agent, an early strength agent, a dispersing agent and water. The density of the cement paste system can reach 1.8-2.15 g/cm<3>, and the thickening time can be adjusted and controlled within 150-500 min. The top cement paste can be prevented from being subjected to super retarding by virtue of the large-temperature-difference retarder and the large-temperature-difference fluid loss agent. By means of the high-temperature-resistant elastic material and the high-temperature toughening material, the mechanical property of set cement can be improved, and the sealing property of a cement sheath is improved. The requirements that the well bottom temperature is not higher than 140 DEG C, the temperature difference between the top and the bottom of the sealing section is not larger than 80 DEG C, the 72-hour strength of the top set cement is larger than 14 MPa, and the elastic modulus of the set cement is smaller than 8 GPa can be met.
本发明提供了一种水泥浆体系，其组分包括：水泥(G级高抗硫酸盐型油井水泥)、大温差缓凝剂、大温差降失水剂、抗高温弹性材料、抗高温增韧材料、高温膨胀剂、高温强度稳定材料、加重剂、早强剂、分散剂和水；所述水泥浆体系的密度可达1.8至2.15g/cm3，稠化时间150至500min可调可控。其依托大温差缓凝剂和大温差降失水剂可防止顶部水泥浆超缓凝；依托抗高温弹性材料与高温增韧材料可改善水泥石力学性能，提高水泥环密封性能。能够满足井底温度不高于140℃，封固段顶底温差不大于80℃时，顶部水泥石72h强度大于14MPa，水泥石弹性模量小于8GPa的要求。
Cement paste system and preparation method thereof
The invention provides a cement paste system. The cement paste system comprises the following components: cement (G-grade high-sulfate-resistance oil well cement), a large-temperature-difference retarder, a large-temperature-difference fluid loss agent, a high-temperature-resistance elastic material, a high-temperature-resistance toughening material, a high-temperature expanding agent, a high-temperature strength stabilizing material, a weighting agent, an early strength agent, a dispersing agent and water. The density of the cement paste system can reach 1.8-2.15 g/cm<3>, and the thickening time can be adjusted and controlled within 150-500 min. The top cement paste can be prevented from being subjected to super retarding by virtue of the large-temperature-difference retarder and the large-temperature-difference fluid loss agent. By means of the high-temperature-resistant elastic material and the high-temperature toughening material, the mechanical property of set cement can be improved, and the sealing property of a cement sheath is improved. The requirements that the well bottom temperature is not higher than 140 DEG C, the temperature difference between the top and the bottom of the sealing section is not larger than 80 DEG C, the 72-hour strength of the top set cement is larger than 14 MPa, and the elastic modulus of the set cement is smaller than 8 GPa can be met.
本发明提供了一种水泥浆体系，其组分包括：水泥(G级高抗硫酸盐型油井水泥)、大温差缓凝剂、大温差降失水剂、抗高温弹性材料、抗高温增韧材料、高温膨胀剂、高温强度稳定材料、加重剂、早强剂、分散剂和水；所述水泥浆体系的密度可达1.8至2.15g/cm3，稠化时间150至500min可调可控。其依托大温差缓凝剂和大温差降失水剂可防止顶部水泥浆超缓凝；依托抗高温弹性材料与高温增韧材料可改善水泥石力学性能，提高水泥环密封性能。能够满足井底温度不高于140℃，封固段顶底温差不大于80℃时，顶部水泥石72h强度大于14MPa，水泥石弹性模量小于8GPa的要求。
Cement paste system and preparation method thereof
一种水泥浆体系及其制备方法
ZHAO HAIYANG (author) / YI HAO (author) / ZHANG JUN (author) / LI SHUANGGUI (author) / LUO FAQIANG (author) / JIA XIAOBIN (author) / HE YINGZHUANG (author) / LU FEIFEI (author) / LI FEI (author) / LIU XIAOMIN (author)
2021-02-02
Patent
Electronic Resource
Chinese
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