Liquid toughening leakage-blocking agent for well cementation

The invention relates to a liquid toughening leakage-blocking agent for well cementation. The liquid toughening leakage-blocking agent comprises a novel fiber material which is formed by stacking sheet graphite microcrystalline organic fiber along its axial direction, and a microcrystalline graphite material is obtained by carbonizing and graphitizing. The liquid toughening leakage-blocking agentcan reduce set cement microcrack and block macrocrack expansion, so that resistance to wear, cavitation erosion, scouring and freeze-thawing and anti-permeability can be improved to different degrees;rate of an erosion medium in invading a matrix is lowered, and gas channeling and oil channeling are prevented effectively. 本发明涉及一种固井用液体增韧堵漏剂，包括新型纤维材料，所述新型纤维材料由片状石墨微晶有机纤维沿纤维轴向方向堆砌而成，经碳化及石墨化处理而得到的微晶石墨材料。本发明可减少水泥石微裂缝和阻止宏观裂缝扩展，故可使其耐磨性、耐空蚀、耐冲刷性、抗冻融性和抗渗性有不同程度提高；使侵蚀介质侵入基体的速率降低，有效防止了气窜和油窜的发生。